bluuebunny/crossref_metadata_2025_split huggingface dataset:
Making decisions on issuing sub-federal bonds in Russia: key factors modeling
Authors: Yakunina A , Mitrofanov A , Ermakova E , Yakunin S , Korobov E , Semernina Y 
Published: February 2021

Abstract
Recently, Russian regions have been more active in using sub-federal bonds to finance regional debt. However, the Russian sub-federal bonds market’s liquidity is still low while regional authorities often use commercial bank loans to finance the regional budget deficits. The purpose of this study is to identify the key factors influencing the regional authorities’ decisions to issue sub-federal bonds. The impacts of the following factors were assessed: the regional budget deficit volume, the Central Bank key rate, the budget loan proportion of the regional debt, the regional debt burden, average per capita cash income in the region, the employed in the region. We used monthly data for 85 regions (constituent entities of the Russian Federation) for the period 2015–2019.
Various regression models for panel data have been developed: those predicting probabilities of a non-zero value of regional bond volume, the volume itself, and combined generalized linear mixed hurdle model with a negative binomial distribution (estimated with glmmTMB contributed package of R). The latter showed non-significant dependence of regional bond volume on region budget surplus, prioritizing unobserved region-specific random factors.
Mathematical modeling of circular sandwich plate interaction with viscous liquid layer for predicting its hydroelastic response
Authors: Kondratov D V , Mogilevich L I , Popov V S , Popova E V , Chernenko A V 
Published: February 2021

Abstract
The paper proposes a mathematical model for predicting the hydroelastic response of a mechanical system consisting of a circular sandwich plate forming the bottom wall of a narrow channel filled with a pulsating viscous liquid. The pressure pulsation in the liquid layer is caused by upper vibrating channel wall represented by a rigid disk. We needed to formulate and solve the hydroelasticity problem for developing the mathematical model. The hydroelasticity problem consisted of the Navier-Stokes equations, the continuity equation, the circular sandwich plate dynamic equations, and the corresponding boundary conditions. The viscous liquid layer movement was assumed as a creeping one. We studied the stationary axisymmetric hydroelastic oscillations problem under harmonic pulsation of liquid pressure, i.e. harmonic vibrations of the upper channel wall. Using the perturbation method, we obtained the system of two integro-differential equations for studying the radial and flexural vibrations of the sandwich plate. Hydroelastic oscillations of the main mode were considered as a special case. The program for calculating the hydroelastic response of circular sandwich plate in various frequency ranges was developed. As an example, we made calculations of the circular sandwich plate amplitude-frequency response. The developed model can be applied in monitoring and decision-making systems for complex mechanical objects.
Mathematical models of the development of industrial enterprises, with the effect of lagging internal and external investments
Authors: Saraev A L , Saraev L A 
Published: February 2021

Abstract
The article proposes new models of the dynamic development of enterprises that restore their production through internal and external delayed investments. Differential balance equations for such enterprises are established, which describe changes in factors of production and output. Proportional, progressive and digressive depreciation deductions are considered and their interaction with internal and external investments is investigated. The conditions of the limiting state of work of enterprises are formulated and the corresponding values of the factors of production are calculated. Various options for the development of enterprises, including their stable operation, temporary suspension of their activities for the period of technical re-equipment, and temporary partial curtailment of their production, have been investigated. The regularities of the influence of the volumes of depreciation deductions, internal and external investments on the dynamics of enterprise development are revealed. Numerical analysis of the developed models showed good agreement with the known statistical data on the work of industrial enterprises.
Assessment of structural changes in the spatial innovative development of Russian regions
Authors: Firsova A A , Tsypin A P 
Published: February 2021

