bluuebunny/crossref_metadata_2025 huggingface dataset:
Nasal Carriage of Staphylococcus aureus among staff and Students of University of Sciences and Technology, Aden-Yemen
Authors: Mohammed A. A. Al-Baghdadi
Published: December 2022

Background: Colonization of human nose by Staphylococcus aureus represent up to 30% of the human population. S. aureus must defeats the host’s defense mechanisms in order to colonize the nasal epithelial cells of human. Some factors such as bacterial interaction in human nose can prevent such colonization.Aim: The aim of current study was to determine the prevalence of nasal colonization by S. aureus among the staff and students of University of Science & Technology, Aden; as well as the associated risk factors for nasal carriage.Subjects and Methods: The type of study was an institution-based cross-sectional study which performed during the period from January to March 2020. The total samples were 1030 nasal swabs obtained from all the staff and students, the specimens were transported to the laboratory and the swabs were processed within 4 hrs. of collection.Results: The mean age of the study sample was 21.4 (±5.8 SD). The prevalence S. aureus isolated from nasal carriages was 31%. S. aureus nasal carriage show high frequency among age group 27-36 (32.4%) followed by those at age of 17-26 years (31%), however, there was no a statistically significant association in relation to the age groups (P=0.9). Regarding gender, it was considered a risk factor. S. aureus more common in male than female. The pattern of sleep, smoking, and frequent touching the nose were statistically associated with the S. aureus nasal colonization. Those who had nasal sensitivity was considered risk factor (RR=1.3) but with non-significant association with S. aureus nasal colonization (P=0.4).Conclusion: The current study revealed that community acquired was the potential colonizers of S. aureus. With the prevalence of 31% of the study sample, age, gender, and smoking, and other were potential risks. Regular screening of carriers is required for prevention of community acquired infections.
Development of Nanoliposome of Labisia pumila Standardized Extract
Authors: Mohammed Ali Ahmed Saeed  , Abdul Hakeem Memon  , Armaghan Shafaei  , Moh'd Shahrul Ridzuan Hamil  , Amirin Sadikun  , Zhari Ismail
Published: December 2022

Background: Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila has been used traditionally for the treatment of several ailments such as gonorrhoea, dysmenorrhoeaand as tonics for females females.AimsAims: To investigate the standardization procedure of Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila extract (LPE) and evaluation of its nanoliposomes.Methods:Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila Labisia pumila extract was standardized by high performance liquid chromatography (HPLC), and gallic acid, caffeicacid, rutin and 2,4 2,4-Di -tert tert-butylphenol were quantified in the extract. Then, the standardized extract was prepared as nanoliposomeusing soy bean phospholipid by the film method and after that was characterized by zetasizer, zeta potential, UV -Visspectrophotometer and FTIR techniques techniques.Results:For the standardization, the mean percentage recovery values of the concentration studied were 98.49 98.49±1.43, 97.01 97.01±2.04,97.7097.70±1.55 and 99.43 99.43±3.04 % for gallic acid, caffeic acid, rutin and 2,42,4-Di -tert tert-butylphenol, respectively. The accuracy values werebetween 95.06 and 104.86% for the marker compounds, while the corresponding precision values were betwee n 0.09 and 5.18% forwithinwithin-day and between between-day analysis, respectively. The average particle size for LLP was 174.20±4.58 nm with zeta potential ofparticles surface charge from −43.40 to − 44.40 mV. The polydispersity index was 0.19±0.02 and the morpholo gy and presence ofliposomes were further confirmed by transmission electron microscopy which revealed the presence of spherical liposomes of < 200nm.Conclusion:HPLC method for the simultaneous determination of selected marker compounds has been develop ed; the method wasreliable, repeatable and reproducible. The method was successfully applied in standardization of LPE. LPE was successfully pr eparedas nanoliposome using soybean phospholipid.
Engineering Structural Strength Properties of Lateritic Soil-Cement Mix for Road Pavement Stability
Authors: Omowumi Ademila
Published: December 2022

Qualitative construction materials in highway pavement prompted addition of cement at different proportion of 2 - 10% to lateritic soils for enhanced performance. Engineering geological tests were performed on the soil-cement mixture to determine their highway pavement suitability for durable road construction. Furthermore, modelling of the strength characteristics of the mixture presents the correlation between the structural properties and cement mix. Thus, increase in soil-cement California bearing ratio (CBR) and unconfined compressive strength (UCS) values with higher cement mix of 8%, revealed enhanced soil improvement. The soil strength is also affected by the curing period. Better quality strength characteristics obtained decreases pavement thickness with reduced cost in road construction. Relationship between the soil strength properties and cement mix content are represented by polynomial model. This reveals stronger bearing capacity of soil cement mix cured in 14 days with R2 ≥ 0.8. The lateritic soil cement mix at 8% cement content could serve as highway subbase and base construction materials. Cement mix having positive effects on soil geotechnical properties are indication of its effectiveness in enhancing volume stability of different soils. Prolong curing time is essential for compacted soil cement mix for enhanced geotechnical engineering properties and to improve the quality of lateritic soil used as road construction materials. Thus, cement-stabilized lateritic soil reduces cost of road construction, its persistent failure, human and environmental losses.
Canes vagabundos nocturnos que transitan por las calles del Centro histórico de Lima – Perú
Authors: Leyva Ayón Kaori
Published: December 2022

