bluuebunny/crossref_metadata_2025_split huggingface dataset:
Axisymmetric hydrate monolith destruction problem
Authors: Stolpovsky M V , Chiglintseva A S , Davletshina M R 
Published: November 2021

Abstract
A mathematical model is proposed for the destruction of a methane hydrate monolith containing gas inclusions. In this formulation of the problem, it is assumed that there is a cylindrical cavity inside the hydrate monolith, initially filled only with methane. Since the conditions on the surface of the particle correspond to the conditions for the free existence of gas and water, the gas hydrate begins to decompose. On the basis of the obtained system, consisting of the equations of conservation of mass and heat, the temperature distributions in the “cavity - gas hydrate” system were obtained, and the influence of the initial temperature of the system and the temperature in the cavity on the dynamics of hydrate decomposition was analyzed.
On the question of finding a universal mechanism for the transmission of sound wave energy in iron during heating and deformation
Authors: Yurchenko Stepan A 
Published: November 2021

Abstract
The paper presents a theoretical analysis of the experimental data on the ultrasound speed change in iron during heating and elastic deformation. The mathematical models proposed for assessing the change in the ultrasound speed based on the “adiabatic approximation” method do not explain, using one model, the change in the ultrasound speed in iron during heating and elastic deformation. During theoretical analysis, a new model of ultrasound wave transmission has been proposed, in which the wave energy propagates in the volume of the interatomic bond, namely in the loop, which is formed by the “collectivization” of valence electrons located in the outer orbit of atoms. The new model explains why with an increase in the interatomic distance a, the crystal lattice parameter, and an increase in the natural vibration frequency of atoms Vat
during heating and elastic deformation, in one case (heating), the speed of the sound wave decreases, but in the other case (elastic deformation), the speed of the wave increases with a general decrease in the temperature of the rod.
Shape measures for the generalized beta exponential distribution
Authors: Polosin V G 
Published: November 2021

Abstract
This paper contains parametric and informational shape measures for various families of the generalized beta exponential distribution since it is important to determination of the distribution shape for analysing an experimental data set. A logistic parameter is used to select independent types of beta exponential distributions, that it allows to combine the distributions of different subfamilies. In this paper the use of parametric shape measures to pre-define distribution shape is discusses. In particular, the initial and standard central moments for the main types of generalized beta exponential distribution are given. In the paper it is proposes to use the entropy coefficient of unshifted distribution as an independent information measure of the shape of unshifted generalized beta exponential distributions. In order to increase the reliability of the preliminary determination of the shape of the model, expressions for the entropy coefficient of shifted families both the generalized beta exponential distributions of the first and second types, and the generalized gamma exponential distribution were obtained. For practical applied the entropy coefficients of unshifted distributions for various subfamilies of generalized beta exponential distributions can be useful.
Algorithms for monitoring the functioning of nonequilibrium information processing systems
Authors: Antsyferov S S , Fazilova K N , Rusanov K E 
Published: November 2021

Abstract
The authors have developed an algorithm for monitoring the functioning of nonequilibrium systems, which is based on such operations as establishing the range for permissible values of efficiency probabilities of structural elements functioning, establishing permissible values of structural elements amount, plotting the system entropy dependence on structural elements amount and their effectiveness probability, constructing phase space of the system functioning and determination of the boundaries of regions with nonequilibrium stability. Practical testing of the developed algorithm for monitoring the functioning of nonequilibrium systems has shown that this algorithm can be used to solve several practical problems related to functioning monitoring and predicting the state of a wide variety of nonequilibrium systems.
To calculate the axial dimensions of inkjet devices for hydraulic transport of sand and gravel materials
Authors: Medved N V , Egorova E L , Morozov V N , Gron V A , Galaiko A V 
Published: November 2021

Abstract
The article presents the results of the dredger in a deep deposit of sand and gravel materials. It was found that when the diameter of the suction pipe exceeds the diameter of the inlet mixing chamber by 150 mm, the actual pressure from the ejector does not exceed one meter, and with an increase in the supply of the suction pump as a result of a sharp jump in hydraulic resistance, the vacuum is disrupted. It was also found that the effect on the calculated compression ratio of the jet apparatus increases with an increase in the injection coefficient and the input velocity of the injected stream.
Electro-optic Q-switched Cr:LiSAF laser
Authors: Popov E E , Sergeev A A , Pogoda A P , Petrov V M , Boreysho A S 
Published: November 2021

Abstract
We demonstrate electro-optic Q-switched solid state laser with Cr:LiSAF active medium. A single 50 ns pulse with 14 mJ of output energy is demonstrated. Simultaneous generation of several peaks with a step of 1.4 nm within the spectrum envelope with a full width at half maximum of 10.3 nm is demonstrated. For an electro-optic Q-switched mode a Pockels cell is used. Demonstrated laser can be used in differential absorption lidar systems.
Correlation length critical exponent as a function of the percolation radius for one-dimensional chains in bond problems
Authors: Yakunina T V , Udodov V N 
Published: November 2021

