bluuebunny/crossref_metadata_2025 huggingface dataset:
Motyw zarazy w „Guwernantce” Vladimíra Macury
Authors: Żygadło-Czopnik Dorota
Published: December 2022

The main goal of this article is a recreation of the dramatic events in Prussian Wrocław in the 1840s during the cholera epidemic in Vladimir Macura’s novel The Governess. The Czech writer’s work is not only a short history of the epidemic in Wrocław but also a psychological study of the community in the face of the threat. The chronological framework of these considerations are the years 1845–1852. During this period, poet, university teacher, and widower František Ladislav Čelakovský married Antonia (née Reiss) in Prague. Soon after the wedding, the married couple arrive in Prussian Wrocław, which will soom be overcome by the plague. The disease is a unique situation in the life of both Antonia and František and the inhabitants of Wrocław, a borderline of sorts. In Macura’s literary world, the plague functions as a metaphor for an identity crisis and, simultaneously, as a means of overcoming it, becoming a stimulus for introspection, and thus for better recognition of one’s place in the world. He accompanies the Čelakovskis during family crises, disasters and historical turning points described in the article. It is a sign of the end of a particular world accompanied by “the great dying.”
O genetski izazvanim bolestima u romanu „Kralj Bola i skakavac” (Król Bólu i pasikonik) Jaceka Dukaja
Authors: Ajdačić Dejan
Published: December 2022

The author discusses the historical changes in attitudes towards infectious diseases in the mythological, Christian-religious and scientific worldview before and after the discovery of the causes of these diseases in the context of the types of futuristic fiction. One narrative line of the novel by contemporary Polish writer Jacek Dukaj King of Pain and the Grasshopper (Król Bólu i pasikonik, 2010) is centred on to the production of retroviruses and carcinogenic agents by genetic engineering companies that cause epidemics and destroy wildlife in the southern hemisphere. The text points out the specifics of the author’s descriptions of the cause of the plague and discusses Dukaj’s speculative projections of futuristic fiction.
Obraz zarazy w poezji Dmitrija Chwostowa
Authors: Warda Anna
Published: December 2022

The subject of the article is the image of the plague (specifically — cholera) that struck Russia in 1830, which was presented in two poems by a graphomaniac poet — Dmitry Khvostov (1757–1835). The aim of the research is to discuss in detail the poetic image of the epidemic in the poems Cholera of 1830 and July in Petropolis. The poetic portayal of the cholera epidemic in two of Russia’s largest metropolises focuses not only on the plague’s daunting form and effect, but also on strategies of combating it. The article uses descriptive, biographical, analytical, comparative and intertextual methods of research, which led to the conclusion that the method of imaging used by Khvostov was typical for the era of classicism and the literary tradition of M. Lomonosov, but in terms of originality and poetic artistry, it did not show any greater value. Khvostov identified plague with evil and unclean forces, and presented the fight against it as an expression of the highest bravery. The poetic descriptions of the plague are accompanied by passages typical of panegyric poetry praising the tsar and his actions taken during the pandemic.
Епидемија бесмртности и писање романа у „Проналаску Атханатика” Владана Деснице
Authors: Filipov Sofija
Published: December 2022

In Vladan Desnica’s unfinished novel, The Discovery of Athanatic, “contagion” is presented in a very specific way. Unlike any epidemic that equates people through dangerous experiences, Desnica’s unfinished novel erupts an “epidemic of immortality” that opens up the deepest inequality: inequality before death. Desnica’s novel is not only one of the first dystopian novels in Serbian literature of the 20th century, but it is also a novel about writing a novel, which suppresses the very theme of immortality. Death appears on the horizon of writing and the question arises whether it is possible to write without death at all, which is of supreme importance for the poetics of high modernism. In specific borderline situations, the modernist subject turns to himself and searches for meaning and ultimate truth, which gives Desnica’s unfinished novel, of which an important part has been included in his major novel, The Springtimes of Ivan Galeb, poetic significance. The “contagion” would not have the same literary relevance without it.
Эпидемия как тест смысла жизни в повести Викентия Викентьевича Вересаева „Без дороги”
Authors: Dohnal Josef
Published: December 2022

The article discusses the thematic core of V.V. Veresaev’s novel Without a Road (Без дороги, 1894). A detailed analysis of the prose lead the author to believe that the depiction of the epidemic in the protagonist‘s diary has become a catalyst for Veresayev’s own views. The way in which the character perceives the epidemic and the aid for the sick focuses on the rudeness, passivity, mistrust displayed by “the people” towards “the intelligentsia.” The “people’s” aggressive resistance to the protagonist leads him to a mental crisis and, ultimately, death. The depiction of the course of the epidemic revealed the inadequacy of Narodnik notions of the unilateral responsibility of the intelligentsia for the ignorance and misery of “people.” The protagonist of this prose can thus be considered a specific subtype of the so-called superfluous man; although he himself is active, he is doomed to failure not only through his own fault (accepting an unviable ideological premise), but to a far greater extent through the fault of those who are unwilling to accept his help and who have punished him for his altruistic activity.
The English Plural Linguists Have Forgotten, but Speakers Have Not
Authors: Berezowski Leszek
Published: December 2022

