TY  - JOUR
AU  - Stojanovic, Dusica
AU  - Brajović, Ljiljana
AU  - Obradovic, Vera
AU  - Mijailovic, Daniel
AU  - Dramlic, Dragan
AU  - Kojovic, Aleksandar
AU  - Uskokovic, Petar
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1946
AB  - The composite nanofibers were used as reinforcement in acrylic polymer for the overall enhancement of thermomechanical
properties, adhesion between fibers and matrix, and fracture toughness of the final nanocomposite
since acrylic materials lack of this feature. So, a good balance between hardness/toughness and transparency is
obtained with the addition of poly (vinyl butyral) (PVB) and titania (TiO2) nanofibers simultaneously and
controlling their contents. Specifically, when compared to that of pure acrylic polymer, the fracture toughness of
the PMMA nanocomposite apparently increased 55 % with the addition of 3 wt.% titania nanoparticles, while
the produced nanocomposite maintained high transmittance above 75–80% in the visible domain. The transmission
spectrum modelling of the reinforced fiber materials and hybrid acrylic composites using Mie scattering
theory for different particle sizes and particle content is presented. The calculated transmission coefficients
versus wavelength are compared with the experimental ones.
PB  - Elsevier
T2  - Progress in Organic Coatings
T1  - Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance
SP  - 105437
VL  - 139
VL  - 139
DO  - 10.1016/j.porgcoat.2019.105437
ER  - 

@article{
author = "Stojanovic, Dusica and Brajović, Ljiljana and Obradovic, Vera and Mijailovic, Daniel and Dramlic, Dragan and Kojovic, Aleksandar and Uskokovic, Petar",
year = "2020",
abstract = "The composite nanofibers were used as reinforcement in acrylic polymer for the overall enhancement of thermomechanical
properties, adhesion between fibers and matrix, and fracture toughness of the final nanocomposite
since acrylic materials lack of this feature. So, a good balance between hardness/toughness and transparency is
obtained with the addition of poly (vinyl butyral) (PVB) and titania (TiO2) nanofibers simultaneously and
controlling their contents. Specifically, when compared to that of pure acrylic polymer, the fracture toughness of
the PMMA nanocomposite apparently increased 55 % with the addition of 3 wt.% titania nanoparticles, while
the produced nanocomposite maintained high transmittance above 75–80% in the visible domain. The transmission
spectrum modelling of the reinforced fiber materials and hybrid acrylic composites using Mie scattering
theory for different particle sizes and particle content is presented. The calculated transmission coefficients
versus wavelength are compared with the experimental ones.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance",
pages = "105437",
volume = "139, 139",
doi = "10.1016/j.porgcoat.2019.105437"
}

Stojanovic, D., Brajović, L., Obradovic, V., Mijailovic, D., Dramlic, D., Kojovic, A.,& Uskokovic, P.. (2020). Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance. in Progress in Organic Coatings
Elsevier., 139, 105437.
https://doi.org/10.1016/j.porgcoat.2019.105437

Stojanovic D, Brajović L, Obradovic V, Mijailovic D, Dramlic D, Kojovic A, Uskokovic P. Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance. in Progress in Organic Coatings. 2020;139:105437.
doi:10.1016/j.porgcoat.2019.105437 .

Stojanovic, Dusica, Brajović, Ljiljana, Obradovic, Vera, Mijailovic, Daniel, Dramlic, Dragan, Kojovic, Aleksandar, Uskokovic, Petar, "Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance" in Progress in Organic Coatings, 139 (2020):105437,
https://doi.org/10.1016/j.porgcoat.2019.105437 . .