Abstract
A one-dimensional lattice percolation model is constructed for the problem of constraints flowing along non-nearest neighbors. In this work, we calculated the critical exponent of the correlation length in the one-dimensional bond problem for a percolation radius of up to 6. In the calculations, we used a method without constructing a covering lattice or an adjacency matrix (to find the percolation threshold). The values of the critical exponent of the correlation length were obtained in the one-dimensional bond problem depending on the size of the system and at different percolation radii. Based on original algorithms that operate on a computer faster than standard ones (associated with the construction of a covering lattice), these results are obtained with corresponding errors.
Microstructure and crystallographic texture of Cu-Zn alloys subjected to ECAP and flat rolling
Authors: Zaynullina L I , Alexandrov I V 
Published: November 2021

AbstractThis paper presents the results of the microstructure and crystallographic texture investigations of the Cu-Zn alloys system with different stacking fault energies (SFE) subjected to severe plastic deformation (SPD) by equal channel angular pressing (ECAP) and subsequent flat rolling. It is shown that ECAP leads to the formation of an ultrafine-grained (UFG) structure. Further flat rolling is accompanied by a decrease in the size of structural elements and the formation of nanoscale twins, which are more likely to be detected in an alloy with a lower SFE. As the deformation degree increases, the main crystallographic textures components of the investigated alloys become Brass and Goss components.
Application of vectorized algorithms for solving problems of continuum mechanics
Authors: Emelyanov V N , Brykov N A , Efremov A V 
Published: November 2021

Abstract
The paper discusses the possibilities of constructing vectorized algorithms for solving problems of continuum mechanics, as well as the specialties of their software implementation in the MATLAB. These algorithms, on the one hand, widely use MATLAB functions designed to treat vectors and sparse matrixes, and on the other hand, are distinguished by high efficiency and counting speed.
On digital phase detector
Authors: Chernoyarov O V , Glushkov A N , Golikov A A , Litvinenko V P , Mironov V A 
Published: November 2021

Abstract
A digital phase detector for processing signals with phase modulation in a wide range of changes in the phase of the received signal is considered. A block diagram of a digital detector with minimal computational costs for the signal period is proposed. The problem of phase jumps when it changes by more than 2π is solved. An estimate is obtained for the noise immunity of a phase detector when exposed to Gaussian noise. Supposed hardware implementation of a phase detector based on field-programmable gate arrays. It can be used in devices for digital processing of the angular modulation signals, devices for controlling the phase of the reference signal and in different measurers.
Influence of digital technologies on the quality of life by modelling the risk of flooding of territories by flood waters
Authors: Grebnev Ya V , Moskalev A K , Shagidulina D I 
Published: November 2021

Abstract
Every year, there are many floods on the planet, which have a significant impact on ensuring the safety of people and affects the quality of life. The development of modern modelling technologies makes it possible to predict various scenarios for the development of the situation and reduce the likelihood of negative consequences. This issue is especially relevant for settlements located in the immediate vicinity of hydroelectric power plants, since by regulating discharge costs from hydroelectric power plants, it is possible to safely pass flood waters avoiding flooding of residential buildings and infrastructure, but this requires knowing the flooding zones at different water levels and discharge costs. This paper presents the results of solving the problem of modelling the dynamics of flood waters within the boundaries of the settlement of Krasnoyarsk. To calculate the flooded areas, the TUFLOW program was used in the Surface-water Modelling System modelling environment, as well as neural network forecasting using the NeuroPro software product. The simulation results made it possible to predict local flooding of the settlement during the flood of 2021 and take preventive measures to reduce the risk of flooding.
On thermal processes in the calibration and control of liquid calorimeters for measuring the energy of high-power microwave pulses
Authors: Priputnev P V , Klimov A I , Kurkan I K 
Published: November 2021

Abstract
The heat transfer processes associated with the heating of the operating liquid and the calibration of the liquid calorimeters for measuring the energy of high-power microwave pulses are studied analytically and by numerical simulation. It is shown that convection significantly enhances heat transfer between the calibration and thermostabilization heaters and the operating liquid, hence, it helps to reduce the formation of bubbles in the volume of the operating liquid when controlling and calibrating the calorimeter. Heat transfer from tape heaters is noticeably more efficient than that from single wire ones. The results obtained are essential for the development of liquid calorimeters and the adjustment of their operating modes.
Determination of the effective porosity of a single filter fiber
Authors: Soloveva V , Solovev S A , Kharchuk S I , Belousova L A , Talipova A R 
Published: November 2021

