TY  - CONF
AU  - Davidovic, Milos
AU  - Kleut, Duška
AU  - Davidović, Milena
AU  - Stojanović, Danka
AU  - Jovašević-Stojanović, Milena
PY  - 2023
UR  - http://www.photonicsworkshop.ipb.ac.rs/16/index.php/time-table
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3131
AB  - Atmospheric aerosols in urban areas typically consist of particles of different
diameters, which can range in size from a few nanometers to a few micrometers and can have
a strong impact on human health [1,2]. This motivates the need to measure aerosol
concentration accurately, but it is often also necessary to combine results from several
instruments, with fundamentally different measurement principles. In this work, methods
based on the measurement of the electrical mobility of particles, for the range of diameters
from 10nm to 420nm, and the measurement of the equivalent optical diameter, for the range
of diameters from 300nm to 10um, were used. Combining the overlapping region in two size
distribution spectra can be used to infer equivalent optical properties of the ambient aerosol,
and examples of measured and combined spectra in several urban hot spots in Bay of Kotor
are analyzed in some detail. These examples will illustrate several aspects of urban aerosol
properties not readily available in a typical regulatory monitoring setting, such as distribution
of modes in number and mass concentration, as well as optical properties of measured aerosol.
As the main result, examples of combining particle size spectrums are presented. In the
process of combining the particle size spectra, it is possible to modify the distribution
obtained by optical measurements by searching for the optimal value of the refractive index
of the particles to obtain the best possible agreement with the size distribution obtained by
measuring the electrical mobility. An equivalent refractive index as well as the equivalent
shape factor of the ambient aerosol is obtained using Mie scattering theory as a theoretical
framework [3]. The measurement results from the mobile monitoring campaign in Bay of
Kotor in 2017 were used to elucidate the main principles of size spectrum combination, as
well as to showcase diversity of equivalent optical properties of urban aerosols.
Funding for this work has been provided by the EU H2020 Framework Programme for
research and innovation under grant agreement no 952433 (VIDIS); Ministry of Education,
Science and Technological Development of the Republic of Serbia under contract number
451-03-47/2023-01/ 200017 which is being realized in Vinca Institute of Nuclear Sciences.
C3  - 16th Photonics Workshop: Kopaonik, March 12-15
T1  - Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3131
ER  - 

@conference{
author = "Davidovic, Milos and Kleut, Duška and Davidović, Milena and Stojanović, Danka and Jovašević-Stojanović, Milena",
year = "2023",
abstract = "Atmospheric aerosols in urban areas typically consist of particles of different
diameters, which can range in size from a few nanometers to a few micrometers and can have
a strong impact on human health [1,2]. This motivates the need to measure aerosol
concentration accurately, but it is often also necessary to combine results from several
instruments, with fundamentally different measurement principles. In this work, methods
based on the measurement of the electrical mobility of particles, for the range of diameters
from 10nm to 420nm, and the measurement of the equivalent optical diameter, for the range
of diameters from 300nm to 10um, were used. Combining the overlapping region in two size
distribution spectra can be used to infer equivalent optical properties of the ambient aerosol,
and examples of measured and combined spectra in several urban hot spots in Bay of Kotor
are analyzed in some detail. These examples will illustrate several aspects of urban aerosol
properties not readily available in a typical regulatory monitoring setting, such as distribution
of modes in number and mass concentration, as well as optical properties of measured aerosol.
As the main result, examples of combining particle size spectrums are presented. In the
process of combining the particle size spectra, it is possible to modify the distribution
obtained by optical measurements by searching for the optimal value of the refractive index
of the particles to obtain the best possible agreement with the size distribution obtained by
measuring the electrical mobility. An equivalent refractive index as well as the equivalent
shape factor of the ambient aerosol is obtained using Mie scattering theory as a theoretical
framework [3]. The measurement results from the mobile monitoring campaign in Bay of
Kotor in 2017 were used to elucidate the main principles of size spectrum combination, as
well as to showcase diversity of equivalent optical properties of urban aerosols.
Funding for this work has been provided by the EU H2020 Framework Programme for
research and innovation under grant agreement no 952433 (VIDIS); Ministry of Education,
Science and Technological Development of the Republic of Serbia under contract number
451-03-47/2023-01/ 200017 which is being realized in Vinca Institute of Nuclear Sciences.",
journal = "16th Photonics Workshop: Kopaonik, March 12-15",
title = "Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3131"
}

Davidovic, M., Kleut, D., Davidović, M., Stojanović, D.,& Jovašević-Stojanović, M.. (2023). Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor. in 16th Photonics Workshop: Kopaonik, March 12-15.
https://hdl.handle.net/21.15107/rcub_grafar_3131

Davidovic M, Kleut D, Davidović M, Stojanović D, Jovašević-Stojanović M. Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor. in 16th Photonics Workshop: Kopaonik, March 12-15. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3131 .

