bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mathematical modeling of the properties of thermal insulation materials based on hollow ceramic microspheres and phenylon
Authors: Smirnov K V , Yu Chukhlanov V , Smirnova N N 
Published: December 2021

Abstract
In this work, the creation of heat-insulating materials that are still operable at temperatures up to + 400 °C and have increased physical and mechanical characteristics was studied. This aim was achieved by using a heat-resistant polymer binder phenylon (an aromatic polyamide) and hollow ceramic microspheres, that were used as a filler. Phenylon was produced by OJSC «Polimersintez» in Vladimir. Hollow ceramic microspheres are the floating fractions of flue emissions from solid-fuel thermal power plants. Thermal insulation materials were made by mixing hollow ceramic microspheres with a phenylon solution in dimethylacetamide to the state of «wet sand». Then, the obtained substance was molded the solvent residues were removed. Furthermore, the main properties of the obtained materials were also studied. It was established that the thermal insulation material is characterized by high strength characteristics, has significant resistance to impact loads and is operable at temperatures up to 400 °C The developed thermal insulation materials are intended to be used in the construction of objects operating under the conditions of cyclic exposure to high temperatures (for example, power plants) and in the construction of objects operating under the conditions of cyclic exposure to high temperatures (for example, power facilities).
Investigation of physical and chemical properties, performance and behavior in fire conditions of epoxy compositions modified with inhibitory fillers
Authors: Totskiy D , Borisova V , Davidenko A , Kadochnikova E , Loran N 
Published: December 2021

Abstract
The presented article presents the results of investigations of operational characteristics and thermal stability of polymer composites whose matrix is represented by epoxy resins modified with different kinds of inhibiting fillers. An analytical literature review has been performed, methods and methods of obtaining flame retardant composites have been studied. Experimental study of the influence of inhibiting modifiers - fine fillers: iron oxide, silica flour, graphite, talcum, copper oxide has been carried out. According to the results of the experimental study, the modification of the epoxy matrix of the composite by the introduction of inhibiting fillers by ultrasonic treatment contributes to an increase in thermal stability. The modified material is characterized by decrease of intensity of destruction of the material matrix, expressed in decrease of mass loss level, decrease of maximum value of thermal effect, increase of oxidation period, and also steady formation of a thermal insulating carbonaceous layer.
Physical chemical analysis of polymeric substances synthesized from monomers in heavy pyrolysis oil
Authors: Burkhev F , Kushiev H , Juraev T 
Published: December 2021

Abstract
Our article describes in the results of the research the polymerization of the residual (brown tint) after the separation of useful cabocylic compounds (indene) from the composition of one of the important fractions of heavy pyrolysis oil (indene and its homologues), which are considered to be a brownish product formed on the basis of natural gas pyrolysis, and the molecular mass and physical chemical. As a result of the analysis of the infrared (IR), it was known that the product contains functional groups (-C=C-) with a polymerizing property, along with an aromatic ring, and the polymer is made up of a mixture of isomers of polyvinyl toluene. The molecular mass of the polymer (MM) in the viscometric method was determined as the best solvent of benzene in the process of maturation, the macromolecular mass and the degree of polymerization (p) were determined as a result of the studies conducted.
Evaluation of the durability of mastic deck covering based on polymer composites in the range of operating stresses and temperatures
Authors: Burmistrov E , Burmistrova A , Tikhomirov A , Bimberekov P 
Published: December 2021

Abstract
The urgency of anticorrosive protection issues of ship hulls, deck structures, mechanisms, etc., as one of the main problems of the naval, is noted. One of the options for its effective solution is the use of coatings based on various polymer-composite materials. The authors substantiate the need for a preliminary assessment of the reliability and durability of such coatings, taking into account high humidity and aggressiveness of the operating environment, the corrosion of the repaired surfaces, the cyclic effect of stresses and alternating temperatures, etc. Proceeding from this, using the example of multicomponent polymer-composite compositions of the “Sprut” type, methodological approaches to the study of the polymer-composites durability for ship repair are considered. Their comparative characteristics are given. A mathematical model for assessing the durability of polymer-composite materials and coatings based on them is described, and the experimental studies’ results of their durability under static and cyclic stress in the operating temperature range are presented. The obtained results of theoretical and experimental studies are important for development of the methodological approaches to increasing the durability of mastic deck coatings based on polymer composite materials and the development of practical guidelines for the use of adhesives in shipbuilding and ship repair. The research results make it possible to develop new and improve the adopted technologies for the use of protective coatings on the structures of ship hulls and deck structures. Thus, the problems of the water transport operation, associated with the anti-corrosion protection of ship hull and deck structures and their repair, can be solved.
Study of synthesis of hydrogen and hydrocarbons by mechanochemical activation of the surface of mineral rocks
Authors: Klimov D 
Published: December 2021

