bluuebunny/crossref_metadata_2025 huggingface dataset:
Role of radiotherapy in the treatment of locally advanced penile cancer
Authors:   Department of Oncology, University Hospital Center Osijek, Osijek, Croatia, Šambić-Penc Mirela ,   Faculty of Medicine, University of J.J. Strossmayer Osijek, Osijek, Croatia, Perić Luka , Canjko Ivana , Kovač-Barić Maja , Kotromanović Darko , Flam Josipa
Published: December 2022

Penile cancer is a rare but aggressive tumor, most commonly squamous cell carcinoma. Treatment modalities depend on the stage of the disease, but the backbone of treatment is surgical resection of the primary tumor and regional lymph nodes with the use of neoadjuvant/adjuvant chemotherapy and radiotherapy. Our case report is about a 59-year-old patient which was presented with bilateral inguinal lymphadenitis, scrotal and penile edema. A biopsy of the change in the penis confirmed squamous cell carcinoma. Partial amputation of the penis and an excisional biopsy of the inguinal lymph nodes was performed, which confirmed the metastasis to the lymph nodes. Diagnostic imaging revealed bilateral enlarged inguinal lymph nodes which were later surgically removed. Postoperative CT scan showed three suspected lung metastases. The patient was then treated with polychemotherapy. Follow-up CT scan showed complete regression of metastatic changes in the lungs but also showed local recurrence in the area of the penile root. Radiotherapy with concomitant administration of cisplatin was conducted. Penile cancer is an aggressive disease that can be cured at an early stage if adequate treatment is applied. We highlight the importance of a multimodal and multidisciplinary approach consisting of polychemotherapy, surgical treatment, and radiotherapy.
EMG-Based Grasping Force Estimation for Robot Skill Transfer Learning
Authors:   ITMO University, Ali W. ,   ITMO University, Kolyubin S.
Published: December 2022

In this study, we discuss a new machine learning architecture, the multilayer preceptron-random forest regressors pipeline (MLP-RF model), which stacks two ML regressors of different kinds to estimate the generated gripping forces from recorded surface electromyographic activity signals (EMG) during a gripping task. We evaluate our proposed approach on a publicly available dataset, putEMG-Force, which represents a sEMG-Force data profile. The sEMG signals were then filtered and preprocessed to get the features-target data frame that will be used to train the proposed ML model. The proposed ML model is a pipeline of stacking 2 different natural ML models; a random forest regressor model (RF regressor) and a multiple layer perceptron artificial neural network (MLP regressor). The models were stacked together, and the outputs were penalized by a Ridge regressor to get the best estimation of both models. The model was evaluated by different metrics; mean squared error and coefficient of determination, or $r^{2}$ score, to improve the model prediction performance. We tuned the most significant hyperparameters of each of the MLP-RF model components using a random search algorithm followed by a grid search algorithm. Finally, we evaluated our MLP-RF model performance on the data by training a recurrent neural network consisting of 2 LSTM layers, 2 dropouts, and one dense layer on the same data (as it is the common approach for problems with sequential datasets) and comparing the prediction results with our proposed model. The results show that the MLP-RF outperforms the RNN model.
A singularidade histórica do anarquismo em Portugal
Authors: Ferreira José Maria Carvalho
Published: December 2022

Por particularidades  subjacentes à história singular de Portugal, pode-se afirmar que a plasticidade social do anarquismo em Portugal foi, particularmente, evidente no período de finais do final do século XIX até ao início da década de 1920. Os fatores básicos  que estão na origem desse potencial residem num movimento social operário reivindicativo e revolucionário assente no anarco-sindicalismo.  Com a revolução russa de 1917 e o golpe militar de 1926 traduzido, mais tarde,  na ditadura salazarista em 1933, pode-se dizer que a pujança . demonstrada pela CGT (Confederação Geral do Trabalho)  anarco-sindicalista se sindicalista revolucionária soçobra na prisão e na clandestinidade. Por outro lado, é necessário ter presente que a validade heurística da revolução russa transformou muitos desses militantes anarco-sindicalistas em arautos da constituição de Partidos Comunistas nos seus países obedecendo aos imperativos das 21 condições da Internacional Comunista sedeada em Moscovo. Submetidos pela força da clandestinidade e as prisões da ditadura salazarista, o anarquismo em Portugal limitou-se a um processo de total atomização e pouca visibilidade social. Com a revolução de 25 de Abril de 1974 em Portugal ressurgiu com alguma pujança no meio editorial, com o ressurgimento do jornal “A Batalha” e dezenas de uma diversidade de publicações. O anarco-sindicalismo não emergiu e muitas das publicações criadas, entretanto, já desapareceram. Hoje, em Portugal, denota-se que o anarquismo tende a desenvolver-se fundamentalmente nos circuitos culturais e nos meios em que predomina utilização de meios virtuais analítico-simbólicos.
VIVIR Y MORIR CANTANDO: LA MÚSICA EN EL PENTECOSTALISMO CHILENO
Authors: Mansilla Miguel Ángel , Orellanas Zicri
Published: December 2022

