bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on retail channel decisions considering consumer’s fairness concern
Authors: Huang Mengli , Zhang Yulin , Fan Haowen
Published: November 2021

Online retailing provides alternative shopping channels, where the retail platform can either let manufacturers directly sell to consumers or open a self-operated channel, or even both. Regardless of sales channels, consumers often pay attention to the income gap between themselves and enterprises (namedconsumer’s fairness concern). In this work, we explore how consumers’ fairness concerns affect the optimal decisions of both manufacturer and retail platform under different retail channel modes (single-channel mode and mixed-channel mode). The results show that consumer’s fairness concern has a negative impact on the retail price under low production cost in single-channel mode, while the retail prices in mix-channel mode are jointly determined by consumer’s fairness concern and revenue sharing ratio. Besides, if the market channel mode has not yet formed, the retail platform can choose either a self-operated channel or manufacturer consignment channel, depending on the consumer’s fairness concern level and revenue sharing ratio. By contrast, if the market channel mode has already been formed, the retail platform should make effort to reduce consumer’s fairness concern if only the self-operated channel exists, while maintain consumer’s fairness concern and revenue sharing ratio at a moderate level if there exist mixed channels.
Gender aspect in psychological support of Russian teachers of foreign schools
Authors: Pozdnyakova Alina Aleksandrovna , Markova Elena Mikhailovna , Dmitrieva Darya Aleksandrovna , Baychuk Elena Aleksandrovna , Morozova Larisa Yurievna
Published: November 2021

“Staff feminization” of the Russian schools is a general tendency of the modern education, however, the problems that female teachers face when performing their professional activity in a foreign cultural environment are rather specific and therefore they require the most careful consideration and further correction through the system of psychological support. The study of the mechanism of psychological support, as well as the methods of its implementation, is the objective of the present article. The tasks of the research are the following: 1) determination of the stress factors, accompanying the activity of the female teachers of the Russian school abroad; 2) selection of the contemporary psychological techniques required for neutralization of the stress factors; 3) formation of a cluster of measures required for psychological support of teacher of Russian as a foreign language; 4) modelling of the educational content directed to the formation of the psychological competencies of the Russian teacher of a foreign school. The system of psychological support has two levels and includes the following measures: 1) prevention of the impact of negative factors and 2) liquidation of the competency-based lacunes in the field of psychological knowledge. Taking into consideration the specific character of a foreign cultural environment allows determining the individual trajectories of the professional development of a teacher. The system of psychological support is not closed; it should be updated and improved constantly taking into account and under the influence of the demands of the time to become a part of the mechanism of the general training of a teacher of the Russian school abroad.
Labor, gender and governance in terms of establishment of new technological order
Authors: Vasilenko Liudmila Aleksandrovna , Vasilenko Sergey Vladimirovich
Published: November 2021

The prerequisites for the study are the transition of the world social system to the Technological Orders VI and VII in the context of a digital breakthrough and the hybrid nature of the digital social space, which significantly affects the change in the social structure, the distribution of social roles in society, the formation of the labor market and the formation of a new gender order. The purpose of the study is to analyze the impact of digitalization on the labor market, on the gender balance in the labor market and formulate how the processes of preparing a person for new technological structures should be built. According to the results of the study, the authors note that the formation of social institutions of a new type in a hybrid digital society significantly lags behind the need, digital regulators of social behavior in the labor market have not yet emerged, which does not allow building norms and rules of life in a virtual social space at the legislative level. The cognitive structures of society are immature, adequate incentives and sanctions as a response to the phenomena of crossing the boundaries of the office set framework by social actors have not been formed. There are no frameworks yet, but they can be created by maintaining a balance between the realization of society’s needs for development and relying on its ability to maintain the stability of the value system, i.e. property of resistance.
Construction of the Ishikawa diagram for the incorporation into employment of graduates of the Ministry of emergency situations of Russia
Authors: Mikryukov Vladimir Olegovich , Melkov Sergey Anatolievich , Lyabakh Andrey Yurievich , Ilyushin Sergey Nikolaevich , Boeva Aleksandra Olegovna
Published: November 2021

The paper presents the results of the author’s study of the problem of employment of universities graduates of the Ministry of Emergency Situations (EMERCOM) of Russia for vacant posts in the EMERCOM of Russia. The purpose of the study is to develop a draft “road map” aimed at solving the management problem of insufficient active participation of EMERCOM universities in the employment of graduates for civil service in the EMERCOM of Russia. The authors have used the following methods: traditional document analysis, expert sociological survey in the form of a questionnaire; method of studying statistical data; method for constructing the Kaworu Ishikawa chart. As a result of processing statistical data and experts’ answers, the paper presents the author’s view of the draft “road map” the implementation of which will solve the problem of effective employment of graduates of EMERCOM universities. The paper presents for the first time the results of the causal relationship between the need for employment of graduates of EMERCOM universities and the low percentage of this employment presented in the form of the Ishikawa chart.
Labour migration: Legal means of regulation in the context of contemporary challenges
Authors: Andrichenko Ludmila Vasilievna , Plyugina Inna Vladimirovna
Published: November 2021