Abstract
In the light of the eternal discussion regarding the sources of hydrocarbons for the initial oil and gas-forming substance, it is possible to recognize the legitimacy of both organic matter, which is confirmed by the biogenic theory of the origin of oil, and deep gases, declared by supporters of the theory of the inorganic concept, referring to the extraordinary richness of hydrocarbons in the mantle. But, the catagenic stage, the process of obtaining oil from the initial substance, in which the primary carbonaceous substance (often under such hypothetical concepts as “micron-oil”, “fluids”) passes into hydrocarbons in the form of oil deposits, causes no less scientific interest and also insufficiently studied. The author sees it as fair to attempt to put emphasis on predominantly geodynamic conditions, tectonic stresses, physico-chemical and thermobaric conditions, the generation of hydrocarbons, on the basis of the synthesis of hydrocarbons in any geological period. The article proposes the author’s chemical model describing the low-temperature polycondensation synthesis of hydrocarbons from water and carbon dioxide in the process of mechanical reactions on the surface of a rock model.
Optical properties of Er: LiNbO3 ceramics on Yb, Er: LiNbO3 substrate
Authors: Stroganova E V , Ponetaeva I G , Puzanovskiy K V , Galutskiy V V , Kuplevich M V 
Published: December 2021

Abstract
The present research focuses on the study of the polarization and temperature dependences of the luminescent kinetic spectral properties of Er: LiNbO3 ceramics deposited on Yb,Er: LiNbO3 crystal substrate by laser ablation.
Molecular dynamics study of the influence of supercooling temperature and orientation of the crystallization front on its velocity in silver
Authors: Poletaev G M , Bebikhov Yu V , Semenov A S , Yu Rakitin R 
Published: December 2021

Abstract
The molecular dynamics method was used to study the influence of the supercooling temperature and the orientation of the crystallization front relative to the growing crystal on the front velocity in silver. According to the data obtained, the crystallization velocity with an increase in the supercooling temperature does not increase monotonically, but has a maximum at about 0.7-Tm (Tm
is melting temperature), after which it gradually decreases, which is explained by a decrease in the diffusion mobility of atoms in the amorphous phase. Crystallization proceeds faster with the orientation of the front plane (100), slower - with the (110) and (111) orientations.
Phenomenological physical foundations of structural dynamics in technical mechanics
Authors: Mogiljuk Zh G , Poduval’tsev V V 
Published: December 2021

Abstract
The article deals with the problem of forming dynamic thinking in the course of technical mechanics. This problem covers various forms and levels of professional training, including engineering courses in structural mechanics, postgraduate and doctoral studies. The study of this problem in the article is carried out using dynamic concepts in technical physics and metrology. The main method for analyzing this problem is the method and theory of vibroacoustic computational modeling developed by Prof. Hlystunov M.S. The article presents a comparative analysis of the reaction of a cantilever beam to static and dynamic load. The dynamic characteristics of such a beam, including its AFFC, AFC and FFC, resonances and antiresonances, are considered. Then we consider the reaction of the simplest two-rod frame to a dynamic load and its fundamental difference from the reaction to a static load. The article provides detailed mathematical calculations using the corresponding section of operational calculus. The terms, definitions, and mathematical representations used in the article correspond to similar classical concepts that are widely used in metrology, technical cybernetics, and technical physics. The article is provided with the necessary illustrations for a visual representation of the main dynamic characteristics and properties of building structures.
Two-stage magnetic-elasto-pulse stamping of thin sheet parts
Authors: Nescoromniy S , Strizhakov E , Minko D 
Published: December 2021

Abstract
The article substantiates the use of preliminary static loading and subsequent forging force when stamping thin sheet parts of complex shape with an elastic punch. The static load provides a relative deformation of the order of 20– 30% in the processing zone, which guarantees the stability of the position of the workpiece during subsequent pulsed loading. This technique is very important in the manufacture of asymmetric parts with a thickness of 0.01 – 0.3 mm. As a result, the accuracy of the products obtained corresponds to the 7th grade.The article provides a schematic diagram and a description of the proposed design of a double-action press, and analyzes the cyclogram of the device.It is recommended to carry out a static load with an electric drive, a pulsed one with a magnetic hammer, which is connected to a generator of impulse currents with a capacitive storage with an energy capacity of up to 40 kJ with a natural discharge frequency of the current of 20 kHz.
Electro-plasticity’s Effect By Deformation And Impulse Impact Of A High Energy Electromagnetic Field
Authors: Kochetov Andrey , Fisunova Elena , Lavrenova Tatiana , Filonenko Lyubov 
Published: December 2021

