bluuebunny/crossref_metadata_2025_split huggingface dataset:
Prospects of test systems use for assessing the water quality of small rivers and reservoirs in the Samara region
Authors: Shabanova A V , Zakirova M N , Chuprina E V 
Published: May 2021

Abstract
Protection against pollution of surface and ground waters is implemented at different levels of state environmental protection management, including the regional one. There are a number of programs in Samara region aimed at providing residents of the region with high-quality drinking water and environmental rehabilitation of water bodies, including small rivers. Information support for making management decisions in this area is the data of environmental monitoring. On the example of the data on dissolved oxygen content in the water of rivers and reservoirs of Samara region, the shortcomings of the existing system of environmental monitoring were identified, which covers only a small part of water bodies of economic importance. At the model object, which was chosen as one of the ponds of Samara, the capabilities of the test systems for measuring the content of dissolved oxygen were shown. It was also shown the desirability of using the test systems for water bodies in remote areas of the region as part of the expansion and improvement of the existing environmental monitoring system.
Relativistic magnetic flux quantum - a unique radiation carrier
Authors: Jumaev Mustakim , Sharipov Mirzo , Rizoqulov Mirzokhid 
Published: May 2021

Abstract
The work found the shape of spectral lines of electromagnetic radiation produced by a relativistic quantum of magnetic flux moving in a Josephson transmission line under the action of a purely fluctuating external current and dissipation. It is shown that even in the case of a Gaussian noise current, the shape of the spectral lines of electromagnetic radiation has an essentially non-Gaussian form. The limited dispersion of the frequency of electromagnetic radiation (which is determined by the pinching of the spectral lines of radiation) is proved, due to the relativistic properties of the quantum magnetic flux. This is another unique aspect of the relativistic quantum magnetic flux - as a carrier of electromagnetic radiation in the Josephson transmission line.
Modelling and optimizing sensor wireless network systems
Authors: Ya Lvovich I , Lvovich Ya E , Preobrazhenskiy A P , Preobrazhenskiy Yu P , Choporov O N 
Published: May 2021

Abstract
This paper is connected with the necessity of problem modelling and optimizing sensor wireless network systems. The general scheme of a multi-step process of making the optimal decision in sensor wireless network systems is given. The main steps of the computational scheme of the dynamic programming method are given. It is shown how to increase the efficiency of the wireless sensor network. All possible variants of optimal strategies are demonstrated that ensure obtaining the maximum value of a generalized performance indicator. The results of the paper can be useful in the development of wireless sensor networks with high performance indicators.
The Surface polaritons with negative group velocity at the vacuum-resonant dielectric interface
Authors: Yatsyshen V V 
Published: May 2021

Abstract
Surface polaritons most clearly manifest their properties when the processes of energy dissipation are neglected. In this case, they are collective excitations that propagate exclusively along the interface, and the energy flux of surface polaritons deep into the medium becomes zero. A more realistic model of a surface polariton assumes that dissipation processes are always present. In this case, the surface polariton partially penetrates deep into the medium due to the appearance of the real part of the propagation constant in this direction. It should be emphasized that in the region of existence of a surface polariton, the dielectric constant of the medium has strong frequency dependence; therefore, by virtue of the Kramers-Kronig relations, the dielectric constant must have an imaginary part, which is precisely responsible for the dissipation processes. In this paper we show that when surface polaritons are considered at the vacuum-resonance insulator boundary and strict allowance for dissipation, frequency regions arise in which surface polaritons have a negative group velocity and the dielectric acquires the properties of a metamaterial.
Improvement of aerodynamic characteristics of air propellers of wind power plants using jet mechanization of blades
Authors: Osovskii D I , Sharatov A S 
Published: May 2021

Abstract
The paper considers the possibility of increasing the efficiency of wind power plants through the use of jet mechanization of propeller blades. The study of jet mechanization of the blade was carried out for the aerodynamic profile of NACA 0012 by numerical simulation in the Flow Vision software. The calculations were carried out by solving the plane problem of a completely compressible fluid or gas flow around the blade profile. The results of numerical simulation confirmed the change in the profile characteristics when additional air is supplied to the profile suction surface. The results obtained have been verified with the results of other authors. The data obtained as a result of modeling can be used both in the creation of new wind stations and in the capital improvement of the existing ones.
Innovative approaches in the training of engineering personnel
Authors: Kameneva G A , Bondarenko T A , Sedov A I 
Published: May 2021