RESUMEN: El objetivo de este artículo es describir e interpretar el rol de la música en el pentecostalismo chileno, para destacar su relevancia en el fundacionalismo, su imaginario literario y su importancia y significados en los espacios y tiempos mortuorios, velatorios y postmortuorios. Nuestro abordaje, nos permite poner atención en la percepción de las realidades musicales, en los sentimientos musicales que transmite un individuo perteneciente a un determinado grupo y los sentimientos musicales que produce condicionado por las enfermedades, el dolor, la muerte, la pérdida y/o la miseria. Desde lo metodológico trabajamos con la revista Fuego de Pentecostés, perteneciente a la Iglesia Evangélica Pentecostal. Así mismo, incluimos dos novelas cuyos autores incorporan en sus narrativas personajes pentecostales y donde se destaca el rol de la música en cultura religiosa del movimiento. Ambas fuentes nos permiten enriquecer y complementar el rol de la música en el pentecostalismo.
PALABRAS CLAVE: Música. Pentecostalismo. Muerte. Simmel.
Reseña bibliográfica
Authors: Méndez Juez Marta
Published: December 2022

El envío es una reseña bibliográfica
Post-Transcriptional Modification by Alternative Splicing and Pathogenic Splicing Variants in Cardiovascular Development and Congenital Heart Defects
Authors: Mehta Zubin , Touma Marlin
Published: December 2022

Advancements in genomics, bioinformatics and genome editing have uncovered new dimensions in gene regulation. Post-transcriptional modifications by the alternative splicing of mRNA transcripts are critical regulatory mechanisms of mammalian gene expression. In the heart, there is an expanding interest in elucidating the role of alternative splicing in transcriptome regulation. Substantial efforts have been directed towards investigating this process in heart development and failure. However, few studies have shed light on alternative splicing products and their dysregulation in congenital heart defects (CHDs). While elegant reports have shown the crucial roles of RNA binding proteins (RBPs) in orchestrating splicing transitions during heart development and failure, the impact of RBPs dysregulation or genetic variation on CHDs has not been fully addressed. Herein, we review the current understanding of alternative splicing and RBPs’ roles in heart development and CHDs and discuss the impacts of perinatal splicing transition and its dysregulation in CHDs. We further summarize discoveries made of causal splicing variants in key transcription factors that have been implicated in CHDs. Improved understanding of the roles of alternative splicing in heart development and CHDs may potentially inform novel preventive and therapeutic advancements for newborn infants with CHDs.
Reducing N-Nitrosamine Content in Grilled Pork Steaks Marinated with Selected Strains of Lactic
Authors: Juknienė Ignė , Stepankevičienė Anita , Gustiene Sonata , Jankauskienė Agnė , Salomskiene Joana , Riešutė Reda , Stimbirys Artūras , Zaborskienė Gintarė
Published: December 2022

The results show that seven types of N-nitrosamines: N-nitrosodiethylamine (NDEA), N-Nitrosopiperidine (NPIP), N-nitrosodimethylamine (NDMA), N-nitrosopyrrolidine (NPYR), N-nitrosodipropylamine (NDPA), N-nitrosodibutylamine (NDBA) and N-nitrosodiphenylamine (NDphA) were reduced after heat treatment of pork steaks marinated with L. plantarum MI-LP1, S. carnosus LM-SC1, S. vitulinus LM-SV1. Selected LAB suppressed the formation of putrescine and spermine, lowered acid and peroxide values, which were signiﬁcantly lower than in the control samples, then P≤0.05 in all cases. The nitrites and nitrates amounts were significantly decreased in pork steaks samples marinated with L. plantarum MI-LP1 and S. carnosus MI-SV1 strains. These results presented that selected lactic acid bacteria could be used for marinating pork steaks to improve quality characteristics and reduce N-nitrosamine formation during grilling.
High Resolution Magnetoelectric Sensor and Low-frequency Measurement using Frequency up-conversion Technique
Authors: Sun Kunyu , Jiang Zhihao , Wang Chengmeng , Han Dongxuan , Yao Zhao , Zong Weihua , Jin Zhejun , Li Shandong
Published: December 2022

Magnetoelectric (ME) sensor is a new type magnetic sensor with ultrahigh sensitivity, low power consumption, and suitable for the measurement of low frequency weak magnetic field. In this study, metglas/PZT-5B ME sensor with a mechanical resonance frequency f_res of 60.041 kHz was prepared. It is interesting to note that its magnetic field resolution reaches 0.20 nT at f_res and 0.34 nT for DC field, respectively. In order to measure the ultralow frequency AC magnetic fields, a frequency upconversion technique was employed. Under this technique, a limit of detection (LOD) of AC magnetic field lower than 1 nT at 8 Hz is obtained, and the minimum LOD of 0.51 nT is achieved at 20 Hz. The high resolution ME sensor with sub-pT level is promising in the field of low frequency weak magnetic field measurement technology.
LIBGRPP: A Library for the Evaluation of Molecular Integrals of the Generalized Relativistic Pseudopotential Operator over Gaussian Functions
Authors: Oleynichenko Alexander V. , Zaitsevskii Andréi , Mosyagin Nikolai S. , Petrov Alexander N. , Eliav Ephraim , Titov Anatoly V.
Published: December 2022

