bluuebunny/crossref_metadata_2025 huggingface dataset:
Decreased Hemodynamic Responses in Left Parietal Lobule and Left Inferior Parietal Lobule in Older Adults with Mild Cognitive Impairment: A Near-Infrared Spectroscopy Study
Authors: Tian Yizhu , Li Deyu , Wang Daifa , Zhu Ting , Xia Meiyun , Jiang Wenyu
Published: October 2022

Background: The brain activation patterns of mild cognitive impairment (MCI) are still unclear and they involve multiple brain regions. Most previous studies have focused on abnormal activation in the frontal and temporal lobes, with few investigating the entire brain. Objective: To identify and compare the changes in cerebral hemodynamics and abnormal activation patterns in the entire brain of MCI patients and healthy older adults. Methods: Patients with MCI (n = 22) and healthy controls (HC, n = 34) matched by age, education levels, sex, and mental state were enrolled. They performed the same letter and category verbal fluency test (VFT) tasks while their behavioral performance and global cerebral hemodynamics were analyzed. Results: The performance during the category VFT task was significantly better than that during the letter VFT task across all participants (HC: correct: p < 0.001; intrusions: p < 0.001; MCI: correct: p < 0.001; intrusions: p < 0.001). The number of correct words during the letter and category VFT tasks was significantly higher in the HC group than in the MCI group (p < 0.001). The deoxygenated-hemoglobin (HbR) concentrations in the left parietal lobule (p = 0.022) and left inferior parietal lobule (p = 0.034) were significantly different during the category VFT task. Conclusion: The differences between HC and MCI groups were greater in the category task. The HbR concentration was more sensitive for the category VFT task and concentration changes in the left parietal lobule and left inferior parietal lobule may be useful for clinical screening and application; thus, they deserve more attention.
Long term operation of a 30 kW Beryllium target at IPHI
Authors: Schwindling Jérôme , Annighöfer Burkhard , Chauvin Nicolas , Meuriot Jean-Louis , Mom Borana , Ott Frédéric , Sellami Nadia , Thulliez Loïc
Published: October 2022

Following tests of low power bulk Beryllium targets in 2016–2020, a high power target was designed, built and tested at the High Intensity Proton Injector (IPHI) at CEA Paris–Saclay. The design of the target and the results of the tests will be described.
Mechanical characteristics and parametric analysis of carbon fiber wound hydrogen cylinder for vehicles
Authors: Zhang J. , Jiang W.J. , Yang R.
Published: October 2022

High pressure hydrogen storage is one of the most important ways of hydrogen energy storage and transportation. As the core component of high-pressure hydrogen storage, service strength and bearing capacity of carbon fiber wound hydrogen cylinder are very important for the safe transportation of hydrogen. In this paper, the simulation model of carbon fiber wound hydrogen cylinder is established, the stress distributions of Al-liner and winding layer are studied, and effects of self-tightening pressure, winding angle and thickness of winding layer on the stress distribution of hydrogen cylinder are studied. The results show that the designed carbon fiber wound cylinder meets the working requirements of 35 MPa. The self-tightening pressure can reduce the Al-liner stress in the working state and improve the utilization rate of the winding layer. With the use of hydrogen cylinders, the internal pressure decreases, and the maximum stress of the cylinders' middle part first decreases and then increases. The principal stress of winding layer decreases with the decrease of internal pressure. Increasing the winding angle of spiral layer can reduce the stress of Al-liner and the principal stress of hoop winding layer, but the principal stress of helix winding layer increases. With the increasing winding layer thickness, the hydrogen cylinder stress decreases gradually.
Comparing feasibility of different tube voltages and different concentrations of contrast medium in coronary CT angiography of overweight patients
Authors: Liu Zhi-Chao , Zhao Sai , Ma Ze-Peng , Zhang Tian-Le , Zhao Yong-Xia
Published: October 2022

