The collection of scientific works covers the results of experimental and theoretical research in scientific specialties: 105 Applied physics and nanomaterials; 113 Applied Mathematics; 131 Applied Mechanics; 132 Materials Science; 133 Industrial engineering; 151 Automation and computer-integrated technologies.
Луцький національний технічний університет
STUDY OF HYDRO-GAS-DYNAMIC PROCESSES IN CLOSED BYPASS CHANNELS WITH CIRCULAR AND TRIANGULAR CROSS-SECTIONS
iangular cross-sections. One of the approaches used was the analytical method, which involved complex mathematical calculations followed by process visualization using the MATLAB system. This approach enabled a detailed investigation of the channel characteristics and the reproduction of laminar flow phenomena of liquids and gases, allowing for a deeper understanding of their physical features. Another method involved the use of simulation-based computer modeling of the laminar flow of liquid and gas through channels with circular and triangular cross-sections using SOLIDWORKS Flow Simulation software. To implement this approach, the necessary input parameters and conditions were specified, and the resulting data were subjected to detailed analysis and interpretation. This method allowed for the creation of highly accurate computer models of hydrogasodynamic processes, facilitating a deeper exploration of their behavior and interaction under various cross-sectional shapes of the channels. A comparison of the results obtained from both methods confirmed their ability to adequately model hydrogasodynamic processes in closed bypass channels with circular and triangular cross-sections. The data obtained not only validated the accuracy of the chosen methods but also provided a deeper understanding of the mechanisms of liquid and gas flow under laminar conditions. This research opens new opportunities for further scientific developments in the field of hydrogasodynamics and has the potential for application in engineering calculations where high precision, reliability, and credibility of hydrogasodynamic models are crucial.
Copyright (c) 2025 Naukovi notatky
SYNTHESIS OF NITROSTARCH: CORRELATION BETWEEN NITRATION METHODOLOGY, STRUCTURAL CHARACTERISTICS, AND FUNCTIONAL PROPERTIES IN THE CONTEXT OF DEVELOPING HIGH-ENERGETIC MATERIALS
This study presents a comprehensive investigation into the synthesis of nitrostarch, focusing on the correlation between nitration methodology, the resulting structural characteristics, and the functional properties critical for its application in highenergy materials. A comparative analysis of classical nitration methods using mixed acid (HNO₃/H₂SO₄) and a modern approach employing nitrating oleum (with a free NO₂ content of 3-20%) in combination with sulfuric acid was conducted. The research highlights the significant influence of the nitrating agent's composition on the degree of esterification, molecular degradation, and ultimately, the thermal stability of the final product. Experimental work involved the nitration of corn and potato starch under controlled conditions. The oleum-based method was found to be superior, enabling the production of nitrostarch with a high nitrogen content (12.6-12.9%), indicative of a high degree of substitution, while minimizing destructive side reactions and preserving the integrity of the polymer chain. Furthermore, the impact of various post-synthesis stabilization techniques, including acid boil, alkaline boil, and washing procedures, was systematically evaluated. The results demonstrate the strong structure-property relationships in nitrostarch and confirm its significant potential as a sustainable and effective component for modifying the burning rate and mechanical properties of advanced high-energetic compositions, thereby contributing to the diversification of raw material sources for the defense and aerospace industries.
METHODOLOGY FOR PREDICTING FLAX FIBER AND SEED YIELDS USING UAV PHOTOGRAPHY AND AUTOMATED PHOTOANALYSIS
Accurate forecasting of flax (Linum usitatissimum) fiber and seed yields is essential for optimizing harvest operations and post-harvest processing. This paper presents a methodology that integrates high-resolution UAV (drone) imagery with field observations of crop maturity and growth quality to predict final fiber and seed yields. A multi-rotor UAV equipped with multispectral and RGB sensors captured images at key growth stages. These images were automatically processed using a custom image-analysis module to compute vegetation indices (e.g., NDVI) and structural plant traits. The proposed method provides timely and precise yield assessments, supporting efficient flax production and sustainable utilization of agricultural biomass.
