bluuebunny/crossref_metadata_2025_split huggingface dataset:
Method of cutting metal ingot with changing direction of deformation
Authors: Voronov Vladimir , Videnin Sergey , Masich Igor 
Published: December 2022

Abstract
The paper considers the priority problem of cutting an ingot with a changing direction of rolling which can be presented as a priority problem of packaging with incompatible categories and dynamically changing bin sizes. This problem is a NP-complete optimization problem which is often found in the production of metalwork. Priorities reflect the “importance” of manufacturing elements for production and incompatible categories show that elements of different thicknesses cannot be made from the same bin. In addition, we use guillotine restrictions to take into account the specifics of production. The problem of cutting the ingot is characterized by the fact that the bin sizes are not known in advance. Thus, the task is to find the optimal bin sizes, the sequence of actions and the placement of elements in these bins. We propose a sequential tree metaheuristic to solve this problem. It is a deterministic method. This method is based on sequential metaheuristic which was proposed by the authors earlier. The proposed method also has the ideas of dividing a set of elements into groups and subgroups by thickness and priorities, as well as their sequential packing. However, it differs from previous one in that it uses a tree to represent options for rolling operations. The best subtree from the point of view of any criterion, formed as a path from the root to one of the nodes, will be the solution. The ability to find several better solutions with the same value of the criterion is another advantage of the proposed method. Such a situation may arise, for example, for a square ingot. In this case, two solutions are possible with accuracy up to 90 degrees rotation of the workpieces. The priority heuristic is used as a heuristic to solve the packaging subproblem. The results of computational experiments are based on test cases which were compiled specially. Test instances differ in the number and characteristics of elements, categories, priorities. The results show that the metaheuristic proposed by the authors solves the problem effectively.
Investigation of the possibility of controlling the formation of physical and mechanical properties of aluminum alloys under pressure crystallization
Authors: Denisov M S 
Published: December 2022

Abstract
The study of scientific and technical materials showed that the existing control systems for technological processes of casting with crystallization under pressure are not effective enough. The paper presents a control system capable of real-time measurement, control and correction of the main technological parameters of the process, such as the time and nature of the temperature distribution in the tooling and casting, the rate of pressure imposition on the crystallizing metal, the magnitude of the applied pressure. These parameters have a direct impact on the formation of the properties of the final product. The paper defines the parameters of the response of the control system to fast crystallization processes for the timely prediction of the properties of the final product. The paper proposes a technology for metal processing by pressure prior to the onset of crystallization. In the process of conducting experimental studies in castings, it was possible to achieve the same uniform distribution of components, gas and non-metallic inclusions, as in a superheated liquid metal, bypassing the development of diffusion. As a result of ultrafast application of pressure to a level of 500 MPa on the liquid metal, it was possible to realize the process of compression of the crystal lattice to such limits at which it was possible to exclude the diffusion of components along structural defects. Due to the programmed application of pressure on the liquid and crystallizing one, the idea of controlling the processes of distribution of intermetallic compounds, non-metallic and gaseous inclusions has been realized.
Application of metal powders to bronze bushings
Authors: Golinitskiy Pavel , Temasova Galina , Antonova Uliana , Cherkasova Elmira , Vergazova Julia 
Published: December 2022

Abstract
Bronze bushings have become widespread in the mobile data of machines, the reuse of which is complicated by the insufficient elaboration of the recovery technology, which has a negative impact on environmental friendliness. To improve the current situation, we carried out research on the development of a technology that allows electrocontact welding of metal powders of nickel and iron onto bodies of revolution made of bronze. The main difficulty on the way of applying this method of recovery is the different melting temperature of bronze and welded metal powders, but the use of a special shell developed by us and the modes identified made it possible to solve this problem.
Investigation of nanostructured hard metal composites obtained from powder mixtures (WC-Co)-Al2O3
Authors: Gordeev Yu I , Zeer G M , Yasinsky V B , Binchurov A S , Usevich N I , Timoshev P V , Filippov S V 
Published: December 2022

Abstract
A new stereological model of nanostructured hard metal composites is suggested which describes the packing density, structural parameters and fracture toughness depending on the sizes, volume of the carbides and addition of nanoparticles Al2O3. The results of complex theoretical and experimental investigations of hard metal composites based on powder mixtures (WC-Co)-Al2O3(nano) are presented, which confirm the possibility of improvement of the structure parameters (with the average size of the binder interlayer being up to 0.12 μm and carbide grain up to 1μm), increasing the hardness 15-18 HV, GPa, fracture toughness, K1c, 16-19 MPa m1/2, transverse rupture toughness, σи - 2700 MPa. The results of the modeling experiments are in satisfactory agreement with the measurements of structure parameters and fracture toughness.
Research of composition of oily part, obtained from the “Yellow oil” - wastes of pyrogas cleaning process by the method chromatography-mass spectrometry analysis
Authors: Tilloev Lochin , Dustov Khamro , Murodov Malikjon 
Published: December 2022

