TY  - JOUR
AU  - Čeliković, Igor T.
AU  - Pantelić, Gordana K.
AU  - Živanović, Miloš Z.
AU  - Vukanac, Ivana
AU  - Krneta-Nikolić, Jelena D.
AU  - Kandić, Aleksandar
AU  - Lončar, Boris B.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5891
AB  - The second most important source of indoor radon, after soil beneath dwelling, is building material. With the increase in environmental awareness and new energy-saving policies, residents tend to replace the existing windows with tighter windows, which leads to a decrease in air exchange rate and consequently an increase in indoor radon concentration. In case of low exchange rates, dose caused by inhalation of radon and its progeny can exceed external dose originating from the radium content in the surrounding building material. In this paper, surface exhalation rates of radon ( 222 Rn) and thoron ( 220 Rn) from typical building materials used for construction and interior decoration of houses in Serbia were investigated. Surface exhalation rate measurements were performed using the closed-chamber method, while concentrations of radon and thoron in the chamber were continuously measured using an active device, RTM1688-2, produced by SARAD® GmbH. Finally, the impact of the replacement of windows on the indoor radon concentration was estimated.
T2  - Nukleonika
T1  - Radon and thoron exhalation rate measurements from building materials used in Serbia
EP  - 114
IS  - 2
SP  - 111
VL  - 65
DO  - 10.2478/nuka-2020-0017
ER  - 

@article{
author = "Čeliković, Igor T. and Pantelić, Gordana K. and Živanović, Miloš Z. and Vukanac, Ivana and Krneta-Nikolić, Jelena D. and Kandić, Aleksandar and Lončar, Boris B.",
year = "2020",
abstract = "The second most important source of indoor radon, after soil beneath dwelling, is building material. With the increase in environmental awareness and new energy-saving policies, residents tend to replace the existing windows with tighter windows, which leads to a decrease in air exchange rate and consequently an increase in indoor radon concentration. In case of low exchange rates, dose caused by inhalation of radon and its progeny can exceed external dose originating from the radium content in the surrounding building material. In this paper, surface exhalation rates of radon ( 222 Rn) and thoron ( 220 Rn) from typical building materials used for construction and interior decoration of houses in Serbia were investigated. Surface exhalation rate measurements were performed using the closed-chamber method, while concentrations of radon and thoron in the chamber were continuously measured using an active device, RTM1688-2, produced by SARAD® GmbH. Finally, the impact of the replacement of windows on the indoor radon concentration was estimated.",
journal = "Nukleonika",
title = "Radon and thoron exhalation rate measurements from building materials used in Serbia",
pages = "114-111",
number = "2",
volume = "65",
doi = "10.2478/nuka-2020-0017"
}

Čeliković, I. T., Pantelić, G. K., Živanović, M. Z., Vukanac, I., Krneta-Nikolić, J. D., Kandić, A.,& Lončar, B. B.. (2020). Radon and thoron exhalation rate measurements from building materials used in Serbia. in Nukleonika, 65(2), 111-114.
https://doi.org/10.2478/nuka-2020-0017

Čeliković IT, Pantelić GK, Živanović MZ, Vukanac I, Krneta-Nikolić JD, Kandić A, Lončar BB. Radon and thoron exhalation rate measurements from building materials used in Serbia. in Nukleonika. 2020;65(2):111-114.
doi:10.2478/nuka-2020-0017 .

Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš Z., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Kandić, Aleksandar, Lončar, Boris B., "Radon and thoron exhalation rate measurements from building materials used in Serbia" in Nukleonika, 65, no. 2 (2020):111-114,
https://doi.org/10.2478/nuka-2020-0017 . .

TY  - JOUR
AU  - Dimović, Slavko
AU  - Nikezić, Dušan P.
AU  - Šljivić-Ivanović, Marija Z.
AU  - Jelić, Ivana V.
AU  - Stanić, Vojislav
AU  - Radenković, Mirjana
AU  - Lončar, Boris B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5893
AB  - The possibility of retaining Cs+ and Co2+ bound by immobilization processes in the cement matrix is defined as the subject of its investigation: the cement matrix formulation, the water/ cement ratio, the amount of waste, and the porosity of such a structure. Implementing the standard leaching method by Hespe the possibility of comparing different authors’ results was achieved. Diffusion and semi-empirical model were used to investigate the transport phenomenon in order to predict the leaching level for a long period of time. Leaching of Co2+ and Cs+ ions under dynamic conditions immobilized in the cement matrix dynamic conditions decreases with the increase of the sludge content, regarding porosity increase. The effects of the diffusion and surface washing are equalized, and the contribution ofthe matrix dissolution to the Cs + and Co2+ transport in the cement porous media increases, on average, for one order of magnitude. The semi-empirical model gives a better approximation for Co2+ and Cs+ leaching process for the duration ofthe experiment while both models significantly approximate leaching results in dynamic conditions. © 2019, Vinca Inst Nuclear Sci. All rights reserved.
T2  - Nuclear Technology and Radiation Protection
T1  - Leaching kinetics of Cs+ and Co2+ under dynamic conditions
EP  - 248
IS  - 3
SP  - 243
VL  - 34
DO  - 10.2298/NTRP190506028D
ER  - 

