bluuebunny/crossref_metadata_2025_split huggingface dataset:
Measuring parameters of canvas texture from images of paintings obtained in raking light
Authors: Murashov D M , Berezin A V , Ivanova E Yu 
Published: November 2019

Abstract
In this work, the problem of threads counting in images of canvases of paintings is considered. Counting of threads is necessary for measuring canvas density and a number of other parameters used by art historians for dating the artworks. We propose to use raking light in the image acquisition process in order to emphasize canvas texture. We modify and adapt known techniques developed for inspecting fabrics in the textile industry. Three threads counting algorithms based on filtering in the Fourier domain and thresholding techniques are proposed and tested. These algorithms for measuring the canvas density from images taken in raking light are efficient in cases when lead white has been used to create the painting, and the analysis of canvas images acquired in X-rays and transmitted light is ineffective. The results of the experiment show that the accuracy of the proposed threads counting algorithms is comparable to the accuracy of known techniques.
Elimination of information redundancy of hyperspectral images using the “well-adapted” basis method
Authors: Vasin D Yu , Gromov V P , Pakhomov P A 
Published: November 2019

Abstract
The paper considers some issues of eliminating information redundancy of hyperspectral images (HSI). The characteristic properties of the HSI are listed, a brief description of the existing HSI compression methods is given. The possibility of using local, homogeneous “well-adapted” basis functions (LHWABF) to eliminate information redundancy and adaptive compression of the HSI is considered. An algorithm for constructing a LHWABF system for the HSI based on the Chebyshev approximation is proposed. The results of computational experiments, including the use of a graphics processor, are presented. The effectiveness of the proposed method of adaptive compression HSI is shown.
An approach for configuration of the equivalence relation
Authors: Dmitriev E A , Myasnikov V V 
Published: November 2019

Abstract
This paper presents an approach for feature extraction using the equivalence relation. The equivalence relation is formed using features permutations of primary data. Every feature of new representation matches to optimal permutation, that minimizes some loss function. A loss function choice depends on the kind of problem. In this paper, we consider copy-move forgery detection problem and demonstrate the effectiveness of our approach in solving this problem.
For the Jubilee of Vladimir Mikhailovich Chernov
Authors: Labunets V G , Smetanin Yu G 
Published: November 2019

Abstract
On April 25, 2019, Vladimir Chernov celebrated his 70th birthday, Doctor of Physics and Mathematics, Chief Researcher at the Laboratory of Mathematical Methods of Image Processing of the Image Processing Systems Institute of the Russian Academy of Sciences (IPSI RAS), a branch of the Federal Science Research Center “Crystallography and Photonics” RAS and part-time Professor at the Department of Geoinformatics and Information Security of the Samara National Research University named after academician S.P. Korolev (Samara University). The article briefly describes the scientific and pedagogical achievements of the hero of the day.
Modeling and comparative analysis of schemes for returning a payload using a space tethered system
Authors: Dong Z , Zabolotnov Y M , Li A J , Wang C Q 
Published: November 2019

Abstract
The multiple schemes for returning a payload from LEO using a space tethered system are designed and analyzed in this paper. The space tethered system consists of a main spacecraft, a tether, a returning capsule with the payload (or space debris) and an atmospheric probe. The simulation for the motion of the tethered system is based on a mathematical model with distributed parameters, in which the tether is considered as a sequence of point masses with one-sided elastic mechanical coupling. The aerodynamic forces acting on all parts of the tethered system including on the tether are considered in this work. The atmospheric probe is used as an additional braking device for the proposed schemes for returning the payload.
Modeling of non-stationary processes in the study of liquid media by the method of nuclear magnetic resonance in a weak field
Authors: Rukin E V , Myazin N S , Davydov V V , Dudkin V I , Rud’ V Yu 
Published: November 2019

AbstractThe article substantiates the necessity of developing a theoretical model to study the influence of non-stationary processes on the shape of the recorded NMR signal in a weak magnetic field. Therefore, comparison of different ways of solving Bloch’s equations to describe the shape of the recorded NMR signals using a modulation technique is carried out. Moreover, mathematical models have been developed to describe the shape of the NMR signal, considering the peculiarities of its registration using modulation techniques in a weak field. Finally, the results of calculations, obtained by proposed methods, are compared with experimental data.
Multiobjective optimization of a temperature mode in a reactor unit of gasoline catalytic reforming based on a kinetic model
Authors: Koledina K F , Zaynullin R Z , Koledin S N , Akhmetov A F 
Published: November 2019

