bluuebunny/crossref_metadata_2025 huggingface dataset:
Artificial intelligence in a rugged design based on multi-bit rules
Authors: Zolotareva T A
Published: November 2021

In this paper, the technologies for training large artificial neural networks are considered: the first technology is based on the use of multilayer “deep” neural networks; the second technology involves the use of a “wide” single-layer network of neurons giving 256 private binary solutions. A list of attacks aimed at the simplest one-bit neural network decision rule is given: knowledge extraction attacks and software data modification attacks; their content is considered. All single-bit decision rules are unsafe for applying. It is necessary to use other decision rules. The security of applying neural network decision rules in relation to deliberate hacker attacks is significantly reduced if you use a decision rule of a large number of output bits. The most important property of neural network transducers is that when it is trained using 20 examples of the “Friend” image, the “Friend” output code of 256 bits long is correctly reproduced with a confidence level of 0.95. This means that the entropy of the “Friend” output codes is close to zero. A well-trained neural network virtually eliminates the ambiguity of the “Friend” image data. On the contrary, for the “Foe” images, their initial natural entropy is enhanced by the neural network. The considered works made it possible to create a draft of the second national standard for automatic training of networks of quadratic neurons with multilevel quantizers.
Developing a module to convert OpenFOAM computational meshes to the msh format
Authors: Chitalov D
Published: November 2021

The paper reveals the features of developing an application for conversion of computational meshes built in OpenFOAM to the msh format applied for numerical simulation of continuum mechanics (CM) problems with the ANSYS FLUENT platform. Some companies apply this platform in parallel with OpenFOAM that requires a mesh conversion module. Although there are program tools capable to solve this problem, their application involves some difficulties, mainly the necessity to pay for a license, absence of complete documentation, paid technical support. Thus, the described problem is actual and its solution – developing a conversion module – is the study purpose. The article discloses features of the OpenFOAM utility for conversion, a list of technologies to develop a module, module action, results of its performance test using a CM problem. The study findings are statements of scientific novelty and expected practical significance.
Estimation of response time of laser complex data processing nodes
Authors: Chkalov R V , Chkalova D G
Published: November 2021

The work is devoted to problem of information exchange between elements and devices of a telecommunication network for laser technological complex. The laser complex is a combination of hardware and software designed to carry out operations based on the use of laser radiation. Laser complex structure provides a possibility of remote control through a client-server system built on the basis of TCP/IP protocol. The main requirements for industrial network of the complex are performance and predictability of information delivery time. To solve this problem, a probabilistic model for calculating the numerical characteristics of the distribution of requests timeout for external commands from control/monitoring nodes is proposed.
Selection of the optimal set of versions of N-version software using the ant colony optimization
Authors: Aljarbouh A
Published: November 2021

The article discusses the problem of ensuring a high level of software reliability. A software reliability high level can be ensured using N-version programming. N-version software is distinguished by the software components redundancy, designed to solve one problem using different methods. Software redundancy requires additional resources. The challenge is thus to increase the software reliability, while at the same time minimising the resources used. In this article, ant colony optimization is used to solve the problem of choosing the optimal set of versions of N-version software.
Numerical calculation of a statically indeterminate frame by the finite element method
Authors: Sazonova S A , Asminin V F , Zvyagintseva A V , Kurchenkova T V , Rylev S S
Published: November 2021

A numerical calculation of a statically indeterminate frame with high rigidity elements with the computer program STAB12. EXE using the finite element method is performed. An example of generating the source data for the program STAB12. EXE with subsequent processing of the results of the calculations is given. The features of checking the balance of nodes, rods and the frame as a whole based on the use of values taking into account the signs on the diagrams of torques, longitudinal and transverse forces are described. According to the results of calculations, the computer shows the frame in a deformed state.
Recognition of stimulus received by recurrent neural network
Authors: Bartsev S I , Markova G M
Published: November 2021

The study is concerned with the comparison of two methods for identification of stimulus received by artificial neural network using neural activity pattern that corresponds to the period of storing information about this stimulus in the working memory. We used simple recurrent neural networks learned to pass the delayed matching-to-sample test. Neural activity was detected at the period of pause between receiving stimuli. The analysis of neural excitation patterns showed that neural networks encoded variables that were relevant for the task during the delayed matching-to-sample test, and their activity patterns were dynamic. The method of centroids allowed identifying the type of the received stimuli with efficiency up to 75% while the method of neural network-based decoder showed 100% efficiency. In addition, this method was applied to determine the minimal set of neurons whose activity was the most significant for stimulus recognition.
Developing the platform model for problem solving of automated machine learning
Authors: Chastikova V A , Zherlitsyn S A
Published: November 2021

