bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the distribution morphology of alumina nanofibers in polyester resins
Authors: Simunin M M , Chirkov D Yu , Zaloga A N , Fadeev Yu V , Kuular A A 
Published: December 2022

Abstract
In this paper, the morphology of nanocomposite polyester resins has been studied. The basis was polyester resin NH6586 produced by Kinte. Aluminum oxide nanofibers were introduced into the resin, which are single crystals or chains of single crystals with the γ- Al2O3 structure with a diameter of 5 to 15 nm and up to 1 mm in length. The additive was introduced into the resin by the industry standard twin screw extrusion method. At the same time, the influence on the uniformity of distribution of the addition of mineral filler - submicron particles of titanium dioxide - was studied. It has been shown that conventional methods of mixing the additive do not allow the nanofibers to be completely distributed. In such cases, they are distributed in the form of microbundles. The addition of mineralfiller to the polyester resin improves the distribution of the alumina nanofibers so that no bundle inclusions are observed in the resin cleavage. Thus, it can be concluded that mineral additives of isometric particles are an effective homogenizer of aluminum oxide nanofibers in polymeric materials.
Short-term reliability prediction for highly noisy radio engineering systems
Authors: Vasilkov Yu V , Sovetov V A , Kessidi K A , Yaskin E A 
Published: December 2022

Abstract
Evaluating the effectiveness of complex systems is becoming difficult due to the increasing complexity of such systems, as well as the high significance of predictions of their technical condition. Therefore, the experts pay considerable attention to them. This is largely due to the large number of components (blocks, nodes, elements) of such systems and the variety of technical and information links between them. All this causes an avalanche-like increase in the number of studied properties that affect the reliability of the entire system. The paper considers the problem of identifying linear and harmonic components in a highly noisy time series based on information obtained during its operation. It shows how to separate various components (linear, harmonic) from the general time series. The work is aimed at short-term prediction of the functioning reliability of radio engineering devices for solving certain fast operations over a given time interval. After the deterministic components are isolated from the time series, the error of its short-term prediction is estimated based on the remaining random centered component by its variance.
Signal-to-noise ratio measurement for the signals with constant amplitude
Authors: Chernoyarov Oleg , Glushkov Alexey , Litvinenko Vladimir , Litvinenko Yuliya , Pergamenshchikov Serguei 
Published: December 2022

Abstract
A digital meter measuring the signal-to-noise ratio in the channel for transmitting discrete information with a constant amplitude of symbols that are the phase or frequency shift keyed signals is proposed. The desired value of the signal-to-noise ratio is determined based on the number of exceedings of the threshold level by the modulus of the logarithm of the ratio of the amplitudes of the received and previous symbols in the sample of a specified size, while the meter itself is invariant to the absolute levels of the signal and noise. It is shown that in the channel with Gaussian noise, this number depends only on the desired signal-to-noise ratio. The necessary calculation relations are successfully obtained; it is also established that the Gaussian approximation of the symbol amplitude probability density is valid. Statistical simulation of the meter operation has been carried out for receiving binary phase shift keyed signals. It is proven that the given theoretical meter characteristics are in satisfactory agreement with the corresponding experimental data and the small measurement error is provided within a wide range of signal-to-noise ratio values.
Comparison of theoretical modeling of natural frequencies of a pipe section with data obtained empirically
Authors: Maykov O A , Kokhonkova E A 
Published: December 2022

Abstract
The article explores the issue of modeling a pipeline section, to determine the possibility of diagnosing the state of the pipeline walls, by analyzing the frequencies of natural vibrations. This method is considered as a possible alternative to in-line diagnostics of main pipelines. Frequency analysis allows to determine the defective state of the walls by reading vibrations with a vibration sensor located on the body of the pipeline.
Electron-beam additive manufacture to produced ER321/CuA19Mn2: microstructure and mechanical properties
Authors: Panfilov A O , Zykova A P , Chumaevskii A V , Vorontsov A V , Yu Nikonov S , Shmakov V 
Published: December 2022

Abstract
Used electron-beam additive manufacture with two wire filaments simultaneously produced composite 321SS/CuA19Mn2 with 50:50 components ratio. Investigated of microstructure and mechanical properties of composite 321SS/CuA19Mn2 and compared with properties of stainless steel with aluminum bronze produced by electron beam additive manufacture. It was found that the formation of the composite 321SS/CuA19Mn2 leads suppresses of the residual β’-phase: diffusion of elements initiates phase transition from γ-Fe to α-Fe and leads to formed nanoparticles of κiv-phase in solid solution of α-Cu. Mechanical tensile tests and microhardness were showed composite 321SS/CuA19Mn2 have highest microhardness (∼3280 GPa) and highest tensile strength (830 MPa) as compared with steel and bronze produced by additive manufacture.
Setting the level of design inputs for the seismic stability structures
Authors: Uzdin A M , Ivanova T V , Sorokina G V , Lin Hong , Kurbanov Kh Kh , Nazarova Sh Sh 
Published: December 2022