Davidovic, Milos, Kleut, Duška, Davidović, Milena, Stojanović, Danka, Jovašević-Stojanović, Milena, "Combining size distribution spectrums of ambient aerosols using equivalent optical properties of nanosized particles selected examples from the Bay of Kotor" in 16th Photonics Workshop: Kopaonik, March 12-15 (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3131 .

TY  - CONF
AU  - Davidovic, Milos
AU  - Davidović, Milena
AU  - Dmitrašinović, Sonja
AU  - Srećković, Milesa
AU  - Jovašević-Stojanović, Milena
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3130
AB  - Atmosferski aerosoli u urbanim sredinama se
sastoje od čestica različitih dijametara, koje mogu imati veličinu
od par nanometara do par mikrometara. Stoga je za merenje
koncentracije aerosola često neophodno koristiti više
instrumenata, sa principijelno različitim metodama merenja. U
ovom radu su korišćene metode zasnovane na merenju električne
pokretljivosti čestica, za opseg dijametara od 10nm do 420nm, i
merenju ekvivalentnog optičkog dijametra, za opseg dijametara
od 300nm do 10um. Kao glavni rezultat, prikazani su primeri
kombinovanja spektara veličina čestica koji su dobijeni pomoću
ove dve komplementarne metode merenja. U procesu
kombinovanja spektara veličina čestica moguće je modifikovati
raspodelu dobijenu optičkim merenjima traženjem optimalne
vrednosti indeksa prelamanja čestica tako da se dobije što bolje
slaganje sa raspodelom dobijenom merenjem električne
pokretljivosti. Kao ulazni podaci su korišćeni rezultati merenja
iz kampanje mobilnog monitoringa u Novom Sadu 2022.
C3  - Zbornik radova, LXVI konferencija ETRAN
T1  - Primer kombinovanja raspodele atmosferskih aerosola po veličinama dobijenih metodom merenja električne pokretljivosti i optičkom metodom
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3130
ER  - 

@conference{
author = "Davidovic, Milos and Davidović, Milena and Dmitrašinović, Sonja and Srećković, Milesa and Jovašević-Stojanović, Milena",
year = "2022",
abstract = "Atmosferski aerosoli u urbanim sredinama se
sastoje od čestica različitih dijametara, koje mogu imati veličinu
od par nanometara do par mikrometara. Stoga je za merenje
koncentracije aerosola često neophodno koristiti više
instrumenata, sa principijelno različitim metodama merenja. U
ovom radu su korišćene metode zasnovane na merenju električne
pokretljivosti čestica, za opseg dijametara od 10nm do 420nm, i
merenju ekvivalentnog optičkog dijametra, za opseg dijametara
od 300nm do 10um. Kao glavni rezultat, prikazani su primeri
kombinovanja spektara veličina čestica koji su dobijeni pomoću
ove dve komplementarne metode merenja. U procesu
kombinovanja spektara veličina čestica moguće je modifikovati
raspodelu dobijenu optičkim merenjima traženjem optimalne
vrednosti indeksa prelamanja čestica tako da se dobije što bolje
slaganje sa raspodelom dobijenom merenjem električne
pokretljivosti. Kao ulazni podaci su korišćeni rezultati merenja
iz kampanje mobilnog monitoringa u Novom Sadu 2022.",
journal = "Zbornik radova, LXVI konferencija ETRAN",
title = "Primer kombinovanja raspodele atmosferskih aerosola po veličinama dobijenih metodom merenja električne pokretljivosti i optičkom metodom",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3130"
}

Davidovic, M., Davidović, M., Dmitrašinović, S., Srećković, M.,& Jovašević-Stojanović, M.. (2022). Primer kombinovanja raspodele atmosferskih aerosola po veličinama dobijenih metodom merenja električne pokretljivosti i optičkom metodom. in Zbornik radova, LXVI konferencija ETRAN.
https://hdl.handle.net/21.15107/rcub_grafar_3130

Davidovic M, Davidović M, Dmitrašinović S, Srećković M, Jovašević-Stojanović M. Primer kombinovanja raspodele atmosferskih aerosola po veličinama dobijenih metodom merenja električne pokretljivosti i optičkom metodom. in Zbornik radova, LXVI konferencija ETRAN. 2022;.
https://hdl.handle.net/21.15107/rcub_grafar_3130 .

