bluuebunny/crossref_metadata_2025_split huggingface dataset:
Calculation of initial dynamically unstabilized sections in the elements of liquid rocket engines turbopump units
Authors: Zuev A A , Arngold A A , Nazarov V P , Mehtieva V N , Khodenkova E V 
Published: May 2021

Abstract
The article considers an analytical approach to the relative characteristic parameters determining in the initial hydrodynamically unstabilized sections. Using the momentum equation, analytical equations are obtained for the dynamic boundary layer thickness determining. Laminar and turbulent flow regimes were considered. It is noted that the initial sections are characteristic for the flow around such surfaces as: blades of turbines and centrifugal pumps, nozzle elements, cavities between the casing and the rotor of the turbopump unit. In the flowing parts of liquid propellant rocket engines turbopump units, relatively short spatial channels, characterized by the presence of non-merged dynamic and temperature boundary layers prevail. The initial section significantly affects the flow regime, length loss and heat exchange processes. The analytical dependencies obtained cover a wide range of flow regimes and are in good agreement with the experimental data of other authors. An approach is given to determine the hydrodynamic parameters for the initial sections that affect the overall flow pattern in complex spatial channels with different degrees of curvature in the presence of a pressure gradient.
Self-adapting automated mode control system of packed absorbers used for selective gas emission treatment
Authors: Persidskiy A V , Merentsov N A , Golovanchikov A B , Tezikov D A , Groshev V V 
Published: May 2021

Abstract
This paper describes the designed self-adapting automated mode control system of packed absorbers used for selective gas emission treatment. It contains the description of automated control chart of the packed absorber and the algorithm of control program of the mass exchange system. The paper covers the principle of self-adapting control and steady maintenance of emulsification (phase inversion) mode depending on existing concentrations to be collected from continuous gas phase flow.
Preparation of solutions of copper and nickel en and dien complexes- an illustration of the Jahn-Teller effect
Authors: Takaeva M A , Bisergaeva R A , Sirieva Y N 
Published: May 2021

Abstract
With the advent of methods that effectively solve the problems of modeling metal ions in the gas, water, and solid phases, computational tools are becoming increasingly important in chemical research. here we consider both quantum and classical strategies for modeling systems containing metal ions that have been developed over the past few decades. This experiment was performed to study solutions of copper (II) and Nickel (II) complexes containing the following ligands, such as ammonia, diene, ene, and water in molar ratios, and to characterize the visible spectrum of the prepared solutions. The research was divided into three parts. In the first part, Nickel complexes were prepared and their formulas were determined using the job method. The second part of the experiment was performed to obtain EN-complexes of copper (II), and in the last part diene complexes were obtained. Dien and en were used as ligands.
Frequency dependence of magneto-optical phenomena in nonmagnetic dielectric nanostructures
Authors: Jumaev Mustakim , Sharipov Mirzo , Rizoqulov Mirzokhid , Ergasheva Nilufar 
Published: May 2021

Abstract
The frequency dependences of the Faraday rotation angle and the ellipticity angle are studied taking into account light absorption in dielectric media. The extreme values of the above values are determined, as well as the field of their application in dielectric media.
Evaluation of the adhesion strength of linear filler fibers of composite polymer reinforcement
Authors: Ganziy Yu V , Churkin A V , Dementev V B 
Published: May 2021

Abstract
The article discusses a method for evaluating the adhesion strength of linear filler fibers by tangential stresses obtained during shear tests of end cylindrical axisymmetric beads on a composite polymer reinforcement rod. The geometric parameters and material of the tested samples, the used equipment, the measuring instruments and the results of the tests are presented.
Extraction of eugenol, a natural product, and the preparation of eugenol benzoate
Authors: Bisergaeva R A , Takaeva M A , Sirieva Y N 
Published: May 2021

Abstract
This experiment was carried out to extract the eugenol from cloves in the part A, also to prepare the eugenol benzoate in part B. The experiment conducted, extraction of the essential oil eugenol from cloves. To perform this experiment cloves and water were mixed together and heated by a heating mantle in a round-bottom flask. A direct stem distillation took place, and the oil product was out aside for two weeks. After two weeks, the extraction of the eugenol and the preparation of eugenol benzoate actually took place. Next the light yellow eugenol from part A was characterized by the thin-layer chromatography (TLC) plate and 1H NMR analysis; however, eugenol benzoate from part B also was characterized by 1H NMR and Melting Point analysis. The products were analysed to check the purity, and to make sure there are no impurities. The experiment involved the use of techniques, such as steam distillation, gravity filtration, vacuum filtration to collect the product, recrystallization to purify the product, and the weigh to weight out the products.
Sample Clock Offset Compensation in the fifth-generation new radio Downlink
Authors: Assaf Mohammad , Ponomarev Oleg G 
Published: May 2021

