bluuebunny/crossref_metadata_2025_split huggingface dataset:
Scheduling of the independent projects
Authors: Kalach A V , Rossihina L V , Melnik A A , Sharapov S V , Loran N M 
Published: September 2020

Abstract
The article proposed a technique for the independent scheduling of the independent projects for the case when the value of labor expenditures is limited in each period of time. Continuous variant of the scheduling problem is considered when a partial fulfillment of the projects in the time interval is possible and discrete variant for two periods when a partial ful-fillment of the projects is not admitted. The generalized algorithm of the scheduling is presented for the case when the number of periods is more than two. A current optimality principle is proposed based on the technique «Cost-Effect», and according to it maximization of the total effect from the project fulfilled only in this period of time without the account of the next intervals is solved only in this period of time. Examples of the usage of proposed method for scheduling of the independent projects and a principle of the current optimality in solution of the problem of the project’s scheduling are presented in the work.
The spectral curve method for the Kaup-Newell hierarchy
Authors: Smirnov A O , Filimonova E G , Matveev V B 
Published: September 2020

Abstract
In nonlinear optics, ones often use models which associated with various variants of the nonlinear Schrödinger equation (NLSE): scalar NLSE, vector NLSE, derivative NLSE, etc. These equations are the first in their hierarchies: Ablowitz-Kaup-Newell-Segur, vector NLSE, Kaup-Newell, Gerdjikov-Ivanov, and Chen-Lie-Lui. A typical tool for analyzing the problem of propagation of electromagnetic nonlinear waves is the direct and inverse nonlinear Fourier transform. For recovering a periodic nonlinear signal one can use spectral curves. In this paper, we use the example of the Kaup-Newell hierarchy to show the possibilities of the spectral curve method. Using this method, one can find Lax pairs, integrable nonlinear equations, integrals, and spectral curves of solutions for any other hierarchies. The simplest examples of using this method are given.
Derivation of the simplest transport equations for dissipation and vorticity from a modified equation for small-scale velocity
Authors: Balonishnikov Alexander , Balonishnikova Jeanna , Kruchkova Julia 
Published: September 2020

Abstract
Transport equations for dissipation and vorticity are derived from a transport equation for small-scale velocity, using expression for turbulent viscosity through dissipation and gradients of large-scale velocity, assuming validity of local turbulent energy balance. These equations are of simple form. The equations can be used for parametrization in the various turbulence models. The approach can be generalized for magnetohydrodynamics, the flow with variable fluid density, the non-newton flow, etc.
Brachistochrone of weakly connected graphs
Authors: Dzerzhinsky R I , Mitina O A 
Published: September 2020

Abstract
This article is focused on studying brachistochrone dynamic spaces of weakly connected graphs trough the example of Moscow transportation system. Research data will show and allow users to find the shortest route around the city, and give recommendations on the further development of the metropolis. The indicated dynamically changing contours of weakly connected graphs will allow the user to optimally adjust the traffic, which may ultimately result in new traffic capacity. Research results and conclusions may be useful for the Ministry of Transport, Traffic Management Centre, and private organizations.
Mathematical methods for planning energy-efficient motion path of the manipulator anthropomorphic robot for the typical obstacles
Authors: Petrenko V I , Tebueva F B , Antonov V O , Gurchinsky M M 
Published: September 2020

Abstract
Anthropomorphic robots (AR) have a problem of low work duration, that negatively affects their functioning efficiency in different environments. The article discusses the optimization of its manipulators energy efficiency when performing operations in the working area with an obstacle to reduce the energy consumption of robots. Increasing the useful life of the anthropomorphic robot on one cycle of charging is the purpose of the study. This happens due to reducing the energy consumption of manipulators with excessive mobility when operating in the working area with a typical obstacle through the planning of energy-efficient travel path. The article shows the results of the method development for planning the path of the AR manipulator in the working area with a typical obstacle in the shape of a sphere or a parallelepiped. The method for solving kinematics problems based on a geometric approach for kinematic chains consisting of rotational joints using the Denavit-Hartenberg representation is presented in the paper. The computational complexity of the proposed solutions is analized, the efficiency of the developed methods and algorithms is evaluated. #COMESYSO1120
The effective algorithms for estimating the signal and image shift
Authors: Terekhov A V , Makarov A A , Melnikov K A 
Published: September 2020

AbstractIn the paper, there are introduced simple algorithms for the estimation of the shift parameter of signals and images synthesized by means of the spectral analysis carried out in the various orthogonal bases formed by the polynomials. It is demonstrated that the resulting estimates are asymptotically unbiased and consistent, and it is proved that they can be implemented using modern digital equipment.
Mazes creation for further study of swarm intelligence
Authors: Dagaev A V , Sorokin A A , Kovalenko R A , Yakovleva E A 
Published: September 2020