OBJECTIVES: To compare image quality, radiation dose, and iodine intake of coronary computed tomography angiography (CCTA) acquired by wide-detector using different tube voltages and different concentrations of contrast medium (CM) for overweight patients. MATERIALS AND METHODS: A total of 150 overweight patients (body mass index≥25 kg/m2) who underwent CCTA are enrolled and divided into three groups according to scan protocols namely, group A (120 kVp, 370 mgI/ml CM); group B (100 kVp, 350 mgI/ml CM); and group C (80 kVp, 320 mgI/ml CM). The CT values, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and figure-of-merit (FOM) of all images are calculated. Images are subjectively assessed using a 5-point scale. In addition, the CT dose index volume (CTDIvol) and dose length product (DLP) of each patient are recorded. The effective radiation dose (ED) is also calculated. Above data are then statistically analyzed. RESULTS: The mean CT values, SNR, CNR, and subjective image quality of group A are significantly lower than those of groups B and C (P < 0.001), but there is no significant difference between groups B and C (P > 0.05). FOMs show a significantly increase trend from group A to C (P < 0.001). The ED values and total iodine intake in groups B and C are 30.34% and 68.53% and 10.22% and 16.85% lower than those in group A, respectively (P < 0.001). CONCLUSION: The lower tube voltage and lower concentration of CM based on wide-detector allows for significant reduction in iodine load and radiation dose in CCTA for overweight patients comparing to routine scan protocols. It also enhances signal intensity of CCTA and maintains image quality.
Sewage sludge dewatering by electric field
Authors: Verbovskyi Orest , Orel Vadym , Matsiyevska Oksana , Derkach Davyd
Published: October 2022

During the cleaning and further treatment of municipal wastewater, sediments are formed, which are extremely dangerous from a sanitary and hygienic point of view, poorly dewatered, have high humidity (over 90%), large volumes (up to 3% of wastewater consumption), contain organic substances, pathogens, heavy metals, etc. In Ukraine, at most wastewater treatment plants, sewage sludge is mostly piled up on sludge sites after minimal treatment. Effective processing and disposal of sewage sludge in order to reduce the negative impact on the environment, as well as the use of sewage sludge as secondary raw materials, is an actual, complex and urgent task. The key link in the existing process of treatment and disposal of sewage sludge is their dewatering. When designing facilities for the treatment and disposal of sewage sludge, advanced technologies should be used, the use of which is based on scientific and technical research. The article reviews the results of research on the intensification of existing mechanical methods of sewage sludge. One of the most effective methods of intensifying the process of dewatering sewage sludge is electro-dewatering, which involves the application of an electric field during mechanical dewatering of sludge. Electro-dewatering technology makes it possible to reduce the humidity of sediments to 20...40%, reduce the concentration of heavy metals and pathogens in sediments, etc. The purpose of this work is to study the possibility of electro-dewatering of activated sludge from secondary settling tanks of municipal wastewater treatment plants in Lviv. Empirical research methods were used. A laboratory scale has been designed for electro-dewatering of sewage sludge. Activated sludge with a moisture content of 98% was studied. It is shown that the effect of activated sludge dewatering, depending on the duration of its treatment, is an S-shaped curve that resembles a kinetic autocatalytic reaction with three periods: induction, main, and fading. The possibility of electro-dewatering of sewage sludge with a maximum dewatering effect of 60% has been proven. Therefore, it is proposed to carry out mechanical dewatering of city sewage sludge using an electric field.
Research of accidents pipelines
Authors: Makarenko Valery , Gots Volodymyr , Makarenko Yulia , Arhatenko Tetiana , Polishchuk Viktor
Published: October 2022

The durability and reliability of operation of steel pipelines of water supply and sewage systems is determined in particular by the quality of their welded joints, which in turn depends both on the composition of the materials used in their manufacture and on the observance of welding technology. The composition of impurities of transported liquids, which can cause corrosive destruction of materials, also has a significant impact on the reliability of pipeline systems. These phenomena are especially important in hot water supply and industrial drainage systems, where the destructive influence of physical factors and the chemical composition of the environment can be decisive. It was found that the loss of strength of the pipeline is caused in particular by improper operation, under the conditions of which micro-flaws of welded joints of pipelines appear, which leads to their destruction. The results of examinations and experimental studies of the strength of welds of steel process pipelines are presented. An external inspection was carried out, determination of the structure and strength parameters of pipeline welds, layer-by-layer analysis of corrosion damage on their inner surface. It was found that premature destruction of welded joints of hot water supply pipelines and industrial sewage is caused by long-term operation in a stressed state. Under such circumstances, the uneven coarse-grained structure of the seam, the presence of non-metallic inclusions in the metal structure, and violations of the welding technology had a critical impact on the loss of strength. In order to increase the corrosion-mechanical resistance of welded joints of industrial pipelines, it is necessary to modify the surfacing metal of the weld to break down the structure and significantly reduce non-metallic inclusions, as well as to improve the technology of manual arc welding with coated electrodes, in particular, the root layers of welding seams.
Dalit Literature is But Human Literature: A Reading of Selected Poems of Aparna Lanjewar Bose
Authors: Ramteke Ankit
Published: October 2022