GENERATIVE ARTIFICIAL INTELLIGENCE AGENTIC SOLUTIONS FOR SOFTWARE QUALITY ASSURANCE
AI agents demonstrate autonomy in planning, execution, analysis, and maintenance, offering potential to address persistent challenges in quality assurance such as maintenance overhead, lengthy debugging cycles, and limited predictive capacity. To structure the investigation, seven core agentic use cases were defined, covering the full lifecycle of test automation. A comparative evaluation of three SaaS platforms—KaneAI, Zephyr Scale Automate, and TestRigor—was conducted using a dual framework that combines quantitative scoring with qualitative assessment. This approach enables an integrated understanding of both the maturity of support for agentic functionality and the qualitative depth of its implementation, contributing to ongoing discourse on the evolution of software testing practices.
STUDY OF DYNAMIC VISCOSITY OF EPOXY COMPOSITIONS USING NANO- AND MICRO-FILLERS
The article investigates the effect of nano- and micro-fillers on the dynamic viscosity of epoxy composites based on DER 331 resin. Carbon nanotubes (NT) and CARBON BLACK N220 nanosoot were used as nanofillers at a content of 0.01 to 0.1 mas.%, and chromium oxide Cr₂O₃ powders (20 μm) and silicon carbide SiC (40 μm) at a content of 5 to 20 wt.% as microfillers. Rheological studies were carried out on an NDJ-1S viscometer at four shear rates (6, 12, 30, 60 rpm). The results showed that the introduction of fillers increases the viscosity of composites compared to pure resin, with microfillers having a greater effect due to their higher volume fraction. Nanofillers significantly increase the viscosity of epoxy compositions than NTs due to their tendency to aggregation. All compositions exhibit pseudoplastic properties: viscosity decreases with increasing shear rate. The mechanism of changes in rheological properties is explained by the model of floc formation and destruction (for nanofillers) and hydrodynamic interaction of particles (for microfillers). The optimal filler content was established: 0.05 mas.% for nanoparticles and 10 mas.% for microparticles, which can provide an improvement in mechanical properties without significant deterioration in processability. The results obtained are of great importance for the development of technologies for applying protective coatings in shipbuilding.
PRODUCTION OF TUNGSTEN-BASED POWDER BY REDUCTION IN HYDROGEN
The article develops a method for obtaining tungsten-based powders by reduction in hydrogen. Technological characteristics of the synthesis are established, which allowed obtaining tungsten-based powders with specified physical and technological properties. Morphological features of the particles of the obtained powders, their chemical and phase composition, as well as bulk density and compaction density, and compressibility are established.
THERMODYNAMIC ANALYSIS OF OBTAINING BINARY Cr-Ta LIGATURE
Thermodynamic assessment and study of phase formation patterns in the Cr-Ta system during the simultaneous carbothermal reduction of Cr2O3 and Ta2O5 oxides with carbon at a temperature of 1000 ℃ were carried out. It is shown that in the presence of a reducing agent (carbon), thermal energy is directed to the reduction of Cr2O3 and Ta2O5 oxides. This prevents the reaction between the reduced metals and, as a result, limits the formation of stable Cr2Ta phases.It was established that the use of the adjacent reduction method not only contributes to the formation of a stable Cr-Ta solid solution, but also reduces the average particle size of the reduced powder to 2 μm.
HARDWARE PLATFORMS FOR AUTOMATED UAV CONTROL: COMPARATIVE ANALYSIS AND OPTIMAL SOLUTION SELECTION
This article examines the most optimal hardware platforms for controlling unmanned aerial vehicles (UAVs). It explores essential factors in selecting flight controllers, including computational performance, peripheral support, energy efficiency, and real-time operating system (RTOS) compatibility. Special emphasis is placed on power stability, integration with sensors, cameras, and communication modules, and ensuring seamless operation in challenging conditions. The suitability of ESP32, Teensy 4.1, and STM32 «Blue Pill» for advanced drone applications is assessed, comparing them with alternatives like Raspberry Pi, Arduino Uno, and BeagleBone Black. The analysis highlights the advantages and limitations of each platform in terms of power management, connectivity, and responsiveness. The conclusion underscores the necessity of proper power system design, including high-quality voltage regulators such as UBEC and PDB, to ensure flight stability and efficiency.