Abstract
The problem of obtaining predicted physical and mechanical properties and a given service life of multifunctional composite protective coatings in the form of barrier layers that increase the service life of mechanical engineering products and formative tools are inherently interconnected. Among all the variety of innovative highly efficient technological processes, a special place should be given to the method of electro-acoustic spraying (ELAN). This method is innovative in the field of synthesis of multifunctional composite coatings, which allows the formation of protective films of an amorphous material on any conductive substrates [1]. This technology is based on the use of the complex energy of an electric spark and a complex ultrasonic field. The aim of this work is to optimize the process of obtaining multifunctional composite protective coatings based on the complex mass transfer of the electrode material and the subsequent formation of amorphous structures with predictable physical and mechanical properties by the method of electro-acoustic spraying based on the effect of electro-plasticity during deformation and pulsed action of a high-energy electromagnetic field.
Friction welding of carbon quality steel
Authors: Schepkin V , Poletaev Yu 
Published: December 2021

Abstract
The aim of the work is to study the possibility of using, instead of manual arc welding with a covered electrode, a method of friction welding of fittings and small-diameter branch pipes of hull power plants. The solution to this problem is possible on the basis of the application of the friction welding process of small diameter nipples and nipples. Given the insufficient theoretical and experimental study of the problem, it was necessary to solve the following scientific and technical problems: to develop the design of the models and the connected (conical) surfaces of the choke and branch pipe assemblies; substantiate the choice of optimal angles for preparing surfaces for welding; justify the choice and experimentally confirm the values of the welding mode parameters; to assess the quality of welded joints by non-destructive and destructive methods. The obtained positive results of the experimental study confirmed the technological feasibility and economic feasibility of using friction welding of carbon steel fittings and small-diameter nozzles.
Procedure for calculation of the admissible continuous power transmission currents of overhead wires and contact lines
Authors: Zharkov Yu I , Figurnov E P , Kharchevnikov V I 
Published: December 2021

Abstract
The proposed methodology summarizes published and original domestic and foreign theoretical and experimental materials on heating and cooling of spiral and shaped wires of overhead power transmission lines and electric power systems and uses those of them that best meet the fundamental laws of heat transfer. Formulas for calculating the surface area for spiral and shaped wires are given. A generalized formula for the convective heat transfer coefficient taking into account the direction and speed of the wind, including for the anti-ice regime, is given. The parameters of this formula do not coincide with the existing ones, since they are based on the experimental data for spiral and shaped wires, and not for round pipes. The formula for calculating the power of heat transfer under solar radiation is given. A generalized formula is given for calculating the continuous allowable current, all components of which are described in detail in the article.
Calculation of aerial contact wire volume heated by a moving electric ARC
Authors: Semenov Yu G , Kondrashov I A 
Published: December 2021

Abstract
The article is devoted to the study of the problem of electrified railways electric locomotive current collectors’ interaction violation with an aerial contact wire, accompanied by the occurrence of an electric arc. Current collection disorders, accompanied by arcing, have a destructive effect on the contacting elements, causing their thermal erosion. Places where current collection violations occur should be registered and diagnosed in a timely manner in order to prevent an emergency situation associated with burnout or breakage of the aerial contact wire. In order to further develop the system of technical diagnostics for current collection disorders accompanied by arcing, it is necessary to study the nature and parameters of the processes occurring during these violations. The main part of the article is devoted to the study of the area of heating the aerial contact wire by a moving electric arc. The characteristics describing the heated area are geometric parameters, including the area in the cross section of the wire and the volume of the area. To obtain the necessary data, the method of heat sources was applied, which is a mathematical model that describes the process of heat propagation in an aerial contact wire. The electric arc arising when the current collector breaks off is considered as a mobile heat source distributed over the aerial contact wire surface in the heating zone and having a limited radius of the heating spot. Based on the heat propagation process peculiarities inside the aerial contact wire, a method for calculating the volume of the heated area bounded by an isothermal surface of a certain temperature is presented. The heated area was visualized using the PTC MathCAD.
Analysis methodology for the design of start-up rheostats on thermo-dependent polycrystalline resistances
Authors: Voronova N P 
Published: December 2021