@article{
author = "Dimović, Slavko and Nikezić, Dušan P. and Šljivić-Ivanović, Marija Z. and Jelić, Ivana V. and Stanić, Vojislav and Radenković, Mirjana and Lončar, Boris B.",
year = "2019",
abstract = "The possibility of retaining Cs+ and Co2+ bound by immobilization processes in the cement matrix is defined as the subject of its investigation: the cement matrix formulation, the water/ cement ratio, the amount of waste, and the porosity of such a structure. Implementing the standard leaching method by Hespe the possibility of comparing different authors’ results was achieved. Diffusion and semi-empirical model were used to investigate the transport phenomenon in order to predict the leaching level for a long period of time. Leaching of Co2+ and Cs+ ions under dynamic conditions immobilized in the cement matrix dynamic conditions decreases with the increase of the sludge content, regarding porosity increase. The effects of the diffusion and surface washing are equalized, and the contribution ofthe matrix dissolution to the Cs + and Co2+ transport in the cement porous media increases, on average, for one order of magnitude. The semi-empirical model gives a better approximation for Co2+ and Cs+ leaching process for the duration ofthe experiment while both models significantly approximate leaching results in dynamic conditions. © 2019, Vinca Inst Nuclear Sci. All rights reserved.",
journal = "Nuclear Technology and Radiation Protection",
title = "Leaching kinetics of Cs+ and Co2+ under dynamic conditions",
pages = "248-243",
number = "3",
volume = "34",
doi = "10.2298/NTRP190506028D"
}

Dimović, S., Nikezić, D. P., Šljivić-Ivanović, M. Z., Jelić, I. V., Stanić, V., Radenković, M.,& Lončar, B. B.. (2019). Leaching kinetics of Cs+ and Co2+ under dynamic conditions. in Nuclear Technology and Radiation Protection, 34(3), 243-248.
https://doi.org/10.2298/NTRP190506028D

Dimović S, Nikezić DP, Šljivić-Ivanović MZ, Jelić IV, Stanić V, Radenković M, Lončar BB. Leaching kinetics of Cs+ and Co2+ under dynamic conditions. in Nuclear Technology and Radiation Protection. 2019;34(3):243-248.
doi:10.2298/NTRP190506028D .

Dimović, Slavko, Nikezić, Dušan P., Šljivić-Ivanović, Marija Z., Jelić, Ivana V., Stanić, Vojislav, Radenković, Mirjana, Lončar, Boris B., "Leaching kinetics of Cs+ and Co2+ under dynamic conditions" in Nuclear Technology and Radiation Protection, 34, no. 3 (2019):243-248,
https://doi.org/10.2298/NTRP190506028D . .

TY  - JOUR
AU  - Kovačević, Uroš
AU  - Stanković, Koviljka
AU  - Kartalović, Nenad
AU  - Lončar, Boris B.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5872
AB  - The aim of this paper is to consider and analyze design of capacitive voltage divider for measuring ultrafast voltage occurrence. Measuring pulse voltages by means of a capacitive divider in nanosecond range is affected by problems related to the construction of the divider and materials used. However, an appropriate constructive solution could minimize the budget of measuring uncertainty of the measurement pertaining to parasitic inductivity and capacitance. Consequently, the right selection of dielectric materials could offset the effects of high-voltage and low-voltage frequency characteristics of the capacitor. Four types of capacitive dividers have been constructed for the purpose of this paper. The high-voltage capacitor of each divider is a gas capacitor (intended to avoid both electrostatic and electrodynamic influence on measurement uncertainty). Ultrafast pulse response is measured by dividers constructed in this way, and compared with the corresponding response obtained from numerical simulations.
PB  - Elsevier Sci Ltd, Oxford
T2  - International Journal of Electrical Power & Energy Systems
T1  - Design of capacitive voltage divider for measuring ultrafast voltages
EP  - 433
SP  - 426
VL  - 99
DO  - 10.1016/j.ijepes.2018.01.030
ER  - 

