TY  - JOUR
AU  - Nikolić, Ivica
AU  - Milošević, Isidora
AU  - Milijić, Nenad
AU  - Jovanović, Aca
AU  - Mihajlović, Ivan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5299
AB  - Although the production of copper and its usage has been known for thousands of years, the search for the optimal process of its production is still in progress. The removal of the negative impacts of a certain technology could cost more, over a period of time, than the initial investment in the selection of the optimal technology process which would consider these effects. Hence, the selection should be supported by the innovative and modern tools, such as the applying of the multi-criteria analysis. This paper presents the implementation of the PROMETHEE/GAIA methodology for the ranking of the appropriate technological pyrometallurgical smelting process for the copper concentrate based on the eleven parameters which recognize the economic, ecological and technical aspects of the technological process. The implementation of the multi-criteria decision-making presented in this paper can be deemed as a contribution to the decision making tools, that is, to the one who makes a decision on the selection of the appropriate technological facility for smelting of the copper concentrates. The decision-makers faced with the practical need of evaluating and selecting the most appropriate technological process for pyrometallurgical copper extraction will get the greatest benefit from this multi-criteria model. The innovative contribution of this paper is also presented in the obtained model which systematically analyzes the ecological, economic and technical parameters of the copper extraction process.
PB  - Obuda University Hungary
T2  - ACTA POLYTECHNICA HUNGARICA
T1  - New Approach to Multi-Criteria Ranking of the Copper Concentrate Smelting Processes based on the PROMETHEE/GAIA Methodology
EP  - 164
IS  - 1
SP  - 143
VL  - 16
DO  - 10.12700/aph.16.1.2019.1.8
ER  - 

@article{
author = "Nikolić, Ivica and Milošević, Isidora and Milijić, Nenad and Jovanović, Aca and Mihajlović, Ivan",
year = "2019",
abstract = "Although the production of copper and its usage has been known for thousands of years, the search for the optimal process of its production is still in progress. The removal of the negative impacts of a certain technology could cost more, over a period of time, than the initial investment in the selection of the optimal technology process which would consider these effects. Hence, the selection should be supported by the innovative and modern tools, such as the applying of the multi-criteria analysis. This paper presents the implementation of the PROMETHEE/GAIA methodology for the ranking of the appropriate technological pyrometallurgical smelting process for the copper concentrate based on the eleven parameters which recognize the economic, ecological and technical aspects of the technological process. The implementation of the multi-criteria decision-making presented in this paper can be deemed as a contribution to the decision making tools, that is, to the one who makes a decision on the selection of the appropriate technological facility for smelting of the copper concentrates. The decision-makers faced with the practical need of evaluating and selecting the most appropriate technological process for pyrometallurgical copper extraction will get the greatest benefit from this multi-criteria model. The innovative contribution of this paper is also presented in the obtained model which systematically analyzes the ecological, economic and technical parameters of the copper extraction process.",
publisher = "Obuda University Hungary",
journal = "ACTA POLYTECHNICA HUNGARICA",
title = "New Approach to Multi-Criteria Ranking of the Copper Concentrate Smelting Processes based on the PROMETHEE/GAIA Methodology",
pages = "164-143",
number = "1",
volume = "16",
doi = "10.12700/aph.16.1.2019.1.8"
}

Nikolić, I., Milošević, I., Milijić, N., Jovanović, A.,& Mihajlović, I.. (2019). New Approach to Multi-Criteria Ranking of the Copper Concentrate Smelting Processes based on the PROMETHEE/GAIA Methodology. in ACTA POLYTECHNICA HUNGARICA
Obuda University Hungary., 16(1), 143-164.
https://doi.org/10.12700/aph.16.1.2019.1.8

Nikolić I, Milošević I, Milijić N, Jovanović A, Mihajlović I. New Approach to Multi-Criteria Ranking of the Copper Concentrate Smelting Processes based on the PROMETHEE/GAIA Methodology. in ACTA POLYTECHNICA HUNGARICA. 2019;16(1):143-164.
doi:10.12700/aph.16.1.2019.1.8 .