Abstract
Based on the previously developed kinetic model of gasoline catalytic reforming, the temperature regimes of gasoline catalytic reforming are optimized. Several target optimization functions are considered — yield of the main product required octane number with a restriction to benzene content (high-octane component, <2% by volume), etc. The proposed two-objective optimization problem for catalytic reforming of gasoline was solved with the Non-dominated Sorting Genetic Algorithm II (NSGA-II) in Matlab software environment The optimal inlet temperatures of the reaction mixture are determined for each reactor.
Mathematical modeling of the synthesis reaction benzyl butyl ether
Authors: Koledina K F , Koledin S N , Vovdenko A G , Bayguzina A R , Khusnutdinov R I 
Published: November 2019

Abstract
On the basis of experimental data obtained at different temperatures, a mathematical model of synthesis of benzylbutyl ether by intermolecular dehydration of benzyl and n-butyl alcohols under the influence of the catalyst CuBr2 is proposed. Optimization of the kinetic parameters of the catalytic synthesis of benzylbutyl ether is solved by genetic algorithm using the island model of parallelizing the computational process. As a result of the simulation, the values of the rate constants and activation energies of the stages are determined at different temperatures of the reaction. Thus, the developed mathematical model within the limits of the permissible error allows adequately describing the experimental data.
Assessment of the view area of parachuted radio monitoring system and stabilization of flight under wind forcing
Authors: Voskoboynikov M A , Podstrigaev A S , Davydov V V 
Published: November 2019

Abstract
The paper describes a method of modelling the influence of wind on the parachuted radio monitoring system. The computer simulation is carried out using Matlab Simulink with the possibility of changing the coefficients in the process of integrating differential equations. The wind speed in the model is set in the signal generators. This allowed us to get the modelling results with a variety of wind effects. The time dependences of the angular deviation of the antenna beam from vertical with wind influences were obtained. The estimation of the radio monitoring equipment view zone on the Earth surface was obtained based on them. The recommendations for flight stabilizing of parachuting system are given with quantitative assessments.
Methodology and software for estimating target efficiency of land remote sensing satellites at the stage of design
Authors: Kurenkov V I , Kucherov A S 
Published: November 2019

Abstract
The paper aims to present the software developed with the purpose of estimating land remote sensing satellites and space monitoring system target efficiency indices. The essence of the approach is step-by-step simulation of the satellite orbital motion with permanent determination of the flight conditions and estimation of the satellite and the space monitoring system target parameters. Main factors affecting target efficiency are taken into consideration; they include orbital elements and the satellite coordinates variation while its orbital movement, the satellite manoeuvres in the process of its target operation, conditions of survey objects taking, characteristics of survey equipment, etc. The algorithm used is based on a number of mathematical models such as models for generating initial data on survey objects, models for choice of survey objects within the satellite swath, models for constructing land remote sensing satellites survey path, models for estimating orientation of solar cell battery panels, etc. The software has been developed in Delphi programming support environment. It enables calculation of satellites target parameters such as ground resolution, operational efficiency, surveillance frequency, productivity.
Mathematical modelling and numerical study of recirculation membrane and membrane-refrigerated systems of compressed air dehydration
Authors: Laguntsov N I , Tikhonov S N , Karaseva M D , Tishin A A 
Published: November 2019

Abstract
Mathematical modeling and numerical investigation of the process of drying compressed air was carried out in a hybrid membrane-refrigeration system, which consists of a compressor with a receiver, a Peltier refrigerator, and a gas separation membrane module. This system allows you to get dry air, dried to a dew point of -50°C and below without loss of compressed air since only condensed water is removed from the system. It is shown that reduced energy consumption decreases with increasing compression pressure. A comparison of the hybrid membrane-refrigerator system with a single-module membrane system has been carried out, the advantages of the hybrid system are shown.
Modified Lorenz-Malkus water wheel model: dry friction versus chaos
Authors: Karpov E A , Semenov M E , Meleshenko P A , Klinskikh A F , Pervezentcev R E , Glazkova M Yu 
Published: November 2019

Abstract
In this paper, we propose a model of the water wheel under dry friction (the modi ed Lorenz-Malkus system). Dynamical features of this system are investigated and analyzed depending on the dry friction parameter. Particularly, we present the analysis of stationary points, Lyapunov exponents, bifurcation diagrams, and stochastic properties of the considered system. Based on the results of numerical simulations we showed that the dry friction may serve an effective mechanism to control the chaotic dynamics.
A parallel algorithm for the simulation of controlled motion of space tether systems
Authors: Zhidchenko V V , Kovartsev A N 
Published: November 2019