INFLUENCE OF SILICONE ADDITIVES ON STRUCTURE AND MECHANICAL PROPERTIES OF POLYURETHANE FOAM
The work presents a study of the effect of cilicone supplement on the structure and mechanical properties of polyurethane foam (PPU). PPUs were obtained by the pouring in plastic forms due to the synthesis of polyole (with the content of the foam) and the polyisocyanate components in the weight ratio of 2:4. The modifying silicone additive was introduced at the stage of mixing components in different weight ratios from 1 to 4 weight particles. The microstructure of the obtained foam with different weight content of silicone additives is analyzed, their porosity and structural and morphological features were evaluated and the behavior of modified PPU samples during deforming with static compression is considered. The pattern of change of porosity and mechanical characteristics is described due to the variation of the weight ratio of components. An increase in the particle of silicone additive leads to an increase in strength and mechanical characteristics at the same time as a decrease in PPU plasticity and an increase in the proportion of open pores in the material. The approaches described in the work can be used in the manufacture of foam structures that have predetermined characteristics.
USE OF BIODEGRADABLE MATERIALS FROM OIL FLAX CELLULOSE FOR FOOD PACKAGING
The article explores the prospects of using biodegradable materials based on oil flax cellulose for food packaging. The transition to a circular economy and the need to reduce plastic waste drive the development of alternative environmentally friendly solutions in the packaging industry. The research methodology includes an analysis of current trends in biopolymer material production, an assessment of the physicomechanical properties of biodegradable materials derived from oil flax cellulose, and a forecast of their market implementation. A comparative analysis was conducted to evaluate the properties of oil flax cellulose against other natural biopolymers. Significant attention is given to the potential applications of oil flax cellulose in various industrial sectors. The study demonstrates a high yield of cellulose acetate biofibers, that exhibit resistance to acidic and saline environments, making them promising for use in the food and medical industries. The life cycle analysis of flax fiber confirms its environmental benefits and minimal ecological impact. The results indicate that using biodegradable materials based on oil flax is an effective tool for reducing dependence on synthetic polymers. The research contributes to the implementation of innovative environmentally safe technologies in Ukraine’s packaging industry, thus contributing to the reduction of plastic waste. The utilization of oil flax cellulose can significantly improve the ecological situation and promote sustainable development in the agricultural sector by creating a closed-loop production system that fully utilizes all plant components without generating waste.
EXPERIMENTAL DETERMINATION OF THE VALUES OF THE FUNCTIONS OF THE POSITION OF THE WORKING BODIES OF CHAIN STITCH MACHINES OF TYPE 101 AND CONSTRUCTION OF THEIR SYNCHROGRAMS
The paper investigates the process of forming a single-thread chain stitch of type 101 under conditions of variable technological parameters. For the GK-9-2 type sewing machine, the functions of the position of the working bodies - the needle S(), the gear rack T(), the expander L() and Z(), the thread feeder U(), as well as the functions of the actual P(φ) and the required P′(φ) thread feed per one cycle of rotation of the main shaft - were experimentally determined. Approximation polynomials of the 6th order with a high degree of reliability (R² = 0.998÷0.9999) and an error of no more than ±0.25 mm or ±1.5° in angular coordinates were constructed for all functions. Comparison of the results obtained by graphical and analytical methods allowed us to verify the models and clarify the key points of interaction between the actuators (gripping the loop and its “stabbing” with the needle). The constructed functions were used to model the stitching process, taking into account changes in material thickness and stitch length, which made it possible to form a generalized synchronization of the machine. The analysis of the functions P(φ) and P′(φ) revealed significant discrepancies: at the minimum material thickness and short stitch, the excess of the actual thread feed is 64.4%, and at the maximum values, its shortage reaches 6.2%. The reason is the fixed feed law in the slider mechanism, which does not provide for adjustment. The obtained results emphasize the feasibility of developing adaptive mechanisms for thread feeding that can change its value depending on technological parameters. The presented analytical models can be used as a basis for further designing mechanisms that will ensure reliable connection of layers of multilayer textile compositions.