TY  - JOUR
AU  - Brajović, Ljiljana
AU  - Stojanović, Dušica B.
AU  - Mihailović, Pedja
AU  - Marković, Smilja
AU  - Romcević, Maja
AU  - Mitrić, Miodrag N.
AU  - Lazović, Vladimir
AU  - Dramlić, Dragan
AU  - Petricević, Slobodan
AU  - Romcević, Nebojsa
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/853
AB  - Bismuth germanium oxide Bi12GeO20 (BGO) has very interesting electrical, optical and magnetic properties. In order to make devices based on this material more flexible, its powder was used for preparing polymer composites. This study reports investigation of the effects of using different solvents and polymers in preparation of BGO composite on the microstructural and optical behaviour of the resulting material. Preparation of such composites by a solution casting method is described. Poly (methyl methacrylate) (PMMA) and polystyrene (PS)) were used as matrix materials and acetone and chloroform as solvents. Their microstructure and the quality of BGO dispersion and deaggregation in polymer matrix were analyzed by SEM, Raman, XRD and optical spectroscopy. The influence of particle size distribution, their shapes, and concentration on the optical transmission is calculated based on Mie scattering theory and discussed, too.
PB  - Elsevier Ltd
T2  - Journal of Alloys and Compounds
T1  - Preparation and characterization of bismuth germanium oxide (BGO) polymer composites
EP  - 849
SP  - 841
VL  - 695
DO  - 10.1016/j.jallcom.2016.10.140
ER  - 

@article{
author = "Brajović, Ljiljana and Stojanović, Dušica B. and Mihailović, Pedja and Marković, Smilja and Romcević, Maja and Mitrić, Miodrag N. and Lazović, Vladimir and Dramlić, Dragan and Petricević, Slobodan and Romcević, Nebojsa",
year = "2017",
abstract = "Bismuth germanium oxide Bi12GeO20 (BGO) has very interesting electrical, optical and magnetic properties. In order to make devices based on this material more flexible, its powder was used for preparing polymer composites. This study reports investigation of the effects of using different solvents and polymers in preparation of BGO composite on the microstructural and optical behaviour of the resulting material. Preparation of such composites by a solution casting method is described. Poly (methyl methacrylate) (PMMA) and polystyrene (PS)) were used as matrix materials and acetone and chloroform as solvents. Their microstructure and the quality of BGO dispersion and deaggregation in polymer matrix were analyzed by SEM, Raman, XRD and optical spectroscopy. The influence of particle size distribution, their shapes, and concentration on the optical transmission is calculated based on Mie scattering theory and discussed, too.",
publisher = "Elsevier Ltd",
journal = "Journal of Alloys and Compounds",
title = "Preparation and characterization of bismuth germanium oxide (BGO) polymer composites",
pages = "849-841",
volume = "695",
doi = "10.1016/j.jallcom.2016.10.140"
}

Brajović, L., Stojanović, D. B., Mihailović, P., Marković, S., Romcević, M., Mitrić, M. N., Lazović, V., Dramlić, D., Petricević, S.,& Romcević, N.. (2017). Preparation and characterization of bismuth germanium oxide (BGO) polymer composites. in Journal of Alloys and Compounds
Elsevier Ltd., 695, 841-849.
https://doi.org/10.1016/j.jallcom.2016.10.140

Brajović L, Stojanović DB, Mihailović P, Marković S, Romcević M, Mitrić MN, Lazović V, Dramlić D, Petricević S, Romcević N. Preparation and characterization of bismuth germanium oxide (BGO) polymer composites. in Journal of Alloys and Compounds. 2017;695:841-849.
doi:10.1016/j.jallcom.2016.10.140 .

Brajović, Ljiljana, Stojanović, Dušica B., Mihailović, Pedja, Marković, Smilja, Romcević, Maja, Mitrić, Miodrag N., Lazović, Vladimir, Dramlić, Dragan, Petricević, Slobodan, Romcević, Nebojsa, "Preparation and characterization of bismuth germanium oxide (BGO) polymer composites" in Journal of Alloys and Compounds, 695 (2017):841-849,
https://doi.org/10.1016/j.jallcom.2016.10.140 . .