For a long time, the Russian Federation has been one of the world’s leaders in terms of the number of international migrants, a significant proportion of which are labour migrants. This required the development of a legal framework that would make it possible, on the one hand, to ensure the security of the state and the host society, create conditions for a prompt and flexible response to the situation in the labour market, and, on the other hand, protect the rights and freedoms of foreign nationals working in Russia, and create an attractive migration climate. The article highlights the current developments in the statutory regulation of labour migration, the legal means used to respond to modern challenges and formulates the major problems facing government bodies. Purpose: on the basis of an analysis of the development of the migration legislation of the Russian Federation, to identify the features of the regulation of labour migration and determine the areas of modernisation of the legal framework in that field. Basic methods: formal-logical, system-structural, special-legal, comparative-legal; content analysis, etc. Results: by evaluating the dynamics of legal regulation of labour migration in the Russian Federation in recent decades, the following features can be distinguished: detailed and differentiated legal status of various categories of foreign nationals involved in labour activities in Russia; the focus of legislation on the use of flexible mechanisms for foreign labour intake, which presuppose taking into account professional qualities and the level of qualifications; increased role of supranational regulators in the legal regulation of migration relations (CIS, EAEU, etc.); introduction of the technological advance achievements into the public administration mechanism which made it possible to improve control measures and migration registration etc. The developed legal means for regulating migration processes need interval updating in order to ensure an adequate response to changes in political, social, economic and other conditions, effective impact on the migration situation by taking into account the purpose and intent of the state migration policy.
Association between Adenoid-Nasopharyngeal Ratio and Tympanogram Width in Adenoid Hypertrophy Patients
Authors: Utama Muhammad Arif Sudianto , Kentjono Widodo Ario , Ekorini Haris Mayagung
Published: November 2021

IntroductionAdenoid hypertrophy is a change in adenoid size that can lead to obstruction the Eustachian tube and become a risk factor for otitis media effusion (OME) in children. Standard objective examination of adenoid hypertrophy uses adenoid-nasopharyngeal ratio (A-N ratio) based on correct lateral skull radiography. Adenoid hypertrophy is one of the factors causing OME in children. There is still much debate about the association between A-N ratio and tympanogram width (Tw). Determining the association of A-N ratio and Tw in adenoid hypertrophy patients.

MethodsParticipants performed a true lateral radiographic examination using Fujioka method to determine A-N ratio, and Tw to determine middle-ear pressure. The distance between examination of A-N ratio and tympanogram examination was at maximum of ∼1 week. The association between A-N ratio and Tw in patients with adenoid hypertrophy used the Pearson correlation test. This research employed significance levelp< 0.05.

ResultsMost participants were aged between 6 and 10 years (38.10%), male patients (57.14%), and the symptom most participants complained of was snoring during sleep (38.10%). Most participants had A-N ratio of 0.53 to 0.70 (61.90%) with an average of 0.60 ± 0.05. The average value of Tw measurement was 102.83 ± 50.03 daPa (r= 0.605;p< 0.001).

ConclusionThere is a significant association between A-N ratio base on true lateral radiographic examination and Tw in adenoid hypertrophy patients.
Treatment Modalities for Anastomotic Leakage in Rectal Cancer Surgery
Authors: Keller Deborah S. , Talboom K. , van Helsdingen C.P.M , Hompes Roel
Published: November 2021

Despite advances in rectal cancer surgery, anastomotic leakage (AL) remains a common complication with a significant impact on patient recovery, health care costs, and oncologic outcomes. The spectrum of clinical severity associated with AL is broad, and treatment options are diverse with highly variable practices across the colorectal community. To be effective, the treatment must match not only the patient's current status but also the type of leak, the surgeon's skill, and the resources available. In this chapter, we will review the current and emergent treatment modalities for AL after rectal cancer surgery.
Nasal Septal Perforation Closure by “Sandwich Grafts”: Technique, Initial Results
Authors: Bertlich Mattis , Ihler Friedrich , Bertlich Maya , Jakob Mark , Canis Martin , Haubner Frank
Published: November 2021

