Ristovski, Zoran

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  • Ristovski, Zoran (8)

Author's Bibliography

Modeling indoor particulate matter and small ion concentration relationship-A comparison of a balance equation approach and data driven approach

Davidović, M.; Davidović, M.; Jovanović, Rastko D.; Kolarž, Predrag M.; Jovašević-Stojanović, Milena; Ristovski, Zoran

(2020)

TY  - JOUR
AU  - Davidović, M.
AU  - Davidović, M.
AU  - Jovanović, Rastko D.
AU  - Kolarž, Predrag M.
AU  - Jovašević-Stojanović, Milena
AU  - Ristovski, Zoran
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9621
AB  - In this work we explore the relationship between particulate matter (PM) and small ion (SI) concentration in a typical indoor elementary school environment. A range of important air quality parameters (radon, PM, SI, temperature, humidity) were measured in two elementary schools located in urban background and suburban area in Belgrade city, Serbia. We focus on an interplay between concentrations of radon, small ions (SI) and particulate matter (PM) and for this purpose, we utilize two approaches. The first approach is based on a balance equation which is used to derive approximate relation between concentration of small ions and particulate matter. The form of the obtained relation suggests physics based linear regression modelling. The second approach is more data driven and utilizes machine learning techniques, and in this approach, we develop a more complex statistical model. This paper attempts to put together these two methods into a practical statistical modelling approach that would be more useful than either approach alone. The artificial neural network model enabled prediction of small ion concentration based on radon and particulate matter measurements. Models achieved median absolute error of about 40 ions/cm3 and explained variance of about 0.7. This could potentially enable more simple measurement campaigns, where a smaller number of parameters would be measured, but still allowing for similar insights. © 2020 by the authors.
T2  - Applied Sciences (Switzerland)
T1  - Modeling indoor particulate matter and small ion concentration relationship-A comparison of a balance equation approach and data driven approach
VL  - 10
IS  - 17
DO  - 10.3390/app10175939
ER  - 
@article{
author = "Davidović, M. and Davidović, M. and Jovanović, Rastko D. and Kolarž, Predrag M. and Jovašević-Stojanović, Milena and Ristovski, Zoran",
year = "2020",
abstract = "In this work we explore the relationship between particulate matter (PM) and small ion (SI) concentration in a typical indoor elementary school environment. A range of important air quality parameters (radon, PM, SI, temperature, humidity) were measured in two elementary schools located in urban background and suburban area in Belgrade city, Serbia. We focus on an interplay between concentrations of radon, small ions (SI) and particulate matter (PM) and for this purpose, we utilize two approaches. The first approach is based on a balance equation which is used to derive approximate relation between concentration of small ions and particulate matter. The form of the obtained relation suggests physics based linear regression modelling. The second approach is more data driven and utilizes machine learning techniques, and in this approach, we develop a more complex statistical model. This paper attempts to put together these two methods into a practical statistical modelling approach that would be more useful than either approach alone. The artificial neural network model enabled prediction of small ion concentration based on radon and particulate matter measurements. Models achieved median absolute error of about 40 ions/cm3 and explained variance of about 0.7. This could potentially enable more simple measurement campaigns, where a smaller number of parameters would be measured, but still allowing for similar insights. © 2020 by the authors.",
journal = "Applied Sciences (Switzerland)",
title = "Modeling indoor particulate matter and small ion concentration relationship-A comparison of a balance equation approach and data driven approach",
volume = "10",
number = "17",
doi = "10.3390/app10175939"
}
Davidović, M., Davidović, M., Jovanović, R. D., Kolarž, P. M., Jovašević-Stojanović, M.,& Ristovski, Z.. (2020). Modeling indoor particulate matter and small ion concentration relationship-A comparison of a balance equation approach and data driven approach. in Applied Sciences (Switzerland), 10(17).
https://doi.org/10.3390/app10175939
Davidović M, Davidović M, Jovanović RD, Kolarž PM, Jovašević-Stojanović M, Ristovski Z. Modeling indoor particulate matter and small ion concentration relationship-A comparison of a balance equation approach and data driven approach. in Applied Sciences (Switzerland). 2020;10(17).
doi:10.3390/app10175939 .
Davidović, M., Davidović, M., Jovanović, Rastko D., Kolarž, Predrag M., Jovašević-Stojanović, Milena, Ristovski, Zoran, "Modeling indoor particulate matter and small ion concentration relationship-A comparison of a balance equation approach and data driven approach" in Applied Sciences (Switzerland), 10, no. 17 (2020),
https://doi.org/10.3390/app10175939 . .