Generalized relativistic pseudopotentials (GRPP) of atomic cores implying the use of different potentials for atomic electronic shells with different principal quantum numbers give rise to accurate and reliable relativistic electronic structure models of atoms, molecules, clusters, and solids. These models readily incorporate the effects of Breit electron-electron interactions and one-loop quantum electrodynamics effects. Here we report the computational procedure for evaluating one-electron integrals of GRPP over contracted Gaussian functions. This procedure was implemented in a library of routines named LIBGRPP, which can be integrated into existing quantum chemistry software, thus enabling the application of various methods to solve the many-electron problem with GRPPs. Pilot applications to electronic transitions in the ThO and UO2 molecules using the new library and intermediate-Hamiltonian Fock space relativistic coupled cluster method are presented. The results clearly demonstrate that rather economical tiny-core GRPP models can exceed in accuracy relativistic all-electron models defined by Dirac-Coulomb and Dirac-Coulomb-Gaunt Hamiltonians.
Bellman's, Knut's, Lupanov's, Pippenger's problems and their variations as generalizations of the addition chain problem
Authors: Kochergin Vadim Vasil'evich
Published: December 2022

We consider various generalizations of the effective exponentiation problem, also known as the addition chains problem in additive terminology. We attempt to evaluate and consistently compare the results and the methods that were used to obtain them. The considered generalizations are complexity problems (i.e. finding the minimum number of required operations) for the computation a monomial of many variables, a set of powers, elements of finite Abelian groups, elements of free semigroups, systems of monomials, systems of integer linear forms, systems of elements of free Abelian groups along with some other problems. For all these directions of research we overview both the classical results and the results of the author and his followers.
Circuit complexity lower bound for parity function in one infinite basis
Authors: Kombarov Yuri Anatol'evich
Published: December 2022

The paper is devoted to realization of parity functions by circuits consisting of generalized conjunctors of infinite fan-in. We present a new circuit complexity lower bound for parity function in this model.
Approach to the Selection of Optimal Characteristics for Low Pressure Turbines Using a Single Gas Generator
Authors: Khomylyev Sergiy , Kravchenko Igor , Popuga Andriy
Published: December 2022

An approach to the conceptual design of the low pressure turbine for the aviation turbopropeller engine has been shown. The engine is created on the basis of the single gas generator for the two-engine power plant intended for the average transport aircraft. This approach is of great interest because in addition to the efficiency factor, the mass of the designed turbine, the fuel mass and the number of aerodynamic profile were used as optimal design criteria. The designed turbine includes the two stages and the interturbine transition channel of a diffuser type arranged in front of them. Consideration was given to the four flow parts of the turbine that differ by the diameter and the height selected in the preset limitation range. The gas dynamic efficiency of the interturbine transition channel, gas dynamic efficiency of the after-turbine channel, the strength of the turbine blade of the last stage were taken as the limitations. The dependences of the efficiency factor, the turbine mass and the number of turbine blades on the turbine aerodynamic load factor were obtained for the four turbine options. The turbine efficiency factor was determined using our own method of one-dimensional gas-dynamic computation. The fuel flow rate was determined using the mathematical engine model. The turbine mass was determined using the parametric method as a function of the aerodynamic load factor and the turbine flow rate factor. The number of aerodynamic profiles was defined using the Zweifel parameter. It was shown that the use of heavy loaded and less loaded low pressure turbines can reduce the take-off weight of the aircraft in spite of an increased fuel flow rate.
About the Effect on the Environmental Efficiency of the Centralized Heat Supply Systems
Authors: Voinov Oleksandr , Elkin Yuriy
Published: December 2022