El objetivo del estudio fue estimar la población y describir las características demográficas y estado de bienestar de los canes que transitan libremente por las calles del Centro Histórico de Lima en horario nocturno. Para ello se realizó un estudio observacional, transversal y descriptivo. Para ello se tomó en consideración el Plano de la Municipalidad de Cercado de Lima, el cual fue dividido en seis bloques utilizando los siguientes límites: en línea transversal la Av. Tacna, Jr. De la Unión y Av. Abancay; y de manera transversal se limitarán los bloques con el Jr. Moquegua y Jr. Huallaga. Cada uno de los bloques fue evaluado en un día específico. Se realizaron tres mediciones por cada sector en 3 días consecutivos en el horario de las 22 a las 24 horas. En una ficha epidemiológica se registró información de número, tamaño (pequeño, mediano y grande), sexo (hembra, macho e indeterminado), condición corporal (flacos aceptable u obeso), cojera (sí, no) y estado de la piel (con o sin lesiones visibles). La información obtenida del estudio se resumió mediante estadística descriptiva.  El estudio encontró un promedio total de 38 canes vagabundos y se estimó una media de 3.7 canes vagabundos por cada Km2 y 26 canes vagabundos por cada 100,000 habitantes. Las características predominantes de los canes vagabundos fueron de sexo macho, tamaño grande y de condición aceptable. La presencia de lesiones en la piel y signos de cojera fue mínimo. A partir de los resultados se pueden tomar acciones que permitan cumplir con la Ley 27596, Ley que Regula el Régimen Jurídico de Canes a fin de disminuir la presencia de canes vagabundos en el Centro Histórico de Lima.
Características de las mordeduras de canes en pacientes atendidos en el Hospital Nacional Guillermo Almenara Irigoyen en Lima, periodo 2017-2020
Authors: Noel P. Mariel Del Rosario , León C. Daphne
Published: December 2022

El objetivo del estudio fue describir las características de los accidentes por mordedura de canes en pacientes atendidos en el Hospital Nacional Guillermo Almenara Irigoyen en Lima durante el periodo 2017-2020. Para ellos se elaboró una base de datos en Excel con toda la información recolectada de las fichas epidemiológicas elaboradas por el MINSA para accidentes por mordeduras de perros (modelos del año 2015 como del 2017) considerando como variables de estudio a: grupo etario, sexo, grado de instrucción y distrito de procedencia de la víctima, propietario del animal agresor; número, tipo, localización, tratamiento y lugar de la lesión, así como el distrito del accidente. La información se analizó con STATA 15.0 y se resumió mediante estadística descriptiva. De un total de 187 fichas epidemiológicas, la mayor proporción de reportes por accidentes de mordeduras de canes se presentaron en varones (66.8%), en el grupo etario de 5 a 9 años (74%), en Lima Este (46%), y durante el 2019 (79%). Predominaron los ataques ocasionados por canes conocidos por la víctima, de tipo grave (97.9%), con heridas múltiples (47.1%), profundas (58.3%) y no infectadas (60.4%). Asimismo, la mayoría de los casos fueron reportados el mismo día de la lesión (44.9%) y solo requirieron de atención ambulatoria (60.4%). Los resultados pueden servir de evidencia para fortalecer las actividades de vigilancia, control y  prevención de estos accidentes y dar a conocer la importancia de reportar cualquier caso de accidente por mordedura de canes.
Improving product redesign efficiency in the detailed design phase: a structure variation map based on customer environment requirements
Authors: Xuan Yan , Zheng Yu , Zheng Chenxing , Li Ziqi , Zhang Lei
Published: December 2022

Aim: The aim of this study is to shorten the product design and development cycle to meet the continuous change and growth of customer environmental requirements. Methods: The applied research method introduces the concept of the inheritable structure of green products through structural similarity theory and quantitates environmental performance. Additionally, based on the analysis of the obtained customer ecological requirements, a hierarchical mapping method for customer requirements-environmental performance weight-product structure is proposed, which achieves the rapid mapping of customer requirements (CRs) to product structure in the product design process. Then, four mutation operation methods (combination, decomposition, replacement, and material change) are combined with a genetic algorithm, and a method for generating a product structure mutation map is proposed to solve the problem of the non-inheritance of some structures in the product design process. Finally, considering the transmission shell as an example, the validity and feasibility of the method are verified. Results: The case study showed that the overall mass of the rear derailleur dropped by 27.58 kg, and the environmental performance of the transmission was mainly related to its mass; hence, the proposed improvement method effectively improved the environmental performance of the transmission. Conclusion: The hierarchical mapping method for customer requirements-environmental performance weight-product structure and the generation method for the product structure variation diagram proposed in this study can shorten the product design and development cycle. This research can provide theoretical and methodological support for product design and development.
Towards the creation of the future fish farm
Authors: Papadopoulos Pavlos , Buchanan William J. , Sayeed Sarwar , Pitropakis Nikolaos
Published: December 2022