Abstract
In the article, in order to study the properties and composition of organic and inorganic components obtained from processing of waste “yellow oil” by alkaline purification of pyrogas from sour gases in the existing gas chemical complexes in Uzbekistan and to determine its practical application, they were divided into components for the first time. The hydrocarbon composition of the oily part of the separated compounds has been studied using the gas chromatography-mass-spectrometry analysis method. Based on the results of the gas chromatography-mass-spectrometry analysis, the volumetric quantities of individual components were determined. Based on the results obtained, the areas of application of the oily part (as thickeners, fillers and additives) were studied, they were exposed to different functional groups, and preliminary data were obtained on the possibility of obtaining surfactants and raw materials for the paint industry by chemical reactions. Subsequent research has identified tasks that need to be addressed.
Mathematical bases of calculation of gas-dispersed flows in vortex dust collectors
Authors: Barakaev N R , Jalilov R S , Muxammatova U X 
Published: December 2022

Abstract
Development of numerical methods for calculating the movement of gas-dispersed flows in vortex and inertial separators, creation of devices with counter tangential and flows of increased dust collection efficiency, determination of the optimal profile of corrugated channels in order to minimize the release of droplet moisture from inertial separators.
Assessment of the impact of marine ferry routes on the environmental situation of the Baltic Sea based on data from information-measuring systems
Authors: Maiorov N N , Dobrovolskaia A A 
Published: December 2022

Abstract
Passenger and accompanying cargo-passenger maritime transportation on the Baltic Sea acts as systematic elements of the Baltic transnational macro-region. Ships that meet various environmental requirements today operate the ferry routes. The task of ecological safety assessment when introducing new ferry routes takes on special urgency. The paper contains analytical data of the marine ferry transportation industry, the main trends of the industry development. The analysis of the main ferry companies is performed and the main variables for estimating the level of possible pollution of the Baltic Sea are determined. Models for calculation of navigation autonomy by taking into account dimensions of allowable sewage and dry garbage are given. Based on the performed analysis of intensity of operation of sea ferry lines the forecast of areas of the Baltic Sea in which there will be an increase of ecological load is made. The necessity of development of information-measuring system for the assessment of the ecological situation of the Baltic Sea on the main directions of the sea ferry lines is substantiated. The structure of information-measuring system for monitoring of ecological situation at performance of sea ferry transportations is offered.
Method for determining the mass conductivity coefficient of wood when extracting biologically active substances from it
Authors: Safina A V , Valeev K V , Ziatdinova D F 
Published: December 2022

Abstract
The article presents a method for determining the mass conductivity coefficient of wood when extracting biologically active substances from it. To implement the method, there was an installation developed, the internal cavity of which is divided into two zones filled with liquids with different concentrations of the extracted substance. The installation zones are separated by the investigated wood material. The determination of the mass conductivity coefficient is made according to the equation obtained from Fick’s first law. As an approbation of the proposed method, we carried out studies on the mass conductivity coefficient of larch wood during the extraction of dihydroquercetin from it with a water-ethanol extractant and arabinogalactan with distilled water. As a result of experimental data processing, mathematical dependences of the larch mass conductivity coefficient during the extraction of dihydroquercetin and arabinogalactan on the process temperature were obtained, which can be used in mathematical modeling in order to optimize the operating parameters of the process.
Software for measurement uncertainty assessment and actual metrological characteristics of viscometers
Authors: Sh M Masharipov 
Published: December 2022

Abstract
The issue of implementation of software for rapid assessment of uncertainty of metrological control results of measuring instruments used in the field of state metrological control and supervision in calibration and evaluation of actual metrological characteristics of operating viscosimeters was considered. An interpretation of the application of the EXCEL program and other software for the special methodology for automating uncertainty calculations developed by us was carried out, which significantly simplified the work and reduced the time spent by specialists in the metrological laboratory. Basic requirements of comparison of software for calculation, calculation and estimation of uncertainty in the realm of mathematical models of validated techniques are determined. The experimental results of the comparative analysis taking into account the set tasks are presented, the most common and effective universal software for calculating the uncertainty of the results of the experiment. The object of the study is universal software for estimating the uncertainty of measurements and other metrological characteristics of viscometers, structured by types of measurements, in the graphic programming environment. The software can be used both in laboratories and in industrial premises. The workplace can be both a metrological laboratory, the working area of which is a table with instruments, and a production room. As a rule, accredited laboratories do not have a special staff of metrologists or specialists who perfectly understand the basics of mathematical statistics and the concept of measurement uncertainty. The complexity and necessary amounts of calculations that are carried out in assessing the uncertainty of measurements require significant laboratory resources.
Transmission and slewing mechanism for highly manoeuvrable small machine transmissions
Authors: Yu Dobretsov R , Ivanov A A , Nuretdinov D I , Malyukova M A , Malyukov S V , Ye Ariko S , Churakov A V 
Published: December 2022

