National University of Science and Technology

Stroke is an important medical and social problem leading to high disability of post-stroke patients. To restore the health of patients, comprehensive and long-term medical rehabilitation programs are required at all periods of rehabilitation treatment. Telemedicine technologies are increasingly used in the medical rehabilitation of post-stroke patients; their use increases the coverage and accessibility of medical care, ensures continuity of rehabilitation, and improves the health recovery rates of patients. The purpose of the article is to study and develop a questionnaire for surveying healthcare professionals on the use of telemedicine technologies in medical rehabilitation of patients after stroke. Materials and methods. The methods of analytical, information search and other scientific means were applied in accordance with the set goal. In developing the questionnaire, open, closed and semi-closed questions were used, as well as the Likert scale for measuring the degree of agreement or disagreement of respondents with various statements, which contributes to a more in-depth analysis of information. Results and discussion. As a result of the study, a questionnaire for surveying healthcare professionals on the use of telemedicine technologies in the medical rehabilitation of post-stroke patients was developed. When developing the questionnaire, the following areas were taken into account by groups of research questions: general characteristics of respondents, use of digital and telemedicine technologies, benefits of telemedicine technologies, medical, organizational and managerial aspects of improving medical rehabilitation. Conclusions. The survey using the developed questionnaire will make it possible to study and develop organizational and managerial decisions to improve medical rehabilitation of post-stroke patients using telemedicine technologies. The results of the study can become the basis for improving the medical and social health indicators of patients, contributing to the prevention of secondary strokes, and increasing the access and coverage of healthcare.

The microstructure and phase composition in the as-cast and homogenized states, recrystallization behavior, tensile properties and electrical conductivity in the rolled and annealed states of the Al-Cu-Ni-Y(Er,Yb,Gd) alloys were investigated in details. The Ni substituted the Cu atoms in the crystal structure of the Al8Cu4REM and Al3REM phases as was demonstrated by scanning electron microscopy and x-ray diffraction analyzes. The intermetallic phases in the alloys were fragmentized, spheroidized and grew to about 1 µm size after 1 h of homogenization annealing at 585-595 °C. The REM and Ni have effect on the Al2Cu phase solvus and decrease significantly the volume fraction of the phase at 180-250 °C in the Al-Cu-Ni-REM alloys. The recrystallization behavior of the investigated alloys is different. Completely recrystallized structure was found in the AlCuNiEr alloy that confirmed by the lowest hardness after 1 h of annealing at 250 °C. The highest hardness was achieved in the AlCuNiGd alloy with lower fraction of the recrystallized microstructure. The alloys annealed at 150 °C for 1 demonstrate he the highest UTS of 252-273 MPa at the lowest elongation of 3-4.5% and 52.8-54%IACS. The best combination of the UTS (275 MPa) and electrical conductivity (53.5%IACS) was achieved in the AlCuNiGd alloy after 1 h of annealing at 150 °C. The 100 h of annealing at 250 °C slightly decreases the UTS to 138-143 MPa, and provide the highest elongation about of 29% and electrical conductivity of 57%. Investigated alloys demonstrate a good combination of tensile strength and electrical conductivity and can be base for developed novel alloy for high-temperature application.

The CCM productivity and the quality of steel blanks largely depend on how well the mold meets all technological requirements, the main of which is to ensure the necessary uniformity and intensity of heat removal from the ingot shell without collapsing under the exposure to heat from the steel melt, ferrostatic pressure of the liquid phase, and thermal cracking. Mold tubes are the main replaceable tool of the molds of the modern billet and bloom casters. They represent high-tech products manufactured with high precision, and contain a special wear-resistant coating applied to their working surface.

Modern conditions for the development of the metallurgical industry require improved approaches to its digital transformation. Managing the digital transformation of the metallurgical industry is a complex process aimed at adapting metallurgical companies to the conditions of the digital economy. The introduction of digital technologies to digitalize the business processes of metallurgical companies should be carried out on the basis of the existing potential of the industry, primarily innovative. The level of digital maturity of the metallurgical industry depends on many factors that need to be identified and evaluated. A significant point in the implementation of digital transformation projects is the consideration of project risks, since the success of such projects depends to a high extent on the level of response to these risks. Thus, now there is a need to identify significant problems hindering the digital transformation of the metallurgical industry. The purpose of this study is to identify significant problems related to the development of digitalization processes at the level of the metallurgical industry based on the analysis of the concepts of digital transformation management of metallurgical companies. The study used a comparative analysis of domestic and foreign sources, a comparative analysis of sources, statistical methods, and a methodology for assessing innovative potential. As a result, the main problems of the metallurgical industry in the field of digital transformation were identified.