Nasal septal perforation closure represents a considerable surgical challenge. Many techniques rely on the implantation of foreign materials that pose a persisting threat of infection. The authors have identified a reliable technique closing septal perforations by an autologous “sandwich graft.” It is layered around a piece of auricular cartilage, covered with temporal fascia, thus emulating the physiological layers of the nasal septum. Finally, the prepared graft is then sewn into the perforation in an underlay technique and kept in place by septal splints for 4 weeks. The technique is easily feasible and strives to reconstruct the nasal as physiological as possible. The data obtained from a case series of 11 patients highlights the efficacy of the technique.
Impoliteness in women’s specialised writing in seventeenth-century English
Authors: Alonso-Almeida Francisco , José Álvarez-Gil Francisco
Published: November 2021

The notion of impoliteness may not trigger prompt associations with earlier women writing, especially non-fiction, in the pre-scientific period. Evidence drawn from seventeenth-century scientific and technical writings reveals that women make use of impoliteness strategies in order to claim and delineate their place within their community of practice. In our texts, we have detected that membership to communities of practice justifies the women’s use of positive impoliteness and sarcasm devices. Interestingly, the stereotypical female weakness represents a source for sarcastic speech, as this may offer women writers a protective shield against male critical stance. Negative impoliteness seems to be potentially related to establish power relationships and position in relation to knowledge. The idea is that scientific and technical contributions should be impartially appraised without considering the sex of the author. Impoliteness appears to be a potential means of legitimising women writers’ voices.
Metaphors of cultural diversity at UNESCO
Authors: Kornblit Irit S.
Published: November 2021

This paper analyses metaphors and analogies ofcultural diversityat UNESCO in a discursive and rhetorical-argumentative framework, to answer the following question: How do these rhetorical devices play a legitimizing role when introducing a new keyword into the public sphere? Conventional and creative metaphors are analyzed separately to examine if they represent different legitimization strategies. Conventional metaphors and analogies include variations ontreasure, heritage, andbiodiversity; creative metaphors include cultural diversity as aliving treasureand aRainbow River. The findings suggest that thewealthmetaphor fulfills an evaluative meliorative function, while theheritagemetaphor constructs a collective identity devoid of internal conflict, thereby depoliticizing the concept of cultural diversity. Thebiodiversityanalogy further depoliticizes cultural diversity via naturalization and the invocation of the authority of science. Legitimization is also achieved by invoking past discourse and shared knowledge, and by tapping into UNESCO’s “discursive memory.” In contrast, the creative metaphorsliving treasureandRainbow Riverplay a different argumentative role: they offer a rhetorical solution of coexistence to two contradicting views on culture; one as a static, closed entity to be protected from extinction, and the other as a changing, dynamic process. They do so by fusing both views, represented by different metaphors, into one creative metaphor.
Micron-scale supramolecular myosin arrays help mediate cytoskeletal assembly at mature adherens junctions
Authors: Yu-Kemp Hui-Chia , Szymanski Rachel A. , Cortes Daniel B. , Gadda Nicole C. , Lillich Madeline L. , Maddox Amy S. , Peifer Mark
Published: November 2021

Epithelial cells assemble specialized actomyosin structures at E-Cadherin–based cell–cell junctions, and the force exerted drives cell shape change during morphogenesis. The mechanisms that build this supramolecular actomyosin structure remain unclear. We used ZO-knockdown MDCK cells, which assemble a robust, polarized, and highly organized actomyosin cytoskeleton at the zonula adherens, combining genetic and pharmacologic approaches with superresolution microscopy to define molecular machines required. To our surprise, inhibiting individual actin assembly pathways (Arp2/3, formins, or Ena/VASP) did not prevent or delay assembly of this polarized actomyosin structure. Instead, as junctions matured, micron-scale supramolecular myosin arrays assembled, with aligned stacks of myosin filaments adjacent to the apical membrane, overlying disorganized actin filaments. This suggested that myosin arrays might bundle actin at mature junctions. Consistent with this idea, inhibiting ROCK or myosin ATPase disrupted myosin localization/organization and prevented actin bundling and polarization. We obtained similar results in Caco-2 cells. These results suggest a novel role for myosin self-assembly, helping drive actin organization to facilitate cell shape change.
Pairing effects in nuclear pasta phase within the relativistic Thomas–Fermi formalism
Authors: Furtado U J , Avancini S S , Marinelli J R
Published: November 2021

