bluuebunny/crossref_metadata_2025_split huggingface dataset:
Increased radioactivity during precipitation measured by the HiSPARC experiment
Authors: van Dam Kasper 
Published: May 2020

Abstract
HiSPARC is an extensive network of cosmic ray detection stations mainly across The Netherlands and United Kingdom. Its primary goal is to analyse cosmic ray air showers by sampling their footprints using multiple detectors. Also the detection rates per single detector are recorded. These 'singles rates’ fluctuate in time. Large fluctuations are caused by precipitation. During rain an excess of 222Rn daughter nuclei, scavenged by raindrops, falls to the ground. This results in an increase in the number of gamma rays from the decay of 214Bi. The excess of events can be described by a simple decay model that takes fluctuations of the rain intensity into account.
On spectral properties of one class difference operators
Authors: Baskakov A G , Garkavenko G V , Yu Glazkova M , Uskova N B 
Published: May 2020

Abstract
In this paper, we analyse basic facts of infinite matrix theory. We construct a similarity transform which allows one to represent matrices in a certain class of 5-th diagonal matrices of a difference operator in a diagonal or block-diagonal form. For such matrices, asymptotic estimates of eigenvalues and eigenvectors are obtained. Such matrices are considered in game theory. They are also used in the study fourth-order difference operators with growing potential. The problem of invariant subspaces is also considered.
Functional model of activity of the fire and rescue unit
Authors: Martinovich N V , Mel’nik A A , Kalach A V , Yu Akulov A 
Published: May 2020

Abstract
The article is devoted to the issue of effective management in fire rescue units of the Ministry of Emergency Situations of Russia based on application of functional modeling. Data on functional model of activity of standard fire rescue unit are given. The example of application of functional modeling and business process management in day-to-day operations of fire rescue units, which allows increasing efficiency of management, is considered. The method of assessing the day-to-day activities of the fire rescue unit based on functional modeling described. Problems in the increase of enhancement of the efficiency in the activity of the fire and rescue units related to the Ministry of Emergency Situations (MES) of Russia as well as similar units that are not involved in the federal group of forces and assets is an ultimately burning problem.
Methodical approach to reducing the dimensionality of the task of requirements substantiation for protection of information systems against unauthorized access in organizational-technical systems
Authors: Meshcheryakova T V , Gulyaev O A , Abdullin A A , Batskikh A V 
Published: May 2020

Abstract
The article proposes a methodological approach to reducing the dimensionality of the problem of forming the requirements for the security of information processed in organizational-technical systems with complex architecture. The methodological approach is based on the structural analysis of graphs that formalize the structural scheme of organizational-technical systems and on the construction of the adjacency matrix of the graph. Using the selected elements of strong connectiveness, which form the clusters of architecture, allows further to solve the problem of formation of requirements to the information protection system against unauthorized access and to go from the architecture of organizational-technical system as a whole to the consideration of individual clusters. In this case, the task of forming requirements is significantly simplified. With the use of the proposed method of clustering the architecture of organizational-technical systems, the problem of forming the sets of information protection of objects of biological activity during molecular-biological and genetic - engineering studies is solved.
Nonlinear sixth order models with nonsmooth solutions and monoton nonlinearity
Authors: Borodina Elena A , Shabrov Sergey A , Shabrova Marina V 
Published: May 2020

Abstract
The sixth-order nonlinear spectral problem with nonsmooth solutions is studied. It is proved that the set of non-negative values for which the nonlinear spectral problem has at least one non-trivial non-negative solution is nonempty and coincides with a certain interval. We use the pointwise approach proposed by Yu. V. Pokorny analyzing solutions to a boundary value problem. This approach shown to be effective in the study of the second-order problems. Based on the previously obtained estimates of the Green’s function of the boundary-value problem, it was possible to show that the operator inverting the studied nonlinear problem, representable as a superposition of completely continuous and continuous operators, acts from the cone of nonnegative continuous functions to a narrower set. The last fact allows us to prove the uniqueness of a solution of a nonlinear boundary value problem using the theory of spaces with a cone.
Features of the software implementation of the numerical solution of stationary heat equation taking into account the effects of nonlocal finite element method
Authors: Kuvyrkin G N , Yu Savelyeva I , Sokolov A A 
Published: May 2020