Davidovic, Milos, Davidović, Milena, Dmitrašinović, Sonja, Srećković, Milesa, Jovašević-Stojanović, Milena, "Primer kombinovanja raspodele atmosferskih aerosola po veličinama dobijenih metodom merenja električne pokretljivosti i optičkom metodom" in Zbornik radova, LXVI konferencija ETRAN (2022),
https://hdl.handle.net/21.15107/rcub_grafar_3130 .

TY  - CONF
AU  - Rajaković-Ognjanović, Vladana
AU  - Dašić, Tina
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2464
AB  - Pri planiranju akumulacionih hidroelektrana, važan segment je i adekvatan monitoring kvaliteta vode. Uz odgovarajući monitoring program omogućava se višenamensko korišćenje veštačkih jezera. Eutrofikacija vode u jezeru je fenomen koji je prisutan kod svih jezera. Posledica eutrofikacije jeste ugroženost akvatičnog ekosistema. Eutrofikacija je fenomen koji nastaje kao odgovor akvatičnog ekosistema na povećanu koncentraciju nutrijenata, fosfora (P) i azota (N), usled prirodnih i antropogenih aktivnosti.  Pored osnovnih, klasičnih pokazatelja kvaliteta vode koji su u korelaciji sa eutrofikacijom najnovija istraživanja pokazuju da su jezera sve više izložena eutrofikaciji usled klimatskih promena i opšte prisutnog zagađenja životne sredine. U ovom radu prikazani su rezultati analize kvaliteta vode reke Komarnice, u Crnoj Gori na kojoj se planira izgradnja akumulacione pribranske HE Komarnica. Ključni zaključci istraživanja su: uvesti monitoring (permanentnu kontrolu) kvaliteta vode u jezerima kako bi se što uspešnije kontrolisala i sprečila eutrofikacija. Izuzetno je važno razumeti da ne postoji jedinstvena jednačina ili formula koja bi mogla da važi za monitoring svih jezera. Svako jezero ima svoje jedinstvene karakteristike. Zavisnost hlorofila, koncentracije fosfora i zapremine jezera menja se u zavisnosti od meseca, sezone i godine. Predlog za monitoring kvaliteta vode na jezeru koje će biti izgrađeno na Komarnici, koje predstavlja deo sistema buduće hidroelektrane je mesečno praćenje koncentracije hlorofila, nutrijenata i zapremine jezera.  Sezonsko praćenje zavisi od padavina, hidroloških i limnoloških karakteristika i trendova sušnih i kišnih epizoda. Analize i dosadašnja istraživanja su pokazala da uvođenje obaveznih parametara za praćenje kvaliteta vode ne poskupljuje proizvodnju električne energije i očuvanje energije, a značajno poboljšava i unapređuje kvalitet životne sredine.
AB  - When planning the construction of a hydroelectric power plant, an important segment is adequate monitoring of water quality. With an appropriate monitoring program, the multifunctional use of artificial lakes is enabled. Eutrophication (nutrient over-enrichment) of water in a lake is a phenomenon that has been noticed in all lakes. The consequence of eutrophication is the endangerment of the aquatic ecosystem. Eutrophication is a phenomenon that occurs as a response of the aquatic ecosystem to the increased concentration of nutrients, phosphorus (P) and nitrogen (N), due to natural and anthropogenic activities. Recent research indicates a correlation between local climate change and water circulation and the impact of climate change on all phenomena in the hydrological cycle. Temperature fluctuations, huge amounts of rain when precipitation is analysed, constant heating and increase in humidity all affect more intense eutrophication. The key conclusions of the research dealing with the construction of the hydroelectric power plant in Komarnica are: to introduce monitoring (permanent control) of water quality in lakes in order to minimize or control, even prevent eutrophication. Each artificial lake has its own unique characteristics. The dependence of chlorophyll, phosphorus and lake volume varies depending on the month, season and year. The proposal for the lake that will be built on Komarnica, which is part of the future hydroelectric power plant, is a monthly monitoring of the concentration of chlorophyll, nutrients and the volume of the lake. Seasonal monitoring depends on precipitation, hydrological and limnological characteristics and trends of dry and rainy episodes. Analyzes and previous research have shown that the introduction of mandatory parameters for monitoring water quality does not increase the cost of electricity production and energy conservation, but significantly improves and enhances the quality of the environment.
PB  - Savez energetičara
C3  - Zbornik radova Energetika 2021 - U susret zelenom oporavku, Zlatibor
T1  - Značaj monitoringa kvaliteta vode u jezerima hidroelektrana
T1  - The Significance of Monitoring of Water Quality in Hydropower Lakes
EP  - 206
SP  - 203
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2464
ER  - 

