bluuebunny/crossref_metadata_2025 huggingface dataset:
Chaos in the Bose–Hubbard model and random two-body Hamiltonians
Authors: Pausch Lukas , Carnio Edoardo G , Buchleitner Andreas , Rodríguez Alberto
Published: November 2021

We investigate the chaotic phase of the Bose–Hubbard model (Pausch et al 2021 Phys. Rev. Lett.
126 150601) in relation to the bosonic embedded random matrix ensemble, which mirrors the dominant few-body nature of many-particle interactions, and hence the Fock space sparsity of quantum many-body systems. The energy dependence of the chaotic regime is well described by the bosonic embedded ensemble, which also reproduces the Bose–Hubbard chaotic eigenvector features, quantified by the expectation value and eigenstate-to-eigenstate fluctuations of fractal dimensions. Despite this agreement, in terms of the fractal dimension distribution, these two models depart from each other and from the Gaussian orthogonal ensemble as Hilbert space grows. These results provide further evidence of a way to discriminate among different many-body Hamiltonians in the chaotic regime.
Multiple-relaxation-time lattice Boltzmann simulation of free convection and irreversibility of nanofluid with variable thermophysical properties
Authors: Islam Mashnoon , Abdul Hai Salma , Nag Preetom , Molla Md Mamun
Published: November 2021

This numerical study demonstrates heat transfer and irreversibility or entropy generation of non-Newtonian power-law Al2O3-H2O (aluminum oxide-water) nanofluids in a square enclosure using multiple-relaxation-time lattice Boltzmann method accelerated by graphics processing unit computing. In this investigation, the effective thermal conductivity and viscosity are variables, and they depend on the fluid temperature and rate of strain, respectively. The enclosure’s left and right walls are uniformly heated with different temperatures, and the upper and lower walls are thermally adiabatic. There is no valid study and results on non-Newtonian fluid using multiple-relaxation-time lattice Boltzmann method for this configuration and hence the novelty of the present results have been ensured. This paper has formulated and appropriately validated the Newtonian and non-Newtonian natural convection problem with the available numerical results. This study includes a set of comprehensive simulations, showing the effects of these fluids’ natural convection by varying three key parameters: the Rayleigh number, the volume fraction of nanoparticles, and the power-law index on the streamlines, isotherms, local and average Nusselt number as well as the local and total entropy generation. The results show that increasing the volume fraction of the nanoparticles from 0% to 2%, the average rate of heat transfer and the total entropy generation increase 6.5% and 7.4%, respectively, while the Rayleigh number, Ra = 105 and the power-law index n = 0.6.
Modeling of thermal studies on melt quenched Ge18Bi4Se78 chalcogenide
Authors: Hakeem A M Abdel , Abd El-Raheem M M , Wakkad M M , Mohamed H F , Ali H M , Mohamed SK , Diab A K
Published: November 2021

The crystallization characteristics for Ge18Bi4Se78 glass are studied in this work by means of differential thermal analysis (DTA) under non-isothermal conditions. One stage endothermic glass transition and one exothermic crystallization are observed in the DTA curves. The results of topological constraints for Ge18Bi4Se78 glass show that the calculated value of glass transition temperature (Tg) is very close to that of the experimental results. The as-prepared, as well as the annealed samples, are examined using x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX), scan electron microscope (SEM) techniques. Avrami’s exponent (n) found to have an average value of 1.61

±
0.2

reveals a mixture of one dimensional and surface nucleation stages of growth. Many models are used to estimate the activation energies for glass transition (Eg) and crystallization (Ec). The crystallization process was found to be described by the Sestak- Berggren SB(M, N) model.
Measuring Microlensing Parallax via Simultaneous Observations from Chinese Space Station Telescope and Roman Telescope
Authors: Yan Shi , Zhu Wei
Published: November 2021