Abstract
The features of the numerical solution of the two-dimensional equation of stationary heat conduction are considered taking into account nonlocal effects. The finite element method using isoparametric finite elements was chosen as the numerical solution scheme. A method for approximating the zone of nonlocal influence was proposed, and an estimate of the time for calculating the coefficients of the thermal conductivity matrix was also constructed. The influence of the main parameters of the model on the final results is studied, and a polynomial family of functions of non-local influence is also studied. The results are compared with the results obtained with the classical approach.
Shortest path algorithm for graphs in instances of semantic optimization
Authors: Yu Lavlinskaya O , Kurchenkova T V , Kuripta O V 
Published: May 2020

Abstract
This article discusses an example of using the algorithm for finding the shortest path to determine the strength of the connection between different words and phrases of the subject area in the tasks of Internet marketing, such as website promotion, thematic traffic, contextual advertising. The input data is words and phrases obtained from search queries and the frequency of their use in the network. Based on the initial data, a weighted graph is constructed, a adjacency matrix is drawn up. The shortest path is determined by the algorithm Floyd-Warshall. The algorithm finds links between words and the force of communication. This approach allows you to find unique semantic combinations and make the necessary search queries. Based on the analysis of the adjacency matrix and the definition of the coherence of words, marketers get a unique tool for solving problems in the field of digital marketing.
Fact-checking algorithms for the Internet
Authors: Martynov A S , Voronina I E 
Published: May 2020

Abstract
Verification of facts refers to the task of verifying textual content. Taking into account the growth of false information on the Internet, fact-checking becomes not only the activity of only journalists. The problem in computer-based fact-checking on the Internet is the lack of universal mathematical models for extracting useful textual information. Proposed the algorithms and mathematical models for extracting useful textual information in order to further verify facts. Presented results of experiments with the practical application of the developed mathematical model for extracting useful text from Internet resources.
Robust method for finding the center and the scatter matrix of the cluster
Authors: Shibzukhov Z M 
Published: May 2020

Abstract
The problem of finding the centers and scattering matrices for a finite set of points containing outliers in a multidimensional space is considered. A new approach is considered in which instead of the arithmetic mean, differentiable mean values are used that are insensitive to outliers. An iterative reweighting scheme for searching for centers and corresponding scattering matrices for the Mahalanobis distance is considered. The examples presented in the article show the robustness property of the proposed method and algorithm with respect to a large number of outliers.
Considering information uncertainty when assessing risk in Bayesian Belief Network
Authors: Gagarin Yu E , Nikitenko U V , Stepovich M A 
Published: May 2020

Abstract
The problem of estimating the average risk in Bayesian Belief Networks is considered, taking into account the uncertainty of the initial data. For estimation of parameters of functional dependences taking into account errors in values of functions and arguments it is offered to use methods of the confluent analysis. The necessity of obtaining interval estimates of functional dependencies and average risk to increase the reliability of decision-making is shown. The Bayesian Belief Network is modeled taking into account random errors.
On “simple” undecidable fragments of positive and elementary theories of free semigroups of finite or countable rank
Authors: Durnev V G , Zetkina O V , Zetkina A I 
Published: May 2020

Abstract
We establish algorithmic undecidability of “simple” (with respect to the quantifier-prefix and the quantifier-free part of the formulas) fragments of positive theories of finitely generated semigroups and elementary theory of a free countably generated semigroup.
Modeling boundaries of the occupation layer of an archaeological site on the basis of principal component analysis
Authors: Zlobina A G 
Published: May 2020

Abstract
An approach is proposed for the integrated processing of the data of multispectral aerial photography and a geophysical survey; this approach is based on the consistent application of the principal component analysis and the fuzzy c-means clustering algorithm. Its use provides the identification of thick humus layer areas, clarification of the boundaries of a thick occupation layer, as well as the localization of sites presumably containing buried archaeological objects. This approach was successfully applied in identifying an occupation layer and modeling its boundaries in the test area of the archaeological site – Kushmanskoye fortified settlement Uchkakar (Udmurt Republic, Yarsky district).
The adaptive algorithm of change of structural redundancy network information systems on the basis of the spectral theories of graphs
Authors: Mezhuev A , Pasechnikov I 
Published: May 2020

Abstract
Operation is devoted obtaining, on the basis of the spectral theory of graphs, the adaptive algorithm of conversion of basic structural models of network information systems for synthesis of topology with the minimum redundancy meeting requirements of structural stability by the given criteria. On the basis of switchings of Zajdel the method providing on each step of operation of cycles of algorithm a finding cospectral structures of high stability is developed. During researches concepts cospectral structures in narrow and wide sense are formulated. Modeling of operation of algorithm and an estimation of information efficiency cospectral network information systems on the basis of the generalized index – performance coefficient of information transfer taking into account influence of noises is led. Results of modeling confirmed a realizability and serviceability of the received algorithm, and also allowed to generate practical recommendations about its application in a structural circuit of complex multiple loop adaptation.
Application of computer simulation by the Monte Carlo method to the study of compositional heterogeneity of the product of copolymerization
Authors: Mikhailova T , Mustafina S , Mikhailov V , Podvalnyi S 
Published: May 2020