Abstract
In this work, a numerical simulation of the aerosol motion when flowing around a single porous filter fiber with a diameter of 5 mm is carried out. The fiber is formed by a set of microfibers in a random arrangement. The size of the microfibers varies from 0.1 mm to 0.5 mm. For each fixed size of microfibers, a fiber model with different porosity of the medium was created. The porosity ranged from 0.7 to 0.9. The calculations were carried out in the ANSYS software package (v. 19.0). Studies have shown that a porous filter fiber model provides the maximum deposition efficiency for highly inert particles is provided by a porous filter fiber model with a microfiber size of 0.1 mm and a medium porosity of 0.9.
Synthesis of four new neuro-statistical tests for testing the hypothesis of independence of small samples of biometric data
Authors: Volchikhin V I , Ivanov A I , Zolotareva T A , Skudnev D M 
Published: November 2021

Abstract
The paper considers the analysis of small samples according to several statistical criteria to test the hypothesis of independence, since the direct calculation of the correlation coefficients using the Pearson formula gives an unacceptably high error on small biometric samples. Each of the classical statistical criteria for testing the hypothesis of independence can be replaced with an equivalent artificial neuron. Neuron training is performed based on the condition of obtaining equal probabilities of errors of the first and second kind. To improve the quality of decisions made, it is necessary to use a variety of statistical criteria, both known and new. It is necessary to form networks of artificial neurons, generalizing the number of artificial neurons that is necessary for practical use. It is shown that the classical formula for calculating the correlation coefficients can be modified with four options. This allows you to create a network of 5 artificial neurons, which is not yet able to reduce the probability of errors in comparison with the classical formula. A gain in the confidence level in the future can only be obtained when using a network of more than 23 artificial neurons, if we apply the simplest code to detect and correct errors.
Classification of movements based on wearable device data in biometric authentication
Authors: Grecheneva A V , Dorofeev N V 
Published: November 2021

Abstract
The paper proposes a neural network algorithm for classifying human movements according to the accelerometer data, which is located in a mobile device. Intelligent algorithms for classifying movement types (single step, walking, walking on stairs, running) are considered on 9 types of different movements that a person performs in everyday life. The developed algorithm is proposed to be used in biometric authentication systems based on mobile phone data.
The impact of communications channel bandwidth on the accuracy of pulse-width signal transmission
Authors: Prokofiev V , Golyshevsky O A , Savochkin A E 
Published: November 2021

Abstract
Pulse-width modulation (PWM) signals used in various areas are sent to the receiver through a communications channel that distorts their waveform due to the limitations of the frequency range. It is not always possible to reduce additive (fluctuation) noises that are also present within the PWM signal to negligible levels. Limiting the range of frequencies transmitted over a communications channel results in both the deterioration of PWM signal front slopes and the changes in the spectral specifications of the fluctuation noise. The simulation of pulse signal formation helped identify a correlation between the pulse front slope and the number of harmonic components transmitted over the communications channel. Through the analysis, we established a correlation between pulse time and the additive noise parameters along with the bandwidth of the real communications channel. These calculations might be useful for problems where it is necessary to formulate the requirements for the communications channel transmitting the PWM signal.
JASPER: a software for quantum chromodynamics Dyson-Schwinger equation numerical calculation
Authors: Semenov-Tian-Shansky K M , Vokhmintsev D A 
Published: November 2021

Abstract
The JASPER program is the first part of the high-performance computing information system for estimate some elementary particle properties, developing at Petersburg Nuclear Physics Institute. The JASPER is an implementation of the Dyson-Schwinger equation numerical solution for simple dressed quark propagator calculation in rainbow approximation. The Dyson-Schwinger equation solution with the Marice-Tandy Ansatz is one of several phenomenological approaches to obtain quantitative results in quantum chromodynamics (QCD) within strong coupling regime. The JASPER program is programmed in the C++ language and uses the numerical algorithms from the GNU Scientific Library (GSL). The numerical results for dynamical quark mass in complex Euclidean space were obtained. This result will be employed to study the hadron spectrum with the Bethe-Salpeter equation approach.
Technologies and implementation of an integration with geolocation and maps in mobile application development
Authors: Kalyuzhny E R , Krasnousov V M , Bukreev L V , Shpakovsky G A , Zarikovskaya N V 
Published: November 2021

Abstract
This article describes native and cross-platform technologies used to implement the functionality of geolocation and geographic maps in the development of mobile applications for iOS and Android platforms. The implementation for iOS platform using Swift programming language, for Android platform using Kotlin programming language and cross-platform implementation using Flutter framework are considered in detail.
Optimization of the task of forming a management system of hierarchical multilevel complex organizational systems
Authors: Zuev A S , Smolentseva T E , Isaev R A 
Published: November 2021