Simultaneous observations from two spatially well-separated telescopes can lead to measurements of the microlensing parallax parameter, an important quantity toward the determinations of the lens mass. The separation between Earth and Sun–Earth L2 point, ∼0.01 au, is ideal for parallax measurements of short and ultra-short (∼1 hr to 10 days) microlensing events, which are candidates of free-floating planet (FFP) events. In this work, we study the potential of doing so in the context of two proposed space-based missions, the Chinese Space Station Telescope (CSST) in a low-Earth orbit (LEO) and the Nancy Grace Roman Space Telescope (Roman) at L2. We show that joint observations of the two can directly measure the microlensing parallax of nearly all FFP events with timescales t
E ≲ 10 days as well as planetary (and stellar binary) events that show caustic crossing features. The potential of using CSST alone in measuring microlensing parallax is also discussed.
Progress of HL-2A experiments and HL-2M program
Authors: Duan X.R. , Xu M. , Zhong W.L. , Liu Y. , Song X.M. , Liu D.Q. , Wang Y.Q. , Lu B. , Shi Z.B. , Zheng G.Y. , Liu Yong , Yang Q.W. , Mao W.C. , Li Q. , Cai L.J. , Ji X.Q. , Liu X.L. , Li L.C. , Li B. , Dong J.Q. , Ding X.T. , Yan L.W. , Artaud J.F. , Bai X.Y. , Cao J.Y. , Cao Z. , Chen L. , Chen W. , Delpech L. , Du H.L. , Ekedahl A. , Gao Z. , Garcia J. , Han M.K. , Hao G.Z. , He H.M. , Hoang G.T. , Huang M. , Isobe M. , Jiang M. , Liang A.S. , Liu Y.Q. , Li D. , Li H.J. , Li J.Q. , Li J.X. , Li Qing , Li Yongge , Long T. , Mazon D. , Mckee G.R. , Qiu Z.Y. , Peng J.F. , Peysson Y. , Rao J. , Song X. , Sun T.F. , Wang Z.X. , Wei H.L. , Wen J. , Wu N. , Xu Y.H. , Xiao G.L. , Xiao X.P. , Xue L. , Yan Z. , Yang Z.Y. , Yu D.L. , Yu L.M. , Yu Y. , Zang L.G. , Zhang J.H. , Zhang N. , Zhang Y.P. , Zonca F. , Zou X.L.
Published: November 2021

Since the last IAEA Fusion Energy Conference in 2018, significant progress of the experimental program of HL-2A has been achieved on developing advanced plasma physics, edge localized mode (ELM) control physics and technology. Optimization of plasma confinement has been performed. In particular, high-β
N H-mode plasmas exhibiting an internal transport barrier have been obtained (normalized plasma pressure β
N reached up to 3). Injection of impurity improved the plasma confinement. ELM control using resonance magnetic perturbation or impurity injection has been achieved in a wide parameter regime, including types I and III. In addition, impurity seeding with supersonic molecular beam injection or laser blow-off techniques has been successfully applied to actively control the plasma confinement and instabilities, as well as plasma disruption with the aid of disruption prediction. Disruption prediction algorithms based on deep learning are developed. A prediction accuracy of 96.8% can be reached by assembling a convolutional neural network. Furthermore, transport resulting from a wide variety of phenomena such as energetic particles and magnetic islands has been investigated. In parallel with the HL-2A experiments, the HL-2M mega-ampere class tokamak was commissioned in 2020 with its first plasma. Key features and capabilities of HL-2M are briefly presented.
Simulation of Crane Trolley Motion Control to Reduce Load Sway
Authors: Reutov A A
Published: November 2021

the work aims to develop a method for controlling a crane trolley, providing a decrease in the swinging of the load on the rope at a given positioning accuracy and minimum time for moving the load.

Computer simulation of the trolley controlled movement with a load on a rope was carried out within the "Universal Mechanism" software.

The 2D computer model includes a trolley with a pulley, a rope with a hook, and a load. T-force represents the wind force effect.

The control system (CS) contains three blocks that ensure the movement of the trolley with limited speed and acceleration, the positioning accuracy of the trolley, limiting the deviation and acceleration of a load. List of requirements for the crane CS comprises six issues.

The simulation results illustrate the satisfactory performance of the proposed method. The swing angle and trolley positioning accuracy can be controlled within the acceptable range and the external wind disturbance on the load can be successfully suppressed. The optimal parameters of the proportional-differential corrective control, which ensure the minimum travel time of the trolley with limited oscillation of the load, have been determined. The optimal values of the control parameters depend on the inertial characteristics of the load. The maximum permissible values of speed, acceleration, and positioning errors of the trolley limit from above the optimal values of the control parameters.
Active Patch Antenna for Wi-Fi 5, 6 and Wi-Fi 6E Applications
Authors: Ischenko E A , Pasternak Yu G , Pendyurin V A , Fedorov S M
Published: November 2021

The article discusses a planar patch antenna with a metamaterial integrated into the structure, which allows the antenna to function in the upper Wi-Fi 5, 6 frequency range and the Wi-Fi 6E range. For the study, we built graphs of S-parameters, radiation patterns; on the basis of the resulting structure, we formed a MIMO antenna array for which we determined the main characteristics - the envelope correlation coefficient and the multiplexing efficiency
Determination of the Design Characteristics of Heat Exchange Equipment for Heating Network Water of a Cogeneration Gas Turbine Unit with a Change in the Heat Load of Consumers in Regions with Different Climatic Conditions
Authors: Kler A M , Stepanova E L , Zharkov P V
Published: November 2021