Nikolić, Ivica, Milošević, Isidora, Milijić, Nenad, Jovanović, Aca, Mihajlović, Ivan, "New Approach to Multi-Criteria Ranking of the Copper Concentrate Smelting Processes based on the PROMETHEE/GAIA Methodology" in ACTA POLYTECHNICA HUNGARICA, 16, no. 1 (2019):143-164,
https://doi.org/10.12700/aph.16.1.2019.1.8 . .

TY  - JOUR
AU  - Pezo, Lato
AU  - Pezo, Milada
AU  - Jovanović, Aca
AU  - Lončar, Biljana
AU  - Filipović, Vladimir
AU  - Nićetin, Milica
AU  - Kosanić, Nenad
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2260
AB  - Pužni transporteri imaju široku primenu u prehrambenoj industriji, građevinskim i rudarskim kompanijima, u hemijskoj, poljoprivrednoj i prerađivačkoj industriji, uglavnom za podizanje i / ili transport rasutih materijala na kratkim i srednjim rastojanjima. Uprkos njihovoj očiglednoj jednostavnosti, poboljšanje transportnih parametara je veoma zahtevan zadatak i inženjeri obično moraju da se oslanjaju na podatke dobijene empirijskim istraživanjima. U ovom radu, ispitivano je petnaest horizontalnih pužnih transportera sa konstantnim korakom pužnice, različite dužine, sa modifikovanom geometrijom. Ovi puževi su ispitivani radi mogućnosti pomoćnog mešanja tokom transporta materijala. Sva ispitivanja su rađena eksperimentalno i numerički, pomoću metode diskretnih elemenata (Discrete Element Method - DEM). Uticaji dužine puža, kao i predložene modifikacije geometrije u dizajnu pužne spirale, ipitivani su radi pomoćnog mešanja, tokom transporta granulisanog materijala kroz pužni transporter. Pomoćno mešanje (koje se koristi se za poboljšanje finalnog procesa mešanja) je postignuto tokom transporta materijala. Geometrija pužnog transportera se menja dodavanjem tri komplementarne spirale orijentisane u istom ili suprotnom smeru od pužne spirale. Čestice materijala se transportuju padaju dole sa vrha spirale do sledeće slobodne površine, i taj segment spirale je korišćen za dodatnu akciju mešanje. Prema eksperimentima i DEM analizema trajektorija čestice se povećava, sa primenjenim modifikacijama transportera, a ovakva geometrija može se koristiti za povećanje kvaliteta finalnog mešanja.
AB  - Fifteen horizontal single-pitch screw conveyors with modified geometry and the different lengths were investigated for premixing action, during the transport of materials. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM). The influences of screw length, observed geometry variations and different types of screw design, on the performances of the screw conveyor-mixer during material transport were explored. The auxiliary mixing action was achieved during the transport of the material. The geometry of the screw conveyor is changed by adding three complementary helices oriented in the same or the opposite direction from screw blades. The particles of the material being transported tumble down from the top of the helix to the next free surface, and that segment of helix was used for additional mixing action. According to DEM analysis, particle path length is increased, and the improved geometry could be determined for increasing the quality of mixing.
PB  - Nacionalno društvo za procesnu tehniku i energetiku u poljoprivredi, Novi Sad
T2  - Journal on Processing and Energy in Agriculture
T1  - Primena modela diskretnih elemenata na protok zrnastog materijala u pužnom transporteru
T1  - Application of discrete element method for the transportat of seed in screw conveyor
EP  - 32
IS  - 1
SP  - 29
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2260
ER  - 

