TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Živojinović, Danijela
AU  - Kreculj, Dragan
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Simonović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5419
AB  - Reverse engineering (RE) aims to design a new replacement part based on the existing part. The goal is to perform a quality reproduction of the physical part with the best possible mechanical characteristics aiming to find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D model, improving model parameters, and realizing products using additive technologies. In this paper, a review and 
implementation of the fundamental methodologies of RE were carried out on the example of a damaged protective cover with an unknown geometry and material essential for the function of a discontinued device with no technical documentation and spare parts. An optical scanning method, 3D CAD, FEA, and additive manufacturing were used to realize the reproduced part. It was shown that by utilizing RE the lifecycle of the device could be significantly extended with minimal cost.
PB  - Faculty of Mechanical Engineering, Belgrade
T2  - FME Transactions
T1  - Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts
EP  - 38
IS  - 1
SP  - 31
VL  - 51
DO  - 10.5937/fme2301031V
ER  - 

@article{
author = "Vorkapić, Miloš and Živojinović, Danijela and Kreculj, Dragan and Ivanov, Toni and Baltić, Marija and Simonović, Aleksandar",
year = "2023",
abstract = "Reverse engineering (RE) aims to design a new replacement part based on the existing part. The goal is to perform a quality reproduction of the physical part with the best possible mechanical characteristics aiming to find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D model, improving model parameters, and realizing products using additive technologies. In this paper, a review and 
implementation of the fundamental methodologies of RE were carried out on the example of a damaged protective cover with an unknown geometry and material essential for the function of a discontinued device with no technical documentation and spare parts. An optical scanning method, 3D CAD, FEA, and additive manufacturing were used to realize the reproduced part. It was shown that by utilizing RE the lifecycle of the device could be significantly extended with minimal cost.",
publisher = "Faculty of Mechanical Engineering, Belgrade",
journal = "FME Transactions",
title = "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts",
pages = "38-31",
number = "1",
volume = "51",
doi = "10.5937/fme2301031V"
}

Vorkapić, M., Živojinović, D., Kreculj, D., Ivanov, T., Baltić, M.,& Simonović, A.. (2023). Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions
Faculty of Mechanical Engineering, Belgrade., 51(1), 31-38.
https://doi.org/10.5937/fme2301031V

Vorkapić M, Živojinović D, Kreculj D, Ivanov T, Baltić M, Simonović A. Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions. 2023;51(1):31-38.
doi:10.5937/fme2301031V .

Vorkapić, Miloš, Živojinović, Danijela, Kreculj, Dragan, Ivanov, Toni, Baltić, Marija, Simonović, Aleksandar, "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts" in FME Transactions, 51, no. 1 (2023):31-38,
https://doi.org/10.5937/fme2301031V . .

TY  - JOUR
AU  - Janković, Bojan
AU  - Manić, Nebojša
AU  - Popović, Mina
AU  - Cvetković, Slobodan
AU  - Dželetović, Željko
AU  - Stojiljković, Dragoslava
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4135
AB  - This work provides insight into possibilities of maximum utilization of C3-C4 energy crops for thermo-chemical conversion (slow pyrolysis) into high value biochemicals, platform chemicals, drop-in fuels and combustible gases, using coupled kinetic and thermodynamic analyses. In order to examine the kinetics of decomposition of lignocellulosic components, model-free and model-based methods faded from thermal analysis data were used. Thermodynamic compensation was used for explicatory of entropy controlled process, where conformational changes and chemical exchange directly affect the type and distribution of obtained pyrolytic products. It was shown that external variable (i.e. the heating rate/temperature) does not change either an entire reaction mechanism (mechanistic nature of MG and AD pyrolyses) or transition state, but it changes activation enthalpy and activation entropy which lead to differences in terms of heat energy consumption, pyrolysis favorability and thus rates of generation of activated complex among feedstocks. To investigate the interplay of catalysts (present in feedstocks as minerals) and reactants, selective energy transfer (SET) model was applied. The model showed an activity of catalyst with different outputs towards two reactants, lignin part of the structure in MG and 1,8-cineole in AD. It was shown that AD is more convenient for thermal conversion than MG, regarding to lower transformation energy requirement, higher reactivity, as well as much faster accumulation of products.
PB  - Elsevier B.V.
T2  - Industrial Crops and Products
T1  - Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions
IS  - 116275
VL  - 194
DO  - doi.org/10.1016/j.indcrop.2023.116275
ER  - 

@article{
author = "Janković, Bojan and Manić, Nebojša and Popović, Mina and Cvetković, Slobodan and Dželetović, Željko and Stojiljković, Dragoslava",
year = "2023",
abstract = "This work provides insight into possibilities of maximum utilization of C3-C4 energy crops for thermo-chemical conversion (slow pyrolysis) into high value biochemicals, platform chemicals, drop-in fuels and combustible gases, using coupled kinetic and thermodynamic analyses. In order to examine the kinetics of decomposition of lignocellulosic components, model-free and model-based methods faded from thermal analysis data were used. Thermodynamic compensation was used for explicatory of entropy controlled process, where conformational changes and chemical exchange directly affect the type and distribution of obtained pyrolytic products. It was shown that external variable (i.e. the heating rate/temperature) does not change either an entire reaction mechanism (mechanistic nature of MG and AD pyrolyses) or transition state, but it changes activation enthalpy and activation entropy which lead to differences in terms of heat energy consumption, pyrolysis favorability and thus rates of generation of activated complex among feedstocks. To investigate the interplay of catalysts (present in feedstocks as minerals) and reactants, selective energy transfer (SET) model was applied. The model showed an activity of catalyst with different outputs towards two reactants, lignin part of the structure in MG and 1,8-cineole in AD. It was shown that AD is more convenient for thermal conversion than MG, regarding to lower transformation energy requirement, higher reactivity, as well as much faster accumulation of products.",
publisher = "Elsevier B.V.",
journal = "Industrial Crops and Products",
title = "Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions",
number = "116275",
volume = "194",
doi = "doi.org/10.1016/j.indcrop.2023.116275"
}

Janković, B., Manić, N., Popović, M., Cvetković, S., Dželetović, Ž.,& Stojiljković, D.. (2023). Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions. in Industrial Crops and Products
Elsevier B.V.., 194(116275).
https://doi.org/doi.org/10.1016/j.indcrop.2023.116275

Janković B, Manić N, Popović M, Cvetković S, Dželetović Ž, Stojiljković D. Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions. in Industrial Crops and Products. 2023;194(116275).
doi:doi.org/10.1016/j.indcrop.2023.116275 .

Janković, Bojan, Manić, Nebojša, Popović, Mina, Cvetković, Slobodan, Dželetović, Željko, Stojiljković, Dragoslava, "Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions" in Industrial Crops and Products, 194, no. 116275 (2023),
https://doi.org/doi.org/10.1016/j.indcrop.2023.116275 . .

TY  - GEN
AU  - Smiljanić, Milče
AU  - Vorkapić, Miloš
AU  - Cvetanović, Katarina
AU  - Milinković, Evgenija
AU  - Lazić, Žarko
AU  - Bošković, Marko V.
AU  - Svorcan, Jelena
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7072
T1  - Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7072
ER  - 

@misc{
author = "Smiljanić, Milče and Vorkapić, Miloš and Cvetanović, Katarina and Milinković, Evgenija and Lazić, Žarko and Bošković, Marko V. and Svorcan, Jelena",
year = "2023",
title = "Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7072"
}

Smiljanić, M., Vorkapić, M., Cvetanović, K., Milinković, E., Lazić, Ž., Bošković, M. V.,& Svorcan, J.. (2023). Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama. .
https://hdl.handle.net/21.15107/rcub_machinery_7072

Smiljanić M, Vorkapić M, Cvetanović K, Milinković E, Lazić Ž, Bošković MV, Svorcan J. Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7072 .

Smiljanić, Milče, Vorkapić, Miloš, Cvetanović, Katarina, Milinković, Evgenija, Lazić, Žarko, Bošković, Marko V., Svorcan, Jelena, "Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama" (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7072 .