Optimization studies of the dependence of fuel consumption on changes in the heat load of consumers in regions with different climatic conditions and taking into account the determination of the design characteristics of the equipment for heating network water of a cogeneration GTU were carried out. The GTU has two fuel combustion chambers, a waste-heat boiler and a contact heat exchanger for heating of feeding network water. Schematic-parametric optimization studies were carried out on the design mathematical model of the GTU. The analysis of the data of the circuit-parametric optimization made it possible to conclude that for the operating modes of the gas turbine plant with a higher thermal load, it is advantageous to slightly increase the heating surface area of the heater of feeding network water, the cost of materials for the manufacture of which is lower than for the waste heat boiler. This technical solution provided a relatively low increase in specific capital investments with full provision of consumers with electric and thermal energy. The data obtained in this work can be used to select the optimal technical solutions that ensure competitiveness in the operation of a cogeneration gas turbine unit in regions with different climatic characteristics.
Analysis and Classification of Low Head Hydro Power Based on Advanced Morphological Approach
Authors: Rakov D L
Published: November 2021

The paper discusses hydrokinetic systems low head hydro power as an element renewable resource. In the paper a review of the existing and upcoming orthogonal and axial turbines schemes is outlined. Based on a morphological approach comprehensive survey of various schemes and qualitative comparison, is presented. The proposed engineering solutions reduce the structure weight and the processability increases. These factors lead to a decrease in the cost. The engineering solutions under consideration are designed to operate in low-pressure flows, regardless of their direction. Thanks to these features, the scope of their use expands. They can be used both in high tide and in the use of the sea currents kinetic energy.
Recovering Information from Wireless Sensors in Hardware and Software Platforms
Authors: Zverev M , Vostrikova V , Teselkin D
Published: November 2021

The work considers the task of information processing in a subsystem of the hardware-software platform of the simulator complex - a mobile system of simulating isolation breathing apparatuses. The problem of predicting values when data packets are lost during their wireless transmission has been revealed. To solve the problem, an algorithm for data processing based on neural network technology has been developed, which allows reducing the number of data packet losses by predicting the lost values. The experimental studies confirmed the adequacy and effectiveness of the proposed algorithm. The use of neural networks in solving the problems of information processing has improved the accuracy of this process.
New Method for Adjusting Coefficients PI Conroller in the Load Control System of the Shearer
Authors: Shprekher D M , Zelenkov A V
Published: November 2021

The paper proposes a method using extrapolator models to predict the parameters of the PI controller. With a sudden change in the resistance of coal to cutting, in particular, at different levels of steps and their combinations, the speed of the cutting current controller and current steps also differ, the quieting time of the transient process also occurs in different times. To implement the adjustment of the coefficients of the PI controller, a feed forward artificial neural network is used, which acts as an operational means of recognizing a multidimensional response curve in the control loop. Neural networks of two architectures were used: with a scalar and vector output function. The recognition result is the estimated level of the step in the coal’s resistance to cutting based on the initial counts of the multidimensional response curve at the specified coefficients of the PI controller. The approach proposed in the article can be used in solving other applied problems in which the control object is nonlinear and the control algorithm needs to adapt to the changing unobservable effect on the object.
Cyberspace: Key Properties and Traits
Authors: Fedorov V Kh , Balenko E G , Starodubtsev Yu I , Zakalkin P V
Published: November 2021

Backbone telecom networks have become one, which created an artificially global space known as cyberspace. The very emergence of such a complex space calls for detailed investigation and making a thesaurus. This paper is an attempt to create a terminology base applicable to the concept.
Development of a Method for Building a Trusted Environment by Using Hidden Software Agent Steganography
Authors: Fedorov V Kh , Balenko E G , Shterenberg S I , Krasov A V
Published: November 2021

For more than a decade, the scientific community has been developing various models of insider actions in the trusted-zone information system and methods for identifying such. All those years, they have been facing the challenge of finding quality data samples for analysis and testing, and it is the availability of reliable data on the attack that is crucial for any research or detection of attempts to steal or compromise legal software. Unfortunately, collection of such samples remains nearly impossible despite some attempts to do so. Any data on incidents is either incomplete or inaccurate, or is not available at all.

Software developers also face lack of resources, including time. Developers do not have enough time, funding, material resources, or qualifications to make a sturdy security system, which is why they need to use third-party automations that dock a security module to the compiled program. The strength of this approach is that such a system can be embedded in any software, whereas the weakness is that the method is "one-size-fits-all". Standard protections span across multiple programs, which results in a higher chance of being hacked.
The Influence of a 3D Model of a Radio Electronic Component on Thermal Simulation
Authors: Bashkirov A V , Glotov V V , Bobylkin I S , Balashov Yu S , Kushnarev A S
Published: November 2021