La negativa a ser encasillado en categorías constituye una de las características distintivas de la poesía de Aparna Lanjewar Bose. La molestia y la furia que prevalecen en muchos de sus poemas llevan la impronta de su frustración por la forma de pensar extremadamente dividida en la India. Aún así, definitivamente es una poeta del mundo; ella desfamiliariza a sus temas bastante conscientemente, ocultando lo personal incluso en sus poemas más íntimos, proyecta una visión del mundo que se libera de las identidades parroquiales y localizadas de castas de la India. Este artículo se centra en poemas seleccionados de Aparna Lanjewar Bose, donde encuentra su voz no solo en el espacio poético anglófono sino en el campo más amplio de la poesía dalit también. También examinaré su delicado manejo de 'Dalit' como una categoría que no es ni reduccionista ni meramente retórica. La opresión de castas ya no se limita al contexto indio, es una crisis humanitaria que ha sido y debe ser abordada continuamente a nivel internacional. Por lo tanto, el tema de Aparna no tiene el sufrimiento, la inestabilidad y los deslices particulares de los indios; es totalmente un dilema humano que debe abordarse en todos los niveles.
Information Technology of Designing the System of Automatic Stabilization of the Flow of Bread Mass at the Entrance to the Thresher of the Combine
Authors:   Central Ukrainian National Technical University, Osadchiy Sergiy , Vskhrova Larysa ,   Central Ukrainian National Technical University, Kalich Viktor ,   Central Ukrainian National Technical University, Miroshnichenko Mariia ,   Central Ukrainian National Technical University
Published: October 2022

The article presents a new methodology for creating information technology for the design of a combined system for stabilizing the flow of bread mass at the entrance to the combine thresher. The characteristic features of such a methodology are outlined. This allows the design of process control systems on the combine, taking into account external influences that are stochastic in nature. The stages of creation of information technology for the synthesis of the optimal combined stabilization system with feedback on the deviation of the bread weight from the average value and correction for changes in yield are substantiated. The article substantiates the composition and determines the content of operations of the new information technology of designing a combined system of stabilization of the flow of bread mass at the entrance to the thresher of the combine. The new technology has several distinctive features. First, its introduction allows to obtain differential equations of the combine harvester, which take into account the dynamic properties and design features of hydraulic transmissions operating in the mode of constant load change. Secondly, it allows you to design process control systems on the combine, designed for external influences that are stochastic in nature. Third, the new technology allows the synthesis of optimal combined stabilization systems under the conditions of two multidimensional independent sources of disturbance at the input and output of the stabilization object.
Tools and Methods for Developing Startups in Engineering Clusters
Authors:   Central Ukrainian National Technical University, Holyk Olena
Published: October 2022

The article is aimed at reviewing the most effective methods and tools for the making of startups. Relevance of familiarization of students of engineering specialties with these methods lies in the need to acquire knowledge, skills and skills in innovative project activities. As the labors market is constantly changing, employers are interested in graduates who have project skills and practical experience. The article considers soft skills that will be in demand in the coming years for successful professional growth and ability to work in a team. The advantages and disadvantages of teamwork, as well as recommendations for improving the effectiveness of teamwork, are presented. The main obstacles preventing control of the process to develop the startup are mentioned. Methods of planning and control of time, determination of priorities of tasks are considered. To formulate the project name and to form the goals, the main instruments that allow to determine the influence of strong and weak sides (SWOT-analysis) are given. Also the tools of the composition structure of works and the hierarchical structure of works which allow to divide the project into components of tasks and subgoals are considered. Thus, the study of engineering and technical specialities of the methods and tools of making start-ups, presented in the article, will help students to form skills to survive failures, to treat their own mistakes with tolerance, to learn to work in a team in a multidisciplinary environment. As a result, students can take a risk-free trial during their studies at the university, and once they have completed their studies they will be ready to engage in professional activities at once.
Rationalization of Reloading Cranes at Container Terminals of Freight Stations
Authors:   Ukrainian State University of Railway Transport (UkrDURT), Kryachko Kateryna , Kuleshov Valerii ,   Ukrainian State University of Railway Transport (UkrDURT), Shramko A. ,   Ukrainian State University of Railway Transport (UkrDURT)
Published: October 2022

The article considers the issue of efficiency of technical equipment of container terminals and rationalization of handling facilities and economic justification of their required number for the estimated service life, taking into account the allocation of investments in conditions of limited resources. One of the main problems of optimal control of reloading processes is the choice of a rational strategy for controlling loading and unloading machines within the work cycle, when the range of their movement at design speeds and accelerations is crucial given the constraints imposed on control parameters determined by design and operational conditions (permissible speeds and accelerations for a particular cargo front, maximum traction, operational productivity, site capacity, etc.). The optimization criteria can be the cost parameters for performing the basic operations of the operating cycle, taking into account energy costs depending on the range of loading and unloading machines. In the case where the container site is serviced by several handling equipment, the downtime of one group of cars depends on the downtime of other handling facilities. At existing freight stations, the length of container sites ranges from 100 to 300 m and more. The intensity of use of the length of the cargo front is very small, which causes a large amount of shunting work, interoperable downtime of loading and unloading machines and rolling stock. Thus, the introduction of rational control technology for loading and unloading facilities should be consistent with the design of the cargo station and container terminal, which would allow to fully implement all the design parameters with the lowest operating costs.
Simulation of the Process of Expanded Feed Preparation
Authors:   Dnipro State Agrarian and Economic University, Aliiev Elchyn , Linko Mykolay ,   Dnipro State Agrarian and Economic University, Aliieva Olga ,   Institute of Oilseeds of the National Academy of Agrarian Sciences of Ukraine
Published: October 2022