@article{
author = "Pezo, Lato and Pezo, Milada and Jovanović, Aca and Lončar, Biljana and Filipović, Vladimir and Nićetin, Milica and Kosanić, Nenad",
year = "2016",
abstract = "Pužni transporteri imaju široku primenu u prehrambenoj industriji, građevinskim i rudarskim kompanijima, u hemijskoj, poljoprivrednoj i prerađivačkoj industriji, uglavnom za podizanje i / ili transport rasutih materijala na kratkim i srednjim rastojanjima. Uprkos njihovoj očiglednoj jednostavnosti, poboljšanje transportnih parametara je veoma zahtevan zadatak i inženjeri obično moraju da se oslanjaju na podatke dobijene empirijskim istraživanjima. U ovom radu, ispitivano je petnaest horizontalnih pužnih transportera sa konstantnim korakom pužnice, različite dužine, sa modifikovanom geometrijom. Ovi puževi su ispitivani radi mogućnosti pomoćnog mešanja tokom transporta materijala. Sva ispitivanja su rađena eksperimentalno i numerički, pomoću metode diskretnih elemenata (Discrete Element Method - DEM). Uticaji dužine puža, kao i predložene modifikacije geometrije u dizajnu pužne spirale, ipitivani su radi pomoćnog mešanja, tokom transporta granulisanog materijala kroz pužni transporter. Pomoćno mešanje (koje se koristi se za poboljšanje finalnog procesa mešanja) je postignuto tokom transporta materijala. Geometrija pužnog transportera se menja dodavanjem tri komplementarne spirale orijentisane u istom ili suprotnom smeru od pužne spirale. Čestice materijala se transportuju padaju dole sa vrha spirale do sledeće slobodne površine, i taj segment spirale je korišćen za dodatnu akciju mešanje. Prema eksperimentima i DEM analizema trajektorija čestice se povećava, sa primenjenim modifikacijama transportera, a ovakva geometrija može se koristiti za povećanje kvaliteta finalnog mešanja., Fifteen horizontal single-pitch screw conveyors with modified geometry and the different lengths were investigated for premixing action, during the transport of materials. All investigations were performed experimentally and numerically, by using Discrete Element Method (DEM). The influences of screw length, observed geometry variations and different types of screw design, on the performances of the screw conveyor-mixer during material transport were explored. The auxiliary mixing action was achieved during the transport of the material. The geometry of the screw conveyor is changed by adding three complementary helices oriented in the same or the opposite direction from screw blades. The particles of the material being transported tumble down from the top of the helix to the next free surface, and that segment of helix was used for additional mixing action. According to DEM analysis, particle path length is increased, and the improved geometry could be determined for increasing the quality of mixing.",
publisher = "Nacionalno društvo za procesnu tehniku i energetiku u poljoprivredi, Novi Sad",
journal = "Journal on Processing and Energy in Agriculture",
title = "Primena modela diskretnih elemenata na protok zrnastog materijala u pužnom transporteru, Application of discrete element method for the transportat of seed in screw conveyor",
pages = "32-29",
number = "1",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2260"
}

Pezo, L., Pezo, M., Jovanović, A., Lončar, B., Filipović, V., Nićetin, M.,& Kosanić, N.. (2016). Primena modela diskretnih elemenata na protok zrnastog materijala u pužnom transporteru. in Journal on Processing and Energy in Agriculture
Nacionalno društvo za procesnu tehniku i energetiku u poljoprivredi, Novi Sad., 20(1), 29-32.
https://hdl.handle.net/21.15107/rcub_machinery_2260

Pezo L, Pezo M, Jovanović A, Lončar B, Filipović V, Nićetin M, Kosanić N. Primena modela diskretnih elemenata na protok zrnastog materijala u pužnom transporteru. in Journal on Processing and Energy in Agriculture. 2016;20(1):29-32.
https://hdl.handle.net/21.15107/rcub_machinery_2260 .

Pezo, Lato, Pezo, Milada, Jovanović, Aca, Lončar, Biljana, Filipović, Vladimir, Nićetin, Milica, Kosanić, Nenad, "Primena modela diskretnih elemenata na protok zrnastog materijala u pužnom transporteru" in Journal on Processing and Energy in Agriculture, 20, no. 1 (2016):29-32,
https://hdl.handle.net/21.15107/rcub_machinery_2260 .

