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721 results on '"JANKOVIĆ, Bojan"'

20. Theoretical Assessment of Agro-Waste for Biogas Production Based on Novel Methodology Related to Biochemical Potential.

Author

Balać, Martina, Janković, Bojan, and Manić, Nebojša

Subjects
BIOMASS energy, ENERGY consumption, ENERGY industries, RAW materials, MATERIALS analysis, BIOGAS
Abstract

Agricultural and waste biomasses present viable solutions for utilization in the energy sector, achieving sustainable and long-term transformation into energy and fuel. However, it is important to carefully evaluate the competing applications for these feedstocks, considering both short- and long-term stability. Biomass for biogas production in agriculture and waste management is used due to its availability and ease of handling. Considering everything mentioned, evaluating the most suitable raw materials for biogas production is crucial for meeting sustainability criteria and promoting biomass as an energy source. In this paper, an examination of different biomass sources as possible feedstock to produce biogas by applying a theoretical approach to the proximate and final analysis results of those materials is presented. Based on data from the raw material analysis, the theoretical biochemical methane potential (TBMP) for the considered samples was calculated. Furthermore, the mass and energy balance for the case study biogas plant was also performed. According to the obtained results, the considered feedstocks show the validity of their use for biogas production considering the fulfillment of the raw material minimum quantity, mandatory residue arrangement, and achieving higher efficiency of the energy conversion process. [ABSTRACT FROM AUTHOR]

Published
2024
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26. Thermo-Analytical Characterization of Various Biomass Feedstocks for Assessments of Light Gaseous Compounds and Solid Residues

Author

Pijovic, Milena M., Jankovic, Bojan, Stojiljkovic, Dragoslava, Radojevic, Milos B., Manic, Nebojša, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Mitrovic, Nenad, editor, Milosevic, Milos, editor, and Mladenovic, Goran, editor

Published
2020
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27. The Pyrolysis of Waste Biomass Investigated by Simultaneous TGA-DTA-MS Measurements and Kinetic Modeling with Deconvolution Functions

Author

Manic, Nebojša, Jankovic, Bojan, Dodevski, Vladimir, Stojiljkovic, Dragoslava, Jovanovic, Vladimir, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Mitrovic, Nenad, editor, Milosevic, Milos, editor, and Mladenovic, Goran, editor

Published
2020
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33. Combustion Behavior of Cellulose Ester Fibrous Bundles from Used Cigarette Filters: Kinetic Analysis Study

Author

Veljković, Filip, Dodevski, Vladimir, Marinović-Cincović, Milena, Veličković, Suzana, Janković, Bojan Ž., Veljković, Filip, Dodevski, Vladimir, Marinović-Cincović, Milena, Veličković, Suzana, and Janković, Bojan Ž.

Abstract

This study is focused on the detailed examination of the combustion properties and kinetic analysis of a cellulose acetate fibrous bundle (CAFB), separated from used cigarette filters. It was shown that the faster rate of CAFB heating allows a large amount of heat to be supplied to a combustion system in the initial stages, where the increase in heating rate has a positive response to ignition behavior. The best combustion stability of CAFB is achieved at the lowest heating rate. Through the use of different kinetic methods, it was shown that combustion takes place through two series of consecutive reaction steps and one independent single-step reaction. By optimizing the kinetic parameters within the proposed reaction models, it was found that the steps related to the generation of levoglucosenone (LGO) (by catalytic dehydration of levoglucosan (LG)) and acrolein (by breakdown of glycerol during CAFB burning—which was carried out through glycerol adsorption on a TiO2 surface in a the developed dehydration mechanism) represent rate-controlling steps, which are strongly controlled by applied heating rate. Isothermal predictions have shown that CAFB manifests very good long-term stability at 60 °C (which corresponds to storage in a sea shipping container), while at 200 °C, it shows a sudden loss in thermal stability, which is related to the physical properties of the sample.