@conference{
author = "Rajaković-Ognjanović, Vladana and Dašić, Tina",
year = "2021",
abstract = "Pri planiranju akumulacionih hidroelektrana, važan segment je i adekvatan monitoring kvaliteta vode. Uz odgovarajući monitoring program omogućava se višenamensko korišćenje veštačkih jezera. Eutrofikacija vode u jezeru je fenomen koji je prisutan kod svih jezera. Posledica eutrofikacije jeste ugroženost akvatičnog ekosistema. Eutrofikacija je fenomen koji nastaje kao odgovor akvatičnog ekosistema na povećanu koncentraciju nutrijenata, fosfora (P) i azota (N), usled prirodnih i antropogenih aktivnosti.  Pored osnovnih, klasičnih pokazatelja kvaliteta vode koji su u korelaciji sa eutrofikacijom najnovija istraživanja pokazuju da su jezera sve više izložena eutrofikaciji usled klimatskih promena i opšte prisutnog zagađenja životne sredine. U ovom radu prikazani su rezultati analize kvaliteta vode reke Komarnice, u Crnoj Gori na kojoj se planira izgradnja akumulacione pribranske HE Komarnica. Ključni zaključci istraživanja su: uvesti monitoring (permanentnu kontrolu) kvaliteta vode u jezerima kako bi se što uspešnije kontrolisala i sprečila eutrofikacija. Izuzetno je važno razumeti da ne postoji jedinstvena jednačina ili formula koja bi mogla da važi za monitoring svih jezera. Svako jezero ima svoje jedinstvene karakteristike. Zavisnost hlorofila, koncentracije fosfora i zapremine jezera menja se u zavisnosti od meseca, sezone i godine. Predlog za monitoring kvaliteta vode na jezeru koje će biti izgrađeno na Komarnici, koje predstavlja deo sistema buduće hidroelektrane je mesečno praćenje koncentracije hlorofila, nutrijenata i zapremine jezera.  Sezonsko praćenje zavisi od padavina, hidroloških i limnoloških karakteristika i trendova sušnih i kišnih epizoda. Analize i dosadašnja istraživanja su pokazala da uvođenje obaveznih parametara za praćenje kvaliteta vode ne poskupljuje proizvodnju električne energije i očuvanje energije, a značajno poboljšava i unapređuje kvalitet životne sredine., When planning the construction of a hydroelectric power plant, an important segment is adequate monitoring of water quality. With an appropriate monitoring program, the multifunctional use of artificial lakes is enabled. Eutrophication (nutrient over-enrichment) of water in a lake is a phenomenon that has been noticed in all lakes. The consequence of eutrophication is the endangerment of the aquatic ecosystem. Eutrophication is a phenomenon that occurs as a response of the aquatic ecosystem to the increased concentration of nutrients, phosphorus (P) and nitrogen (N), due to natural and anthropogenic activities. Recent research indicates a correlation between local climate change and water circulation and the impact of climate change on all phenomena in the hydrological cycle. Temperature fluctuations, huge amounts of rain when precipitation is analysed, constant heating and increase in humidity all affect more intense eutrophication. The key conclusions of the research dealing with the construction of the hydroelectric power plant in Komarnica are: to introduce monitoring (permanent control) of water quality in lakes in order to minimize or control, even prevent eutrophication. Each artificial lake has its own unique characteristics. The dependence of chlorophyll, phosphorus and lake volume varies depending on the month, season and year. The proposal for the lake that will be built on Komarnica, which is part of the future hydroelectric power plant, is a monthly monitoring of the concentration of chlorophyll, nutrients and the volume of the lake. Seasonal monitoring depends on precipitation, hydrological and limnological characteristics and trends of dry and rainy episodes. Analyzes and previous research have shown that the introduction of mandatory parameters for monitoring water quality does not increase the cost of electricity production and energy conservation, but significantly improves and enhances the quality of the environment.",
publisher = "Savez energetičara",
journal = "Zbornik radova Energetika 2021 - U susret zelenom oporavku, Zlatibor",
title = "Značaj monitoringa kvaliteta vode u jezerima hidroelektrana, The Significance of Monitoring of Water Quality in Hydropower Lakes",
pages = "206-203",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2464"
}

Rajaković-Ognjanović, V.,& Dašić, T.. (2021). Značaj monitoringa kvaliteta vode u jezerima hidroelektrana. in Zbornik radova Energetika 2021 - U susret zelenom oporavku, Zlatibor
Savez energetičara., 203-206.
https://hdl.handle.net/21.15107/rcub_grafar_2464

Rajaković-Ognjanović V, Dašić T. Značaj monitoringa kvaliteta vode u jezerima hidroelektrana. in Zbornik radova Energetika 2021 - U susret zelenom oporavku, Zlatibor. 2021;:203-206.
https://hdl.handle.net/21.15107/rcub_grafar_2464 .