@article{
author = "Kovačević, Uroš and Stanković, Koviljka and Kartalović, Nenad and Lončar, Boris B.",
year = "2018",
abstract = "The aim of this paper is to consider and analyze design of capacitive voltage divider for measuring ultrafast voltage occurrence. Measuring pulse voltages by means of a capacitive divider in nanosecond range is affected by problems related to the construction of the divider and materials used. However, an appropriate constructive solution could minimize the budget of measuring uncertainty of the measurement pertaining to parasitic inductivity and capacitance. Consequently, the right selection of dielectric materials could offset the effects of high-voltage and low-voltage frequency characteristics of the capacitor. Four types of capacitive dividers have been constructed for the purpose of this paper. The high-voltage capacitor of each divider is a gas capacitor (intended to avoid both electrostatic and electrodynamic influence on measurement uncertainty). Ultrafast pulse response is measured by dividers constructed in this way, and compared with the corresponding response obtained from numerical simulations.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "International Journal of Electrical Power & Energy Systems",
title = "Design of capacitive voltage divider for measuring ultrafast voltages",
pages = "433-426",
volume = "99",
doi = "10.1016/j.ijepes.2018.01.030"
}

Kovačević, U., Stanković, K., Kartalović, N.,& Lončar, B. B.. (2018). Design of capacitive voltage divider for measuring ultrafast voltages. in International Journal of Electrical Power & Energy Systems
Elsevier Sci Ltd, Oxford., 99, 426-433.
https://doi.org/10.1016/j.ijepes.2018.01.030

Kovačević U, Stanković K, Kartalović N, Lončar BB. Design of capacitive voltage divider for measuring ultrafast voltages. in International Journal of Electrical Power & Energy Systems. 2018;99:426-433.
doi:10.1016/j.ijepes.2018.01.030 .

Kovačević, Uroš, Stanković, Koviljka, Kartalović, Nenad, Lončar, Boris B., "Design of capacitive voltage divider for measuring ultrafast voltages" in International Journal of Electrical Power & Energy Systems, 99 (2018):426-433,
https://doi.org/10.1016/j.ijepes.2018.01.030 . .

TY  - JOUR
AU  - Nikezić, Dušan P.
AU  - Gršić, Zoran J.
AU  - Dramlić, Dragan M.
AU  - Dramlić, Stefan D.
AU  - Lončar, Boris B.
AU  - Dimović, Slavko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5827
AB  - The aim of the study was to estimate if dust/fly ash emitted into the atmosphere from chimneys and the ash disposal sites of the thermal power plants Nikola Tesla A and B in Obrenovac could increase the concentration of PM10 in New Belgrade. TNTA and TNTB are close to Belgrade (population of 2.5 million) and it is important to estimate the amount of the pollution emitted into the atmosphere from these sources. The pollution from chimneys is estimated from yearly amounts of discharge, while the lifting of ash/coal dust was parameterized by the model. The used model is the straight-line Gaussian plume model written in the Fortran programming language. The first estimation was done using mathematical modeling for the idealized situation with prescribed winds and stability. The second estimation was done using the observed meteorological data for the whole year of 2009. With strong winds (over 40 km/h), dust will reach Belgrade in dozens of minutes, while during moderate winds (similar to 10-30 km/h), it would take about one hour to reach it. In these cases atmosphere is close to the neutral stability class. In case of weaker winds and stable atmosphere, the increase of air dust concentration in Belgrade would start after a few hours (6-10). Regarding the other two sources of pollution, coal handling piles and ash deposit sites, during strong winds ( GT 40 km/h) and neutral stability, fly ash would reach Belgrade in several dozen of minutes. (C) 2016 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.
T2  - Process Safety and Environmental Protection
T1  - Modeling air concentration of fly ash in Belgrade, emitted from thermal power plants TNTA and TNTB
EP  - 283
SP  - 274
VL  - 106
DO  - 10.1016/j.psep.2016.06.009
ER  - 

@article{
author = "Nikezić, Dušan P. and Gršić, Zoran J. and Dramlić, Dragan M. and Dramlić, Stefan D. and Lončar, Boris B. and Dimović, Slavko",
year = "2017",
abstract = "The aim of the study was to estimate if dust/fly ash emitted into the atmosphere from chimneys and the ash disposal sites of the thermal power plants Nikola Tesla A and B in Obrenovac could increase the concentration of PM10 in New Belgrade. TNTA and TNTB are close to Belgrade (population of 2.5 million) and it is important to estimate the amount of the pollution emitted into the atmosphere from these sources. The pollution from chimneys is estimated from yearly amounts of discharge, while the lifting of ash/coal dust was parameterized by the model. The used model is the straight-line Gaussian plume model written in the Fortran programming language. The first estimation was done using mathematical modeling for the idealized situation with prescribed winds and stability. The second estimation was done using the observed meteorological data for the whole year of 2009. With strong winds (over 40 km/h), dust will reach Belgrade in dozens of minutes, while during moderate winds (similar to 10-30 km/h), it would take about one hour to reach it. In these cases atmosphere is close to the neutral stability class. In case of weaker winds and stable atmosphere, the increase of air dust concentration in Belgrade would start after a few hours (6-10). Regarding the other two sources of pollution, coal handling piles and ash deposit sites, during strong winds ( GT 40 km/h) and neutral stability, fly ash would reach Belgrade in several dozen of minutes. (C) 2016 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.",
journal = "Process Safety and Environmental Protection",
title = "Modeling air concentration of fly ash in Belgrade, emitted from thermal power plants TNTA and TNTB",
pages = "283-274",
volume = "106",
doi = "10.1016/j.psep.2016.06.009"
}