TY  - JOUR
AU  - Petrović, Miloš
AU  - Mihailović, Pedja
AU  - Brajović, Ljiljana
AU  - Petricević, Slobodan
AU  - Živković, Irena
AU  - Kojović, Aleksandar
AU  - Radojević, Vesna
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/796
AB  - In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.
PB  - Institute of Electrical and Electronics Engineers Inc.
T2  - Ieee Sensors Journal
T1  - Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester
EP  - 3053
IS  - 9
SP  - 3047
VL  - 16
DO  - 10.1109/JSEN.2016.2524045
ER  - 

@article{
author = "Petrović, Miloš and Mihailović, Pedja and Brajović, Ljiljana and Petricević, Slobodan and Živković, Irena and Kojović, Aleksandar and Radojević, Vesna",
year = "2016",
abstract = "In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
journal = "Ieee Sensors Journal",
title = "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester",
pages = "3053-3047",
number = "9",
volume = "16",
doi = "10.1109/JSEN.2016.2524045"
}

Petrović, M., Mihailović, P., Brajović, L., Petricević, S., Živković, I., Kojović, A.,& Radojević, V.. (2016). Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in Ieee Sensors Journal
Institute of Electrical and Electronics Engineers Inc.., 16(9), 3047-3053.
https://doi.org/10.1109/JSEN.2016.2524045

Petrović M, Mihailović P, Brajović L, Petricević S, Živković I, Kojović A, Radojević V. Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in Ieee Sensors Journal. 2016;16(9):3047-3053.
doi:10.1109/JSEN.2016.2524045 .

Petrović, Miloš, Mihailović, Pedja, Brajović, Ljiljana, Petricević, Slobodan, Živković, Irena, Kojović, Aleksandar, Radojević, Vesna, "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester" in Ieee Sensors Journal, 16, no. 9 (2016):3047-3053,
https://doi.org/10.1109/JSEN.2016.2524045 . .

TY  - JOUR
AU  - Kovacević, Aleksander
AU  - Ristic-Djurović, Jasna L.
AU  - Lekić, Marina
AU  - Hadžić, Branka
AU  - Abudagel, Giuma Saleh Isa
AU  - Petričević, Slobodan
AU  - Mihailović, Pedja
AU  - Matović, Branko
AU  - Dramlić, Dragan
AU  - Brajović, Ljiljana
AU  - Romčević, Nebojsa
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/762
AB  - High quality bismuth germanium oxide single crystals were irradiated by a femtosecond pulsed laser beam of increasing power. Analyses performed on irradiated and unirradiated samples showed significant changes in transmittance, transmission spectra, sample color, Raman spectra, X-ray diffraction (XRD) pattern, Verdet constant, magneto-optical property, and absorption coefficient. After irradiation, the transmission spectra values increased whereas anisotropy detected in the transmission spectra of unirradiated samples disappeared. The change of color caused by irradiation was noticeable to the naked eye. The XRD measurements confirmed structural changes induced by laser irradiation, i.e., the laser-beam-incident side of the sample became almost amorphous, whereas the side opposite to the incident can be indexed to the Bi12GeO20 compound. Irradiation caused increase of Raman spectra peaks with the exception of crystal peaks of type E, which disappeared. The femtosecond pulsed laser irradiation can be used to improve bismuth germanium oxide single crystal optical properties.
PB  - Elsevier Ltd
T2  - Materials Research Bulletin
T1  - Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties
EP  - 289
SP  - 284
VL  - 83
DO  - 10.1016/j.materresbull.2016.06.023
ER  - 