TY  - JOUR
AU  - Pezo, Lato
AU  - Pezo, Milada
AU  - Jovanović, Aca
AU  - Kosanić, Nenad
AU  - Petrović, Aleksandar
AU  - Lević, Ljubinko
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2491
AB  - The mixing process greatly influences the mixing efficiency, as well as the quality and the price of the intermediate and/or the final product. Static mixer is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. In this article, the novel numerical approach called Discrete Element Method is used for modelling of granular flow in multiple static mixer applications (1-3 Komax or Ross mixing elements were utilized), while the Computational Fluid Dynamic Method was chosen for fluid flow modelling, using the Eulerian multiphase model. The main aim of this article is to predict the behavior of granules being gravitationally transported in different mixer configuration and to choose the best configuration of the mixer taking into account the total particle path, the number of mixing elements and the quality of the obtained mixture. The results of the numerical simulations in the static mixers were compared to experimental results, the mixing quality is examined by RSD (relative standard deviation) criterion, and the effects on the mixer type and the number of mixing elements on mixing process were studied. The effects of the mixer type and the number of mixing elements on mixing process were studied using analysis of variance (ANOVA). Mathematical modelling is used for optimization of number of Ross and Komax segments in mixer in order to gain desirable mixing results.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Granular flow in static mixers by coupled DEM/CFD approach
EP  - 546
IS  - 5
SP  - 539
VL  - 70
DO  - 10.2298/HEMIND151013060P
ER  - 

@article{
author = "Pezo, Lato and Pezo, Milada and Jovanović, Aca and Kosanić, Nenad and Petrović, Aleksandar and Lević, Ljubinko",
year = "2016",
abstract = "The mixing process greatly influences the mixing efficiency, as well as the quality and the price of the intermediate and/or the final product. Static mixer is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. In this article, the novel numerical approach called Discrete Element Method is used for modelling of granular flow in multiple static mixer applications (1-3 Komax or Ross mixing elements were utilized), while the Computational Fluid Dynamic Method was chosen for fluid flow modelling, using the Eulerian multiphase model. The main aim of this article is to predict the behavior of granules being gravitationally transported in different mixer configuration and to choose the best configuration of the mixer taking into account the total particle path, the number of mixing elements and the quality of the obtained mixture. The results of the numerical simulations in the static mixers were compared to experimental results, the mixing quality is examined by RSD (relative standard deviation) criterion, and the effects on the mixer type and the number of mixing elements on mixing process were studied. The effects of the mixer type and the number of mixing elements on mixing process were studied using analysis of variance (ANOVA). Mathematical modelling is used for optimization of number of Ross and Komax segments in mixer in order to gain desirable mixing results.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Granular flow in static mixers by coupled DEM/CFD approach",
pages = "546-539",
number = "5",
volume = "70",
doi = "10.2298/HEMIND151013060P"
}

Pezo, L., Pezo, M., Jovanović, A., Kosanić, N., Petrović, A.,& Lević, L.. (2016). Granular flow in static mixers by coupled DEM/CFD approach. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 70(5), 539-546.
https://doi.org/10.2298/HEMIND151013060P

Pezo L, Pezo M, Jovanović A, Kosanić N, Petrović A, Lević L. Granular flow in static mixers by coupled DEM/CFD approach. in Hemijska Industrija. 2016;70(5):539-546.
doi:10.2298/HEMIND151013060P .

Pezo, Lato, Pezo, Milada, Jovanović, Aca, Kosanić, Nenad, Petrović, Aleksandar, Lević, Ljubinko, "Granular flow in static mixers by coupled DEM/CFD approach" in Hemijska Industrija, 70, no. 5 (2016):539-546,
https://doi.org/10.2298/HEMIND151013060P . .