The late professor Jan Cygan, to whose memory this volume is dedicated, was fond of showing that many quirks of modern English usage are in fact vestiges of earlier stages in the history of the language. He cherished using historical data to elucidate such puzzling cases, and this paper follows in his footsteps by investigating a minor English zero plural pattern that featured quite prominently in discussions of Boris Johnson’s legacy as mayor of London, e.g.: “Three secondhand water cannon bought and refurbished for £322000 during Boris Johnson’s time as mayor of London have been sold for £11025” (Devlin). In order to account for such usages, this paper reviews extant research on animal zero plurals and extends the explanation argued for in Berezowski to inanimate instances. It is shown that in both scenarios, the use of the zero plural is conditioned by a cognitive factor rooted in human perception. Specifically, it is claimed that inanimate zero plurals are holdovers from the times when early military tactics and technology prevented speakers from individuating the referents of a handful of English nouns.
Antagonizmy narodowościowe II RP a bezpieczeństwo państwa — kazus ukraiński w Małopolsce Wschodniej. Przyczynek do dyskusji
Authors: Landmann Tomasz
Published: December 2022

The aim of this article is to identify and characterize selected sources of national antagonisms of the Second Polish Republic through Ukrainian activities in Eastern Lesser Poland. The considerations are based on archival material and critical analysis of scientific literature.

A thesis was put forward that the actions taken to materialize the Ukrainian case and interests in Eastern Lesser Poland were a source of national antagonisms in the Second Polish Republic and one of the factors weakening the security of the Polish state.

The presented arguments show that the so-called Ukrainian case in Eastern Lesser Poland was connected to the security of the Second Polish Republic, and the Ukrainian actions in this region, unfavourable towards Poland, weakened Poland’s security. The actions taken by the Ukrainians were a source of national antagonisms in Poland in the interwar period. Nationalism, terrorism, neglect of duties related to military service, anti-Polish propaganda and defamation of Poland in the Ukrainian press and diplomacy in the international arena, threatened Poland’s security in relation to the development of the sociopolitical situation in Eastern Lesser Poland.
Determinants of Business Performance of Pottery Artisans in Banyumulek Village, West Lombok, Indonesia
Authors: Awwalunnisa Nur , Hasanah Ulfatun
Published: December 2022

Purpose: This study aims to determine the factors that affect the business performance of pottery artisans in Banyumulek village, West Lombok Regency.  
Method: This is associative research employing the sample survey method. The population of the study is the members of Banyumulek Arts Market, as many as 94 artisans from which 48 members are taken samples based on Slovin Formula. Data is analyzed using multiple linear regression while the hypothesis is examined with T-test and F-test processed with SPSS 26.
Result: the authors found that the variables of entrepreneurial characteristics have a significant influence partially or simultaneously on the business performance of pottery artisans in Banyumulek Village. The Standardized Coefficient Beta value shows that the future-oriented variable is the most dominant in the business performance of pottery artisans in Banyumulek Village, West Lombok.
Contribution: Practically, this research is expected to be helpful for the development of entrepreneurs in West Nusa Tenggara Province, especially in improving the business performance of pottery artisans in Banyumulek Village.
Antibiotic Sensitivity Against Klebsiella spp. in the Post Debridement Culture an Open Fracture in Emergency Department of dr. Soebandi Hospital Jember
Authors: Agustina Dini , Cahyaningrum Endiningtyas , Komariah Cicih , Semita I Nyoman , Putra Yudha Ananta Khaerul
Published: December 2022

Surgical site infection (SSI) in open fracture is often caused by bacterial contamination in the management of open fracture. Because of that, one of the most important thing in handling open fracture is debridement. Prophylactic antibiotics given are Cephalosporin and Aminoglycosides. Post-debridement culture is important in predicting the incidence of infection. One of the bacteria that is often found in post-debridement culture is Klebsiella spp. which can produce ESBL to fight β-lactam class of antibiotics. The purpose of this study was to determine antibiotic sensitivity against Klebsiella spp. in the post-debridement culture of cases of open fractures in the emergency department of dr. Soebandi hospital Jember. This study uses a laboratory exploratory research design. The sample of this study was the isolate of Klebsiella spp. which amounts to 5 from post debridement culture of open fracture patients in the emergency department of dr. Soebandi hospital Jember from March to May 2019.The method used is diffusion (Kirby Baurer) by matching using the CLSI standard table to determine sensitive, intermediate, or resistant. The results of this study showed that most antibiotics had resistance to Klebsiella spp., including β-lactam antibiotics, such as Amoxicillin, Ceftriaxone, Cefixime, Penicilin, Meropenem, and Cefadroxil. Vancomycin antibiotics are still sensitive to Klebsiella spp. in all patients. Gentamicin, Ciprofloxacin, Tetracycline, and Chloramphenicol antibiotics were sensitive in 1 patient. Erythromycin intermediates antibiotics against Klebsiella spp.. The conclusion of this study is that all β-lactam group antibiotics are resistant to Klebsiella spp while the most sensitive antibiotic is Vancomycin.
Active Preservation at The Record Center of Padjadjaran University as a Steps to Extend The Life of The Archives
Authors: Windyani Aprilia  , Dr. Ute Lies Siti Khadijah  , Samson CMS  , Lutfi Khoerunnisa
Published: December 2022