Expanded feed preparation is carried out on the appropriate high-temperature short-term equipment of the HTST family - expanders, which are able to perform the task of cooking food and feed under high pressure. In addition to the chemical processes that occur during expansion (denaturation of proteins, amino acids, vitamins, starch and enzymes), there is a change in the physical and mechanical properties of feed components and their transformation into expands. From the point of view of process physics, the process of expander formation in the expander is reduced to pressing a mixture of solid (grain components), liquid (in the form of moisture) and gaseous (vapor) phases by a screw working body through a forming nozzle under the action of an external heat source. From the point of view of mathematical description, this process is complex and therefore can be described by computer simulation. Analyzing the capabilities of these software packages for the task of simulating the formation of agglomerates (expanders) in the expander was chosen Star CCM +. The simulation of the process of expanded feed preparation in the software package Star CCM + provides the prerequisites for justifying the range of rational parameters of the expander. The simulation of the expander operation allows to determine as research criteria: the pressure in the cavity between the screw and the cylinder of the expander, the density of the obtained expands, the performance of the expander, the temperature scalar field and the velocity field vector of the multiphase mixture. As research factors should be chosen: the phase ratio of the multiphase mixture, the speed of rotation of the screw, the temperature of the heater, diameter, length and pitch of the screw.
Improving the Efficiency of Technical Operation of Trucks
Authors:   Western Ukrainian National University, Rozum Ruslan , Buryak Mykola ,   Western Ukrainian National University, Prohnii Pavlo ,   Western Ukrainian National University, Falovych Natalia ,   Western Ukrainian National University, Shevchuk Oksana ,   Western Ukrainian National University, Popovich Pavlo ,   Western Ukrainian National University, Zakharchuk Olena ,   VSP FKEPIT
Published: October 2022

The article analyzes the causes of failures of vehicle structures belonging to complex systems. In order to ensure the operational reliability and operability of freight rolling stock, namely the supporting frames of automotive cargo semi-trailers and trailers during their operation. The chosen topic is relevant today, because the automotive industry is firmly in the lead in the transport industry. It is known that the quality of transportation is determined by the technical conditions of rolling stock. This is especially important if the rolling stock is represented by vehicles The reliability of freight rolling stock was studied, taking into account 2000 hours of experimental tests at the machine-test station during transport works, including 3.5 thousand loading and unloading cycles, which is 50% of the operating time. It is noted that the organization of transport work of the machine-test station does not exactly coincide with the real operating conditions, which affects the reliability indicators: for example, readiness and average failure time increase, and failure decreases. Structural analysis of the fault complex is an important part of a comprehensive system to ensure the reliability and survivability of the supporting frame of the car trailer. Generally speaking, the main causes of metal failures are manufacturing defects (production stage) and design errors (design stage), and the overall failure rate due to poor design and production quality can be over 50%. The analysis of the causes of failure of welded metal structures shows that the influence of a single factor on its frequency in emergency situations, factors related to stress concentration and subsequent development of cracks, is up to half. Of these, breakdowns due to design defects at the design stage and poor quality of manufacture and assembly of machines are about a quarter each, and due to low technology and low quality materials - more than a third, due to violations of vehicle rules and low quality staff - every tenth .
Research of Speed Factor and Methods of Speed Determination During Auto Technical Examination
Authors:   Cherkasy State Technological University, Shlionchak Ihor , Lukianchenko Oleksandr ,   Cherkasy State Technological University, Harenko Valerii ,   Cherkasy Research Forensic Center of the Ministry of Internal Affairs of Ukraine
Published: October 2022