Pairing effects in non-uniform nuclear matter, surrounded by electrons, are studied in the protoneutron star early stage and in other conditions. The so-called nuclear pasta phases at subsaturation densities are solved in a Wigner–Seitz cell, within the Thomas–Fermi approximation. The solution of this problem is important for the understanding of the physics of a newly born neutron star after a supernova explosion. It is shown that the pasta phase is more stable than uniform nuclear matter on some conditions and the pairing force relevance is studied in the determination of these stable phases.
A novel measurement of marginal Alfvén eigenmode stability during high power auxiliary heating in JET
Authors: Tinguely R.A. , Fil N. , Puglia P.G. , Dowson S. , Porkolab M. , Guillemot V. , Podestà M. , Baruzzo M. , Dumont R. , Fasoli A. , Fitzgerald M. , Kazakov Ye.O. , Nave M.F.F. , Nocente M. , Ongena J. , Sharapov S.E. , Štancar Ž. , JET Contributors
Published: November 2021

The interaction of Alfvén eigenmodes (AEs) and energetic particles is one of many important factors determining the success of future tokamaks. In JET, eight in-vessel antennas were installed to actively probe stable AEs with frequencies ranging 25–250 kHz and toroidal mode numbers |n| < 20. During the 2019–2020 deuterium campaign, almost 7500 resonances and their frequencies f
0, net damping rates γ < 0, and toroidal mode numbers were measured in almost 800 plasma discharges. From a statistical analysis of this database, continuum and radiative damping are inferred to increase with edge safety factor, edge magnetic shear, and when including non-ideal effects. Both stable AE observations and their associated damping rates are found to decrease with |n|. Active antenna excitation is also found to be ineffective in H-mode as opposed to L-mode; this is likely due to the increased edge density gradient’s effect on accessibility and ELM-related noise’s impact on mode identification. A novel measurement is reported of a marginally stable, edge-localized ellipticity-induced AE probed by the antennas during high-power auxiliary heating (ion cyclotron resonance heating and neutral beam injection) up to 25 MW. NOVA-K kinetic-MHD simulations show good agreement with experimental measurements of f
0, γ, and n, indicating the dominance of continuum and electron Landau damping in this case. Similar experimental and computational studies are planned for the recent hydrogen and ongoing tritium campaigns, in preparation for the upcoming DT campaign.
The Classification of GIS Objects
Authors: Mironova Yu N
Published: November 2021

This paper discusses the current issues of the application of classification and data processing in geoinformation systems. The problems of classification of various objects have been studied in the works of many authors. These include a fairly wide range of problems: decryption of satellite images, pattern recognition, mathematical modeling, etc. In this paper, we study the methods and techniques for classifying objects listed in the literature, as well as preliminary data processing: feature normalization, feature weighting, aggregation, dimensionality reduction, etc. The result of finding spatial features in an attribute space is often a representation of spatial features in the form of an object-feature matrix that reflects the measurement of M features on N spatial features and contains N rows and M columns. To classify spatial objects, you must have a geographical map of these objects and an object-attribute matrix, the rows of which correspond to the spatial objects. In order to properly classify, you need to perform pre-processing of the data, including normalization, weighting, dimensionality reduction, aggregation, and identification. After preliminary data processing, the objects are classified. The paper lists and describes such classification methods as nuclear classification methods, hierarchical divisive classification methods, hierarchical agglomerative classification methods, near neighbor method, far neighbor method, centroid method, group mean method (mean link method) and other issues related to the classification of geoinformation objects.
Computer Simulation of Exchange Bias Field at the Ferromagnetic-Antiferromagnetic Boundary
Authors: Belim S V
Published: November 2021

This paper presents computer simulation results for a bilayer system with ferromagnetic and antiferromagnetic films. The dependence of the exchange bias field on the external magnetic field for this system is calculated. The Heisenberg model and the Wolf cluster algorithm are used for calculations. The reason for the appearance the bias field is the interaction between spins at the films interface. An increase the external magnetic field leads to a nonlinear increase the bias field. There are two reasons for nonlinearity. First, the external magnetic field suppresses antiferromagnetic ordering. Second, an external magnetic field-ordered ferromagnetic has an inverse effect on the antiferromagnetic film.
Designing Hydraulic Impact Devices for Low-Temperature Operation
Authors: Redelin R A , Kamanin Y N , Panichkin A V
Published: November 2021

The paper is devoted to the results of theoretical studying the hydraulic jackhammer operation under various temperature conditions and practical recommendations for their design and operation, considering the temperature factor.
Effect of Intentional Mistuning on Dynamic Characteristics of a Energy Turbomachine Bladed Disk
Authors: Repetckii O V , Nguyen V V
Published: November 2021

In this article the effect intentional mistuning of an axial turbomachine bladed disk has been analyzed in order to reduce forced response due to low-order engine excitation. The maximum value of forced response of turbomachine rotor’s blades with mistuning parameters is usually much more than the value of the tuned rotors. An increase level mistuning of this critical value actually leads to a decrease magnifications of the forced response. Thus, the actual work has been introducing some degree of intentional mistuning in the design to achieve these purposes. The effectiveness of intentional mistuning has been researched at the design stage of the bladed disk in the energy turbomachines, which is introduced into the rotor’s design by changing the nominal mass of the blades in harmonic models.
Application of a Mobile Robot for Picking Berries Under Qualitative Uncertainty of Conditions
Authors: Kafiev I , Romanov P , Romanova I
Published: November 2021

