bluuebunny/crossref_metadata_2025 huggingface dataset:
Psychological and pedagogical basic principles of professional formation of educational psychologist
Authors: Manaenkova Marina P. , Kalyakin Evgeny V.
Published: June 2021

We consider the issue of personal and professional development of future educational psychologists. We present theoretical approaches of Russian and foreign scientists to the issues of the correlation of professional training and the professional development of a person. We consider the process of professional formation in general and in the psychological and pedagogical sphere of activity in particular. We focus on the federal state educational standards of higher education of the latest generation – the master’s degree in psychology and pedagogy, and on the corresponding professional standard as a normative basis for the organization of the educational process in a modern university. The expediency of modernizing the modern educational system in higher education, the reasonableness of the transition to the current competence-based approach as a methodological basis for the organization of the educational process in higher education is argued. The development of professionalism and, most importantly, socially important personal qualities is essential when organizing a developing educational space in higher education. We analyze the volume of the personal component of a specialist as an important component in the concept of professionalism. In conclusion, the expediency of taking into account the basic psychological and pedagogical conditions when designing the professional development of a future educational psychologist is proved.
La memoria documental del exilio republicano español en los archivos estatales a través del Portal de Archivos PARES
Authors: Villanueva Toledo Mª Josefa
Published: June 2021

El objeto del artículo es analizar el estado de la cuestión de los fondos documentales que custodian los Archivos Estatales del Ministerio de Cultura sobre el Exilio republicano español de 1939 y su retorno a España, así como la descripción y digitalización de los mismos. Tiene como finalidad poner estos recursos archivísticos a disposición del usuario especializado y del público en general a través del Portal de Archivos Españoles, PARES.
ULOGA MALIH UGOSTITELJSKIH PODUZEĆA U POVEĆANJU KONKURENTNOSTI OPATIJSKE RIVIJERE
Authors: Cerović Milohnić Ines
Published: June 2021

U ovom se radu analiziraju čimbenici koji utječu na povećanje uspješnosti malih ugostiteljskih poduzeća na temelju opsežnih intervjua s menadžerima ovih poduzeća na području Kvarnera odnosno Opatijske Rivijere. Istraživanje je između ostalog obuhvatilo stavove menadžmenta malih ugostiteljskih poduzeća o problemima s kojima se suočavaju u svom poslovanju kao i prijedloge mjera i akcija koje je potrebno poduzeti sa svrhom povećanja konkurentnosti destinacije Opatijske Rivijere.
ZNAČAJ I ULOGA NAUTIČKOG TURIZMA U STRATEGIJI RAZVOJA TURIZMA OPATIJSKE RIVIJERE
Authors: Gračan Daniela
Published: June 2021

Turizam današnjice bilježi diferenciranost i orijentiranost ka održivom razvoju. U tom kontekstu turistička destinacija mora istražiti svoje mogućnosti (u kvalitativnom i kvantitativnom smislu) i u skladu s njima razvijati one oblike selektivnog turizma koji će joj osigurati komparativnu prednost na turističkom tržištu. Opatijska rivijera posjeduje resursnu osnovu razvoja nautičkog turizma. No, dosadašnji razvoj ne pokazuje rezultate primjerene mogućnostima. Stoga je nužno strateško promišljanje razvoja nautičkog turizma i njegovo jače uključivanje u turističke tijekove.
Naukotheka
Authors: Turkanov Igor Fedorovich
Published: June 2021

An automated information system of electronic interaction forming a joint information and communication space for fundamental research and application development, as well as applying in the field of education by citizens, scientific specialists, Russian Academy of Sciences information systems, scientific organizations and institutions. In the near future Naukotheka has the potential to provide support of education and fundamental research for the countries of the Eurasian Economic Union at the level of platforms such as Scopus, Web of Science, Google Scholars, etc.
Language recognition methods and Voynich Manuscript analysis
Authors: Orlov Yurii Nikolaevich
Published: June 2021

The statistical properties of letters frequencies in European literature texts are investigated. The determination of logarithmic dependence of letters sequence for one-languge and two-language texts are examined. The pare of languages are suggested for Voynich Manuscript. The internal structure of Manuscript is considered. The spectral portraits of two-letters distribution are constructed.
Mathematics of the future
Authors: Voytsekhovich Vyacheslav Emerikovich
Published: June 2021

Mathematics has entered a crisis of complexity. The main reason is the use of immutable concepts according to the law of identity of Aristotle's logic. The evidence has become super-long, unverifiable. Overcoming the crisis is possible in the transition from immutable concepts to "mobile" ones, in the generalization of the law of identity. In modern mathematics, there are prerequisites for such a transition – in qualitative theory, probability theory, algorithm theory, and foundations. The future of mathematics lies in the development of categories as transformative concepts.
Двухэтапная RANS-DDES модель и результаты расчета нестационарных воздействий на возвращаемый аппарат и двигательный отсек космического корабля при их аварийном разделении
Authors: Гарбарук Андрей Викторович , Garbaruk A V , Стрелец Михаил Хаимович , Strelets Mikhail Khaimovich , Шур Михаил Львович , Shur Mikhail L'vovich , Дядькин Анатолий Александрович , Dyadkin Anatoly Alexandrovich , Михайлов Михаил Васильевич , Mikhailov Mikhail Vasil'evich , Рыбак Сергей Петрович , Rybak Sergei Petrovich , Даньков Борис Николаевич , Dankov Boris Nikolaevich , Косенко Алексей Павлович , Kosenko Aleksei Pavlovich
Published: June 2021