TY  - JOUR
AU  - Anđelković, Ljubica
AU  - Šuljagić, Marija
AU  - Mirković, Miljana
AU  - Pavlović, Vera P.
AU  - Petronijević, Ivan
AU  - Stanković, Dalibor M.
AU  - Jeremić, Dejan
AU  - Uskoković, Vuk
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7060
AB  - The combination of an intense absorption of visible light and p-type semiconducting nature makes spinel cobalt oxide (Co3O4) a very attractive material for various optoelectronic applications. However, the traditional methods for its synthesis have been either time- and energy-consuming or relying on toxic chemicals. To solve this issue, a simple, facile, and eco-friendly method of synthesis was successfully developed to obtain spinel Co3O4 nanoparticles. The novel method for obtaining pure and monophasic Co3O4 reported here is based on the thermal decomposition of hexaaquacobalt(II) D-camphor10-sulfonate at 900 °C. This fast solid-state synthesis route overcomes the disadvantages of many combustion methods, most critically by avoiding the use of toxic organic solvents. The synthesized material was subjected to a detailed characterization to assess its potential for use as a nanocatalyst. The band gap measurements indicated the presence of two band gaps, one at 2.10 eV and another at 1.22 eV, confirming the purity and semiconducting properties of the sample. The electrochemical studies demonstrated a significant enhancement in the electron transfer kinetics with the addition of the synthesized Co3O4 to the carbon-paste electrode, leading to an enhanced electrocatalytic performance. These prominent functional properties, suitable for a wide range of technological applications, pave way for the implementation of the reported method for the synthesis of Co3O4 on a larger industrial scale.
PB  - Elsevier
T2  - Ceramics International
T1  - Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition
EP  - 23498
SP  - 23491
VL  - 49
DO  - 10.1016/j.ceramint.2023.04.182
ER  - 

@article{
author = "Anđelković, Ljubica and Šuljagić, Marija and Mirković, Miljana and Pavlović, Vera P. and Petronijević, Ivan and Stanković, Dalibor M. and Jeremić, Dejan and Uskoković, Vuk",
year = "2023",
abstract = "The combination of an intense absorption of visible light and p-type semiconducting nature makes spinel cobalt oxide (Co3O4) a very attractive material for various optoelectronic applications. However, the traditional methods for its synthesis have been either time- and energy-consuming or relying on toxic chemicals. To solve this issue, a simple, facile, and eco-friendly method of synthesis was successfully developed to obtain spinel Co3O4 nanoparticles. The novel method for obtaining pure and monophasic Co3O4 reported here is based on the thermal decomposition of hexaaquacobalt(II) D-camphor10-sulfonate at 900 °C. This fast solid-state synthesis route overcomes the disadvantages of many combustion methods, most critically by avoiding the use of toxic organic solvents. The synthesized material was subjected to a detailed characterization to assess its potential for use as a nanocatalyst. The band gap measurements indicated the presence of two band gaps, one at 2.10 eV and another at 1.22 eV, confirming the purity and semiconducting properties of the sample. The electrochemical studies demonstrated a significant enhancement in the electron transfer kinetics with the addition of the synthesized Co3O4 to the carbon-paste electrode, leading to an enhanced electrocatalytic performance. These prominent functional properties, suitable for a wide range of technological applications, pave way for the implementation of the reported method for the synthesis of Co3O4 on a larger industrial scale.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition",
pages = "23498-23491",
volume = "49",
doi = "10.1016/j.ceramint.2023.04.182"
}

Anđelković, L., Šuljagić, M., Mirković, M., Pavlović, V. P., Petronijević, I., Stanković, D. M., Jeremić, D.,& Uskoković, V.. (2023). Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition. in Ceramics International
Elsevier., 49, 23491-23498.
https://doi.org/10.1016/j.ceramint.2023.04.182

Anđelković L, Šuljagić M, Mirković M, Pavlović VP, Petronijević I, Stanković DM, Jeremić D, Uskoković V. Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition. in Ceramics International. 2023;49:23491-23498.
doi:10.1016/j.ceramint.2023.04.182 .

Anđelković, Ljubica, Šuljagić, Marija, Mirković, Miljana, Pavlović, Vera P., Petronijević, Ivan, Stanković, Dalibor M., Jeremić, Dejan, Uskoković, Vuk, "Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition" in Ceramics International, 49 (2023):23491-23498,
https://doi.org/10.1016/j.ceramint.2023.04.182 . .

TY  - JOUR
AU  - Đukić, Dunja
AU  - Šuljagić, Marija
AU  - Anđelković, Ljubica
AU  - Pavlović, Vera P.
AU  - Bučevac, Dušan
AU  - Vrbica, Boško
AU  - Mirković, Miljana
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4064
AB  - The effect of Ca2+ amount and sintering temperature on mechanical properties of geopolymer-brushite (GPB) binders was investigated. Brushite and raw abandoned kaolinite clay thermally transformed into metakaolin were used for GPB synthesis. The complete phase and structural analyses were performed by X-ray powder diffraction, and Fourier transforms infrared spectroscopy (FT-IR). The pore-filling effect as a consequence of Ca2+ ions incorporation into the hybrid geopolymer networks improved the compressive strength. On the other hand, the chosen biscuit sintering at 800 and 900oC caused the phase transformation of brushite into calcium pyrophosphate, which negatively affected the compressive strength of such materials. The obtained results indicate that the usage of relatively high sintering temperatures is not always the necessary step for producing geopolymer-based types of cement with prominent mechanical properties.
PB  - ETRAN
T2  - Science of Sintering
T1  - Effect of Sintering Temperature and Calcium amount on Compressive Strength of Brushite-Metakaolin Polymer Materials
EP  - 294
IS  - 3
SP  - 287
VL  - 54
DO  - 10.2298/SOS2203287D
ER  - 

@article{
author = "Đukić, Dunja and Šuljagić, Marija and Anđelković, Ljubica and Pavlović, Vera P. and Bučevac, Dušan and Vrbica, Boško and Mirković, Miljana",
year = "2022",
abstract = "The effect of Ca2+ amount and sintering temperature on mechanical properties of geopolymer-brushite (GPB) binders was investigated. Brushite and raw abandoned kaolinite clay thermally transformed into metakaolin were used for GPB synthesis. The complete phase and structural analyses were performed by X-ray powder diffraction, and Fourier transforms infrared spectroscopy (FT-IR). The pore-filling effect as a consequence of Ca2+ ions incorporation into the hybrid geopolymer networks improved the compressive strength. On the other hand, the chosen biscuit sintering at 800 and 900oC caused the phase transformation of brushite into calcium pyrophosphate, which negatively affected the compressive strength of such materials. The obtained results indicate that the usage of relatively high sintering temperatures is not always the necessary step for producing geopolymer-based types of cement with prominent mechanical properties.",
publisher = "ETRAN",
journal = "Science of Sintering",
title = "Effect of Sintering Temperature and Calcium amount on Compressive Strength of Brushite-Metakaolin Polymer Materials",
pages = "294-287",
number = "3",
volume = "54",
doi = "10.2298/SOS2203287D"
}

Đukić, D., Šuljagić, M., Anđelković, L., Pavlović, V. P., Bučevac, D., Vrbica, B.,& Mirković, M.. (2022). Effect of Sintering Temperature and Calcium amount on Compressive Strength of Brushite-Metakaolin Polymer Materials. in Science of Sintering
ETRAN., 54(3), 287-294.
https://doi.org/10.2298/SOS2203287D

Đukić D, Šuljagić M, Anđelković L, Pavlović VP, Bučevac D, Vrbica B, Mirković M. Effect of Sintering Temperature and Calcium amount on Compressive Strength of Brushite-Metakaolin Polymer Materials. in Science of Sintering. 2022;54(3):287-294.
doi:10.2298/SOS2203287D .

Đukić, Dunja, Šuljagić, Marija, Anđelković, Ljubica, Pavlović, Vera P., Bučevac, Dušan, Vrbica, Boško, Mirković, Miljana, "Effect of Sintering Temperature and Calcium amount on Compressive Strength of Brushite-Metakaolin Polymer Materials" in Science of Sintering, 54, no. 3 (2022):287-294,
https://doi.org/10.2298/SOS2203287D . .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Živojinović, Danijela
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5428
AB  - Da bi se na 3D štampaču izradio model sa složenim dizajnom odličnog kvaliteta, treba posebnu pažnju posvetiti njegovim elementima. U radu su razmatrana tri fundamentalna elementa: glava štampača, mlaznica i radna podloga. Upravo ovi elementi su odgovorni za ispravan rad uređaja i dalju realizaciju modela. Održavanje i zadavanje parametara štampe u mnogome zavise od stanja uređaja i kvaliteta pripreme elemenata za ukupnu proceduru štampe. Ako kvalitet materijala ne odgovara mogu da se pojave problemi u realizaciji 3D modela. U radu su razmotreni i opisani pomenuti elementi. Ovim radom pokušano je da se sa aspekta kompromisa cene i kvaliteta izrade razmotri uloga vitalnih elementata 3D štampe u realizaciji modela.
PB  - Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet
C3  - Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija
T1  - Značaj komponenti 3D štampača na ukupan kvalitet izrade modela
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5428
ER  - 

@conference{
author = "Vorkapić, Miloš and Ivanov, Toni and Baltić, Marija and Živojinović, Danijela",
year = "2022",
abstract = "Da bi se na 3D štampaču izradio model sa složenim dizajnom odličnog kvaliteta, treba posebnu pažnju posvetiti njegovim elementima. U radu su razmatrana tri fundamentalna elementa: glava štampača, mlaznica i radna podloga. Upravo ovi elementi su odgovorni za ispravan rad uređaja i dalju realizaciju modela. Održavanje i zadavanje parametara štampe u mnogome zavise od stanja uređaja i kvaliteta pripreme elemenata za ukupnu proceduru štampe. Ako kvalitet materijala ne odgovara mogu da se pojave problemi u realizaciji 3D modela. U radu su razmotreni i opisani pomenuti elementi. Ovim radom pokušano je da se sa aspekta kompromisa cene i kvaliteta izrade razmotri uloga vitalnih elementata 3D štampe u realizaciji modela.",
publisher = "Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet",
journal = "Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija",
title = "Značaj komponenti 3D štampača na ukupan kvalitet izrade modela",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5428"
}

Vorkapić, M., Ivanov, T., Baltić, M.,& Živojinović, D.. (2022). Značaj komponenti 3D štampača na ukupan kvalitet izrade modela. in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija
Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet..
https://hdl.handle.net/21.15107/rcub_machinery_5428

Vorkapić M, Ivanov T, Baltić M, Živojinović D. Značaj komponenti 3D štampača na ukupan kvalitet izrade modela. in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5428 .