In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches

Topalović, Dušan; Davidović, Miloš D.; Jovanović, Maja; Bartonova, Alena; Ristovski, Zoran; Jovašević-Stojanović, Milena

(2019)

TY  - JOUR
AU  - Topalović, Dušan
AU  - Davidović, Miloš D.
AU  - Jovanović, Maja
AU  - Bartonova, Alena
AU  - Ristovski, Zoran
AU  - Jovašević-Stojanović, Milena
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8372
AB  - The current compliance networks of automatic air-quality monitoring stations in large urban environments are not sufficient to provide spatial and temporal measurement resolution for realistic assessment of personal exposure to pollutants. Small low-cost sensor platforms with greater mobility and expected lower maintenance costs, are increasingly being used as a supplement to compliance monitoring stations. However, low-cost sensor platforms usually provide data with uncertain precision. To improve the precision, these sensor platforms require in-field calibration. Our paper aims to demonstrate that data from each individual sensor system can be corrected using that sensor system's own data to achieve much improved data quality compared to a reference. However, in this procedure, there are practical difficulties such as individual sensor outputs from the multi-sensor system not being sufficiently available due to malfunctions for instance. We explore how this can be dealt with. In our opinion, this is a novel approach, of practical importance both to users and manufacturers. We present a detailed comparative analysis of Linear Regression (univariate), Multivariate Linear Regression and Artificial Neural Networks used with a specific aim of calibrating field-deployed low-cost CO and O3 sensors. For Artificial Neural Network models, the performance of three common training algorithms was compared (Levenberg-Marquardt, Resilient back-propagation and Conjugate Gradient Powell-Beale algorithm). Data for this study were obtained from two campaigns conducted with 25 multi-sensor AQMESH v.3.5 platforms used within the activities of the CITI-SENSE project. The platforms were co-located to reference gas monitors at the Automatic Monitoring Station Stari Grad, in Belgrade, Serbia. This paper demonstrates that Multivariate Linear Regression and Artificial Neural Network calibration models can improve the output signal. This improvement can be measured by changes in the median and interquartile ranges of statistical parameters used for model evaluation. Artificial Neural Networks showed the best results compared to Linear Regression and Multivariate Linear Regression models. The best predictors for CO, in addition to CO low-cost sensor data, were PM2.5 and NO2, while for O3, in addition to O3 low-cost sensor data, the most suitable input predictors were NO and aH. Based on residual error analysis, we have shown that for CO and O3, a certain range of concentrations exists in which calibrated values differ by less than 10% from the reference method results. In addition, it was noted that for all models, CO sensors consistently showed lower variability between platforms compared to O3 sensors. © 2019 Elsevier Ltd
T2  - Atmospheric Environment
T1  - In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches
VL  - 213
SP  - 640
EP  - 658
DO  - 10.1016/j.atmosenv.2019.06.028
ER  - 
@article{
author = "Topalović, Dušan and Davidović, Miloš D. and Jovanović, Maja and Bartonova, Alena and Ristovski, Zoran and Jovašević-Stojanović, Milena",
year = "2019",