The publication notes that the rapid motorization of Ukraine has naturally led to the need to ensure road safety at a new modern level. It has been established that one of the effective measures to improve the road safety system is speed control. This, in turn, involves appropriate regulation of the permitted speeds. Determining the speed of vehicles helps to establish a causal link between the driver's actions and the accident. It is concluded that the most significant cause of road accidents with serious consequences and deaths is the wrong choice of speed. The following issues require further, more in-depth study: methodological aspects of determining the speed of movement of ATZ, which are based on the use of the laws of conservation of the amount of movement; construction of a mathematical model of the interaction of a car wheel with a boundary obstacle; statistical studies on the formation and updating of the database on stiffness and damping parameters of modern suspensions and the coefficient of adhesion; comparative assessment of the probability of traditional and improved methods of calculating vehicle speeds before a collision in a road accident; development of proposals for instrumental provision of a mobile laboratory for the reconstruction of road accidents at the scene of the incident.
Kinematic Dependencies of Two-axis Parallel Manipulator With Rotary Fastening of Hinges of Variable Length Links
Authors:   Central Ukrainian National Technical University, Kropivny Oleksandr , Hrechka Andrii ,   Central Ukrainian National Technical University, Kyrychenko Andrii ,   Central Ukrainian National Technical University, Shcherbyna Kyryl ,   Central Ukrainian National Technical University
Published: October 2022

In the article the kinematic problem for a new two-axis parallel manipulator with rotary hinged parallelogram, the source of which is a spindle unit, is performed. The analysis of the received kinematic dependencies is carried out. The presence of special provisions of the source body of the mechanism is established. The directions of further scientific researches are outlined. The parallel manipulator structure for consideration differs from previously developed fastenings of hinges of rods of variable length on rotary levers which rotation is coordinated with rotation of an initial link with a spindle unit. On the basis of the developed scheme mathematical dependences for lengths of actuators are established. The performed mathematical transformations allowed to solve direct and inverse kinematic problems for the mechanism. Analysis of the obtained kinematic dependences showed the presence of special positions of the initial body of the mechanism in the form of kinematic parallel singularities. Their graph is given. Graphs of changes of coordinates of an output link at change of lengths of rods of the drive of giving are shown. The analysis of graphic dependences shows existence of such combinations of constructive parameters of the mechanism at which the drive of giving starts to work in a multiplicative mode. The obtained dependences will allow to ensure the functioning of the kinematic circuits of the feed drive of this mechanism. The established points of the kinematic parallel singularity of the feed drive and its operation in the multiplicative mode require further consideration taking into account the dynamic loads. By selecting the design parameters of the mechanism, it is possible to achieve close to rectilinear relationships between changes in the length of the rods and the movement of the spindle unit.
Logistics Infrastructure of Ternopil Region
Authors:   Western Ukrainian National University, Falovych Natalіia , Falovich Volodymyr ,   Western Ukrainian National University, Shevchuk Oksana ,   Western Ukrainian National University, Popovich Pavlo ,   Western Ukrainian National University, Progniy Pavlo ,   Western Ukrainian National University, Melnichenko Vasil ,   Western Ukrainian National University
Published: October 2022

A study of the transport network of Ternopil region was conducted. The existing transport network for all types of transport operating in the region, in particular, railway, road, aviation, river, pipeline in terms of traffic volumes is analyzed. The dynamics of passenger traffic in the region by mode of transport in the period from 2016 to 2020 is analyzed and conclusions are drawn on its operation. An analysis of the volume of freight traffic in the Ternopil region by mode of transport in the period 2016-2020. The transport industry is characterized in terms of railway, automobile, aviation and pipeline complex in terms of the availability of fleet, stations, waiting rooms and other necessary infrastructure. The logistics infrastructure of Ternopil region is represented by rail, road, river, pipeline and air transport. The main factors that reflect the peculiarities of the formation of transport infrastructure of Ternopil region are as follows: 1. Location in the center of the Western region of Ukraine, as well as proximity to the borders with EU countries provides a unique economic and geographical position of the region. 2. Favorable physical-geographical and favorable natural and climatic conditions for the development of transport infrastructure (most of the region is a flat area, only in the north are the Kremenets Mountains). 3. Availability of the required amount of transport, warehousing infrastructure, communication lines and power lines. 4.The economic potential of the region contributes to the development of transport infrastructure that provides transportation of passengers and raw materials, finished products in the required volumes. 5. International transport highways pass through the region, which contributes to the development of the infrastructure of the surrounding areas. 6. Proximity to major centers of business cooperation and border cities. Railway transport in Ternopil region is widely used in both domestic and international relations. In 2020, its share in the structure of freight turnover was 22%, and passenger turnover - 2%. If we compare these data with the volume of traffic in 2016 (24% and 7%, respectively), we can conclude that the quarantine restrictions during the COVID-19 pandemic have a significant impact on the volume of rail transport.
Digitalization of the Processes of Customs Control and Customs Clearance of Goods in Railway Transport
Authors:   Ukrainian State University of Railway Transport, Berestov Ihor , Pestremenko-Skrypka Oksana ,   Ukrainian State University of Railway Transport, Shelekhan Hanna ,   Ukrainian State University of Railway Transport, Berestova Tetiana ,   Ukrainian State University of Railway Transport
Published: October 2022