Представлены двухэтапная RANS-DDES модель и результаты расчетов турбулентного транс- и сверхзвукового обтекания пилотируемого космического корабля при аварийном отделении возвращаемого аппарата после включения двигательной установки системы аварийного спасения экипажа на начальном этапе полета. Основное внимание уделяется определению нестационарных аэродинамических и акустических воздействий на возвращаемый аппарат и на обтекатель двигательного отсека. Показано, что эти воздействия достигают максимальных значений на поверхности обтекателя в области, где с ней взаимодействуют турбулентные структуры сдвигового слоя, отрывающегося от кромки теплозащитного экрана возвращаемого аппарата. Кроме того, обнаружено, что при трансзвуковых режимах полета на начальной стадии разведения в зазоре, образующемся между возвращаемым аппаратом и двигательным отсеком, возникают автоколебания аэроакустической природы.
Electromechanical guidance system based on a fuzzy proportional-plus-differential position controller
Authors: Paranchuk Ya. S. , Shabatura Y. V. , Kuznyetsov O. O.
Published: June 2021

Purpose. The purpose is to develop solutions for the implementation of optimal laws of arms positioning, overshoot-free and requiring no post-adjustments. Method. The control model is based on the fuzzy set theory; and the structural modeling methodology is used to study the dynamics indices. Results. The structural scheme of the positional electromechanical system with a fuzzy proportional-plus-differential position controller and the method of control adaptation to the position reference signal change are obtained. Scientific novelty. A model of a fuzzy proportional-differential controller signal adaptation in the structure of a positional electromechanical system is proposed. Practical value. A solution is obtained for the implementation of optimal guidance process, non-overshooting and requiring no post-adjustments, also featuring the maximum weapons speed and minimal sensitivity to parametric disturbances.
Simultaneous optimal integration of photovoltaic distributed generation and battery energy storage system in active distribution network using chaotic grey wolf optimization
Authors: Belbachir N. , Zellagui M. , Settoul S. , El-Bayeh C. Z. , Bekkouche B.
Published: June 2021

Goal. The integration of photovoltaic distributed generations in the active distribution network has raised quickly due to their importance in delivering clean energy, hence, participating in solving various problems as climate change and pollution. Adding the battery energy storage systems would be considered as one of the best choices in giving solutions to the mentioned issues due to its characteristics of quick charging and discharging, managing the quality of power, and fulfilling the peak of energy demand. The novelty of the proposed work is the development of new multi-objective functions based on the sum of the three technical parameters of total active power loss, total voltage deviation, and total operation time of the overcurrent protection relay. Purpose. This paper is dedicated for solving the allocation problem of hybrid photovoltaic distributed generation and battery energy storage systems integration in the standard IEEE 33-bus and IEEE 69-bus active distribution networks. Methodology. The optimal integration of the hybrid systems is formulated as minimizing the proposed multi-objective functions by applying a newly developed metaheuristic technique based on various chaotic grey wolf optimization algorithms. The applied optimization algorithms are becoming increasingly popular due to their simplicity, lack of gradient information needed, ability to bypass local optima, and versatility in power system applications. Results. The simulation results of both test systems confirm the robustness and efficiency of the chaotic logistic grey wolf optimization algorithm compared to the rest of the algorithms in terms of convergence to the global optimal solution and in terms of providing the best and minimum multi-objective functions-based power losses, voltage deviation and relay operation time values. Practical significance. Recommendations have been developed for the use of optimal allocation of hybrid systems for practical industrial distribution power systems with the renewable energy sources presence.
EXPERIMENTAL INVESTIGATION OF SURFACE TOPOGRAPHY OF AL7075-T6 ALLOY MACHINED BY EDM
Authors: Balanou Maria , Papazoglou Lazaros-Emmanouil , Markopoulos Angelos P. , Karmiris-Obratański Panagiotis
Published: June 2021

Electrical discharge machining is one of the most important non-conventional machining processes for removing material from electrically conductive materials by the use of controlled electric discharges. EDM is a non-contact machining process, therefore, is free from mechanical stresses. This paper investigates the machining Al7075-T6 alloy by EDM using a copper electrode. Al7075-T6 alloy was selected, because of its growing use in a lot of engineering applications. The effect of electrical parameters, peak current and pulse-on time, on the surface integrity, was studied. Area surface roughness parameters (arithmetical mean height, Sa, and maximum height, Sz) were measured on all samples and 3D surface characterization has been carried out with confocal laser scanning microscopy. The experimental results showed that the surface roughness is mainly affected by the pulse-on time.
SIMULATION OF THE MACHINED SURFACE AFTER END MILLING WITH SELF-OSCILLATIONS
Authors: Dyadya Sergei , Kozlova Yelena , Germashev Anton , Logominov Viktor
Published: June 2021