Archives are important documents that function in administrative, legal, financial, organizational, historical, directive, and information functions in the realm of government. The importance of archives to be stored, preserved, and maintained is one of the reasons for writing this article. This paper describes the types of archives and the active preservation actions taken against conventional archives in the form of image sheet archives and photo archives carried out by the UPT Arsip (Record Center) Universitas Padjadjaran. This active preservation action is carried out as an effort to extend the life of archives or collections from archival institutions. The location of this research is at UPT Archives (Recording Center) Universitas Padjadjaran. This research was conducted by conducting direct observations at the UPT Archives (Record Center) Universitas Padjadjaran and conducting interviews. The research method was carried out using a qualitative descriptive method, namely by explaining the active preservation actions carried out by the UPT Archives (Recording Center) Universitas Padjadjaran. The actions taken by the UPT Arsip (Record Center) Universitas Padjadjaran are to maintain the temperature of the archives by coating the photos with tissue on each sheet and also cleaning the archives from dust. Files are also stored according to file type in roll o'packs, racks, or boxes to avoid damage to records due to dust. This article also discusses the lack of preservation efforts made by the UPT Archives (Record Center) Universitas Padjadjaran such as the amount of ventilation in the room which increases dust capacity.
The state and prospects of the development of vibration gyroscopy in Ukraine and in the world
Authors: Chikovani Valerii , Golovach Serhii
Published: December 2022

The work analyzes the development and current state of vibration gyroscopes in Ukraine and in the world. The development of quartz and metallic resonators of various diameters for vibrating gyroscopes is presented and analyzed. In addition, for comparison with world practice, the developments of quartz and metallic resonators of advanced foreign companies, leaders in this field, are given. The block diagrams of the standing wave control system of the vibrating gyroscope in three modes of operation: as  the angle rate sensor, as the rate-integrating or whole angle mode sensor and the differential mode are considered. In the perspective, the possibility of combining all three modes in one gyroscope with automatic switching from one mode to another one is shown, for maximum use of the advantages of each mode in dependence of environmental conditions and motion parameters. The test results of gyroscope with a metallic resonator made in Ukraine, on the effect of a wide range of external disturbances are presented. The development prospects of vibrating gyroscopes and systems based on them are evaluated. The paper draws conclusions about the state and prospects for the development of vibrating gyroscopy in Ukraine.
Mathematical model of instrumental vibration error of angular velocity sensor
Authors: Chernyak Mykola , Lesyuk Markiyan
Published: December 2022

The problem of mathematical description of the influence of harmful deterministic and broadband random vibrations of a moving object on the measurement result of the sensor of the angular velocity of rotation of this object installed on it is considered. It is shown that under such conditions a systematic instrumental vibration error arises in the angular velocity sensor. The source of this error is the nonlinearity of the static conversion function of the angular velocity sensor and the asymmetry of its conversion coefficient.

A mathematical model of this error has been obtained. Formulas for calculating the vibrational error of the angular velocity sensor are obtained depending on the apparent angular velocity of the flight of the aircraft, the vibration parameters of the base on which the sensor is installed and the parameters of the nonlinear sensor conversion function.

This model makes it possible to calculate the value of the vibration error under specified vibration conditions for a specific angular velocity sensor (direct analysis problem), as well as to select an angular velocity sensor based on the values ​​of its conversion function coefficients, based on ensuring the required accuracy of measuring the angular velocity of a moving object using this angular velocity sensor (inverse synthesis problem).
Synthesis of the moving object positioning system
Authors: Ryzhkov Lev , Palamarchuk Pavlo
Published: December 2022

The choice of structure and parameters of the positioning system of a moving object based on a complementary filter using GPS-receiver and accelerometer is considered in order to reduce the effect of significant short-term interference of the GPS receiver when there is a zero offset accelerometer. For the analysis the complementary filter constructed according to the filtration scheme is accepted. Second- and third-order filters are compared. The high efficiency of the filter is shown. It is shown that by choosing a certain structure of a complementary third-order filter, it is possible to eliminate the steady-state component in the filter output signal.
Accuracy estimation of the calculating algorithm the satellite’s orbit of earth remote sensing
Authors: Kate Sandeep , Wagh Sharad Sheshpao
Published: December 2022