Published
2024

34. Mechanical performance of denture acrylic resin modified with poly(4‐styrenesulfonic acid‐ co ‐maleic anhydride) sodium salt and strontium titanate

Author

Elhmali, Houda Taher, Stajčić, Ivana, Petrović, Miloš, Janković, Bojan, Simović, Bojana, Stajčić, Aleksandar, Radojević, Vesna, Elhmali, Houda Taher, Stajčić, Ivana, Petrović, Miloš, Janković, Bojan, Simović, Bojana, Stajčić, Aleksandar, and Radojević, Vesna

Abstract

Since acrylate-based materials are widely used in dentistry, their drawbacks such as low impact resistance and hardness, require continuous research in the field of materials science in order to avoid sudden fracture caused by chewing or fall. In this study, auto-polymerizing poly(methyl methacrylate) (PMMA), commonly used as denture base material, was reinforced with poly(4-styrenesulfonic acid-co-maleic anhydride) sodium salt (PSSMA) and strontium titanate (STO), with the aim of improving impact behavior and microhardness. Morphological analysis confirmed formation of phase-separated and co-continuous microscopic structures of PSSMA in PMMA, without visible agglomerates of STO nanoparticles, indicating that PSSMA-STO interaction contributed to a better distribution of nanoparticles. Fourier transformed infrared spectroscopy revealed that PSSMA and STO did not interfere in the polymerization of methyl methacrylate. This was further supported by thermal analysis, which also showed that the addition of PSSMA and STO had no significant influence on thermal degradation. On the other side, PSSMA and STO significantly enhanced mechanical performance of PMMA. The modulus of elasticity increased by up to 48.6%, total absorbed impact energy improved by up to 108.4%, and microhardness increased by up to 272.8% when PSSMA was combined with STO for reinforcing denture PMMA. These results demonstrate the significant potential of PSSMA, which could be combined with other ceramic nanoparticles for denture reinforcement in the future. Highlights: This research presents novel dental hybrid composite. Influence of strontium titanate (STO) and poly(4-styrenesulfonic acid-co-maleic anhydride) sodium salt (PSSMA) on poly(methyl methacrylate) (PMMA) was investigated. PSSMA/STO improved modulus of elasticity, microhardness and impact resistance. Sample with 5 wt% PSSMA and 1 wt% STO showed the highest improvement compared to PMMA. Presented hybrid composite could use as denture base mate

Published
2024

37. Private security preparedness for disasters caused by fire

Author

Cvetković Vladimir, Pavlović Slavica, and Janković Bojan D.

Subjects
security, factors of influence, members, private security, fires, Social pathology. Social and public welfare. Criminology, HV1-9960
Abstract

The subject of the research was the examination of the factors of influence on the preparedness of the private security for disasters caused by fire. In addition to determining the preparedness index, there are deeper insights into the interrelationships between various selected variables and the level of preparedness of members of the private security. Using the random sampling method, 300 adult members of the private security were selected, and they participated in the research. The results of the research indicate that members of private security were not sufficiently prepared to react to fires. The research results could be used as a starting point for conducting further research in this area since the improvement in training of security personnel plays an important role in disaster control and prevention, thereby producing safer and more secure work environment and society.

Published
2021
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43. The role of stewards at sports events in the Republic of Serbia

Author

Janković Bojan D.

Subjects
stewards, sports events, the republic of serbia, Law
Abstract

The traditional view that only the police are responsible for security at sports events has largely been abandoned in the sense that stewards have more important place. This is also recognized in the Serbian legislation, in the standards of the Law on Private Security (LPS), the Law on the Prevention of Violence and Misconduct at Sports Events (LPVMSE), the Law on Public Assembly, and the international regulations of sports federations. The Council of Europe Convention on an Integrated Safety, Security and Service Approach at Football Matches and Other Sports Events - No. 218. (CETS 218), together with the Recommendation REC (2015) 1, and its annexes, which supersedes all previous recommendations, resolutions and statements, has also contributed to defining the role of stewards. Recommendation has become an integral part of the Convention (CETS 218). Common to all the aforementioned regulations is that the stewarding operations can be handled by persons who have completed special training. Unlike international regulations that provide extensive training for stewards, the existing programs in Serbia envisage very few hours of training. The work of stewards would certainly be aided by the improvement of certain legal regulations governing this area. The Republic of Serbia is not yet a signatory to the Convention (CETS 218), and it is necessary for the authorities to accede to its signing and ratification in order for Serbia to adopt the newly established European standards in this field as soon as possible.

Published
2020

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