Abstract
The paper deals with the task of setting the level of the design input for assessing the structure seismic resistance. An increase in the expected peak ground accelerations with the development of the earthquake engineering from 1 m/s2 to 7 m/s2 is noted. The absence of a correlation between the peak ground accelerations and the seismic action intensity, as well as the dependence of the peak ground accelerations on the action spectral composition, is explained. A method of determining the ground design acceleration using the standard seismic scale in force in Russia is shown. The illogicality of setting the design input according to of the Guidelines “Earthquake Engineering” in force in Russia is shown and ways of correcting the current situation are indicated. It is noted that to solve the problem of setting the design input, no seismic zoning maps are required. Information on seismic hazard can be represented by a single number characterizing the relationship between the intensity and repeatability of the action on the construction site. The relationship between the design accelerations stated in the «Earthquake Engineering» Guidelines and the peak ground accelerations in the «Seismic Intensity Scale» State Standard is explained. The approach described in the paper is the basis for input setting for performance-based designing.
Smooth-polylines vs. polynomials in balanced identification technology: solving inverse problems of thermal conductivity
Authors: Sokolov A V , Voloshinov V V 
Published: December 2022

Abstract
Various parameters’ identification problems of one-dimensional nonlinear heat equation are considered. Their numerical study was carried out on the basis of balanced identification technology, which provides a compromise between the simplicity of the model (the curvature of the functions) and the proximity to experimental data. The problem of identifying functions whose arguments are model variables is considered. When approximating such a function, we had to use a polynomial function – the use of polylines (polygonal lines) in this case (superposition of functions) leads to nonsmooth mathematical programming problems (with discontinuous derivatives) with the solution not supported by standard solvers. An investigation of the use of special smooth approximations of polygonal curves (smooth-polylines) is presented.
Investigation Ne ions scattering from the stepped InP(001)<ī10> surface
Authors: Kutliev U O , Otabaev M U , Karimov M K 
Published: December 2022

Abstract
We present in this paper possibility of using glancing incidence ions scattering process for the determination of surface atomic step. We study the grazing scattering of Ne+ stepped InP(001)<ī10> surface in small angle of incidence ions. Additionally, we elaborate on the spectra of energy some intensive maximums formed by ions scattered from the monoatomic surface steps. Based on concrete examples, we also observe the effect of the atomic mass of the stepped atoms on the process of ion scattering. We study the trajectories of ions which scattered from stepped InP(001)<ī10> surface and found that the track of scattered ions have a zig-zag shape. An ion Ne trapped in a channel formed by an atomic step, after passing some distances, dechannels due to a hard collision of one of the atoms forming the basis of the channel. The physical settings of dechannelized Ne ions were analyzed and calculated, and this calculation makes it possible to understand the mechanism of ion dechanneling.
Study of the structure of gas dynamics of the flow in the vicinity of the central body, at different heights
Authors: Kaun Yu V , Brykov N A , Mikhailov M V 
Published: December 2022

Abstract
The problem of jet flow through the critical section of a nozzle with a central wedge-shaped body with subsequent interaction of the jet with the wall of the central body and the flow of co-current atmospheric air is considered. The structure of the gas-dynamic flow in the vicinity of the central body of the nozzle channel at the control points of the altitude range of the flight of the aircraft is investigated.
Physical modeling of the passive induced polarization method for the possibility of estimating the depth of the ore body simulator
Authors: Belolipetskii P V , Shajdurov G Y , Potylitsyn V S , Krasnov T V , Kokhonkova E A , Maykov O A 
Published: December 2022

Abstract
The article presents physical modeling data for the passive method of induced polarization for the possibility of estimating the depth of immersion of the ore body simulator. Experimental observations were carried out on a laboratory tank filled with sand, the observation time for each measurement point was 180 s, the sampling frequency was 1 kHz. In the course of physical modeling, measurements of the induced polarization parameter were carried out in the absence of an ore body simulator, with its immersion by 10 cm and 20 cm, as well as with full immersion and immersion to a depth of 30 cm. As a result of physical modeling with an ore body simulator, the following results: the dependence of the induced polarization parameter was obtained with increasing depth; with increasing depth, the change in the induced polarization parameter decreases; the background value of the induced polarization parameter in the absence of an ore body simulator leads to a decrease in the sensitivity of the measurement equipment.
Optimum control of an asynchronous electric drive
Authors: Tulyaganov Murot 
Published: December 2022