Abstract
The study of the effectiveness of spatial innovation development is a highly topical issue today due to the increased impact of innovation on economic growth. In order to assess the structural dynamics of regional innovative development, an analysis of the innovation indicators for Russian regions in 2010–2018 was carried out. Cluster analysis and the correlation-regression method were used to assess the structural changes in the innovative development of Russian regions. The analysis demonstrates an increased number of entities in the innovative leading region cluster by 2018, which can be considered as a positive result of innovation policy and the growth in indicators of regional innovative development. The research results can be used to develop regional innovative strategies and decision making for the further development of innovative activities.
Thermal deformation and polymorphic transitions of 1,1-diamino-2,2-dinitroethylene in the temperature range from 145 to 475 K
Authors: Stankevich A V , Taibinov N P , Kostitsyn O V , Garmashev A Yu 
Published: February 2021

Abstract
Under atmospheric pressure conditions, direct polymorphic transitions α to β, β to γ and reverse γ to α were studied, as well as certain phase equilibrium points for 1,1-diamino-2,2-dinitroethylene (DADNE) were determined in the temperature range from 145 to 475 K. The anisotropic characteristics of the thermal deformation of DADNE crystals are determined by powder thermal x-ray diffraction of an internal standard. The points of structural changes were recorded in increments of 20, 10, and 2 K. The calculations of x-ray powder diffraction data were carried out using full-profile analysis methods with the integrated cycle of molecular modeling of the structure of molecules integrated into the algorithm.
Molecular dynamics simulation of ion binding in aqueous solution of 18-crown-6 ether
Authors: Bakulin I K , Kondratyuk N D , Lankin A V , Norman G E 
Published: February 2021

Abstract
Crown ethers are unique compounds with exceptional ion binding properties. We investigate the 18-crown-6 ether molecule binding selectivity for a set of alkali ions (K+, Rb+, Cs+). We employ combination of umbrella sampling technique with the weighted histogram analysis method to derive free energies of ion–ether association. The obtained results are in a good agreement with experimental values available and represent the ion selectivity feature of the 18-crown-6 ether.
Detonation properties of explosive proppants based on slurry nitromethane plus ammonium perchlorate mixtures
Authors: Komissarov P V , Basakina S S , Lavrov V V , Sokolov G N 
Published: February 2021

Abstract
In this paper, the results of investigation on detonation properties of heterogeneous mixtures of ceramic proppants with slurry liquid explosives (LE) such as nitromethane (NM) plus ammonium perchlorate compositions are presented. The mixtures discussed are promised to be used for far field fracture stimulation of oil bearing formation subjected to hydraulic fracturing. Experimental results on detonation velocities of LE-proppant mixtures in long tubes up to 25 diameters versus internal diameters are presented. Results of experimental comparison of detonability of LE studied with pure NM in proppant matrix are also represented. The objective of the study was to assess detonability and detonation parameters of these mixtures at various initial conditions.
Investigation of plasma states formed under the interaction of high-power laser pulses with wire-shape Al–Cu target
Authors: Golovin D O , Alkhimova M A , Pikuz T A , Abe Y , Honoki Y , Lee S , Matsuo K , Koga K , Okamoto K , Shokita S , Arikawa Y , Faenov A Ya , Fujioka S , Pikuz S A , Skobelev I Yu , Nishimura H , Yogo A 
Published: February 2021

AbstractStudy of warm dense matter remains a very important task for understanding of many unique phenomena observing as in astrophysical research as in inertial fusion and fast ignition. In this work, we studied the parameters of plasma created by 1.7 ps laser pulses of relativistic intensity of 7 × 1018W/cm2in a specially designed Al–Cu wire-shape target, in comparison with a flat Cu and Al foil targets. We observed the strong emission of neutral or virtually neutral CuKαline from both Cu foil and Cu wire part of targets, which indicates the creation of a dense state exposed to the intense flow of hot electrons. Parameters of the plasma were evaluated by comparison of experimental spectra with the results of modeling by collisional-radiative kinetic code PrismSpec under the plasma zone approach. The using of Al foil in front of Cu wire part of target allowed avoiding the direct heating of Cu-wire and acquiring spectra of Cu K-shell emission evidently belonging to emission of warm dense matter (WDM) state. The upper estimate for the electron temperature in WDM region was found to be below 80 eV.
Intensification of heat transfer during spinodal decomposition of a superheated aqueous oligomer solution
Authors: Volosnikov D V , Povolotskiy I I , Igolnikov A A , Vasin M G , Son L D , Skripov P V 
Published: February 2021