Abstract
The development of algorithms for graph theory and discrete mathematics has made it possible in recent decades to create labyrinths of varying complexity and structure. Labyrinths are used for tracing boards, developing puzzles, games, optimizing the filling of homogeneous structures, finding a path in complex dynamic structures and building graphs, analyzing it with swarm intelligence. The methods for generating mazes are varied and complex. The aim of the study was to conduct a comparative analysis of the speed and complexity of generating mazes to select the best algorithm for a given criterion. The better the developed algorithm, the more steps to find the path. The paper presents several methods for generating mazes.
Modeling of ultrasonic drilling of hard formation in the conditions on the Moon surface
Authors: Khmelev Vladimir N , Golykh Roman N , Es’kov Evgeniy A , Jiang Shengyuan , Liu Junwei , Quan Qiquan 
Published: September 2020

Abstract
The article presents developed model of ultrasonic drilling of hard formation in the conditions of the Moon surface. The model allows calculating the speed of ultrasonic drilling and the speed of evaporation of water and ice traces. The results of calculations revealed optimum modes of ultrasonic drilling providing maximum safety of water and ice.
A long period quasi-random sequences false synchronization probability estimation under organized interference conditions
Authors: Melnikov E V , Azhmukhamedov I M , Hisamov F G 
Published: September 2020

Abstract
It is known that the broadband communication systems functioning always begins with a long period quasi-random sequences sensors synchronization. In a false synchronization case, which is immediately detected by the received signal convolution absence, resynchronization can be carried out in organized interference difficult conditions from the intruders’ side. By now, a false start probability estimating issues remain open due to the obtaining mathematical expressions’ difficulty without knowing the errors’ distribution laws that lead to false start of a long period quasi-random sequences sensors synchronization. In this paper, theorems are proved on a long period quasi-random sequences sensors synchronization process isomorphism by the Ward method to the check relations fulfilment (k+m, k) of the maximum length code, which makes it possible using the coding theory theoretical apparatus to obtain fairly simple mathematical expressions for calculating a long period quasi-random sequences sensors synchronization false synchronization probability through the maximum length code undetected error (k+m, k) probability.
The problem of equality in the class of bracketed languages and its use in automation systems for building compilers
Authors: Melnikov B F , Melnikova A A 
Published: September 2020

Abstract
We investigate the solvability of the equivalence problem in the class of bracketed languages and its use in automation systems for building compilers. We obtain the necessary and sufficient conditions for the equality of two simple bracketed languages for the prefix-and-suffix case and some sufficient conditions for two bracketed languages.
Mathematical modeling of management processes in agricultural engineering systems
Authors: Siptits S O , Evdokimova N E 
Published: September 2020

Abstract
The task of forming a plan for the development of a plant growing enterprise belongs to the non-trivial tasks of mathematical modeling of bioeconomic processes. When forming it, the decision-maker must systematically take into account the impact on the final result of at least three types of factors of different nature: agronomic, economic, organizational. This paper presents a system of mathematical models that forms the basis for optimizing the annual plan for the production of agricultural crops.
Mathematical model of fire load type identification by electromagnetic radiation of the optical range using an unmanned aerial vehicle at oil and gas industry facilities
Authors: Vytovtov A V , Korolev D S , Odnolko A A , Nikolenko S D , Vytovtov V A 
Published: September 2020

Abstract
Providing comprehensive security of the pipeline is the main task of monitoring linear facilities in the oil and gas industry. Proposed mathematical model is a part of an automated identification algorithm to determine the fire load type. The study identified four groups of combustible substances characteristic of oil and gas facilities: oil, refined products, liquefied petroleum gas and vegetation. There was a study of electromagnetic radiation of the optical range, recorded by an UAV’S digital camera for each type of substance. An algorithm for comparing the area color with a standard was proposed and implemented. The obtained mathematical correspondence allows identifying the fire color and the fire load type in conditions of different luminosity. The information on the flaming substance allows authorized rescue units to make operational decisions about the fire extinguishing method.
Detonation combustion in a dual-circuit ejector pulsating jet engine
Authors: Migalin K V , Egorov A G , Sidenko K A 
Published: September 2020

Abstract
The results of the development of a new generation pulsating engine – an ejector dual-circuit PuVRD capable of under certain conditions going into detonation combustion mode are presented. It is assumed that in the engines of this type, having a double bend duct, the transition to detonation combustion is performed by precessing vortex core separation zone. The possible cause of the failure of the self-oscillating process during the transition to detonation combustion mode is analyzed.
The cyber-production syndinical situation
Authors: Gurjanov A V , Shukalov A V , Zharinov I O 
Published: September 2020