The global production created by the mankind has an intensively increasing harmful effect on the environment. As a result, we are facing the problem of the saving of natural environment and now the global community tries to find solution for this environmental problem. The power generation sector is the most environmentally aggressive of all industry branches. Technical power engineering facilities differ by a high degree of complexity making it difficult to increase the level of their environmental friendliness. In particular, centralized heat supply systems are rather complicated and responsible components of the power engineering industry. These differ by a high level of environmental aggressiveness. Hence, these need to increase a degree of their environmental friendliness. The purpose of this research was to analyze the condition of the interaction of the power generating sector with the natural environment and search for harmonization solutions of available contradictions of such an interaction. An increase of the environmental friendliness of the worn-out power equipment used by centralized heat supply systems is a topical problem. The purpose of this scientific paper was to suggest a solution for the problem of the environmental interaction of the centralized heat supply systems with natural environment using an approach of their partial renewal. The most environmentally aggressive elements of these systems are the boiler plants that emit heat and harmful substances into the environment. Domestic boiler plants have completely been worn-out. Therefore, the development of the domestic boiler building industry is of vital importance. It will enable the production of modern boiler plants instead of worn-out boiler systems. This process is impeded at the moment by the insufficiency of available resources. Contemporary requirements to the technological level of the functioning efficiency of the centralized heat-supply systems are rather high, especially as for its environmental component. Available centralized heat-supply systems have low efficiency due to a high wear-out level of their elements on the whole. There is an urgent need for an increase in the efficiency of these systems. One of the available ways of such an increase in the efficiency is a partial renewal of the equipment. The program of the partial renewal of available boiler plants allows us to provide an appropriate increase in the environmental friendliness of the worn-out equipment used by centralized heat-supply systems. The coverage of the entire fleet of the equipment available for the centralized heat-supply systems by this partial renewal program will allow for an increase in the level of its ecological friendliness on the whole.
CALCULATION AND EXPERIMENTAL JUSTIFICATION OF DESIGN AND TECHNOLOGICAL SO-LUTIONS OF POWER HYDRAULIC CYLINDER ELEMENTS
Authors: Veretelnyk Oleg , Hrechka Iryna , Voloshina Iryna , Tkachuk Mykola M. , Loznyi Oleg , Tkachuk Mykola А. , Saverska Mariia , Kutsenko Serhii , Tretyak Vladeslav
Published: December 2022

The paper describes studies of the stress-strain state of power hydraulic cylinders elements. Geometric dimensions of casing and properties of materials are chosen as varied parameters. The controlled values are the levels of stresses and displacements. The criteria are weight, strength and rigidity. These characteristics determine the technical characteristics of power hydraulic cylinders. Dependences of criterion characteristics on varied parameters are established. On this basis, recommendations for substantiation of design and technological solutions of power hydraulic cylinders elements are developed. This made it possible to develop a project and technology for the manufacture of power cylinders with low material consumption. In addition, increased efficiency is provided due to the use of antifriction coating on the inner surface of cylinder. The stress level in the main material of cylinder body is limited. The strength of the area of the brazed joint material and the plastic lining layer is also ensured. A special configuration of the sealing ring is used to reduce the level of losses in the movable connection of the piston with the hydraulic cylinder body. At the same time radial displacements of the cylinder body provide acceptable contact of the moving and fixed parts of the hydraulic cylinder. In general, balanced design and technological solutions of power hydraulic cylinders elements are substantiated. They provide high technical characteristics of power hydraulic cylinders. It also increases the technological level of their production and reduces the total cost. Power hydraulic cylinders with reasonable parameters are used in the elements of technological systems.
Keywords: hydraulic cylinder; finite element method; stress-strain state; computational-experimental justification
ARMORED HULLS OF DOMESTIC ARMORED PERSONNEL CARRIERS: COMPUTER AND MOCK-UP MODELING OF DYNAMIC PROPERTIES
Authors: Grabovskiy Andrey , Vasyliev Anton , Tkachuk Mykola M. , Voloshina Iryna , Loznyi Oleg , Tkachuk Mykola А. , Khramtsova Iryna , Kokhanovska Olha , Peleshko Yevhen , Nabokov Anatoly , Trotsenko Volodymyr
Published: December 2022

At the stage of design research of armored bodies of lightly armored vehicles it is extremely important to determine the range of their natural frequencies and natural forms of oscillation. For this purpose, the finite element method is usually used. It is necessary to substantiate the parameters of the finite element model, which provide an acceptable level of accuracy of numerical modeling of dynamic properties of this type of structures. For this purpose, data from parallel numerical and experimental studies of the mock-up of the armored hull of the armored personnel carrier are used. The mock-up of the upper projection of the armored hull is made in the appropriate scale. The material is sheet steel. This mock-up is subjected to dynamic excitation on a vibrating table. Resonant excitation frequencies are recorded, as well as the natural vibration forms. Shock-pulse excitation of the armored hull’s mock-up was also performed. The response to this excitation is recorded using accelerometers. Then, the spectrum of natural vibration frequencies is determined from these oscillograms. In parallel, numerical modeling of natural frequencies and natural vibration forms of the armored hull’s mock-up is carried out. After that, the results of numerical and experimental studies are compared. By varying the parameters of the finite element model, a satisfactory correspondence between the results of numerical calculations and experimental measurements is achieved. In particular, the following are determined: the acceptable type of used finite elements; the number of finite elements required to satisfy the accuracy of numerical modeling of the dynamic properties of similar structures; zones of the recommended thickening-rarefaction of a grid of finite elements, etc. According to the research results, the parameters of finite-element models have been established, which can be used to study the dynamic processes and properties of full-scale armored hulls of lightly armored vehicles.
Keywords: lightly armored vehicle, mock-up, natural frequency, spectrum of natural vibration frequencies
CALCULATION AND EXPERIMENTAL RESEARCH OF TANK HYDRAULIC TRANSMISSION LAYOUT
Authors: Grabovskiy Andrey , Tretyak Vladeslav , Voloshina Iryna , Tkachuk Mykola М. , Marusenko Svitlana , Serykov Volodymyr , Hrechka Iryna , Tkachuk Ganna , Zarubina Alla , Vasiliev Anton , Stakhovskyi Oleh
Published: December 2022

