Technical Faculty in Bor
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Recent Submissions
Investigation of thermal properties of Al–Cu eutectic alloy for phase change energy storage applications
(Springer, 2025) Manasijević, Dragan; Balanović, Ljubiša; Cimpoesu, Nicanor; Markovic, Ivana; Gorgievski, Milan; Stamenković, Uroš; Stepanović, Aleksandra
The knowledge of thermal properties such as thermal conductivity, specific heat, and latent heat of melting is essential for the development of phase change materials (PCMs) for latent heat energy storage applications. Due to their good properties, aluminum-based eutectic alloys have become the most widely studied metal-based PCMs. In the present study, microstructure, thermal diffusivity, thermal conductivity, specific heat capacity, and latent heat of melting of the Al-33.6 mass% Cu eutectic alloy were examined using scanning electron microscopy, energy dispersion spectroscopy, differential scanning calorimetry, and light flash method. The results show that the microstructure of the investigated alloy consists of fine and coarse (Al) + Al2Cu eutectic regions. Specific heat, thermal diffusivity, and thermal conductivity increase with increasing temperature in the temperature range 25–400 °C. The thermal conductivity of the studied alloy at room temperature is 134.3 Wm−1 K−1. The measured latent heat is 319.5 Jg−1. The obtained results indicate that the Al–Cu eutectic alloy has considerable potential for application in the field of phase change energy storage materials.
Tekstilna industrija
(Savez inženjera i tehničara tekstilaca Srbije, 2024) Urošević, Snežana; Urošević, Snežana
Effect of Chemical Composition on the Corrosion Resistance, Microstructure, Hardness and Electrical Conductivity of the Ge–In–Sn Alloys
(Springer, 2023) Zečević, Milena; Tosković, Nemanja; Đorđević, Aleksandar; Minić, Duško; Tošković, Dragan; Kolarević, Milan; Ristić, Vladica; Tasić, Žaklina
This paper presents the results of experimental and analytical testing of the ternary Ge–In–Sn system.
Experimental part includes results of the corrosion resistance, microstructure, hardness and electrical properties of the selected ternary Ge–In–Sn alloys. The prepared alloys were tested using X-ray powder diffraction (XRD) method, scanning electron microscopy with energy dispersive spectrometry (SEMEDS), hardness and electrical conductivity tests. For the obtained values of hardness and electrical conductivity, a mathematical model was used in order to determine the properties of the alloy in the entire range of the composition. The results of the Brinell hardness test show that the Ge80In10Sn10 ternary alloy has the highest hardness of all tested ternary alloys, 254.2 MN/m2 . While, results of the electrical conductivity test show that the Ge10In10Sn80 ternary alloy has the highest conductivity of all tested ternary alloys and the highest corrosion resistance. Calculated isothermal section at 25 C, were confirmed with XRD and EDS results.
The Granger causality of digital connectivity and trade globalization in the health crisis
(University of Belgrade, Technical Faculty in Bor, 2024) Petkovski, Ivana; Fedajev, Aleksandra; Milošević, Isidora
The widespread adoption of digital technology in the last decade has caused global changes, leading to the belief that technology is altering the global connectivity of economies. This is especially emphasized in light of the global health crisis in 2020. To efficiently monitor this process, it is vital to assess the anticipatory potential of this type of digital connectivity and the growth of globalization in trade. An effective analysis of this issue necessitates looking into the causative relationship between digital technology connections and trade globalization. This is performed by applying the statistical approach of Granger causality to a data set consisting of 35 European countries from 2010 to 2022. A Granger causality study was performed using the lag value estimated based on the Akaike information criterion, which equals 2. The findings suggested that there is a unidirectional causal relationship between active mobile-broadband subscriptions and imports, with the former influencing the latter. However, this causal relationship fails to be valid in the opposite direction. The examination revealed a reciprocal relationship between fixed-telephone subscriptions and exports, as well as a reciprocal relationship between fixed-telephone subscriptions and imports. The results reveal the bidirectional value of the number of fixed telephone subscriptions as a measure of digital connectivity.
Fostering Green Transition in Central and Eastern Europe: Carbon Dioxide Emissions, Industrialization, Financial Development, and Electricity Nexus
(Vilnius Gediminas Technical University, Lithuania, 2024) Mitić, Petar; Fedajev, Aleksandra; Radulescu, Magdalena; Hudea, Oana Simona; Streimikiene, Dalia
Climate change presents a substantial impediment for the global community and prompts policymakers worldwide to prioritize environmental goals when defining national development strategies. Prioritizing these goals is particularly challenging for governments of developing economies still relying on fossil fuels, foreign capital, and industry contribution to GDP. This study examines the relationships between carbon dioxide emissions, industry value added, financial development, and electricity generation in 15 Central and Eastern European countries from 1995 to 2021. To achieve this objective, we examined stationarity and cointegration and employed a vector error correction model to investigate causalities between the variables, along with a variance decomposition analysis. Our findings suggest that the short-run unidirectional causalities exist from industry value-added to carbon dioxide emissions and from carbon dioxide emissions to financial development and electricity generation. Long-term causality exists between carbon dioxide emissions and industry value added. The findings shed light on the challenges and opportunities these countries face in transitioning to climate neutrality and meeting the decarbonization targets. Within this context, the findings underscore the significance of crafting customized strategies for these economies to navigate the complex landscape of climate change while promoting sustainable industrial, electricity and financial sector development.