Vorkapić, Miloš, Ivanov, Toni, Baltić, Marija, Živojinović, Danijela, "Značaj komponenti 3D štampača na ukupan kvalitet izrade modela" in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5428 .

TY  - JOUR
AU  - Popović, Mina
AU  - Veličković, Zlate
AU  - Bogdanov, Jovica
AU  - Marinković, Aleksandar D.
AU  - Luna, Mariano Casas
AU  - Trajković, Isaak
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3740
AB  - In this study, the structure, morphology and composition of the synthesized magnetite/3D-printed wollastonite (3D_W/M) composite were characterized, and its adsorption performance with respect to As(V) and Cr(VI) were studied. Magnetite (MG) modified 3D printed wollastonite was obtained by two step procedure: modification of 3D_W with 3-aminoproylsilane (APTES) followed by controlled magnetite (MG) deposition to obtain 3D_W/M adsorbent. The structure/properties of 3D_W/M were confirmed by applying FTIR, XRD, TGD/DTA, and SEM analysis. The adsorption properties of hybrid adsorbents were carried out for As(V) and Cr(VI) removal - one relative to the initial pH value, the adsorbent mass, the temperature, and the adsorption time. Time-dependent adsorption study was best described by pseudo-second order equation, while Weber Morris analysis showed that intraparticle diffusion controled diffusional transport. Similar activation energy, 17.44 and 14.49 kJ.mol(-1) for adsorption As(V) and Cr(VI) on 3D_W/M, respectively, indicated main contribution of physical adsorption. Determination of adsorption parameters was performed by applying different adsorption isotherm models, and the best fit was obtained using Freundlich model. The adsorption capacity of 24.16 and 29.6 mg g(-1) for As(V) and Cr(VI) at 2 degrees C, Co = 5.5 and 5.3 mg L-l, respectively, were obtained. Thermodynamic study indicated favourable process at a higher temperature. Preliminary fixed-bed column study and results fitting with Bohart-Adams, Yoon-Nelson, Thomas, and Modified dose-response model showed good agreement with results from the batch study.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent
EP  - 124
IS  - 1
SP  - 105
VL  - 54
DO  - 10.2298/SOS2201105P
ER  - 

@article{
author = "Popović, Mina and Veličković, Zlate and Bogdanov, Jovica and Marinković, Aleksandar D. and Luna, Mariano Casas and Trajković, Isaak and Obradović, Nina and Pavlović, Vladimir B.",
year = "2022",
abstract = "In this study, the structure, morphology and composition of the synthesized magnetite/3D-printed wollastonite (3D_W/M) composite were characterized, and its adsorption performance with respect to As(V) and Cr(VI) were studied. Magnetite (MG) modified 3D printed wollastonite was obtained by two step procedure: modification of 3D_W with 3-aminoproylsilane (APTES) followed by controlled magnetite (MG) deposition to obtain 3D_W/M adsorbent. The structure/properties of 3D_W/M were confirmed by applying FTIR, XRD, TGD/DTA, and SEM analysis. The adsorption properties of hybrid adsorbents were carried out for As(V) and Cr(VI) removal - one relative to the initial pH value, the adsorbent mass, the temperature, and the adsorption time. Time-dependent adsorption study was best described by pseudo-second order equation, while Weber Morris analysis showed that intraparticle diffusion controled diffusional transport. Similar activation energy, 17.44 and 14.49 kJ.mol(-1) for adsorption As(V) and Cr(VI) on 3D_W/M, respectively, indicated main contribution of physical adsorption. Determination of adsorption parameters was performed by applying different adsorption isotherm models, and the best fit was obtained using Freundlich model. The adsorption capacity of 24.16 and 29.6 mg g(-1) for As(V) and Cr(VI) at 2 degrees C, Co = 5.5 and 5.3 mg L-l, respectively, were obtained. Thermodynamic study indicated favourable process at a higher temperature. Preliminary fixed-bed column study and results fitting with Bohart-Adams, Yoon-Nelson, Thomas, and Modified dose-response model showed good agreement with results from the batch study.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent",
pages = "124-105",
number = "1",
volume = "54",
doi = "10.2298/SOS2201105P"
}

Popović, M., Veličković, Z., Bogdanov, J., Marinković, A. D., Luna, M. C., Trajković, I., Obradović, N.,& Pavlović, V. B.. (2022). Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 54(1), 105-124.
https://doi.org/10.2298/SOS2201105P

Popović M, Veličković Z, Bogdanov J, Marinković AD, Luna MC, Trajković I, Obradović N, Pavlović VB. Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent. in Science of Sintering. 2022;54(1):105-124.
doi:10.2298/SOS2201105P .

Popović, Mina, Veličković, Zlate, Bogdanov, Jovica, Marinković, Aleksandar D., Luna, Mariano Casas, Trajković, Isaak, Obradović, Nina, Pavlović, Vladimir B., "Removal of the As(V) and Cr(VI) from the Water Using Magnetite/3D-Printed Wollastonite Hybrid Adsorbent" in Science of Sintering, 54, no. 1 (2022):105-124,
https://doi.org/10.2298/SOS2201105P . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
AU  - Mohammad Sakib, Hasan
AU  - Simonović, Aleksandar
AU  - Trajković, Isaak
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5423
AB  - Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.
PB  - SAGE
T2  - Advances in Mechanical Engineering
T1  - Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds
EP  - 15
IS  - 8
SP  - 1
VL  - 14
DO  - 10.1177/16878132221120737
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Ivanov, Toni and Kovačević, Aleksandar and Mohammad Sakib, Hasan and Simonović, Aleksandar and Trajković, Isaak",
year = "2022",
abstract = "Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.",
publisher = "SAGE",
journal = "Advances in Mechanical Engineering",
title = "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds",
pages = "15-1",
number = "8",
volume = "14",
doi = "10.1177/16878132221120737"
}

Vorkapić, M., Mladenović, I., Ivanov, T., Kovačević, A., Mohammad Sakib, H., Simonović, A.,& Trajković, I.. (2022). Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering
SAGE., 14(8), 1-15.
https://doi.org/10.1177/16878132221120737

Vorkapić M, Mladenović I, Ivanov T, Kovačević A, Mohammad Sakib H, Simonović A, Trajković I. Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering. 2022;14(8):1-15.
doi:10.1177/16878132221120737 .

Vorkapić, Miloš, Mladenović, Ivana, Ivanov, Toni, Kovačević, Aleksandar, Mohammad Sakib, Hasan, Simonović, Aleksandar, Trajković, Isaak, "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds" in Advances in Mechanical Engineering, 14, no. 8 (2022):1-15,
https://doi.org/10.1177/16878132221120737 . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Pergal, Marija
AU  - Ivanov, Toni
AU  - Baltić, Marija
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5421
AB  - Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.
PB  - Belgrade : Balkan Scientific Centre
T2  - Tribology and Materials
T1  - Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology
EP  - 80
IS  - 2
SP  - 70
VL  - 1
DO  - 10.46793/tribomat.2022.009
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Pergal, Marija and Ivanov, Toni and Baltić, Marija",
year = "2022",
abstract = "Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.",
publisher = "Belgrade : Balkan Scientific Centre",
journal = "Tribology and Materials",
title = "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology",
pages = "80-70",
number = "2",
volume = "1",
doi = "10.46793/tribomat.2022.009"
}

Vorkapić, M., Mladenović, I., Pergal, M., Ivanov, T.,& Baltić, M.. (2022). Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials
Belgrade : Balkan Scientific Centre., 1(2), 70-80.
https://doi.org/10.46793/tribomat.2022.009

Vorkapić M, Mladenović I, Pergal M, Ivanov T, Baltić M. Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials. 2022;1(2):70-80.
doi:10.46793/tribomat.2022.009 .

Vorkapić, Miloš, Mladenović, Ivana, Pergal, Marija, Ivanov, Toni, Baltić, Marija, "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology" in Tribology and Materials, 1, no. 2 (2022):70-80,
https://doi.org/10.46793/tribomat.2022.009 . .

TY  - CHAP
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5418
AB  - This paper investigates the implementation of additive manufacturing (AM) in circular production (CP) through the 6R strategy. The methodology allows designers to reconsider their decisions, correct mistakes or make specific changes to the model in all phases of the design process, from initial drawings to the finished product. CP enables the complete realisation of the model/prototype with a particular focus on environmental protection and the additional use of recycled waste. The proposed algorithm is tested through the design and manufacturing of an enclosure of an industrial temperature transmitter. Some of the weaknesses of additive manufacturing, such as mechanically damaged surfaces, surface roughness, and tearing of models on weak joints, have been investigated, and recommendations for mitigation are given.