Abstract
The cyber-production syndinics defines the dangerous factors, which are actual for the Industry 4.0. The ecology, process (technological), economy and other directions of the company security are being analyzed. There is a scheme of the cyber-production security policy components. The cyber-production security system threats are studied inspired by random reasons and third persons intended actions (competitors, hackers, un-loyal employees and other). The random reasons could be cyber-equipment functioning failures. The intended reasons are associated with terrorists cyberattacks and some malevolent physical penetration in a secured area. The security system threats parrying is given to the engineer cyber-systems, which have the security functions. There is a scheme given of a cyber-production protected section equipped with security cyber-systems. The risk factors influencing the industrial object security are defined if they potentially could provoke a technogenics catastrophe. The cyber-production technical security components are defined as the physical world and cyber-space building security infrastructure.
Analysis of electric power technologies in industrial production
Authors: Testoyedov N A , Potapenko I A , Lugovaya N M , Kukartsev V V , Karaseva M V 
Published: September 2020

Abstract
The article carries out a general analysis of electric power technologies in industrial production in the course of this study. It substantiates the importance of the electric power industry in the world economy. The most developed directions of electricity generation are considered. Their peculiarities and characteristic features are highlighted. The article gives a general analysis of the structure of world electricity production by types of power plants. It was revealed on the basis of this analysis that the largest volume of electricity generation is produced at coal fired power stations. A negative impact of the operation of coal-fired thermal power plants on the environment is described. The dynamics of world investments in renewable energy sources, as well as world GDP statistics and the dynamics of world electricity production according to regions are considered. The article highlights such regions as China, Europe and the United States, which are leaders in both production and consumption of electricity. They receive the largest investments for the development of technologies for generating electricity from renewable energy resources. As a result of the study, the assumptions were made about the existing environmental problems in some regions leading in the production and consumption of electricity. Also the article speculates about the existing need to replace less environmentally friendly energy sources with more environmentally friendly energy resources.
Estimation of economic damage in the difference of the transformer loading factor
Authors: Lukovenko A S , Radionov T V , Kukartsev V V , Testoyedov N A , Karaseva M V 
Published: September 2020

Abstract
The article considers a method to determine the optimal load of a power transformer. A method for estimation economic damage in case of deviation of the load factor of the transformer has been developed. According to the proposed method, the optimal load factor of the power transformer was determined according to the criterion of the minimum cost of money for the transformation of electric energy. The load level of power transformers can be estimated by two criteria, i.e., by the maximum integral value of the efficiency and by the minimum loss of funds during the transformation of electricity. According to the proposed methodology, the damage was estimated when the load factor of the transformer deviated from the optimal values. For this, the relative losses of electrical energy were calculated. The results obtained, from the point of view of energy and financial and economic efficiency, show that when the load factor is overestimated relative to the optimal values, it is much more preferable to overestimate them than to underestimate them.
Calculation of the process of nitrogen oxides formation during combustion of methanol in the engine
Authors: Lopatin O P 
Published: September 2020

AbstractThe developed method is based on a two-zone model and allows calculating the pressure and temperature (fresh mixture and combustion products), cycle indicators, as well as the current concentration of nitrogen oxides (NO) in the combustion chamber as a function of the crank angle. It can be used to evaluate the influence of parameters such as the beginning and duration of combustion, the composition of the mixture, heat loss from the gas to the walls, compression ratio, etc. on indicator indicators and output. In this model, the cylinder charge during combustion is divided into two zones: the zone of unburned mixture and the zone of combustion products. It is assumed that the fuel-air (unburned) mixture before and during the combustion process is homogeneous. The zone of combustion products at each moment of the cycle has a uniform composition and temperature. The combustion process is calculated according to the specified fuel burn-out law, taking into account the dissociation of the combustion products. The equilibrium concentrations of individual combustion products necessary to account for dissociation (COandH2) and the formation ofNO(O2,H2,O) are determined by approximating polynomials.
Methods for evaluating the performance of industrial cooling tower sprinklers
Authors: Boev E V , Boeva N I 
Published: September 2020

Abstract
The temperature regime of any production is carried out using recycled water systems, most often equipped with fan and tower cooling towers. The main element of all types of cooling towers, affecting the efficiency of the interaction of the droplet liquid with the ascending air flow and, accordingly, the efficiency of the cooling towers, is the sprinkler. This article describes a method for investigating the effectiveness of cooling tower sprinklers.
Improvement of fire retardant properties of wood materials
Authors: Gazizov A M , Kuznetsova O V , Sharafutdinov A A , Shaimuhametova K M 
Published: September 2020