The article discusses the current state of technologies for automated machine learning. The development trends and the nature of the distribution model - MLaaS - are defined. There is highlighted a number of problems of automating the machine learning process, such as: excessive simplification and specialization of tools, vagueness of implemented processes, lack of flexibility in the infrastructure hardware, using closed algorithms. As a partial or complete solution to them, we have proposed the architecture, consisting of separate modules: models, hybridizer, learning algorithms module, testing module, user support module, and a theoretical framework. The main feature of the given architecture is its modularity, transparency and encapsulation of components. Each module is described as a separate element, implemented as an independent microservice. The paper describes the benefits of applying the given approach to the implementation of automated machine learning systems, the need to implement the given or similar standards. For each of the modules, its purposes, the tasks it solves and the implemented functionality, as well as the data necessary for the functioning and their sources are described. A general diagram showing the flows of information exchange between modules is presented. The main scenarios for the resulting system operation, as well as ways of interacting with it and the result of its operation - the generated model - are described.
An iterative feature selection procedure for a classification problem based on the method of logical analysis of data
Authors: Kuzmich R I , Stupina A A , Zhirnova I S , Slinitsyna O V , Boubriak I I
Published: November 2021

An iterative procedure for selecting features for classifying observations is proposed. The main principles of the proposed iterative procedure are ranking and selection of features according to the frequency of their use when constructing logical patterns based on the method of logical analysis of data. The empirical confirmation of the expediency of this procedure is given.
Development of software for simulation of Android applications
Authors: Mehdiyeva A M , Sardarova I Z , Rustamova D F , Imanova T R
Published: November 2021

In this paper the system based on Python programming language for control of Pioneer 3dx mobile robot is considered. To write code in Python initially the ARIA language imported. The Pioneer 3dx’s simulation control is started by creating a robot object and connecting it with the emulator. In case of failed connection Pioneer is performed exiting from the program. Program Codes is written for research works and performs some actions like grabbing and moving the ball with the external gripper, and then putting this ball on another place. This routine code is useful in performing some laboratory and industry tests. The areas, where could be used Pioneer 3dx mobile robot and method of application to the different fields are not limited. As our research shown that the Pioneer 3dx with gripper mainly can be used in industries for routine work, in laboratories for different experiments. The hardware components of mobile robot are pitman motor, motor control, sensors, actuators and communication among them. The main focus was receiving initial data from sensors. Movement is performed based on robot’s motor. The control panels located on the Pioneer robot have indicators that increase capabilities of mobile robot. The software packages used for Pioneer robot is eyes-client mobile application. Additionally, in research work the ultrasonic sensor’s working principle and logic were applied. Core programming language ARIA and its working through Python considered also. The code written during research work was applied on the simulator MobileSim that makes robot perform a series of planned actions. The application of smartphone on Pioneer 3dx robot for speech recognition purpose can improve the functionality and effectiveness of it. Moreover, the additional camera also underlined as new feature for security and monitoring system.
Introducing perforation when applying turbo codes
Authors: Sidorenko A A
Published: November 2021

The problem of adapting the degree of redundancy introduced in the process of error-correcting coding to the changing characteristics of the data transmission channel is urgent. Turbo codes, used in a variety of digital communication systems, are capable of correcting multiple errors occurring in the data transmission channel. The article compares the decoding efficiency for various options for introducing perforation into the code sequence generated by the turbo code encoder. Based on the comparison results, recommendations were made on the most appropriate option for the introduction of perforation.
Investigation of the effectiveness of metric classification methods in identifying attacks in VANET
Authors: Parfenov D , Bolodurina I , Grishina L , Zhigalov A
Published: November 2021

This paper discusses the problem of improving the efficiency of metric machine learning methods of identification attacks in vehicular adhoc networks (VANETs). The main idea of this research is to select the type of nonlinear functions for calculating the distances between the objects of the sample, describing the traffic of VANET using metric methods, such as the method of k-nearest neighbour with linearly decreasing weights and the Parzen window method. The analysis of the effectiveness of the methods considered was carried out on a synthetically generated sample with three different types of attacks on the network. Computational experiments have shown that the k-nearest neighbour method with decreasing weights based on an exponential function with base a < 1 is more efficient than the Parzen window method by about 0.3% and has an accuracy of 84.15%.
Design of inductors for the installation of induction soldering of pipeline joints in the oil and gas industry
Authors: Stupin A O , Rogova D V , Nozdrenko E A , Kukartsev V V , Cherepanov A I , Stashkevich A E
Published: November 2021