Over the last decade, the development of computer technology has progressed significantly, which allowed to automate many production processes through the use of intelligent control systems. The possibility of creating modern control systems that allow solving complex multi-factor tasks in conditions of uncertainty has significantly expanded the scope of application of robotics. The article considers an approach to solving one of the tasks of controlling an intelligent mobile robot for agricultural purposes – selecting the order of application of the robot for picking berries. The procedure for decision-making by an intelligent control system for a mobile robot under the qualitative uncertainty of berry picking conditions has been developed. This procedure can be implemented by developing software. The approach proposed by the authors to solving such problems can be used not only for control the intelligent mobile robot for picking berries, but also for other purposes. The article presents the results of applying the developed method for solving the task of control the agricultural mobile robot for picking strawberry in the climatic conditions of Central Russia.
Dynamic Measurements of Tank Wall Deformations as a New Method for Assessing its Technical Condition
Authors: Gaysin E Sh , Valeev A R , Tashbulatov R R
Published: November 2021

The paper proposes a new approach to assessing the residual resource of the wall of a vertical steel tank by the criterion of low-cycle loading, taking into account its actual deformations. The method is based on the principle of measuring the difference in the power of the luminous flux at the ends of the light tube (light guide) when it is bent. An experiment was carried out using an optical pair (LED and photodiode) and an optical fiber. For this purpose, templates with known radii of curvature were prepared, a prototype of an Arduino-based device was developed and an optical fiber was manufactured, which was subsequently fixed on the wall of a two-hundred-liter metal barrel. As a result of the experiments, a formula was obtained for determining the curvature of the wall depending on the readings of the sensor. The sensitivity of the proposed method is estimated. An algorithm for determining the number of cycles before the formation of fatigue cracks is proposed, taking into account the actual values of the wall deflection.
Algorithm Analysis and Assessment of the Information Objects in Adaptive Systems
Authors: Obukhov A , Volkov A
Published: November 2021

Analysis and assessment of the state of information objects is an urgent task in adaptive systems. Information about the current state of the system, its constituent components, the object of observation can be used in the decision-making process or in the implementation of control algorithms. However, an information object can have a complex structure or be characterized by many features, among which it is difficult to distinguish the main components. Therefore, an algorithm for analyzing and assessing the state of information objects is proposed, based on obtaining the compressed state of objects using neural networks. The resulting compressed state sufficiently characterizes the original object, but has a lower dimension. This can be used to speed up the analysis and assessment process and improve its accuracy in adaptive systems.
Algorithms for Controlling the Hardware and Software Platform for Moving in Virtual Reality
Authors: Dedov D , Vostrikova V , Surkova E
Published: November 2021

Comprehensive training of specialists in machine-building, chemical and mining industries requires the use of modern means of education. The use of software and hardware platforms based on virtual reality technologies and controlled treadmills allows for a high level of immersion in the learning process and the development of the necessary practical skills. However, the existing control algorithms for treadmills have a number of disadvantages: the effect of lag, low adaptability to human actions. The paper discusses several approaches to organizing the management of a software and hardware platform to improve the quality of movement in virtual reality. Linear and nonlinear algorithms have been developed and have been tested, and the quality of human movement in virtual reality has been made. The nonlinear modified algorithm has allowed to obtain the best results and to reduce the amplitude of oscillations relative to the initial position.
Integration of Simulation Systems into the Software and Hardware Platform of Virtual Training Complexes
Authors: Dedov D , Nazarova A , Teselkin D
Published: November 2021

The implementation of training complexes based on virtual reality for the training of specialists in machine-building, chemical, mining and other industries is associated with the need to solve a number of tasks. These include simulating various physical processes (temperature, humidity, and air pressure), loads (speed of movement and angle of inclination of the surface), and other external factors that cannot be reliably simulated in virtual reality. Therefore, an urgent task is to integrate various simulation systems into the software and hardware platform of virtual training complexes, which will provide a realistic immersion in the subject area due to virtual reality, as well as simulate the necessary external influences on the student. The paper considers this process by the example of integration of a simulation system of physical loads into virtual training complexes. The basis of the simulation system under consideration is a controlled treadmill. The use of treadmills allows students to develop muscle memory, perform physical training and increase the degree of immersion in virtual reality, which positively affects the effectiveness of their training. However, their integration requires the solution of a number of practical tasks for the transfer of information between the individual subsystems of the virtual training complex. The paper considers algorithms and software for solving these problems. The described approaches can be used to integrate various simulation systems into the software and hardware platform of virtual training complexes for the organization of comprehensive training of specialists.
Analysis and Modeling of the Negative Impact of Virtual Reality
Authors: Vehteva N , Nazarova A , Surkova E
Published: November 2021