Abstract
The article proposes the main stages of compiling mathematical models for calculating and analyzing the dynamic and thermal modes of asynchronous motors in systems of an automated frequency electric drive are described. The application of the maximum principle and the Newton-Raphson method is given, as well as the solution of the problem using the maximum principle, which leads to a doubling of the number of differential equations. Under these conditions, the search for the initial values of auxiliary functions by the Newton-Raphson method is complicated by a circumstance associated primarily with the convergence of the method, since the convergence region occupies a small part of the coordinate space around the desired optimal point. To determine the required initial approximations, new method variable shift steps are proposed. The proposed method for improving the region of convergence of the Newton – Rafson method make it possible to calculate the optimal control parameters of a frequency-controlled asynchronous electric drive. Based on the calculation results, the curves of the basic and optimal starts of an asynchronous motor in a constant flow mode for the optimization criteria in terms of speed and minimum heating were obtained. On the basis of calculations and analysis of dynamic characteristics, practical conclusions were made. The results provide scientifically grounded recommendations to developers, designers and operators, as well as allow to improve the energy and performance indicators of automated frequency-controlled asynchronous electric drives intended for sectors of the national economy.
Evolutionary structural optimization of vulcanization molds
Authors: Glebov A O , Skomorokhova A I 
Published: December 2022

Abstract
A method of evolutionary topology optimization of vulcanization molds according to the criteria of the maximum temperature deviation in the volume of the rubber mixture from the set value and the mechanical compliance of the structure is proposed. To take into account the transient of the mold heating process, the condition of specific heat absorption in the volume of the processed rubber mixture is proposed. The problem of topology optimization of a mold for the manufacture of a rubber diaphragm has been solved. The analysis of the received results from the point of view of efficiency of the decision and manufacturability of a design is carried out. An engineering interpretation of the results of topology optimization has been carried out.
Assessment of the environmental impact on the life cycle of polystyrene thermal insulation materials
Authors: Zhukov A D , Zhuk P M , Stepina I V 
Published: December 2022

Abstract
The assessment of environmental impacts on the life cycle of thermal insulation materials is a complex task that has a significant impact on the market for heaters and the types of structures used. In this case, such important factors as the effective reduction of heat losses due to the use of foam plastics, the nature of raw materials for their manufacture, methods of processing and disposal, as well as possible effects associated with the presence of toxic components at different stages of the life cycle, should be taken into account. In addition to the analysis of generally accepted criteria related to energy costs, the impact on the greenhouse effect, the formation of photochemical smog, the destruction of the ozone layer, the acidification of water and soil, eutrophication, it is interesting to assess the local effects associated with the state of natural and man-made systems at all stages of the life cycle of thermal insulation products made of polystyrene. The article substantiates the need to assess the environmental impacts throughout the life cycle of expanded polystyrene in construction, including through the development of environmental declarations for these products. It is expedient to systematically collect waste heat insulation from expanded polystyrene, as well as to introduce modern methods of processing and disposal, including the use of biologically active living organisms. It has been established that the state of local natural-technogenic systems associated with the life cycle of expanded polystyrene boards correlates with indicators of global impacts in terms of ecological capacity and reproductive capacity for oxygen. Studies of boards made of graphite-containing polystyrene foam have confirmed lower environmental impacts, both by reducing the content of expensive polymer raw materials and by strengthening the structure.
Spectroscopic features of diphenylaryethylenes and arylpolyenes having substituted groups in pairs
Authors: Astanov Salih , Kasimova Guzal , Shamsiev Rustam 
Published: December 2022

Abstract
The spectral and optical characteristics of 4,4′ substituted stilbene and diphenylpolyenes were determined depending on the nature of the substituents. It is established that as a result of the dipole-dipole interaction of Van der Waals forces and the entrainment of the electron energies of molecules in the studied compounds, a botochromic shift of the adsorption and luminescence spectra is carried out. It is determined that for 4,4′ substituted arylethylene molecules with protonadonnor substituted groups, high values of the quantum yield of luminescence are observed, which are recommended for their use as fluorescence probes.
Calculation of surface contact interaction in friction
Authors: Rachishkin A A 
Published: December 2022

