bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ethnophysics concepts analysis: Traditional vs. modern game in lato-lato and Newton’s pendulum
Authors: Arisanti A , Nurlailiyah Alfi , Lestari N A , Misbah  , Deta U A , Prahani B K 
Published: December 2024

Abstract
The vast cultural legacy of Indonesia provides valuable materials for educational applications. An exemplary instance is the conventional game of lato-lato, which encompasses fundamental physics principles, such as momentum. Lato-lato, similar to Newton’s pendulum, demonstrates the concepts of momentum, the conservation of energy, and the coefficient of restitution by showcasing ball collisions. Although the devices have distinct features, they exhibit the principles of momentum and energy conservation, as well as the properties of elastic collisions. The principle of energy conservation in these systems emphasizes the transformation of potential energy into kinetic energy, with the efficiency affected by the restitution coefficient. Furthermore, the principle of conservation of momentum guarantees that the overall momentum remains constant without any external influences. Incorporating lato-lato into physics teaching offers a novel and captivating method to enhance students’ understanding of these essential physics principles.
Performance test of brushless direct current (BLDC) generator in micro hydro power plant (MHPP) with Archimedes screw turbine
Authors: Bustomi M A , Setiawan F B , Indarto B , Purwanti E 
Published: December 2024

Abstract
Brushless Direct Current (BLDC) generators have many advantages over DC generators that use brushes. In this research, the advantages of the BLDC generator are applied as a generator for a micro-hydro power plant (MHPP) that uses an Archimedes screw turbine. The study aims to test the performance of the BLDC generator as a generator on the Archimedes screw turbine MHPP. The MHPP specifications for the Archimedes screw turbine used in this research are an Archimedes screw turbine with three blades, an elevation angle of 40° and a transmission gear ratio of 2.8:1. The screw turbine has an inner diameter of 14.02 cm, an outer diameter of 23.9 cm, a pitch of 25.67 cm and a length of 51.34 cm. The generator used is a 3-phase Brushless Direct Current (BLDC) generator. The load used is a 12 Volt LED lamp with a 5 to 20 Watts power. The test results at a discharge of 0.00634 m3/s showed that the mechanical power was (36.408 ± 0.202) Watts and the highest electrical power was (7.86 ± 0.03) Watts. Based on these results, the efficiency of electrical power on mechanical power is around 22%.
Computational modeling of parabolic motion with air resistance using scratch programming
Authors: Taufiq M , Kaniawati I , Liliasari  , Samsudin A 
Published: December 2024

Abstract
Parabolic motion, a fundamental concept in physics, becomes significantly more complex when air resistance is considered. Traditional analytical methods often need to provide accurate solutions, necessitating computational approaches. This research aims to develop a computational model to simulate parabolic motion with air resistance using Scratch programming. This research applies a development method with a modified waterfall model. The phase of the waterfall model applied in this research include defining, designing, developing, testing, and analyzing. The computational modeling of parabolic motion with air resistance using Scratch programming employs the Euler method to solve the differential equations. The model uses horizontal and vertical motion components, integrating air resistance effects. The developed Scratch program successfully simulates the projectile’s trajectory, showcasing the significant impact of air resistance on parabolic motion. The results illustrate how air resistance causes deviations from ideal parabolic paths, leading to shorter ranges and altered apex heights. This research concludes that a computational model was produced to simulate parabolic motion with air resistance using Scratch programming that highlights the potential of Scratch as a tool for computational physics, making complex numerical methods accessible to beginners. Integrating the Euler method within Scratch presents a novel approach to teaching and understanding projectile motion with air resistance. The research contributes to science education by providing an engaging, interactive platform for students to explore and understand advanced concepts in mechanics. Furthermore, this approach can be adapted for various other physical phenomena, broadening the scope of its application in educational settings.
Patterns of PM10 particles change in the atmospheric air of Ivano-Frankivsk city
Authors: Adamenko S Y , Arkhypova L M , Adamenko Y O , Moskalchuk N M , Glibovytska N I , Chupa V M 
Published: December 2024