Aim: A fish farm is an area where fish are raised and bred for food. Fish farm environments support the care and management of seafood within a controlled environment. Over the past few decades, there has been a remarkable increase in the calorie intake of protein attributed to seafood. Along with this, there are significant opportunities within the fish farming industry for economic development. Determining the fish diseases, monitoring the aquatic organisms, and examining the imbalance in the water element are some key factors that require precise observation to determine the accuracy of the acquired data. Similarly, due to the rapid expansion of aquaculture, new technologies are constantly being implemented in this sector to enhance efficiency. However, the existing approaches have often failed to provide an efficient method of farming fish. Methods: This work has kept aside the traditional approaches and opened up new dimensions to perform accurate analysis by adopting distributed ledger technology. Our work analyses the current state-of-the-art of fish farming and proposes a fish farm ecosystem that relies on a private-by-design architecture based on the Hyperledger Fabric private-permissioned distributed ledger technology. Results: The proposed method puts forward accurate and secure storage of the retrieved data from multiple sensors across the ecosystem so that the adhering entities can exercise their decision based on the acquired data. Conclusion: This study demonstrates a proof-of-concept to signify the efficiency and usability of the future fish farm.
POPE FRANCIS AND THE CHALLENGE OF ECCLESIAL INTROVERSION: WHERE IS HE COMING FROM? WHERE IS HE GOING?
Authors: Deck Allan Figueroa
Published: December 2022

ABSTRACT: The presentation focuses on the reception of Pope Francis’s ecclesial reform and his persistent call for comprehensive pastoral conversion as outlined in Evangelii gaudium. The author discusses the reforms as rooted in the Church’s identity and mission to evangelize in the fullest sense of the word as understood in the teaching of the Second Vatican Council and developed in the subsequent magisterium. The author addresses the toxic environment created by social media, a primary source of misinformation and fearmongering which leads to growing resistance and polarization among some church leaders and faithful. The resistance to accepting Pope Francis’s remarkable ecclesial vision for some sectors of the Church revolves around a harmful reaction which Pope St. John Paul II called ecclesial introversion. The unfamiliarity and even strangeness of his Latin Ameri- can and Jesuit roots and to the legacy of Medellín and the subsequent CELAM gatherings at least partially explain the challenge Francis’s bold reforms present to the global Church.
KEYWORDS: Social Media. Pastoral Conversion. Ecclesial Introversion. Synodality. Ecclesial Discernment.
AS ANEDOTAS DE ATOS: HÁ UM PADRÃO FORMAL EM ATOS DOS APÓSTOLOS 19.13-16; 20.7-12; 28.1-6?
Authors: Leite Francisco Benedito
Published: December 2022

RESUMO: No presente artigo analisamos três perícopes do livro de Atos dos Apóstolos (19.13-16; 20.7-12; 28.1-6) e, a partir da análise realizada, apontamos para a existência do gênero anedota nessas passagens neotestamentárias. Partimos da revisão dos principais estudos diacrônicos e sincrônicos feitos sobre o livro de Atos. Como metodologia, utilizamos os procedimentos da crítica das formas, uma vez que nesse texto discutimos a existência de um gênero literário que supostamente é ignorado pela exegese bíblica tradicional. No entanto, esse método típico da metodologia da exegese histórico-crítica é combinado com a teoria do romance de Bakhtin para propor renovação na abordagem teórica. As três perícopes mencionadas são analisadas a partir do texto grego. Assim, constata-se que, de fato, há anedotas no livro de Atos e que nesse livro a referida forma literária tem uma função dentro da narrativa, a de oferecer pausas no conteúdo da narrativa da obra lucana. Além disso, o resultado do estudo também aponta para a relevância da comicidade no Novo Testamento.
PALAVRAS-CHAVE: Anedota. Subgênero. Atos. Cômico. Lucas.
OTRA PERSPECTIVA DE LA ANOREXIA. MÁS ALLÁ DEL DICTAMEN MÉDICO.
Authors: Arango Carlos
Published: December 2022

Este trabajo etnográfico sobre el comportamiento cultural de las anoréxicas en un espacio de comunicación virtual persuasivo, pudo evidenciar el uso de sus verbalizaciones e imágenes que fundamentan las motivaciones y pautas de esta práctica, además de una guía expuesta en categorías donde pudimos concluir que esta patología se comporta como culto espiritual donde es vital la comunicación con ANA, la deidad de esta práctica que tiene sus propios símbolos e imaginarios, a través de un foro virtual. Todo desde una oportunidad única y es escribir desde el protagonismo de este padecimiento y haber regresado tiempo después para poder documentarlo.
Solving the Mystery of Time and Unifying Relativity with Quantum Mechanics
Authors: Niemz Markolf H. , Stein Siegfried W.
Published: December 2022