The article is devoted to the research of proposals on the organization of rational customs control, processing and passing of trains at the border transfer stations of Ukraine in the service international traffic. For quality work and fast processing of cars there is a need to improve the information component of the transportation process export and import freight flows through border transmission stations. This possibility is provided by the use of electronic declaration during the registration of international cargo operations. International transportation of goods is a necessary detail that makes it possible to realize trade relations between states. It is an effective tool of foreign economic activity, without which it would be almost impossible. The efficiency of the organization international cargo transportation significantly depends on the coordinated organization of the work the border transfer station, which carries out a complete list of operations in cooperation with customs, border and other state control services. In order to increase the technology of passing international freight flows through border transfer stations, it is necessary to introduce the latest information and control systems that will reduce the duration of train processing at border transfer stations and, as a result, reduce downtime and delayed cars. Research on the development of technologies and means electronic data exchange that provide information support for international cargo transportation is promising. The electronic data exchange system must comply with the international transport infrastructure, be based on agreed technical parameters and meet the needs of compatibility of transportation technologies as a criterion for the integration of the national transport system into the world system. It is proposed to carry out preliminary declaration of goods and processing transport documents before the departure of the train to the border transfer station to reduce the technological time of processing trains. This will reduce the processing time of the transit train by 105 minutes. The main advantages of the introduction electronic document management: simplification of document management; making effective management decisions; increasing the reliability of the processed information, reducing the downtime of cars. Thus, the introduction of the system pre-declaration of goods and processing of transport documents in the processing international freight traffic will reduce material and labor costs and speed up the passage of goods through customs clearance.
Improved Model and Software of the Digital Information Service of the Municipal Health Care Institutions
Authors:   Central Ukrainian National Technical University, Dorenskyi Oleksandr , Drobko Olena ,   Central Ukrainian National Technical University, Drieiev Oleksandr ,   Central Ukrainian National Technical University
Published: October 2022

Today, state and municipal services are being actively digitized in Ukraine. In particular, the Kropyvnytskyi city authorities initiated the creation of several information systems (IS) necessary for the development of various spheres of activity based on public needs for municipal services. Among these are IS of medical services provided by the city's health care institutions. Thus, the scientific and technical task of implementing the software for the municipal medical services information system in the city of Kropyvnytskyi is relevant. The work aims to implement access to information about medical services of health care institutions in the city of Kropyvnytskyi by creating municipal information systems with iOS-client. The scientific novelty of the obtained results is to improve the model of municipal information systems of medical services through the implementation of the offline mode of system operation, which in contrast to existing models of similar municipal systems provides access to IP data in the absence of Internet connection. The practical value of the results of scientific work is determined by the developed algorithms of the system, non-creation, work with the map and collection center of analytical, mobile iOS-application of the municipal medical services information system for the city of Kropyvnytskyi, published in the "App Store".
Experimental Study of Deformation of Helix Honing Tool
Authors:   Central Ukrainian National Technical University, Shcherbyna Kyryl , Pidhaietskyii Mykhailo ,   Central Ukrainian National Technical University, Mazhara Vitalii ,   Central Ukrainian National Technical University, Hrechka Andrii ,   Central Ukrainian National Technical University, Dyachenko Tetiyna ,   Kropyvnytskyi engineering College of Central Ukrainian National Technical University
Published: October 2022

One of the important issues in the development of agricultural engineering is to increase the efficiency of finishing processes of machining the surfaces of controlling parts of the hydraulic machines equipment and the fuel system of internal combustion engines. High accuracy and quality of parts influence the performance of functional indicators and the consistency of their performance. One of the processes of finishing machining is honing of precision holes. The factor that impacts the accuracy and quality of the machined hole is the ability to influence the process of formation of macrogeometry and microgeometry due to the flexibility of the process. The quality of the micro-relief is influenced by the kinematics of the formation of a grid of traces. The formation of macrogeometry, in turn, is influenced by the principle of formation of geometric production lines, taking into account copying of existing deviations and the transfer of wear of diamond-abrasive bars. To level the impact of existing deviations of the machined hole it is necessary to carry out a flexible control of the process of adjusting the radial size. To ensure the flexibility of the process of honing holes, a helix honing tool is proposed, which eliminates the shortcomings of the existing diamond-abrasive tool by using elastic deformations to increase the radial size and placement of diamond-abrasive bars at an angle of 45º. To study the process of adjusting the radial size of the helix honing tool, the calculated scheme of elastic deformation of the geometric axis and a mathematical model describing the deformation process are presented. An experimental setup of the deformation of the helix honing tool in the axial direction is also given. As a result of the experimental study of the helix honing tool, the theoretical and experimental dependence of the magnitude of the increase in diameter and the force of deformation on the axial elastic deformation is determined. There are also mathematical models obtained as a result of the experimental study of the dependence of the diameter increase on the magnitude of the applied force and axial elastic displacement.
Tectological Approach to the Formation of Logistics Systems at Transport and Production Enterprises
Authors:   Central Ukrainian National Technical University, Aulin Viktor
Published: October 2022