In order to substantiate the advanced technical solutions of radial hydrovolume transmissions, it is necessary to study the stress-strain state of their most responsible and loaded elements. In particular, it is of interest to determine the rational parameters of cylinder block, which is subject to significant pressure of working fluid. This leads to the formation of a stress-strain state with a high level of stresses and elastic displacements. They can be dangerous in terms of strength, rigidity and performance of the hydraulic transmission in general. To carry out numerical studies of the stress-strain state of cylinder block of hydrovolume transmission at the design stage, finite element models with varied parameters are developed. However, at this stage of research, it is desirable to have a verified numerical model. For this purpose, the paper describes the computational and experimental studies of the layout of the cyclic part of the hydrovolume transmission cylinder block. On the one hand, these studies were performed using the experimental method of holographic interferometry. On the other hand, calculations were performed using the finite element method. In the course of comparison of the received results, the finite element model parameters are determined which provide high accuracy of the stress-strain state calculation of hydrovolume transmissions cylinder block.
Keywords: stress-strain state; hydrovolume transmission; finite element method; cylinder block
DEVELOPMENT OF ORGANIZATIONAL AND TECHNICAL METHOD OF COMPATIBLE FORECASTING AND ENSURING READINESS TO RESPOND TO EMERGENCIES
Authors: Ivanets Hryhorii , Ivanets Mykhailo , Horielyshev Stanislav , Baulin Dmitro , Sydorenko Iryna
Published: December 2022

Nowadays emergency prevention should be considered as a complex compatible process of predicting emergencies and early response to the threats of their occurrence or mitigation of possible consequences. This implements a systematic approach to this problem solving in order to prevent their occurrence or minimize possible consequences of them. The organizational and technical method of compatible forecasting and ensuring the readiness to respond to emergencies in real conditions has been developed. This method is based on a formalized mathematical model of compatible forecasting and ensuring the readiness of civil protection units to respond to emergencies. It provides for the forecasting of emergencies, possible losses caused as a result of them and the comprehensive provision of readiness of civil protection units respond to possible threats. The control algorithm for the implementation of the organizational and technical method of compatible forecasting and ensuring the readiness of responding of civil protection units to emergencies has been developed. Its use involves the implementation of a number of interconnected procedures. Firstly, the collection, formalization and analysis of information about emergencies are carried out. Then the complexity of civil protection units with armaments and equipment and their readiness, as well as the staffing of civil protection units by personnel, are taken into consideration. These procedures ensure the emergencies prediction and readiness to possible threats respond. The received information is taken into account when justifying and forming a decision on the actions of civil protection units to adequately respond and eliminate the consequences of emergencies. The correction of emergency solutions, based on the analysis of the effectiveness of response units actions, is carried out.

Keywords: formalized mathematical model, organizational and technical method, control algorithm, emergency, losses from emergencies, level of readiness
THEORETICAL BASIS FOR ADVANCED SOLUTIONS OF HIGH RPM ELEMENTS OF CIVIL AND MILITARY MACHINES BASED ON STRENGTH AND DYNAMIC STABILITY CRITERIA
Authors: Tkachuk Mykola А. , Grabovskiy Andrey , Tkachuk Mykola M. , Klochkov Illia , Prokopenko Mykola , Tretyak Vladeslav , Voloshina Iryna
Published: December 2022

In modern conditions, one of the significant obstacles to ensuring increased power, efficiency and resource of military and civilian vehicles is the exhausted possibilities of traditional technical solutions of basic elements and systems. This primarily applies to high-speed elements, in particular, turbines and rotary parts of air blowers of internal combustion engines, transmissions, drives, hydraulic machines and more. High speeds cause dynamic processes that can potentially lead to problems with strength, rigidity and stability. In order to substantiate the progressive technical solutions of high-speed parts, it is necessary to develop appropriate theoretical foundations for the analysis of processes that occur in these elements. The stress-strain state of the elements of rotor systems is of particular interest. It is also important to determine the stiffness properties of the elastic supports. In turn, this affects the stability of the rotor systems. This creates a basis for establishing patterns of influence of variable parameters on the characteristics of dynamic processes and states. A complex mathematical and numerical models of the stress-strain state and stability of motion of high-speed structural elements is developed on a unified  methodological basis. These models are described by a common set of varied parameters. General criteria and restrictions are formulated. The search for advanced solutions is carried out by meeting certain complex criteria and constraints. Design parameters and operational modes are varied. The analysis problems are solved using a unified parametric model.
Keywords: civil and military machines, RPM structural parts, stress-strain state, critical rotational velocity
ASSESSMENT OF THE INFLUENCE OF DIFFERENT FORMS OF FRAME STRUCTURE FOR ITS STRENGTH
Authors: Yarmak Mykola , Gliebov Vasyl , Nefodov Anatolii , Dashkov Dmytro , Kasyan Roman , Slyvar Evgen
Published: December 2022