Thin-walled parts are widely used in the aviation industry. It is mainly carried out with end mills and is accompanied by self-oscillation during rough milling. They negatively affect the quality of the machined surface. Therefore, it is important to model it taking into account the dynamics of the milling process to predict the accuracy. In the early works of the authors, the mechanism of the profile forming of the machined surface was determined. In this case, the identity of the shape of the cutting surface and the oscillogram of part’s oscillations during milling is taken as a basis. The first wave of self-oscillations takes part in the shaping of the machined surface during cut-up milling with self-oscillation, and during cut-down milling - the last wave. The change in the distances of the cut depressions to the position of the elastic equilibrium of the part is periodically repeated from the maximum value to the minimum. Based on this, when modeling the waviness pitch of the machined surface after cut-up milling, it is necessary to know the feed rate and how many cuts were made by the tool from the largest to the smallest depression. When modeling the machined surface after cut-down milling, you need to know the length of the cutting surface. It is calculated based on cutting speed and cutting time. The formula for determining the waviness pitch after cut-down milling is derived taking into account the tool feed. The waviness height of the machined surface after cut-up and cut-down milling is determined as the difference between the largest and smallest depressions. To determine the size of the pitch and the height of the waviness, formulas are derived for converting electrical and time values of oscillograms into linear ones. These formulas also allow you to determine areas of the oscillogram with oscillations of the part during cutting and the resulting surface areas on the profilogram. The methods for modeling machined surfaces were tested after cut-up and cut-down milling with self-oscillation. In this case, the pitch and height of the waviness on the profilograms were compared with those calculated from the results of measurements of the oscillograms. Based on their analysis, refined formulas for calculating the waviness height have been derived. The error between the measurements of the waviness pitch and height and the calculated values is within 6%.
TRIBOLOGY AND TOPOGRAPHY OF HARD MACHINED SURFACES
Authors: Molnár Viktor
Published: June 2021

In machining automotive industrial parts by hard machining procedures, the topographic characteristics of high accuracy surfaces have high importance. In this paper 2D and 3D surface roughness features of gear bores machined by hard turning and grinding are demonstrated. The 3D roughness parameters, which are considered as more exact than the 2D parameters, were compared to the 2D ones, which are used more widely in industrial practice. The analyzed machining procedure versions were ranked based on the topographic parameters determining the tribological (wear and oil-retention capability) characteristics of the different surfaces.
ESTIMATION OF ACCURACY OF COORDINATED SMALL DIAMETER HOLES WITH CUTTING TOOL DIRECTION
Authors: Burdeina Vyktoryia , Hrinchenko Hanna , Artiukh Svitlana , Trishch Andrii
Published: June 2021

The dimensional analysis of the initial parameters of the coordinated dimensions of the holes is presented. Issues related to the assessment of the accuracy of the location of the surfaces of deep holes are considered. The influence of various technological factors on the magnitude of scattering of coordinated dimensions is studied. Experimental studies using experimental design methodology, which was used for sample preparations 45 steel, cast iron SCH15, aluminum alloys. Factors such as the cutting angle, the hardness of the workpiece, the cutting force and their effect on the diameter of the impression and its depth were studied. As a result of the experiments, a slight effect of the drilling force on the diameter and depth of the impression was found. However, it was found that the angle of the core leads to a directly proportional increase in the diameter of the imprint and inversely affects its depth. The hardness of the material has a more significant effect on the diameter of the imprint than on its depth. The total influence of controlled factors significantly affects the diameter of the imprint. Minimum core drilling angles are proposed for some materials. A mathematical model of the accuracy of machining coordinated holes is proposed on the basis of estimating the coefficients of the regression equation and finding the required mathematical models of the scattering fields of dimensions and deviations. As factors that vary during the drilling of coordinated holes, were taken: the length of the conductor sleeve, the departure of the tool, the hardness of the workpiece, the diameter of the tool. It is found that with increasing tool diameter and guide sleeve length decreases the amount of dimensional scattering from the base and positional deviations, and increasing tool departure and improving the physical and mechanical properties of the workpiece increase the size of the size scattering field from the base and positional deviation. An additional factor was introduced: the gap in the combination between the cutting tool and the conductor sleeve and obtained mathematical dependences of the influence of factors on dimensional accuracy when machining deep holes with the direction of the cutting tool. It is shown that the introduction of an additional factor - the gap, did not change the essence of the process of errors on small aggregate machines, and the change in diameters does not lead to a significant increase in scattering fields.
CONTOUR METHOD FOR POSITIONING OBJECTS IN MOBILE COMPUTER VISION SYSTEMS
Authors: Kondratyev Sergey , Kostenko Vitaliy , Yadrova Marina
Published: June 2021