Abstract
In this paper, the authors investigate the issue of sampling clock offset (SCO) in fifth generation new radio systems. Due to the imperfect SCO estimation methods, the correction methods relying on the SCO estimation will not be perfect, so the proposed method directly corrects the effect of SCO without using any kind of estimation methods. Our method can work well in physical downlink shared channel (PDSCH) and use reference signals as recommended by the 3rd generation partnership project (3GPP) standards. Through system-level simulations, the obtained results show that the throughput of the system is improved where the gain difference between the proposed method and the case without SCO compensation arises to reach 25 % over tapped-line (TDL) channel.
Study of mechanical characteristics by nanoindentation of an ion-implanted Ti-Ni shape memory alloy
Authors: Yu Usanova O , Stolyarov V V , Ryazantseva A V , Sh El’-Bekai B 
Published: May 2021

Abstract
This article examines the effect of ion implantation on the change in the mechanical characteristics of the Ti-Ni shape memory alloy. A comparison of the characteristics was carried out in the coarse-grained and nanostructured state on the initial alloy samples and on the samples after ion implantation. The implantation mode was chosen as the most optimal on the basis of previous studies. Irradiation mode parameters: dose - 2.3·1017 ion/cm2, energy - 40 keV, ions -nickel, temperature - did not exceed 200 °C. The characteristics were studied by the nanoindentation method on a NanoHardnessTester, (CSM Instr.) At a load of 2 mN using a Berkovich-type diamond indenter. According to the data of nanoindentation by the Oliver-Pharr method, the value of hardness and Young’s modulus of elasticity were determined. Research results show that ion implantation leads to an increase in hardness.
Questions of type selection of lighting devices for underwater telecommunication television systems
Authors: Martynov V L , Skripnik I L , Ksenofontov Yu G , Kaverzneva T T , Pshenichnaya K V 
Published: May 2021

Abstract
The problems of studying the underwater part of the water area through the lens of ecology exist all over the world. Difficulties associated with the study of the ecological state of the hydrosphere pose for modern engineers the task of developing specialized autonomous underwater robotic systems, as well as using telecommunication means to transfer information from them to the shore or ship. Due to the fact that visibility under water has a limited range, that is, it is possible to observe underwater objects only from a close distance, it is proposed to use underwater telecommunication television systems that function in conjunction with lighting devices. The article presents the results of an experiment carried out in a marine aquatic environment, on the basis of which the expediency of using light searchlights and laser devices in the near and far zones in underwater search systems is substantiated.
The effect of twisting of cable elements on its stress-strain state during bending
Authors: Ismailov G M , Nizhegorodov A I , Nevinitsyna V S , Notkina V O , Osipkina Y A 
Published: May 2021

Abstract
The paper considers the stress-strain state of cables of various designs under bending deformations. Using the Ansys program, the tribological interaction of cables with twisted and parallel-laid conductors is simulated, the contact interactions of its individual elements are determined. Analysis and comparison of the stress-strain state of cables will make it possible to assess the strength of materials and create the required cable design, depending on the operating conditions. These results can be used to create high-reliability cables at the design stage.
Environmental information system for monitoring landscaping objects
Authors: Popov A A , Avdeeva E V , Ovsyankin A K , Emomaliev M R 
Published: May 2021

Abstract
Today, as a result of the ongoing processes that take place in production, many pollutants enter the atmosphere, which have a negative impact on the environment. The city has accumulated many environmental problems, and the population is not fully aware of these gaps. And also for their solution, for the optimal organization of the activities of various management structures, complex cartographic information is needed. The relevance of the topic being developed is due to the fact that landscaping and gardening is the most important area of activity of the municipal economy. The tasks of optimizing the ecological urban environment, eliminating the consequences of negative impact on the environment, planning various natural-economic and sanitary-hygienic works, as well as the accumulation, processing and provision of information through the introduction of an ecological information system are being solved. The goal is to increase the level of ecology of the city by introducing a balanced ecological system of landscaping, combining urban and suburban green spaces; in the continuity of the processes of its qualitative renewal in space and time.
Reengineering of organizational and technological processes of NPP construction
Authors: Voronkov I E , Usmanov T A 
Published: May 2021