abstract = "The current compliance networks of automatic air-quality monitoring stations in large urban environments are not sufficient to provide spatial and temporal measurement resolution for realistic assessment of personal exposure to pollutants. Small low-cost sensor platforms with greater mobility and expected lower maintenance costs, are increasingly being used as a supplement to compliance monitoring stations. However, low-cost sensor platforms usually provide data with uncertain precision. To improve the precision, these sensor platforms require in-field calibration. Our paper aims to demonstrate that data from each individual sensor system can be corrected using that sensor system's own data to achieve much improved data quality compared to a reference. However, in this procedure, there are practical difficulties such as individual sensor outputs from the multi-sensor system not being sufficiently available due to malfunctions for instance. We explore how this can be dealt with. In our opinion, this is a novel approach, of practical importance both to users and manufacturers. We present a detailed comparative analysis of Linear Regression (univariate), Multivariate Linear Regression and Artificial Neural Networks used with a specific aim of calibrating field-deployed low-cost CO and O3 sensors. For Artificial Neural Network models, the performance of three common training algorithms was compared (Levenberg-Marquardt, Resilient back-propagation and Conjugate Gradient Powell-Beale algorithm). Data for this study were obtained from two campaigns conducted with 25 multi-sensor AQMESH v.3.5 platforms used within the activities of the CITI-SENSE project. The platforms were co-located to reference gas monitors at the Automatic Monitoring Station Stari Grad, in Belgrade, Serbia. This paper demonstrates that Multivariate Linear Regression and Artificial Neural Network calibration models can improve the output signal. This improvement can be measured by changes in the median and interquartile ranges of statistical parameters used for model evaluation. Artificial Neural Networks showed the best results compared to Linear Regression and Multivariate Linear Regression models. The best predictors for CO, in addition to CO low-cost sensor data, were PM2.5 and NO2, while for O3, in addition to O3 low-cost sensor data, the most suitable input predictors were NO and aH. Based on residual error analysis, we have shown that for CO and O3, a certain range of concentrations exists in which calibrated values differ by less than 10% from the reference method results. In addition, it was noted that for all models, CO sensors consistently showed lower variability between platforms compared to O3 sensors. © 2019 Elsevier Ltd",
journal = "Atmospheric Environment",
title = "In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches",
volume = "213",
pages = "640-658",
doi = "10.1016/j.atmosenv.2019.06.028"
}
Topalović, D., Davidović, M. D., Jovanović, M., Bartonova, A., Ristovski, Z.,& Jovašević-Stojanović, M.. (2019). In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches. in Atmospheric Environment, 213, 640-658.
https://doi.org/10.1016/j.atmosenv.2019.06.028
Topalović D, Davidović MD, Jovanović M, Bartonova A, Ristovski Z, Jovašević-Stojanović M. In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches. in Atmospheric Environment. 2019;213:640-658.
doi:10.1016/j.atmosenv.2019.06.028 .
Topalović, Dušan, Davidović, Miloš D., Jovanović, Maja, Bartonova, Alena, Ristovski, Zoran, Jovašević-Stojanović, Milena, "In search of an optimal in-field calibration method of low-cost gas sensors for ambient air pollutants: Comparison of linear, multilinear and artificial neural network approaches" in Atmospheric Environment, 213 (2019):640-658,
https://doi.org/10.1016/j.atmosenv.2019.06.028 . .
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Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays

Jovanović, Maja; Savić, Jasmina; Salimi, Farhad; Stevanović, Svetlana; Brown, Reece A.; Jovašević-Stojanović, Milena; Manojlovic, Dragan; Bartonova, Alena; Bottle, Steven; Ristovski, Zoran

(2019)

TY  - JOUR
AU  - Jovanović, Maja
AU  - Savić, Jasmina
AU  - Salimi, Farhad
AU  - Stevanović, Svetlana
AU  - Brown, Reece A.
AU  - Jovašević-Stojanović, Milena
AU  - Manojlovic, Dragan
AU  - Bartonova, Alena
AU  - Bottle, Steven
AU  - Ristovski, Zoran
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8677
AB  - To estimate the oxidative potential (OP) of particulate matter (PM), two commonly used cell-free, molecular probes were applied: dithiothreitol (DTT) and dichloro-dihydro-fluorescein diacetate (DCFH-DA), and their performance was compared with 9,10-bis (phenylethynyl) anthracene-nitroxide (BPEAnit). To the best of our knowledge, this is the first study in which the performance of the DTT and DCFH has been compared with the BPEAnit probe. The average concentrations of PM, organic carbon (OC) and elemental carbon (EC) for fine (PM2.5) and coarse (PM10) particles were determined. The results were 44.8 ± 13.7, 9.8 ± 5.1 and 9.3 ± 4.8 µg·m−3 for PM2.5 and 75.5 ± 25.1, 16.3 ± 8.7 and 11.8 ± 5.3 µg·m−3 for PM10, respectively, for PM, OC and EC. The water-soluble organic carbon (WSOC) fraction accounted for 42 ± 14% and 28 ± 9% of organic carbon in PM2.5 and PM10, respectively. The average volume normalized OP values for the three assays depended on both the sampling periods and the PM fractions. The OPBPEAnit had its peak at 2 p.m.; in the afternoon, it was three times higher compared to the morning and late afternoon values. The DCFH and BPEAnit results were correlated (r = 0.64), while there was no good agreement between the BPEAnit and the DTT (r = 0.14). The total organic content of PM does not necessarily represent oxidative capacity and it shows varying correlation with the OP. With respect to the two PM fractions studied, the OP was mostly associated with smaller particles.
T2  - International Journal of Environmental Research and Public Health
T1  - Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays
VL  - 16
IS  - 24
SP  - 4906
DO  - 10.3390/ijerph16244906
ER  - 
@article{
author = "Jovanović, Maja and Savić, Jasmina and Salimi, Farhad and Stevanović, Svetlana and Brown, Reece A. and Jovašević-Stojanović, Milena and Manojlovic, Dragan and Bartonova, Alena and Bottle, Steven and Ristovski, Zoran",
year = "2019",
abstract = "To estimate the oxidative potential (OP) of particulate matter (PM), two commonly used cell-free, molecular probes were applied: dithiothreitol (DTT) and dichloro-dihydro-fluorescein diacetate (DCFH-DA), and their performance was compared with 9,10-bis (phenylethynyl) anthracene-nitroxide (BPEAnit). To the best of our knowledge, this is the first study in which the performance of the DTT and DCFH has been compared with the BPEAnit probe. The average concentrations of PM, organic carbon (OC) and elemental carbon (EC) for fine (PM2.5) and coarse (PM10) particles were determined. The results were 44.8 ± 13.7, 9.8 ± 5.1 and 9.3 ± 4.8 µg·m−3 for PM2.5 and 75.5 ± 25.1, 16.3 ± 8.7 and 11.8 ± 5.3 µg·m−3 for PM10, respectively, for PM, OC and EC. The water-soluble organic carbon (WSOC) fraction accounted for 42 ± 14% and 28 ± 9% of organic carbon in PM2.5 and PM10, respectively. The average volume normalized OP values for the three assays depended on both the sampling periods and the PM fractions. The OPBPEAnit had its peak at 2 p.m.; in the afternoon, it was three times higher compared to the morning and late afternoon values. The DCFH and BPEAnit results were correlated (r = 0.64), while there was no good agreement between the BPEAnit and the DTT (r = 0.14). The total organic content of PM does not necessarily represent oxidative capacity and it shows varying correlation with the OP. With respect to the two PM fractions studied, the OP was mostly associated with smaller particles.",
journal = "International Journal of Environmental Research and Public Health",
title = "Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays",
volume = "16",
number = "24",
pages = "4906",
doi = "10.3390/ijerph16244906"
}
Jovanović, M., Savić, J., Salimi, F., Stevanović, S., Brown, R. A., Jovašević-Stojanović, M., Manojlovic, D., Bartonova, A., Bottle, S.,& Ristovski, Z.. (2019). Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays. in International Journal of Environmental Research and Public Health, 16(24), 4906.
https://doi.org/10.3390/ijerph16244906
Jovanović M, Savić J, Salimi F, Stevanović S, Brown RA, Jovašević-Stojanović M, Manojlovic D, Bartonova A, Bottle S, Ristovski Z. Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays. in International Journal of Environmental Research and Public Health. 2019;16(24):4906.
doi:10.3390/ijerph16244906 .
Jovanović, Maja, Savić, Jasmina, Salimi, Farhad, Stevanović, Svetlana, Brown, Reece A., Jovašević-Stojanović, Milena, Manojlovic, Dragan, Bartonova, Alena, Bottle, Steven, Ristovski, Zoran, "Measurements of Oxidative Potential of Particulate Matter at Belgrade Tunnel; Comparison of BPEAnit, DTT and DCFH Assays" in International Journal of Environmental Research and Public Health, 16, no. 24 (2019):4906,
https://doi.org/10.3390/ijerph16244906 . .
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Concentration and source identification of polycyclic aromatic hydrocarbons in the metropolitan area of Belgrade, Serbia