The mechanical product finishing methods are described in detail in the paper as well, and in order to check the prototype functionality, some tensile, thermal stress and drop tests were performed, and the results were analysed and discussed. It was shown that significant savings in time, cost and material can be achieved by implementing AM in realising a fully functional prototype while simultaneously in line with the demands for CP and 6R.
PB  - Springer
T2  - Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems
T1  - Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter
VL  - 564
DO  - 10.1007/978-3-031-19499-3_3
ER  - 

@inbook{
author = "Vorkapić, Miloš and Ivanov, Toni",
year = "2022",
abstract = "This paper investigates the implementation of additive manufacturing (AM) in circular production (CP) through the 6R strategy. The methodology allows designers to reconsider their decisions, correct mistakes or make specific changes to the model in all phases of the design process, from initial drawings to the finished product. CP enables the complete realisation of the model/prototype with a particular focus on environmental protection and the additional use of recycled waste. The proposed algorithm is tested through the design and manufacturing of an enclosure of an industrial temperature transmitter. Some of the weaknesses of additive manufacturing, such as mechanically damaged surfaces, surface roughness, and tearing of models on weak joints, have been investigated, and recommendations for mitigation are given.

The mechanical product finishing methods are described in detail in the paper as well, and in order to check the prototype functionality, some tensile, thermal stress and drop tests were performed, and the results were analysed and discussed. It was shown that significant savings in time, cost and material can be achieved by implementing AM in realising a fully functional prototype while simultaneously in line with the demands for CP and 6R.",
publisher = "Springer",
journal = "Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems",
booktitle = "Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter",
volume = "564",
doi = "10.1007/978-3-031-19499-3_3"
}

Vorkapić, M.,& Ivanov, T.. (2022). Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter. in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems
Springer., 564.
https://doi.org/10.1007/978-3-031-19499-3_3

Vorkapić M, Ivanov T. Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter. in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems. 2022;564.
doi:10.1007/978-3-031-19499-3_3 .

Vorkapić, Miloš, Ivanov, Toni, "Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter" in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems, 564 (2022),
https://doi.org/10.1007/978-3-031-19499-3_3 . .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Mihajlović, Slavica
AU  - Vlahović, Milica
AU  - Lozanović Šajić, Jasmina
AU  - Martinović, Sanja
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3766
AB  - Sodium carbonate is a well-known material for being used as a good sorbent of carbon dioxide from the atmosphere, and as such has gained increasing importance in environmental protection. In order to enhance its sorption ability, mechanochemical activation of sodium carbonate was carried out in this study while the occurred changes after the activation and the relaxation time in a controlled environment were monitored. Activation was performed in a vibro-mill from 1 to 28 min. Based on the results of specific surface area, obtained by BET, the samples activated for 2 and 7 min were chosen and placed in a moist carbon dioxide atmosphere for 96 h, a period called the relaxation time. Differential thermal and thermogravimetric analyses were applied with the aim of determining the changes that occurred on the activated samples during the relaxation period. The decomposition temperature change of activated Na2CO3 samples, as well as mass loss and conversion level of Na2CO3 to NaHCO3 were monitored depending on activation and relaxation time periods. The conversion reactions of sodium carbonate to sodium bicarbonate under the specified environment of carbon dioxide and moisture were also studied, and the thermodynamic data such are changes in enthalpy, entropy, and Gibbs energy at the temperature range of 0-160 degrees C are given.
PB  - Elsevier, Amsterdam
T2  - Thermochimica Acta
T1  - Thermal analysis and phase changes of mechanochemically activated sodium carbonate
VL  - 708
DO  - 10.1016/j.tca.2021.179139
ER  - 

@article{
author = "Đorđević, Nataša and Mihajlović, Slavica and Vlahović, Milica and Lozanović Šajić, Jasmina and Martinović, Sanja",
year = "2022",
abstract = "Sodium carbonate is a well-known material for being used as a good sorbent of carbon dioxide from the atmosphere, and as such has gained increasing importance in environmental protection. In order to enhance its sorption ability, mechanochemical activation of sodium carbonate was carried out in this study while the occurred changes after the activation and the relaxation time in a controlled environment were monitored. Activation was performed in a vibro-mill from 1 to 28 min. Based on the results of specific surface area, obtained by BET, the samples activated for 2 and 7 min were chosen and placed in a moist carbon dioxide atmosphere for 96 h, a period called the relaxation time. Differential thermal and thermogravimetric analyses were applied with the aim of determining the changes that occurred on the activated samples during the relaxation period. The decomposition temperature change of activated Na2CO3 samples, as well as mass loss and conversion level of Na2CO3 to NaHCO3 were monitored depending on activation and relaxation time periods. The conversion reactions of sodium carbonate to sodium bicarbonate under the specified environment of carbon dioxide and moisture were also studied, and the thermodynamic data such are changes in enthalpy, entropy, and Gibbs energy at the temperature range of 0-160 degrees C are given.",
publisher = "Elsevier, Amsterdam",
journal = "Thermochimica Acta",
title = "Thermal analysis and phase changes of mechanochemically activated sodium carbonate",
volume = "708",
doi = "10.1016/j.tca.2021.179139"
}

Đorđević, N., Mihajlović, S., Vlahović, M., Lozanović Šajić, J.,& Martinović, S.. (2022). Thermal analysis and phase changes of mechanochemically activated sodium carbonate. in Thermochimica Acta
Elsevier, Amsterdam., 708.
https://doi.org/10.1016/j.tca.2021.179139

Đorđević N, Mihajlović S, Vlahović M, Lozanović Šajić J, Martinović S. Thermal analysis and phase changes of mechanochemically activated sodium carbonate. in Thermochimica Acta. 2022;708.
doi:10.1016/j.tca.2021.179139 .

Đorđević, Nataša, Mihajlović, Slavica, Vlahović, Milica, Lozanović Šajić, Jasmina, Martinović, Sanja, "Thermal analysis and phase changes of mechanochemically activated sodium carbonate" in Thermochimica Acta, 708 (2022),
https://doi.org/10.1016/j.tca.2021.179139 . .

TY  - JOUR
AU  - Marunkić, Dunja
AU  - Pejić, Jovanka
AU  - Jegdić, Bore
AU  - Linić, Suzana
AU  - Perišić, Jasmina
AU  - Radojković, Bojana
AU  - Marinković, Aleksandar
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3476
AB  - The corrosion behavior of AA7049 aluminum alloy in NaCl solution in the presence of environmentally-friendly corrosion inhibitors (Ce-chloride, Ce-formate, Ce-acetate, and Ce-propionate) was analyzed. The chemical composition of intermetallic particles was evaluated by a Scanning Electron Microscope, equipped for Energy Dispersive Spectroscopy measurements, while the presence of cerium and type of functional groups in inhibitors surface layers were analyzed by X-ray Photoelectron Spectroscopy and Fourier-Transform Infrared Spectroscopy, respectively. Inhibitor efficiencies were tested by applying electrochemical techniques such as Electrochemical Impedance Spectroscopy and Linear Sweep Voltammetry. Ce-propionate showed a greater inhibitory effect than all other tested corrosion inhibitors. The inhibitory effect decreases in the following order: Ce-propionate > Ce-acetate > Ce-formate > Ce-chloride. Propionate anions have a higher water contact angle and also a longer aliphatic side chain than acetate and formate anions. The mechanism of inhibitory action of Ce-propionate and other tested corrosion inhibitors has been proposed.
PB  - Electrochemical Soc Inc, Pennington
T2  - Journal of The Electrochemical Society
T1  - Inhibitory Effect of Cerium Salts of Lower Carboxylic Acids on Al-Zn-Mg-Cu Alloy in NaCl Solution
IS  - 8
VL  - 168
DO  - 10.1149/1945-7111/ac1895
ER  - 

@article{
author = "Marunkić, Dunja and Pejić, Jovanka and Jegdić, Bore and Linić, Suzana and Perišić, Jasmina and Radojković, Bojana and Marinković, Aleksandar",
year = "2021",
abstract = "The corrosion behavior of AA7049 aluminum alloy in NaCl solution in the presence of environmentally-friendly corrosion inhibitors (Ce-chloride, Ce-formate, Ce-acetate, and Ce-propionate) was analyzed. The chemical composition of intermetallic particles was evaluated by a Scanning Electron Microscope, equipped for Energy Dispersive Spectroscopy measurements, while the presence of cerium and type of functional groups in inhibitors surface layers were analyzed by X-ray Photoelectron Spectroscopy and Fourier-Transform Infrared Spectroscopy, respectively. Inhibitor efficiencies were tested by applying electrochemical techniques such as Electrochemical Impedance Spectroscopy and Linear Sweep Voltammetry. Ce-propionate showed a greater inhibitory effect than all other tested corrosion inhibitors. The inhibitory effect decreases in the following order: Ce-propionate > Ce-acetate > Ce-formate > Ce-chloride. Propionate anions have a higher water contact angle and also a longer aliphatic side chain than acetate and formate anions. The mechanism of inhibitory action of Ce-propionate and other tested corrosion inhibitors has been proposed.",
publisher = "Electrochemical Soc Inc, Pennington",
journal = "Journal of The Electrochemical Society",
title = "Inhibitory Effect of Cerium Salts of Lower Carboxylic Acids on Al-Zn-Mg-Cu Alloy in NaCl Solution",
number = "8",
volume = "168",
doi = "10.1149/1945-7111/ac1895"
}

Marunkić, D., Pejić, J., Jegdić, B., Linić, S., Perišić, J., Radojković, B.,& Marinković, A.. (2021). Inhibitory Effect of Cerium Salts of Lower Carboxylic Acids on Al-Zn-Mg-Cu Alloy in NaCl Solution. in Journal of The Electrochemical Society
Electrochemical Soc Inc, Pennington., 168(8).
https://doi.org/10.1149/1945-7111/ac1895

Marunkić D, Pejić J, Jegdić B, Linić S, Perišić J, Radojković B, Marinković A. Inhibitory Effect of Cerium Salts of Lower Carboxylic Acids on Al-Zn-Mg-Cu Alloy in NaCl Solution. in Journal of The Electrochemical Society. 2021;168(8).
doi:10.1149/1945-7111/ac1895 .