The paper considers the possibility of solving the problem of improving the quality of technical vision using the contour method, which is used to position objects in mobile computer vision systems. The hardware part of the object positioning system includes two video cameras, a Raspberry Pi 3 microcomputer, a depth contour map screen, and a motor control unit. The codes of programs based on the OpenCV library, the algorithm of the system and examples of the implementation of the contour method are given. The algorithm of the developed positioning technique includes the selection of the contours of objects on the frames of a stereopair, removal of all open contours, calculation of the moment (center of mass) of each closed contour, determination of the displacement along the x-axis of the moments of the corresponding contours, filling each closed contour with points with a brightness inversely proportional to the displacement of the moments. The presence of two video cameras, a Raspberry Pi 3 microcomputer, a contour depth map screen provides stereoscopic and panoramic "vision", that is, the ability to determine the presence of objects and their distance, as well as to get an overall picture in the "field of view" of the system. The engine control unit allows mobile devices to avoid obstacles. Based on the analysis of the research results, it was found that the proposed system provides an increase in the quality of positioning of objects and a decrease in the required computing resource, which gives a significant decrease in power consumption and ensures the autonomy of the system.
CRITERIA OF ACTUALITY OF EQUIPMENT IN SOLVING OF THE PROBLEM OF COMPLETING OF EMERGENCY AND RESCUE EQUIPMENT IN THE CONDITIONS OF UNCERTAINTY
Authors: Kryshtal Vasyl , Snytyuk Vitaliy , Fedorenko Dmytro
Published: June 2021

The problem of rescue equipment compilation was analyzed, which showed such features as the existing limited financial resources, a significant increase in the capacity of the element base, decision making processes based solely on the experience and intuition of those responsible person was carried out. It is shown that the previously proposed solutions were based on the cost of equipment, its reliability, functionality and capacity, while the aspect of its applicability or relevance was ignored. Taken into account the significant number of potential elements of equipment that may be included in the kit, limitations that will reduce the number of possible variants based on the method of sequential analysis of variants are proposed. It is proposed to determine the priority of equipment elements of a certain class using the method of analytic hierarchy process on the prioritization of criteria and procedures for determining the competence of experts. Since the task of compilation is multi-criteria, it is proposed to include the criterion of relevance in the criteria for determining the optimal kit. Models of equipment relevance indicators are constructed, as well as the relevance rate of the equipment element is determined and a model to determine the relevance rate of the set of emergency rescue equipment for a certain emergency situation is developed. It is proposed to calculate the total relevance rate of the equipment set for all emergencies as the average value of the relevance rate of the kit for each emergency, provided they are equivalent, or as a weighted value otherwise. Numerical modeling based on the developed algorithm allowed to draw conclusions about the relevance and, as a consequence, the priority of equipment elements, as well as to assess the degree of provision of rescue unit with rescue equipment in various emergencies
INTEGRATION OF MODERN TECHNOLOGY FOR ARCHITECTURAL-BUILDING GLASS PRODUCTION
Authors: Bragina Liudmyla , Yaitsky Serhiy , Petrov Dmytro , Starolat Olena
Published: June 2021

The current state of technologies for the production of glass products used in the architectural and construction industry, types of the energy-saving float-glasses and their role in the lighting quality of the buildings was analyzed. The relevance of the use of Low-E glass, in particular in the glass units, is shown. Innovative trends in the production of sheet architectural and construction float glass with the use of modern technologies and equipment, in particular, at PJSC "Lysychansk glass factory "Proletary ", considered. It is established that a significant disadvantage of more energy-efficient I-glasses, which have a wide range of color characteristics, is the insufficient mechanical strength of soft coatings applied by magnetron vacuum spraying. It is shown that the technology of manufacturing low-emission I-glasses with such coatings does not allow them to be hardened while maintaining all the necessary operating parameters. Physicochemical properties and operational characteristics of large-sized glasses with silver, sunscreen soft coating, laminated, flat and radial tempered glasses, as well as their areas of application are presented. The principles of strengthening soft magnetron coatings for low-emission Double Low-E glasses and composition, layer combinations and technological parameters of multilayer nanocoatings with a total thickness of up to 140 nm, which allows to harden I-glass with these coatings, investigated. The technological parameters of obtaining low-emission I-glasses with variable coatings, which regulate the spectral and operational indicators of these glassware according to the interstate standards GOST EN 673-2016 and GOST EN 410-2014, are analyzed. Technological methods of the sheet glass with low-emission coatings hardening by creating of the special compositions and optimizing magnetron sputtering processes optimizing, as well as the basic regularities of the arrangement of the film layers of the Si3N4 / NiCr / Si3N4 film for the heat treatment withstanding of the glasses in the R2O – RO – SiO2 system are considered. The principles of adjusting their spectral and mechanical characteristics depending on the concentration and ratio of the components of the thin-film nanolayer, which will contribute to the creation of a variation series of float glasses with the required level of reflection in the infrared spectrum, are proposed.
PROCESSING AND RECYCLING OF PHOTOVOLTAIC SOLAR PANELS
Authors: Samoilenko Nataliia , Katenin Vadym , Baranova Antonina
Published: June 2021