Abstract
The heat conduction of an aqueous solution of polypropylene glycol in the region of stable and unstable states was studied by the method of pulse isothermal impact on a substance with a characteristic time of 100 ms. It has been shown that the short-term superheating of a homogeneous solution not only above the liquid-liquid equilibrium temperature (low critical solution temperature), but also above the diffusion spinodal is fundamentally possible. The negative character of the deviation of the heat conduction of a solution from the additive law calculated from the heat conduction of the pure components at a given temperature was revealed. The signs of manifestation of spinodal decomposition accompanied by a significant intensification of heat transfer were found.
Search for muon neutrinos from the gravitational wave event GW170817 at the Baksan Underground Scintillation Telescope
Authors: Boliev M M , Butkevich A V , Dzaparova I M , Kochkarov M M , Kurenya A N , Lidvansky A S , Novoseltsev Yu F , Novoseltseva R V , Petkov V B , Striganov P S , Yanin A F 
Published: February 2021

Abstract
Using data of the Baksan Underground Scintillation Telescope we have searched for muon neutrinos and antineutrinos with energies above 1 GeV coinciding with the gravitational wave (GW) event GW170817 that was recorded on August 17, 2017, by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Advanced Virgo observatories. This is the first detection of the new type of events occurring as a result of a merger of two neutron stars in a binary system. A short gamma-ray burst (GRB) GRB170817A accompanying this event is evidence of particle acceleration in the source whose precise position was determined by detection of the subsequent optical signal. No neutrino signals were found with the Baksan Underground Scintillation Telescope in the interval ±500 s around the moment of the gravitational wave event GW170817, as well as during the next 14 days. The upper limits on integral fluxes of muon neutrino and antineutrino from the source are derived.
Impact of nuclear gluon distributions on leptoquark production by neutrinos
Authors: Alikhanov I 
Published: February 2021

Abstract
We investigate non-standard interactions of neutrinos with atomic nuclei through excitations of leptoquarks. A leptoquark term in the Lagrangian admits the possibility that neutrinos interact with gluons. The current lower limits on the leptoquark masses are of the order of 1 TeV depending on the leptoquark quantum numbers and couplings. Such heavy states can be produced in ultra-high energy cosmic neutrino scattering processes. The four-momentum transfer squared and the Bjorken variable simultaneously probed in these processes may reach values kinematically inaccessible at present collider experiments. We study the impact of the gluon density in a nucleus on the cross section for the neutrino-induced leptoquark production. We show that taking into account the nuclear parton distributions shifts the production threshold to significantly lower neutrino energies. As a particular case we consider the interaction with oxygen, which is abundant in water targets used in neutrino detection experiments.
Simulation of shock-body interactions using the Runge–Kutta discontinuous Galerkin method with adaptive mesh refinement implemented on graphic accelerators
Authors: Korneev B A , Zakirov A V , Levchenko V D 
Published: February 2021

Abstract
In this paper, a numerical scheme for solving the equations of the dynamics of a compressible fluid, based on the Runge–Kutta discontinuous Galerkin (RKDG) method and an adaptively refined cubic mesh (AMR), is applied to the problems of shock interaction with solid and liquid obstacles. Features of effective implementation algorithm for the graphic processors (GPU) are described. Several well-known validation test problems are considered. Results of full detailed three-dimensional simulations of the shock with the gas or fluid bubble using the developed GPU–RKDG–AMR solver are presented.
Molecular dynamics analysis of incipient soot morphology
Authors: Goldshtein K D , Potapov D O , Shadymov V A , Orekhov N D 
Published: February 2021