Abstract
The article is devoted to the problems of using innovative technologies in the process of training future specialists in the field of applied physics and engineering. The necessity of development and implementation of innovative technologies in higher education is substantiated. The effectiveness of the proposed technologies is evaluated in terms of the formation of professional competencies of bachelors. The article considers innovative approaches and the corresponding educational technologies. The experience of the development and integration of innovative technologies in the educational process of a technical university is described on the example of teaching mathematical subjects for students. The article describes the experience of the effective use of electronic educational environment of the university to create original elements of electronic educational resources, considers the possibility of introducing students to VR \ AR technologies in the framework of project activities. The article discusses the results of a training experiment in which students of technical training areas participated.
Mathematical modelling of risk and safe regions of technical systems and surviving trajectories
Authors: Rogalev A N , Rogalev A A , Feodorova N A 
Published: May 2021

Abstract
The reliability of a technical system is the ability to perform the required functions, being within the specified boundaries of all parameters and conditions of application of the technical system.The concept of safety of a technical system is based on damage. Damage is the amount of deterioration in the quality of the system.The amount of damage determines two properties: the hazard of the system is a characteristic of the ability to suffer or cause damage;safety of system is a characteristic that prevents damage from occurring or reducing its magnitude to an acceptable value.The article deals with the analysis of safe and dangerous states of a technical system based on the study of the properties of their mathematical models, especially the survival of their trajectories.The relationship between the security areas and the practical stability of the technical system as the limitation of all its trajectories is determined.
Boundary revision of a beam model for a thin-walled waveguide at bending vibration
Authors: Kudryavtsev I V , Brungardt M V , Kudryavtseva Yu M , Kolotov A V , Rabetskaya O I 
Published: May 2021

Abstract
The paper discusses the problem of choosing a model type for a straight thin-walled waveguide with a rectangular cross-section during its vibrations. To do this, calculations were made of the first natural frequency of vibration for waveguides of different geometric sizes. The restraints of the waveguide were accepted by a cantilever, hinged, and fixed supports. The difference between the values of the first natural frequency of vibration for the beam and shell waveguide models was estimated. Calculations were carried out analytically on the theory of beam vibration and by the numerical method of finite elements. The results show that the boundary known in static calculations of the applicability of the beam model Rmax/L = 0.1 requires clarification at bending vibrations for the small thickness of the section wall. With small wall thicknesses, the error of calculating the first natural frequency of vibrations will increase sharply due to the effect of a beam section warping.
Approximation of a supports stiffness influence on support coefficient values for a spring-hinged beam by quadratic functions
Authors: Mityaev A E , Kudryavtsev I V , AIvanov V , Khomutov M P , Kolotov A V 
Published: May 2021

Abstract
The paper proposes the approximation for the dependence of the beam first frequency on the torsional stiffness of its supports using quadratic analytical functions. For this purpose, a numerical solution of a beam’s free vibration equation for a large range of torsional stiffness of supports is made and support coefficients are calculated. The obtained values are divided into three subbands, each of which is approximated by a quadratic function. This approach reduced the approximation error and allowed to use a quadratic polynomial. This allows solving the direct problem of analytical approximation, as well as solving the inverse problem of finding the required stiffness of the supports to achieve the required coefficient of supports and, accordingly, the frequency of vibration of the beam. Normalizing the obtained support coefficients is proposed for a more convenient estimation of the effect of their values on the first frequency of beam vibration.
Wave dynamics in a bubbly liquid during the synthesis of gas hydrate
Authors: Chiglintseva A S , Nasyrov A A , Chiglintsev I A 
Published: May 2021

Abstract
In this work, on the basis of the equations of a bubbly liquid, a numerical simulation of the process of propagation of pressure waves of moderate amplitude, accompanied by the synthesis of gas hydrate in water with gas bubbles Freon-12, was carried out. The dynamics of plane-one-dimensional shock waves with a stepped profile, the volumetric gas content of the gas in the gas-liquid medium, and the average density of the gas hydrate are shown. The situation is considered when in the initial state of the bubble mixture hydrate formation does not occur, but when exposed to a shock wave, due to an increase in pressure in the bubbles and their fragmentation, favorable conditions for hydrate formation are created at the interface. Also, the use of gas hydrate synthesis technologies creates prerequisites for solving the problem of the greenhouse effect on the planet, and hence the climate. One of the solutions may be an increase in the interphase surface upon contact between water and hydrate-forming gas. Some theoretical calculations based on the model of gas hydration behind the pressure wave are presented.
A generalized solution of a modified Cauchy problem of class R
2 for a hyperbolic equation of the second kind
Authors: Abdullayev A , Zhuvanov K , Ruzmetov K 
Published: May 2021