The article sets the task of optimizing the frame structure in order to reduce its own weight, taking into account the identification of the occurrence of a destruction factor. The search for a solution is carried out using evolutionary modeling, which in turn includes the choice of a mechanical model and a numerical model. The computational scheme includes the following main stages: finding, on the basis of optimal design, a design option that meets the requirements of the customer, performing calculations of this object in a static formulation under conditions of local damage, implementing a sequence of evolutionary syntheses of the structure when performing calculations of deformations of damaged systems. Based on the results of this check, the initial assumptions for the calculation can be corrected and the optimization procedures can be repeated. The calculation in a static setting is implemented within the framework of the deformation theory of elasticity, taking into account the influence of external loads. This task was implemented using the modern ANSYS software package. Thus, a comparison was made of various versions of the load-bearing frames of wheeled vehicles. The influence of the shape and weight of the structure on the strength under certain types of loading is determined. It is shown that when applying a certain type of design optimization, it is possible to increase the strength of the structure with an additional reduction in its weight.
Keywords: Ansys, frame structure, 3D model optimization, static problem, elasticity theory, weight optimization, structural strength, finite elements
DESIGN PARAMETERS AND OPERATION CHARACTERISTICS OF BALL-TYPE SAFETY-OVERRUNNING CLUTCH WITH MODIFIED GROOVES
Authors: Protsenko Vladyslav , Malashchenko Volodymyr
Published: December 2022

The article investigates the force interaction of the elements and operation characteristics of a ball-type safety-overrunning clutch with modified semi-clutch grooves. Grooves modification provided through grooves sides to the semi-couplings radius inclination. Through balls with other clutch parts force interaction consideration, taking into account inertia and friction forces, obtained expressions for calculating of clutch parts loadings, main moments of the clutch: rating, operation beginning and ending. Those make possibility to evaluate main clutch operation characteristics - coefficients of accuracy, sensitivity, and rating torque exceeding. Influence of main design parameters on clutch operation characteristics is studied. Particularly it is shown that grooves to clutch axe inclination angle exerts a great influence on parts load and clutch operation characteristics in overload mode. It is shown that in highly loaded high-speed drives it is advisable to install clutches with inclined to the radius grooves sides. It is shown that from the point of view of increasing clutch operation characteristics, it is more advantageous to make the grooves at smaller angles to the clutch axe. It is established that characteristics of clutch with inclined to the radius grooves sides are not very sensitive to changes in operation rotating frequency. Reducing the balls diameter makes a positive effect on the clutch operation characteristics in overload mode through inertia and friction forces impact decreasing and reducing contact stresses in balls with grooves contact zone. Practically significant ratios for the design and verification calculations of presented clutch parts loads and stresses are obtained. Presented results are useful for engineers dealing with mechanical driving design.
Keywords: clutch, torque, overload, gearing, stress, operation accuracy, contact strength, operation characteristics
Laboratory stand for researching the modes of operation of the frequency converter of a three-phase asynchronous motor with a short-circuited rotor
Authors: Chepeliuk Oleksandr , Pozhidaev Volodymyr
Published: December 2022

A laboratory stand was developed for researching the modes of operation of a frequency converter for controlling a three-phase asynchronous motor with a short-circuited rotor with a voltage of 380-400 V. The design of the laboratory stand and its electrical circuit are described. Methodical instructions for carrying out laboratory work on the study of operating modes of the frequency converter have been developed. The composition and structure of methodical instructions are given. In the electronic version of the developed methodological instructions, a hyperlink to the technical documentation of the investigated frequency converter on the Internet is used. To demonstrate the capabilities of the laboratory stand, separate results of research into the modes of operation of the frequency converter are presented.
Starting winding parameters influence on starting characteristics of salient-pole synchronous motor
Authors: Khai Mykhailo , Kharchyshyn Bohdan
Published: December 2022