The steady tendency of increasing the installed capacity of solar power plants, which is accompanied by the gradual accumulation of solar panel waste, is analyzed. The main factors of negative impact on the environment and directly on human health from the production of solar photovoltaic panels and waste of these panels are identified. The scenarios of solar photovoltaic panels waste accumulation are analyzed, the specifics of waste generation and accumulation in the present and in the future are characterized. Taking into account the average service life of solar photovoltaic panels in 25 years, it is determined that the amount of waste will increase significantly in the period of 2030…2035, reaching a peak between 2040 and 2050. The type and composition of photovoltaic panels, which determine the essence of waste processing technology, are characterized. It is defined that today most research on waste recycling of solar photovoltaic panels focuses on the first generation of modules, which is associated with the scale of operation of these panels and sales markets. It was found that at present, the production of solar photovoltaic panels, which consumes primary natural materials, is characterized by nature intensity, and direct waste processing cannot meet the needs of the photovoltaic modules production. The objective necessity of carrying out large-scale extraction of minerals and use of precious metals before the period of highly efficient processing of waste solar photovoltaic panels, which would meet the demands of production, is substantiated. Modern tendencies in technological researches and developments of secondary processing of photovoltaic modules are considered. It is determined that as the volume of solar photovoltaic panels production and waste generation increases, the requirements for ensuring the environmental efficiency of waste processing and disposal technologies should be more stringent. This involves increasing the recycling degree of the waste’s main components, starting from 80…90 % and to the highest possible level. It is determined that at the same time with this tendency, it is expedient to develop technologies for recycling of non-recyclable parts of waste at present.
Use of electromechanical analogies in the construction and calculation of a simulation model of the process of torsional oscillations of the shaft line of an internal combustion engine
Authors: Kononov Volodymyr , Kononova Olena , Musairova Yulia
Published: June 2021

The purpose of the article is to substantiate the possibility of using electromechanical analogies in the construction and calculation of parameters of the simulation model of the process of torsional oscillations of the internal combustion engine shaft, which will allow to move from mechanical models of shafts to their electrical counterparts. Results of the research. The article clarifies the relationship between phenomena occurring in mechanical and electrical systems, mechanical and electrical analogues are established, namely force is considered as electromotive force or voltage, velocity as current, moment of inertia as inductance, spring flexibility as capacitance, coefficient friction as electrical resistance, and the kinematic scheme of the shaft line is presented in the form of a diagram of a reactive bipolar, the parameters of which are determined during analytical calculations of the kinematic scheme of the elastic system. The concept of dynamic stiffness is introduced, which is similar to the concept of reactive resistance of a bipolar. The initial data for the calculation of a linear system in which it is assumed that the pliability of the shock absorber is zero. Conclusions. According to the results of the analogies, the parameters of the simulation model were obtained. The calculation of the elastic system using the method of electromechanical analogies allowed to build a simulation model of the shaft line of an internal combustion engine.
Functional stability of technological processes based on nonlinear dynamics with the application of neural networks
Authors: Sobchuk Valentyn , Zamrii Iryna , Olimpiyeva Yuliya , Laptiev Serhii
Published: June 2021

The processes of transformation of global information infrastructure and large-scale automation of production lead to the actual merger of automated production, data exchange and production technologies into a single self-regulatory system with minimal or no human intervention in the production process. Currently, there is a mass introduction of cyberphysical systems into production with the simultaneous application of the results obtained in the fields of artificial intelligence, robotics, the Internet of Things and so on. Implementing the goal of developing methods for organizing production processes of metal processing at machine-building enterprises using neural networks, the processes of global transformation of IT infrastructure were studied against the background of mass introduction of cyberphysical systems and breakthroughs in artificial intelligence and technological processes. The characteristics of the behavior of complex technical systems that implement the property of functional stability of such systems are studied. The processes of metal processing by cutting are characterized taking into account the peculiarities of the influence of deformation hardening, plastic deformations, self-oscillations and chaotic dynamics that occur in machining centers. Methods of application of neural networks in modeling of processes of mechanical processing of metals by cutting are described. A universal technique for constructing neural network models of the machining process on the basis of an artificial counter-propagation neural network is given. Based on the analysis, an intelligent system of analysis and forecasting of the dynamic stability of the technological process of cutting using parallel calculations, which guarantees the fulfillment of the necessary conditions to ensure the functional stability of the production process.
EXPERIMENTAL DETERMINATION OF THE LEVEL OF INCIPIENT TURBULENCE IN THE WORKING PART OF THE T-1 WIND TUNNEL OF IVAN KOZHEDUB KHARKIV NATIONAL AIR FORCE UNIVERSITY
Authors: Бездєльний Віталій , Шевченко Сергій , Грідасов Ілля
Published: June 2021