Abstract
The article presents the results of a study of the process of copolymerization in an industrial environment gathered by the software developed by the authors. The software is based on the modeling of the copolymerization process by the Monte Carlo method. The core algorithm is the simulation of the growth of each macromolecule of the resulting copolymer and tracking processes occurring with it. At the same time, we took into account that the industrial copolymerization process is carried out continuously in a cascade of reactors, which is reflected in the use of the residence time distribution of particles in the algorithm. The developed model makes it possible to calculate the molecular weight distribution, to construct the compositional distribution of macromolecules depending on the proportion of monomers, the distribution of macromolecules in size and composition for various variants of the ratio of monomers, as demonstrated by the results of computational experiments on modeling the process of copolymerization of butadiene with styrene in a cascade of reactors.
The automatic text analysis toolset for solving practical and research tasks
Authors: Politsyna Ekaterina , Politsyn Sergey 
Published: May 2020

Abstract
Tasks of automated text analysis are increasingly moving from theoretical research and experimental systems into practice. Increased volumes of text information for manual processing caused the need to use automated tools to solve a variety of tasks for a wide range of users operating not only desktop computers but more and more often mobile devices. There is the need of creating new automated systems and services for a wide variety of applications and the lack of universal algorithms for text analysis. In addition, in connection with different performance requirements of the large data volumes processing, it is urgent to develop integrated tools of automated text analysis, quickly solve user problems on any device, tools for deeper text study and create a basis for further research in the field of computational linguistics and testing of new algorithms of analysis. The proposed toolset includes an open system of automated text analysis, web-portal ”Automated text analysis,” a set of services and mobile applications. Its use will provide an ability to create and use software tools to solve practical problems, taking into account the interests of a wide range of users, and promotes research in the field of computer linguistics and deploying their results into various applications.
Hybrid computer modeling system of extrusion processes for quality control of multi-assortment polymeric films
Authors: Polosin A N , Chistyakova T B 
Published: May 2020

Abstract
A hybrid computer modeling system of extrusion processes has been developed, which includes mathematical models of various types. The system helps operators to solve the problems of quality control of multi-assortment polymeric films during change-over of production lines and in the mode of film production. The system includes a module for choice of extruder brands, a designer of virtual 3D extruder screw models, and modules for structural and parametric synthesis of mathematical models of extrusion processes and calculation of throughput, energy consumption of extruders, extrudate quality indices determining consumer characteristics of the film. The model library contains geometric models of screw elements of various types, static functional models of physical processes in channels of screw elements, empirical models of rheological properties of polymers, dynamic models for estimation of residence time, models for calculation of mixing degree, index of thermal destruction and color characteristics of extrudate. Static models have been developed on the basis of conservation and rheology laws. The method of synthesis of a cell-type hydrodynamic model with recycles has been developed. The system is adjusted according to the production method, the film type, throughput and energy consumption requirements. Modeling results are presented as tables, 2D and 3D graphs. Testing of the system according to the data of the productions of polyvinyl chloride and polyethylene films at plants in Russia, Germany has confirmed its operability.
Functional model of expert traffic flow control system within high-speed transportation corridors
Authors: Sysoev A S , Khabibullina E L 
Published: May 2020

Abstract
Recently, the number of vehicles on the roads has increased significantly, including within high-speed transportation corridors. Furthermore, the volume of cargo transportation increases annually not only within the country, but also between different countries. Taking into account these factors, as well as the possibility that unmanned vehicles will soon appear within high-speed transportation corridors, it is necessary to develop intelligent transportation systems that will effectively control traffic flows. Traffic flows are controlled by directional changes in its capacity. In order to interact with road users and road infrastructure, it is necessary to develop an expert system that will make recommendations using the predicted capacity value and information about the current value of the parameters describing the high-speed transport corridor. The article presents a neuro-fuzzy model for predicting capacity by known system parameters and conditions of its functioning, built using the concept of mathematical remodeling. There is also given the results of Sensitivity Analysis based on applying Analysis of Finite Fluctuations depending on external factors. In addition the conceptual and functional models of the developed expert system for regional intelligent transportation system module are proposed.
Modelling the interaction of multicomponent plasma with a CubeSat 1U microsatellite by the molecular dynamics method
Authors: Sharamet A , Zinin L , Vasileva A 
Published: May 2020