Today's concept of time traces back to Albert Einstein's theories of special (SR) and general relativity (GR). In SR, uniformly moving clocks are slow with respect to my clocks. In GR, clocks in a more curved spacetime are slow with respect to my clocks. Many physicists anticipate that GR has an issue as it isn't compatible with quantum mechanics. Here we show: "Einstein time" (Einstein's concept of time) has an issue because it takes the proper time of an observer as the fourth coordinate of all objects in the universe. We claim that there is a unique 4D vector "flow of time" for each object. SR and GR work well as approximations, but only if we consider objects on and close to Earth, where that vector is nearly the same. "Euclidean time" is distance covered in Euclidean spacetime (ES) and divided by the speed of light. We replace Einstein time with Euclidean time, which takes the proper time of an object as its fourth coordinate. Unlike other models of Euclidean relativity (ER), we claim that reality is only formed by projecting ES to an observer's 3D space. We prove: The Lorentz factor is recovered in ER; acceleration relates to a 4D rotation; ER is compatible with quantum mechanics! We solve 13 mysteries, such as mc2, gravitational time dilation, the Hubble constant, wave–particle duality, and quantum entanglement. We declare four concepts of today's physics (cosmic inflation, expansion of space, dark energy, non-locality) as redundant. We conclude: As ER outperforms SR and GR, Occam's razor knocks out Einstein time.
Studying the Effect of the Tangential Nonuniformity of Flow Parameters on Gas Dynamic Performances of the Nozzle Cascades of Turbine Machines
Authors: Lapuzin Alexander , Subotovich Valery , Yudin Yuriy , Naumenko Svetlana , Malymon Ivan
Published: December 2022

Aerodynamic efficiency of the nozzle cascades of steam and gas turbines is defined by many factors and one of them is the tangential and radial nonuniformity degree of the parameters of a spatial flow behind the cascades. The averaging of these parameters enables the determination of the integral parameters of the cascades, in particular two flow angles and the velocity angle or the kinetic energy loss coefficient. The angle that takes into account the level of the averaged radial component of the velocity defines the level of kinematic losses in the cascade. Even in the case of the cylindric boundaries of the cascade this angle differs from zero and kinematic losses decrease the cascade efficiency by 30 to 50 percent. This scientific paper gives the results of experimental investigations of the effect of the circumferential nonuniformity of the velocity and the angles of the spatial flow on kinematic losses at different radii of the nozzle cascade of the last stage of the steam turbine and the nozzle cascade of the first stage of the gas turbine. The kinetic energy loss coefficient and the coefficient of total losses were suggested as the integral characteristics of the cascades. In the case of cylindric boundaries of the stage the total loss-to-kinetic energy loss ratio is noticeably decreased during the transition from the average zone to the zone of end losses. However, in the peripheral zone of the nozzle cascade of the last stage of steam turbine total losses are three times higher than kinetic energy losses due to the fact that the radial component of the velocity behind the cascade is much higher than the flow rate component and the level of the losses of kinetic energy is not high.
THE PROBLEM OF PRODUCTIVITY INCREASE OF THE UNSTRESSED KEYWAYS JOINTS
Authors: Gaydamaka Anatoly , Kulyk Hennadii , Muzykin Yuri , Borodin Dmytro
Published: December 2022

This paper reports the location of stress concentration and compares the results obtained by theoretical analysis with the analysis done by the analysis software. In order to avoid economic losses of production due to stoppages related to repair work, there is a need to study the development of measures to increase their reliability. Despite knowing the importance of this a very little research work has been reported in this field. An appropriate analysis of the literature was carried out in order to find directions for improving methods performance of keyed joints. The paper analyzes the features of the work of the most common non-stressed connections prismatic keys. Analysis of the state of operation of non-stressed keyed joints, directions for improving their designs, and modern simplified method of calculation explains the relevance of studies of workability and reliability improvement. Ways have been considered to increase the reliability of connections with prismatic keys. In this work, a review of some of the latest, most interesting, by the author's opinion, is carried out, studies on the contact interaction of parts. The requirements for the development and research of new keyed joints are formulated. The basic design of the connection with cylindrical working surfaces of the key is adopted. Known methods of determination are analyzed contact deformations by various scientific schools. The requirements for the development of the method of calculating unstressed keyways are formulated connections. All our calculations were primarily made based on the method of the Scientific School of Volgograd State Technical University and it was adopted as the basic one.
Key words: non-stressed keyed connections, unstressed keyed connections, reliability, keyway connection with a cylindrical segment, contact deformation, destruction, improvement of the design, self-locking of the key, fracture
OBJECTIVE FUNCTION OF PARAMETRIC OPTIMIZATION OF THE SPEED OF A CLOSED PLANETARY MECHANISM FORMED BY TWO SIMPLE JAMES PLANETARY MECHANISMS
Authors: Sharaban Jurij , Matusevich Vladimir , Shehov Aleksandr
Published: December 2022