The subject of the article is to determine the level of incipient turbulence in the wind tunnel T-1 which is based on the method of measuring the pressure drop. The purpose is to experimentally determine the level of incipient turbulence in the working part of wind tunnel T-1 of Ivan Kozhedub Kharkiv National Air Force University in preparation for aerodynamic testing of aircraft models. Research methods: the method of pressure drop on the surface of the sphere by drainage. The following results of experimental determination of the level of incipient turbulence in the wind tunnel T-1 were obtained. It is established that the wind tunnel T-1 has a level of incipient turbulence 0,5…0,9 %, which corresponds to the normal condition for further experimental studies. Conclusions. According to the results of studies of the incipient turbulence in the wind tunnel T-1 by the method of pressure drop, the main dependences are obtained, and the incipient turbulence of the flow for the wooden sphere x = 0,9 %, and for the metal sphere x = 0,5 %, is determined. Determining the pressure distribution and aerodynamic drag does not involve measures to balance the aerodynamic scales and their certification, which determines the necessary role in the obtained reliable results of the experimental study, and this favors the drainage method.
Comparative analysis of the organization of cloud infrastructure
Authors: Kovalenko Andriy , Liashenko Oleksii , Yaroshevych Roman
Published: June 2021

Most technology experts consider cloud computing to be one of the most influential IT trends of the twenty-first century. Over the past two decades, cloud computing has made significant changes in the IT industry, and most organizations now use the cloud-first approach in their technology needs. The cloud platform is a set of services and credentials provided by developers. They provide users with access to computing resources and analytics tools, as well as data warehouses, servers, software, etc., for regular users and large companies. Cloud computing is a new model of providing and using a variety of IT resources, including computing power (servers), storage space, network bandwidth and applications. Resources in this model are pooled and provided on demand, and payment is made for actual use. The model itself is highly adaptable and has excellent network access capabilities. Cloud computing has many advantages over traditional enterprise infrastructure solutions, offering services and services, and more. Such advantages include: flexibility, scalability, payment for actual use, high reliability, and failover. Cloud computing can significantly improve the availability of IT resources and provide many advantages over other computing methods. For example, they can provide access to services without interacting with service providers. And all the resources on the cloud are available to any user, ie users can dynamically rent physical or virtual resources and do not need to know their origin or place of residence. In addition, all resources on the cloud computing platform can be deployed quickly and without stopping.
Determining the capacity of the self-healing network segment
Authors: Kuchuk Nina , Shefer Oleksandr , Cherneva Galina , Alnaeri Frhat Ali
Published: June 2021

An approach to determining the bandwidth of the self-healing segment of the data network is proposed. The subject of the study are autonomous segments of the telecommunications network, which have the property of self-healing. The object of research is the process of information transfer between nodes of an autonomous segment. The scientific novelty is to improve the method of determining the capacity of the self-healing segment of the telecommunications network with limited network resources by applying the criterion of ensuring the minimum time of information delivery at a given limit of possible probability of loss. The following tasks were solved: a mathematical model of the self-healing segment of the telecommunication network in the form of a queuing system was developed; the proposed method of calculating the degree of channel congestion. Conclusion: the proposed approach made it possible to calculate the bandwidth of the communication channels of the self-healing segment of the telecommunications network and the required amount of buffer memory with a known network topology and a given gravity matrix, providing the required values of failure probability and guarantee minimum message delivery time.
DEVELOPMENT OF PROCEDURES FOR MODIFYING THE CIPHER GOST 28147
Authors: Євсєєв Сергій , Корольов Роман , Ткачов Андрій , Німченко Анастасія
Published: June 2021

The entry of mankind into the era of high technologies, the rapid growth of computer technology contributes to the expansion of the range of electronic services. To ensure the security of confidential information, personal data, cryptographic systems of traditional cryptography (symmetric cryptosystems) and public key cryptography (asymmetric cryptosystems) are used. As a rule, the former provides security services, the latter provide key distribution. However, in the conditions of totalitarian surveillance in society by the special services of developed countries, cryptographic tabs are embedded in cryptographic algorithms, which, on the one hand, provide “quick” access for special services to confidential information, and on the other hand, allow intruders to break into the cryptosystem and obtain user data. The article proposes a modification of the well-known GOST 28147-89 algorithm, which ensures the "elimination" of possible crypto-bookmarks and an increase in crypto-resistance in the post-quantum period (the emergence of a full-scale quantum computer that allows hacking modern symmetric and asymmetric cryptosystems based on Grover and Shor algorithms). It is proposed to use the procedures for modifying the block-symmetric encryption algorithm (BSEA) GOST 28147-89 (2009, 2015) in OFB mode, which will make it possible to form a pseudo-random sequence based on dynamic changes in the S-box, and provide the required level of security.
A physics-informed neural network for sound propagation in the atmospheric boundary layer
Authors: Pettit Chris , Wilson D.
Published: June 2021

We describe what we believe is the first effort to develop a physics-informed neural network (PINN) to predict sound propagation through the atmospheric boundary layer. PINN is a recent innovation in the application of deep learning to simulate physics. The motivation is to combine the strengths of data-driven models and physics models, thereby producing a regularized surrogate model using less data than a purely data-driven model. In a PINN, the data-driven loss function is augmented with penalty terms for deviations from the underlying physics, e.g., a governing equation or a boundary condition. Training data are obtained from Crank-Nicholson solutions of the parabolic equation with homogeneous ground impedance and Monin-Obukhov similarity theory for the effective sound speed in the moving atmosphere. Training data are random samples from an ensemble of solutions for combinations of parameters governing the impedance and the effective sound speed. PINN output is processed to produce realizations of transmission loss that look much like the Crank-Nicholson solutions. We describe the framework for implementing PINN for outdoor sound, and we outline practical matters related to network architecture, the size of the training set, the physics-informed loss function, and challenge of managing the spatial complexity of the complex pressure.
The KALKOWSKY Project - Chapter I. Ooid - stromatoid relationship in a stromatolite from the Maiz Gordo Fm (Argentina)
Authors:   Carnets de Géologie, Granier Bruno , Lapointe Philippe
Published: June 2021