Very often, when designing and developing radio electronic devices, engineers are regularly faced with the need to solve various kinds of problems to ensure the operation of a product under the required mechanical loads or thermal conditions during operation. One of the main issues that arise when conducting thermal modeling of radio electronics is the correct assessment of the results. There are a number of electronic components that need to be cooled, mainly through a printed circuit board: power supply transistors, power diodes, microcircuits, etc. For such elements, 90% (or more) of the heat flux from the component is diverted through the printed circuit board, and then to the radiator. Therefore, when carrying out the simulation, it is necessary to have previously obtained reliable temperature results on the power elements. The use of a detailed 3D model for modeling is most often unjustified and can introduce certain errors in the calculations. This article compares different 3D transistor models and the effect of detailing on the modeling process in CAD SolidWorks.
Possibility of Using Alternative Electric Power Industry for Power Supply of Autonomous Infocommunication Complexes
Authors: Vegera D V , Zhiba G V , Pisarenko V P
Published: November 2021

This article analyzes the possibility of using non-traditional – solar and wind power engineering to ensure the autonomous functioning of infocommunication facilities operating without the constant presence of personnel. The technical characteristics of the main functional elements and the conditions for their interaction in the power supply system of the communication object are given. The main results obtained during the operation of the experimental scheme of autonomous power supply are shown.
Methods and Algorithms of Turbojet Engines Thrust Parameters Control Unerroric
Authors: Burova A Yu
Published: November 2021

This report shows a real way for solving the problem of turbojet engine thrust parameters control in flight. The purpose of the research is the formalization of the digital methods and its algorithms for turbojet engines thrust parameters control unerroric. The methods of deductive digital signal processing and combined method of system analysis and approximate synthesis are used for such research. It is described the digital algorithms of unerroric methods wich are based on rotor speed control for turbojet engines of twin-engine airliner by its power plant control system. There are given the calculation formulas for those algorithms.
Information-Measuring System to Measure Fluid and Granular Media Flow Velocities in Pipelines
Authors: Akhobadze G
Published: November 2021

All articles must contain an abstract. The abstract text should be formatted using 10 point Times or Times New Roman and indented 25 mm from the left margin. Leave 10 mm space after the abstract before you begin the main text of your article, starting on the same page as the abstract. The abstract should give readers concise information about the content of the article and indicate the main results obtained and conclusions drawn. The abstract is not part of the text and should be complete in itself; no table numbers, figure numbers, references or displayed mathematical expressions should be included. It should be suitable for direct inclusion in abstracting services and should not normally exceed 200 words in a single paragraph. Since contemporary information-retrieval systems rely heavily on the content of titles and abstracts to identify relevant articles in literature searches, great care should be taken in constructing both
Evaluation of Graphical User Interfaces by the Search Time for Information Objects
Authors: Sineshchuk Y , Terekhin S , Saenko I , Kotenko I
Published: November 2021

The paper discusses the problem of poor quality of graphical user interfaces used for various software products. The provided analysis shows that modern software has poor-quality interfaces, and there are no flexible programs for evaluating such interfaces. The paper highlights and describes the characteristics that are used to assess the quality of interfaces, such as operator speed, error rates, skill retention, and subjective satisfaction. A formalized approach to assess the speed of searching for information and functional objects is proposed. It is based on such characteristics as the time of fixation of the gaze, movement of the eye, the volume of a person’s operative memory, the zone of clear vision, the path of the user’s gaze information search. An algorithm for estimating the speed of searching for information and functional elements is proposed. This algorithm can be implemented and used for further design of a software application based on it. The algorithm makes it possible to automatically evaluate both a particular interface and to compare the interfaces of different programs.
Study of the Possibility of Creating Autonomous Low-Power Thermal Power Plants Using Alternative Energy Sources
Authors: Shubina A S , Marin G E , Akhmetshin A R
Published: November 2021

The areas of use of low - capacity power plants are very wide: industrial enterprises, medical institutions, residential cottages, business centers and other objects of large cities; main gas pipelines, gas distribution stations, oil pipelines that need energy supply for normal operation; enterprises for processing household waste; developing areas of the country where there are currently no energy sources and power lines; energy-deficient areas of the Far North, Far East, and some Non-Chernozem regions; small towns, cottage settlements and villages, in many of them the issue of centralized heat supply; large livestock farms, enterprises for processing agricultural products, enterprises of the logging industry, etc.

In this study, an important problem for oil fields is considered - utilization of associated petroleum gas. Low-power power plants are considered as a combustion engine. It is important to note that high-quality fuel treatment is required for internal combustion engines or gas turbines. The proposed scheme of associated gas utilization based on a small power plant is not fuel-intensive. Studies of compressor and turbine matching are presented, resulting in an optimal range of operating areas. These results allow us to determine the limitations for the operation of the power plant.
Improving the System Efficiency of CHP in the Context of Increasing Requirements for the Maneuverability and Environmental Friendliness of Power Plants
Authors: Beloborodov S S , Dudolin A A , Lisin E M , Kindra V O
Published: November 2021