Abstract
One of the main problems in the theory of partial differential equations is the study of equations of mixed type. the modified Cauchy problem for some values of α is stated and investigated. The equations of the mixed type began to be studied systematically, after FI Frankl indicated their applications to the problems of transonic and supersonic gas dynamics. In this regard, the purpose of this work was to find out whether it is possible to find a more convenient form of representation of the solution of the Cauchy problem for a differential equation, with the help of which it would be possible to solve boundary value problems for a mixed type equation of both parabolic-hyperbolic and elliptic-hyperbolic types. The modified Cauchy problem for some values of α is stated and investigated. A convenient representation of the generalized solution of the modified Cauchy problem is obtained.
Phenomenological modeling of systems with continuous liquid phase for optimal control of ultrasonic cavitation influence
Authors: Golykh R N 
Published: May 2021

Abstract
The paper presents approach to optimal control of intensity of ulrasonic oscillations. The goal of control is providing maximum of energy efficiency of changing of structure and characteristic of mediums. The goal is achieved by developing complex phenomenological model of process under ultrasonic oscillations. The phenomenological model takes into account kinetics of processes and allows to determine real energy consuming. The model was tested on processes mechanical destruction of macromolecules and dispersing. The results of calculations by the model are dependencies of fractional composition liquid macromolecules and solid particles on time and viscosity of liquid, structure component of attenuation coefficient on intensity and viscosity of liquid. The model allows to evaluate multipliers for intensity providing maximum efficiency of cavitation. The multipliers allow to optimizing ultrasonic influence (increasing energy efficiency) and constant for specific process. Using of the multipliers increases the energy efficiency of process up to 1.8 times. Obtained results confirmed by experiments and can be used for ultrasonic equipment development.
Development of comprehensive program for the implementation of strategy to increase competitiveness in the global satellite communications market for Russian company
Authors: Komarova N V , Slav S I 
Published: May 2021

Abstract
The study is devoted to the development and control of a plan for the implementation of strategic measures to increase competitiveness in the global satellite communications market for a Russian company owning an orbital constellation in geosynchronous orbit. Previous work of the authors was devoted to the development of this strategy. The methodological basis of the study was formed by the concepts and views of Russian and foreign experts in the field of communications and scientific workers. Improving the quality of strategic management was ensured using the Industry 4.0 tools, network project management and experiment. In the course of the study, the stages of strategy implementation were worked out. The system of strategic changes related to the implementation of the strategy is presented. The forecast values of the allocation of financial resources for the development of the enterprise positioning strategy in the global satellite communications market are given and data on the need for additional staff to implement the positioning strategy in the directions are given, the strategic control technology is developed. The practical significance of the study is determined and confirmed by the fact that the findings of this study can serve as a guide for all enterprises in the satellite communications market facing the problem of competitiveness in the telecommunications market.
Theoretical aspects of the theory of decision-making in terms of contracting in the field of metrological support
Authors: Malikov V N , Munister V D , Zolkin A L , Kalyakina I M , Bobkov V V 
Published: May 2021

Abstract
The article is dedicated to consideration of the role and significance of applied applications of the theory of finite automata and the theory of relational contracting in economics and metrology. The applied use of the theory of automated control in the general theory of decision making is substantiated in the form of formalizing the rules of rigid logic in the analysis of decisions. The optimization importance of discrete finite automata in the monitoring of economic objects is concretized, a diagram of the relationship between the measuring tasks of metrology and the parameters of the elements of a typical production process is indicated.
Atmospheric precipitation as a source for the formation of surface water resources of the desert zone
Authors: Kh Saidova M , Kh Shafkarov B , Tolipova D N , Akramova N A 
Published: May 2021

Abstract
The purpose of this article is to scientifically substantiate the metrological aspects of the possible volumes of surface runoff throughout its entire territory, which could be used in the interests of agricultural production. The article discusses the monthly norms of atmospheric precipitation at the meteorological stations of the Kyzyl Kum desert. It has been determined that in the Kyzyl Kum desert up to 75% of atmospheric precipitation falls in liquid form. Accordingly, the share of solid and mixed precipitation accounts for about 25%, and this ratio regularly changes with the movement from north to south. At present, the conditions for the formation and regularities of the spatial distribution of surface water resources of the Kyzyl Kum desert are unknown and, in the author’s opinion, it is economically inexpedient to neglect them, especially in dry years. The study used the most developed method of correlation functions to estimate the possible error in extrapolating the sum of atmospheric precipitation to a given area, but with respect to the entire set of meteorological stations available in the Kyzyl Kum desert. The results of the study showed a high stability of the ratios of monthly and maximum daily amounts of atmospheric precipitation. This stability takes place both in relation to the entire spring time and throughout the entire area of the Kyzyl Kum desert. Such stability and calculated ratios make it possible to roughly determine the daily precipitation amount, having only data on their monthly amount.
Determination of toxicity of soil contaminated with by of petrochemical hidrocarbons
Authors: Ovsyannikova I V , Shulaev N S , Pryanichnikova V V , Kadyrov R R 
Published: May 2021