Marunkić, Dunja, Pejić, Jovanka, Jegdić, Bore, Linić, Suzana, Perišić, Jasmina, Radojković, Bojana, Marinković, Aleksandar, "Inhibitory Effect of Cerium Salts of Lower Carboxylic Acids on Al-Zn-Mg-Cu Alloy in NaCl Solution" in Journal of The Electrochemical Society, 168, no. 8 (2021),
https://doi.org/10.1149/1945-7111/ac1895 . .

TY  - CONF
AU  - Milosavljević, Anđelka
AU  - Polić, Suzana
AU  - Petronić, Sanja
AU  - Jarić, Marko
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7117
AB  - Hermeneutic and polytechnic views on the technologically shaped existence of modern man
intersect in the polytechnic museum environment, in terms of symbolic sublimation. In this paper, the
subject of research are operational and technical aspects of the presentation of conceptual positions
in the creation of museum representations of polytechnics, in which the central issue is the conceptual application in the visual presentation of machine parts or elements, and machines as a whole. Two studies from the Polytechnic Museum in Moscow are presented, which characterize different technological approaches in the materialization of polytechnic thinking about the technological universe of four civilization.
PB  - SMEITS
C3  - Proceedings 9th International Conference on Renewable Electrical Power Sources
T1  - Hermeneutics and visual performance of polytechnical thinking
EP  - 298
SP  - 291
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7117
ER  - 

@conference{
author = "Milosavljević, Anđelka and Polić, Suzana and Petronić, Sanja and Jarić, Marko",
year = "2021",
abstract = "Hermeneutic and polytechnic views on the technologically shaped existence of modern man
intersect in the polytechnic museum environment, in terms of symbolic sublimation. In this paper, the
subject of research are operational and technical aspects of the presentation of conceptual positions
in the creation of museum representations of polytechnics, in which the central issue is the conceptual application in the visual presentation of machine parts or elements, and machines as a whole. Two studies from the Polytechnic Museum in Moscow are presented, which characterize different technological approaches in the materialization of polytechnic thinking about the technological universe of four civilization.",
publisher = "SMEITS",
journal = "Proceedings 9th International Conference on Renewable Electrical Power Sources",
title = "Hermeneutics and visual performance of polytechnical thinking",
pages = "298-291",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7117"
}

Milosavljević, A., Polić, S., Petronić, S.,& Jarić, M.. (2021). Hermeneutics and visual performance of polytechnical thinking. in Proceedings 9th International Conference on Renewable Electrical Power Sources
SMEITS., 291-298.
https://hdl.handle.net/21.15107/rcub_machinery_7117

Milosavljević A, Polić S, Petronić S, Jarić M. Hermeneutics and visual performance of polytechnical thinking. in Proceedings 9th International Conference on Renewable Electrical Power Sources. 2021;:291-298.
https://hdl.handle.net/21.15107/rcub_machinery_7117 .

Milosavljević, Anđelka, Polić, Suzana, Petronić, Sanja, Jarić, Marko, "Hermeneutics and visual performance of polytechnical thinking" in Proceedings 9th International Conference on Renewable Electrical Power Sources (2021):291-298,
https://hdl.handle.net/21.15107/rcub_machinery_7117 .

TY  - CONF
AU  - Hasan, Sakib Mohammad
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5426
AB  - In this paper, bone-shaped samples (dogbone) made of thermoplastic polymer PLA were tested according to the ASTM D638 standard. All samples were made on a WANHAO duplicator i3 plus 3D printer. PLA is the most widely used polymer mainly due to its thermoplastic workability and good mechanical properties. The mechanical characteristics of the materials were compared after the realization of the samples on the 3D printer and after the remelting process. All samples were built in horizontal orientation. Remelting process involves stacking / packing samples in a mold and pressing them with sodium chloride (NaCl) powder. Since sodium chloride (NaCl) is a poor conductor of temperature, it takes some time for the experiment to be realized in order to equalize the temperatures throughout the volume of the mold. The mold thus formed was kept at 210°C for 30-45 minutes. The purpose of salt powder molding is to get even curing without deformation on the surfaces of the parts. The samples become rougher after this treatment and it is necessary to remove excess salt from the structure as well as additional surface treatment. The remelting process proved to be very cheap, but also quite unreliable due to the slow and uneven rise in temperature in the mold. The SHIMADZU AGS-X 100 kN tensile testing machine was used to test the tensile strength of the samples. During the experiment, it was found that the samples with remelting process have a much higher tensile strength compared to the untreated samples. Remelting procedure of PLA greatly improves the mechanical properties and gives better performance to complex parts printed on a 3D printer by reducing the anisotropic characteristics of the polymer. Further research would be related to the testing of other thermoplastic materials such as ABS, PET-G etc. It would be interesting to use other materials for molding and to perform a comparative analysis of the obtained results of the new molding methods with the described method of applying salt powder.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
T1  - Improvement of mechanical characteristics of PLA by applying remelting process
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5426
ER  - 

@conference{
author = "Hasan, Sakib Mohammad and Ivanov, Toni and Vorkapić, Miloš",
year = "2021",
abstract = "In this paper, bone-shaped samples (dogbone) made of thermoplastic polymer PLA were tested according to the ASTM D638 standard. All samples were made on a WANHAO duplicator i3 plus 3D printer. PLA is the most widely used polymer mainly due to its thermoplastic workability and good mechanical properties. The mechanical characteristics of the materials were compared after the realization of the samples on the 3D printer and after the remelting process. All samples were built in horizontal orientation. Remelting process involves stacking / packing samples in a mold and pressing them with sodium chloride (NaCl) powder. Since sodium chloride (NaCl) is a poor conductor of temperature, it takes some time for the experiment to be realized in order to equalize the temperatures throughout the volume of the mold. The mold thus formed was kept at 210°C for 30-45 minutes. The purpose of salt powder molding is to get even curing without deformation on the surfaces of the parts. The samples become rougher after this treatment and it is necessary to remove excess salt from the structure as well as additional surface treatment. The remelting process proved to be very cheap, but also quite unreliable due to the slow and uneven rise in temperature in the mold. The SHIMADZU AGS-X 100 kN tensile testing machine was used to test the tensile strength of the samples. During the experiment, it was found that the samples with remelting process have a much higher tensile strength compared to the untreated samples. Remelting procedure of PLA greatly improves the mechanical properties and gives better performance to complex parts printed on a 3D printer by reducing the anisotropic characteristics of the polymer. Further research would be related to the testing of other thermoplastic materials such as ABS, PET-G etc. It would be interesting to use other materials for molding and to perform a comparative analysis of the obtained results of the new molding methods with the described method of applying salt powder.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia",
title = "Improvement of mechanical characteristics of PLA by applying remelting process",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5426"
}

Hasan, S. M., Ivanov, T.,& Vorkapić, M.. (2021). Improvement of mechanical characteristics of PLA by applying remelting process. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5426

Hasan SM, Ivanov T, Vorkapić M. Improvement of mechanical characteristics of PLA by applying remelting process. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_5426 .

Hasan, Sakib Mohammad, Ivanov, Toni, Vorkapić, Miloš, "Improvement of mechanical characteristics of PLA by applying remelting process" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5426 .

TY  - CONF
AU  - Ilić, Stefan
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Svorcan, Jelena
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5425
AB  - The application of additive technology gives a designer more freedom in designing and defining the optimal product design. Also, it is possible to make a model with different materials that have different mechanical properties in order to meet different requirements in different places inside and outside of the part. In this paper, a 3D printer Wanhao Duplicator, type i3 plus, made in the People's Republic of China, was used for the realization of the elements of a mechanical mounting system. It is a desktop 3D printer with a maximum printable area of 200 x 200 x 180 mm3, nozzle diameter of 0.1-0.4 mm, and printing speed of 10-100 mm/s (see Figure 3). For the realization of the model, the chosen material was ABS (Acrylonitrile Butadiene Styrene) in the form of a filament (diameter 1.75 mm, manufacturer Wanhao). ABS is an amorphous polymer with the following features: excellent mechanical properties, resistance to elevated temperatures, and resistance to shocks. On the Wanhao printer, the prescribed distance between the nozzle and the plate is 0.1 mm. This is the minimum thickness of a single printed layer in the xy plane. The diameter of the melted thread is 0.1 mm, which is very thin, allowing for a very dense construction of the print along the z axis. All these parameters are essential for the quality of the print. 3D printing technology enabled the custom design and fabrication of a mechanical system intended to be placed in an irradiation room, in order to hold the component whose electric characteristics are being examined. The irradiation room may contain one or more sources of ionizing radiation. Each irradiation room may have a different way of mounting the component under test. Since it is necessary to study a specific electronic component with different ionizing radiation sources (gamma and X-ray), at different dose rates, and located in different irradiation rooms, designing a custom mounting system for each irradiation room is necessary. The cost of making a mechanical mounting system using 3D printing technology is significantly lower compared to other production methods. Thus, the creation of a system for each irradiation room individually becomes more economical. Creating such a system for each irradiation room allows much easier and more accurate positioning of the component, which reduces the error in calculating the dose that the component receives during irradiation. Each mechanical system should allow the installation of printed circuit boards of different sizes, on which the tested electronic components are located. Also, the material from which the mounting system is made must not affect the component during the experiment. Materials used in 3D printing have a negligible effect on the reflection or scattering of high-energy photons because they do not contain atoms with heavy nuclei.
PB  - SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020
C3  - Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
T1  - The use of 3D printing for studying the influence of ionizing radiation on electronic components
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5425
ER  - 