New trends in the fight against climate change on the planet, suggesting a reduction in greenhouse gas emissions, are influencing the formation of a new structure of the electric power system. As the experience of the European Union shows, the active development of renewable energy sources affects the electrical modes of operation of power plants and in the future can lead to a decrease in electricity production in a highly efficient combined generation mode at CHPPs. Thus, there is an acute issue of finding a place for a CHP plant in the emerging power systems, in which generating equipment will be especially in demand, effectively operating in half-peak and peak modes to cover the daily load unevenness. The development and commissioning of a highly maneuverable GTU-CHPP, capable of operating in a combined generation mode with daily starts / stops, can significantly increase the efficiency of electricity generation in the peak part of the daily load schedule. The system effect of the commisionning of 10 GW of highly maneuverable GtU-CHPPs within the UES of Russia will reduce the consumption of fossil fuel by 19.6 million tce per year and CO2 and NOx emissions by 55 million tons and 24.7 thousand tons per year, respectively.
Modelling the Temperature State of Bodies with Internal Heat Sources
Authors: Eremin A V , Gubareva K V , Popov A I
Published: November 2021

This article presents the results of the development of a numerical - analytical method for solving the problem of thermal conductivity in a plate fuel element. An unsteady temperature field inside a fuel element is investigated for a given spatial distribution of heat sources. The heat release rate is given by the quadratic function of the coordinate. Modeling the temperature state of bodies with internal heat sources allows you to study the operation of equipment in transient modes, control heating/cooling modes of elements, determine temperature stresses, etc. It is shown in the work that regardless of the power of internal sources of heat, the temperature state is stabilized at a temperature level that depends on the Pomerantsev number.
Flicker in the Networks with Distributed Generation Plants and Its Removal Using Group Prognostic Controller
Authors: Bulatov Yu N , Kryukov A V , Suslov K V
Published: November 2021

The use of distributed generation (DG) plants in electrical energy system (EES) produces unambiguous effect on power quality. The presence of DG plants allows to reduce losses associated with power transmission and maintain the required voltage levels. In this case, the presence of DG can cause voltage fluctuation, leading to the appearance of flicker, which is understood as a feeling of instability of visual perception. Similar processes can occur at sharp disturbances close proximity to the DG. The situation can be aggravated by improperly configured DG generators controllers. Therefore, it is necessary to conduct an accurate assessment of the DG plants impact on the power grid, which is a rather time consuming task. The article presents results of the EES working modes simulation with a DG plant implemented on the basis of synchronous turbine generators. The results obtained indicated that during temporary connection of heavy load in the connection unit of DG plant and the use of non-concordantly tuned controllers, there are fluctuations in rotor speed and voltage of generators, the analysis of which indicates the presence of flicker. The same effect can obtained a sudden change in the forecast time for individual controllers of turbine generators speed. Flicker can be removed by applying group control of generators speed controllers.
Comparative Analysis of Deep Neural Networks Architectures for Visual Recognition in the Autonomous Transport Systems
Authors: Ivanov Y S , Zhiganov S V , Liubushkina N N
Published: November 2021

This paper analyses and presents an experimental investigation of the efficiency of modern models for object recognition in computer vision systems of robotic complexes. In this article, the applicability of transformers for experimental classification problems has been investigated. The comparison results are presented taking into account various limitations specific to robotics. Based on the results of the undertaken studies, recommendations on the use of models in the marine vessels classification problem are proposed
Measurement of Impurity Concentration in Turbulent Flows of Ventilation Systems Channels
Authors: Sokolov V , Krol O
Published: November 2021

The work is devoted to the experimental study of the process of impurities diffusion in the circular cylindrical channel and the determination of the coordinates of the average concentration of impurities in the turbulent flow. To ensure the uniformity for the aerosols composition during the studies, the experiments were carried out with solid particles of narrow fractional composition. The use of fine-grained oxide catalyst made it possible to obtain the almost monodisperse material. The experimental installation included the volumetric doser for impurity material, the ejector, the concentration sensor, the section of the vertical pipeline, and manometers for recording the pressure in the system. It is shown that the theoretical and experimental results are in satisfactory agreement with each other, and the existing discrepancy can be explained both by the measurement error and by the presence of spiral motion for the solid phase in the ascending flow. Based on the experiments, it was concluded that the known mathematical positions are adequate and internally not contradictory models of the diffusion process of the impurity substance in the turbulent flow, which can be used to analyze the distribution of the impurity concentration in the channels of the ventilation systems. The results of the studies performed should be taken into account when developing systems for measuring and monitoring the gas-air emissions characteristics of the ventilation systems of industrial enterprises.
Method of Formation of Reference Control Signals for Redundant Manipulators
Authors: Filaretov V F , Gubankov A S , Gornostaev I V
Published: November 2021