The asynchronous method of starting a salient-pole synchronous motor (SPSM), its starting characteristics, which are the dependence of the current I of the stator and the electromagnetic moment  M to the slip s at constant stator winding feed voltage U and frequency f have been analyzed. A mathematical model that considers magnetic and electrical asymmetry was designed. The magnetic asymmetry of the SPSM is cased by the salient-pole structure of the rotor, and the electric - due to the different number of windings along the longitudinal and transverse axes. To consider the magnetic and electrical asymmetry of SPMS carry out the following transformations: 1) replacing of the three-phase stator winding with two-phase, where the magnetic axis of one of the windings coincides with the longitudinal axis d, and the magnetic axis of the second winding - with the transverse axis q of the fixed coordinate of the orthogonal system dq; 2) the starting short-circuited winding is replaced by two windings: a longitudinal starting winding, the magnetic axis of which coincides with the d-axis, and a transverse starting winding, the magnetic axis of which coincides with the q-axis; 3) the movable rotor of the engine is considered stationary. The developed mathematical model showed that the starting properties of SPSM and the type of its starting characteristics depend on both: the parameters of the stator windings and the parameters of the rotor windings - the starting winding and the excitation windings. During the SPSM design process, the specified starting properties can be achieved by the variation of the starting winding parameters, which depend on the number of rods, sizes, and materials of rod and short-rings, as well as the size (width and height) of the slot groove. A computer program for calculating its starting characteristics with a given set of parameters for researching SPSM according to the described mathematical model was developed.
ECONOMIC EVALUATION OF AIR POLLUTION INDICATORS BY SOLID FUEL LOCAL BOILER ROOMS
Authors: Braverman Vyacheslav , Krutoholova Iryna
Published: December 2022

In Ukraine, the losses from air pollution in 2020 amounted to 10.42 billion US dollars, or 6.7% of GDP (gross domestic product). Up to 83% of all emissions of pollutants into the atmosphere of Ukraine are accounted for by the electricity industry from the combustion of all fuels. According to the State Statistics Committee of Ukraine, 15233 settlements in rural areas are heated by coal. Due to the fighting in eastern Ukraine, energy (long-flame gas) coal began to enter the private sector and the public sector for heating with local solid fuel boilers. No other fuel pollutes the atmosphere like long-flame coal. The paper shows that for some types of emissions from the combustion of fossil coal is ten times higher than the maximum allowable concentrations. The largest exceedances of the maximum permissible concentration of 5300 times in carbon dioxide (CO2) and sulfur dioxide (SO2) in 168.8 times, as well as nitric oxide NO2 in 6.1 times. In addition, the emission of benzo (a) pyrene from coal combustion is 0.27 g / GJ. Therefore, it is impossible to solve the environmental problems of decarbonization in Ukraine without taking into account emissions from local low-power solid fuel boilers. We propose to replace fossil long-flame coal in local solid fuel boilers with biochar made from agricultural waste. Such a solution would significantly reduce emissions of pollutants and solve the problem of agricultural waste disposal. The practical use of the proposed technology is constrained by the cost of biochar production, which is higher than that of fossil coal. It is shown that the decision to replace fossil coal with biochar must also take into account the impact of pollutants on the environment and human health. The paper estimates the losses from pollution by one solid fuel boiler of the environment, which amount to UAH 333,000, and the economic damage from pollution by one solid fuel boiler on human health, which amounts to UAH 640,000. In this case, the replacement of fossil coal with biochar is very cost-effective.
TECHNOLOGICAL REENGINEERING OF PRODUCTION INFRASTRUCTURE OF INDUSTRIAL ENTERPRISES AND MODERN INVESTMENT POLICY IN UKRAINE
Authors: Popov Alexander , Fadeev Valeriy , Mekhovych Serhiі
Published: December 2022

The article outlines the conceptual issues of technological reengineering of problematic machine-building enterprises. Special attention is paid to production reengineering as the most attractive mechanism of innovative transformations. The essence and types of reengineering components are considered. Technological reengineering is offered as the basic tool of restoration of the domestic machine-building enterprises which have suffered during a pandemic and the military conflict in Ukraine. Investment policy is seen as the basis for transformation. It is noted that the main problems in the economy of Ukraine and, in particular, in machine-building enterprises are not limited to business processes, but rather lie in the plane of the principles of formation and functioning of modern technological processes. The solution to the problem of accelerating the development of new industries should be sought in the integrated use of innovation methodology. Accordingly, technological reengineering is considered as an effective mechanism for rehabilitation of problem enterprises based on a radical change in the technologies used. It should be carried out in combination with innovative engineering, organizational redesign of production relations and management system, social reengineering, business process reengineering and logistics reengineering. In fact, we are talking about purposeful innovative transformations in the production and technological sphere of competitively problematic enterprises.
REPLACEMENT OF COAL AND GAS WITH ALTERNATIVE SOURCES OF ENERGY
Authors: Krutoholova Iryna , Braverman Vyacheslav
Published: December 2022

The work shows that agricultural waste can be an inexhaustible cheap source for green, renewable energy sources such as biocoal, biogas, high-quality organic fertilizer – biochar. The urgency of the problem has increased even more due to the need to replace fossil energy resources (coal, gas, oil), which used to come from Russia. The possibility of using exothermic heat of the process of pyrolysis of agricultural waste makes this process economically more attractive and will contribute to its implementation. When using the proposed pyrolysis technologies, all types of carbon-containing agricultural waste can be considered as an unclaimed resource for the decarbonization of the entire energy sector of Ukraine.
CURRENT DIRECTIONS OF THEORETICAL DEVELOPMENTS REGARDING THE USE OF IRON-BASED ALLOYS
Authors: Lukianova Kateryna
Published: December 2022