The article discusses the use of induction brazing for connecting oil and gas pipelines. The rationale for the choice of induction brazing in the oil and gas industry is considered. The work calculates the main parameters of the inductor. On the basis of calculations, using a mathematical apparatus, a schematic diagram of an inductor with a diameter of 90 mm is created for installing induction soldering. It is proposed to use and develop inductors of various diameters (60, 90 and 135 mm) to create an induction unit that allows connecting pipelines of oil and gas equipment in order to increase the reliability of equipment and the efficiency of oil and gas production and processing.
Application of the digital model thermal errors of machine tools in automated production
Authors: Pozevalkin V V , Polyakov A N
Published: November 2021

The article presents a predicting method for a machine tool thermal error based on a nonlinear autoregressive neural network with an external input, as well as methods for smoothing experimental data obtained from measuring devices by approximation using polynomial regression and the gray systems theory. The development of accurate and robust thermal models is a critical step in achieving high productivity in thermal deformation reduction techniques on machine tools. Because thermal deformations of the machine structure caused by temperature increase often lead to thermal errors and reduce the accuracy of machining parts. The use of neural networks is a promising direction in solving forecasting problems. The authors propose a block diagram of a thermal process digital twin based on a neural network, which can be used in automated production. The results of the experiment carried out for the machine model 400V are obtained in the form of an assessment of approximation quality and accuracy of the forecasting model. The results show that the use of the proposed smoothing methods and a model for predicting a machine tool thermal error based on a neural network can improve the forecast accuracy.
Analysing detection bands of two-spectral reflection method to identify forest species composition
Authors: Belov M L , Belov A M , Gorodnichev V A , Alkov S V
Published: November 2021

The optical reflection method is considered for detection of the forest areas where coniferous or broadleaved trees are dominant. Statistical modelling of correct detection and false alarm probabilities for identifying dominant (coniferous or broadleaved) tree species by the two-spectral reflection method has been conducted. It has been shown that monitoring enables us to identify dominant (coniferous or broadleaved) tree species with correct detection probability close to 1 and false alarms probability ~ second decimal places for the temperate climate zone at the wavelengths of 532 and 1540 nm or 532 and 1480 nm. As to the subtropical climate zone, due to a great variety of reflection spectra of vegetation, a selection of the spectral detection bands for reliable identification of dominant coniferous or broadleaved tree species is possible only for specific forestlands where the number of evergreen broadleaved and coniferous tree species is relatively small.
Liquid metal sliding contacts for electric machines
Authors: Egorov A V , Kaizer Yu F , Lysyannikov A V , Kuznetsov A V , Bezborodov Yu N , Shram V G , Kuzmin N V , Kuznetsova P A
Published: November 2021

The electric sliding contact in the brush mechanism is one of the most unreliable components of electric machines of alternating and direct current and other electrical equipment in which the transmission of electric current is carried out using sliding contacts that require fairly frequent maintenance and can be a source of sparking. It is possible to increase the reliability and efficiency of electric machines with sliding electric contacts by replacing the dry friction mode with the liquid friction mode in the sliding electric contact. The most appropriate material for use in the construction of a liquid metal sliding contact is gallium. When replacing the sliding electrical contacts of asynchronous electric machines with a phase rotor from traditional solid to liquid metal gallium, it is possible to increase their power up to 1.4 times due to the availability of a higher thermal operating mode.
Development of a mathematical model to demonstrate the impact on the fan blades of a high dual-circuit turbofan engine
Authors: Shavelkin D S , Kaigorodova V A
Published: November 2021

A mathematical model describing the impact of a foreign object (bird) on the fan blades of a turbofan engine with a high degree of dual circuitry was developed. The validation of the calculation studies was evaluated based on the examination on the prototype engine. Considering the increasing application of composite materials in the designs of prospective aviation gas-turbine engines and assuming the importance of the issue related to providing a sufficient level of airworthiness special attention is paid to the modeling and assessment of the condition of composite fan blades. In this connection the developed model allows to investigate the stress-strain state of the blades made of different, including composite materials, of the fan under the influence of foreign objects and birds on them.
Comprehensive assessment of the production of a pipe billet with a flange by forging at various temperature conditions
Authors: Bogdanov S B , Alekseev A V , Gribachev Y V
Published: November 2021