This work examines the approach to the formation of logistics systems at transport and production enterprises from the point of view of the science of organization - tectology. We will present a possible complete logistics system at the enterprise. All its types are the organization of specific experience with the expediency of their study and the formation of the interconnection of flows, different in content and complexity of individual organization. The logistics system is presented as a set of activities and resistances, and its organization is regulated by such laws as selection and measure. The implementation of these laws has been clarified. Logistics systems at the transport and production enterprise are also considered from the point of view of the organization of business experience in a specific natural-climatic, economic and social environment, as well as a multi-level structure. The structure of the farm system from homogeneous and qualitatively heterogeneous elements is considered. The main features of the Ukrainian economic system in the conditions of a deficit economy with incomplete market saturation are clarified and the main directions for correcting the situation are formulated. On the basis of the different content of flows at enterprises, a complete logistics system with generalized types of logistics is formed: military, economic, mathematical; system-level logistics of functional areas: financial, commercial, informational, service; level of functional areas of commercial logistics: supply, production, sales; logistics at the level of key activities: transport, warehouse, stocks. Logistic objects, as tectological formations of management experience in a specific natural-climatic, economic and social environment, should be presented in their vital, socio-practical sense. At the same time, the experience of the organization should be considered as it really is, as it is given to people in observations.
Neural Network Method for Detecting Textural Anomalies in a Digital Image
Authors:   Central Ukrainian National Technical University, Drieiev Oleksandr , Dorenskyi Oleksandr ,   Central Ukrainian National Technical University, Drieieva Hanna ,   Central Ukrainian National Technical University
Published: October 2022

Modern computer vision systems often use neural networks to process images. But to use neural networks, you need to create databases to train these neural networks. In some cases, creating a training database takes the vast majority of the project's financial and human resources. Therefore, the actual task of finding methods to improve the quality of learning neural networks on small data is considered in this article. The ability to process data, which nature was not present in the original training database is relevant, also. To solve the problem of improving the quality of image segmentation by textural anomalies, this research is proposed to use as input to the neural network not only the image but also its local statistic data. It can increase the information content of the input information for the neural network. Therefore, neural networks do not need to learn to choose statistical features but simply use them. This investigation classifies the requirements for image segmentation systems to indicate atypical texture anomalies. The literature analysis revealed various methods and algorithms for solving such problems. As a result, in this science work, the process of finding features in the photo is summarized in stages. The division into stages of search for features allowed to choose arguments for methods and algorithms that can perform the task. At each stage, requirements were formed for methods, that allowed separate the transformation of image fragments into a vector of features by using an artificial neural network (trained on a separate image of the autoencoder). Statistical features supplement by the vector of features of the image fragment. Numerous experiments have shown that the generated feature vectors improve the classification result for an artificial Kohonen neural network, which is able to detect atypical image fragments.
Improving the Productivity of the Casting Process by Regulating the Thermal Regime of the Chill Mold on a Basis of Computer Investigation of the Air Flow in the Channels of the Casting Core
Authors:   Central Ukrainian National Technical University, Kononchuk Serhii , Skrypnyk Oleksandr ,   Central Ukrainian National Technical University, Sviatskyi Volodymyr ,   Central Ukrainian National Technical University, Pukalov Viktor ,   Central Ukrainian National Technical University
Published: October 2022

