Twenty-first YUCOMAT 2019 & Eleventh WRTCS 2019, Herceg Novi, September 2 - 6, 2019
• 01 Apr 2024
Petković, Branka • Stanković, Dalibor • Ognjanović, Miloš • Viktorovich Avdin, Vyacheslav • Radović, Magdalena • Manojlović, Dragan • Vranješ Đurić, Sanja
The novel carbon material modified with Co3O4 particles, prepared by calcination and mixed with single wall carbon nanotubes, was characterized and used for sensing of prominent antioxidant α- lipoic acid (LA). The new material was prepared by thermolysis of Novolac phenol-formaldehyde resin and cobalt(III) nitrate mixed with graphite powder, producing mostly glassy carbon decorated with cobalt oxide. XRD and SEM measurements were used to study composition, structure and morphology of cobalt oxi ...
XIV Conference of Chemists, Technologists and Ecologists of the Republic of Srpska Banja Luka, Bosnia and Hercegovina
(University in Banjaluka, Faculty of Technology)
• 22 Oct 2022
Jovanović, Slavica • Todorović, Dragana • Stojanović-Krasić, Marija • Kevkić, Tijana • Milojević, Nenad • Drljača, Branko
Photonic lattices represent are periodic structures, suitable for investigation of wave propagation
and localization. Within these systems, different phenomenon such as discrete difraction, lattice
solitons, Anderson localization and defects localizations can be analyzed. The lattice periodicity in
one or more dimensions leads to the zonal structure in terms of existing permitted and forbidden
zones which can allow or stop light beam propagation. Manipulation with the zonal structure can ...
Technologists and Ecologists of the Republic of Srpska Banja Luka, Bosnia and Hercegovina
(University in Banjaluka, Faculty of Technology)
• 22 Oct 2022
Todorović, Dragana • Jovanović, Slavica • Kevkić, Tijana • Stojanović Krasić, Marija • Milojević, Nenad • Drljača, Branko
Climate change is one of the most significant environmental problems and is affecting the entire
global population. Renewable sources of energy (RES) are vital to deal with this problem. Solar
energy, especially photovoltaic (PV) technologies, is one of the most promising renewable energy
sources and is, therefore, one of the fastest-growing industries in this field. Thus, this paper focuses
on the performance analyses of rooftop on-grid PV system in real climatic conditions in Niš
(Se ...
FACTA UNIVERSITATIS Series: Physics, Chemistry and Technology
(Faculty of Sciences and Mathematics, University of Niš)
• 01 Apr 2024
Radulović, Niko • Ristić, Milenko • Ristić, Novica • Dekić, Vidoslav • Dekić, Biljana • Mladenović, Marko
The genus Dianthus L. (Caryophyllaceae) comprises over 300 species of herbaceous plants that are spread over a vast area, especially in the Mediterranean region. Species of this genus, represented with 38 taxa in the Serbian flora, have attracted attention due to the very beautiful flower color combinations ranging from white to deep purple [1]. This characteristic pigmentation, among several other morphological traits, distinguishes Dianthus from other genera within the family Caryophyllaceae, ...
XXI Geometrical Seminar, Book of Abstracts
(Faculty of Mathematics, University of Belgrade, Serbia)
• 01 Apr 2024
Najdanović, Marija
Contrary to isometries as transformations that preserve distances, in-
finitesimal bending is a type of small deformation in which the arc length
is invariant with appropriate precision. The influence that given deforma-
tions have on geometric quantities is measured by variations. In this talk we
discuss the infinitesimal bending of curves and variations of their energies.
In particular, we consider spherical curves and an infinitesimal bending field
that leaves a given curve on a sphere ...
• 01 Apr 2024
Spasić, Dušica • Gulan, Ljiljana
People are mainly exposed to radon in indoor environments. Exposure to radon and its decay products is the second leading cause of lung cancer, and there is a strong synergistic effect with smoking. The most significant source of indoor radon is usually the soil around building; radon penetrates into houses directly from the soil through fractures and cracks. In some cases the source of higher radon could be household water from drilled wells or exhalation from building materials. In the Europea ...