Abstract
A variant of the electromechanical transmission scheme for mobile platforms of small mass, designed primarily for operation in an organized artificial environment under the conditions of dimensional restrictions, is proposed. Typical examples of such environments are greenhouses, gardens and parks. Distinctive features of the proposed transmission are the use of a single traction motor and a power distribution mechanism that allows the use of two modes of side turn: in the range from a given minimum radius to infinity and turning around the center of gravity. The transmission scheme, with some changes, can be extended to mobile chassis of a larger mass - tractors of various traction classes, forestry machines, loaders, mobile robots, etc.
Computational approach to the structure spectral analysis of GERT-network models of mobile object monitoring systems
Authors: Kovalev I V , Kovalev D I , Testoyedov N A , Golovenkin E N , Voroshilova A A , Shatrov A K , Borovinsky D V 
Published: December 2022

Abstract
The paper considers the application of the computational approach to the structure spectral analysis of GERT-network models of mobile object monitoring systems. The structure of the system for monitoring mobile objects using satellite communication channels is presented, in particular, the structure of the system for monitoring the flight path of aircraft. It is shown that the structure of monitoring systems can be represented as a GERT-network model, which allows at the initial stage to consider various options for the formation of interaction between a mobile object, for example, a manned or unmanned aerial vehicle, and a ground control complex. The main idea of the approach is to transform a known graph into a graph with the desired spectrum, which corresponds to a valid implementation of the GERT network graph. Obviously, the set of admissible implementations also includes a graph with the maximum probability of completing the process in a given time. The results are presented, which allow, when analyzing the GERT-network structure of a monitoring system, to assess, by fairly simple methods, the compliance of a structure variant with a number of requirements that apply to the system as a whole.
Reduction of time series forecast variance by the case of ArDL(p, q) models
Authors: Petrusevich D A 
Published: December 2022

Abstract
Combination of time series forecasts or time series models is often considered nowadays in various research papers and is usually a good technique in practice. Still it has got weak theoretical explanation and there’s a lot of work that is going to be done in this field. In the research optimal combination of forecasters in terms of minimal variance is investigated. These results don’t depend on nature of combined models but in the practical part ArDL models describing connections between pairs of time series are considered. Weighted sum of models’ predictions is used as a new prediction with variance that should be less than individual models’ predictions variance. Optimal weights for combination of two models are calculated theoretically. They are based on correlation of combined models and their forecasts’ variance. Optimal model combination variance (variance of the combined models with optimal weights) has been investigated and it has been shown that it doesn’t exceed variances of the combined models. Practical experiments and conditions under which combined time series model is expected to improve forecasts of original ones are in scope of this research. Forecasts of two ArDL models are combined in order to construct forecast with lower variety. This approach can be used in case of more models but theoretical expression of optimal weights is going to be a part of further research. Russian macroeconomical time series statistics and economic data of the USA are used as experimental time series. Combined models have got predictions close to the forecasts of the best models and better than the worst models used in combinations. It’s shown that optimal combination should make predictions of high quality if combined predictors describe different aspects of investigated time series and correlation of their forecasts isn’t very high. Otherwise, it turns into mean forecast of two models.
Application of pseudoinverse matrices in optimal terminal control problems of linear discrete systems
Authors: Matvienko V T , Filimonov A B , Filimonov N B 
Published: December 2022

Abstract
The problem of linear-quadratic optimal terminal control of a linear discrete dynamic system with a vector input is considered. Solutions of the problem based on the apparatus of the optimization form of pseudo-circulation of matrices are given. The solution of the optimal terminal control problem is obtained, which ensures the achievement of the terminal control goal and the passage of the trajectory of the system as close as possible to the specified intermediate points. A complete set of solutions to the problem of optimal terminal control of a bundle of trajectories is obtained.
Exploring the current state and application of quantum computing
Authors: Magomadov V S 
Published: December 2022