@article{
author = "Kovacević, Aleksander and Ristic-Djurović, Jasna L. and Lekić, Marina and Hadžić, Branka and Abudagel, Giuma Saleh Isa and Petričević, Slobodan and Mihailović, Pedja and Matović, Branko and Dramlić, Dragan and Brajović, Ljiljana and Romčević, Nebojsa",
year = "2016",
abstract = "High quality bismuth germanium oxide single crystals were irradiated by a femtosecond pulsed laser beam of increasing power. Analyses performed on irradiated and unirradiated samples showed significant changes in transmittance, transmission spectra, sample color, Raman spectra, X-ray diffraction (XRD) pattern, Verdet constant, magneto-optical property, and absorption coefficient. After irradiation, the transmission spectra values increased whereas anisotropy detected in the transmission spectra of unirradiated samples disappeared. The change of color caused by irradiation was noticeable to the naked eye. The XRD measurements confirmed structural changes induced by laser irradiation, i.e., the laser-beam-incident side of the sample became almost amorphous, whereas the side opposite to the incident can be indexed to the Bi12GeO20 compound. Irradiation caused increase of Raman spectra peaks with the exception of crystal peaks of type E, which disappeared. The femtosecond pulsed laser irradiation can be used to improve bismuth germanium oxide single crystal optical properties.",
publisher = "Elsevier Ltd",
journal = "Materials Research Bulletin",
title = "Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties",
pages = "289-284",
volume = "83",
doi = "10.1016/j.materresbull.2016.06.023"
}

Kovacević, A., Ristic-Djurović, J. L., Lekić, M., Hadžić, B., Abudagel, G. S. I., Petričević, S., Mihailović, P., Matović, B., Dramlić, D., Brajović, L.,& Romčević, N.. (2016). Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties. in Materials Research Bulletin
Elsevier Ltd., 83, 284-289.
https://doi.org/10.1016/j.materresbull.2016.06.023

Kovacević A, Ristic-Djurović JL, Lekić M, Hadžić B, Abudagel GSI, Petričević S, Mihailović P, Matović B, Dramlić D, Brajović L, Romčević N. Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties. in Materials Research Bulletin. 2016;83:284-289.
doi:10.1016/j.materresbull.2016.06.023 .

Kovacević, Aleksander, Ristic-Djurović, Jasna L., Lekić, Marina, Hadžić, Branka, Abudagel, Giuma Saleh Isa, Petričević, Slobodan, Mihailović, Pedja, Matović, Branko, Dramlić, Dragan, Brajović, Ljiljana, Romčević, Nebojsa, "Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties" in Materials Research Bulletin, 83 (2016):284-289,
https://doi.org/10.1016/j.materresbull.2016.06.023 . .

TY  - CONF
AU  - Srećković, Milesa
AU  - Ostojić, Stanko
AU  - Tomić, Željka
AU  - Ratković-Kovačević, Nada
AU  - Jevtić, Sanja
AU  - Bugarinović, Aleksandar
AU  - Jevtić, Dragan
AU  - Dragović, Magdalena
AU  - Rakić, Jasmina
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1285
AB  - Primena lasera sa procesima rasejanja i interakcije zahteva rešavanje teorijskih problema, koji se razvojem računarskih alata svode na brze provere. Zadaci u vezi metroloških problematika pokrivaju zadatake sa angularnom raspodelom, monohromatskih i polihromatskih problema matrice rasejanja, specijalne funkcije ili komponentni prilaz definisanim geometrijama i koherentnih osobina snopa, rasejavača i ugla posmattranja. Laserski snopovi velikog intenziteta izazivaju niz efekata u atmosferi ili u prolazu kroz materijal, uključujući i disturbanse u rezonatorima zbog uticaja elastičnih i neelastičnih rasejanja i promene koeficijenata refleksije elemenata (ogledala), koji su u radnom prostoru kvantnog generatora-pojačavača. Rad se bavi izabranom problematikom teorijsko-analitičko-numeričke prirode i pored pozivanja na zadatke iz prakse, analizira podrške informacione tehnologije.
PB  - Elektrotehnički fakultet, Istočno Sarajevo
C3  - Zbornik radova / XIV međunarodni naučno-stručni simpozijum Infoteh-Jahorina 2015, Jahorina, hotel Bistrica, 18. mart - 20. mart 2015
T1  - Analytical and numerical apparatuses for application of laser for diagnosis in the linear and non-linear area
T1  - Analitički i numerički aparati za primene lasera u dijagnostičke svrhe u linearnoj i nelinearnoj oblasti
EP  - 787
SP  - 782
VL  - 14
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1285
ER  - 