Eight International Conference on radiation and applications in various fields of research, RAD8, Virtual Conference, Herceg Novi, Montenegro, July 20-24, 2020.
• 01 Apr 2024
Vučković, Biljana • Todorović, Nataša • Nikolov, Jovana • Gulan, Ljiljana
In the present study, the water samples were taken from public fountains in rural area
municipality of Kuršumlija, in southern part of Serbia. Sampling of water from public fountains began subsequently according to establishment role and analyzed by alpha spectrometric method using the system (RAD7 RAD H2O) (DURRANGE Co.). Values of radon concentration in water ranged from 4.4 Bq l-1 to 22.4 Bq l-1, with mean value of 13.8 Bq l-1. As can be seen, the radon concentrations in water samples from t ...
Eight International Conference on radiation and applications in various fields of research, RAD8, Virtual Conference, Herceg Novi, Montenegro, July 20-24, 2020.
• 01 Apr 2024
Gulan, Ljiljana • Spasić, Dušica • Živković Radovanović, Jelena • Drobac, Boris
In order to establish radon levels in outdoor atmosphere radon measurements were performed during the fifteen days by alpha spectrometric measuring method with detector Airthings Corentium Home. Measuring point was at 0.5 m height. Since meteorological conditions can have a significant impact on radon measurements, parameters such as temperature, humidity, precipitation, wind speed were also noted by SENCOR SWS 9700. The results of short term outdoor radon concentration were read out daily and v ...
Eight International Conference on radiation and applications in various fields of research, RAD8, Virtual Conference
• 01 Apr 2024
Gulan, Ljiljana • Forkapić, Sofija • Spasić, Dušica • Živković Radovanović, Jelena • Vučković, Biljana
Spike-like peaks in the concentration of radon gas prior to a major earthquake are attributed to release different gases (CO2, CH4, H2S, SO2, H2 suitable for the transport of radon to the earth’s surface) due to pre-seismic stress or fracturing of the rock. Passive radon technique based on charcoal canister test kit conducted in the environment of Kosovska Mitrovica in summer and autumn period showed inexplicable results. Since radon levels are sensitive to short-term fluctuations, an active tec ...
2nd International conference on Advanced Production and Procesing-ICAPP 2022, Novi Sad, Serbia
(University of Novi Sad, Faculty of Technology Novi Sad)
• 20 Oct 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Kostić, Marija • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena
The effect of different montmorillonites (KSF and K10) and their modifications (Na-KSF, Na-K10) on content of formaldehyde-FA (free and liberated) modified urea-formaldehyde (UF) composites was investigated. KSF and K10 were modified by sodium chloride (NaCl). A total of four samples were synthesized, with the designations UF/KSF, UF/Na-KSF, UF/K10, and UF/Na-K10, under the same conditions. The content of free FA was determined by the bisulfite method. The hydrolytic stability of modified UF res ...
2nd International conference on Advanced Production and Procesing-ICAPP 2022, Novi Sad, Serbia
(University of Novi Sad, Faculty of Technology Novi Sad)
• 20 Oct 2022
Petković, Branka • Kostić, Marija • Samaržija-Jovanović, Suzana • Ivanović, Aleksandra • Laban, Bojana • Veljović, Djordje • Stanković, Dalibor
Domestic high performance electrode material was prepared by thermolysis of in situ synthesized urea-formaldehyde (UF) resins modified with Fe(III) nitrate and Ti(IV) oxide in different combinations: iron salt and UF resins (SynFe/UF-TP), titan oxide and UF resins (SynTi/UF-TP) and both metal compounds together and UF resins (SynFe+Ti/UF-TP). For comparison, the thermolysis prepared materials produced by simple physical mixture of metal compounds and UF resins (Fe/UF-TP, Ti/UF-TP and Fe+Ti/UF-TP ...
10th Jubilee International conference on radiation in various fields of research, Spring edition (RAD 2022)
• 13 Jun 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Kostić, Marija • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena
The effect of γ–irradiation on hydrolytic stability of nano-silica, nano-titania, and wood flour (WF) modified urea-formaldehyde (UF) resins was investigated. Modified UF resin with wood flour (Pinus silvestris L.) as natural filler and modified UF resin with a mixture of SiO2/WF and TiO2/WF fillers were synthesized. A total of five samples were synthesized, with the designations UF/SiO2, UF/TiO2, UF/WF, UF/SiO2/WF, and UF/TiO2/WF, under the same conditions. The content of free formaldehyde (FA) ...