Abstract
Simulation of the controlled motion of space tether systems differs significantly from the free motion case. Tether deployment increases its length and adds new points into the discrete model of the tether. A set of dynamic equations is expanded with equations that describe the motion of the new points. The necessary condition at each step is the consistency of the system. Tether deployment is supervised by the control system which limits the tether length. The problem arises of solving a system of differential equations with variable and increasing number of equations. In this paper a parallel algorithm for simulating the controlled motion of space tether systems is designed. The parallel algorithm provides an ability to split the tether to such number of points that the model becomes similar to the model with distributed parameters. As a result, the simulation of several modes of tether motion unavailable for other methods becomes possible. The estimation of speedup provided by the algorithm is implemented. It shows that the speedup is comparable with the more simple case of the free motion simulation. Computational experiments have been carried out for the algorithm performance evaluation.
Representation of the process of oxidative regeneration of coked catalysts in a fixed layer based on graph theory
Authors: Islamova G I , Davletova M R , Dubinets O V 
Published: November 2019

Abstract
Representation of processes by means of graphs allows increasing their visibility in comparison with the technological scheme. This makes it possible to facilitate the design of chemical plants, especially in the case when going from the principal graph to more complex graphs of the same production. The presented representation of chemical technology processes based on graph theory is of a purely qualitative nature. The article shows the technological scheme and the resulting graph of the process of oxidative regeneration. Quantitative regularities derived from this theory can form the basis of optimization of the oxidative regeneration.
Modelling of sprays: simple solutions of complex problems
Authors: Sazhin S , Shchepakina E , Sobolev V 
Published: November 2019

Abstract
Some new approaches to the solution of complex problems, focused on spray modelling, using relatively simple mathematical tools are briefly summarised. The following problems are considered: modelling of spray drying with pharmaceutical applications, modelling of heating and evaporation of suspended droplets with applications to water sprays for fire suppression, modelling of micro-explosions with automotive applications, and parameterisations of slow invariant manifolds with applications to spray ignition modelling. The modelling of spray drying is based on the assumption that the array of small suspended solid particles inside droplets can be treated as a non-evaporating liquid component. The modelling of the effect of a support rod on droplet heating and evaporation is based on the assumption that this heat is homogeneously distributed inside the whole volume of a droplet. In the modelling of a puffing/micro-explosion it is assumed that a water sub-droplet is located exactly at the centre of a fuel droplet and the temperature at the surface of the fuel droplet is fixed. In the presentation of slow invariant manifolds in parametric form these manifolds are found using asymptotic expansions.
Critical travelling wave solution in one singularly perturbed parabolic equation
Authors: Shchepakina E , Sobolev V , Zhang L 
Published: November 2019

AbstractIn the paper, we consider a new type of travelling waves, a profile of which is a pure slow heteroclinic canard. To construct the profile we use the so-called canard cascade. Such travelling waves are critical because they are a watershed between travelling waves of different types and simulate critical phenomena in various applied problems.
Identification of exponential trend models with fractional white noise
Authors: Ivanov D V , Chertykovtseva N V , Terekhova (Zharkova) A A , Andreeva E A 
Published: November 2019

Abstract
The paper suggests algorithms for identifying parameters of exponential trend models in the presence of fractional white noise. The paper considers three types of models that are solutions of a homogeneous linear differential equation of the second order. Identification of the solution of a differential equation makes it possible to increase accuracy by taking into account a priori information about the nature of the roots of the differential equation and initial conditions. However, identification of the solution is fraught with difficulties due to nonlinearity in the parameters of the obtained solutions. Two-step algorithms are proposed, allowing to determine the estimates of the parameters of the considered trend models. Test examples showed high accuracy of the estimates obtained using the developed algorithms.
Computational and experimental study of mixed mode loading of the cracked semi-circular disc under bending
Authors: Stepanova L 
Published: November 2019

Abstract
Numerical and experimental works are performed on the mixed-mode I/II brittle fracture by two types of edge cracked semicircular bend specimens. The first type is edge cracked semi-circular bend (SBC) specimens with vertical and inclined notches. The second type of specimens is semi-circular samples in which the contribution of mode I and mode II components varies by changing the bottom loading support. In the test numerical program fracture tests were conducted at crack inclination angles of 0, 10, 45, 49, 50, 80 degrees. The stress intensity factors for Mode I and Mode II loading and T-stresses are obtained numerically in FEM package SIMULIA Abaqus/CAE. The results of FEM modeling are compared with the experimental results obtained by the photoelasticity method. The experimental approach based on the photoelasticity method allows us to observe the von Mises equivalent stress distribution in the whole specimen and confirm the FEM studies performed. The comparison shows that in the specimens the pure mode II loading can’t be realized. Analysis of numerical studies and the isochromatic fringe patterns allows us to conclude that in the semicircular disc the mixed mode loadings are realized for all angles from 0 to 85 degrees. The pure mode II or sliding fracture can’t be created by so- called mode II loading in disc-type specimens SCB, because there are opening displacements observed for all the specimens investigated numerically and experimentally.
Microstrip antenna design for arrays generating OAM mm-wave radio signals
Authors: Abdrakhmanova G I , Grakhova E P , Voronkov G S , Bagmanov V Kh 
Published: November 2019

