TY  - JOUR
AU  - Nešić, Mioljub V.
AU  - Popović, Miroslav
AU  - Galović, Slobodanka
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1061
AB  - The influence of multiple optical reflexions on optically generated surface temperature variations has scarcely been considered throughout the literature. In this work, a model of optically generated heat sources in the sample with low optical absorption coefficient is derived. Multiple optical reflexions are considered at both surfaces of the sample exposed to the intensity-modulated laser beam. The impacts of the reflexion coefficient, the absorption coefficient and the thickness of the sample on the amplitude characteristics of photothermal responses are discussed.
PB  - Springer
T2  - Optical and Quantum Electronics
T1  - The influence of multiple optical reflexions on the photoacoustic frequency response
VL  - 48
IS  - 5
DO  - 10.1007/s11082-016-0564-4
ER  - 

@article{
author = "Nešić, Mioljub V. and Popović, Miroslav and Galović, Slobodanka",
year = "2016",
abstract = "The influence of multiple optical reflexions on optically generated surface temperature variations has scarcely been considered throughout the literature. In this work, a model of optically generated heat sources in the sample with low optical absorption coefficient is derived. Multiple optical reflexions are considered at both surfaces of the sample exposed to the intensity-modulated laser beam. The impacts of the reflexion coefficient, the absorption coefficient and the thickness of the sample on the amplitude characteristics of photothermal responses are discussed.",
publisher = "Springer",
journal = "Optical and Quantum Electronics",
title = "The influence of multiple optical reflexions on the photoacoustic frequency response",
volume = "48",
number = "5",
doi = "10.1007/s11082-016-0564-4"
}

Nešić, M. V., Popović, M.,& Galović, S.. (2016). The influence of multiple optical reflexions on the photoacoustic frequency response. in Optical and Quantum Electronics
Springer., 48(5).
https://doi.org/10.1007/s11082-016-0564-4

Nešić MV, Popović M, Galović S. The influence of multiple optical reflexions on the photoacoustic frequency response. in Optical and Quantum Electronics. 2016;48(5).
doi:10.1007/s11082-016-0564-4 .

Nešić, Mioljub V., Popović, Miroslav, Galović, Slobodanka, "The influence of multiple optical reflexions on the photoacoustic frequency response" in Optical and Quantum Electronics, 48, no. 5 (2016),
https://doi.org/10.1007/s11082-016-0564-4 . .

TY  - JOUR
AU  - Popović, Miroslav
AU  - Nešić, Mioljub V.
AU  - Ciric-Kostic, S.
AU  - Živanov, Miloš
AU  - Markushev, Dragan D.
AU  - Rabasović, Mihailo D.
AU  - Galović, Slobodanka
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1320
AB  - A minimum volume photoacoustic (PA) cell, employed as an acoustic resonator, is presented. A model of the PA cell transfer function, as a combination of two Helmholtz resonators, is derived. Frequency PA response is described as the product of theoretically derived pressure variation and the transfer function of the PA cell. The derived model is applied to the frequency PA measurements, performed on laser-sintered polyamide. It is shown that the derived model explains the occurrence of resonant peaks in the high-frequency domain ( GT 10 kHz), in both amplitude and phase measurements, obtained by a gas-microphone minimal volume PA cell. The implementation of the model in the growing possibilities of sample characterization using gas-microphone PA cell is discussed.
PB  - Springer
T2  - International Journal of Thermophysics
T1  - Helmholtz Resonances in Photoacoustic Experiment with Laser-Sintered Polyamide Including Thermal Memory of Samples
VL  - 37
IS  - 12
DO  - 10.1007/s10765-016-2124-3
ER  - 

@article{
author = "Popović, Miroslav and Nešić, Mioljub V. and Ciric-Kostic, S. and Živanov, Miloš and Markushev, Dragan D. and Rabasović, Mihailo D. and Galović, Slobodanka",
year = "2016",
abstract = "A minimum volume photoacoustic (PA) cell, employed as an acoustic resonator, is presented. A model of the PA cell transfer function, as a combination of two Helmholtz resonators, is derived. Frequency PA response is described as the product of theoretically derived pressure variation and the transfer function of the PA cell. The derived model is applied to the frequency PA measurements, performed on laser-sintered polyamide. It is shown that the derived model explains the occurrence of resonant peaks in the high-frequency domain ( GT 10 kHz), in both amplitude and phase measurements, obtained by a gas-microphone minimal volume PA cell. The implementation of the model in the growing possibilities of sample characterization using gas-microphone PA cell is discussed.",
publisher = "Springer",
journal = "International Journal of Thermophysics",
title = "Helmholtz Resonances in Photoacoustic Experiment with Laser-Sintered Polyamide Including Thermal Memory of Samples",
volume = "37",
number = "12",
doi = "10.1007/s10765-016-2124-3"
}

Popović, M., Nešić, M. V., Ciric-Kostic, S., Živanov, M., Markushev, D. D., Rabasović, M. D.,& Galović, S.. (2016). Helmholtz Resonances in Photoacoustic Experiment with Laser-Sintered Polyamide Including Thermal Memory of Samples. in International Journal of Thermophysics
Springer., 37(12).
https://doi.org/10.1007/s10765-016-2124-3

Popović M, Nešić MV, Ciric-Kostic S, Živanov M, Markushev DD, Rabasović MD, Galović S. Helmholtz Resonances in Photoacoustic Experiment with Laser-Sintered Polyamide Including Thermal Memory of Samples. in International Journal of Thermophysics. 2016;37(12).
doi:10.1007/s10765-016-2124-3 .