XI International conference of social and technological development- STED 2022, Trebinje, Republic of Srpska, B&H
(University PIM, Banja Luka, Republic of Srpska, B&H)
• 02 Jun 2022
Kostić, Marija • Samaržija-Jovanović, Suzana • Cakić, Suzana • Ristić, Ivan
Polymers are the subject of intensive research and development, not only in science but also in industry. In the last few years, many studies have been conducted on conjugated polymers, and this study of polymers has revealed their morphological characteristics and their unique electrochemical properties, which has attracted many researchers from different fields to use their versatility as a tool for technological progress. The intensive field of research is covered by the synthesis, characteri ...
1th International Conference „Conference on advances in science and technology“ COAST 2022
(Faculty of Management Herceg Novi)
• 26 May 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Kostić, Marija • Jovanović, Tijana • Marinović-Cincović, Milena
In this paper, the methods of activation of montmorillonite (MMT) K10 with the content of formaldehyde (FA) in urea-formaldehyde (UF) composites are compared. MMT K10 samples were activated in two ways: thermally(physical activation) and with sulfuric acid (chemical activation). In situ synthesis of UF composites with unmodified and activated K10 under the same conditions was performed. A total of three UF composites were synthesized: reference UF composite containing unmodified MMT UF/K10, UF c ...
Ninth international conference on radiation in various fields of research (RAD 2021)
(RAD Centre, Niš, Serbia)
• 14 Jun 2021
Marković, Gordana • Marinović-Cincović, Milena • Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Teofilović, Vesna • Marković, Marija • Pavličević, Jelena • Budinski-Simendić, Jaroslava
Effect of waste rubber particles (WTR) size on elastomers based on natural rubber and chlorosulfonated polyethylene rubber (NR/CSM= 50:50) was studied. Two types of WTR with different particle size (150–250 μm and 450–600μm) were used. The content of carbon black was constant but the content of WTR was varied from 0 to 40 phr. The compounds were prepared by two-roll mill. The crosslinked materials were obtained in hydraulic press. The irradiation of prepared composite materials was carried out u ...
Ninth international conference on radiation in various fields of research (RAD 2021)
(RAD Centre)
• 14 Jun 2021
Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Petković, Branka • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena • Teofilović, Vesna
The montmorillonite as a 2:1 smectite type clay has two tetrahedral sheets of silica sandwiching the alumina octahedral sheet. The particles of this mineral are plate-shaped with the thickness of 0.96 nm and an average diameter about 1 μm. This type of clay (K10) is using to improve the characteristics of different materials in the fields of catalysis, food additives, polymers, sorbents, etc. In this study thermally activated montmorillonite (DK10) was used because the thermal treatment alters i ...
1st International conference on Advanced Production and Procesing-ICAPP 2019
(University of Novi Sad, Faculty of Technology Novi Sad)
• 10 Oct 2019
Čanaćević, Milena • Kostić, Marija • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Marković, Gordana • Budinski-Simendić, Jaroslava
In this work the hydrolytic stability of nano-composites based on urea-formaldehyde resin (UF) and montmorillonite (K10) as formaldehyde scavenger was investigated. K10 was activated by sulfuric acid (H2SO4) with and without mechanical mixing. The degree activation was determined using specific surface measurement (Sir's method) and the cation-exchange capacity (CEC) measurement. The hydrolytic stability of modified UF composites was determined by the mass losses estimation and via free formalde ...
Seventh international conference on radiation in various fields of research (RAD 2019)
(RAD Centre, Niš, Serbia)
• 10 Jun 2019
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Slaviša, Jovanović • Marković, Gordana • Marinović-Cincović, Milena • Budinski-Simendić, Jaroslava
The hydrolytic stability of organic-inorganic nano-composites prepared by a two-stage
polymerization of urea-formaldehyde resin (UF) filled with thermally activated montmorillonite (MMT) has been assessed before and after UV irradiation. The physical modification of MMT powder (type K10 with surface area 220 – 270 m2/g) was carried out by thermal treatment. The activated samples were designated as TA-K10 and the inactivated as NA-K10. The two types of ureaformaldehyde–MMT composites (UF/TA-K10 ...