Abstract
PM is one of the main atmospheric air pollutants causing serious concern for public health. New evidence on health effects of PM has led to the publication of new WHO air quality guidelines. Spatio-temporal patterns of PM10 change are a current topic in atmospheric and environmental sciences. An equally important aspect is the study of the relationship between PM10 concentration and meteorological characteristics. Temperature, humidity, wind and atmospheric pressure can affect the concentration, distribution and transport of PM10. The database for the study included measurements of PM10 concentration, air temperature, atmospheric pressure, and relative humidity for 306 days in 2019 (from March 1 to December 31) every hour, a total of 7,344 for each parameter from the Ecocity public monitoring station in the central part of Ivano-Frankivsk city. There are no significant stationary pollution sources and highways near the observation site. Certain regularities were found in the daily variation of PM10 concentration: sharp increase in concentrations at night with a peak around midnight, decrease during the day (minimum around 16:00). The proposed sinusoidal model fairly well reflects the distribution of data in the morning hours, from 5 to 11 am. Significant fluctuations in daily concentrations (from 0 to 100 μg/m3) were observed, especially in the cold period of the year. The highest average monthly values of PM10 are in March, the lowest are in July. The current average daily limit value in Ukraine and the EU is 50 μg/m3 (no more than 35 exceedances per year), 442 instantaneous indicators above the norm. When analyzing the relationship between PM10 concentrations and air temperature, the regularity is observed both during the day and throughout the year (in cold periods, the concentration of particles is higher, which can be explained by lower air temperatures). The patterns identified are related to a number of factors, such as meteorological conditions, pollution sources, and atmospheric chemistry. Multivariate linear regression was used to find the mathematical relationship between the average monthly values of PM10 concentration, humidity and air temperature. The coefficient of determination R
2 = 0.67, Fisher’s test F = 70.95 and the mean square error MSE = 23.12. On the basis of this, it can be stated that the model is acceptable for estimating and forecasting temporal patterns of the concentration of PM10 particles in the atmospheric air of Ivano-Frankivsk, depending on the average monthly indicators of humidity and atmospheric air temperature.
Research on influence of stress-strain evolution in immediate floor before and after excavation face on origin floor heave in coal mines roadways
Authors: Sakhno I , Sakhno S , Isaienkov O , Petrenko A 
Published: December 2024

Abstract
The floor heave is one of the most acute issues of underground mine roadways stability problem. With an increase in mine depth, the floor heave becomes more dramatic. Analysis shows that rock bolts reinforcement is the most advanced and worldwide method of floor heave control. The current mine roadway support systems in Ukraine usually do not provide measures to floor heave control. As a result, floor heave values exceed 0.7-1.0 m, which leads to disruption of transport chains and failure of ventilation regime. In this paper, for the typical conditions of coal mines located in Pokrovsky, Dobropilsky districts and Western Donbass, stress-strain evolution in roadway’s bottom before and after excavation face was studied. Ansys code was used to analyze the evolution of stress and strain in immediate floor of roadway before and after excavation face. It was found that rocks in immediate floor undergo cyclic loading and alternating strains. Before and after excavation face a zone of increased stress and a stress relief zone are formed respectively. Thus, in the immediate floor behind the excavation face cracks are formed and structurally defects are branched. This initiates the origin of floor heave process. The control of the immediate floor delamination after excavation face can be ensured by a timely installation of rock bolts in the excavation face with their inclination to roadway face. The most appropriate bolt inclination coincides with the contour of the stress concentration zone, which can be determined from the results of numerical modeling.
Predictive calculation of blasting quality as a tool for estimation of production cost and investment attractiveness of a mineral deposit development
Authors: Hryhoriev Y , Lutsenko S , Shvets Y , Kuttybayev A , Mukhamedyarova N 
Published: December 2024

Abstract
This study delves into the importance of ensuring the necessary degree of rock crushing in open pit mining technology and its profound impact on extraction, loading operations, and overall production processes. The degree of rock crushing significantly influences excavation and transportation costs, making it a pivotal factor in determining the total cost of mining operations. Traditionally, empirical formulas have been used to establish the dependence of granulometric composition of blasted rocks on rock properties and technological factors. However, this study emphasizes the need for a multifactorial model to predict rock crushing quality, incorporating characteristics of rock massifs, explosives, and specific costs. By doing so, it aims to enhance the efficiency of open-pit mining technology and evaluate the investment attractiveness of deposit development at the pre-project stage. The study also explores the use of linear regression analysis and non-linear search methods to determine the parameters for predictive calculations of blasting quality. The research offers valuable insights into optimizing blasting approaches and minimizing operational costs in open-cast mining operations, thereby contributing to the sustainable development of mineral deposits.
Analysis of quantitative and qualitative parameters of gas mixture in thermal processes of mine medium
Authors: Kliuiev E S , Ahaiev R A , Ye Dudlia K , Vlasenko V V , Zberovskyi V V 
Published: December 2024