Abstract
Nuclear power construction is characterized by high capital costs, a significant number of participants in the design and construction processes. One of the most significant factors of the efficiency of NPP projects implementation is the adopted technology for the construction. An analysis of the Soviet and modern experience in the NPPs construction allows to assert that the piece reinforcing application leads to an increase in the project implementation time. The technology of large-block assembling of NPP structures and equipment have been widely used by the world leaders in NPPs construction, but the implementation of this technology required significant costs for the organization of the necessary infrastructure. In the context of the rapid development of computing systems, instrumentation and mechanical engineering, it is proposed to fundamentally rethink the processes of NPP construction. It is proposed to return to the technologies of large-block installation of NPP structures by switching from rail lifting mechanisms to pneumatic wheels, by robotizing the processes of enlargement and installation of structures and equipment. The functions of managing and making organizational and technological decisions can be partially transferred to a specially developed neural network that has access to an array of data on previously implemented projects. This approach allows us to consider the NPP construction project as a cyber-physical system and opens the way to a whole range of areas of fundamental and applied research in the field of technology, organization and management of the construction of NPP.
Mean velocity profile for turbulent Taylor-Couette flow, deduced from generalized local balance model
Authors: Balonishnikov A M , Korshakova I A , Kruchkova J V 
Published: May 2021

Abstract
Mean velocity profile for Taylor-Couette flow was obtained by means of the angular momentum conservation law, the local balance of kinetic turbulence energy and the dissipation transport equation. The resistance law was derived by a simple method. A comparison with the experiment was made for rotating inner cylinder, the outer cylinder was at rest.
Building a business process management model for a «smart» enterprise
Authors: Nurgaliev R K , Shinkevich A I 
Published: May 2021

Abstract
The article examines the possibilities of using Petri nets in the context of automated business process management of a «smart» enterprise. On the basis of the studied methodology, a system Petri net is built, adapted to «smart» production. The network architecture is clearly presented and deciphered in detail, events and transitions implemented within the framework of various functional subsystems of an industrial enterprise integrated into a single information platform are described. The proposed Petri net can help reduce the transaction and transformation costs of reengineering associated with the digital transformation of the enterprise.
Numerical algorithm for the problem of the technological process of filtering low-concentrated suspensions
Authors: Yu Palvanov B , Saidov U , Sharipov M 
Published: May 2021

Abstract
The paper presents a mathematical model in the form of a second-order nonlinear differential equation with initial and boundary conditions and a numerical method for solving the problem based on the finite-difference method of the technological process of filtration of low-concentration suspensions to determine the ranges of variation of the ion-exchange filter parameters, as well as the results of computational experiments. When developing a mathematical model, the following main filter parameters and physico-mechanical properties of solutions (liquids) were taken into account: filtration rate, rate of sedimentation of gel particles on the pores of the filter, filter porosity, filter layer thickness, kinetic coefficient, dynamic viscosity coefficient and outlet concentration of the suspension. The developed mathematical model and a numerical solution method allow determining the deposition rate of gel particles in the pores of the filter, the outlet concentration of the solution and changes in the concentration of the driving solution of the ion-exchange filter.
Analytical model of a shielding enclosure populated with arbitrary shaped dielectric obstacles
Authors: Ivanov A A , Komnatnov M E 
Published: May 2021

Abstract
This paper proposes a new analytical model for an approximate evaluation of the shielding effectiveness (SE) for an enclosure populated with arbitrary shaped dielectric obstacles. The model is based on the enclosure equivalent circuit method proposed by Robinson et al. Dielectric obstacles are taken into account in the calculation of the characteristic impedance and the propagation constant for each regular part situated along the enclosure length. To do this, the model uses the effective value of relative permittivity, which is determined in the cross section of each regular part from a simple percentage ratio. Using the proposed model and the finite element method, the SE calculations were performed for three typical enclosures populated with different dielectric obstacles. The obtained results are in good agreement, and the average value of the absolute error does not exceed 4.4 dB.
The dynamic stochastic model of a boiler unit
Authors: Kutsy N N , Podkorytov A A 
Published: May 2021

Abstract
The goal is to develop a model that takes into account the boiler unit furnace device dynamics. The D J Box and G Jenkins technique used to identify the steam production process is considered. As the object of the study selected a boiler unit, which is quite complex and interconnected. Its description is a dynamic stochastic object with uncontrollable indignant influences. Statistical methods have obtained a mathematical model, which can be used to predict and regulate dilution in the boiler furnace.
Influence of a center of mass position on beam natural frequencies of vibration
Authors: Mityaev A E , Kudryavtsev I V , Ivanov V A , Khomutov M P , Kolotov A V 
Published: May 2021