During the use of virtual training complexes for the training of specialists in the engineering, chemical, mining industries, in the course of numerous studies, the negative impact of virtual reality on the physical state of a person is noted. These include various types of motion sickness, dizziness, nausea, disorientation in space. Therefore, an actual task is researching of causes and the degree of influence of negative factors using virtual reality technologies. To track negative effects, an algorithm for analyzing user’s state has been developed, which allows collect data of person’s state during the interacting with virtual reality. The algorithm allows fixing quantitative and qualitative metrics. Calculation of metrics is formalized in a mathematical model of process of the virtual reality influence on a person. Algorithm and model are tested on example of an exercise on moving simple virtual objects, data is obtained on a focus group of young specialists. Dynamics of changing quantitative and qualitative metrics is evaluated; it received an idea of degree of influence of negative effects on studying process.
Mathematical Modeling of a Virtual Platform for Training Specialists in the Oil and Gas Industry
Authors: Chebotov N , Davydova D , Patutin K , Prokudina N
Published: November 2021

A relevant task in the organization of comprehensive training of specialists in various fields is the development of the necessary theoretical and practical competencies. In the conditions of pandemic restrictions and the need to conduct classes in a distance mode, there is a need to develop new educational resources and means of representing knowledge, functioning on the basis of modern information technologies. One of the promising approaches is the transfer of laboratory and practical exercises to a virtual platform that allows you to master the necessary practical competencies on a computer. However, the functioning and visualization of physical or chemical processes in such virtual platforms must correspond to real processes. The article discusses the mathematical modeling of a virtual platform for training specialists in the oil and gas industry. An approach to the construction of a mathematical model based on the collected experimental data, the study of the laws of equilibrium of liquid and gas, and hydrostatic equations is considered. On the basis of the obtained model, an algorithm for the functioning of a virtual stand on the Unity platform is built. The presented approach can be used in the implementation of various virtual platforms for organizing the learning process in a distance form.
Monitoring and Controlling Condition of Complex Multiparametric Object
Authors: Fedorov V Kh , Balenko E G , Ivanov S A , Vershennik E V
Published: November 2021

Technology is advancing ever faster in all areas of human activity, making the objects around us ever more complicated. Notably, complex objects have multiple parameters that define their condition, whether normal, near-critical, critical, over-critical, etc. If critical infrastructures are in critical condition, their collapse jeopardizes not only the infrastructures, but also their environment. This is why timely maintenance and control of condition is imperative for complex objects. This paper dwells upon a method for monitoring and controlling the condition of a complex multiparametric object; the method uses a minimum number of monitored parameters to retain full data on the condition of a complex object, to optimize the periodicity of taking readings depending on the functional phase of the object, and to determine how object parameters relate to each other and how they affect the quality of its functioning; such minimization reduces computational complexity and the bandwidth requirement. Russian Invention Patents granted to the authors certify the novelty and practical significance of the proposed solution.
Modification Hydrodynamic Properties of Narrowing Down Devices of Flow Sensors from Action of an Abrasive Wear
Authors: Kharitonov A O , Bysigina E B , Nikitina O A
Published: November 2021

In operation the outcomes of study influencing an abrasive wear of working surfaces of a cylindrical nozzle on operation of a flow sensor of variable pressure differential are introduced. The outcomes are obtained by a numerical modelling of current of fluid through a nozzle. For a nozzle the internal cylindrical surface is resized up to a taper and circularization on radius a crimp on an input. Simulation executed by a finite element method with usage of the program Ansys 5.5ED. Budgeting of numerical experiment and treating of outcomes have fulfilled with applying of the program Stastistica 6.1.The quantitative estimation of influencing an abrasive wear on variation coefficient of the outflow of flow sensors is obtained.
Laws of Motion of the Lower Extremities and Structural-parametric Synthesis of Electro-hydraulic Executive Modules of the Active Exoskeleton According to the Criterion of Energy Suffiency
Authors: Zuev Yu Yu , Saypulaev M R , Doni V
Published: November 2021