Popović, Miroslav, Nešić, Mioljub V., Ciric-Kostic, S., Živanov, Miloš, Markushev, Dragan D., Rabasović, Mihailo D., Galović, Slobodanka, "Helmholtz Resonances in Photoacoustic Experiment with Laser-Sintered Polyamide Including Thermal Memory of Samples" in International Journal of Thermophysics, 37, no. 12 (2016),
https://doi.org/10.1007/s10765-016-2124-3 . .

TY  - CONF
AU  - Zelić Mihajlović, Ksenija
AU  - Milovanović, Petar
AU  - Rakočević, Zlatko Lj.
AU  - Aškrabić, Sonja
AU  - Potočnik, Jelena
AU  - Popović, Miroslav
AU  - Đurić, Marija
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10778
AB  - Tooth fracture is considered as a major problem in dentistry. As it is commonly observed in dental practice, one of the main factors that lead to increased tooth fragility is its devitalization. However, there is no definite mechanistic explanation for such phenomenon. We hypothesize that the possible response to this matter lies in the changes that occur in dentin due to altered microenvironment after endodontic procedure. Therefore, in this study we analyzed the structural and compositional differences between vital and devitalized dentine.  Atomic force microscopic imaging (AFM), and micro-Raman spectroscopy were performed on 16 dentine specimens, eight taken from vital teeth and eight taken from teeth that underwent root-canal treatment at least 2 years before extraction and had no infection in root canals. All teeth were upper premolars.  The mean size of mineral grains, showed by AFM topography images, was larger in devitalized than in healthy dentine in the same age category. AFM phase shifts in devitalized cases revealed altered mechanical characteristics and suggested differences in composition of material between devitalized teeth and healthy controls. Micro-Raman analyses showed that in devitalized teeth, apart from hydroxyapatite, dentine contained significant amounts of apatite phases with lower calcium content: octacalcium phosphate, dicalcium phosphate dihidrate and tricalcium phosphate.  Differences between vital and devitalized dentine bring new insight into basis of devitalized tooth fragility. Larger mineral grains could account for decreased mechanical strength in devitalized teeth. Moreover, calcium-phosphate phases with lower Ca content have lower material strength, and the presence of these phases in devitalized teeth may explain their increased fragility.
C3  - European Calcified Tissue Society Congress 2013 : Bone Abstracts
T1  - Nano-structural and compositional basis of devitalized tooth fragility
VL  - 1
SP  - pp49
DO  - 10.1530/boneabs.1.PP49
ER  - 

@conference{
author = "Zelić Mihajlović, Ksenija and Milovanović, Petar and Rakočević, Zlatko Lj. and Aškrabić, Sonja and Potočnik, Jelena and Popović, Miroslav and Đurić, Marija",
year = "2013",
abstract = "Tooth fracture is considered as a major problem in dentistry. As it is commonly observed in dental practice, one of the main factors that lead to increased tooth fragility is its devitalization. However, there is no definite mechanistic explanation for such phenomenon. We hypothesize that the possible response to this matter lies in the changes that occur in dentin due to altered microenvironment after endodontic procedure. Therefore, in this study we analyzed the structural and compositional differences between vital and devitalized dentine.  Atomic force microscopic imaging (AFM), and micro-Raman spectroscopy were performed on 16 dentine specimens, eight taken from vital teeth and eight taken from teeth that underwent root-canal treatment at least 2 years before extraction and had no infection in root canals. All teeth were upper premolars.  The mean size of mineral grains, showed by AFM topography images, was larger in devitalized than in healthy dentine in the same age category. AFM phase shifts in devitalized cases revealed altered mechanical characteristics and suggested differences in composition of material between devitalized teeth and healthy controls. Micro-Raman analyses showed that in devitalized teeth, apart from hydroxyapatite, dentine contained significant amounts of apatite phases with lower calcium content: octacalcium phosphate, dicalcium phosphate dihidrate and tricalcium phosphate.  Differences between vital and devitalized dentine bring new insight into basis of devitalized tooth fragility. Larger mineral grains could account for decreased mechanical strength in devitalized teeth. Moreover, calcium-phosphate phases with lower Ca content have lower material strength, and the presence of these phases in devitalized teeth may explain their increased fragility.",
journal = "European Calcified Tissue Society Congress 2013 : Bone Abstracts",
title = "Nano-structural and compositional basis of devitalized tooth fragility",
volume = "1",
pages = "pp49",
doi = "10.1530/boneabs.1.PP49"
}

Zelić Mihajlović, K., Milovanović, P., Rakočević, Z. Lj., Aškrabić, S., Potočnik, J., Popović, M.,& Đurić, M.. (2013). Nano-structural and compositional basis of devitalized tooth fragility. in European Calcified Tissue Society Congress 2013 : Bone Abstracts, 1, pp49.
https://doi.org/10.1530/boneabs.1.PP49

Zelić Mihajlović K, Milovanović P, Rakočević ZL, Aškrabić S, Potočnik J, Popović M, Đurić M. Nano-structural and compositional basis of devitalized tooth fragility. in European Calcified Tissue Society Congress 2013 : Bone Abstracts. 2013;1:pp49.
doi:10.1530/boneabs.1.PP49 .

Zelić Mihajlović, Ksenija, Milovanović, Petar, Rakočević, Zlatko Lj., Aškrabić, Sonja, Potočnik, Jelena, Popović, Miroslav, Đurić, Marija, "Nano-structural and compositional basis of devitalized tooth fragility" in European Calcified Tissue Society Congress 2013 : Bone Abstracts, 1 (2013):pp49,
https://doi.org/10.1530/boneabs.1.PP49 . .