Abstract
The paper discusses the effect of beam center of mass displacements on the values of their first natural vibration frequencies. Three schemes of beam restraint with a displacement of the center of mass along all axes of a coordinate system and around them are considered. It is established that if the center of mass is in the center of the beam, then any of its small linear and angular displacements slightly affect the first natural frequencies of vibration. If the center of mass was near the support, its longitudinal displacements along the beam will significantly affect the first natural frequency of bending vibrations. The transverse displacements of the center of mass will change only the natural frequencies of the torsional vibrations of the beam, which are usually quite small. Small angular displacements of the beam center of mass do not change the first natural frequencies of vibration at any location relative to the beam.
Main approaches to the development of mechanical engineering as an echelon of economic dynamics
Authors: Tikhonov G V 
Published: May 2021

Abstract
In the present article the specificity and basic directions of development of domestic mechanical engineering are considered. The optimality of a choice of progressive system of maintenance including procedures of fast management of manufacture of production, allowing raising efficiency of administrative and financial work at the enterprise, and also competitiveness of let out production is proved. This allows improving the organizational and economic model of operational production management, focused on improving the competitiveness of the machine-building enterprise products.
Metrological support integration in conditions of digital transformation
Authors: Dudukalov E V , Munister V D , Zolkin A L , Galanskiy S A , Rudnev S G 
Published: May 2021

Abstract
The article formulates the problems of the development of measurement control regulators in digital platforms. Attention is paid to the role of the digital revolution and metrology on the economy of enterprises and the transformation of the service sector model as a whole. Attention is paid to the impact of the digital revolution and metrology on the economy. The article presents and substantiates the policy of introduction of metrological support for innovative development in the context of the digital cybernetic revolution. The proposed policy pays attention to the consideration of the fundamental model of cyber-physical systems, as a technological basis for the implementation of a new industrial evolution in metrological context. The importance of organizing of measurement principles in network infrastructure and communication protocols in the context of economic transformation is emphasized. A model of the use and implementation of chaos engineering and information technologies in metrological apparatus is considered.
Results of the study of desert soil as a source of surface runoff formation
Authors: Saidova M , Yunusov I , Talipova D , Shafkarov F 
Published: May 2021

Abstract
The Kyzyl Kum Desert in Uzbekistan has not been adequately studied, despite the fact that it occupies more than half (68.7%) of the country’s territory. Even in ancient times, the lands of Kyzyl Kum were used as pasture and now these lands are a classic example of distant pasture animal husbandry, including karakul breeding. The industry is developing with guaranteed sales markets, whose products are export items. In the desert, the main factor in the cultivation of crops is the lack of water resources, and the resources of the rivers of Uzbekistan are almost completely depleted. The aim of the study is to scientifically substantiate the possible volumes of surface runoff in the desert, which could be used in the interests of agricultural production, as well as for the creation of local systems of domestic drinking water supply.
Physical and mathematical measurements of potential hazard during storage of diesel fuel at the tank battery
Authors: Zhuravleva N G , Shcherbina A F , Pankratova M E , Yu Aleksandrova E , Trotsenko A A 
Published: May 2021

Abstract
The article briefly describes the results of calculations of probable potential accidents (emergencies) at a technical facility designed for storing diesel fuel at a tank battery and their consequences for humans and the environment. The calculations considered the most important parameters: the amount and hazard class of substances, the volume, and area of industrial premises, temperature and pressure fluctuations, the distance of personnel from the damaging factor, etc. It was revealed that such types of accidents as an explosion of a fuel-air mixture, a pool fire, jet fire, an explosion inside equipment, an explosion inside a building are possible at this enterprise. As a result of calculations, it has been established that the most likely accident will occur in case of partial depressurization of the pipeline and the formation of the pool fire, the number of the forecasted casualties is 1 person.
Determining the linear network code parameters to minimize the destructive factors influence in telecommunications systems and networks
Authors: Britvin N V , Karpukhin E O 
Published: May 2021

Abstract
The paper analyzes the searching results for the linear network code optimal parameters using a binary symmetric channel and queuing models. A conclusion is made about the correcting ability dependence and the code sequence length on the bit distortion and overloads probability in networks. The study showed using the network coding method possibilities and limitations to counteract destructive factors in the network. The conclusion is made about the code parameters choice with correlated packet losses and the combined use of both models.
Influence of the rotor speed of the water-ring pump on the vacuum transport unit operation
Authors: Naumov V A 
Published: May 2021

Abstract
Vacuum transport units based on water-ring pumps are used for pumping aggressive liquids. The previously developed mathematical model of the liquid pumping process was used to assess the effect of changes in the rotor speed. The load characteristics of the ELRS-45 water-ring vacuum pump from ERSTVAK were used in the calculation. The numerical method was used to solve the system of differential equations. Increasing of the rotor speed leads to a decrease in the absolute pressure in the tank at the end of the first step. As a result, the volume of liquid pumped in one cycle increases significantly. The average performance of the unit is significantly increased. While energy efficiency decreases. The calculated parameters allow you to select the characteristics of automatic control of the system.