The results of building а mathematical model of estimation the speed of the designed construction of the closed planetary mechanism formed from two simple planetary mechanisms of James are presented. The speed of the designed construction of the mechanism is estimated by the value of the equivalent moment of inertia of the mechanism links reduced to its input shaft. A model is a dimensionless function (analogue the equivalent moment of inertia) of two variables - transmission relations of simple planetary mechanisms, and set of numerical parameters. The parameters take into account the values of the coefficients that characterize the mass inertia models of gears and planet carriers, the design and strength limitations of external gears of simple planetary mechanisms of James, as well as the structure of these mechanisms. Set of values of parameters and range of varying of possible values of transmission relations of simple planetary mechanisms influence on position of a minimum of the analogue the equivalent moment of inertia. The influence of the number of planetary gears of simple planetary mechanisms and the moment of inertia of the planet carrier of the differential mechanism on the positions of the minima of the analogues of the reduced moment of inertia of a closed planetary gear was analyzed in calculations for contact strength and bending strength. Based on the function of the analogue of the equivalent moment of inertia, the objective function of parametric optimization of the project fast-acting of the design of a closed planetary mechanism is built.
Keywords: simple James planetary mechanism (mechanisms type ); closed planetary mechanism; moment of inertia of gear-wheel; moment of inertia of the planet carrier; moment of inertia of the planetary mechanism; contact strength of the gearing; bending strength of the gearing; parametric optimization; parametric optimization of the equivalent moment of inertia of the planetary mechanism
DEVELOPMENT OF APPROACHES, METHODS AND MODELS OF RESEARCH OF DURABILITY AND LONGEVITY OF TORSION BILLOWS OF THE SUSPENSION SYSTEM THE LIGHT ARMORED VEHICLE
Authors: Tkachuk Mykola M. , Zavorotnii Anton , Zinchenko Olena , Grabovskiy Andrey , Tkachuk Mykola А. , Pinchuk Nataliya , Shevchenko Andriy , Tsendra Heorgii
Published: December 2022

The analysis of materials on approaches, methods and models of research of strength and durability of torsion shafts of systems of suspension of light armored vehicle is carried out. It is concluded that despite the existing significant theoretical developments, the analysis of elastic-plastic deformation of materials of highly loaded structures, including torsion shafts, requires the development and adaptation of appropriate models. The approach to a number of studies on this issue also needs to be developed. As a result of a number of researches, the following model of stress-strain state was performed. The generalized parametric description of the stress-strain state of the torsion shaft contains varied design and technological factors and process parameters. The mathematical model of the stress-strain state of a torsion bar of incremental type has been formulated. It accounts for the contact and elasto-plastic deformation of the material of the torsion bar. At the same time, the stress-strain state depends on the loading history.  A parametric model provides advantages in justifying rational technical solutions. This applies to both design and technological solutions. Also, all significant factors at all stages of the life cycle of torsion bars are taken into account. These factors have significant interplay.  Ultimately, the determined design, technological and operational parameters satisfy the conditions of the increased strength and durability of torsion bars.  The mechanical and physico-mechanical properties of materials used to manufacture the torsion bars are another important factor with regard to these criteria.  Accordingly, a complex workflow is established in order to design and improve the torsion bars for the suspension systems of light armored vehicles with increased technical characteristics.
Keywords: light armored vehicle; performance characteristics; torsion shaft; suspension systems; stress-strain state; strength; durability; elastic-plastic deformation
NEW PHYSICAL FACTORS IN CONTACT INTERACTION OF ELASTIC BODIES OVER CLOSELY MATCHED SURFACES
Authors: Tkachuk Mykola M. , Pinchuk Nataliya , Tkachuk Ganna , Klochkov Illia , Tkachuk Mykola А. , Sіerykov Volodymyr , Grabovskiy Andrey , Hrechka Iryna , Kutsenko Serhii , Cymbal Ganna , Koba Andrii
Published: December 2022

The paper contains generalization and development of approaches, models and research methods for contact interaction of complex shaped bodies. In the case of contact along the surfaces of a close shape there are a number of problems. Firstly, analytical methods are not universally applied. Secondly, with a small gap between the surfaces of the contacting bodies the contribution of the deformation of the intermediate and surface layers to the balance of displacements becomes substantial. Thirdly, the application of traditional numerical methods also sharply increases the contribution of errors in contact surface shape approximation. All these factors bring on the need to develop new approaches, models and methods for the analysis of contact interaction of complex shaped bodies. For this purpose, the apparatus of the theory of variational inequalities is applied to deliver Kalker’s variational principle. In addition, a new principle for deriving multiple models of contact interaction of complex shaped bodies has been developed. It consists in gradually increasing the number of physical factors that are taken into account when building these models. This makes it possible to form a sequence of varied parametric models by taking into account new factors while naturally avoiding conflict situations. Furthermore it ensures inheritance in the sequence of models of different levels. The proposed improved approaches, models and methods are illustrated by the case study of the contact interaction of bodies with the intermediate layers located between them.
Keywords: contact interaction, complex shaped body, finite element method, boundary element method, Kalker’s variational principle, variational inequalities
DYNAMICS OF COMBAT MODULES OF LIGHTLY ARMORED VEHICLES: SIMULATION OF TRANSIENT AND STEADY PROCESSES
Authors: Trotsenko Volodymyr , Nabokov Anatoly , Grabovskiy Andrey , Tkachuk Mykola А. , Khramtsova Iryna , Rikunov Oleh , Vasyliev Anton , Koba Andrii
Published: December 2022