With the help of QForm simulation software, a comprehensive assessment of the production of a pipe billet with a flange is carried out. The paper studies the influence of the temperature of the die tooling on the technological extrusion force, the stress-strain state in the workpiece, as well as the change in the temperature of the semi-finished product, die and punch in the process of hot forging. The article presents the force graphs, the maximum values of the intensity of stresses and the intensity of deformations in the part, as well as the highest values of temperatures.
Quality control in cyber-physical systems of smart electronics manufacturing
Authors: Dzyubanenko A A , Korshunov G I
Published: November 2021

The creation of high-tech smart industries is observed in dynamically developing industries, which include the production of electronics and the automotive industry. The concept of “smart manufacturing” is closely related to the concept of cyber-physical systems, which integrates the main elements of digitalization and intellectualization. This concept provides for the continuous improvement of intellectual “cybernetic” resources for the effective management of the “physical” environment considered in this problem area. Improvement of technologies, ensuring high rates of reproducibility and suitability of equipment creates conditions for defect-free production. However, there remain the problems of recognizing patterns represented not by an obvious marriage, but by some not fully defined inconsistency on a set of requirements. The need to disclose uncertainties of this kind is typical for surface mounting technologies for printed circuit boards. The introduction of more and more advanced automatic optical inspections, containing the possibility of introducing intelligent (cybernetic) means, creates conditions for improving the quality of printed circuit boards as a “physical” environment. It is also important to minimize the “human factor”, the presence of which is still used when making decisions on the results of control. In the article, ensuring the rhythm of digital production and increasing the reliability of control in quality management in smart high-tech industries using the example of electronics production.
Cyber-physical systems matrix control model
Authors: Gurjanov A V , Zakoldaev D A , Zharinov I O , Zharinov O O
Published: November 2021

The Industry 4.0 technologies oriented for the modern industry as an application to solve the cyber-physical production control general task are viewed. A task to control is positioned as a hierarchy, which require some special schemes cyber-physical systems interaction organization to be developed. The control task hierarchy is converted to the control means hierarchy, within which they preserve the cyber-physical systems groups coordination unity organized in the company functional divisions in structure principle with variable equipment consistency. Information and functional cyber-physical systems interconnection are proposed to be defined within the technical architecture providing cyber-physical production complex automatizing. In the control system they underline the information component realizing not only calculation functions measuring but also net communication. Controlling and being controlled cyber-physical systems are proposed to be united into structures actively interacting with functional company divisions into closed automatic loops working out information and signal actions. There is a cyber-physical production hierarchy structure example given based on control processes tides formalized in physical and virtual levels. There is a cyber-physical systems matrix control model given to coordinate calculations, communications and industrial automatics functionality.
Investigation of the possibility of obtaining powdered cellulose using a non-knife method of grinding fibrous semi-finished products
Authors: Kaplyov E V , Yurtaeva L V , Marchenko R A , Vasilyeva D Yu , Alashkevich D Yu
Published: November 2021

The pulp and paper industry occupies one of the leading places among various sectors of the national economy in terms of versatility and prevalence throughout the world, as well as the need for its products for the economy of any country. In addition, with the advent of printing systems that operate at an increasingly faster speed and perform complex tasks, the requirements for the properties and quality of paper have increased. At present, powdered cellulose is a promising direction in the development of the pulp and paper industry. The article discusses the possibility of obtaining powdered cellulose with preliminary grinding on a knifeless grinding plant of the “jet-barrier” type. The morphological properties of the fiber and the degree of polymerization of powdered cellulose are given depending on the degree of grinding.
Synthesis of a fuzzy controller for identification and quantification of disturbances by trends
Authors: Muravyova E A , Imaev R F
Published: November 2021

This article describes the main stages of constructing a fuzzy controller that identifies disturbances in the automatic control system by trends on the example of the brine cycle, namely, heating the purified one going to electrolysis. This method can be implemented in perturbation control systems for the formation of control actions, as well as for diagnostic purposes. The aim of the study is to synthesize a fuzzy controller for identifying and quantifying perturbations by trends. The article proposes a method for estimating perturbations by trends. A mathematical model of processes implemented in the Mathcad environment is constructed. A conceptual model of a fuzzy controller for determining the perturbation is implemented. As a result of the research conducted on the basis of the proposed method, two fuzzy controllers were synthesized that quantify disturbances in the water heating cycle, namely: the deviation of the temperature of the purified brine entering the heat exchanger, as well as the deviation of the water temperature in the tank from the norm. The developed project is of practical importance, since the information about disturbances obtained as an output value from the fuzzy controller can be used in the diagnosis and assessment of the system state at any time, which, in turn, can be used for smoother control when applying a correction signal to the controller that controls the dampers and pumps, as well as to prevent accidents.
The use of cold plasma technology in the surface disinfection system
Authors: Nguyen-Kuok S , Bolnokin V E
Published: November 2021