Abstract
This paper is focused on the field of quantum computing which is an important area of research these days. The paper gives a brief history of this phenomenon and discusses how it has been developing since its conception. Furthermore, the paper describes the principles on which the quantity computer is built, such as qubits, entanglement, and superposition. It also discusses the necessity to build a quantum computer and how it could an improvement upon the existing computers. In addition, the paper covers some of the fields in which quantum computing could be particularly beneficial. Finally, some of the problems and challenges associated with the development of quantum computing are addressed.
Interaction of two-frequency electromagnetic waves with anisotropic media over hydrocarbon accumulation
Authors: Yanushkevich Viktar F , Dauhiala Dzmitry A , Adamovich Aliaksandr L , Abramenka Siarhei N , Kalintsau Siarhei V 
Published: December 2022

Abstract
The article analyzes the interaction of two-frequency electromagnetic waves with anisotropic media over hydrocarbon accumulation. The behavior of the real component έ3 of the dielectric permittivity tensor is investigated. The choice of signal characteristics is based on the use of different electromagnetic wave emission sources with amplitude and frequency ratio coefficients in the modes of powerful low-frequency and high-frequency signals. The dielectric permittivity tensor component έ3 as a function of dielectric permittivity and frequency of sounding signals was analyzed. Sounding modes of anisotropic media over hydrocarbons are recommended to identify the medium over the deposits and increase the accuracy of determining the boundaries of hydrocarbon accumulation. The obtained results of the research can be used in prospecting geophysics.
Method for measuring and analyzing the complexity and safety of air traffic control
Authors: Yu Filimonyuk L 
Published: December 2022

Abstract
The research proposes a method for measurement and assessing the complexity and safety of air transport systems by comparing the complexity of given air itineraries. The specified complex of dynamic characteristics of the sequence is designed as a formal basis of the method for itineraries’ analysis. The method is illustrated by an example of comparing air trajectories according to different criteria.
Construction of maps for dynamic modes and bifurcation diagrams in nonlinear dynamics using the Maple computer mathematics software package
Authors: Parovik R I , Yakovleva T P 
Published: December 2022

Abstract
The paper considers algorithms for constructing maps of dynamic regimes and bifurcation diagrams in nonlinear dynamics using the example of some oscillatory systems and discrete mappings. The work is educational and methodical and can be used in the educational process when studying the disciplines “Nonlinear dynamics” and “Theory of oscillatory systems”.
Metrological characteristics of solar evaporative coolers
Authors: Murodov J N 
Published: December 2022

Abstract
The metrological characteristics such as the temperature and relative humidity of the cooled air in solar evaporative coolers in the form of an umbrella or awning are experimentally investigated in the work. Hygroscopic material was used for evaporative cooling. The results are compared with the data obtained from the waterproof material. They allow us to conclude that solar evaporative cooling is promising as an ecologically pure method for cooling air in open areas under canopies.
Characteristics of anisotropic media over hydrocarbons in the mode of frequency-modulated signals
Authors: Yanushkevich Viktar F , Dauhiala Dzmitry A , Maladzechkina Tatiana V , Kalintsau Siarhei V , Bogush Vadim A 
Published: December 2022

Abstract
The article considers the impact of frequency-modulated signals on an anisotropic medium over oil and gas deposits. Modeling of the components of the tensors of the dielectric constant of the medium over hydrocarbon deposits was carried out. The characteristics of the medium over accumulations of hydrocarbons for frequency-modulated signals from the frequency of the carrier oscillation, the frequency modulation index for the right and left polarizations of electromagnetic waves are studied. Methods of searching for hydrocarbons based on the variation in the characteristics of the applied signals are recommended. It is proposed to introduce new search modes to improve the accuracy of determining the boundaries of hydrocarbon deposits. The influence pattern of the dielectric constant of an anisotropic medium on the real and phase components of the tensor components are established. The research results can be applied in the electrical exploration of minerals.
Using a training stand to gain skills in measuring FOCL parameters
Authors: Dmitriev Alexey , Shibaeva Margarita 
Published: December 2022

Abstract
This article is devoted to the problems of engineering education in a technical higher educational institution. In particular, obtaining an insufficient amount of practical skills and abilities in the field of systems, networks and telecommunications. This article discusses the acquisition of practical experience in the measurement of various parameters of fiber optic communication cables using measuring instruments to control the fiber optic line. For a visual demonstration of the possibility of carrying out laboratory work on this stand, the identification of the influence of connectors at the ends of fiber-optic patch cords on the operation of the line is considered. All this became possible thanks to the creation of a training stand, which is designed to train students in the specialty “Infocommunication Technologies and Communication Systems”, and the like.