The article proves that important achievements of theoretical developments regarding the use of iron-based alloys are the scientific works of domestic researchers. Thus, in the dissertation research of Karpets M.V. for the first time, the phase composition, microstructure and physicо-mechanical properties of alloys of the Сr-Ni-Co-Fe-Cu-Al system in the concentration range (0-3 mol) of the content of chemical elements were systematically investigated. It was established that in the studied system, due to the high entropy of mixing, only simple solid substitution solutions based on fcc and bcc structures are formed, which are characterized by a high complex of physical and mechanical properties that are not inherent to any of the constituent components. It is substantiated that the main factor of phase formation in high-entropy alloys is the value of the average electron concentration of the alloy. The interval of values ​​of the average electron concentration, in which bcc or fcc structures exist, depends on the rate of crystallization of the melt and the presence of elements prone to liquation in the alloy. Stabilizing elements of solid solutions based on phases with bcc (Al, Cr) and fcc (Cu, Ni, Co) structures were established. A significant scientific achievement should be considered the first developed high-entropy CrMnFeCoNi2Cu alloy based on a solid solution with an fcc phase structure, capable of being deformed by rolling at room temperature by 98% without the appearance of cracks or tears. Its phase composition, microstructure, and physical and mechanical properties at all stages of deformation were studied. It is shown that, for the first time in Ukraine, during cold rolling in the high-entropy CrMnFeCoNi2Cu alloy, similar to pure metals and alloys with an fcc structure, a rolling texture with the main component appears. The article provides examples of other theoretical developments regarding the use of iron-based alloys.
PECULIARITIES OF UI TESTING
Authors: Iegorova Irina , Ilchenko Kate
Published: December 2022

The modern development of information technologies significantly affects the formation of demand and causes the appearance of digital products. For any digital product to be successful, a user-centric approach must be taken. User experience research is a key component of this development approach. UX research is the process of finding out how people interpret and use products and services. It is used everywhere from websites to mobile phones, consumer electronics, medical equipment, banking, and more. In UX design, research is a fundamental part of solving relevant problems. Today, when all existing processes are greatly accelerated, users quickly lose loyalty to a product, because they know that there are many other options and do not hesitate to look for them, so a bad user experience with an application, site or product in general can mean the end of the interaction. UX research is very useful for developing a product strategy and algorithmizing solutions that would meet the needs of users. The issues of optimal choice of research methods, both quantitative and qualitative are considered. Both the methods themselves, such as the interview method, focus groups, card sorting, tree testing, preference assessment, eyetracking, proof of concept, A/B testing, and their areas of application are examined. The advantages and disadvantages of the methods, as well as their features, are considered. The method of analyzing hierarchies to calculate criteria such as efficiency, price, time, and sample size was used. Based on the conducted analysis, it was established that the most important criterion when choosing a research method is its effectiveness. Further calculation of the weighted average scores for each decision option allowed to identify the best research methods and provide recommendations for their effective use at different stages of digital product development. Thus, the optimal choice of testing method can significantly improve the quality of the user interface.
DEVELOPMENT OF A SITUATION SYSTEM WITH FUZZY LOGIC FOR THE SECOND LEVEL OF THE INFORMATION AND MEASUREMENT SYSTEM
Authors: Kondrashov Serhii , Hryhorenko Ihor , Opryshkin Aleksandr
Published: December 2022

Nowadays, in production and in everyday life, there is a question of improving the quality and efficiency of grinding systems. These can be both cement and grain factories, as well as coffee shops that use machines for grinding coffee. Effective management of the grinding process is of great importance for increasing the productivity and quality of the final product. Management of the grinding process is a complex task because many factors affect the process. In addition to the factors, the degree of wear of the cutting surfaces, the backlash in mechanical transmissions, which increases the distance between the grinders, and the material from which they are made, must also be taken into account during the analysis. Mathematical models describing the grinding process cannot be completely perfect, because they contain a limited number of factors that affect the process and all of them are defined in different physical quantities. Also, when developing a mathematical model, it is practically impossible to take into account dynamic changes in the object of control, which can be both linear and non-linear. All these features of a complex object of control make it necessary to move to the creation of a situational system with fuzzy logic, which will provide an opportunity to take into account all the features and complexities that arise when creating an «image» of the object of control. For the development of a situational system with fuzzy logic, the method of constructing a fuzzy conclusion of the Mamdani situational type, most suitable for the tasks of metrological support, was chosen. With the help of a graphical user interface, it was possible to build the situational system with fuzzy logic, which made it possible to establish the second level of the information and measurement system, where the technological and metrological «image» of the control object is formed, taking into account the influence of external and internal factors, the necessary technological regimes that will positively affect the uniformity of grinding.