The object of the research is the electro-hydraulic executive modules (drives) of the exoskeleton of the lower extremities with a rigid structure of the power frame. The problem of schematic and parametric execution of modules located in the linkage joints of the exoskeleton which is used for verticalization of patients is considered. The aim of the study is to estimates energy consumption, sensitivity, establish a rational structure and parameters of modules that provide programmed movement according to the criterion of energy sufficiency. The laws of motion and diagrams of loads required for lifting a patient from a sitting position are presented.
Application of Broadband Signals to Increase Interference Immunity in Channels with Inter-Symbol Interference
Authors: Fedorov V K , Balenko E G , Dvornikov S V , Lauta O S
Published: November 2021

Proposals for improving the noise immunity of receiving phase-shift keying signals in the conditions of inter-symbol interference caused by fading in the channel are presented. The use of Barker sequences for the expansion of modulating information pulses has been substantiated. The results of evaluating the noise immunity of Rice fading channels at various ratios of the effective voltages of the regular and diffuse signal components are presented. Proposals for the practical application of the results obtained are formulated.
Selection of Effective Thermal Insulation Materials for a Liquefied Natural Gas Tanks
Authors: Medvedeva O N , Perevalov S D
Published: November 2021

The object of the research is an isothermal tank container for storage and transportation of liquefied natural gases, which requires special operating conditions and is related to a technological facility of increased danger. The purpose of the study is to substantiate the type and thickness of the insulating material to reduce the losses of liquefied natural gas during storage and transportation. Based on the results of the analysis, effective insulation materials were selected for use in cryogenic tanks for isothermal storage of LNG, the optimal thickness of the insulation material was determined, which provides the required level of losses for gas evaporation.
Methodology for Designing Hardware for Measuring Parameters of a Digital Signal
Authors: Pirogov A A , Pirogova Yu A , Bashkirov A V , Glotov V V , Gvozdenko S N
Published: November 2021

In the production of various devices, various problems can arise, leading to the appearance of defects, both explicit and latent. This may be due to both poor quality materials and imperfect technology. To identify defects, devices are tested. If the device uses a digital signal transmission at high frequencies, it is usually considered sufficient to check the functioning of the individual components using technological programs. But at high transmission frequencies, or due to defects, the digital signal is distorted, and in devices where there is no error control, violations of the signal integrity during transmission can lead to failures and failures. Moreover, under normal conditions, the signal can meet the requirements, and in difficult conditions, go beyond the permissible limits. If an individual instance of a device can be susceptible to such failures, this can be identified in more detail by examining the signals flowing through its circuits. The most obvious way requires an oscilloscope, on the screen of which a person looks at the parameters of such a signal, time and amplitude characteristics. This is a very slow operation, so optimization might be the next step. For example, the use of flying probes, or probes with commutation, recording and automatic comparison of oscillograms with the exemplary one. In any case, these tests require equipment operating at frequencies much higher than the circuit itself, which means that at high baud rates, such equipment starts to be expensive.
On the Problem of Choosing Optimal Methods for Approximating Functions
Authors: Bordanov I A , Zhiganov S N , Danilin S N
Published: November 2021

The materials of the article relate to the field of optimization of control systems and signal processing when preparing models for technical implementation. The informational level of structural and functional decomposition of models of approximators of square root functions is considered. The article investigates two classes of computational methods: sequential - polynomials of the best approximation and parallel - multilayer feedforward neural networks. For each of the classes, using particular examples, the approximation error was calculated according to the criteria of the maximum absolute error and the area of the error function, as well as the computational costs as the sum of the number of mathematical operations and queries in the memory of the calculator.
Flue Gas Removal Systems Are a Key Issue in the Application of Condensing Boilers
Authors: Khavanov P , Chulenyov A
Published: November 2021

This article is devoted to the most pressing issue of the use of condensing boilers in Russia for autonomous heat supply systems - the organization of smoke removal. If we compare a standard gas boiler with its condensing counterpart, then we can come to the conclusion that their differences lie not only in some innovations, but in radically different principles of operation. Yes, in both cases, the heating of the coolant occurs due to the combustion of the gas, but in the condensing boiler, the heating of the coolant is additionally performed with the help of exhaust gases. Moreover, the smoke removal system in this case produces the primary heating of the liquid - the exhaust gases, which contain a large amount of water vapor, first heat the coolant, and only then directly the gas heats it up to the specified temperature. It is thanks to all this that fuel savings occur - the efficiency of condensing boilers is 15-20% higher compared to standard units of this type. The set of domestic directives and regulations on autonomous heat supply in individual issues, focusing on foreign developments, at the same time has significant features in the requirements for the design and operating conditions of combustion products removal systems, especially for condensing boilers.
Rational Heat Schemes Using Condensing Boilers in Local Heat Supply Systems
Authors: Khavanov P , Chulenyov A
Published: November 2021