The most common technology for the manufacture of aluminum parts and blanks is casting in a chill mold. To determine ways to improve casting technology, it is necessary to analyze the possibility of changing the parameters that affect the reduction of production costs (reduction of energy consumption, material consumption, increase productivity) and improve the quality of casting. The thermal regime of the metal form determines the productivity of the process, the duration of curing of the casting, its quality, durability of the chill mold. The analysis of the work of the chill mold for the manufacture of castings Pump Housing showed that when the forms are filled, the most heated new portions of metal meet on their way to the central core. That is, when pouring the mold, the central core is heated the most, especially in the lower part. This circumstance hinders the process of directed curing and can lead to shrinkage defects. In addition, the higher the temperature of the mold, the slower the casting will crystallize and the worse its structure and mechanical properties will be. Based on the analysis of structures and methods of cooling molds, the method of controlled cooling of the central core by air is substantiated. A new design of the core has been developed, which provides adjustable air cooling of the chill mold by connecting the central core through a valve to the pneumatic system of the shop. 3D-models of details and assembly drawings of the central core of a new design are developed. A computer study of the air flow in the core channels in SolidWorks Flow Simulation was performed. The results of parametric modeling of air flow in the channels of the Central core showed the maximum air flow rate during cooling 0.371 kg / s, the heat content of air when cooled 25081 J / s. Evaluation of the cooling efficiency of the developed chill mold design showed that when using air cooling of the central core with cooling air at its maximum consumption, 41% of heat is removed. Thus, the developed design of the cooled central core allows to increase the productivity of the casting process, improve the quality of casting by improving the structure and mechanical properties of the casting, as well as increase the life of the chill mold. But the obtained research results are of a recommendatory nature and require practical verification in the production environment. In addition, the simulation did not take into account the change in core temperature due to its heat exchange with the melt. Given all this, there is a need for further study of the effect of regulated air cooling on the thermal regime of the chill mold.
Research and Comparative Analysis of Wear Resistance of Cast Grinding Media From Chromium Cast Irons
Authors:   Central Ukrainian National Technical University, Lomakin Viktor , Kropivnyi Volodymyr ,   Central Ukrainian National Technical University, Pukalov Viktor ,   Central Ukrainian National Technical University, Molokost Lyudmyla ,   Central Ukrainian National Technical University
Published: October 2022

A study was made of the impact-abrasive wear resistance and impact resistance of grinding bodies cast in a multi-place mold. Three types of chromium cast irons were adopted for the study: low chromium (~1% Cr), medium chromium (up to 5% Cr) and high chromium (up to 20% Cr). The macro- and microstructure of these alloys as a material for cast grinding balls has been studied. Installed an increase in the impact-abrasive wear resistance and impact resistance of such products with an increase in the mass fraction of chromium in cast iron due to the formation of carbides of the (Fe, Cr)3C and especially (Fe, Cr)7C3. Balls were cast in multi-seat chill molds. Cast iron was smelted in a medium-frequency induction furnace, such as IChT, with the main lining on a charge of pure pig iron and steel low-carbon scrap. The temperature of cast iron production was 1500 °C. Liquid cast iron was subjected to alloying with medium carbon ferrochrome. The wear resistance of cast irons was determined on samples cut from balls in the radial direction. The tests were performed in a laboratory mill When tested for impact resistance, the grinding ball received a striking blow of mass 50 kg, falling from a height of 0,5 m. The frequency of application of dynamic loads was 10 beats per minute. Impact resistance was determined by the average number of impacts sustained by the grinding body prior to destruction. Nevertheless, significant excess of the cost high-chromium over low-chromium cast iron forces us to agree with the opinion of the majority of researchers and the practice of production of such metal products. In today's conditions, low-chromium white cast iron is an economically viable material for grinding media.
Monitoring of the technical condition of MPDF on guidelines for their operation
Authors:   National University of Life and Environmental Sciences of Ukraine, Nоvitskiy Andrey
Published: October 2022

The efficiency of use and increase the reliability of agricultural machinery depends on the regulatory and technical documentation governing the requirements for its technical condition and operation. The analysis of the existing normative-technical and guiding documents on ensuring the reliability of means for preparation and distribution of fodder is given. To effectively carry out maintenance and repair of means for the preparation and distribution of feed should know: the criteria for disability; maximum and permissible parameters of technical condition; indicators of the transition of equipment from working to inoperable condition. The article presents the monitoring of instructions for maintenance and operation of machines, guide materials for use from the standpoint of their informativeness on the implementation of reliability requirements. Monitoring of technical condition was carried out for foreign samples of means for preparation and distribution of feed with horizontal mixing and grinding mechanisms. The mechanisms are analyzed from the standpoint of the availability of information about the features of the structure, the characteristic faults and failures, the main ways to restore efficiency. Ensuring reliability includes several activities throughout the life cycle. The main provisions for assessing the technical condition and improving the reliability of machines when using guide materials. The provisions include: information on the reliability of machines, mechanisms, working bodies; periodicity of maintenance and repair of machines, restoration of working bodies; information on the complexity of maintenance and repair of machines, restoration of working bodies; schemes of assembly and disassembly of mechanisms; information on typical failures and the sequence of their elimination; information on the limit state criteria; technologies for the restoration of working bodies; information on installation requirements. The current normative documents of the system of general technical requirements for the means for the preparation and distribution of feed do not fully meet the organizational and methodological aspects of ensuring their reliability.