TY  - CONF
AU  - Zorko, Benjamin
AU  - Ajtić, Jelena
AU  - Nečemer, Marijan
AU  - Sarvan, Darko
AU  - Rajačić, Milica
AU  - Korun, Matjaž
AU  - Vodenik, Branko
AU  - Krneta Nikolić, Jelena
AU  - Glavič-Cindro, Denis
AU  - Vukanac, Ivana
AU  - Petrovič, Toni
AU  - Ilić, Zorana
AU  - Vidic, alf
AU  - Didović, Irma
AU  - Janušeski, Jovan
AU  - Anuševa, Jordanka
AU  - Dimovska, Snezana
AU  - Danilovski, Dejan
AU  - Anđelić, Tomislav
AU  - Zekić, Ranko
AU  - Svrkota, Nikola
AU  - Radonjić, Slavko
AU  - Petrinec, Branko
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3271
AB  - Mjerenja koncentracije aktivnosti radionuklida Be-7 (berilij-7), Pb-210 (olovo
210) i Cs-137 (cezij-137) u Zemljinoj atmosferi neophodna su za razumijevanje
atmosferskih procesa, kvalitete zraka i radioaktivnosti okoliša. Berilij-7 je
radioaktivni izotop koji prvenstveno nastaje interakcijom kozmičkih zraka s
atomima dušika i kisika u gornjoj atmosferi. Njegov kratki poluživot čini ga
vrijednim tragačem za atmosferske procese u relativno kratkim vremenskim
razdobljima. Olovo-210 je radioaktivni izotop čiji je primarni izvor u atmosferi
raspad plina radona. S dužim poluživotom od Be-7, pogodan je za proučavanje
dugotrajnijih atmosferskih procesa. Cezij-137 je, s druge strane, antropogeni
radioizotop s vremenom poluraspada čak i dužim od onog Pb-210, što ga
čini dobrim dugoročnim ekološkim tragačem. Nedavno je uspostavljena baza
podataka za praćenje radioaktivnosti tla u zraku (GRAMON). Sadrži rezultate mjerenja radioaktivnosti u površinskom zraku na sedam lokacija: Beograd (Srbija),
Ljubljana i Krško (Slovenija), Sarajevo (Bosna i Hercegovina), Podgorica (Crna
Gora), Skopje i Bitola (Sjeverna Makedonija). Naš rad daje statističku analizu
mjesečnih (prosječnih) vrijednosti koncentracija aktivnosti radionuklida za svaku
lokaciju od 2010. do 2019. Rezultati pokazuju prostorne razlike i vremensku
evoluciju radioaktivnosti zraka u ovoj regiji koja je obično nedovoljno zastupljena
u velikim studijama.
AB  - Measurements of activity concentrations of radionuclides Be-7 (beryllium-7), Pb210 (lead210), and Cs-137 (cesium-137) in the Earth’s atmosphere are essential for
understanding atmospheric processes, air quality, and environmental radioactivity.
Beryllium-7 is a radioactive isotope produced primarily by cosmic ray interactions
with nitrogen and oxygen atoms in the upper atmosphere. Its short half-life makes
it a valuable tracer for atmospheric processes on relatively short timescales. Lead210 is a radioactive isotope whose primary source in the atmosphere is decay
of radon gas. With a longer half-life than Be-7, it is suitable for studying longerterm atmospheric processes. Cesium-137, on the other hand, is an anthropogenic
radioisotope with a half-life even longer than that of Pb-210, which makes it a good
long-term environmental tracer.
The Ground Air Radioactivity Monitoring (GRAMON) database has been recently
established. It contains the outcomes of radioactivity measurements in the surface air at seven locations: Belgrade (Serbia), Ljubljana and Krško (Slovenia),
Sarajevo (Bosnia and Herzegovina), Podgorica (Montenegro), Skopje and Bitola
(North Macedonia). Our paper gives a statistical analysis of monthly (average)
values of the radionuclides’ activity concentrations for each location from 2010
to 2019. The results demonstrate spatial differences and temporal evolution of air
radioactivity over this region commonly underrepresented in large-scale studies.
PB  - Bilje : Javna ustanova „Park prirode Kopački rit“
C3  - 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.
T1  - Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi
T1  - Measurements of Be-7, Pb-210 and Cs-137 activity concentrations in the surface atmosphere
SP  - 250
EP  - 253
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3271
ER  - 