TY  - JOUR
AU  - Jovanović, Aca
AU  - Pezo, Lato
AU  - Stanojlović, Sanja
AU  - Kosanić, Nenad
AU  - Lević, Ljubinko
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2091
AB  - Pužni transporteri se veoma intenzivno koriste u industriji za proizvodnju i preradu hrane, plastike, mineralnih sirovina, u poljoprivrednoj proizvodnji kao i u prerađivačkoj industriji za podizanje i/ili transport rasutih materijala na kratkim i srednjim rastojanjima. Uprkos njihovoj očiglednoj konstrukcionoj jednostavnosti, sam čin transporta je veoma složen za razumevanje i konstruktori se često oslanjaju na iskustvene podatke pri konstruisanju i izradi. Osobine pužnih transportera su određene radnim uslovima (kao što su: brzinu rotacije vratila puža, ugao pod kojim je nagnut pužni transporter, nivo zapreminskog punjenja puža, itd.). U ovom radu je opisano nekoliko horizontalnih puževa, konstantne dužine koraka, pri čemu su geometrije pužnih spirala neznatno izmenjene radi ispitivanja procesa mešanja tokom transporta, korišćenjem metode diskretnih elemenata (Discrete Element Method - DEM). Ispitivani su uticaji geometrijskih izmena na osobine pužnog transportera, različita konstrukciona rešenja pužne spirale su međusobno poređena, kao i efekti geometrijskih izmena na mešanje u toku transporta. Tokom transporta u pužnom transporteru, čestice padaju sa vrha pužne spirale na prvu sledeću slobodnu površinu pužne spirale i taj segment putanje čestice može da bude iskorišćen za dopunsko mešanje materijala tokom transporta. Putanja čestice se drastično povećava ugradnjom tri dodatne zavojne površine usmerene u istom pravcu kao i pužna spirala (1458,2 mm u poređenju sa 397,6 mm u slučaju pužnog transportera sa jednom spiralom). Skraćivanjem dodatnih zavojnica, koje su usmerene u istom smeru kao i pužna spirala, unekoliko se smanjuje putanja čestice, na dužinu od 1728,8 mm (usled prekidanja zavojnice na sredini pužnog transportera). Putanja čestice se produžava na 1764.4 mm, kada se ugrade dodatne zavojne površine koje su usmerene u suprotnom pravcu od pravca pužne spirale. Ugradnjom tri dodatna pravolinijske letve, dobijena je najduža putanja čestice: 2061,6 mm.
AB  - Screw conveyors are used extensively in food, plastics, mineral processing, agriculture and processing industries for elevating and/or transporting bulk materials over short to medium distances. Despite their apparent simplicity in design, the transportation action is very complex for design and constructors have tended to rely heavily on empirical performance data. Screw conveyor performance is affected by its operating conditions (such as: the rotational speed of the screw, the inclination of the screw conveyor and its volumetric fill level). In this paper, horizontal, several single-pitch screw conveyors with some geometry variations in screw blade were investigated for mixing action during transport, using Discrete Element Method (DEM). The influence of geometry modifications on the performance of screw conveyor was examined, different screw designs were compared, and the effects of geometrical variations on mixing performances during transport were explored. During the transport, the particle tumbles down from the top of the helix to the next free surface and that segment of the path was used for auxiliary mixing action. The particle path is dramatically increased with the addition of three complementary helices oriented in the same direction as screw blades (1458.2 mm compared to 397.6 mm in case of single flight screw conveyor). Transport route enlarges to 1764.4 mm, when installing helices oriented in the opposite direction from screw blades. By addition of straight line blade to single flight screw conveyor, the longest particle path is being reached: 2061.6 mm.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Korišćenje metode diskretnih elemenata na modelovanje pužnih transportera-miksera
T1  - Discrete element modelling of screw conveyor-mixers
EP  - 101
IS  - 1
SP  - 95
VL  - 69
DO  - 10.2298/HEMIND130412026J
ER  - 