THE IMPACT OF ARTIFICIAL INTELLIGENCE ON THE OPTIMIZATION OF LOGISTICS PROCESSES IN THE FOOD INDUSTRY OF UKRAINE
The article analyzes the application of artificial intelligence in logistics processes within Ukraine's food industry, specifically warehouse automation, demand forecasting, and transportation condition monitoring. The integration of AI with IoT and robotic platforms facilitates the creation of intelligent logistics ecosystems that optimize inventory management and minimize food waste. The use of analytical tools, such as Power BI and Tableau, enables companies to efficiently process large data sets and improve forecasting accuracy. The described technological solutions help reduce costs, enhance logistics efficiency, and contribute to the sustainable development of the industry. AI plays a key role in shaping competitive logistics strategies, allowing enterprises to adapt to modern global standards and market challenges.
EXPERIMENTAL EQUIPMENT FOR DETERMINATION OF RATIONAL CUTTING MODES IN DRUM WOOD CHIPPERS
The ways of improving the schematic diagram of drum chippers of wood are analysed in order to obtain the largest possible percentage of technological chips of the right size and quality, primarily for the production of fuel pellets. It is noted that the components of obtaining wood chips of certain sizes in drum chippers are a number of factors that can generally be combined into two: the cutting mode and the design of the chipping chamber of technological chips. The features of the design of the experimental equipment produced are described, on which it will be possible to study the components of improving the drum chipper of wood with a high degree of accuracy.
STUDY OF THE IMPACT OF BLADE SHARPNESS ON SLICED VENEER QUALITY
This study outlines the conditions necessary to produce high-quality sliced veneer. We analyzed the specifics of sharpening knives for veneer slicing machines and identified deficiencies in the knife preparation process that reduce productivity. Research was conducted on the surface roughness of sliced veneer produced on a Cremona TZE 40 machine. A diagram was then constructed to show the relationship between surface roughness and the knife&#39;s cutting edge radius, as well as the number of double strokes of the flitch.
MATHEMATICAL MODEL OF THE PROCESS OF GRAIN MATERIAL TRANSPORTATION IN A PNEUMATIC CONVEYOR
For the movement of grain materials during their post-harvest processing, pneumatic screw conveyors are used, which ensure the movement of grain over considerable distances. The results of the analysis of kinematic-dynamic processes are presented, which are characteristic of two possible cases of complex movement or movement of grain material particles along the surface of the spiral turn of the screw conveyor - in the absence of oscillatory processes of the screw drum and in the presence of screw vibration. Based on the analysis of graphic constructions, it was established that the angle of deviation of a grain material particle during its movement along the spiral turn of the screw varies in the range of 0...72 degrees, and depending on the increase in the diameter and pitch of the screw, the deviation of the particle when changing the angle within 45...72 degrees has a direct character, i.e. increases, and in the range of 0...45 degrees - an inverse character, i.e. decreases. The obtained differential dependencies or mathematical models can be used to further substantiate the structural and kinematic parameters of pneumatic screw transport mechanisms.
ANALYSIS OF THE LIMITATIONS OF MACHINE LEARNING IN PREDICTING SPORTS RESULTS
This paper presents an experimental evaluation of the effectiveness of a predictive model based on machine learning algorithms. The key objective was to analyze the reasons for the discrepancies between predicted and actual results. The results of the experiments revealed a significant impact of dynamic and unpredictable factors (sudden injuries, changes in composition, team motivation, weather conditions) on the accuracy of predictions. The main limitations of existing statistical approaches were systematized and priority areas for further improvement of sports analytics methods were identified. The main result of the work is the identification of key challenges and justification of the need for new approaches to forecasting in the context of highly dynamic sporting events.