@conference{
author = "Ilić, Stefan and Vorkapić, Miloš and Ivanov, Toni and Svorcan, Jelena",
year = "2021",
abstract = "The application of additive technology gives a designer more freedom in designing and defining the optimal product design. Also, it is possible to make a model with different materials that have different mechanical properties in order to meet different requirements in different places inside and outside of the part. In this paper, a 3D printer Wanhao Duplicator, type i3 plus, made in the People's Republic of China, was used for the realization of the elements of a mechanical mounting system. It is a desktop 3D printer with a maximum printable area of 200 x 200 x 180 mm3, nozzle diameter of 0.1-0.4 mm, and printing speed of 10-100 mm/s (see Figure 3). For the realization of the model, the chosen material was ABS (Acrylonitrile Butadiene Styrene) in the form of a filament (diameter 1.75 mm, manufacturer Wanhao). ABS is an amorphous polymer with the following features: excellent mechanical properties, resistance to elevated temperatures, and resistance to shocks. On the Wanhao printer, the prescribed distance between the nozzle and the plate is 0.1 mm. This is the minimum thickness of a single printed layer in the xy plane. The diameter of the melted thread is 0.1 mm, which is very thin, allowing for a very dense construction of the print along the z axis. All these parameters are essential for the quality of the print. 3D printing technology enabled the custom design and fabrication of a mechanical system intended to be placed in an irradiation room, in order to hold the component whose electric characteristics are being examined. The irradiation room may contain one or more sources of ionizing radiation. Each irradiation room may have a different way of mounting the component under test. Since it is necessary to study a specific electronic component with different ionizing radiation sources (gamma and X-ray), at different dose rates, and located in different irradiation rooms, designing a custom mounting system for each irradiation room is necessary. The cost of making a mechanical mounting system using 3D printing technology is significantly lower compared to other production methods. Thus, the creation of a system for each irradiation room individually becomes more economical. Creating such a system for each irradiation room allows much easier and more accurate positioning of the component, which reduces the error in calculating the dose that the component receives during irradiation. Each mechanical system should allow the installation of printed circuit boards of different sizes, on which the tested electronic components are located. Also, the material from which the mounting system is made must not affect the component during the experiment. Materials used in 3D printing have a negligible effect on the reflection or scattering of high-energy photons because they do not contain atoms with heavy nuclei.",
publisher = "SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020",
journal = "Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia",
title = "The use of 3D printing for studying the influence of ionizing radiation on electronic components",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5425"
}

Ilić, S., Vorkapić, M., Ivanov, T.,& Svorcan, J.. (2021). The use of 3D printing for studying the influence of ionizing radiation on electronic components. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020..
https://hdl.handle.net/21.15107/rcub_machinery_5425

Ilić S, Vorkapić M, Ivanov T, Svorcan J. The use of 3D printing for studying the influence of ionizing radiation on electronic components. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_5425 .

Ilić, Stefan, Vorkapić, Miloš, Ivanov, Toni, Svorcan, Jelena, "The use of 3D printing for studying the influence of ionizing radiation on electronic components" in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5425 .

TY  - JOUR
AU  - Jovanović, Jelena
AU  - Ćirković, Jovana
AU  - Radojković, Aleksandar
AU  - Mutavdzić, Dragosav
AU  - Tanasijević, Gordana
AU  - Joksimović, Kristina
AU  - Bakić, Gordana
AU  - Branković, Goran
AU  - Branković, Zorica
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3527
AB  - This investigation was aimed to develop films and coatings based on natural biopolymers and active components, with physicochemical and functional properties for application in antimicrobial packaging. Biopolymer films were obtained from emulsions and dispersions by casting method. Coatings were formed by the application of emulsions on existing packaging. Synthesis of emulsions and dispersions were performed by combining biopolymers (chitosan-gelatin, pectin-gelatin) with lemongrass essential oil (LEO), Zn(CH3COO)2.2H2O, or ZnO, as active components. Fourier transform infrared (FTIR) spectra of the films showed that the addition of glycerol contributed to the forming of strong hydrogen bonds between glycerol and chitosan-gelatin or pectin-gelatin composites, facilitating the process of polymer branching, which is substantial for encapsulation. Thermal analyses revealed two characteristic processes occurring at 110 degrees C (water evaporation) and within 215-235 degrees C (degradation of polysaccharide and glycerol). Major weight losses were observed at 290 degrees C (chitosan-gelatin films) and 215 degrees C (pectin-gelatin films). The chitosan-gelatin films exhibited a lower degree of solubility (31-21%), and better mechanical properties comparing with the pectin-gelatin films. The chitosan-gelatin emulsions and dispersions exhibited a higher antibacterial effect in vitro against E. coli, B. subtilis, and S. aureus. In the case of the pectin-gelatin emulsions, the impact of LEO on the antibacterial activity was evident. The effects of biopolymer coatings on the development of microorganisms on fresh raspberries (Rubus idaeus L.) were performed in vivo during eight days of raspberry storage at refrigerator temperature. The tested coatings extended the shelf life of stored raspberries from four to eight days. The synergistic effect between LEO and ZnO or Zn-Ac was observed both in vivo and in vitro.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - Chitosan and pectin-based films and coatings with active components for application in antimicrobial food packaging
VL  - 158
DO  - 10.1016/j.porgcoat.2021.106349
ER  - 

@article{
author = "Jovanović, Jelena and Ćirković, Jovana and Radojković, Aleksandar and Mutavdzić, Dragosav and Tanasijević, Gordana and Joksimović, Kristina and Bakić, Gordana and Branković, Goran and Branković, Zorica",
year = "2021",
abstract = "This investigation was aimed to develop films and coatings based on natural biopolymers and active components, with physicochemical and functional properties for application in antimicrobial packaging. Biopolymer films were obtained from emulsions and dispersions by casting method. Coatings were formed by the application of emulsions on existing packaging. Synthesis of emulsions and dispersions were performed by combining biopolymers (chitosan-gelatin, pectin-gelatin) with lemongrass essential oil (LEO), Zn(CH3COO)2.2H2O, or ZnO, as active components. Fourier transform infrared (FTIR) spectra of the films showed that the addition of glycerol contributed to the forming of strong hydrogen bonds between glycerol and chitosan-gelatin or pectin-gelatin composites, facilitating the process of polymer branching, which is substantial for encapsulation. Thermal analyses revealed two characteristic processes occurring at 110 degrees C (water evaporation) and within 215-235 degrees C (degradation of polysaccharide and glycerol). Major weight losses were observed at 290 degrees C (chitosan-gelatin films) and 215 degrees C (pectin-gelatin films). The chitosan-gelatin films exhibited a lower degree of solubility (31-21%), and better mechanical properties comparing with the pectin-gelatin films. The chitosan-gelatin emulsions and dispersions exhibited a higher antibacterial effect in vitro against E. coli, B. subtilis, and S. aureus. In the case of the pectin-gelatin emulsions, the impact of LEO on the antibacterial activity was evident. The effects of biopolymer coatings on the development of microorganisms on fresh raspberries (Rubus idaeus L.) were performed in vivo during eight days of raspberry storage at refrigerator temperature. The tested coatings extended the shelf life of stored raspberries from four to eight days. The synergistic effect between LEO and ZnO or Zn-Ac was observed both in vivo and in vitro.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "Chitosan and pectin-based films and coatings with active components for application in antimicrobial food packaging",
volume = "158",
doi = "10.1016/j.porgcoat.2021.106349"
}

Jovanović, J., Ćirković, J., Radojković, A., Mutavdzić, D., Tanasijević, G., Joksimović, K., Bakić, G., Branković, G.,& Branković, Z.. (2021). Chitosan and pectin-based films and coatings with active components for application in antimicrobial food packaging. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 158.
https://doi.org/10.1016/j.porgcoat.2021.106349

Jovanović J, Ćirković J, Radojković A, Mutavdzić D, Tanasijević G, Joksimović K, Bakić G, Branković G, Branković Z. Chitosan and pectin-based films and coatings with active components for application in antimicrobial food packaging. in Progress in Organic Coatings. 2021;158.
doi:10.1016/j.porgcoat.2021.106349 .