The paper is devoted to preservation of dynamic control accuracy of working tools of multilink manipulators when they move along arbitrary spatial trajectories, taking into account the design limits in all degrees of freedom and special cases of position of their links. Preservation of control accuracy is proposed to be ensured by eliminating reach of all degrees of freedom of the manipulators to the limits and to indicated special positions, characterized by ambiguity in solving the inverse kinematic problems of the manipulators, as well as excluding the reach of their working tools to boundaries of working area due to use of a redundant degree of freedom when approaching indicated undesirable positions. The performed simulation has confirmed efficiency of the proposed method.
Analysis and Study of Designs of Sensing Elements of Speed Sensors Based on the Wiegand Effect
Authors: Mikhailov P G
Published: November 2021

Speed sensors are used in various products and systems of mechanical engineering, instrument making, flight and rocket and space technology. At the same time, the main requirements for such sensors include a wide range of measured revolutions, from almost zero to several thousand revolutions per minute. Another requirement is a range of operating temperatures, ranging from cryogenic to temperatures of several hundred degrees. In this case, a prerequisite should be a generator method of conversion, in which energy is not consumed from the outside, but it is generated during the operation of the sensor. The principle of operation of the speed sensor is based on the magnetic pulse mode, in which a private hysteresis loop is formed. The generation of such a characteristic is possessed by mechanically and thermally treated wire made of cobalt-iron-vanadium alloy 52K9F of uniform composition. As a result, the wire acquires a composite magnetic structure consisting of an external hard magnetic layer - a shell, a central soft magnetic layer and an intermediate layer. The layers have different properties, due to which the hysteresis loops of the Wiegand wire have a complex shape. A distinctive feature of the loops is the presence of practically vertical sections of magnetization change - discontinuities corresponding to an abrupt change in the magnetization of the material. The large discontinuity on the loops arises due to the so-called "Barkhausen jump", caused by an almost ideal single magnetic domain stretched along the axis of the wire in its core.
Methods of Estimating the Form of the Probability Distribution Density in Tasks of Processing Measurement Results
Authors: Artyushenko V M , Volovach V I
Published: November 2021

Issues associated with methods for estimating the shape of the probability distribution density curve are analyzed in order to classify them when processing measurement results. For example, such nonparametric methods as the method of histograms and frequency polygon, as well as the method of classification of distributions, are considered. It is shown that the values of the anticurtosis and entropy coefficient can be taken as independent features of the form of symmetric distributions. For probability distribution densities that have a one-sided character, such as multiplicative noise, a skewness coefficient should be added to the parameters to consider. Recurrent procedures for obtaining current estimates of numerical characteristics of analyzed random processes are given. The results of processing a random process based on recurrent procedures are presented. It is shown that when the number of samples increases, the estimates obtained by using recurrent and non-recurrent procedures converge. The scattering of estimates of probability distribution density parameters, such as variance, relative mean square error, and entropy error, is determined.
Algorithm of Dynamic Forming One Whole Raster Photo Map of the Seabed During its Shooting by an Autonomous Uninhabited Underwater Vehicle
Authors: Timoshenko A A , Zuev A V , Mursalimov E S
Published: November 2021

An algorithm has been developed for creating one whole raster photo map of the seabed from images obtained from vertically downward cameras of autonomous underwater vehicles (AUV) using tile graphics. Tile representation of graphical information allows to quickly access the images after lifting the AUV to the surface and reduce the time spent by the operator to analyse the results of the mission. The images were combined using simple geometric transformations based on the data received from the navigation systems of the AUV and the parameters of its camera, so the algorithm can be implemented on the AUV with low-performance onboard computer, as shown in the experiment.
Heat Supply for the Power-Biological Complex from TPP and NPP
Authors: Burdenkova E
Published: November 2021

This work is devoted to the problem of utilization of waste heat from condensers of thermal power plants and nuclear power plants. The waste heat of the condensers of TPPs and NPPs, together with the circulating water, enters the environment, causing its thermal pollution. The use of this heat in an energy-biological complex, for example, in fisheries, increases their efficiency and solves an environmental problem. Compared to ordinary ponds, this energy complex has an almost year-round increase in biomass and accelerated maturation of producers. The article presents a developed methodology that makes it possible to assess the effectiveness of such a fishery. Calculations using this method were carried out for a fish farm raising sturgeons on the basis of the waste heat of a nuclear power plant with a VVER-1200 reactor and a K-1200-6.8/50 turbine
Introduction of Fog Computations to Measuring System Collection and Accounting of Data of Distributed Internet of Things
Authors: Munister V D , Zolkin A L , Aygumov T G , Ozhiganov V E
Published: November 2021