The work is devoted to the presentation of the system analysis results of hierarchical processes of the viral pandemic and development, based on the use of cold plasma, of technical means to counteract viral threats. The main place is occupied by the description of the application of cold plasma technologies for the purpose of viral disinfection and countering the spread of viruses in various environments. The results of practical field experiments are presented
Estimation of the optimal frequency range of EM waves for the implementation of a wireless channel of charge activation during drilling and blasting operations
Authors: Kudinov D S , Radaev V V , Kokhonkova E A , Romanov V V , Maikov A
Published: November 2021

The article analyzes the methods of wireless detonation of underground charges during drilling and blasting operations. The technologies considered are intended mainly for disrupting the integrity of rocks during tunneling and extraction of mineral resources in mines and quarries, as well as for the controlled demolition of buildings. The methods presented in the scientific press do not provide sufficient accuracy of time synchronization between the moment of the explosion and the command to launch the operator of the explosive machine, which is a necessary requirement for seismic exploration, and are also based on the use of magnetic antennas for wireless activation of detonators located at a depth of 30 m. The article, by the authors, on the basis of the analytical solution of equations and computational modeling, considers the physical processes of propagation of electromagnetic fields and currents induced by a grounded electric dipole, which is an alternative method of transmitting radio signals to a linear group of detonators. The most favorable operating frequency range of the channel is also analyzed based on the absorbing properties of the medium.
Physical and technical aspects of the technology of energysaving drying of wood in chambers with natural circulation of the agent
Authors: Gorokhovsky A G , Shishkina E E , Tikhonov E A , Drabkina E V , Marinchenko T E , Kalimullin M N , Romanyuk N N
Published: November 2021

The problems of energy saving are one of the most urgent problems of modern industry and timber processing is no exception in this. In all wood processing, wood drying stands out for its energy consumption. A possible direction for significantly reducing the energy intensity of wood drying is the use of modes based on the phenomenon of thermal and moisture conductivity in chambers with a natural circulation of the drying agent. The theoretical and experimental studies carried out by the authors made it possible to create a wood drying technology that reduces the energy consumption of the process by 40-45% with a certain (15-17 %) loss in the productivity of drying equipment compared to chambers operating with forced circulation of the drying agent.
Evaluation of the effectiveness of the building heating control system
Authors: Medyakov A A , Suhanova K V , Anisimov P N , Maryashev A V , Svechnikov V N
Published: November 2021

Currently, improving energy efficiency and introducing energy-saving technologies is a strategic task for all national economies. Improving the efficiency of buildings and reducing energy consumption in homes can lead to real reductions in resource consumption while ensuring the required level of living comfort. The use of different types of regulation of the building heating system allows the heat transfer of heating devices to be as close as possible to the current heat demand of the object in order to maintain the required internal temperature with a constant change in external conditions. The paper considers the following types of regulation: room-byroom regulation, regulation according to the temperature schedule of CHP and weather regulation. A calculation of each type of regulation was carried out and comparisons of room-by-room regulation with regulation according to the temperature schedule of CHP plants and with weather regulation were presented. As a result, the most effective option was proposed.
Reaction in the field of subsoil gases to the preparation of the earthquake on March 16, 2021 with MW = 6.6 (Kamchatka, Russia)
Authors: Firstov Pavel , Makarov Evgenii
Published: November 2021

The paper presents the data of monitoring of subsoil gases on Kamchatka peninsula. Before the earthquake with Mw=6.6 on March 16, 2021 near Kamchatka, anomalous variations were revealed in the field of subsoil gases, which are probably associated with the passage in the earth’s crust of solitary deformation pulses, called deformation waves. Such deformation pulses can affect the permeability of rocks and cause changes in the radon flux to the surface at the locations of the sensors. Based on the complex of emanation data, the earthquake of March 16, 2021 with Mw=6.6 was successfully predicted.
Experimental quantification of measurement uncertainty and other verification criteria for analytical test methods
Authors: Miraliyeva A K , Rashidov A S , Ernazarova Z X , Masharipov Sh M , Mirpayziyeva G M
Published: November 2021