Jovanović, Jelena, Ćirković, Jovana, Radojković, Aleksandar, Mutavdzić, Dragosav, Tanasijević, Gordana, Joksimović, Kristina, Bakić, Gordana, Branković, Goran, Branković, Zorica, "Chitosan and pectin-based films and coatings with active components for application in antimicrobial food packaging" in Progress in Organic Coatings, 158 (2021),
https://doi.org/10.1016/j.porgcoat.2021.106349 . .

TY  - JOUR
AU  - Linić, Suzana
AU  - Linić, Mihajlo S.
AU  - Radojković, Bojana M.
AU  - Ristić, Slavica S.
AU  - Jegdić, Bore
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3560
AB  - This paper presents a study of a free convection flow around the walls of a ventilation mill of the Thermal Power Plant "Kostolac B", Kostolac, Serbia. A combined method consists of thermography and software post-processing, PATS. The PATS is specially developed for recognition of turbulence zones by the custom processing of large input data sets from thermal videos. The calculations determine maximum temperature fluctuation i.e. peak-to-peak fluctuation at every spot during the recording time. Three thermal videos of the walls were analyzed. Maximum temperature fluctuation occurred in the zones close to the obstacles, which are thus recognized as one of the main sources of turbulence. Besides, PATS has recognized fine camera oscillations and mechanical movements of a flexible material near the dozer wall. The detected zones of turbulence correspond to the previous studies and to the theory. The method shows good potential in the field of free convective flow research through the improvement of testing efficiency and cost savings. State-of-the-art thermograph cameras and updated software are recommended.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Turbulence recognition in free convective flow by thermal-video post-processing in the case of a thermal power plant mill
EP  - 2458
IS  - 4
SP  - 2447
VL  - 25
DO  - 10.2298/TSCI200907341L
ER  - 

@article{
author = "Linić, Suzana and Linić, Mihajlo S. and Radojković, Bojana M. and Ristić, Slavica S. and Jegdić, Bore",
year = "2021",
abstract = "This paper presents a study of a free convection flow around the walls of a ventilation mill of the Thermal Power Plant "Kostolac B", Kostolac, Serbia. A combined method consists of thermography and software post-processing, PATS. The PATS is specially developed for recognition of turbulence zones by the custom processing of large input data sets from thermal videos. The calculations determine maximum temperature fluctuation i.e. peak-to-peak fluctuation at every spot during the recording time. Three thermal videos of the walls were analyzed. Maximum temperature fluctuation occurred in the zones close to the obstacles, which are thus recognized as one of the main sources of turbulence. Besides, PATS has recognized fine camera oscillations and mechanical movements of a flexible material near the dozer wall. The detected zones of turbulence correspond to the previous studies and to the theory. The method shows good potential in the field of free convective flow research through the improvement of testing efficiency and cost savings. State-of-the-art thermograph cameras and updated software are recommended.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Turbulence recognition in free convective flow by thermal-video post-processing in the case of a thermal power plant mill",
pages = "2458-2447",
number = "4",
volume = "25",
doi = "10.2298/TSCI200907341L"
}

Linić, S., Linić, M. S., Radojković, B. M., Ristić, S. S.,& Jegdić, B.. (2021). Turbulence recognition in free convective flow by thermal-video post-processing in the case of a thermal power plant mill. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 25(4), 2447-2458.
https://doi.org/10.2298/TSCI200907341L

Linić S, Linić MS, Radojković BM, Ristić SS, Jegdić B. Turbulence recognition in free convective flow by thermal-video post-processing in the case of a thermal power plant mill. in Thermal Science. 2021;25(4):2447-2458.
doi:10.2298/TSCI200907341L .

Linić, Suzana, Linić, Mihajlo S., Radojković, Bojana M., Ristić, Slavica S., Jegdić, Bore, "Turbulence recognition in free convective flow by thermal-video post-processing in the case of a thermal power plant mill" in Thermal Science, 25, no. 4 (2021):2447-2458,
https://doi.org/10.2298/TSCI200907341L . .

TY  - JOUR
AU  - Raković, Dragan
AU  - Simonović, Aleksandar
AU  - Grbović, Aleksandar
AU  - Radović, Ljubica
AU  - Vorkapić, Miloš
AU  - Krstić, Branimir
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3490
AB  - This paper presents the failure analysis results of the helicopter skid landing gear. The helicopter skid landing gear fractured while the helicopter was on the ground at the airport. The aft cross tube of the landing gear assembly was found fractured into two pieces. Observation of crack propagation area at low magnification revealed numerous secondary cracks, inner surface irregularities while fracture surface indicated fatigue process. Macro-fractographic analysis of the fracture surface disclosed features that gave additional indication of fatigue. Examination of mating fracture surfaces under scanning electron microscope (SEM) detected the existence of irregularities in the material. Chemical analysis showed the aft cross tube is made of high-strength aluminum alloy. The stress analysis of skid landing gear, using the finite element method (FEM), has identified the stress-deformation condition of the helicopter landing gear with a detail insight of the stress state in the vicinity of the crack origin. The stress value, in case of maximal takeoff weight, was very high in the crack initiation zone. The results indicate the superposition of manufacturing-in, designing-in as well as operating in defects which led to total failure of the helicopter skid landing gear aft cross tube.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Fatigue fracture analysis of helicopter landing gear cross tube
VL  - 129
DO  - 10.1016/j.engfailanal.2021.105672
ER  - 

@article{
author = "Raković, Dragan and Simonović, Aleksandar and Grbović, Aleksandar and Radović, Ljubica and Vorkapić, Miloš and Krstić, Branimir",
year = "2021",
abstract = "This paper presents the failure analysis results of the helicopter skid landing gear. The helicopter skid landing gear fractured while the helicopter was on the ground at the airport. The aft cross tube of the landing gear assembly was found fractured into two pieces. Observation of crack propagation area at low magnification revealed numerous secondary cracks, inner surface irregularities while fracture surface indicated fatigue process. Macro-fractographic analysis of the fracture surface disclosed features that gave additional indication of fatigue. Examination of mating fracture surfaces under scanning electron microscope (SEM) detected the existence of irregularities in the material. Chemical analysis showed the aft cross tube is made of high-strength aluminum alloy. The stress analysis of skid landing gear, using the finite element method (FEM), has identified the stress-deformation condition of the helicopter landing gear with a detail insight of the stress state in the vicinity of the crack origin. The stress value, in case of maximal takeoff weight, was very high in the crack initiation zone. The results indicate the superposition of manufacturing-in, designing-in as well as operating in defects which led to total failure of the helicopter skid landing gear aft cross tube.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Fatigue fracture analysis of helicopter landing gear cross tube",
volume = "129",
doi = "10.1016/j.engfailanal.2021.105672"
}

Raković, D., Simonović, A., Grbović, A., Radović, L., Vorkapić, M.,& Krstić, B.. (2021). Fatigue fracture analysis of helicopter landing gear cross tube. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 129.
https://doi.org/10.1016/j.engfailanal.2021.105672

Raković D, Simonović A, Grbović A, Radović L, Vorkapić M, Krstić B. Fatigue fracture analysis of helicopter landing gear cross tube. in Engineering Failure Analysis. 2021;129.
doi:10.1016/j.engfailanal.2021.105672 .

Raković, Dragan, Simonović, Aleksandar, Grbović, Aleksandar, Radović, Ljubica, Vorkapić, Miloš, Krstić, Branimir, "Fatigue fracture analysis of helicopter landing gear cross tube" in Engineering Failure Analysis, 129 (2021),
https://doi.org/10.1016/j.engfailanal.2021.105672 . .

TY  - CHAP
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Ivanov, Toni
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3674
AB  - Additive manufacturing technology helped many organizations to save money in the product design process by reducing prototype costs, and also by providing a means for early evaluation and decision making. The idea of this paper is to design an electronics enclosure for an intelligent industrial pressure transmitter, using the additive technology. All enclosure elements are made on a 3D printer WANHAO duplicator i3 plus, using PLA materials. The enclosure realization, from CAD drawings to the finished model, enables a designer to correct existing errors, or make certain modifications as required by end-users. A process is described that enables designers to review their decisions at any stage of product realization, thus providing much more freedom in rapid prototyping. In this example, the advantages and disadvantages of additive manufacturing over conventional manufacturing are outlined. Some deficiencies have also been observed, such as mechanical damage to surfaces, burning of surfaces, tearing of prints, and surface roughness. To mitigate such irregularities, both mechanical and chemical finishing methods were used. The example confirmed that the finishing methods can affect the final enclosure dimensions and shape. Further prototype development should focus more on print quality, which depends on the shape of surfaces, the accuracy of the geometry, the uniformity of structure and shape, material density, and the resolution of details.
PB  - Springer
T2  - Lecture Notes in Networks and Systems
T1  - Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter
EP  - 129
SP  - 112
VL  - 153
DO  - 10.1007/978-3-030-58362-0_8
ER  - 

@inbook{
author = "Vorkapić, Miloš and Simonović, Aleksandar and Ivanov, Toni",
year = "2021",
abstract = "Additive manufacturing technology helped many organizations to save money in the product design process by reducing prototype costs, and also by providing a means for early evaluation and decision making. The idea of this paper is to design an electronics enclosure for an intelligent industrial pressure transmitter, using the additive technology. All enclosure elements are made on a 3D printer WANHAO duplicator i3 plus, using PLA materials. The enclosure realization, from CAD drawings to the finished model, enables a designer to correct existing errors, or make certain modifications as required by end-users. A process is described that enables designers to review their decisions at any stage of product realization, thus providing much more freedom in rapid prototyping. In this example, the advantages and disadvantages of additive manufacturing over conventional manufacturing are outlined. Some deficiencies have also been observed, such as mechanical damage to surfaces, burning of surfaces, tearing of prints, and surface roughness. To mitigate such irregularities, both mechanical and chemical finishing methods were used. The example confirmed that the finishing methods can affect the final enclosure dimensions and shape. Further prototype development should focus more on print quality, which depends on the shape of surfaces, the accuracy of the geometry, the uniformity of structure and shape, material density, and the resolution of details.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems",
booktitle = "Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter",
pages = "129-112",
volume = "153",
doi = "10.1007/978-3-030-58362-0_8"
}

Vorkapić, M., Simonović, A.,& Ivanov, T.. (2021). Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter. in Lecture Notes in Networks and Systems
Springer., 153, 112-129.
https://doi.org/10.1007/978-3-030-58362-0_8

Vorkapić M, Simonović A, Ivanov T. Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter. in Lecture Notes in Networks and Systems. 2021;153:112-129.
doi:10.1007/978-3-030-58362-0_8 .