The work describes a general approach to dynamic processes modeling under action of pulsed reactive forces of recoil during firing shots from combat modules weapons. The combat module can be presented as a discrete system; this approach also applies to elements of drive, engine, transmission, etc. They are characterized by a local compact concentration of mass and high rigidity of the structure itself compared to the same armored hull or special elastic elements of suspension system. Then the reaction of this complex mechanical system to the action of dynamic forces is of interest. On the basis of the developed approach to analysis of the dynamic response of the combat module of a lightly armored vehicle equipped with a small-caliber automatic gun to the action of reactive recoil forces, it is proposed to carry out a qualitative analysis on simplified models at the first stage. The influence of a single shot and burst firing on the deviation of the axis of the barrel from the direction to the target is analyzed. For this, a simplified test model was built. Further, on the obtained simplified models, the results are compared with the results of the analysis on more complex models. The introduced piecewise linear approximation dependence of the time distribution of the reactive recoil force makes it possible to parametrize such force distribution with one parameter. As evidenced by the research results, the nature of the response of the studied dynamic system is strongly influenced by the damping level. If the damping level is high, and the frequency of the pulses is not a multiple of the natural oscillations frequency then the influence of individual pulses can be considered in isolation from each other. The characteristic features of the transient and stable modes of movement of lightly armored vehicles combat modules are determined. These qualitative features determine the nature of the response of the dynamic system to the action of a single pulse and to the action of a series of such pulses. The same features are also characteristic of systems with a large number of degrees of freedom, as well as systems with distributed parameters.
Keywords: dynamic system, combat module, lightly armored vehicle, transition process, steady process, integration of differential equations system, reactive recoil forces during firing shots
English electrotechnical terminology and problems of its use by ukrainian specialists
Authors: Honcharov Yevhen , Kriukova Nataliia , Markov Vladyslav , Poliakov Ihor
Published: December 2022

In recent years, the use of English-language electrotechnical terminology has become an integral part of scientific and pedagogical activities in higher education in Ukraine. Writing of scientific articles, monographs, methodical literature and teaching lectures and practical-laboratory classes requires not only knowledge of the English language at a level not lower than Intermediate, but also knowledge of relevant scientific and technical terminology. English is essentially becoming the lingua franca of the modern world, including in the scientific sphere. Therefore, it is quite surprising that there is practically no literature on electrical engineering disciplines in English in the scientific library of NTU "KhPI". In this regard, almost an exception is the study guide, which was written by the former head of the department of electric apparatus of NTU "KhPI", editor-in-chief of the magazine "Electrical engineering and electromechanics" prof. B.V. Klymenko. The manual is actually an English-Ukrainian dictionary on electromechanics. It is based on the International Electrotechnical Vocabulary (IEV). This is a large and important work, but it does not cover all the variety of electrical terminology and electrical engineering terms. The article shows that the IEV contradicts other English-language sources, which itself, to some extent, has internal contradictions. We see that even now there are still some regional differences in terminology and concepts, methods of teaching electrical engineering, due to local traditions. In addition, the language itself is constantly developing, some words become obsolete, some appear. Therefore, work on dictionaries is ongoing, but they are quite naturally forced to lag behind life. Thus, certain difficulties arise when translating into English. You can, however, take the IEV dictionary as a basis with some adjustments based on a few more reliable sources. If some concept does not have a strict correspondence in English-language literature, then the author of the translation takes a certain risk of being unclear, so this concept must be further explained in the text. Undoubtedly, there is a need for further standardization and inter-state terminological consistency in relation to electrical engineering, as well as an updated Ukrainian standard for electrical engineering, which is very urgent.
Wavelet analysis and forecasting of financial time series
Authors: Moroz Volodymyr , Milovska Karyna
Published: December 2022

Models and methods of forecasting financial time series are considered in the work. The main advantages and disadvantages of traditional models and neural networks for forecasting without data preprocessing are analyzed. Wavelet analysis and a recurrent neural network with long short-term memory (LSTM) were applied to predict the exchange rate of cryptocurrency. The obtained results are compared with the results of existing approaches, the efficiency is determined and a solution is proposed. Figs.: 6. Tabl.: 2. Refs.: 13 titles.