The article deals with the problems of speed and timeliness of the development of control actions from digital management systems. Generalization of researches is given. The role of mathematical applications of game theory for the role in the implementation of fog and boundary computations in the paradigm of the development of digital signal processing systems as well as their optimization value are substantiated.A particular generalization is developed and is given from the processing of an encoded signal sequence that demonstrates the operation of a humidity sensor from the viewpoint of bringing it to the basis of an antagonistic game in order to determine the optimal strategy of the device’s behaviour at a given time interval.The practical significance of the study is confirmed by a new approach to the implementation of economic methods for analysis of probabilistic outcomes within the framework of game theory in an algorithm for analysis of a digital signal for a linear comparator of recorded physical quantities in the form of digital levels. The value of such analysis metrics in network-centric distributed systems of the Internet of things in multiplexing environments is given.
Simulation of Continuous Markov Processes in Discrete-Time for Signals Described by Stochastic Differential Equations
Authors: Artyushenko V M , Volovach V I , Budilov V N
Published: November 2021

We considered the issues associated with methods for solving the problems of representation of continuous Markov processes in discrete-time by the example of radar signals, which are subject to the simultaneous effect of additive and multiplicative noise described by stochastic differential equations. We considered the algorithm, which allows us to carry out computer simulation of fading amplitude, phase and information parameter of the signal in discrete observation time using the example of a continuous frequency-modulated signal, the amplitude of which adheres to the Nakagami distribution that is typical for radar signals under simultaneous effect of additive and multiplicative noise. It is shown that with the help of computer simulation it is possible to create not only optimal algorithms, but also their corresponding optimal structural diagrams, which makes it possible to elevate the processing of radar signals to higher standards.
Support Structures for Seal Switches Located Near Bus Lines
Authors: Kletsel M , Mashrapov B , Barukin A
Published: November 2021

The authors propose three designs for seal switch support structures located near power plant bus lines. The first one has a plate that is attached to bus lines located in the same plane. The second uses a support insulator as the case and can be attached to several bus lines at the same time or each of them individually to provide a wide application range. The third design stipulates seal switch installation on overhead line pylons. The authors provide detailed descriptions of the designs and explain how the trip settings are adjusted on them.
Centralized Protections of Busbars and Electric Motors Connected to Them
Authors: Mashrapov B
Published: November 2021

Centralized protections have several advantages over autonomous protections; however, incorrect actions of the former can result in more serious consequences. The reliability of their operation can be ensured with the help of majorization principle, but the number of devices with different principles of operation is insufficient so far. Three centralized protections are suggested; one of them allows duplication of current transformers. They all are based on the fact that the electric motors of feeders feed a short-circuit point; as a result, the current in a feeder damaged becomes higher than the current at the power input, and the currents in undamaged feeders change the direction to opposite. The conditions for protection actuation are presented. Operation of the protections in different modes is described in detail.
Modeling of Industrial and Technological Processes in Complex Systems Based on Neuro-Fuzzy Petri Nets
Authors: Bobryakov A V , Prokopenko S A , Misnik A E , Krutalevich S K
Published: November 2021

For effective functioning within a complex system, industrial and technological processes are supported by appropriate information-analytical processes that ensure the collection and analysis of information, as well as modeling and making control decisions for the industrial and technological process. A variety of neuro-fuzzy Petri nets with temporal fuzzy neurons is proposed. An example of con-structing a model of an industrial and technological process and the corresponding information-analytical processes is considered. The developed specialized software for modeling industrial and technological processes and the implementation of information-analytical processes is considered.
Prospects for the Application of Reinforcement Learning to Network Traffic Classification Tasks
Authors: Asyaev G D
Published: November 2021

The basic principles and methods of reinforcement learning are reviewed. The problems and approaches for applying a model based on reinforcement learning in the framework of attack prevention are described. The model is built and the hyperparameters of machine learning for the task of classifying network traffic are selected, and its performance on the test data set is evaluated by such quality metrics as accuracy and completeness. The dataset used to implement an agent for selecting the optimal defense strategy for a particular attack has been finalized. Developed an algorithm for using a reinforcement learning neural network for the traffic classification task. A table of rules and rewards for the problem is generated. An agent has been developed and trained to interact with the system. We describe the application of reinforcement learning to the traffic classification task.
Organism State Identification and Forecast Based on Comprehensive Sensor Measurement Processing with the Adaptive Algorithms
Authors: Akishin A D , Nikolaev A P , Pisareva A V
Published: November 2021

Many medical devices are using photoplethysmography (PPG) signals to estimate cardiac rate (CR), respiratory rate (RR), blood pressure (BP) and blood oxygen (SpO2). Photoplethysmography demonstrated its great potential in non-invasive monitoring of the human organism state [17], but application of this method with wearable devices is extremely difficult due to its vulnerability to motion artifacts. This paper presents implementation of a photoplethysmography device on the Raspberry Pi 3 B+ single-board computer.

The work uses adaptive algorithms to study the cardiovascular system state in severe device operating conditions degrading the evaluation accuracy of CR rate and other parameters of the heart rate. Selection of the device component base and component parts was made based on their availability and multi-functionality. The manufactured mockup made it possible to carry out research to determine the most effective algorithms for digital processing of signals received from sensors.