The comparative study of oolites and stromatolites demonstrates striking similarities between KALKOWSKY's German Triassic material (drawn from the scientific literature) and our Argentinian Paleogene material. However, the latter better illustrates that ooids and stromatoids, hence oolites and stromatolites, which share the same dual (i.e., organic and mineral) nature, are merely the end-members of a continuum of microbial carbonate structures.
Resenha da obra Metodologias visuais em Ciências Sociais e da Educação de Manuel Jacinto Sarmento
Authors: Martini Daniele
Published: June 2021

A obra Metodologias visuais em Ciências Sociais e da Educação aborda o uso de imagens como forma de produzir conhecimento. Nesse sentido, o autor Manuel Jacinto Sarmento evidencia as modalidades de utilização das imagens na investigação em ciências da educação, como utilização de pinturas, gravuras, caricaturas e fotografias como exemplos documentais de fatos históricos ou de práticas educacionais e recurso às imagens históricas como fonte primárias. Os paradigmas teórico-metodológicos de aplicação dos métodos visuais são abordados como sendo positivista, interpretativo e crítico-participativo. O autor apresenta os aspectos estruturantes dos procedimentos com o uso das metodologias visuais como o planejamento, trabalho de campo, análise e interpretação e escrita e apresentação do relatório de investigação, os quais devem seguir o rigor epistemológico concernente à investigação científica. Utilizar as metodologias visuais requer do pesquisador capacidade científica, qualidade técnica na produção de imagens, ética e respeito pelos princípios além da sensibilidade interpretativa Tal metodologia apresenta-se, além da pesquisa, como uma possibilidade de aplicação nas práticas pedagógicas.
Relato de experiência na educação básica em tempos de pandemia: As dificuldades de aprendizagem observadas no estágio supervisionado do nível fundamental
Authors: Ferreira Marcos , Rosa Pedro Augusto Lopes Rosa , Costa Bruno Sebastião Rodrigues da Costa
Published: June 2021

Com este artigo objetivamos apresentar a experiência dos discentes do curso de Licenciatura em Matemática da Universidade Estadual do Pará (UEPA), na disciplina Prática de Ensino de Matemática I, conhecida em alguns cursos de nível superior como Estágio Supervisionado, o qual foi realizado no período de setembro à dezembro de 2020. Em razão da pandemia causada pela Covid-19, as escolas da rede pública e privada de ensino do estado do Pará, funcionaram de forma não presencial e hibridas. Sendo assim, as fases de observação e regência ocorreram fora do ambiente escolar, com três alunas, sendo duas da rede pública e uma da rede privada de ensino. Para tal intervenção, buscamos por meio de jogos lúdicos estimular o aprendizado das discentes, com o intuito de contribuir com o processo de Ensino e Aprendizagem. Com isso, concluímos que os resultados foram satisfatórios, visto que as alunas apresentaram bom desempenho mediante as instruções e a intervenção pedagógica. Portanto foi uma experiência gratificante, ao mesmo tempo complexa e desafiadora em razão dos limites, possibilidades e dificuldades no percurso, o qual estamos vivenciando nesta nova realidade de adaptações tanto para aluno quanto para professores em aproximar a essa nova realidade tentando favorecer o processo de Ensino e Aprendizagem.
Cultura Afro-brasileira e Consciência Negra
Authors: Santos Rebeka , Lima Janiara , Arquino Wellen
Published: June 2021

O vigente artigo apresenta e discute resultados de uma intervenção pedagógica realizada por meio do Programa de Residência Pedagógica vinculado ao Curso de Licenciatura em Geografia da Universidade Federal de Pernambuco (UFPE), numa série do 7º ano do Ensino Fundamental da Escola Municipal São Cristóvão. Apoiando-se na Lei 10.639, que estabelece o 20 de novembro como o Dia Nacional da Consciência Negra e a obrigatoriedade do ensino da história e cultura Africana e Afro-brasileira, a intervenção teve como objetivo principal abordar a temática da Cultura Afro-brasileira e a Consciência Negra de forma lúdica, a fim de desmistificar e fortalecer o repertório sociocultural dos estudantes. Utilizando o lúdico como elemento facilitador no ensino da Geografia e dessa temática transversal, no contexto das aulas remotas devido a pandemia, buscou-se engajar os estudantes a aprender de forma ativa. Nesse cenário, empregou-se recursos visuais em slides, no primeiro momento, de forma expositiva e dialogada. E em seguida, utilizou-se a plataforma onlineWordwall, que viabilizou a integração entre conteúdos e a interatividade, a partir de um jogo, entre os sujeitos envolvidos.
Cell culture-based enrichment of mouse hematopoietic stem and progenitor cells﻿
Authors: Ochi Kiyosumi , Morita Maiko , Wilkinson Adam C. , Iwama Atsushi , Yamazaki Satoshi
Published: June 2021