Keywords: financial time series, neural networks, forecasting, data preprocessing, wavelet analysis, recurrent neural network with long short-term memory, cryptocurrency exchange rate.
PARAMETRIC CONTROL SYSTEM OF A THREE-PHASE ACTIVE RECTIFIER WITH A FIXED MODULATION FREQUENCY
Authors: Krylov Denis , Kholod Olga
Published: December 2022

The study of the characteristics of active controlled rectifiers – voltage sources (ARVS) is inextricably connected with the issue of using one or another key management algorithm in them. It is known that they are divided into two main groups: algorithms with a variable and with a fixed modulation frequency. Each of them has its advantages and disadvantages, bringing features both to the calculation of the parameters of the power circuit of the converter, and to the choice of the structure of the control system and autoregulation. Control algorithms with a fixed modulation frequency have tangible advantages that simplify the thermal calculation of circuit elements and input filters of the converter. In practice, most often, it is necessary to maintain the offset angle between the current and the voltage of the power network equal to 0, or, in the energy recovery mode – 180 electrical degrees. Parametric control systems cope well with this task. Therefore, is was shown creation and modeling the structure of the parametric control system of the ARVS with a fixed modulation frequency, which allows to form a power network current close to a sinusoid with a zero phase shift with respect to the network voltage in a wide range of changes in the parameters of the circuit and the power consumed by it. The paper examines: the physical prerequisites for the operation of the control system algorithm proposed by the authors, which is built on the principle of generating a PWM generator control signal from the component voltages of the input circuit of the circuit with phase correction of the shift angle of the first harmonic of the network current relative to the supply voltage; principles of formation of signals operating within it; the dependencies justifying the need to apply the technical solutions proposed in the article are built. The simulation results showed that the ARVS, which works with the proposed control system, allows maintaining the specified value of the output voltage and the current close to the sinusoid of the power network with zero phase shift relative to the power supply voltage in a wide range of changes in the parameters of the circuit and the power consumed by it.
INFLUENCE OF CATHODE MATERIAL ON COMBINED CATHODE PROCESSES IN AQUEOUS SOLUTIONS OF IRON(II) SULPHATE
Authors: Kravchenko Kristina , Tulsky Gennady
Published: December 2022

Sulfuric acid is present in many enterprises for metal processing and manufacturing of metal parts. Existing methods of regeneration of spent solutions are not effective, in particular, spent sulfate solutions are neutralized with lye or waste from other industries containing solid carbonates and hydroxides. At the same time, sulfate waste is formed, which requires disposal at special landfills. Electrochemical regeneration of spent solutions of sulfate-acid treatment of steel solves the problem of disposal of such spent sulfate solutions with the inclusion of iron sulfates. The kinetics of combined cathodic processes in aqueous solutions of iron (II) sulfate at a concentration of 0.5 mol.·dm–3 of iron (II) sulfate, depending on the cathode material was studied. The research methodology was as follows: model aqueous solutions with a composition (mol∙dm–3): 0.5 iron (II) sulfate with the addition of 0.5 sulfuric acid and a control solution – 1.0 sulfuric acid were prepared from chemicals of high stage of purification by dissolution in distilled water. The study of the kinetics of combined cathodic processes in model aqueous solutions was carried out by the method of linear voltammetry using the MTech PGP-500 S potentiostat. The auxiliary electrode is platinum. The reference electrode is mercury sulfate. Determination of iron (II) ions in the solution was carried out by the permanganatometric method. Based on the analysis of the obtained current-voltage curves, the effectiveness of the application of electrochemical regeneration of model solutions of iron (II) sulfate with sulfuric acid was established, which makes it possible to cathodically deposit iron in the form of foil or metal powder, and through the course of the anodic process - convert sulfates into sulfuric acid. During this process, oxidation of Fe2+ to Fe3+ takes place at the slightly soluble anode. Therefore, it is proposed to use polymer porous diaphragms to prevent Fe2+ from entering the anode space. Platinum and copper were used as cathode material. The choice of cathode material was based on different electrochemical properties of these metals in relation to the hydrogen reaction. The balance research on the regeneration of the model solution was carried out in a three-chamber electrolyzer. The initial test solution was fed into the middle chamber. The cathodic current density was 0.025 and 0.035 A∙cm–2, the working area of the anode and cathode was 85 cm2. A compact iron deposit was obtained on the cathode with 08X12N10T, which peeled off. The analysis of the cathode deposit showed the presence of 0.065% hydrogen in iron. Output according to the current of iron was 92%. The end of the Tafel section of the course of cathodic reduction of iron with electrochemical control occurs due to Fe2+ concentration limitations and the ohmic resistance of adsorbed hydrogen at the boundary of heterogeneous phases. It is proposed to eliminate these limitations due to electrolyte mixing.
Lack of Protection for Non-Fungible Token (NFT) Creators in Indonesia: A Progressive Legal Study
Authors: Norasari Dina Aidah
Published: December 2022

This article presents a normative legal research that aims to provide legal protection guarantees for creators of Non-Fungible Token (NFT) works from a progressive legal perspective. The research used a statutory approach and concept approach to examine the implications of NFT on the existing legal framework. The results confirm that NFT requires special regulations to protect creators' rights, including revising the Copyright Law and developing regulations to affirm NFT's character. The study recommends that NFT works be included in copyright through extensive and futuristic interpretation, and the government's legal policy should specifically regulate NFT and issue certificates of NFT works to ensure legal protection and certainty. Overall, this research highlights the need for proactive legal responses to technological developments such as NFT, which can have economic value and require legal protection.Highlights: Non-Fungible Tokens (NFT) require special legal protection for creators due to their economic value. Revising Copyright Law and developing regulations to affirm NFT's character are recommended. NFT works should be included in copyright through extensive interpretation and the government should issue certificates of NFT works to ensure legal protection and certainty.
Crypto Asset as a Transaction Tool in the Perspective of Economic Analysis of Law: Legal Consequences and Ius Constituendum
Authors: Ningsih Dita Damayanti Sasmito , Achmad Dimas Hikari , Dewi Elreddian Kusuma , Purnami Yessy Arinta Puji
Published: December 2022

