Aronia, as a berry fruit rich in nutrients, represents a suitable raw material for obtaining cold-pressed juices. The chemical composition of aronia indicates the presence of a large amount of polyphenolic compounds and anthocyanins, which contribute to its antioxidant and antimicrobial properties. This study describes the process of producing cold...

By Maja Milijaš, Dragoljub Cvetković

Based on Hamilton's method of solving the quadratic equation (couple equation), defined over the field of couple numbers, as he calls them, in this paper the method of solving the general Hamilton quadratic equation is reduced to solving of the matrix quadratic equation, which is defined over the field of bireal matrices, which correspond to bireal...

By Branko Sarić

This research presents the design of a recommender system for an online store. The system utilizes user behavior data and purchase history to generate personalized product suggestions. Its main components include a recommender server and client modules. The recommender server performs the core recommendation logic independently of the online store,...

By Darko Radulović, Marija Blagojević

This research presents an analysis of the application and acceptance of various standards in the field of the Internet of Things (IoT). Employing t-test statistical analysis, the study analyzes differences between groups of standards in three key categories: implementation complexity, adoption level, and citation frequency. The results show that co...

By Darko Radulović, Marija Blagojević

In the past few decades, wavelets have found an important place in many fields due to their nature and advantages compared to other algorithms. When the focus is on signal processing, wavelets can be used as an algorithm for de-noising, frequency analysis, feature analysis, etc. The spectrogram is one of the most common visual representations of th...

By Đorđe Damnjanović, Marina Milošević, Nedeljko Dučić, Dijana Stojić, Dejan Vujičić

In the modern digital age, mobile devices have become an indispensable part of everyday life. With the growing volume of data we handle daily, the speed of data loading and access becomes a crucial factor for the efficient operation of mobile applications. Large datasets are becoming increasingly common, such as, for example, the German collocation...

By Dijana Stojić, Dejan Vujičić, Đorđe Damnjanović, Marina Milošević

A significant portion of oil remains trapped in reservoirs after primary and secondary recovery, creating the need for advanced enhanced oil recovery (EOR) techniques. One of the more efficient and environmentally friendly methods is the use of industrial CO₂ in the enhanced oil recovery process (CO₂-EOR). This paper provides an overview of the mec...

By Branislava Radišić, Slavica Prvulović

Waste management is becoming an increasingly important factor in the context of climate change, particularly due to methane emissions from landfills, which have a significantly stronger warming effect than carbon dioxide. The City of Prnjavor, facing challenges related to the growth of municipal waste and limited infrastructure, represents a repres...

By Draženko Bjelić, Jasna Moravac, Tijana Đuričić, Borislav N. Malinović

Surface finishing of dental materials significantly influence their functional properties, biological compatibility, and long-term clinical performance. Given the diversity of materials used—including ceramics, metals, polymers, and bioactive composites—each material type necessitates a tailored approach to surface layer modification. T...

By Darina Dupláková, Samuel Mikuláško, Ján Duplák, Maryna Yeromina, Róbert Pyteľ

Ergonomics constitutes an integral part of engineering design, specifically in the development of technical systems where human physical and cognitive characteristics are systematically considered. Higher education in mechanical engineering requires the structured integration of ergonomic principles into curricula, not only from a theoretical persp...

By Darina Dupláková, Ján Duplák, Dejan Kojic, Enes Sukic, Anton Vorina