@conference{
author = "Srećković, Milesa and Ostojić, Stanko and Tomić, Željka and Ratković-Kovačević, Nada and Jevtić, Sanja and Bugarinović, Aleksandar and Jevtić, Dragan and Dragović, Magdalena and Rakić, Jasmina",
year = "2015",
abstract = "Primena lasera sa procesima rasejanja i interakcije zahteva rešavanje teorijskih problema, koji se razvojem računarskih alata svode na brze provere. Zadaci u vezi metroloških problematika pokrivaju zadatake sa angularnom raspodelom, monohromatskih i polihromatskih problema matrice rasejanja, specijalne funkcije ili komponentni prilaz definisanim geometrijama i koherentnih osobina snopa, rasejavača i ugla posmattranja. Laserski snopovi velikog intenziteta izazivaju niz efekata u atmosferi ili u prolazu kroz materijal, uključujući i disturbanse u rezonatorima zbog uticaja elastičnih i neelastičnih rasejanja i promene koeficijenata refleksije elemenata (ogledala), koji su u radnom prostoru kvantnog generatora-pojačavača. Rad se bavi izabranom problematikom teorijsko-analitičko-numeričke prirode i pored pozivanja na zadatke iz prakse, analizira podrške informacione tehnologije.",
publisher = "Elektrotehnički fakultet, Istočno Sarajevo",
journal = "Zbornik radova / XIV međunarodni naučno-stručni simpozijum Infoteh-Jahorina 2015, Jahorina, hotel Bistrica, 18. mart - 20. mart 2015",
title = "Analytical and numerical apparatuses for application of laser for diagnosis in the linear and non-linear area, Analitički i numerički aparati za primene lasera u dijagnostičke svrhe u linearnoj i nelinearnoj oblasti",
pages = "787-782",
volume = "14",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1285"
}

Srećković, M., Ostojić, S., Tomić, Ž., Ratković-Kovačević, N., Jevtić, S., Bugarinović, A., Jevtić, D., Dragović, M.,& Rakić, J.. (2015). Analytical and numerical apparatuses for application of laser for diagnosis in the linear and non-linear area. in Zbornik radova / XIV međunarodni naučno-stručni simpozijum Infoteh-Jahorina 2015, Jahorina, hotel Bistrica, 18. mart - 20. mart 2015
Elektrotehnički fakultet, Istočno Sarajevo., 14, 782-787.
https://hdl.handle.net/21.15107/rcub_grafar_1285

Srećković M, Ostojić S, Tomić Ž, Ratković-Kovačević N, Jevtić S, Bugarinović A, Jevtić D, Dragović M, Rakić J. Analytical and numerical apparatuses for application of laser for diagnosis in the linear and non-linear area. in Zbornik radova / XIV međunarodni naučno-stručni simpozijum Infoteh-Jahorina 2015, Jahorina, hotel Bistrica, 18. mart - 20. mart 2015. 2015;14:782-787.
https://hdl.handle.net/21.15107/rcub_grafar_1285 .

Srećković, Milesa, Ostojić, Stanko, Tomić, Željka, Ratković-Kovačević, Nada, Jevtić, Sanja, Bugarinović, Aleksandar, Jevtić, Dragan, Dragović, Magdalena, Rakić, Jasmina, "Analytical and numerical apparatuses for application of laser for diagnosis in the linear and non-linear area" in Zbornik radova / XIV međunarodni naučno-stručni simpozijum Infoteh-Jahorina 2015, Jahorina, hotel Bistrica, 18. mart - 20. mart 2015, 14 (2015):782-787,
https://hdl.handle.net/21.15107/rcub_grafar_1285 .