Bone marrow (BM) chimeric mice are a valuable tool in the field of immunology and hematology, and genetic manipulation of donor cells is widely used to study gene function under physiological and pathological settings. Current BM chimera protocols generally require use of multicolor fluorescence-activated cell sorting (FACS) for donor hematopoietic stem and progenitor cell (HSPC) purification. Here, we describe a cell culture technique for the enrichment of functional HSPCs from mouse BM without the use of FACS purification. This technique is therefore expected to overcome current limitations in mouse BM chimera models.
Association Between Maternal Exposure to Indoor Air Pollution and Offspring Congenital Heart Disease: A Multi-Hospital Case-Control Study in East China
Authors: Sun Jing , Wang Jian , Yang Jing , Shi Xin , Li Shujing , Cheng Jinping , Chen Sun , Sun Kun , Wu Yurong
Published: June 2021

Background
Previous research has suggested an association between maternal exposure to ambient air pollutants and the risk of congenital heart defects (CHDs). However, the effect of individual prenatal exposure to indoor air pollutants on CHD occurrence has not been reported.
Methods
We carried out a hospital-based case-control study to investigate the association between personal air pollution exposure during pregnancy and the risk of CHDs in offspring. A total of 34 cases and 72 controls were included in this study from two hospitals in East China. We investigated maternal and residential environmental characteristics using a questionnaire and obtained personal indoor air samples to assess particulate matter (PM) and volatile organic compounds (VOCs) from 22–30 gestational weeks; formaldehyde, benzene, toluene, xylene, total VOCs (TVOCs), PM10, and PM2.5 were assessed. Logistic regression was performed to assess associations and interactions among individual indoor air pollutants and CHDs after adjusting for confounders. The potential residential environmental factors affecting the risks of indoor air pollutants on CHDs were also assessed.
Results
Median TVOC (0.430 vs. 0.005 mg/m3, P < 0.001), PM2.5 (12.00 vs. 8.00 µg/m3, P = 0.037) and PM10 (13.50 vs. 8.00 µg/m3, P = 0.028) exposure levels in cases were significantly higher than those in controls. In a regression model adjusted for confounders, exposure to high levels of indoor TVOCs, PM2.5 and PM10 during pregnancy was associated with risks for CHDs and the occurrence of some major CHD subtypes in offspring. These risk effects were enhanced among pregnant woman living in a newly renovated house or near heavy-traffic roads but were mitigated by household usage of smoke ventilators when cooking. We observed a positive interaction of maternal exposure to TVOCs and PM2.5 in regard to the risk for CHDs.
Conclusions
Maternal exposure to indoor VOCs and PMs may increase the risk of giving birth to foetuses with CHDs.
Non-Inferiority Test for a Continuous Variable with a Flexible Margin in an Active Controlled Trial : An Application to the "Stratall ANRS 12110 / ESTHER" Trial
Authors: Sandie Arsene , Molinari Nicholas , Wanjoya Anthony , Kouanfack Charles , Laurent Christian , Tchatchueng-Mbougua Jules Brice
Published: June 2021

Background : The non-inferiority trials are becoming increasingly popular in public health and clinical research. The choice of the non-inferiority margin is the cornerstone of the non-inferiority trial. When the effect of active control intervention is unknown, it can be interesting to choose the non-inferiority margin as a function of the active control intervention effect. In this case, the uncertainty surrounding the non-inferiority margin should be accounted for in statistical tests. In this work, we explored how to perform the non-inferiority test with a flexible margin for continuous endpoint.Methods: It was proposed in this study two procedures for the non-inferiority test with a flexible margin for the continuous endpoint. The proposed test procedures are based on test statistic and confidence interval approach. Simulations have been used to assess the performances and properties of the proposed test procedures. An application was done on clinical real data, which the purpose was to assess the efficacy of clinical monitoring alone versus laboratory and clinical monitoring in HIV-infected adult patients.Results : Basically, the two proposed test procedures have good properties. In the test based on a statistic, the actual type 1 error rate estimate is approximatively equal to the nominal value. It has been found that the confidence interval level determines approximately the level of significance. The $80\%$ , $90\%$ , and $95\%$ one-sided confidence interval levels led approximately to a type I error of $10\%$ , $5\%$ and $2.5\%$ respectively. The power estimate was almost $100\%$ for two proposed tests, except for the small scale values of the reference treatment where the power was relatively low when the sample sizes were small.Conclusions : Based on type I error rate and power estimates, the proposed non-inferiority hypothesis test procedures have good performance and are applicable in practice.Trial registration : The trial data used in this study was from the "Stratall ANRS 12110 / ESTHER", registered with ClinicalTrials.gov, number NCT00301561. Date : March 13, 2006, url : https://clinicaltrials.gov/ct2/show/NCT00301561.