@article{
author = "Jovanović, Aca and Pezo, Lato and Stanojlović, Sanja and Kosanić, Nenad and Lević, Ljubinko",
year = "2015",
abstract = "Pužni transporteri se veoma intenzivno koriste u industriji za proizvodnju i preradu hrane, plastike, mineralnih sirovina, u poljoprivrednoj proizvodnji kao i u prerađivačkoj industriji za podizanje i/ili transport rasutih materijala na kratkim i srednjim rastojanjima. Uprkos njihovoj očiglednoj konstrukcionoj jednostavnosti, sam čin transporta je veoma složen za razumevanje i konstruktori se često oslanjaju na iskustvene podatke pri konstruisanju i izradi. Osobine pužnih transportera su određene radnim uslovima (kao što su: brzinu rotacije vratila puža, ugao pod kojim je nagnut pužni transporter, nivo zapreminskog punjenja puža, itd.). U ovom radu je opisano nekoliko horizontalnih puževa, konstantne dužine koraka, pri čemu su geometrije pužnih spirala neznatno izmenjene radi ispitivanja procesa mešanja tokom transporta, korišćenjem metode diskretnih elemenata (Discrete Element Method - DEM). Ispitivani su uticaji geometrijskih izmena na osobine pužnog transportera, različita konstrukciona rešenja pužne spirale su međusobno poređena, kao i efekti geometrijskih izmena na mešanje u toku transporta. Tokom transporta u pužnom transporteru, čestice padaju sa vrha pužne spirale na prvu sledeću slobodnu površinu pužne spirale i taj segment putanje čestice može da bude iskorišćen za dopunsko mešanje materijala tokom transporta. Putanja čestice se drastično povećava ugradnjom tri dodatne zavojne površine usmerene u istom pravcu kao i pužna spirala (1458,2 mm u poređenju sa 397,6 mm u slučaju pužnog transportera sa jednom spiralom). Skraćivanjem dodatnih zavojnica, koje su usmerene u istom smeru kao i pužna spirala, unekoliko se smanjuje putanja čestice, na dužinu od 1728,8 mm (usled prekidanja zavojnice na sredini pužnog transportera). Putanja čestice se produžava na 1764.4 mm, kada se ugrade dodatne zavojne površine koje su usmerene u suprotnom pravcu od pravca pužne spirale. Ugradnjom tri dodatna pravolinijske letve, dobijena je najduža putanja čestice: 2061,6 mm., Screw conveyors are used extensively in food, plastics, mineral processing, agriculture and processing industries for elevating and/or transporting bulk materials over short to medium distances. Despite their apparent simplicity in design, the transportation action is very complex for design and constructors have tended to rely heavily on empirical performance data. Screw conveyor performance is affected by its operating conditions (such as: the rotational speed of the screw, the inclination of the screw conveyor and its volumetric fill level). In this paper, horizontal, several single-pitch screw conveyors with some geometry variations in screw blade were investigated for mixing action during transport, using Discrete Element Method (DEM). The influence of geometry modifications on the performance of screw conveyor was examined, different screw designs were compared, and the effects of geometrical variations on mixing performances during transport were explored. During the transport, the particle tumbles down from the top of the helix to the next free surface and that segment of the path was used for auxiliary mixing action. The particle path is dramatically increased with the addition of three complementary helices oriented in the same direction as screw blades (1458.2 mm compared to 397.6 mm in case of single flight screw conveyor). Transport route enlarges to 1764.4 mm, when installing helices oriented in the opposite direction from screw blades. By addition of straight line blade to single flight screw conveyor, the longest particle path is being reached: 2061.6 mm.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Korišćenje metode diskretnih elemenata na modelovanje pužnih transportera-miksera, Discrete element modelling of screw conveyor-mixers",
pages = "101-95",
number = "1",
volume = "69",
doi = "10.2298/HEMIND130412026J"
}

Jovanović, A., Pezo, L., Stanojlović, S., Kosanić, N.,& Lević, L.. (2015). Korišćenje metode diskretnih elemenata na modelovanje pužnih transportera-miksera. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 69(1), 95-101.
https://doi.org/10.2298/HEMIND130412026J

Jovanović A, Pezo L, Stanojlović S, Kosanić N, Lević L. Korišćenje metode diskretnih elemenata na modelovanje pužnih transportera-miksera. in Hemijska Industrija. 2015;69(1):95-101.
doi:10.2298/HEMIND130412026J .

Jovanović, Aca, Pezo, Lato, Stanojlović, Sanja, Kosanić, Nenad, Lević, Ljubinko, "Korišćenje metode diskretnih elemenata na modelovanje pužnih transportera-miksera" in Hemijska Industrija, 69, no. 1 (2015):95-101,
https://doi.org/10.2298/HEMIND130412026J . .