Abstract
This work presents the results of experimental studies of the effect of the distillation residue of petrochemical industry containing heavy hydrocarbons on soil toxicity using phytotesting methods. Spring wheat «Omskaya-36» seeds were used as a test object. The experiments were conducted according to the certified method for determining soil toxicity by seed germination and measuring the average length of watercress seedlings (Lepidiumsativum) FR.1.39.2016.24117. The studies were conducted in laboratory conditions for three types of soil: gray forest, sod-podzolic, leached chernozem. The assessment was determined by such parameters as seed germination, underground, aboveground and the total seedling length. The studies revealed a negative effect of the petrochemical distillation residue on the studied soil types. The results showed the effectiveness of using Lepidiumsativum to determine the toxicity of the analyzed soils containing toxic hydrocarbons. The developed method can be used for the analysis of the pollutants toxic effect on soils.
Computational supporting decision-making in self-government bodies using machine learning
Authors: Rakhimboev Kh J , Ismailov M A , Kh Khusinov H , Hakimov Z A , Khujaev O K 
Published: May 2021

Abstract
The article discusses the problem of building a model and algorithm for supporting decision-making in self-government bodies by machine learning. As a method of machine learning, a multiple linear regression method is selected for processing the training sample. In the training sample, independent data consists of parametric assessments in the numerical form of self-government organs in three areas of activity, as, education, social environment and crime. A dependent parameter consists of generalized expert assessments of self-government bodies, also in numerical form. A model and an algorithm for the decision support process for making decisions using the multiple linear regression method is built. Based on the built model and the proposed algorithm, the ratios of the function coefficients to support the decision-making are identified. With this model, a generalized expert assessment in a numerical form is determined for the new self-government body, which is interpreted as a proposed solution to improve the state of the object.
Quantitative assessment of biogenic elements and suspended matter load to inner-city river: the role of point sources and diffuse runoff
Authors: Sabanaev R N , Nikitin O V , Latypova V Z , Minakova E A , Yu Stepanova N 
Published: May 2021

Abstract
The article provides a quantitative assessment of the input of biogenic elements and suspended matter in the composition of the storm sewer outlets from the territory of the Kazan City (Russia, the Republic of Tatarstan) and the diffuse runoff of biogenic elements from the agro-developed catchments into the Kazanka River (left tributary of the Volga River) as the main risk factors for the development of anthropogenic eutrophication processes. Based on the results of long-term monitoring and the current background concentrations of total phosphorus, nitrogen and suspended solids in the recipient river, determined in the work, the impact of storm water discharge on surface waters within the Kazan City was assessed. The values of permissible loads of phosphorus and nitrogen mineral fertilizers on an agriculturally developed catchment are given for regulating the diffuse runoff of nutrients into a water body, depending on the hydrometeorological conditions of the territory, to a level that meets the basic environmental requirements for the quality of surface waters.
Development of the analytical potential of territoriel air monitoring measuring systems
Authors: Krupina N N , Kipriyanova E N , Smirnova V O , Vorobyova S V 
Published: May 2021

Abstract
Air monitoring makes it possible to zone the urban environment according to the degree of technogenic impact, using significant socio-ecological and economic indicators to optimize management decisions for a wide range of applied tasks of territorial strategic planning. Fuzzy expert assessment uses the representation of knowledge in the form of linguistic variables, so it is important to provide the developer of software tools with reliable characteristics of the subject area of monitoring. Based on the critical analysis of the known approaches to the ranking of the territory according to the criteria of environmental safety, a matrix method for zoning the territory of an industrial agglomeration is developed and discussed for the coordination of two indicators - «specific ecological and economic damage» and «the coefficient of localization of aerotechnogenic load from stationary sources of emissions». The indicators best reflect the complex pollution of the territory and the complex causal operational and natural links in the chain: «technology → gas purification system→ source of emissions → dispersion of substances in the surface layer of the atmosphere → formation of an active pollution zone → damage». Ignoring the role of the spatial factor reduces the diagnostic potential of existing predictive automated emission control systems. The author’s propositions are illustrated by the data on the air intensity of economic activity and the discussion of the prerequisites for the harmonization of Russian and international monitoring standards based on the principles of Directive 2004/3 5/CE11 of the European Parliament.