Methods of digital signal processing based on adaptive algorithms are proposed: Wiener algorithms, algorithms based on the method of least squares (MLS) and algorithms based on the Kalman filtering. In the course of measurements taken on simulation objects and volunteers invited to participate in the study, analysis of the results of various measurement processing algorithms operation was carried out. A method is proposed for assessing the accuracy of calculating the CR and analyzing effectiveness of the external noise filtering with adaptive filters. Processing the sensor measurements made it possible to monitor the heart rate with the given accuracy, as well as to predict the human body state.
Determining the Electrical Losses in the Electrical Supply Line of a Sprinkler Using Autonomous Asynchronous Generator
Authors: Oskin S V , Barakin N S , Kumeyko A A
Published: November 2021

The use of an asynchronous generator to power the electrical equipment of the sprinkler is a comprehensive solution that allows you to reduce electrical losses in the supply line. The problem of reactive power compensation for sprinkler machines can be solved by dividing capacitor units into main and additional, the main one is to create the required excitation current in the asynchronous generator, and the additional one is to compensate for the reactive component of the electric motor current. Moreover, an additional unit is installed directly at the outputs of the booster pump to unload the line, and the main capacitor unit is installed near the asynchronous generator.
Enhancing sundanese students’ creative thinking skills using ICARE model on physics concepts: A rasch analysis approach
Authors: Sa’diyah L H , Siahaan P , Suhendi E , Samsudin A , Novia H , Komalasari K , Umar F A , Dalila A A , Fatima W O , Hendriyani D , Purwanto M G
Published: November 2021

Creative thinking skills are vital in physics knowledge as in physics knowledge equal through investigation arrangements on attentions accomplishment subsequently sensing, articulating difficulties, gathering information, dispensation and seeing information, and concluding. This study drives to enhance Sundanese students’ creative thinking skills on physics by the ICARE model through Rasch Analysis. The investigate technique used a pre-experimental technique with one group pretest-posttest design for ten grade pupils (10 boys and 12 girls) and exploitation Rasch analysis to portion the person consistency with bubble chart and variable wright map. The instrument was based on indicators by Torrance. Informations were composed through pretest and posttest to amount creative thinking skills and person consistency on students. The outcomes displayed that ICARE model influenced creative thinking skills through the middling score of 0.61 characterized as intermediate. It can be decided that ICARE model is one of the erudition models that can stimulus and enhance students’ creative thinking skills on physics ideas.
Identification of physics problem-solving skills on senior high school students: An evaluation of e-learning during Covid-19 pandemic in Tuban
Authors: Mufida S N , Sinaga P , Samsudin A
Published: November 2021

On the topic of work and energy, students learned the concepts of work and energy, the relationship between work and energy changes, the law of conservation energy, power, and its application in daily-life. This research aimed to identify and evaluate the achievement of physics problem-solving skills of senior high school students on work and energy topics in distance learning during the Covid-19 pandemic. The quantitative method used was preexperiment with a one-shot case study design. The subjects were determined using the cluster sampling technique. The sample was 246 students of tenth-grade from three schools, namely in the city, middle, and suburb location in Tuban East Java Indonesia. The research results were analyzed by using descriptive quantitative. This research instrument used essay questions and teacher questionnaires. The Kruskal Wallis test showed that the mean of three schools differed significantly by 0.002<0.05. The overall students’ physics problem-solving skills on the topic of work and energy are classified as moderate. The fact of these findings suggests that students still have difficulty in useful description, physics approach, specific application of physics, mathematical procedures, and logical progression and consistent reasons. It is necessary to develop teaching materials that can train physics problem-solving skills.
The application of smartphone sensors to promote cognitive abilities easier and more effective physics learning
Authors: Nuryantini A Y , Adawiyah M R , Ariayuda M A
Published: November 2021

The use of sensor on smartphones as physics learning media encourages teachers to reconstruct teaching methods. This paper presents the effect on students’ cognitive abilities using an accelerometer and a gyroscope sensor simultaneously in learning circular motion, as well as students’ responses and the effectiveness of sensor media on smartphones used. A pre-experimental research design was used in this study which involved 12 students of XII MIPA at SMA Negeri 1 Pagaden Subang Jawa Barat. They learned circular motion guided by the smartphone sensors-based worksheets and were tested using an essay test for cognitive abilities measurements. Meanwhile, students’ responses and the effectiveness were obtained using a Likert scale questionnaire. The improvement of students’ cognitive abilities was significantly higher than the pretest which was obtained from the N-gain with a final value of 0.41. Worksheets using smartphone sensor media were more effective than conventional learning. In addition, students showed a positive response in which 93.75% of students were interested, 85,42% were motivated to learn the circular motion, and 91.14% of students became easier in understanding physics concepts.