@conference{
author = "Zorko, Benjamin and Ajtić, Jelena and Nečemer, Marijan and Sarvan, Darko and Rajačić, Milica and Korun, Matjaž and Vodenik, Branko and Krneta Nikolić, Jelena and Glavič-Cindro, Denis and Vukanac, Ivana and Petrovič, Toni and Ilić, Zorana and Vidic, alf and Didović, Irma and Janušeski, Jovan and Anuševa, Jordanka and Dimovska, Snezana and Danilovski, Dejan and Anđelić, Tomislav and Zekić, Ranko and Svrkota, Nikola and Radonjić, Slavko and Petrinec, Branko",
year = "2023",
abstract = "Mjerenja koncentracije aktivnosti radionuklida Be-7 (berilij-7), Pb-210 (olovo
210) i Cs-137 (cezij-137) u Zemljinoj atmosferi neophodna su za razumijevanje
atmosferskih procesa, kvalitete zraka i radioaktivnosti okoliša. Berilij-7 je
radioaktivni izotop koji prvenstveno nastaje interakcijom kozmičkih zraka s
atomima dušika i kisika u gornjoj atmosferi. Njegov kratki poluživot čini ga
vrijednim tragačem za atmosferske procese u relativno kratkim vremenskim
razdobljima. Olovo-210 je radioaktivni izotop čiji je primarni izvor u atmosferi
raspad plina radona. S dužim poluživotom od Be-7, pogodan je za proučavanje
dugotrajnijih atmosferskih procesa. Cezij-137 je, s druge strane, antropogeni
radioizotop s vremenom poluraspada čak i dužim od onog Pb-210, što ga
čini dobrim dugoročnim ekološkim tragačem. Nedavno je uspostavljena baza
podataka za praćenje radioaktivnosti tla u zraku (GRAMON). Sadrži rezultate mjerenja radioaktivnosti u površinskom zraku na sedam lokacija: Beograd (Srbija),
Ljubljana i Krško (Slovenija), Sarajevo (Bosna i Hercegovina), Podgorica (Crna
Gora), Skopje i Bitola (Sjeverna Makedonija). Naš rad daje statističku analizu
mjesečnih (prosječnih) vrijednosti koncentracija aktivnosti radionuklida za svaku
lokaciju od 2010. do 2019. Rezultati pokazuju prostorne razlike i vremensku
evoluciju radioaktivnosti zraka u ovoj regiji koja je obično nedovoljno zastupljena
u velikim studijama., Measurements of activity concentrations of radionuclides Be-7 (beryllium-7), Pb210 (lead210), and Cs-137 (cesium-137) in the Earth’s atmosphere are essential for
understanding atmospheric processes, air quality, and environmental radioactivity.
Beryllium-7 is a radioactive isotope produced primarily by cosmic ray interactions
with nitrogen and oxygen atoms in the upper atmosphere. Its short half-life makes
it a valuable tracer for atmospheric processes on relatively short timescales. Lead210 is a radioactive isotope whose primary source in the atmosphere is decay
of radon gas. With a longer half-life than Be-7, it is suitable for studying longerterm atmospheric processes. Cesium-137, on the other hand, is an anthropogenic
radioisotope with a half-life even longer than that of Pb-210, which makes it a good
long-term environmental tracer.
The Ground Air Radioactivity Monitoring (GRAMON) database has been recently
established. It contains the outcomes of radioactivity measurements in the surface air at seven locations: Belgrade (Serbia), Ljubljana and Krško (Slovenia),
Sarajevo (Bosnia and Herzegovina), Podgorica (Montenegro), Skopje and Bitola
(North Macedonia). Our paper gives a statistical analysis of monthly (average)
values of the radionuclides’ activity concentrations for each location from 2010
to 2019. The results demonstrate spatial differences and temporal evolution of air
radioactivity over this region commonly underrepresented in large-scale studies.",
publisher = "Bilje : Javna ustanova „Park prirode Kopački rit“",
journal = "12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.",
title = "Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi, Measurements of Be-7, Pb-210 and Cs-137 activity concentrations in the surface atmosphere",
pages = "250-253",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3271"
}

Zorko, B., Ajtić, J., Nečemer, M., Sarvan, D., Rajačić, M., Korun, M., Vodenik, B., Krneta Nikolić, J., Glavič-Cindro, D., Vukanac, I., Petrovič, T., Ilić, Z., Vidic, a., Didović, I., Janušeski, J., Anuševa, J., Dimovska, S., Danilovski, D., Anđelić, T., Zekić, R., Svrkota, N., Radonjić, S.,& Petrinec, B.. (2023). Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi. in 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.
Bilje : Javna ustanova „Park prirode Kopački rit“., 250-253.
https://hdl.handle.net/21.15107/rcub_veterinar_3271

Zorko B, Ajtić J, Nečemer M, Sarvan D, Rajačić M, Korun M, Vodenik B, Krneta Nikolić J, Glavič-Cindro D, Vukanac I, Petrovič T, Ilić Z, Vidic A, Didović I, Janušeski J, Anuševa J, Dimovska S, Danilovski D, Anđelić T, Zekić R, Svrkota N, Radonjić S, Petrinec B. Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi. in 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023.. 2023;:250-253.
https://hdl.handle.net/21.15107/rcub_veterinar_3271 .