Abstract
The paper is devoted to the development of the single antenna as an element of the array, intended for radiating electromagnetic fields with different orders of the orbital angular momentum (OAM) in the band 77 ÷ 78.5 GHz. Multiplexing by OAM provides more opportunities for safe data transmission and increases the quantity of the simultaneously transmitted channels. The antenna design takes into account the special requirements for its structure, imposed by its practical usage in the array. The modeling process includes calculating the dimensions, selecting the suitable materials (Rogers RO 3003) and components, simulating with the software and analyzing the following characteristics: VSWR, return loss S11, input impedance, and radiation pattern. The designed antenna’s configurations correspond to a half-wave dipole, fed by coplanar waveguide port and matched to 50 Ohm impedance. The VSWR for all cases is less than 1.8, the radiation pattern is quite wide. The shape and size for the proposed antennas provide an easy combination of such elements in the array, including the issues of the feeding lines simplicity. The application areas are described.
Mathematical simulation of the process of putting a connective insert into the orifice in a three-layered composite structure
Authors: Vashukov Yu A 
Published: November 2019

Abstract
This article provides the reader with the mathematical model determining the dependence of design parameters of embedding of a connective insert in a three-layered composite structure on its strained state at the outer diameter. Insert material is assumed to be a plastic body with nonlinear hardening. The model is adapted for implementing in the standard finite-element software ANSYS Mechanical used for numerical simulation of the process of embedding of the connective insert.
Mathematical modeling of geometrical and electrical characteristics of island films growth initial stages
Authors: Isaeva A A , Sidorova S V 
Published: November 2019

Abstract
The metal island nanostructures application fields in science and technology are presented. Experimental studies were carried out using the UVN-1M vacuum unit to test the metal thin films formation modes. Presents the control principle at the initial stages of growth of the tunneling current change between the island thin films. A series of copper and aluminum ITF samples were obtained. The derived samples thicknesses were measured using an atomic-force microscope, as a result, the dependence of the geometric and electrical characteristics of thin films and island nanostructures on the process parameters were simulated.
Mathematical simulation of particle impact on a fixed surface in the formation of powder coatings
Authors: Bogdanovich V I , Giorbelidze M G 
Published: November 2019

Abstract
The article deals with the process of elastic and plastic-elastic deformation of the particles during forming of the coating layer. Mathematical model of the process of impacting of powder particle on the fixed surface has been developed. Influence of material properties, kinetic and thermal parameters of deposition on the particle deformation has also been considered.
Modeling heat transfer in a supercritical carbon dioxide flow with greatly variable thermophysical properties
Authors: Chirkov A Yu , Luo T , Egorov K S 
Published: November 2019

Abstract
A mathematical model of carbon dioxide isobaric flow under supercritical pressure in the condition of a constant heat flux on the surface of a cooled pipe is discussed. Criterion dependencies for heat transfer are analyzed. The effect of greatly variable heat capacity is shown. A method has been developed for taking this factor into account in numerical calculations. Areas are found with the so-called degraded heat transfer.
Developing a microscopic city model in SUMO simulation system
Authors: Maiorov E R , Ludan I R , Motta J D , Saprykin O N 
Published: November 2019

Abstract
Modern high rates of urbanization affect the economic and social processes in cities around the world. One of the main problems in cities is the weakness of transport systems. To solve this problem, it is necessary to use specialized software for modeling, in consequence of the fact that there is no possibility to influence the situation in real time. The main problem in creating a transport model of cities is the lack of data on the mobility of residents. The aim of this work is to develop a method and software for automated creation of microscopic models of cities using open data. We propose the processing pipeline that consumes the open data about city population and transport infrastructure and produces routes for agents of microscopic simulation. The developed method was implemented using the Python programming language in the Zeppelin interactive environment. The software was tested on data from the city of Samara (Russia). The obtained results show acceptability of proposed method and possible ways to improve the accuracy of the model.
Simulation and optimization of the cargo terminal in the AnyLogic environment
Authors: Mokshin V V , Kirpichnikov A P , Soiko A I 
Published: November 2019

Abstract
The paper considers the formal theoretical bases of the analytical, simulation and optimization simulating of multi-channel queuing systems with waiting (with the unlimited and limited queue). The research is based on the use as an analytical platform of the simulation environment AnyLogic, which allows us to carry out simulation and optimization experiments, as well as perform parametric analysis of solutions and studies on sensitivity. Practical approbation of models is based on solving and researching a wide range of tasks on simulating queuing systems with an expectation from different subject areas. The basis of the methodology used for modeling and optimization is the provision of using as an optimization criterion (objective function) the total reduced costs in both service channels and queue losses. The research is aimed at reviewing and analyzing queuing systems with various event flows in the AnyLogic simulation environment.