Abstract
Any kind of construction involves the use of wooden structures that require the achievement of an appropriate class of their fire hazard with the provision of the required fire protection indicators. Currently, fireproofing of wood materials is carried out mainly by impregnating wood with fireproofing compositions. And the search by scientists for relatively cheap and environmentally friendly fire retardant materials (flame retardants) for impregnating and treating wood is still relevant. This article discusses the role of fire retardant for wood material. The experimental study using 4% tetraethoxysilane is described. An optimal method of applying a composition for increasing fire resistance and a fire-retardant efficiency group of the test composition have been experimentally established. The positive effect of this composition on the fire-retardant properties of the wood chip board was also established. Time characteristics during soaking and drying of samples are recommended.
Alternative fuels and assessment of their applicability in internal combustion engines
Authors: Kopchikov V N 
Published: September 2020

AbstractThe article summarizes the experience of using alternative fuels as motor fuel in internal combustion engines (ICE). Russia’s long-term energy program provides for measures to save fuel and energy resources, replace oil fuels with natural gas and other alternative fuels of non-oil origin, and expand the use of secondary and non-traditional energy sources. To justify the form of alternative fuels should consider the following factors: motor properties, availability of raw materials for its production in large volumes for a long time, the presence of large technologies, systems of transportation and distribution for the consumer, environmental indicators in the work ICE at this fuel, the cost of production and distribution of fuel. The article considers natural gas, alcohols (methyl and ethyl), hydrogen, ammonia, hydrazine, and synthetic hydrocarbon fuels from shale and coal as the main alternative fuels for replacing fuels of petroleum origin. Taking into account the above factors, the most interesting are natural gas (compressed and liquefied), hydrogen, and methyl alcohol (methanol).
Investigation of heat and mass exchange characteristics of packing devices of industrial cooling tower sprinklers
Authors: Boev E V , Boeva N I 
Published: September 2020

Abstract
In practically all enterprises of gas and petrochemical industry cooling of main and auxiliary process equipment is carried out by means of recirculated water supply systems equipped with cooling towers. In general, the efficiency of the cooling process is determined by packing devices (sprinklers) designed to provide the necessary contact surface of the phases with minimal aero- and hydrodynamic resistances. This article describes the design of the cooling tower sprinkler
Aeroecology of audience with split systems
Authors: Lykov I N , Kusacheva S A , Safronova M E 
Published: September 2020

Abstract
The purpose of the study is to assess the level of bacterial and fungal contamination of the split system elements and air in air-conditioned rooms. The research method included the quantitative accounting of microorganisms on the surfaces of split-system filters and in the air of university classrooms. It was found that after an hour operation of the air conditioner, the number of microorganisms in the air decreased by 41.4%. At the same time, the microbial landscape changed in the direction of increasing the percentage of molds and coccal microorganisms, which indicates a high risk of atmospheric pollution in the classrooms.
Alternative fuel engine duty cycle
Authors: Anfilatov A A 
Published: September 2020

AbstractIn developing promising systems for reducing the toxicity of ICE emissions, special attention is paid to suppressing the formation of toxic components directly in the engine’s working chamber. This primarily relates to nitrogen oxides. The method is of particular interest when using aqueous solutions of ethanol as fuel. Therefore, the study of the ignition and combustion capabilities of various fuels includes the study of the prospects for using water-saturated air-fuel mixtures in a multi-fuel operating cycle to reduce the emission of nitrogen oxides. It is assumed that the formation of shock and detonation waves as a result of self-ignition in local foci is acceptable if they propagate attenuate to a level that does not pose a danger to the engine design and does not impair its effective performance.
Speed characteristics of a diesel running on biofuel
Authors: Fominykh A V , Kopchikov V N 
Published: September 2020

AbstractUsing alternative fuels in diesel engines is a complicated task, as it is necessary to take into consideration further changes in power, economic and environmental characteristics. There are fuels that are very similar as to their chemical properties to conventional petroleum fuel. However, when using them one should bear in mind some of their specific features, such as cetane number, lower heating value, the proportion of carbon, hydrogen, and oxygen in their composition, etc. All of these can have a significant impact on the workflow. The most promising of the samples investigated are renewable alternative fuels, such as methyl alcohol and rapeseed oil methyl ether. The paper presents the results of bench tests of a 2F 10.5/12.0 diesel engine operating on the above-mentioned biofuels. Consideration is given to power, economic and environmental performance of the engine depending on the speed change, and the possibility of using alternative fuels in diesels is assessed.
Influence of emulsion fuel on the composition of dispersed particles
Authors: Likhanov V A , Anfilatov A A 
Published: September 2020

Abstract
The research data on the effect of water-fuel emulsion on the composition of dispersed particles contained in diesel EGes are presented. The effect of the membrane emulsification method on the degree of homogeneity of the emulsion is also shown. Management of the structure of the emulsion which will allow to obtain VTE of a predetermined composition and, accordingly, to ensure stability and reproducibility of the results of their application. In most works, VTEs were prepared using homogenizers, ultrasonic devices, or other mechanical methods that cannot ensure the stability of the structure of emulsions.