Transformations of the coordinate systems in which the reference vectors of the initial navigation information - the flow of sunlight and the Earth's magnetic field are set - into the coordinate system of the sun-synchronous orbit of the Earth's remote sensing satellite by matrix and analytical methods are considered. The influence of the accuracy of calculating the direction cosines of the satellite orientation matrices on the accuracy of determining its orientation angles and the scanning accuracy is estimated. The estimation of the influence on the accuracy of determining the satellite orientation of the sensor errors of the primary navigation information and the features of the matrix orientation algorithm is carried out. Analytical dependencies are obtained that allow one to evaluate the influence of the noted factors depending on the position of the satellite in its orbit and the motion of the Earth along the ecliptic.
HOW DO MEDICAL STUDENTS' CHRONOBIOLOGICAL TENDENCIES AND STUDY APPROACHES AFFECT ACADEMIC PERFORMANCE?
Authors: Gamsızkan Zerrin , Gonullu Ipek
Published: December 2022

Academic performance scores of medical students have been associated with many variables. Students' sociodemographic characteristics, study times and approaches may affect academic performance separately. Examining academic performance by considering all these variables together can improve medical education. The aim of this study is to determine whether there is a significant difference between the academic performance of medical faculty students in terms of study approaches, chronobiological patterns and socio-demographic features. In this cross-sectional study, data were collected from medical students. As data collection tools, Sociodemographic Data Form, The Revised Two Factor Study Process Questionnaire (R-SPQ2F) and Morning-Evening Questionnaire (MEQ) were used. A total of 163 sixth-year students (n=90) male and (n=73) female were included in the study. There was no significant difference between the gender of the students and their academic performance scores (p=0.880). Academic performance scores of morning type students were significantly higher than those of evening type students (p<0.05). There is a correlation of 0.521 in the same direction between the deep approach and the academic performance score, and this relationship is statistically significant (p<0.001). There is a negative correlation of 0.608 between the superficial approach and the academic performance score, and this relationship is statistically significant. While developing the program and curriculum in medical education, students’ sociodemographic characteristics study approaches and chronobiological patterns should be taken into consideration.
EXAMINATION OF DIGITAL LITERACY SKILLS OF UNDERGRADUATE STUDENTS ACCORDING TO VARIOUS VARIABLES
Authors: YOLERİ SİBEL , Nur Anadolu Zeynep
Published: December 2022

The purpose of this research was aimed to determine the digital literacy skills of undergraduate students studying in different departments of the university according to the variables of gender, type of faculty, and daily internet use. In order to achieve this goal, 388 undergraduate students studying at the Faculty of Education, Faculty of Health Sciences, and Faculty of Economics and Administrative Sciences at İzmir Democracy University were determined as participants. The “Personal Information Form” prepared by the researchers and the “Digital Literacy Scale (DLS)” developed by Bayrakcı & Narmanlıoğlu (2021) and consisting of six sub-dimensions were used as data collection tools. According to the findings of the research, it was determined that the digital literacy levels of the students were moderate. When examined according to the gender variable, a significant difference was found between female and male students in the sub-dimensions of digital literacy levels. When examined according to the faculty variable, it was determined that there was a significant difference between the sub-dimensions of digital literacy levels, Daily Use, Professional Production, and Privacy and Security. As a result of the research, according to the daily internet usage variable, a significant difference was found between the General Knowledge and Functional Skills sub-dimensions of the digital literacy levels of the students according to the daily internet usage time. It is expected that the results obtained will contribute to the literature and draw attention to the development of digital literacy skills of university students.
Method of calculation of protection of information from the average length of the road between users in social networks
Authors: Akhramovych Volodymyr
Published: December 2022

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Optimization of resources distribution of radio suppression means and destructive program impact on electronics networks
Authors: Sholokhov Serhii , Samborsky Ivan , Nikolaienko Bohdan , Vasylenko Serhii , Hordiienko Yurii
Published: December 2022

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Influence of cavitation processes on river water purification of mountain streams
Authors: Yakhno Oleg , Hnativ Ihor , Hnativ Roman
Published: December 2022