Abstract
Understanding mechanism of the soot formation process is important for reduction of harmful emissions from combustion and also for synthesis of carbon nanostructures. However, at the moment, both the mechanisms of carbon cluster formation and its morphology are poorly understood. In this paper, we present the results of molecular dynamics simulation of the formation and growth of carbon clusters formed at high temperatures from polyaromatic hydrocarbons.
Increasing the trapping lifetime of lithium-7 atoms in optical dipole trap
Authors: Saakyan S A , Sautenkov V A , Morozov N V , Bobrov A A , Zelener B B 
Published: February 2021

Abstract
We have developed far-off resonance single beam dipole trap for optically cooled lithium-7 atoms. In the present paper we discuss some preliminary results. In order to improve performance of the trap we optimized the trapping time and increased the atoms number. The lifetime was increased by improving the vacuum from ≈ 3 × 10−10 Torr to ≈ 10−11 Torr and preparing all the atoms in the selected atomic state (the lower ground state level). After vacuum improvement the single particle losses in the magneto-optical trap was reduced by 100 times and as the result the lifetime in the dipole trap reached 25 s.
Reasons for rotating of dust structure in a highly non-uniform magnetic field
Authors: Dzlieva E S , Pavlov S I , Novikov L A , Tarasov S A , Polischuk V A , Karasev V Yu 
Published: February 2021

Abstract
A study of a dust trap in a glow discharge in highly non-uniform magnetic field is carried out. The trap is near the end of the solenoid on the side of the anode part of the discharge; it exists only in the magnetic field and it is resistant to its change. In the trap a volume dust structure is formed and comes into rotation with angular velocity of about 10 rad/s depending on the conditions. The interpretation of the reasons of rotation of the dust structure in the detected dust trap is given. Four physical processes known from literature are considered; numerical estimates are made. A feature of the dust trap being studied is a highly non-uniform magnetic field in which the discharge current channel expands and its radial component appears. Ampere force action due to radial component of current and longitudinal component of magnetic field is taken as the reason of dust structure rotation. The numerical estimate for the average section gives the value from 2.5 to 10 rad/s depending on the assumption of the radial component of the current.
Differential equations of the rigid vibratory drum interaction with compacted soil
Authors: Tarasov V N , Boyarkina I V , Serebrennikov V S 
Published: February 2021

Abstract
Differential equations of the rigid vibratory drum dynamic interaction with compacted construction soil are obtained, and relationships of the vibratory drum geometric parameters with soil characteristics and technological parameters of the soil compaction process are determined. The vibration exciter driving radial force has been replaced by the vertical driving medium operating constant force. The vibratory drum interaction with the soil is considered during a vibration exciter eccentric weight half-turn during which the vibratory drum singe influence occurs on the compacted soil. The reaction force of the vibratory drum with the soil is written using the linear Hooke’s law, that has allowed to obtain an analytical solution adequate to the real process of the soil compaction by the vibratory drum.
Sensor of the electric field strength vector components in the form of three mutually perpendicular square
Authors: Biryukov S V , Kolmogorova S S , Kolmogorov A S 
Published: February 2021

Abstract
The development of instruments for measuring the electric field strength is not a simple scientific and practical task. First of all, this is due to the high metrological requirements that are imposed on sensors of electric field strength. There is a wide variety of electric field sensors of various shapes (cubic, cylindrical, spherical), the principle of action (directional and non-directional reception) and design features (housing, uncased) do not provide the desired metrological characteristics. Therefore, scientific work related to the development of sensors of electric field strength is developing and relevant. The aim of the scientific research is to create a frameless three-axis electric field strength sensor, which would be easy to calculate both for housing sensors, as well as simplicity of design and small mass as for frameless sensors. The constructive sensor created as a result of scientific research represents three mutually perpendicular square dielectric plates. The sensing element bases are square conductive sensing elements. The sensor has a different spatial measurement range and depends on the desired error. A large error correlates with a wider range. For a measurement error of no more than 10%, the maximum possible spatial measurement range will be a = 0.33. Consequently, the minimum possible distance to the field source, at which the sensor error is no more than 10%, will be d = 3L, where L is half the side of the square sensitive element.
Methods and Means of Ensuring Information Security in Fiber-Optic Communication Lines
Authors: Bogachkov I V , Gorlov N I 
Published: February 2021