Within the framework of this publication, thermal diagrams of autonomous heat supply systems using condensing heat generators are considered. The insignificant Russian experience of using small condensation boilers in residential construction shows that it is often used to simply replace traditional equipment with condensation technology in existing (or traditionally used) heat schemes, for example, with protection of the boiler from “cold return” by recirculating heat carrier or installing a hydraulic regulator. The consequence of this is almost completely lost the effect of the use of condensing boilers. At the same time, even using the heating temperature schedule of quality regulation 80-60°C and applying water heating to the DHW target up to 45°C you can achieve the effect of the boiler operation in the condensation mode, depending on the construction area, up to 75% of the total working time per year, generating about 70% of thermal energy in the annual cycle. However, it must be borne in mind that the efficiency of the condensing boiler is determined by the part of the latent heat of water vapor in the combustion products, which can be obtained with partial condensation. If this part is small, for example, when cooling the flue gases to 50-45°C (on gas), then the efficiency gain is only 1-3%.
Modeling the Dependence of the Specific Impulse on the Temperature of the Heater of an Electrothermal Micro-Motor Based on the Results of Its Tests
Authors: Taneeva A S , Lukyanchik V V , Khnyryova E S
Published: November 2021

The paper investigates the dependence of the specific impulse on the temperature of the heater of an electrothermal micro-motor in order to analyze the possibility of its use as a part of a motion control system for a small technological spacecraft. The possibility of using an electrothermal micro-motor for unloading the angular momentum of flywheel motors is considered.
Influence of Nonlinear Processes in Soils on the Impulse Resistance of Grounding Electrodes
Authors: Ivonin V V
Published: November 2021

The article presents the results of laboratory studies of nonlinear processes during the flow of pulsed currents into moistened soil from electrodes modelling grounding devices of electric power facilities. A methodology for studying the pulse parameters of grounding devices has been developed and a laboratory stand and a generator measuring system have been developed on which these investigation were performed. The experiments were carried out on three types of electrodes at voltages of 20 - 50 kV and pulse durations from units to hundreds of microseconds. The article presents the combined results of optical and oscillographic studies. It is shown that the cause of the formation of spark channels during the nonlinear spreading of the pulsed current in the soil, when there is a sharp decrease in the grounding resistance, is the ionization-overheating instability that occurs when the current density on the electrode is greater than the critical one. The development of instability leads to an inhomogeneous current distribution and the appearance of spark channels. On the basis of experimental data, the current-voltage characteristics of the electrodes are obtained.
Nonlinear Control System for Non-Affine Undefined Plants with Output Delays
Authors: Eremin E L , Nikiforova L V , Shelenok E A
Published: November 2021

The article deals with the problem of synthesis of the control algorithms for combined nonlinear control system for one class of single-channel non-affine priory uncertain plants with state delay in the presence of permanent bounded external noises and at measuring only the plant’s output signal. As methods for solving this problem V. M. Popov’s hyperstability criterion and the conditions of L-dissipativity are used. With the help of simulation the operation quality of the obtained system at different values of the plant relative order and its parameters is shown. The results obtained in article may be useful for construction the control systems for different dynamic plants which contains input nonlinearities and state delays.
Development and Research of Motion Control Algorithms of Elastic Electromechanical Systems Taking into Account the Damping Properties of the Electric Drive
Authors: Iov I A , Kuznetsov N K , Dolgih E S
Published: November 2021

The paper presents the results of studies of the effect of the counter-electromotive force (CEMF) of the dc machine on the parameters of the elastic oscillation control system of a two-mass electromechanical system, synthesized based on of solving the inverse problems of dynamic in accord with prescribed nature of controlled motion. It is shown by the method of numerical simulation that taking into account the CEMF leads to an increase of the damping properties of the electromechanical system and an increase of the gains of the feedbacks on the force in the cable. A method for the selection of these gains is proposed, based on their comparison with the gains obtained in an electromechanical system without taking into account the CEMF and an approximate assessment of its effect on the nature of the transient processes.
Analysis of the Downhole Measurement System’s Pressure and Temperature Measuring Channel Calibration Errors
Authors: Ishinbaev N A , Krasnov A N , Prakhova M Yu , Novikova Yu V
Published: November 2021

Various measurements in wells are quite challenging due to the specific measurement conditions. There are some additional requirements for measurement systems, in particular, space restrictions. Therefore, measuring several parameters with a single sensor is rather important. The paper discusses a measurement system that allows measuring temperature and pressure with a single sensor – an SOS-based strain gauge pressure transducer with a bridge or half-bridge circuit. In this case, pressure and temperature measuring channels are calibrated individually, which creates another error component. The numerical simulation of calibration described herein shows that regardless of the sensor circuit, the voltage uncertainty band of both measuring channels is characterized by a reduced error of 0.03 % with a confidence probability P = 0.9.