Problems: The article considers the study of the influence of cavitation phenomena in hydrodynamically active areas of mountain rivers on the processes of natural self-purification of water. The paper considers the experimental results of determining the change in seasonal indicators of the hydrochemical composition of surface waters in the Stryi river basin.
Objective: to determine the impact of hydrodynamically active areas (HAA) of mountain rivers on the processes of natural self-purification and to develop methods of laboratory modeling of these areas to determine the hydrochemical parameters of river waters.
Methods of implementation: Research of ecological and hydrochemical factors of chemical composition of natural waters of the Stryi river basin combines basin and landscape-geochemical approaches, which allows to integrate various natural and anthropogenic influences, to identify the most important parameters for their detailed analysis. The combination of these approaches made it possible to improve the method of ecological analysis of the area of ​​the Stryi river basin, which allows to spatially differentiate and hydrochemically integrate the factors of formation of the chemical composition of natural waters.
Results: It is stated that microbiological safety of water is a special problem, because even water from underground sources may contain single cells of pathogenic microorganisms, but the main threat is water re-contaminated with microbes in case of leaks in the water supply network.
Conclusions: Analysis of the results of studies of the impact of self-cleaning processes in the river Stryi on the quality of water intake in Stryi showed that there are currently no negative effects of river waters of the river Stryi on groundwater deposits. The quality of river water is satisfactory for its use in domestic and drinking water supply and for recreational purposes.
Improving the quality of antifriction coatings using plastic deformation
Authors: Shepelenko Ihor , Nemyrovskyi Yakiv , Posviatenko Eduard
Published: December 2022

One of the ways to solve the shortage of anti-friction materials based on copper is the creation of anti-friction coatings on the surface of parts made from domestic raw materials. The technology of applying anti-friction coatings by finishing anti-friction non-abrasive treatment on the working surfaces of cast-iron products is considered. The use of deforming broaching to improve the quality of the antifriction coating is proposed. The reserves for their improvement due to the creation of favorable shapes and sizes of microroughnesses in the operations preceding the coating are determined. The study of the contact interaction of the microroughness of the machined surface with the tool was carried out on model samples. The main regularities of the formation of an antifriction coating on a cast-iron surface are established depending on the initial microrelief and processing modes. The effectiveness of the use of deforming broaching when applying an antifriction coating is studied by changing the height parameter of roughness. The performed studies allowed us to propose various schemes of the technological process of applying anti-friction coatings by the friction-mechanical method using deforming broaching, depending on the technical requirements for the product.
Modernization of disc laser design using ellipsoid illuminator
Authors: Kaglyak Oleksiy , Klimova Alina , Poleshko Oleksandr , Goncharuk Oleksii , Golovko Leonid
Published: December 2022

Solid state disk lasers have a number of advantages over lasers with a rod active element. In particular, due to efficient heat dissipation, there is no thermal deformation of the active element and its transformation from the optical point of view into a lens. That in turn improves the stability of the generated laser beam and reduces the risk to lose of resonator stability. In addition, disk lasers are able to generate high power at a compact size. However, to ensure the direction of the pump radiation on the active element, disk lasers require a complex mirror system of reflection of the pump beams, and therefore have design limitations on the introduction of pump energy into the active element.
This article is dedicated to the development of the design of pumping system, which will increase the intensity of pumping the active element of the disk laser, which will increase the generated power. The article presents the original design of a disk laser with an ellipsoidal illuminator and a tiered system for pumping the active element by diode laser radiation. The results of modeling the heat dissipation from the active element to the refrigerator are presented. The estimation of the efficiency of excitation of the active element when using an ellipsoidal illuminator and the procedure for calculating the parameters of the generated laser beam are given.
Corrugation prediction in process of sheet drawing based on the results of modeling in the DEFORM environment
Authors: Orliuk Mykhailo
Published: December 2022

In a process of sheet drawing technology developing, the probability of workpiece buckling during deformation and the necessity of blank holder using to prevent corrugation, is estimated in accordance with the recommendations of the reference book. However, reference literature does not have clear recommendations, or it gives contradictory recommendations for blank holder use cases for some deformation conditions. In these cases, problem solving requires additional experimental research.
Possibility and efficiency establishing of computer simulation using DEFORM environment of axisymmetric drawing processes to forecast the buckling of a thin-sheet workpiece during deformation.
Technological processes of sheet drawing with a high probability of workpiece buckling were investigated by means of finite element computer simulation in DEFORM 3D.
Research has established that simulation of thin-sheet workpiece drawing process in DEFORM 3D, allows to visualize the process of corrugation, and predict workpiece buckling with high probability, provided that the deformation occurs relatively simple geometry of the workpiece and deforming tool. In more complex deformation conditions, the experiments results, and computer simulation may differ (simulations may not indicate corrugation). This somewhat complicates corrugation prediction, but the problem is solved by an extended analysis of the stress-strain state and workpiece behavior in the deformation zone. The emergence of areas in the workpiece with an unpredictable and uncontrolled contact loss of the workpiece material with the deforming tool, or appearance of areas with significant irregular velocity of workpiece points movement, clearly indicates problem areas with high probability of corrugation in the real sheet drawing process.
Obtained results allow to increase the efficiency of expecting places of corrugation appearance prediction by means of computer simulation of sheet drawing process in the DEFORM 3D environment.
Methods of the terrain allowable slope determining for safe operation of specialized equipment under the non-stationary load action
Authors: Machuga Oleg , Borys Mykola , Lusta Yurii
Published: December 2022