Rajaković-Ognjanović, Vladana, Dašić, Tina, "Značaj monitoringa kvaliteta vode u jezerima hidroelektrana" in Zbornik radova Energetika 2021 - U susret zelenom oporavku, Zlatibor (2021):203-206,
https://hdl.handle.net/21.15107/rcub_grafar_2464 .

TY  - CONF
AU  - Mirković, Milica
AU  - Petojević, Zorana
AU  - Gospavić, Radovan
AU  - Todorović, Goran
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2989
AB  - In this paper a three dimensional (3D), Computational Fluid Dynamics (CFD) simulation for indoor air flow and heat transfer in a single room was developed. The multi-layer structure building envelop, with expanded polystyrene (EPS) as thermal insulation inside, has been included into simulation and its influence on thermal performances were analysed. The indoor air flow and temperature distribution were analysed for different thicknesses of EPS insulations and were compared to the case without insulation. The commercial software FLUENT has been used in the simulation. The air flow due to natural convection is included into the model through a buoyancy-driven flow. The realizable k- model, based on Reynolds-Averaged Navier-Stokes (RANS) equations, is used for modelling of the turbulence in air flow. The radiator model with thermal flux as input parameter is used for simulation of heating of the room. In order to resolve flow in boundary layer high resolution grid near walls and low-Reynolds number has been used. According to the presented results the thickness of thermal insulation has significant influence on the indoor air flow and the temperature distribution inside the building.
C3  - Proceedings of 3rd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2016, Zlatibor, Serbia, June 13 – 16, 2016
T1  - CFD simulation of thermal performances of building structure with expanded polystyrene (EPS) as thermal insulation
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2989
ER  - 

@conference{
author = "Mirković, Milica and Petojević, Zorana and Gospavić, Radovan and Todorović, Goran",
year = "2016",
abstract = "In this paper a three dimensional (3D), Computational Fluid Dynamics (CFD) simulation for indoor air flow and heat transfer in a single room was developed. The multi-layer structure building envelop, with expanded polystyrene (EPS) as thermal insulation inside, has been included into simulation and its influence on thermal performances were analysed. The indoor air flow and temperature distribution were analysed for different thicknesses of EPS insulations and were compared to the case without insulation. The commercial software FLUENT has been used in the simulation. The air flow due to natural convection is included into the model through a buoyancy-driven flow. The realizable k- model, based on Reynolds-Averaged Navier-Stokes (RANS) equations, is used for modelling of the turbulence in air flow. The radiator model with thermal flux as input parameter is used for simulation of heating of the room. In order to resolve flow in boundary layer high resolution grid near walls and low-Reynolds number has been used. According to the presented results the thickness of thermal insulation has significant influence on the indoor air flow and the temperature distribution inside the building.",
journal = "Proceedings of 3rd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2016, Zlatibor, Serbia, June 13 – 16, 2016",
title = "CFD simulation of thermal performances of building structure with expanded polystyrene (EPS) as thermal insulation",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2989"
}

Mirković, M., Petojević, Z., Gospavić, R.,& Todorović, G.. (2016). CFD simulation of thermal performances of building structure with expanded polystyrene (EPS) as thermal insulation. in Proceedings of 3rd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2016, Zlatibor, Serbia, June 13 – 16, 2016.
https://hdl.handle.net/21.15107/rcub_grafar_2989

Mirković M, Petojević Z, Gospavić R, Todorović G. CFD simulation of thermal performances of building structure with expanded polystyrene (EPS) as thermal insulation. in Proceedings of 3rd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2016, Zlatibor, Serbia, June 13 – 16, 2016. 2016;.
https://hdl.handle.net/21.15107/rcub_grafar_2989 .

Mirković, Milica, Petojević, Zorana, Gospavić, Radovan, Todorović, Goran, "CFD simulation of thermal performances of building structure with expanded polystyrene (EPS) as thermal insulation" in Proceedings of 3rd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2016, Zlatibor, Serbia, June 13 – 16, 2016 (2016),
https://hdl.handle.net/21.15107/rcub_grafar_2989 .