Cvetković, Anka; Jovašević-Stojanović, Milena; Markovic, Dragan; Ristovski, Zoran

(2015)

TY  - JOUR
AU  - Cvetković, Anka
AU  - Jovašević-Stojanović, Milena
AU  - Markovic, Dragan
AU  - Ristovski, Zoran
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/607
AB  - The aim was to determine concentrations, sources of priority PAHs in PM10 in ambient air and the lifetime lung cancer risk from exposure to PAHs using TEFs at different locations over Belgrade Metropolitan: traffic, rural industrial and suburban industrial. PM10 were collected using LVS on quartz filters in period 2010-2011 and priority PAHs were determine by GC MS. Mean total PAHs concentrations for traffic, rural industrial and suburban industrial locations vary between nonheating and heating seasons from about 5 to 7 and 50-100 ng/m(3), respectively. Source apportionment technique as PMF and diagnostic ratio were applied and 5 emission sources were identified. Locations were under influence of traffic and stationary sources. Particular factor were identified at rural and suburban industrial locations as wood burning, while at suburban industrial site was additionally influenced by coal combustion. Health risk assessment showed that the most negative impact was found at the suburban industrial location. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Atmospheric Environment
T1  - Concentration and source identification of polycyclic aromatic hydrocarbons in the metropolitan area of Belgrade, Serbia
VL  - 112
SP  - 335
EP  - 343
DO  - 10.1016/j.atmosenv.2015.04.034
ER  - 
@article{
author = "Cvetković, Anka and Jovašević-Stojanović, Milena and Markovic, Dragan and Ristovski, Zoran",
year = "2015",
abstract = "The aim was to determine concentrations, sources of priority PAHs in PM10 in ambient air and the lifetime lung cancer risk from exposure to PAHs using TEFs at different locations over Belgrade Metropolitan: traffic, rural industrial and suburban industrial. PM10 were collected using LVS on quartz filters in period 2010-2011 and priority PAHs were determine by GC MS. Mean total PAHs concentrations for traffic, rural industrial and suburban industrial locations vary between nonheating and heating seasons from about 5 to 7 and 50-100 ng/m(3), respectively. Source apportionment technique as PMF and diagnostic ratio were applied and 5 emission sources were identified. Locations were under influence of traffic and stationary sources. Particular factor were identified at rural and suburban industrial locations as wood burning, while at suburban industrial site was additionally influenced by coal combustion. Health risk assessment showed that the most negative impact was found at the suburban industrial location. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Atmospheric Environment",
title = "Concentration and source identification of polycyclic aromatic hydrocarbons in the metropolitan area of Belgrade, Serbia",
volume = "112",
pages = "335-343",
doi = "10.1016/j.atmosenv.2015.04.034"
}
Cvetković, A., Jovašević-Stojanović, M., Markovic, D.,& Ristovski, Z.. (2015). Concentration and source identification of polycyclic aromatic hydrocarbons in the metropolitan area of Belgrade, Serbia. in Atmospheric Environment, 112, 335-343.
https://doi.org/10.1016/j.atmosenv.2015.04.034
Cvetković A, Jovašević-Stojanović M, Markovic D, Ristovski Z. Concentration and source identification of polycyclic aromatic hydrocarbons in the metropolitan area of Belgrade, Serbia. in Atmospheric Environment. 2015;112:335-343.
doi:10.1016/j.atmosenv.2015.04.034 .
Cvetković, Anka, Jovašević-Stojanović, Milena, Markovic, Dragan, Ristovski, Zoran, "Concentration and source identification of polycyclic aromatic hydrocarbons in the metropolitan area of Belgrade, Serbia" in Atmospheric Environment, 112 (2015):335-343,
https://doi.org/10.1016/j.atmosenv.2015.04.034 . .
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On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter

Jovašević-Stojanović, Milena; Bartonova, Alena; Topalović, Dušan; Lazović, Ivan; Pokrić, Boris; Ristovski, Zoran

(Elsevier, 2015)