Abstract
The article provides a brief analysis of the starting processes of electrical devices in autonomous systems of limited power. The existing methods of automatic start-up and regulation of the operation of electrical machines and apparatus are considered, which are a multi-link system, the reliability of which is determined by a number of intermediate links, and the stepping is one of the biggest drawbacks that negatively affect the dynamics of the starting process. In addition, the issues of simplicity, low cost and small dimensions of the automatic control system for electrical installations are of particular importance in the problem of energy saving. The use of low-power thermistors as part of starting devices requires intermediate equipment and various components, which significantly reduces the reliability of the equipment. The increase in currents flowing through the ballasts simplifies the electrical control and regulation circuits. For the use of polycrystalline semiconductor thermistors in circuits with high currents, it is necessary to use special designs in order to prevent overheating of the thermistor material. The article provides algorithms for the synthesis of starting rheostats. A number of restrictions are considered and formulated, on which the nature of the processes of starting electric motors with the help of thermistor rheostats, which ensure the fulfillment of certain restrictions, depends. Recommendations are given for the formation of optimal starting processes using rheostats built on semiconductor polycrystalline thermistors.
The electric substations compensating devices’ distribution optimization
Authors: Yu Mikaelian E , Trubicin M A 
Published: December 2021

Abstract
The article discusses methods for calculating electrical networks when choosing the consumer compensating devices’ location. The main network and calculation module of a complex network is analyzed. The mathematical support of the reactive power factor compensation (PFC) problem is described in regional power systems, the areas of application of individual models are substantiated, and the results of the practical use of the corresponding calculation results are analyzed.
Customer compensating device placement control in energy systems
Authors: Yu Mikaelian E , Trubicin M A 
Published: December 2021

Abstract
The choice of the installation site for compensating devices is determined by various factors that should be taken into account when performing calculations. The location of reactive power compensation devices is determined by the results of mathematical modeling and the optimal operating mode of individual sections of electrical networks. The paper presents the results of modeling, considers the uncertainties encountered when solving the problem of placing compensating devices.
Forecasting of the efficiency indicators of the use of boiler and furnace fuel in the non-traction power engineering of railway transport based on the model of temporaryth row
Authors: Rozhitskiy D , Bardykin Yu , Pavlov Yu , Repin A , Chernikov V 
Published: December 2021

Abstract
The article considers the solution of the problem of constructing forecast values for a long period of changes in the value of the specific consumption of boiler and furnace fuel by boilers for a geographically distributed company-Russian Railways, taking into account the use of various types for the main types of fuel used in the generation of thermal energy: natural gas, heating oil, coal and brown coal. A mathematical model based on time series using the Bollinger method is proposed, which includes elements of extrapolation and modeling. An example of calculating the change in the values of specific consumption in the future until 2035 in the whole railway network is given. A simulation of the change in this value is performed for the variant fractions of substitution of one type of fuel with another. The possibility of determining long-term forecast indicators using a time series model is shown.
SRM simulation with reduced amount of initial information taking into account saturation of magnetic circuit
Authors: Tchavychalov M V , Nabokov A E , Bolshikh I V 
Published: December 2021

Abstract
The article describes the currently used approaches to mathematical modeling of switched reluctance electric machines. It is shown that the traditional approach uses a large amount of initial information on the dependence of the flux on the current and the angular position of the rotor in the form of lookup tables. It is proposed to use the description of the flux using the hyperbolic arcsine function. This approach will reduce the amount of preliminary information and thus simplify the procedures for configuring control systems.
Reducing the noise level of power transformers
Authors: Kostukov A V 
Published: December 2021

Abstract
The results of studies of the noise of power transformers at the enterprises of the machine-building complex are presented in this paper. The causes of the noise of power transformers are identified, the analysis is made, and the main design indicators affected the increase in the sound power level of high-voltage converters are determined. Based on the analysis of design indicators, organizational and technical measures are proposed for improving reliability and accident-free operation of power transformers, as well as reduction of the noise level of power transformers.
Improvement of passenger car power supply
Authors: Nikitin V V , Trifonov B A 
Published: December 2021

Abstract
A significant part of the fleet of passenger cars in operation on Russian railways are equipped with an autonomous power supply system, in which the main source of energy is an undercar generator, which is rotated from the axle of a wheelset. The disadvantage of such a system is the limitation of the speed range in which it is possible to power consumers of electric power of a passenger car from the main source: as a rule, the lower limit of this range is 35 km/h. The article proposes a variant of a technical solution that will expand the speed range of using the undercar generator by lowering the lower limit to 25 km/h: it is proposed to provide self-excitation of the undercar generator through an inverting-type DC voltage pulse converter. The parameters of the elements of the pulse converter circuit and the possibility of expanding the boundaries of the high-speed range of operation of the EGV.08.1U1 undercar generator are estimated.