O.V. Durov, T.V. Stetsyuk, V.V. Poluyanskaya, A.I. Ievtushenko
A general overview of literature sources is presented and data analysis is carried out regarding the main parameters of zinc oxide (ZnO), its physical and chemical properties and the most important areas of application in the context of interaction with metals. Prospects for further research into the capillary and adhesive properties of ZnO-based ceramic materials are considered. The main properties of materials based on ZnO, their fabrication methods and their application are given. Key useful properties make ZnO valuable for a variety of applications: transparent electrodes, various sensors, energy-saving or heat-shielding windows, electronics, etc. Most of the research presented in the article is devoted to the interaction of ZnO with metals, since in a significant part of applications the close contact of zinc oxide with the metal plays a significant role. ZnO thin films, which can be obtained by chemical vapor deposition, magnetron sputtering, metal-organic vapor phase epitaxy, electrodeposition, pulsed laser deposition, sputtering, sol-gel synthesis, atomic layer deposition, spray pyrolysis, etc., are important for practical application.
RESEARCH ON THE EVOLUTIONARY DYNAMICS OF GENETIC STRATEGIES UNDER CONDITIONS OF VARIABLE RESOURCE AVAILABILITY
This paper is devoted to the experimental study of the influence of different resource availability regimes on evolutionary dynamics using a previously developed agent-based simulation. Five scenarios (from scarcity to extreme fluctuations) were analyzed, and the dependence of dominant genetic strategies and population stability on environmental conditions was revealed.
CAD IN THE DESIGN OF SMART ELECTRONIC DEVICES: ANALYSIS OF APPROACHES AND AN EXAMPLE OF AN IOT THERMOMETER
This paper explores the application of Computer-Aided Design (CAD) systems in the development of smart electronic devices integrated with Internet of Things (IoT) technologies. It provides an overview of modern software tools used for PCB design, microcontroller selection, and wireless communication setup. A particular focus is given to a practical example—the creation of a smart thermometer based on ESP32 and DS18B20 sensors. This case study demonstrates how automated design approaches enhance efficiency in IoT device development, optimizing hardware and software integration for real-world applications.
MODEL-BASED DESIGN AND CROSS-PLATFORM DEPLOYMENT OF WIND POWER PLANT CONTROLLERS
This paper presents a model-based development approach for wind power plant (WPP) control systems, emphasizing the adaptation of control algorithms to meet specific technical and regulatory requirements, including grid codes. The WPP controller is implemented in the MATLAB/Simulink environment, enabling automatic code generation in C/C++ and Structured Text for deployment on embedded platforms and programmable logic controllers (PLCs). To ensure interoperability with industry-standard simulation tools such as DIgSILENT PowerFactory and PSCAD, the approach includes generating dynamic link libraries (DLLs) conforming to the interface specification defined in IEC 61400-27-2:2020 (Annex G). The paper details the verification process by comparing the DLL-based implementation against the original Simulink model and demonstrates successful integration within external simulation environments. The proposed methodology accelerates the development, testing, and certification of WPP controllers. Future work includes extending the framework to support integration with aeroelastic models and digital twin platforms.
EXPERIMENTAL DETERMINATION OF THE USEFUL RESISTANCE FORCE IN MATERIAL MOVEMENT ON A SEWING MACHINE
The article identifies the maximum value of useful resistance force that arises during material transport in a sewing machine. This value is a key parameter in designing transport mechanisms. Experimental research confirmed that the useful resistance force significantly impacts the quality of the seam, and its consideration is essential for optimizing the sewing process. The resistance force is caused by various factors that are difficult to determine analytically, including the mass of material before the sewing zone, friction between the material and the worktable surface, as well as the human factor. Additionally, certain technological operations require extra tension of the material layers in the feed zone. Information on the quantitative values of resistance force and their impact on seam quality is absent in the literature. The aim of the study is to determine the effect of resistance force on seam quality. The results showed that with resistance force values up to 5 N and certain levels of presser foot pressure, seam quality remains stable, with stitch length variation not exceeding 10%. This value can be adopted when determining parameters for new fabric transport devices.