If the measurement produces a numerical result (or the stated result is based on a numerical result), then it is necessary to evaluate the uncertainty of these numerical results. If the test methodology does not provide for a rigorous, metrologically and statistically reliable estimate of measurement uncertainty, the test laboratory should attempt to reasonably assess the uncertainty of the measurement results. This is applicable in the case of test methods both rational and empirical. As well as in the laboratory activities, verification of test methods plays an important role in order to guarantee the competence of the laboratory by checking for the criteria of Kohren, Grabbs and others. In cases where test results are not numerically expressed or based on numerical data (e.g., fit/unsuitable or positive/negative, or based on visual or sensory perceptions or other forms of quality analysis), estimates of uncertainty or other variability of results are not required. Nevertheless, laboratories are advised to have an idea of the variability of the results, if possible. The importance of the uncertainty of qualitative test results is undeniable, as is the fact that the necessary statistical methodology (procedure) exists for the calculations. However, due to the complexity of the issue and the inconsistency in the approaches, it is not currently necessary for laboratories to assess the uncertainty of qualitative test results. However, this issue needs to be considered. The article discusses estimates of uncertainty of analytical measurements taking into account the requirements of regulatory documents. The criteria for verification of measurement methodology based on experimental works are also considered and analyzed.
Biodegradation chemistry of new adipate plasticizers
Authors: Vikhareva I N , Aminova G K , Abdrakhmanova L K , Mazitova A K
Published: November 2021

Plastics are materials that, in the composition of various municipal solid waste, enter the environment in large quantities. Lightness and strength, the ability to withstand the effects of external factors, long-term use led to their widespread use. However, some of the additives needed to improve the performance of polymer products are highly toxic and pose a serious environmental problem. In this regard, the development of environmentally friendly PVC plasticizers is technically important. The article describes the preparation and study of the properties of ester additives based on adipic acid and ethoxylated butanol. The mechanism of biodegradation of the synthesized adipates was studied, the resulting metabolites were determined. The ecological safety of the developed plasticizers in the process of utilization in natural conditions is shown.
Improving the reliability of the energy supply to the district boiler house
Authors: Balzamov D S , Bronskaya V V , Lubnina A A , Minnegalieva Ch B , Khairullina L E , Khabibullina G Z , Ignashina T V , Kharitonova O S
Published: November 2021

Currently, measures are being worked out at generation facilities, in particular at district boiler houses, the implementation of which will increase the reliability of both individual elements of the system and the entire energy supply system as a whole, improve its technical and economic indicators, and achieve the target financial indices of the enterprise. As one of such measures, the article considers the ways of organizing a mini-TPP (thermal power plant) on the example of a large district boiler house for the purpose of energy supply for their own needs. This solution will increase the energy independence of the boiler house from the external network, reduce the cost of electricity consumption. The paper presents the results of a technical and economic analysis of options for organizing own generation, taking into account the actual operating conditions of the boiler house, linking the mini-TPP to the existing communications of boiler house, the impact of the joint operation of the mini-TPP and the boiler house on the sanitary zone. Based on the analysis of the loading graphs of the electric equipment of the boiler house, the required capacity of the gas engine generator plant and the place of its installation on the production site are determined. The operation of the gas engine generator plant involves the production of electric energy only for its own needs without issuing it to an external electrical network, in connection with which an automation system is provided that does not allow electricity to be issued to an external network. This restriction is related to the requirements of the technical specifications of the electric grid company.
Estimation of stator and rotor forms distortions influence on operating parameters of a hydrogenerator
Authors: Achitaev A A , Savelieva N S , Naumkin N S , Rusina A G
Published: November 2021

The field calculation was carried out using finite element method of the Ansys Maxwell software package and verification in the Matlab Simulink software. It should be noted that there are several regulatory documents that describe criteria for permissible distortion of the rotor shape, where the air gap between the stator and the rotor at diametrically opposite points should not differ from each other by more than ± 20% from the average value equal to their halfsum. In this work, a calculation was carried out covering this interval of diameter change; an analysis was carried out considering change in range of ± 35% of the air gap’s width’s value. Results of the research showed that a change in a value of the air gap up to 10% would make a significant contribution to magnitude of magnetic field induction, which increases the value of main losses in a core of magnetic circuit of the generator. Also, there is a significant decrease in voltage (from 25 to 50%) of a nominal voltage in nominal power mode, which requires increase in current in field magnetizing coil, leading to ohmic losses’ increase in rotor’s windings.
Wear resistance increase of sealings of mud end of pump
Authors: Karnaukhov I V , Lunev A S , Pankiv M D , Afanasov V I , Dunaeva S P
Published: November 2021

