(University of Belgrade – Technical Faculty in Bor, 2026) Nujkić, Maja; Tasić, Žaklina; Kalinović, Tanja; Medić, Dragana; Radojević, Ana; Kalinović, Jelena; Jordanović, Jelena; Đorđievski, Stefan; Apostolov, Nataša

Organic compounds, heavy metals and other pollutants reach the soil, groundwater and surface water, then enter the human body through the food chain, representing a significant environmental and health problem. To develop sustainable and efficient methods for pollutant removal, increasing attention is being paid to the application of zeolites synthesised from industrial waste. Various industrial solid wastes are rich in silicates, crystalline and amorphous silicon, as well as aluminium, making them suitable raw materials for zeolite synthesis. Among the most commonly used waste materials are fly ash from coal, red mud, lithium and steel slag, coal tailings and other by-products of the metallurgical industry. This paper presents an overview of previous researches on the synthesis of zeolites from different types of industrial waste, with particular focus on the advantages and limitations of existing preparation procedures. The application of synthesised zeolites in gas purification, wastewater treatment and soil remediation is also analysed. The results of previous researches indicate the significant potential of these materials in environmental protection and the circular economy.

(Mining and Metallurgy Institute Bor, 2026) Petrović, Aleksandra; Kalinović, Tanja; Radojević, Ana; Kalinović, Jelena; Nujkić, Maja; Jordanović, Jelena

Atmospheric microplastics (MPs) are widely distributed across diverse environments. Urban areas exhibit the highest concentrations and deposition fluxes due to emissions from traffic, industry, and other anthropogenic activities. Remote regions also contain microplastics, highlighting their long-range atmospheric transport and persistence. Fibers and fragments, mainly composed of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyamide (PA), polystyrene (PS), and tire wear particles (TWP), are the predominant forms of atmospheric MPs. Western European countries lead global scientific publication output, whereas studies in the Republic of Serbia remain scarce, highlighting the need for enhanced monitoring and research on MPs occurrences, impacts, and mitigation strategies.

(University of Belgrade - Technical Faculty in Bor, 2026) Marković, Miljan; Gorgievski, Milan; Grekulović, Vesna; Štrbac, Nada; Marković Jović, Marina; Božinović, Kristina; Zdravković, Milica

Copper ion biosorption using raw and calcined chicken eggshells as biosorbents was conducted. The change in metal removal degree over time was monitored. Biosorption experiments were carried out in batch conditions for 90 minutes, as this duration is considered sufficient to reach equilibrium between phases. The experiments were conducted at three temperatures: 25 °C, 30 °C, and 35 °C. The results showed that the Cu2+ removal degree increased with time for both raw and calcined chicken eggshells. The results also indicated that system temperature significantly affects the efficiency of the biosorption process. Copper ion biosorption onto raw eggshells was considerably faster and more efficient, with a higher copper removal degree at higher temperatures. Biosorption onto calcined eggshells was less dependent on temperature, with Cu2+ removal being slightly faster at 35 °C, but the overall efficiency remained the same at all temperatures.

(Ugovorna okružna privredna komora Pirot, 2026) Janković, Lidija; Jevtić Tomić, Adrijana; Nikolić, Ivica; Milovanović, Goran

Inovacioni kapacitet predstavlja ključni pokretač ekonomskog razvoja i konkurentnosti, što je od izuzetnog značaja za zemlje Zapadnog Balkana. U tom kontekstu, rad se fokusira na ispitivanje odnosa između finansijske podrške, ulaganja preduzeća i inovacija u zemljama Zapadnog Balkana (Srbija, Bosna i Hercegovina, Crna Gora, Albanija i Severna Makedonija) u trogodišnjem periodu 2023–2025, na bazi podataka iz izdanja Evropske tabele inovacija (European Innovation Scoreboard – EIS). Primena Pearson-ove korelacije omogućila je ispitivanje veza između finansijske podrške, ulaganja firmi i broja inovatora. Rezultati ukazuju na to da finansijska podrška i investicije preduzeća imaju značajnu ulogu u oblikovanju inovacionog kapaciteta regiona. Ovi nalazi doprinose boljem razumevanju faktora koji utiču na nacionalne inovacione sisteme i predstavljaju osnovu za dalje strateško planiranje unapređenja inovacija.

(University of Belgrade, Technical Faculty in Bor, 2026) Janković, Lidija; Panić, Marija

Online shopping has become a crucial part of today's digital marketplace, but due to concerns about product quality, payment security, privacy, delivery, and scheduling, customers often view it as risky. This paper focuses on assessing and ranking the key perceived risks in online shopping using a modified FMEA methodology. The research covers five critical dimensions: product, security, privacy, time, and delivery risks. On a sample of 94 respondents, by calculating Risk Priority Numbers (RPNs) on the basis of probability, severity, and the possibility of detection, the quantification of users' subjective attitudes was carried out. Methodological validity was confirmed by the high value of the Cronbach's alpha coefficient, while MANOVA and multiple linear regression analysis were used to examine the influence of respondents' demographic characteristics on the overall level of perceived risk. The results indicate the absence of a statistically significant influence of demographic variables, thus affirming the thesis about the universality of perceived risks within the observed sample. Online shops should use the data to identify major perceived risks and create focused initiatives to reduce them, which will increase customer satisfaction and trust.

(University of Belgrade, Technical Faculty in Bor, 2026) Janković, Lidija; Jovanović, Ivan

Failure Mode and Effects Analysis (FMEA) is a methodology for identifying, evaluating, and managing risks in systems, processes, and products, to improve reliability and reduce potential failures. The main objective of the papers is to identify, select, and analyse relevant scientific articles to map the current research landscape, publication trends, keyword usage, and authorship patterns. A structured methodology was applied, including defining keywords, collecting articles, selecting relevant studies, and conducting bibliometric analysis. Data were obtained from the Web of Science database for the period 2019–2025. From an initial set of 4,201 articles, the selection was reduced to 347 articles focused on advanced approaches to the FMEA method, using Python scripts to minimise subjectivity. Bibliometric visualisation was conducted using VOSviewer, highlighting the most productive authors, country collaboration network, and co-occurrence of keywords. The bibliometric analysis identified the most influential authors and research clusters, with cooperation networks indicating pronounced international and interdisciplinary connections among researchers.

(University of Belgrade, Technical Faculty in Bor, 2026) Janković, Lidija; Vuković, Milovan; Urošević, Snežana

Qualitative methods play a significant role in management and business research, particularly in the study of complex organisational and social phenomena. This paper aims to present and compare content analysis and thematic analysis as two important techniques of qualitative data analysis. The paper is based on a review of relevant scientific literature. The results indicate that content analysis is suitable for the systematic processing and categorisation of textual data, while thematic analysis enables deeper interpretation of meaning and experiences. It can be concluded that these methods differ in research approach, but their selection depends on the research objectives and the nature of the data.