TY  - JOUR
AU  - Jovašević-Stojanović, Milena
AU  - Bartonova, Alena
AU  - Topalović, Dušan
AU  - Lazović, Ivan
AU  - Pokrić, Boris
AU  - Ristovski, Zoran
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/851
AB  - Respirable particulate matter present in outdoor and indoor environments is a health hazard. The particle concentrations can quickly change, with steep gradients on short temporal and spatial scales, and their chemical composition and physical properties vary considerably. Existing networks of aerosol particle measurements consist of limited number of monitoring stations, and mostly aim at assessment of compliance with air quality legislation regulating mass of particles of varying sizes. These networks can now be supplemented using small portable devices with low-cost sensors for assessment of particle mass that may provide higher temporal and spatial resolution if we understand the capabilities and characteristics of the data they provide. This paper overviews typical currently available devices and their characteristics. In addition it is presented original results of measurement and modelling in the aim of one low-cost PM monitor validation. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Environmental Pollution
T1  - On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter
VL  - 206
SP  - 696
EP  - 704
DO  - 10.1016/j.envpol.2015.08.035
ER  - 
@article{
author = "Jovašević-Stojanović, Milena and Bartonova, Alena and Topalović, Dušan and Lazović, Ivan and Pokrić, Boris and Ristovski, Zoran",
year = "2015",
abstract = "Respirable particulate matter present in outdoor and indoor environments is a health hazard. The particle concentrations can quickly change, with steep gradients on short temporal and spatial scales, and their chemical composition and physical properties vary considerably. Existing networks of aerosol particle measurements consist of limited number of monitoring stations, and mostly aim at assessment of compliance with air quality legislation regulating mass of particles of varying sizes. These networks can now be supplemented using small portable devices with low-cost sensors for assessment of particle mass that may provide higher temporal and spatial resolution if we understand the capabilities and characteristics of the data they provide. This paper overviews typical currently available devices and their characteristics. In addition it is presented original results of measurement and modelling in the aim of one low-cost PM monitor validation. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Environmental Pollution",
title = "On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter",
volume = "206",
pages = "696-704",
doi = "10.1016/j.envpol.2015.08.035"
}
Jovašević-Stojanović, M., Bartonova, A., Topalović, D., Lazović, I., Pokrić, B.,& Ristovski, Z.. (2015). On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter. in Environmental Pollution
Elsevier., 206, 696-704.
https://doi.org/10.1016/j.envpol.2015.08.035
Jovašević-Stojanović M, Bartonova A, Topalović D, Lazović I, Pokrić B, Ristovski Z. On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter. in Environmental Pollution. 2015;206:696-704.
doi:10.1016/j.envpol.2015.08.035 .
Jovašević-Stojanović, Milena, Bartonova, Alena, Topalović, Dušan, Lazović, Ivan, Pokrić, Boris, Ristovski, Zoran, "On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter" in Environmental Pollution, 206 (2015):696-704,
https://doi.org/10.1016/j.envpol.2015.08.035 . .
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86

Conduction of heat in inhomogeneous solids

Dramićanin, Miroslav; Ristovski, Zoran; Đoković, Vladimir; Galović, Slobodanka

(1998)