In this paper, the qualification and the principle of operation of mud pumps are considered. The analysis of the malfunction of the hydraulic part of the pump is also considered. The importance of the work is due to the fact that it was proposed to introduce a support and sealing part of the cuff made of a material of different hardness. The working conditions of the drilling pump from the adopted drilling technology are also considered. An experiment was conducted with the help of which the dependence of the degree of wear of the seal on time was revealed, depending on the material. The importance of the work is due to the fact that the introduction of the support and sealing part of the cuff from a material of different hardness was proposed.
Experimental analysis of a prototype voltage stabilizer using an optoelectronic proximity voltage relay
Authors: Karimov R Ch , Kurbanova N M , Musashayxova N A , Makhamadjanov R K , Togaev A S
Published: November 2021

This article discusses the issues of experimental analysis of power quality indicators when using a voltage stabilizer using an optoelectronic proximity voltage relay. Where, the booster voltage stabilizer, the magnetizing windings of which are switched using non-contact voltage relays made on the basis of semiconductor devices, as well as the duration of the transient process when switching active and active-inductive loads connected to the output of the stabilizer. In addition, the article provides information regarding the performance of the developed prototype voltage stabilizer using an optoelectronic contactless voltage relay and verification of an experimental study of the operation of installations with their use. Also presented is material on the experimental study of a prototype voltage stabilizer using an optoelectronic contactless voltage relay in various operating modes. Summarizing the results of experimental studies of a prototype voltage stabilizer using an optoelectronic contactless voltage relay, it can be stated that it fully meets the requirements for such devices and can ensure reliable operation of the power supply network of household electrical consumers.
Physical-and-chemical calculations of safe mode of propane transportation
Authors: Katansky A A , Zhuravleva N G , Pankratova M E , Pastushkova M A , Trotsenko A A
Published: November 2021

The key criteria used to assess fire-and-explosive hazard of any facility are: flash point, self-ignition temperature and minimum ignition energy. This article addresses how fire-and-explosive hazard criteria can be used to forecast emergency situations while transporting great quantities of flammable substance – propane, based upon ambient environment temperature. Calculations that were made have led to a conclusion that fire-and-explosive safety concentration mode for propane handling will be: lower concentration value is equal to 1.27 % or under than that value; upper concentration value is equal to 13.96 % or greater than that value. When selecting safe transportation and storage conditions for self-igniting combustible substances, great attention is given to relationship between environment, mass of substance transported and time-period to spontaneous ignition. For propane, the safe self-ignition temperature is deemed to be less than 360°C. Calculations for theoretical experiment regarding propane transportation were made based upon three critical temperature values: 1) 25 °C+10 °C - initial starting point when ambient temperature is 25 °C (roadway temperature is disregarded because ambient temperature is not high enough); 2) 60 °C+10 °C – point of arrival where ambient temperature is 60 °C; 3) 470 °C – propane self-ignition temperature. This helped us to figure out that propane can be stored and transported safely if the minimal electric ignition source is under 4*10−6
Joule.
A multi-PMT optical sensor for IceCube-Gen2
Authors: Basu V.
Published: November 2021

A new long optical module (LOM) is under development for IceCube-Gen2, the proposed expansion to the IceCube neutrino observatory at the South Pole. The module is housed in an elongated borosilicate-glass pressure vessel, the size of which is constrained by the borehole diameter, which impacts drilling economy. The designs under consideration use either 16 or 18 4-inch PMTs, conditional on future performance tests, mounted so as to guarantee full angular coverage. Modular electronics have been custom-designed to fit into the available space and to minimize cost and power requirements for the ∼10000 modules to be installed. We will provide an overview of our approach to these design considerations and summarize the results of our tests and simulations. Prototype modules will be installed in the upcoming IceCube Upgrade.
Analysis of the first KM3NeT-ORCA data
Authors: Pestel V. , Aly Z. , Nauta L.
Published: November 2021

ORCA, Oscillation Research with Cosmics in the Abyss, is the low energy KM3NeT neutrino underwater detector, located in the French Mediterranean Sea. It comprises a dense array of optical modules designed to detect Cherenkov light emitted from charged particles resulting from neutrino interactions in the vicinity of the detector. Its main physics goal is the determination of the neutrino mass hierarchy by quantifying the matter-induced effect on the oscillation probabilities of atmospheric neutrinos in the energy range, 3–50 GeV, where the effects of neutrino oscillation phenomena are dominant. In 2019, four detection units were operational. Two more had been added in early 2020. This work presents an overview of the detector performance in the 2019 configuration, as well as its sensitivity to neutrino oscillations.
Progress report on addressing meteotsunami risk in the eastern Yellow Sea
Authors: Kim Myung-Seok , Woo Seung-Buhm , Eom Hyunmin , You Sung Hyup
Published: November 2021