The operation of modern high-tech equipment requires a clear delineation of safe conditions for its operation. To a large extent, this applies to machines that move and work on untreated soil surface: forestry machinery, agricultural machinery, road construction machinery, military equipment, and so on. Asymmetry of the location of the working bodies, work on surfaces with a lateral slope, non-stationary interaction with the working environment - these are the factors that increase operational risks.
Objective of this study is to establish the limits of safe operation of specialized machines operating on a rough surface with a slope to the horizon.
The methods of determining safe slopes for the above-described equipment in the conditions of its non-stationary interaction with the subject of work are considered in the work. In particular, dangerous slopes that can cause the car to overturn or roll sideways are identified. The realization of this goal is achieved by building a mathematical model and appropriate calculation schemes that cover both possibilities of loss of stability. Graphs are plotted to display the maximum slopes due to the overturning and sliding of the machine on the slope for the specified operating loads. The integral characteristic of the slope limit value covers both of the above risks.
The application of the proposed methods is illustrated by the calculation of the safe slope for firing tanks for different angles of deviation of the gun from the surface of the movement on the slope and the type of ground surface of the movement. The following results were obtained: methods for calculating the allowable slopes for the possibility of operating specialized machines on them, taking into account soil conditions, and demonstrated the application of the approach to the case of military equipment.
The use of these results is a necessary factor for the implementation in the design of technological processes for specialized machines in order to minimize operational risks.
Semi-analytical implicit direct time integration scheme on example of 1-D wave propagation problem
Authors: Orynyak Igor , Mazuryk Roman , Tsybulskyi Volodymyr
Published: December 2022

The most common approach in dynamic analysis of engineering structures and physical phenomenas consists in finite element discretization and mathematical formulation with subsequent application of direct time integration schemes. The space interpolation functions are usually the same as in static analysis. Here on example of 1-D wave propagation problem the original implicit scheme is proposed, which contains the time interval value explicitly in space interpolation function as results of analytical solution of differential equation for considered moment of time. The displacements (solution) at two previous moments of time are approximated as polynomial functions of position and accounted for as particular solutions of the differential equation. The scheme demonstrates the perfect predictable properties as to dispersion and dissipation. The crucial scheme parameter is the time interval – the lesser the interval the more correct results are obtained. Two other parameters of the scheme – space interval and the degree of polynomial approximation have minimal impact on the general behavior of solution and have influence on small zone near the front of the wave.
Substitution of equations for evaluation of energy consumption in rotor-stator mixers
Authors: Seminskyi Oleksandr
Published: December 2022

In the presented publication, an attempt to develop the theory of mixing by considering rotor-stator mixers from the standpoint of mechanical mixing devices was made.

The results of the research on energy consumption are given in the form of analytically substituted expressions for determining power and pressure difference as well as a flow rate in a stage of rotor-stator mixer composed of a pair of the perforated rotor and stator elements with a gap between them, depending on the features of the design, dynamic characteristics of the rotor and flows. The interrelationships between power, pressure difference, and flow rate in the stages of rotor-stator mixers are established. This makes it possible to define the characteristics of mixers, carry out their calculations and reasonably accept the rational design and processing parameters. The peculiarities of the components in obtained equations are indicated. Partial cases of the equations for power consumption in stages of rotor-stator-mixers operated in pulse and impulse modes are considered. The invariant form of obtained equations would help to ease the scaling of rotor-stator mixers.
Applications of randomly selected sets of exact Voight's solutions for vibration of thin plates
Authors: Orynyak Igor , Bai Julia , Kostiushko Iryna
Published: December 2022

The principally new method of selected exact solutions, SES, for plate vibration based on fundamental solutions of Voigt is suggested. In contrast to similar known methods, it employs the frequency dependent functions for both space coordinates. The sets of exact solutions which depends on some arbitrary chosen parameters are constructed. This allows to choose any number of exact solutions, while the required number of them depends on the boundary conditions which should satisfy in considered collocation points.
The efficiency of method is demonstrated for the most unfavorable case of all sides clamped rectangular plate. Nevertheless, the accuracy is quite satisfactory for first six natural frequencies even for relatively small number of collocation boundary points, and testify about big prospects as to application for complex structures, different geometries, various boundary conditions.
Additionally two variants of the Galerkin method are realized and compared. First one, employs the exponential functions, while the second one –the very popular beam functions. The calculation results show the superiority of first variant as in technical realization as in accuracy, and in further applications in structural mechanics.
Application of erosion dimensional treatment methods for creation transversal fasteners in “metal-composite” joints
Authors: Taranenko Igor
Published: December 2022