TY  - JOUR
AU  - Dramićanin, Miroslav
AU  - Ristovski, Zoran
AU  - Đoković, Vladimir
AU  - Galović, Slobodanka
PY  - 1998
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2164
AB  - In this letter we present a method for calculation of linear heat flow in inhomogeneous solids. The method is based on the evaluation of transfer matrices for each layer in a multilayered structure from the Laplace transformation of the partial differential equation of heat conduction. The multilayered structure is then described by a matrix obtained as a chain of products of individual layer transfer matrices and corresponding boundary thermal resistivity matrices. The analytic expression for the nth power of the multilayered transfer matrix is found, describing a periodic multilayered structure composed of It equal multilayered structures. The application of the presented method for calculation of photothermal signals is also shown. Dispersion relation for the thermal waves in inhomogeneous solids is obtained from the matrix elements of the transfer matrix. Finally, from the dispersion relation explicit expressions for the effective values of thermal diffusivity and conductivity of both the discontinuously and continuously inhomogeneous solids are evaluated. (C) 1998 American Institute of Physics.
T2  - Applied Physics Letters
T1  - Conduction of heat in inhomogeneous solids
VL  - 73
IS  - 3
SP  - 321
EP  - 323
ER  - 
@article{
author = "Dramićanin, Miroslav and Ristovski, Zoran and Đoković, Vladimir and Galović, Slobodanka",
year = "1998",
abstract = "In this letter we present a method for calculation of linear heat flow in inhomogeneous solids. The method is based on the evaluation of transfer matrices for each layer in a multilayered structure from the Laplace transformation of the partial differential equation of heat conduction. The multilayered structure is then described by a matrix obtained as a chain of products of individual layer transfer matrices and corresponding boundary thermal resistivity matrices. The analytic expression for the nth power of the multilayered transfer matrix is found, describing a periodic multilayered structure composed of It equal multilayered structures. The application of the presented method for calculation of photothermal signals is also shown. Dispersion relation for the thermal waves in inhomogeneous solids is obtained from the matrix elements of the transfer matrix. Finally, from the dispersion relation explicit expressions for the effective values of thermal diffusivity and conductivity of both the discontinuously and continuously inhomogeneous solids are evaluated. (C) 1998 American Institute of Physics.",
journal = "Applied Physics Letters",
title = "Conduction of heat in inhomogeneous solids",
volume = "73",
number = "3",
pages = "321-323"
}
Dramićanin, M., Ristovski, Z., Đoković, V.,& Galović, S.. (1998). Conduction of heat in inhomogeneous solids. in Applied Physics Letters, 73(3), 321-323.
Dramićanin M, Ristovski Z, Đoković V, Galović S. Conduction of heat in inhomogeneous solids. in Applied Physics Letters. 1998;73(3):321-323..
Dramićanin, Miroslav, Ristovski, Zoran, Đoković, Vladimir, Galović, Slobodanka, "Conduction of heat in inhomogeneous solids" in Applied Physics Letters, 73, no. 3 (1998):321-323.
22

Photoacoustic measurement of internal quantum efficiency and observation of the exciton effect in GaSe with photoacoustic phase spectra

Ristovski, Zoran; Dramićanin, Miroslav

(1997)

TY  - JOUR
AU  - Ristovski, Zoran
AU  - Dramićanin, Miroslav
PY  - 1997
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2048
AB  - We studied the room temperature photoacoustic spectra of GaSe single crystals in the vicinity of the energy gap. Exciton formation was observed in both amplitude and phase spectra. The thermal source that arises in the illuminated sample because of optical absorption without free-carrier generation was incorporated in the heat diffusion equation in order to extend the theoretical approach of photoacoustic signal generation. We calculated the optical absorption coefficient, which shows the exciton formation, and the electron-hole generation quantum efficiency eta(G) using an extended model from the phase and amplitude photoacoustic spectra, respectively. (C) 1997 Optical Society of America
T2  - Applied Optics
T1  - Photoacoustic measurement of internal quantum efficiency and observation of the exciton effect in GaSe with photoacoustic phase spectra
VL  - 36
IS  - 3
SP  - 648
EP  - 654
DO  - 10.1364/AO.36.000648
ER  - 
@article{
author = "Ristovski, Zoran and Dramićanin, Miroslav",
year = "1997",
abstract = "We studied the room temperature photoacoustic spectra of GaSe single crystals in the vicinity of the energy gap. Exciton formation was observed in both amplitude and phase spectra. The thermal source that arises in the illuminated sample because of optical absorption without free-carrier generation was incorporated in the heat diffusion equation in order to extend the theoretical approach of photoacoustic signal generation. We calculated the optical absorption coefficient, which shows the exciton formation, and the electron-hole generation quantum efficiency eta(G) using an extended model from the phase and amplitude photoacoustic spectra, respectively. (C) 1997 Optical Society of America",
journal = "Applied Optics",
title = "Photoacoustic measurement of internal quantum efficiency and observation of the exciton effect in GaSe with photoacoustic phase spectra",
volume = "36",
number = "3",
pages = "648-654",
doi = "10.1364/AO.36.000648"
}
Ristovski, Z.,& Dramićanin, M.. (1997). Photoacoustic measurement of internal quantum efficiency and observation of the exciton effect in GaSe with photoacoustic phase spectra. in Applied Optics, 36(3), 648-654.
https://doi.org/10.1364/AO.36.000648
Ristovski Z, Dramićanin M. Photoacoustic measurement of internal quantum efficiency and observation of the exciton effect in GaSe with photoacoustic phase spectra. in Applied Optics. 1997;36(3):648-654.
doi:10.1364/AO.36.000648 .
Ristovski, Zoran, Dramićanin, Miroslav, "Photoacoustic measurement of internal quantum efficiency and observation of the exciton effect in GaSe with photoacoustic phase spectra" in Applied Optics, 36, no. 3 (1997):648-654,
https://doi.org/10.1364/AO.36.000648 . .
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Photoacoustic investigation of transport in semiconductors: Theoretical and experimental study of a Ge single crystal