On 31 March 2007, strong, tsunami-like waves of 1.0–2.5 m were recorded at most tide gauges along the west coast of Korea. The following year, on May 4, unexpected, abnormal waves in the eastern Yellow Sea reached a maximum height of ∼1.3 m. Both events occurred without warning, resulting in severe loss of life and property. Subsequent analysis found that these tsunami-like waves were meteotsunamis generated by air pressure oscillations. Evidence of possible meteotsunamis has been recorded by existing observation systems. However, the lack of understanding of the phenomenon and meteotsunami-specific monitoring system has hindered community preparedness, resulting in severe damage. We utilized existing observation systems (meteorological stations, tide gauges, and radar) during 2018 to develop a real-time meteotsunami monitoring system in the eastern Yellow Sea. This system detects the intensity and propagation of air pressure oscillations to identify potential coastal hazards and prevent damage caused by meteotsunamis. Two air pressure disturbance methods for measuring intensity of air pressure oscillation (a range of pressure changes over a 60 min window vs the rate of pressure change over a 10 min window) were compared, and several test operations were performed during development of the proposed system. The progress and limitations of the current observation and monitoring system were confirmed based on recent monitoring reports of air pressure jumps during the meteotsunamis on 7 April 2019. To address the insufficient lead time of meteotsunami warnings, installation and testing of open-ocean buoys outfitted with pressure sensors commenced in 2019.
Bacteria Detection for Corn Growth and Productivity in Chlorpyrifos Contaminated Land based Bioremediation
Authors: Eko H P , Nurjannah  , Nurul A
Published: November 2021

Chlorpyrifos is one of the most active pesticides used to control pests in corn cultivation. Excessive and sustainable use of pesticides will cause the accumulation of active ingredients on agricultural land to further disrupt plant growth. This study aims to identify bacteria capable of increasing the growth and yield of maize on soil contaminated with Chlorpyrifos. The results showed the application of Pseudomonas sp. and Micrococcus sp gave better growth and production of maize than without bacterial application. Treatment P9 increased plant fresh weight and root volume by 70, 95 % and 16.6% compared to control. P8 is able to increase the weight of corn ear15, 96 %, by weight cob without husk 26.30%, 13.30% cob length and ear diameter, 15.27%. The effectiveness of the application of bacteria in a mixture is higher than the application alone.
The reuse of military campgrounds following the interventions of environmental design and the grant of their use to the contemporary city. The case study of “the Velissario military campground in Ioannina”
Authors: Brikou A , Zavraka D , Vitopoulou A
Published: November 2021

The current case study presents a proposal for the redevelopment and reuse of the Velissario military campground in Ioannina, in western Greece. The military base is considered a prohibited area and an urban void completely cut off from the city. Firstly, the concept of sustainable development, the legislative framework, the historical background of environmental protection and examples of the reuse of other military bases worldwide are mentioned. Secondly, the significant characteristics of the surrounding area and the interventions according to the environmental design for the sustainable development of the city are presented, such as the preservation of the existing greenery, the creation of new green areas and their connection with the adjacent Pyrsinella park, for the creation of a Metropolitan Park, as well as the construction of a lake. Furthermore, the creation of sports and cultural facilities, hiking and cycling trails, the preservation of the necessary existing military buildings and the construction of new buildings is suggested. Environmentally friendly structural materials and renewable energy resources will be utilized. Both water and litter created in the park will be recycled and reused so that they compose the Prototype Park of Sufficient Environmental Management that we aspire to create.
Quantitative methodology for the estimation of the environmental impact of wind farms – The case of Greece and application on the country’s operating units
Authors: Lazarou Giannis , Giannarou Sofia
Published: November 2021

Following the EU guidelines towards a carbon free electricity sector by 2050, wind energy is expected to contribute a large part of the produced electricity, if not the largest. In this respect, wind installations are expected to multiply over the next years. There is significant development until today and wind is generally considered as a “clean” source of energy. However, although arguably less than other sources, the impacts concerning wind installations are certainly there amidst ever-growing local opposition and will certainly grow, especially in locations with high density. Attempting to quantify the total impacts per local regions in the case of Greece, a methodology is developed for those impact factors that are considered the most important. Certain focus areas are used for applying this methodology, based on installation density, location inside natural protected areas, as well as locations of touristic value. The results show that in general the total impacts might be considered on average mild to low. The tool developed is a first attempt to evaluate impact in a cumulative way and help investors, policy makers and local communities work together in achieving the best possible outcome. Further work is necessary to further develop this methodology, verify and detail the formulas used and establish a robust pattern that will be a useful tool for everyone to use.