Abstract
The article briefly reviews analytical works on methods for calculating the parameters of contact interaction of rough surfaces. The influence of information technology development on scientific research and engineering problem solving is described. The contact of simulated surfaces is described. A number of assumptions are accepted and the principle of distribution of the protrusions of the rough surface is established. Further, the processes occurring during the contact interaction of rough surfaces in friction are described. Calculation relations are derived to determine the number of contact interactions between the protrusions of the surfaces under consideration. The volume of deformed material in the case of perfectly plastic deformation of its surface by absolutely rigid irregularities of the second surface is determined. The results of the work can be used for building calculation models of tribocouple wear and for the development of computer programs for modeling the processes of contact interaction of rough surfaces in friction.
Ferroelectric-superconductor structures properties
Authors: Pevtsov Evgeny , Demenkova Tatiana , Filimonov Vladimir , Golikova Olga 
Published: December 2022

Abstract
At the present time the urgent direction is to investigate the possibilities of new materials as a base for further improvement of very large-scale integration in order to create elements of submicron digital circuits with improved characteristics. The paper presents and discusses the results of measurements of volt-farad characteristics of structures with PbTiO3/YBa2Cu3O7-x ferroelectric films on strontium titanate substrate. New data on the characteristics of heterostructures with thin ferroelectric films are obtained, in particular it is shown that in the volt-farad characteristics of the studied structures local violations of the smooth forward sweep in the form of characteristic dips at the values of the applied field strengths close to the coercive ones determined by the ferroelectric hysteresis loops are observed. This effect can be explained by the emergence of built-in charges at the interface between a segmented dielectric and a high-temperature superconductor as a result of the polarization switching dynamics of the segmented dielectric. Quantitative estimates of the corresponding values of the embedded charges are made. Another explanation can be the assumption that the nature of these minima is related to the negative capacitance effect in segmentelectrics during polarization switching. The obtained results of the research serve as a basis for consideration of the observed effects in the design of a number of devices related to this subject area, in particular, non-volatile memory and gates based on MOS transistors, in the design of which heterostructures with ferroelectrics are used.
Experimental Study of Chip Shrinkage in Turning Titanium Alloy VT6
Authors: Pyatykh A , Timofeev S 
Published: December 2022

AbstractThe article proposes an analysis of the study of turning a titanium-based alloy used for the manufacture of surgical implants. The main focus is on machinability problems associated with the choice of rational cutting parameters, which determine the quality and durability of pedicle screws. The conclusion is made about the need for research aimed at ensuring maximum performance and application of practical data for the manufacture of medical implants. To carry out experimental studies, non-free cutting of a titanium alloy bar was performed with a cutter fixed in a turning dynamometer. Graphs of cutting forces versus cutting speed and feed were used to select an effective combination of machining parameters. A thermal imaging camera was used to evaluate the effect of processing parameters on the temperature of the processed sample. Conclusions are drawn about the dependence of the coefficients of longitudinal and transverse chip shrinkage on the processing parameters. The results of the research analysis show that when turning titanium alloy VT6, the coefficient of transverse chip shrinkage, which characterizes the broadening with increasing cutting speed, remains unchanged. The goals of further research aimed at clarifying the optimal cutting conditions for turning transpedicular fixation screws from VT6 were determined.
Wideband high-speed DAC-based frequency synthesizer
Authors: Romashov V V , Yakimenko K A , Doktorov A N 
Published: December 2022

Abstract
Wideband hybrid frequency synthesizer with phase-locked loop (PLL) and high-speed direct-to-analog converter (DAC) is presented. The use of special DAC operating modes allows to expand the synthesizer generating frequency band. Presented synthesizer also provides a low phase noise due to using RF mixer in PLL feedback.
Modeling the processes of extracting gas from gas hydrate deposits by means of coolant circulation
Authors: Davletshina M R 
Published: December 2022

Abstract
The article presents the results of numerical simulation of the process of gas extraction from a gas hydrate in a porous reservoir of finite length saturated in the initial state with hydrate The dependence of the decomposition velocity and front on the temperature of the coolant is shown. A quasi-stationary solution of the equation is constructed under these boundary conditions.
The effect of heat treatment on oxygen content and microstructure of near-surface areas of titanium hydride coated with tungsten carbide
Authors: Gorodov A I , Mogutova A A , Matyukhin P V , Romanyuk D S 
Published: December 2022

Abstract
The article proposes a method of magnetron vacuum deposition of tungsten carbide coatings on spherical hydride granules. The article also illustrates the features of the microstructure and the uniformity of the resulting coating. The effect of heat treatment on the oxygen content in the near-surface areas of titanium hydride coated with tungsten carbide is investigated. The features of the coating structure were studied using by scanning electron microscopy (SEM) with a built-in energy dispersion spectrometer. Comparative data on thermal oxidation of uncoated spherical granules and granules coated with tungsten carbide are presented.