CONTROL OF FORMING PARAMETERS IN DEFORMATION BROACHING WITH THROUGH PLASTIC DEFORMATION
The article presents an in-depth literature review and examines the possibility of controlling forming parameters in the process of deforming broaching of workpieces made of ductile materials. Currently, this process is in demand, as it can be used not only for manufacturing new parts but also for restoring worn ones, offering several significant advantages over other restoration methods.Given the increasing requirements for product accuracy and quality, it is relevant to search for technological solutions that ensure controlled plastic deformation in worn areas of parts with an allowance for subsequent machining. The aim of this study is to investigate the possibility of controlling the forming parameters during through deforming broaching of ductile material parts, and to obtain dimensions with a machining allowance by selecting the geometry of the deforming tool and processing parameters.The literature analysis revealed that, in addition to the commonly observed deformations such as wall thinning, outer diameter expansion, and part shortening after processing, there are cases where the part elongates. This effect can potentially be used to compensate for end-face wear in axisymmetric parts. To confirm this phenomenon, numerical modeling of the process was conducted using the Finite Element Method (FEM). The simulation results showed that the deformation direction can indeed be influenced by the geometric parameters of the deforming element and the broaching conditions.The conclusions provide recommendations for selecting parameters that can be used in the design of processing technologies with controlled final dimensions, and directions for further research are outlined.
ANALYSIS OF RESOURCE CHARACTERISTICS OF USED HYDROABRASIVE MACHINES
The article analyzes the resource features of hydroabrasive machines, which are widely used in modern industry for processing various materials. The key factors affecting the service life of the main components of the equipment, such as water pressure, consumption of abrasive material, quality of water and abrasive, as well as the intensity of operation, are considered. The main nodes subject to the greatest wear and tear are identified, and ways to optimize their resource to increase the efficiency and economy of the technological process are proposed. This extended abstract is devoted to an in-depth analysis of the resource characteristics of water-abrasive machines, which are becoming more and more common in various industries due to their versatility and ability to process a wide range of materials. The study covers key aspects related to resource efficiency, operating cost optimization and environmental impact.
EFFICIENCY OF FACE FINISHING MILLING OF CAST IRON WITH VERMICULAR GRAPHITE BY TOOLS MADE OF CUBIC BORON NITRIDE AND NITRIDE CERAMICS
The article presents the summary results of experimental studies of the influence of cutting modes and type of tool material on tool wear, surface quality parameters, and microstructure of the machined layer of cast iron with vermicular graphite of CGI450 grade during face finishing milling. The Box-Behnken method was used to plan the experiment and a multiple criteria approach was applied. This made it possible to investigate the mutual influence of the main machining parameters - cutting speed, feed per tooth and depth of cut - on the key performance criteria of the finishing face milling process.These include: tool wear (VB), machined surface roughness (Ra), milling process productivity (MRR). During the study, tools made of cubic boron nitride (CBN) and nitride ceramics (NC) were compared. It turned out that BNB provides the formation of a hardened surface layer with high residual compressive stresses (up to -166.42 MPa), a crushed matrix structure, and increased microdeformations. This indicates intensive surface hardening. The surface roughness is 0.16 < Ra ≤ 0.63 μm. Tools made of NK demonstrate slightly higher wear resistance and machining stability at high cutting speeds. However, they have less pronounced structural strengthening and are characterized by slightly worse Ra parameters. In addition, an economic assessment was made, which took into account the cost of the tool and the cost of machining one kilometer of cutting path. As a result, it was found that in the finishing modes of HSS milling (cutting speed 400-800 m/min, feed rate 0.1-0.15 mm/tooth, cutting depth 0.08-0.15 mm), the use of round-shaped cutting inserts made of nitride ceramics is much more cost-effective than CBN inserts. Based on the analysis of the obtained results, recommendations for the choice of tool material depending on the production priority were formulated: CBN - to achieve maximum surface quality and increased wear resistance of the surface layer; Nitride ceramics - to ensure cost-effectiveness and process stability during serial processing. The data presented here can be used to optimize the milling process of cast irons with vermicular graphite in critical machine-building production.