Twenty‐first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019
(Materials Research Society of Serbia)
• 02 Sep 2019
Samaržija-Jovanović, Suzana • Petković, Branka • Jovanović, Tijana • Jovanović, Vojislav • Marković, Gordana • Marinović-Cincović, Milena • Budinski-Simendić, Jaroslava
Urea–formaldehyde (UF) resin adhesive is a polymeric condensation product of formaldehyde with urea and is considered as one of the most important wood adhesives. In spite of some advantages such as lower cost, fast curing, good performance in the panel, water solubility and being colorless, UF resin adhesives also possess a critical disadvantage: formaldehyde (FA) emission from the panels. Exposure to FA may occur by breathing contaminated indoor air, tobacco smoke, or ambient urban air. Furthe ...
Sixth international conference on radiation in various fields of research (RAD 2018)
(RAD Association)
• 18 Jun 2018
Budinski-Simendić, Jaroslava • Marinović-Cincović, Milena • Kojić, Dejan • Marković, Gordana • Pavličević, Jelena • Aroguz, Ayse • Samaržija-Jovanović, Suzana
Synthetic rubbers have different surface structures but benefit from chlorination. In many cases their tensile strength and extensibility is lower than natural rubber and for that reason more easily mechanically damaged. Chlorination reduces the coefficient of surface friction and handling characteristics. Residual free sulfur bloom during long-term storage of elastomeric products can also be diminished. Chlorinated natural rubber (CNR) as network precursor for elastomeric materials finds applic ...
XII Conference of Chemists, Technologists and Environmentalists of Republic of Srpska
(University of Banja Luka, Faculty of Technology, Banja Luka)
• 02 Nov 2018
Jovanović, Slaviša • Jovanović, Vojislav • Marković, Gordana • Marinović-Cincović, Milena • Gligorić, Miladin • Vukić, Nevena • Samaržija-Jovanović, Suzana • Budinski-Simendić, Jaroslava
The effects of pyrogeneous silica on the mechanical properties of elastomeric
materials based on natural rubber (NR), polybutadiene rubber (PB) and styrene butadiene
rubber (SBR) are reported. For sample preparations the content of
network precursor was constant (25:25:50), but the content of filler was varied (0,
40, 60, 80, 100 phr). Curing behavior was assessed using oscillating disc
rheometer. Results indicated that the minimum torque and maximum torque
increase with increasing filler ...
The 5th Serbian Congress of Geographers „Innovative approach and perspectives of the applied geography“, Abstract Book
(University of Novi Sad, Faculty of Sciences, Department of Geography, Tourism and Hotel Management, Novi Sad)
• 29 Sep 2021
Milentijević, Nikola • Bačević, Nikola • Valjarević, Aleksandar • Radaković, Milica • Pantelić, Milana
Recent climate change causes significant natural and socio-economic consequences. Global climate changes are caused by natural processes and anthropogenic factor. They represent one of the major environmental problems of the late XX and early XXI century. Changes in temperature and precipitation play a significant role of understanding climate change issues. It includes numerous extreme climatic events such as heat waves, droughts, forest fires etc. Empirical studies show an increase in the aver ...
7th International Conference CONTEMPORARY PROBLEMS OF MATHEMATICS, MECHANICS AND INFORMATICS, Book of Abstracts
(State University of Novi Pazar)
• 01 Apr 2024
Ljajko, Eugen • Najdanović, Marija • Maksimović, Miroslav • Kontrec, Nataša
In geometry teaching, visualization is an indispensable method of work. Its importance is emphasized in the study of abstract theories when the human mind is not capable enough to perceive the regularities determined by complex mathematical formulas without adequate images illustrating the problem. This is also the case with the theory of infinitesimal bending, that has recently been explored and represented with the use of computers. Use of computers, as an indispensable didactic tool for moder ...