Abstract
This paper considers the problem of protection against an unauthorized access and presents the results of comparing different methods for extracting data from optical fiber. This paper provides classification of methods of information receiving, physical principles of leakage channels formation, as well as methodology as to how to send a share of the optical radiation outside the propagation medium. The simplest of the analyzed methods is the bending of the optical fiber when the conditions of full internal reflection are broken. In this case, the monitoring system controls the introduced losses to detect fiber bends. This work outlines the structure, principles of operation, as well as the trends in the development of monitoring systems.
Geometric models of multi-parametric technological processes for estimation some inverse control problems
Authors: Chijik M A , Yurkov V Yu , Dolgova E Yu 
Published: February 2021

Abstract
This paper is devoted to the geometric and computer simulation of multi-parameter systems. We adduce description of original method and algorithm which may be used for inverse control problem solution. We describe the multidimensional geometric model based on experimental data. We base our method on the set of one-dimensional spline approximations which form a non-linear frame of hyper-surface. The method, algorithm and software of visualization have been used in researching heat-insulating packets of clothing industry. Control of technological processes connected with the manufacturing of the packets is considered as an inverse problem. As the result we received new scientific-based parameters of the heat-insulated packets and these parameters may be used in clothes design and for the control of manufacturing technology.
Development of the analyzing system for user’s actions in the informational environment
Authors: Karpova N E , Baranov A S , Emelina A A , Konovalov A E 
Published: February 2021

Abstract
The main topic of the article is the analysis of user actions in a computer system and the development of a monitoring system for anomalous user actions in the information environment. To develop the system, the mathematical apparatus of fuzzy logic was used. The main advantage of information environment monitoring systems based on the theory of fuzzy sets is the ability to take into account most of the development scenarios while describing schemes for analysing flows of the information environment, as well as to track a large number of computer parameters. In the course of the study, it was revealed that the actions of intruders differ from the behaviour of ordinary users. As a result, the authors propose a developed system for monitoring anomalous user actions in the information environment, which is based on the analysis of event logs. A system operation requires an accumulation of information (audit files, data on login time and session duration, data on file deletion, etc.), on the basis of which a standard (template) of normal user behaviour is created. Then, the user’s behaviour is compared with the standard, and when anomalies are detected, the system signals deviations. This algorithm makes it possible to track a large number of user parameters to determine unauthorised access.
Evaluation of the effective dielectric capacitivity in the near-surface soil
Authors: Yashchenko A S , Krivaltsevich S V , Bobrov P P 
Published: February 2021

Abstract
The results of estimate of the effective dielectric permittivity a presented. We measured the soil moisture data in a toplayer 2 meters thick. This data used to calculate the view of depth’s dependence of real part of the soil’s complex dielectric permittivity and conductivity. We calculated of soil surface reflectivity at a frequency of 3 and 30 MHz. This data were used to estimate of the soil’s effective dielectric permittivity and conductivity.
Development of a Branch and Bound Algorithm for One Competitive Facility Location Problem with Elastic Demand
Authors: Levanova T , Gnusarev A 
Published: February 2021

Abstract
We consider a variant of the Competitive Location Problem, in which it is necessary to choose not only location, but also the design of facilities in order to maximize the share of customer demand served. It is described as an integer programming model with a nonlinear objective function. Commercial software is not suitable for finding the optimal solution to this problem in a reasonable time. Previously, Aboolian R. et al. proposed an adapted weighted greedy heuristic for this problem. In our earlier study, we developed several variants of local search algorithm. This article is devoted to development of the branch-and-bound algorithm. The scheme of branching is described, the results of a computational experiment are presented, future development possibility is discussed.