Abstract
The article examines the problem of the occurrence and spread of fires in mines caused by the increased emission of methane and coal dust. The method of mining space isolation with the help of fire-prevention stopping, reducing the oxygen concentration and creating an inert medium, was studied. It has been experimentally established that thermal action on coal without air access causes the formation of combustible gases such as methane, carbon monoxide, hydrogen and unsaturated hydrocarbons. The peculiarities of the formation of a multicomponent gas mixture in the temperature range from 400 to 900°C were determined. High temperature causes a gas phase yield rise, which leads to an increase in its heat of combustion according to a quadratic dependence. It was found that the methane yield increases up to 600°C, and then its decrease in the gas mixture is observed due to decomposition into hydrogen and atomic carbon at temperatures above 700°C.High values of combustion heat of gases are determined by methane at temperatures up to 800°C, after which the influence of hydrogen rises with high temperatures. The obtained data of the gas mixtures combustion heat make it possible to establish the qualitative and quantitative parameters of the thermal process occurring in the isolated mining space. This can be used to calculate the heat balance of the mining medium and to simulate the thermodynamic processes occurring during mining fires.
Areas of the nature reserve fund use in the context of sustainable development
Authors: Koshkalda I , Dombrovska O , Gurskienė V , Kniaz O , Stoiko N 
Published: December 2024

Abstract
The study is aimed at analysing the conditions and prospects of the nature reserve fund development of the Kharkiv region in order to develop recommendations for optimising the management and conservation of natural resources in the sustainable development context. The nature reserve fund is an important component of the sustainable development model, contributing to the conservation of biodiversity, maintaining the sustainability of natural ecosystems, environmental education and recreation. The article examines the problem of slowing down the formation pace of new territories and objects of the nature reserve fund (NRF) in Kharkiv region and in Ukraine as a whole, which is a consequence of the current socio-economic situation. The authors of the article believe that to solve this problem, it is necessary to amend the current legislation, in particular, to simplify the procedures for creating new NRF objects and to introduce economic measures to encourage land users and landowners to create such objects. It is noted that the existing protected area rate in Kharkiv region, although exceeding the average rate in Ukraine, is still lower than in neighbouring European countries. The problematic issues are compounded by the lack of a clear strategy for the development of protected areas and the lack of the management system coordination at the state and regional levels. To solve these problems, it is necessary to ensure the implementation of a set of measures, such as the creation of a scientifically based network of protected areas and objects and a system of balanced nature management. The article offers a set of measures to intensify the processes aimed at achieving Goal 15 in Ukraine, in particular, to intensify the work of local authorities to create new territories and objects of the nature reserve fund.
Application of polymer flooding to increase oil recovery
Authors: Pashchenko O A , Borodina N A , Yavorska O O , Ishkov V V , Cherniaiev O V 
Published: December 2024

Abstract
This article examines the problem of non-uniform oil displacement during the development of multi-layer fields and proposes a promising approach to solve it – polymer flooding. The article outlines the basic principles of polymer flooding, including dissolving polymers in water to increase viscosity and reduce water mobility. Various types of polymers used in this technology and their unique characteristics are considered. The advantages of polymer flooding are highlighted, such as increasing reservoir coverage and increasing oil production efficiency. The illustrations presented in the article compare oil displacement using polymer flooding and traditional methods. In conclusion, a comparative description of various types of polymers in terms of composition and main application parameters is given and the importance of this technology in the context of ensuring sustainable and efficient oil production in multi-layer fields is substantiated.
The income, consumer spending and wellbeing of Ukrainian households
Authors: Verba D V , Kotenok A G , Kotenok D M 
Published: December 2024

Abstract
This article is devoted to the refinement of factors determining the structure of Ukrainian households’ consumption spending and approaches to interpretation of shifts in such structure in context of population well-being. It contains analysis with using indexes of real volume of consumption, combined with the localization of causes determining fluctuations in relative prices by commodity group. The results of such analysis should create preconditions to clarify the contribution of certain industries and commodity groups in the dynamics of consumer welfare. For estimating the income and price elasticity of consumption by wide aggregated commodity groups the linear modeling was used. Authors have used quite simple linear additive function, the first element of which is close to Working function, and the second – a very simplified replacement of Theil proposed mathematical tools for incorporating relative prices into mentioned model. The elasticity coefficients, calculated on basic our model were compared with coefficients obtained by Seale Jr. and Regmi [1]. For five commodity categories, we also compared the actual indices of real changes in quantity of consumption with similar indicators, which were calculated on basis the elasticity coefficients, obtained in our and mentioned works. Elasticity coefficients are designed by Seale Jr. and Regmi [1] for “Food” and “Furnishings, household equipment and routine maintenance of the house” have demonstrated quite good explanatory power. But estimated figures for both models clearly deviate from the actual values, which were observed for “Clothing and footwear”, as well as for “Housing, water, electricity, gas and other fuels”. At last, we try to explain the causes determining such deviation of actual scale of consumption comparing with calculated on basis elasticity coefficients and create precondition for better understanding connection of observed change in consumption of such commodity group with level of population’s well-being.
Ukrainian social sector development in contemporary conditions: problems and areas for their solution
Authors: Lopushniak H S , Kytsak T G , Verkhovod I S , Osadchyi V V , Ryabokon I O 
Published: December 2024