APPLICATION OF MODERNIZED TECHNOLOGY OF ROUGH PROCESSING OF DETAILS AT HIGH-SPEED TRAJECTORIES
The article presents the results of a study of the application of modernized technology of rough processing of parts using high-speed tool trajectories. The impact of optimized machining strategies on productivity, quality of machined surface and tool wear is considered.The advantages and limitations of using this approach to increase the efficiency of production processes are analyzed.
KINETICS OF ANNEALING OF RADIATION DEFECTS IN ELECTRON-IRRADIATED n-Ge
The kinetic equations for describing the isothermal annealing of germanium single crystals, doped by the antimony impurity with the concentration of Nd=5·1014 cm-3, irradiated by the electrons with the energy of 10 MeV and a flow of Ω=5·1015 el/cm2, were obtained. The annealing activation energy for complexes and disordered regions based on the experimental results of the temperature dependence of the Hall coefficient and the calculated concentration values of the VOіI2Ge complexes, created during irradiation and annealing in germanium single crystals, was determined. The results show that the cores of the disordered regions are less thermally stable than the VOіI2Ge complexes.
DIRECTIONS FOR IMPROVING THE DESIGNS OF PLANER MACHINES
The analysis of research directions on orthogonal circular sawmills is provided. The impact on cutting precision by a horizontal saw is considered: log base system, saw attachment method, and cutting process specifics. The need for thorough scientific research on the influence of these factors on cutting precision is established.
RESEARCH OF THE PROPERTIES OF THE AROMATIC POLYAMIDE PHENYLON C-2
The main thermophysical, physical-mechanical and tribological properties of the aromatic polyamide phenylone C-2 have been studied. It has been established that the polymer has high values of thermal conductivity coefficient and strength characteristics, excellent wear resistance, low friction coefficient and performance criterion PV up to 1.6 MPa · m/s while working in frictional conditions without lubrication. The results of the study allow us to recommend phenylone C-2 for use as a polymer binder for the purpose of creating new polymer composites for structural purposes.
DEVELOPMENT OF REGRESSION MODELS FOR CALCULATING EFFECTIVE CUTTING MODES OF 12 MM STAINLESS STEEL BY HIGH-POWER FIBER OPTIC LASER RADIATION
The paper presents the results of experimental and theoretical studies of the patterns of influence of the pressure of the assist gas (nitrogen), the focus position relative to the surface of the part, and the cutting speed on the roughness parameters of the obtained surfaces when cutting 12 mm stainless steel AISI 304 using a 12 kW fiber laser. Based on the results of a systematic complex of experimental studies using the Statistica package, regression models of the process were obtained, their accuracy and adequacy were substantiated. Experimental verification confirmed the effectiveness of using the most accurate regression model to determine the parameters of the modes that ensure high quality and productivity of cutting.
SCIENTIFIC AND METHODOLOGICAL ASPECTS OF IMPLEMENTING DISTANCE LEARNING TECHNOLOGIES IN TECHNICAL DISCIPLINES
The article is devoted to the development of scientific and methodological foundations of distance learning technologies in technical disciplines and the creation of an effective process of forming an informational resource during training monitoring. There is a list of tasks that need to be solved to form an informational resource for distant learning process management systems presented. As well as functional modules of distance testing technology are proposed. These modules implement a system of procedures for generating new information that enables training and knowledge control. But at the same time it gives an opportunity to receive success reports at various stages of control for a higher educational applicant, teacher or any structural unit of educational institution. The results of knowledge tests of higher educational students allow for effective adjustment of the focus, intensity and methods of learning.