Dramićanin, Miroslav; Ristovski, Zoran; Nikolić, Pantelija; Vasiljević, D.; Todorović, Dragana

(The American Physical Society, 1995)

TY  - JOUR
AU  - Dramićanin, Miroslav
AU  - Ristovski, Zoran
AU  - Nikolić, Pantelija
AU  - Vasiljević, D.
AU  - Todorović, Dragana
PY  - 1995
UR  - http://dais.sanu.ac.rs/123456789/569
UR  - http://www.itn.sanu.ac.rs/opus4/frontdoor/index/index/docId/837
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7480
AB  - Photoacoustic (PA) heat-transmission measurements were used to study transport in a nearly intrinsic Ge single crystal. A theoretical model was developed which quantitatively describes excess carrier and thermal-wave space distributions, within the semiconductor under monochromatic cw modulated excitation. The PA heat-transmission, reflection, and photothermal-beam-deflection signals can be calculated using this model. It is shown that the frequency characteristic of the measurement system can be eliminated using measurements on different thicknesses of the same sample. It is also shown that both the normalized phase and amplitude spectra, as a function of the modulation frequency, can be used to determine the values of the thermal diffusivity, the excess-carrier lifetime, and the surface recombination velocity.
PB  - The American Physical Society
T2  - Physical Review B
T1  - Photoacoustic investigation of transport in semiconductors: Theoretical and experimental study of a Ge single crystal
SP  - 14226
EP  - 14232
DO  - 10.1103/PhysRevB.51.14226
ER  - 
@article{
author = "Dramićanin, Miroslav and Ristovski, Zoran and Nikolić, Pantelija and Vasiljević, D. and Todorović, Dragana",
year = "1995",
abstract = "Photoacoustic (PA) heat-transmission measurements were used to study transport in a nearly intrinsic Ge single crystal. A theoretical model was developed which quantitatively describes excess carrier and thermal-wave space distributions, within the semiconductor under monochromatic cw modulated excitation. The PA heat-transmission, reflection, and photothermal-beam-deflection signals can be calculated using this model. It is shown that the frequency characteristic of the measurement system can be eliminated using measurements on different thicknesses of the same sample. It is also shown that both the normalized phase and amplitude spectra, as a function of the modulation frequency, can be used to determine the values of the thermal diffusivity, the excess-carrier lifetime, and the surface recombination velocity.",
publisher = "The American Physical Society",
journal = "Physical Review B",
title = "Photoacoustic investigation of transport in semiconductors: Theoretical and experimental study of a Ge single crystal",
pages = "14226-14232",
doi = "10.1103/PhysRevB.51.14226"
}
Dramićanin, M., Ristovski, Z., Nikolić, P., Vasiljević, D.,& Todorović, D.. (1995). Photoacoustic investigation of transport in semiconductors: Theoretical and experimental study of a Ge single crystal. in Physical Review B
The American Physical Society., 14226-14232.
https://doi.org/10.1103/PhysRevB.51.14226
Dramićanin M, Ristovski Z, Nikolić P, Vasiljević D, Todorović D. Photoacoustic investigation of transport in semiconductors: Theoretical and experimental study of a Ge single crystal. in Physical Review B. 1995;:14226-14232.
doi:10.1103/PhysRevB.51.14226 .
Dramićanin, Miroslav, Ristovski, Zoran, Nikolić, Pantelija, Vasiljević, D., Todorović, Dragana, "Photoacoustic investigation of transport in semiconductors: Theoretical and experimental study of a Ge single crystal" in Physical Review B (1995):14226-14232,
https://doi.org/10.1103/PhysRevB.51.14226 . .
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