Abstract
The article is devoted to the adaptation of social policy’s conceptual framework to war conditions, radical growth of defense spending, which, against the background of production infrastructure destruction and declining business activity, lead to critical underfunding of social sector. The authors emphasize the priority of population’s quality of life characteristics as a criterion for assessing functioning of social sector’s clusters and a basis for updating social policy’s principles and priorities. The study identified the main social sector development problems, which primarily include: limited resources in response to the social sector’s growing needs, including social protection; reduced access to medical and educational services; insufficiently effective reforms during the period of war; depopulation; increased migration flows, etc. The following priority areas have been identified for their resolution: creation of conditions for increasing the birth rate, and socialization of senior citizens; effective migration policy; reforming the wage system; simplifying access to professional pre-university and higher education; adapting the network of medical institutions to population’s growing needs; preserving and restoring social infrastructure, etc. Development and implementation of measures within the mentioned areas will contribute to social sector development and, accordingly, to the improvement of population’s quality of life.
Thermo-responsive hydrogels based on gelatin-alginate composition with humic acids intended for controlled drug delivery
Authors: Lebedeva K O , Lebedev V V , Klochko N P , Cherkashina A M , Bogoyavlenska O V , Miroshnichenko D V 
Published: December 2024

Abstract
The purpose of this work is to create a bioactive “smart” thermo-responsive hydrogel, which, when exposed to the body with a physiological temperature of 37°C, reversibly turns into a sol, which can be used to introduce drugs into hard-to-reach places, for local and long-term delivery of drugs, as well as for reducing doses of delivered drugs. Herein, we developed and studied hydrogel systems containing gelatin, sodium alginate and humic acids. All natural molecular polymers used are low cost and have non-toxic, biocompatible, biodegradable and non-immunogenic properties. In addition, using our own technology, humic acids with antioxidant, antibacterial and anti-inflammatory activity were obtained from lignite, which provided a concrete chance for the technological use of humic acids in accordance with the “waste-to-wealth” approach. Rheological studies confirmed that the hydrogel containing 14 %wt.gelatin and 6.4 %wt. sodium alginate is thermo-reponsive and has a gel-sol transition, manifested in a sharp decrease in its kinematic viscosity at a physiological temperature of 37°C. The FTIR spectra of the gelatin-sodium alginate-H2O and gelatin-sodium alginate-humic acids-H2O systems turned out to be similar. The small red and blue shifts in stretching and bending vibration positions occurred due to gelatin-sodium alginate, gelatin-humic acids and sodium alginate-humic acids interactions, and are similar to those observed in the literature, in particular due to a conformational change in the secondary structure of gelatin. The results of a study of the gel-sol transition time at a physiological temperature of 37°C for samples of the developed thermo-responsive bioactive gelatin-alginate hydrogel containing 6.4 %wt. sodium alginate and 14%wt. gelatin, as well as samples of this hydrogel modified with different contents of humic acids, visually showed a sharp increase in the transition time from 6 min to 11 min as a result of adding 2.5 %wt.humic acids. Thus, these studies showed that relatively small concentrations of humic acids can provide a prolonged drug delivery effect through the use of gelatin-sodium alginate hydrogel modified with humic acids on the surface of the human body.
Development of the modeling system core for severe plastic deformation processes
Authors: Tarasov O F , Altukhov O V , Vasylieva L V 
Published: December 2024

Abstract
The research is focused on the development of the structure of the core of the integrated automated modeling system (AMS). The AMS ensures an increase in the functionality of the CAD and CAE systems by combining them with several external independent modules. The AMS modeling technological schemes of severe plastic deformation processes, the behavior of materials in deformation processes, and reducing the cost of choosing the scheme and parameters of the deformation processes. Object-oriented software was developed to analyze the influence of different initial shapes of the billets and the die sets on the changes in the billet’s cross-section during deformation. The software is written in C# using the WPF interface and the page structure of the main application window. Using parametric models of processes enables automated calculations in CAE systems and the generation of 3D geometric models of die sets in CAD systems. The design of experiments allows automation research of severe plastic deformation (SPD) processes and reduces the costs of studies. Importing and accumulating calculation results in the CAE system made it possible to find the optimal values of the parameters of SPD technological processes. The parameters of the deformation models obtained based on modeling are the basis for constructing the geometry of the die set in CAD with subsequent integration with CAE to calculate the stress-strain state in the volume of the billet. Ways to expand software functions to support various SPD processes are proposed.