This normative legal research examines the economic and legal aspects of using crypto assets as a means of business transactions in Indonesia. The study uses a concept and legislation approach to analyze the legal consequences of crypto assets as transaction tools in digital business transactions. The research finds that crypto assets can be traded as goods in accordance with existing regulations, but cannot be used as legal tender in digital business transactions. Any digital transaction that uses only crypto assets as currency is null and void, and subject to criminal sanctions. To regulate the use of crypto assets as transaction tools, the study suggests breaking down the substance of Bappebti Regulation into two characters, regeling and beshikking. The implication of this research is that further studies and proposals are needed from Bappebti to determine whether crypto assets can be used as currency in the future, and to ensure that future regulation aligns with the principles of Economic Analysis of Law.

Highlights:

Crypto assets can be traded as goods in accordance with regulations.

Crypto assets cannot be used as legal tender in digital business transactions.

Regulation of crypto assets as a transaction tool needs to be further developed and clarified.
Analysis Of Machine Maintenance Using Markov Chain Method For Reducing Maintenance Cost
Authors: Pratama Setya Adi , Putra Boy Isma
Published: December 2022

PT. Steel Pipe Industry of Indonesia, Tbk. (SPINDO Unit IV) is a company engaged in manufacturing welding spiral pipe production. In 2021 there was an increase in maintenance costs compared to 2020, which in 2020 amounted to Rp 3.051.800.000 to Rp 3.299.400.000 in 2021, which mean an increase of Rp 247.600.000 or 8%. Based on those problems, the purpose of this study is to determine the policies that should implemented to reduce maintenace costs. The method used is markov chain method. By using the markov chain method, it can be determined the best policy that can lead to lower maintenance costs, whether preventive maintenance or corrective maintenance. So that the company can determine the best maintenance policy for the future. The result obtained from using the markov chain method for this research are that the results can saving of Rp 680.000.000 compared to initial maintenace costs.
Modal Sosial Kelompok Tani Lengkuas Dalam Meningkatkan Perekonomian Masyarakat Rubaru Sumenep Madura
Authors: Fadilatur Rahmah , Satriyati Ekna
Published: December 2022

Abstrack   Farmer cluster formation is to be effort for reaching the aim and also as way to share their opinion each other and their experience each other. Indirectly farmer cluster formation is a tool of social financial capital.it is because farmer cluster formation obtains society solidarity. The important quintessence in social financial capital is not only focus on the success which fixed by the farmer cluster it self but also from each person in that cluster. As well as society at Kaleleng village which majority society’s profession is as a farmer specifically in ginger plant that from farmer cluster. But, day by day society participation is lowering and it influence to their agriculture. The aim of this writing is to give information to the readers that social financial capital which formed by farmer cluster at Kaleleng village has important role in increasing society economy. It means society participant for optimizing farmer cluster in increasing economy collectively. This research is qualitative research in descriptive analytic by using society unit analysis which has a role in farmer cluster activity.
Inquiry Learning Model to Improve Student's Critical Thinking in the Themes Learning Technology Development in Class III SD IT Bina Insan Batang kuis
Authors: Mawarni Dina , Hidayat Hidayat
Published: December 2022

This study aims to determine the success of the application of the inquiry learning learning model in increasing students' critical thinking in thematic learning of Theme 7 Technology Development in class III SD IT Bina Insan Batang Kuis. The design of this research is the Classroom Action Research (CAR) model of Kemmis and Mc. Taggart is a collaborative research conducted in 3 cycles. The data collection instruments were in the form of tests, observations, and interviews. Data analysis techniques in this study using qualitative and quantitative data. Based on the results of the study, it is known that before being given action in class, the percentage of critical thinking students is 35%, meaning that 9 out of 26 students who achieve a completeness score above the KKM 70. So the researchers took action by applying the inquiry learning model. The results of the application of the inquiry learning model run optimally as evidenced by the teacher's observations in the first cycle of 73.33 (enough), the second cycle increased by 83.33 (good) and experienced an increase in the third cycle of 93.33 (very good). The results of the first cycle of student observations from 66.66 (enough) to 87 (good) in the second cycle and obtained an increase of 90 (very good) in the third cycle. Students' critical thinking by applying the inquiry learning model to the first cycle, which obtained a completeness percentage of 53.84% (not critical), the second cycle increased to 84.61% (critical), and increased in the third cycle by 92.30% (very critical). The results of the research that researchers have done, can be seen in the acquisition of data from the cycle has increased. Thus it can be concluded that applying the inquiry learning model in thematic learning of Theme 7 Technology Development in class III SD IT Bina Insan Batang Kuis can improve students' critical thinking.  Therefore, it is suggested that teachers can apply the inquiry learning model with the aim of improving students' critical thinking.