The relevance of the research topic is pre-determined by the issue of improving the quality of education, requiring the development of an integrative model of the educational environment for art schools in the digital age. The problem of the research is the integration of augmented reality digital tools and teachers’ digital competencies into the training young artists as part of the integrate educational environment of the art school. The subsequent task is the eliciting the competencies that an arts teacher should develop for successful teaching performance in an integrative educational environment and ensuring its sustainable functioning. The aim of the study is to theoretically substantiate, develop and test an integrative model for the formation of the integrate educational environment of an art school using augmented reality technology. The targeted model is focused on the gradual expansion of pedagogical resources for teaching young artists by appropriate use of digital data and tools. It admits appropriate complement of traditional educational technologies with digital ones in order to ensure high quality of education and vocational training, advanced personal and aesthetic-creative development of learners. It presupposes development of blended educational environment and purposeful application of augmented reality techniques. The research hypothesis: Integrated educational environment model will prove efficient under the following condition: (a) augmented reality educational techniques application; (b) fine arts teachers expand digital skills in applying AR techniques; (c) fine arts teachers apply augmented reality (and augmented virtuality) techniques. The methodology of the research is based on systemic, complementary and complex approaches. Pedagogical experimentation was conducted to collect empirical research data. Statistical analysis was applied in input and output data interpretation. Key research results: the content and structure of the integrated educational environment of an art school defined; digital and professional competencies of a teacher of fine arts de-scribed; an integrative model of the formation of an educational environment of an art school using augmented reality technology developed and tested. The integrative model of the art school educational environment ensures formation of young artists’ aesthetic culture in unity of their personal, artistic, creative and art criticism competencies.

This study employed a multifactorial analysis, varying Alumina concentration, spinning distance, and applied voltage, to fabricate polyvinyl alcohol/Alumina nanocomposite mats via electrospinning, with the aim of controlling and optimizing fiber thickness. A two-factor interaction model was identified as the best fit for the data, achieving a high coefficient of determination (R² = 0.98). The morphological characteristics of the electrospun mats were assessed through scanning electron microscopy to measure the average fiber diameter (AFD) for each mat. Results indicated that applied voltage has the most pronounced effect on AFD, with fiber diameter decreasing as voltage increases. According to the model, the optimal conditions for producing the thinnest fibers are an Alumina concentration of 1.9%, a spinning distance of 19 cm, and a voltage of 25 kV. Under these conditions, the predicted and actual AFD values were 186 nm and 178 nm, respectively, demonstrating correlation accuracy within acceptable error margins. Fibers prepared under optimal conditions were further characterized using TEM/EDX, FTIR, XRD, biocompatibility testing, and contact angle measurements. These analyses revealed that incorporating Alumina enhances the hydrophobicity and water resistance of electrospun PVA fibers.

The growing uncertainty of the development of the world economy, the speed of transformational changes, and intra- and intersectoral instability cause the need for a predictive scientific vision of the world economic future. This research examines international strategic change models and appraises current worldwide trends, considering development forecasts in the chemical industry as an illustrative example and accounting for technological and scientific advancement. The authors conducted a comparative analysis of predictive models of global economic development in combination with scenario analysis using the chemical industry as an example. The validity and reliability of the obtained results of the analysis and conclusions are conditioned by the use of general scientific and unique methods of scientific cognition, including retrospective and system analysis, methods of comparison and generalization, and normative and comparative statistical analysis. The authors analyzed various forecast models emphasizing the prospect of transition to a carbon-neutral economy, considering the transforming foreign policy trends and the digital transformation trend. The research emphasizes the necessity and relevance of adjustments to forecasts for the short and medium term, considering the dynamics of the foreign policy environment and post-pandemic consequences. The analysis of existing and future programs, strategies, and scenarios of change across multiple countries concerning the development of a carbon-neutral, waste-free economy resulted in identifying trends within the evolution of the chemicals industry based on the analysis of the development of the chemical industry. They also demonstrated the importance of scientific forecasting, which is necessary for industry development.

Aperiodically Poled Piezoelectric Film (APPF) stacks have recently been proposed as an extension of Periodically Poled Piezoelectric Film (P3F) structures, a promising platform for the expansion of radio frequency filters into cm-and mm-wave frequency bands. Variations in the thicknesses between the layers of the APPF stacks enable the generation of higher-order modes typically absent in P3F structures and provide additional options for the design of high-frequency filters. In this study, a simple model is proposed to optimize the thickness ratio in a three-layered structure for the generation or suppression of any mode. Its validity was confirmed by the rigorously simulated admittance functions of the resonators based on optimal structures and comparison with experimental data. The coupling coefficients of modes A1-A11 laterally excited in the 128?YX LN-based three-layered stacks were calculated as functions of the continuously varying thickness ratios. These dependencies can be used for the selection of APPF stacks with simultaneous enhancement of the primary mode and suppression of the undesired modes. In the analyzed LN plates of thickness 600 nm, the electromechanical coupling coefficients of the modes A5 and A7 generated at the frequencies 14.6 GHz and 20.4 GHz increased from 2.4% to 17% and from 1.2% to 9.9%, respectively, when the inverted middle layer of the optimal thickness was introduced, whereas the nearest modes were suppressed. The appearance of spurious symmetric modes in the previously reported experimental P3F structures was explained and the geometry of the stacks required to avoid these spurious modes is described.