At design of high-loaded units of engineering objects, especially such as articles of aero-space engineering, the problem of creation of reliable joints between metal and composite articles having predefined strength and ability to fulfill given functions appears.
Development and grounding of selection of structural-manufacturing solutions of “metal-composite” joints with transversal fastening elements is selected as the objective of studying.
As the object for studying possible structural-manufacturing solutions of “metal-composite” joints that use transversal fastening elements which are embedded to composite and attached to metal article or produced on its surface. Three types of fastening micro-elements are considered, i.e. pyramidal monolithic, cylindrical and sheet-formed, also different technologies of fastening elements production are considered too.
Mass of typical flat article with micro-pins at given load-carrying ability of “metal-composite joint” was esti-mated for above-mentioned types of micro-fasteners.
Such quantitative indexes of manufacturability as labor-intensity and energy consumption of fastening elements production were considered as results of studies.
Approach to comparison methods of fastening elements manufacturing is suggested. This approach is based on analysis of correspondent numerical specific indexes of labor-intensity and energy consumption. These indexes are com-pared for micro-pins which are assumed to be produced of aluminum, titanium alloys and stainless steels.
Distinctive feature of suggested model of analysis is taking into consideration both main and auxiliary techno-logical operations, which influence significantly on manufacturing labor-intensity and duration. Process of classical milling with cylindrical and disc mills is compared with up-to-date methods of electro-erosion cutting with wire.
Recommendations for selection shape, type and arrangement scheme of micro-fasteners on article surface and exact manufacturing process of micro-pins production at given material are formulated as conclusions.
Quantitative evaluation of properties of structural solutions of electrohydraulic positioning actuators
Authors: Li Qiang , Uzunov Oleksandr
Published: December 2022

Based on the analysis of known electro-hydraulic positioning actuators, its generalized scheme was given, which includes: control unit, command formation unit for reaching given position, executive mechanism, position sensor, and hydraulic energy supply unit. It was determined that the main difference between the actuators lies in the command formation unit, the structural solutions of which are based on four control methods: analog control of fluid supply to reach preset position; discrete control the time of fluid supply to reach preset position; discrete control of fluid supply to reach preset fixed position; discrete control of portioned fluid supply to reach preset position. For various structural solutions of actuators, the influence of the main parameters on their effectiveness in achieving the basic properties was analysed. A quantitative evaluation was proposed, which made it possible to reveal the relationship between the structure and properties of the actuators. The obtained results can be used to develop new effective positional actuators.
Application of Laser Thermocycling to Improve the Quality of Plasma Wear-Resistant Coatings
Authors: Golovko Leonid , Kaglyak Oleksii , Romanenko Viktor , Bloshchytsyn Mykhaylo
Published: December 2022

The problem of the article is designed to reveal the proposed, developed and researched new method of improving the adhesion strength of plasma wear-resistant coatings on the outer surfaces of weapons made of high-alloy, heat-resistant steels, using additional cyclic (3-4) times their heating by laser radiation to temperatures of 0.6 – 0.8Tpl for a few milliseconds.
The purpose of increasing the resource of use and the quality of the appearance of the weapon by applying wear-resistant coatings with increased adhesion strength to the base using plasma gas-thermal spraying followed by laser thermal cycling.
Determination of the main factors and parameters of the process of laser thermocycling of plasma coatings, their interrelationships, development of an algorithm for determining the conditions of laser thermocycling, establishment of the rational range of their values by mathematical modeling and experimental research.
The results of mathematical modeling of laser cyclic heating of plasma coatings of HTN of different thicknesses are presented, which allows determining the irradiation parameters that ensure their heating to temperatures at the "coating-substrate" boundary ≤1000ºС, on the surface - to Т< Тpl, at maximum cooling rates. It has been proven that laser thermocycling provides an increase in the adhesion strength of coatings to the base from 14–18 to 90–110 MPa, a decrease in porosity from 10–12% to 7–8%, which is due to the redistribution of alloying components at the “coating–base” interface, with the formation of elements of the metallurgical connection, contributes to a significant increase in wear resistance and a decrease in the coefficient of friction due to the formation of secondary ultradispersed film structures.
We consider laser thermocycling of plasma coatings is an effective method of improving their quality and strength of adhesion to the base.
SOFTWARE METHODS ANALYSIS OF OPTIMIZING THE LOCAL STATE OF DATA WEB APPLICATIONS MANAGEMENT
Authors: Оleshchenko Lyubov , Burchak P.V.
Published: December 2022