Abstract
A hierarchical configuration procedure in the process of analyzing the functioning of organizational structures using algorithms for solving problems using discrete programming methods is considered in detail in this paper. On the basis of the research, the authors propose a methodology for the combined application of an initial approximation algorithm with certain properties and an algorithm for a recursive procedure for a directed search for the optimal hierarchy, which, in the future, solving the traveling salesman problem in a minimum time much more efficient than using the methods of dynamic programming of branches and boundaries.
Temporal feature analysis method describing for automata models of computation systems
Authors: Sinev M P , Mitrokhin M A , Martyshkin A I , Doroshenko I N , Dubravin A V , Fedyashov M S , Gorynina A V 
Published: November 2021

Abstract
The paper reported the temporal feature analysis method describing for automata models of computation systems. The method is based on from source algorithm to modified algorithm expanding makes it possible to take characteristics of work process related to execution time measurement. The paper considers the transition method from source algorithm representation to modification a final state machine with additional states providing registration of temporal features. The paper demonstrates method usage example on computer system authorization algorithm, approves an algorithm complexity for features registration O(n) for n-states automata algorithm. The method can be used for a large class algorithm, but is recommended to apply it to an algorithm, separated on procedure thus mean of commands amount should be more than 500 for more time measurement accuracy.
Investigation of scheduling of circular request arrays by angle and level algorithms in grid systems
Authors: Kureichik Vladimir , Saak Andrey 
Published: November 2021

Abstract
The paper studies polynomial angle and level algorithms in terms of scheduling circular request arrays in the GRID systems. The suggested algorithms are analyzed on test arrays obtained from lining a square with stripes of smaller squares. The resulting heuristic measures of the resource wrappers of the level algorithm with the lack are not greater than 0.61, and the amount of error is not greater than 22%. In the GRID systems of centralized architecture, we can recommend the polynomial level algorithm with the lack for scheduling of circular request arrays.
Computational approach to solving the problem of optimizing the supply of raw materials and components at the enterprise
Authors: Mezentsev Y A , Baranova N V , Pavlov P S 
Published: November 2021

Abstract
The results of modelling the problem of supply management of an enterprise using discrete optimization tools are presented. The formulation of the optimization problem of supply management and the found method for its solution are presented. Since there may be cases when the number of variables in the problem is large enough, an algorithm was developed that uses the decomposition of the problem as a solution. A numerical example of the application of the decompositional algorithm for optimizing supplies and comparison of the results using the direct algorithm are given.
Equipment for connecting pipeline elements in oil and gas equipment using induction brazing
Authors: Panfilov I A , Antamoshkin O A , Bukhtoyarov V V , Agafonov E D , Eremeev D V , Vaitekunene E L 
Published: November 2021

Abstract
The article discusses the use of brazing and induction heating for connecting an oil and gas pipeline. The methodology of creating such compounds within the framework of the given problem is considered. The necessary equipment is considered and a schematic diagram of an induction heating device is created, as well as, as a result, a schematic process diagram of an induction soldering device is developed. An analysis and search for all possible solutions to this problem was made, and it was decided to focus on the use of induction soldering. The rationale for the use of induction brazing for such pipeline joints is considered. The application and development of an induction unit is proposed, which allows connecting pipelines for oil and gas equipment in order to increase the durability of the structure during operation at the facility.
Design of an induction brazing installation for connecting oil and gas equipment
Authors: Cherepanov A I , Kukartsev V V , Kuznetsov A V , Kravcova E G , Dokshanin S G , Stephanenko O S 
Published: November 2021

Abstract
The article is devoted to the design of a circuit diagram of an induction heating device. The work carried out a literature review in the area under consideration. The technology of manufacturing a union is considered, which consists of manufacturing a plug, a branch pipe and a flange. Conducted research and application of induction brazing and various fields. Various elements of the equipment used in the design process are considered. A schematic flow diagram of the induction brazing unit has been developed. As a result of the work, the design of the installation for induction soldering was developed and auxiliary materials (flux, solder) were selected.
Design of an electron beam welding installation based on the existing equipment for connecting pipelines without using a vacuum
Authors: Stupina A A , Panfilov I A , Antamoshkin O A , Vaitekunene E L , Fedorova N V , Eremeev D V 
Published: November 2021

Abstract
The article is aimed at solving the problem of connecting pipelines using electron beam welding. During the presented study, the analysis of the object of study - the main oil pipeline was carried out, during which the main shortcomings in the formed welded joints were identified. The authors also analyzed the methods of forming welded joints, which showed the advantages of electron-beam technology. The means of electron beam welding were selected: a generator, an electron beam gun. The electrical characteristics of the installation have been calculated, which make it possible to formulate the requirements for the purchased equipment. As a result, the authors have designed an installation for electron-beam welding of joints of the main pipeline elements, which makes it possible to form welded seams up to 400 mm deep and 1 mm wide.