Vorkapić, Miloš, Simonović, Aleksandar, Ivanov, Toni, "Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter" in Lecture Notes in Networks and Systems, 153 (2021):112-129,
https://doi.org/10.1007/978-3-030-58362-0_8 . .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Peković, Ognjen
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4212
AB  - With wind energy extraction constantly increasing, the interest in small-scale urban wind turbines
is also expanding. Given that these machines often work in adverse operating conditions
(Earth’s boundary layer, vortex trails of surrounding objects, small and changeable wind speeds),
additional elements that locally augment wind velocity and facilitate turbine start may be installed.
This paper investigates possible benefits of adding an optimized flow concentrator to a vertical-axis
wind turbine (VAWT) rotor. Three-dimensional, unsteady, turbulent, incompressible flow simulations
of both isolated rotor consisting of three straight blades and a rotor with flow concentrator have been performed in ANSYS FLUENT by finite volume method for several different operational regimes. This type of flow simulations is challenging since flow angles are high, numerous flow phenomena and instabilities are present and the interaction between the blades and detached vortices can be significant. The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST turbulence model used for closure. Both quantitative and qualitative examinations of the obtained numerical results are presented. In particular, the two computed power coefficient curves are compared and the advantages of installing a flow concentrator are accentuated.
PB  - Beograd : SMEITS
C3  - 8th International Conference on Renewable Electrical Power Sources
T1  - Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator
EP  - 141
SP  - 135
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4212
ER  - 

@conference{
author = "Svorcan, Jelena and Peković, Ognjen and Ivanov, Toni and Vorkapić, Miloš",
year = "2020",
abstract = "With wind energy extraction constantly increasing, the interest in small-scale urban wind turbines
is also expanding. Given that these machines often work in adverse operating conditions
(Earth’s boundary layer, vortex trails of surrounding objects, small and changeable wind speeds),
additional elements that locally augment wind velocity and facilitate turbine start may be installed.
This paper investigates possible benefits of adding an optimized flow concentrator to a vertical-axis
wind turbine (VAWT) rotor. Three-dimensional, unsteady, turbulent, incompressible flow simulations
of both isolated rotor consisting of three straight blades and a rotor with flow concentrator have been performed in ANSYS FLUENT by finite volume method for several different operational regimes. This type of flow simulations is challenging since flow angles are high, numerous flow phenomena and instabilities are present and the interaction between the blades and detached vortices can be significant. The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST turbulence model used for closure. Both quantitative and qualitative examinations of the obtained numerical results are presented. In particular, the two computed power coefficient curves are compared and the advantages of installing a flow concentrator are accentuated.",
publisher = "Beograd : SMEITS",
journal = "8th International Conference on Renewable Electrical Power Sources",
title = "Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator",
pages = "141-135",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4212"
}

Svorcan, J., Peković, O., Ivanov, T.,& Vorkapić, M.. (2020). Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator. in 8th International Conference on Renewable Electrical Power Sources
Beograd : SMEITS., 135-141.
https://hdl.handle.net/21.15107/rcub_machinery_4212

Svorcan J, Peković O, Ivanov T, Vorkapić M. Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator. in 8th International Conference on Renewable Electrical Power Sources. 2020;:135-141.
https://hdl.handle.net/21.15107/rcub_machinery_4212 .

Svorcan, Jelena, Peković, Ognjen, Ivanov, Toni, Vorkapić, Miloš, "Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator" in 8th International Conference on Renewable Electrical Power Sources (2020):135-141,
https://hdl.handle.net/21.15107/rcub_machinery_4212 .

TY  - JOUR
AU  - Hasan, Mohammad Sakib
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Daou, David
AU  - Kovacević, Aleksandar
AU  - Milovanović, Aleksa
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3371
AB  - Rapid innovations in 3D printing technology have allowed highly complex parts to be manufactured quickly and easily, particularly for prototyping purposes. Fused Deposition Modeling of thermoplastic materials is one of the most commonly used techniques in three-dimensional (3D) printing. The major aim of Fused Deposition Modeling (FDM) is to design and manufacture usable parts for fields such as engineering and medicine. Therefore, it is essential to investigate the mechanical properties of such FDM processed structures. One of the most commonly used materials currently on the market is Polylactic Acid (PLA). The main purpose of this paper is to investigate the effects of aging and heat treatment on the tensile properties of PLA printed test specimens. The tensile properties of parts manufactured by the 3D printer are influenced by various parameters such as extrusion temperature, infill density, building direction, layer height, etc. A total of 96 specimens were built by altering building orientation and layer height to estimate and compare the tensile properties of the printed parts. To investigate the aging effect, 30 of 96 specimens were printed 6 months before the tensile experiment. Half of both aged and new specimens were cured in an oven at 57.5 [degrees C] for 3 hours while the other half endured no heat treatment. After the performed measurement, it can be concluded that heat treatment generally improves structural strength of the printed parts, while aging decreases it. However, these effects are highly dependent on the layer thickness and printing quality. The tensile test is conducted according to the ASTM D638 standard. The fractured samples were further characterized using an electron microscope.
PB  - Revista Chimie Srl, Bucuresti
T2  - Materiale Plastice
T1  - Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts
EP  - 159
IS  - 3
SP  - 147
VL  - 57
DO  - 10.37358/MP.20.3.5389
ER  - 

@article{
author = "Hasan, Mohammad Sakib and Ivanov, Toni and Vorkapić, Miloš and Simonović, Aleksandar and Daou, David and Kovacević, Aleksandar and Milovanović, Aleksa",
year = "2020",
abstract = "Rapid innovations in 3D printing technology have allowed highly complex parts to be manufactured quickly and easily, particularly for prototyping purposes. Fused Deposition Modeling of thermoplastic materials is one of the most commonly used techniques in three-dimensional (3D) printing. The major aim of Fused Deposition Modeling (FDM) is to design and manufacture usable parts for fields such as engineering and medicine. Therefore, it is essential to investigate the mechanical properties of such FDM processed structures. One of the most commonly used materials currently on the market is Polylactic Acid (PLA). The main purpose of this paper is to investigate the effects of aging and heat treatment on the tensile properties of PLA printed test specimens. The tensile properties of parts manufactured by the 3D printer are influenced by various parameters such as extrusion temperature, infill density, building direction, layer height, etc. A total of 96 specimens were built by altering building orientation and layer height to estimate and compare the tensile properties of the printed parts. To investigate the aging effect, 30 of 96 specimens were printed 6 months before the tensile experiment. Half of both aged and new specimens were cured in an oven at 57.5 [degrees C] for 3 hours while the other half endured no heat treatment. After the performed measurement, it can be concluded that heat treatment generally improves structural strength of the printed parts, while aging decreases it. However, these effects are highly dependent on the layer thickness and printing quality. The tensile test is conducted according to the ASTM D638 standard. The fractured samples were further characterized using an electron microscope.",
publisher = "Revista Chimie Srl, Bucuresti",
journal = "Materiale Plastice",
title = "Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts",
pages = "159-147",
number = "3",
volume = "57",
doi = "10.37358/MP.20.3.5389"
}

Hasan, M. S., Ivanov, T., Vorkapić, M., Simonović, A., Daou, D., Kovacević, A.,& Milovanović, A.. (2020). Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts. in Materiale Plastice
Revista Chimie Srl, Bucuresti., 57(3), 147-159.
https://doi.org/10.37358/MP.20.3.5389

Hasan MS, Ivanov T, Vorkapić M, Simonović A, Daou D, Kovacević A, Milovanović A. Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts. in Materiale Plastice. 2020;57(3):147-159.
doi:10.37358/MP.20.3.5389 .

Hasan, Mohammad Sakib, Ivanov, Toni, Vorkapić, Miloš, Simonović, Aleksandar, Daou, David, Kovacević, Aleksandar, Milovanović, Aleksa, "Impact of Aging Effect and Heat Treatment on the Tensile Properties of PLA (Poly Lactic Acid) Printed Parts" in Materiale Plastice, 57, no. 3 (2020):147-159,
https://doi.org/10.37358/MP.20.3.5389 . .