Background. The use of various libraries often leads to a decrease in the speed of the web application and the complexity of the execution of the program code. The object of this study is the process of storing and managing the data of the client part of the web application, the subject of the research is the software methods of managing the local state of the data of the web application.
Objective. The goal of the article is the reduction in the data processing time of web applications relative to existing software methods.
Methods. The main idea of ​​the proposed method is to use an atomic approach to the state of the web application data. Having an arbitrary entity, in the general state of the web application, a state fragment is created that is responsible only for this entity. Such a fragment is independent of other state fragments and can only work with the encapsulated entity. Using encapsulation, the configuration of an entity is passed to the React Context API as an object containing data and functions that modify it.
Results. The developed framework method was compared with popular state management libraries Redux, MobXState-Tree and Recoil. Comparing each of the test scenarios in a percentage ratio, an average decrease in program execution time by 17% was obtained.
Conclusions. The Redux, MobXState-Tree, and Recoil libraries were selected for the research of existing software methods. The analysis of methods was performed using the SonarQube utility. To evaluate the results of the software methods, the Google Chrome browser utility DevTools was used. The proposed optimized software method allows to reduce the data processing time and optimize the state management of web applications.
  Keywords: web application, optimization, local state of data, Redux, MobXState-Tree, Recoil.
Предельная точность сверхширокополосной оценки скорости
Authors: Трифонов Андрей Павлович , Беспалова Марина Борисовна , Кузнецов А. В.
Published: December 2022

Рассмотрены характеристики оценки максимального правдоподобия и байесовской оценки при квадратичной функции потерь с учетом аномальных ошибок. Показано, что применение байесовского алгоритма позволяет уменьшить ошибки измерения скорости в пороговой области. Определены оптимальные параметры зондирующей последовательности импульсов, обеспечивающие минимальные ошибки измерения скорости.
Субоптимальная параметрическая идентификация нелинейных стохастических систем
Authors: Мамай В. И. , Сотников А. В. , Щербань Оксана Георгиевна
Published: December 2022

Задача параметрической идентификации стохастических нелинейных систем решена на основе использования обобщенных вероятностных критериев, что позволяет обеспечить потенциально большую точность процедуры «оценивания—идентификации» по сравнению с традиционными методами и инвариантность объема вычислительных затрат к размерности вектора неизвестных параметров.
Предельное качество обнаружения и разрешения сигналов в обнаружителе на основе согласованного проектора
Authors: Бондаренко Борис Федорович , Бондарчук Г. Н. , Тимчук Владимир Юрьевич
Published: December 2022

Оценена предельная эффективность одного из новых методов обработки сигналов, обеспечивающего высокое разрешение коррелированных и не коррелированных сигналов.
Эффективность определения кода фазоманипулированных сигналов в акустооптическом демодуляторе в условиях внешних и внутренних помех
Authors: Нахмансон Геннадий Симонович , Маньков П. Л.
Published: December 2022

Рассмотрена эффективность определения закона изменения кодовой последовательности фазоманипулированного сигнала в акустооптическом демодуляторе при приеме фазоманипулированного сигнала в условиях внешних и внутренних помех для случая, когда длительность отдельного импульса фазоманипулированного сигнала соизмерима с размерами апертуры ультразвукового модулятора света. Анализируются вероятности обнаружения наличия и отсутствия бросков фаз сигнала.
Результаты экспериментального определения точности автоматического сопровождения низколетящих объектов радиолокационным координатором с моноконическим методом пеленгации
Authors: Антонец В. В. , Тимчук Владимир Юрьевич
Published: December 2022

Приведены результаты экспериментального определения точности автоматического сопровождения низколетящих объектов радиолокационным координатором с моноконическим методом пеленгации.
Метод оценки спектральной плотности мощности информационного сигнала для расчета формантной разборчивости речи в условиях сосредоточенных помех
Authors: Бабусенко С. И. , Бондарцов Ю. А.
Published: December 2022

На основе свойств функции когерентности предложен метод оценки спектральной плотности мощности информационного сигнала при наличии сосредоточенных помех. Приведены результаты инструментального расчета артикуляционных характеристик при приеме сигналов с однополосной модуляцией в условиях воздействия сосредоточенной помехи, модулированной по фазе гауссовским случайным процессом.
Интеллектуальное определение спектра когнитивного радио на основе детектирования энергии для сложных сигналов
Authors: Кумар Арун , Шарма Химаншу
Published: December 2022

В статье разработан и промоделирован метод определения спектра на основе детектирования энергии ED (energy detection) для метода частотного мультиплексирования нескольких несущих с универсальной фильтрацией трафика UFMC (Universal Filtered Multi Carrier). Кроме того, проектирование и анализ предложенной системы и системы мультиплексирования с ортогональным частотным разделением каналов OFDM (Orthogonal Frequency Division Multiplexing) с использованием циклического префикса CP (Cyclic Prefix) и без него, проведено с точки зрения точного обнаружения, ложного обнаружения, пиковой мощности, частоты битовых ошибок (BER), и спектральной плотности мощности (PSD). Видно, что ED эффективность выше для UFMC структуры по сравнению с OFDM системой.