Nikezić, D. P., Gršić, Z. J., Dramlić, D. M., Dramlić, S. D., Lončar, B. B.,& Dimović, S.. (2017). Modeling air concentration of fly ash in Belgrade, emitted from thermal power plants TNTA and TNTB. in Process Safety and Environmental Protection, 106, 274-283.
https://doi.org/10.1016/j.psep.2016.06.009

Nikezić DP, Gršić ZJ, Dramlić DM, Dramlić SD, Lončar BB, Dimović S. Modeling air concentration of fly ash in Belgrade, emitted from thermal power plants TNTA and TNTB. in Process Safety and Environmental Protection. 2017;106:274-283.
doi:10.1016/j.psep.2016.06.009 .

Nikezić, Dušan P., Gršić, Zoran J., Dramlić, Dragan M., Dramlić, Stefan D., Lončar, Boris B., Dimović, Slavko, "Modeling air concentration of fly ash in Belgrade, emitted from thermal power plants TNTA and TNTB" in Process Safety and Environmental Protection, 106 (2017):274-283,
https://doi.org/10.1016/j.psep.2016.06.009 . .

TY  - CONF
AU  - Awhida, Ahmed
AU  - Ujić, Predrag
AU  - Kolarž, Predrag M.
AU  - Čeliković, Igor T.
AU  - Milinčić, Miroljub A.
AU  - Lončar, Aleksandra M.
AU  - Lončar, Boris B.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5826
AB  - With an increase in the awareness of the need to save energy, residents tend to live in dwellings with increasingly tight windows and doors, thus reducing the ventilation rate of indoor air which leads to an increased accumulation of radon indoors. Having in mind that a dose from an exposure to inhaled radon and its progenies can be higher than a dose received from radium in building materials, it is suggested that radon exhalation measurements should receive due attention. In this contribution, the authors compare results gathered using a few methods for radon exhalation measurement and discuss its merits and demerits.
PB  - RAD Association
C3  - RAD Conference Proceedings
T1  - Merits and demerits of different methods for radon exhalation measurements for building materials
EP  - 136
SP  - 132
VL  - 2
DO  - 10.21175/RadProc.2017.27
ER  - 

@conference{
author = "Awhida, Ahmed and Ujić, Predrag and Kolarž, Predrag M. and Čeliković, Igor T. and Milinčić, Miroljub A. and Lončar, Aleksandra M. and Lončar, Boris B.",
year = "2017",
abstract = "With an increase in the awareness of the need to save energy, residents tend to live in dwellings with increasingly tight windows and doors, thus reducing the ventilation rate of indoor air which leads to an increased accumulation of radon indoors. Having in mind that a dose from an exposure to inhaled radon and its progenies can be higher than a dose received from radium in building materials, it is suggested that radon exhalation measurements should receive due attention. In this contribution, the authors compare results gathered using a few methods for radon exhalation measurement and discuss its merits and demerits.",
publisher = "RAD Association",
journal = "RAD Conference Proceedings",
title = "Merits and demerits of different methods for radon exhalation measurements for building materials",
pages = "136-132",
volume = "2",
doi = "10.21175/RadProc.2017.27"
}

Awhida, A., Ujić, P., Kolarž, P. M., Čeliković, I. T., Milinčić, M. A., Lončar, A. M.,& Lončar, B. B.. (2017). Merits and demerits of different methods for radon exhalation measurements for building materials. in RAD Conference Proceedings
RAD Association., 2, 132-136.
https://doi.org/10.21175/RadProc.2017.27

Awhida A, Ujić P, Kolarž PM, Čeliković IT, Milinčić MA, Lončar AM, Lončar BB. Merits and demerits of different methods for radon exhalation measurements for building materials. in RAD Conference Proceedings. 2017;2:132-136.
doi:10.21175/RadProc.2017.27 .

Awhida, Ahmed, Ujić, Predrag, Kolarž, Predrag M., Čeliković, Igor T., Milinčić, Miroljub A., Lončar, Aleksandra M., Lončar, Boris B., "Merits and demerits of different methods for radon exhalation measurements for building materials" in RAD Conference Proceedings, 2 (2017):132-136,
https://doi.org/10.21175/RadProc.2017.27 . .