Abstract
The results of modeling the interaction of a multicomponent thermal cosmic plasma consisting of oxygen ions, hydrogen and electrons with a charged CubeSat 1U microsatellite are considered. For the simulation was used method of molecular dynamics. The characteristic features of the spatial distribution of hydrogen and oxygen ions are considered. Near a positively charged spacecraft, there is a region of negative charge, which eliminate a satellite charge. Behind the satellite is the region of the “ion shadow” in which the concentration of ions is close to zero. The spatial features of the “ion shadow” depend on the type of ion, the temperature of the plasma, the velocity and charge of the satellite relative to the plasma. The process of formation of an “ion shadow” for a number of parameters is considered.
Neural net decoders of nonbinary codes
Authors: Butov V V , Dumachev V N , Fedyaeva S E 
Published: May 2020

Abstract
In paper, neural net decoders of nonbinary error correction codes are considered. Analytic methods for calculating of synapse weight coefficients are proposed. It is shown that for codes (n, k) with a small number of corrected errors (n − k ≪ k), it is advisable to use a 6-layer universal classifier based on the feature space of parity symbols. For codes with k ≪ n − k, it is proposed to use a 3-layer classifier on feature space of information symbols.
Numerical modeling of the stress state of constructions from fibrous composites
Authors: Polatov A M , Ikramov A M , Pulatov S I , Gaynazarov S M 
Published: May 2020

Abstract
The paper is devoted to numerical modeling of the deformed state of physically nonlinear transversely isotropic bodies with an aperture. To solve the problem of the theory of plasticity, a simplified theory of small elastoplastic deformations for a transversely isotropic body is used. In work, to describe the anisotropy of the mechanical properties of transversely isotropic materials, a structural-phenomenological model is used. It allows you to represent the source material in the form of a complex of two jointly working isotropic materials. The main material is considered from the standpoint of continuum mechanics. The fiber material is oriented along the anisotropy direction of the starting material. It is assumed that the fibers perceive only the axial tensile-compression forces and are deformed together with the main material. The presentation of fibrous composites in the form of homogeneous anisotropic materials with effective mechanical parameters allows a fairly accurate calculation of structures with stress concentrators. Based on a simplified theory and finite element method, a computer model of nonlinear deformation of fibrous composites is constructed. The influence of the configuration of holes and a rectangular crack on the distribution of deformation and stress fields in the vicinity of these concentrators is investigated.
Algorithms of signal parameter estimation based on the theory of Compressive Sensing and their computer simulation
Authors: Parfenov V I , Golovanov D Y , Kunaeva N A 
Published: May 2020

Abstract
The problem of estimating unknown signal parameters in the presence of noise is a classical problem in statistical radio engineering. There are many algorithms for solving this problem. Many of these algorithms are based on the use of well-known statistical optimality criteria in order to improve the estimation efficiency. Therefore, they acquire a high computational complexity. In this article, in order to reduce computational complexity, it is proposed to modernize the classical correlation algorithm based on the new Compressive Sensing theory, which has been actively developed in recent decades. The article presents a new simplified algorithm of signal parameters estimation, outlines operational speed benefits, and compares the efficiency of the proposed algorithm to the efficiency of the classical algorithm as well as some other algorithms. The proposed algorithm has also been compared to the classical one according to computational complexity. Practical implementation of the proposed algorithm requires much smaller number of arithmetical operations with some deterioration in unknown parameter estimation accuracy.
Piecewise interpolation solution of the Cauchy problem for the transport equation with iterative refinement
Authors: Romm Ya E , Dzhanunts G A 
Published: May 2020

Abstract
This article deals with the method of approximate solution of the Cauchy problem for the transport equation based on the Newton interpolation polynomial of two variables with iterative refinement. In each element of the division of a rectangular domain into subdomains, a polynomial approximation of the partial time derivative is constructed. The interpolation polynomial is transformed into the form of an algebraic polynomial with numerical coefficients. In the integrated form, the polynomial is substituted for the dependent variable in the right side of the expression of the partial time derivative. Iterative renewal of the process at a fixed polynomial degree leads to the analogue of Picard’s method of successive approximations.
About torsion of inhomogeneous rods made of ideal rigid plastic material under linearized condition of plasticity
Authors: Mironov B G , Mironov Yu B 
Published: May 2020

Abstract
The torsion of inhomogeneous rods made of ideal rigid plastic material is investigated in this work. The integrals determining the stress and strain states of a rod under linearized plasticity condition are obtained. The field of characteristics of the basic relations is constructed, the rupture lines of stresses are found.