Zorko, Benjamin, Ajtić, Jelena, Nečemer, Marijan, Sarvan, Darko, Rajačić, Milica, Korun, Matjaž, Vodenik, Branko, Krneta Nikolić, Jelena, Glavič-Cindro, Denis, Vukanac, Ivana, Petrovič, Toni, Ilić, Zorana, Vidic, alf, Didović, Irma, Janušeski, Jovan, Anuševa, Jordanka, Dimovska, Snezana, Danilovski, Dejan, Anđelić, Tomislav, Zekić, Ranko, Svrkota, Nikola, Radonjić, Slavko, Petrinec, Branko, "Mjerenje koncentracija aktivnosti Be-7, Pb-210 i Cs-137 u površinskoj atmosferi" in 12. simpozija s međunarodnim sudjelovanjem KOPAČKI RIT / jučer, danas, sutra / 2023, Osijek, 28. – 29. rujna 2023. (2023):250-253,
https://hdl.handle.net/21.15107/rcub_veterinar_3271 .

TY  - CONF
AU  - Sarvan, Darko
AU  - Stratimirović, Đorđe
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Vukanac, Ivana
AU  - Ajtić, Jelena
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3270
AB  - U ovom istraživanju analizirana je fraktalna priroda vremenske serije specifične aktivnosti berilijuma-7 u površinskom sloju atmosfere u Beogradu, Srbija, sa ciljem da se prouči dinamika njene samosličnosti, a s posebnim fokusom na godišnji ciklus. Korišćene su metode vejvlet analize i vremenski zavisne detrendovane pokretne srednje vrednosti radi identifikacije karakterističnih intervala i procene Hurstovih eksponenata.
Podaci o specifičnoj aktivnosti berilijuma-7 preuzeti su iz GRAMON baze podataka, za lokaciju Beograd (44,88 °N; 20,58 °E; 95 m nadmorske visine). Vremenska serija obuhvata 362 mesečna merenja od 1991. do 2022. godine.
Rezultati ukazuju na postojanje izraženog godišnjeg ciklusa u ovoj vremenskoj seriji. Takođe, promene u lokalnom Hurstovom eksponentu otkrivaju varijacije u ponašanju vremenske serije – ona iz umereno korelisanog prelazi u izrazito antikorelisan proces između 2015. i 2020. godine.
Ovaj rezultat biće predmet šire analize koja uključuje i druge lokacije iz GRAMON baze podataka.
PB  - Institut za nuklearne nauke "Vinča"
PB  - Društvo za zaštitu od zračenja Srbije i Crne Gore
C3  - XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023
T1  - Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022)
SP  - 122
EP  - 127
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3270
ER  - 

@conference{
author = "Sarvan, Darko and Stratimirović, Đorđe and Rajačić, Milica and Krneta Nikolić, Jelena and Vukanac, Ivana and Ajtić, Jelena",
year = "2023",
abstract = "U ovom istraživanju analizirana je fraktalna priroda vremenske serije specifične aktivnosti berilijuma-7 u površinskom sloju atmosfere u Beogradu, Srbija, sa ciljem da se prouči dinamika njene samosličnosti, a s posebnim fokusom na godišnji ciklus. Korišćene su metode vejvlet analize i vremenski zavisne detrendovane pokretne srednje vrednosti radi identifikacije karakterističnih intervala i procene Hurstovih eksponenata.
Podaci o specifičnoj aktivnosti berilijuma-7 preuzeti su iz GRAMON baze podataka, za lokaciju Beograd (44,88 °N; 20,58 °E; 95 m nadmorske visine). Vremenska serija obuhvata 362 mesečna merenja od 1991. do 2022. godine.
Rezultati ukazuju na postojanje izraženog godišnjeg ciklusa u ovoj vremenskoj seriji. Takođe, promene u lokalnom Hurstovom eksponentu otkrivaju varijacije u ponašanju vremenske serije – ona iz umereno korelisanog prelazi u izrazito antikorelisan proces između 2015. i 2020. godine.
Ovaj rezultat biće predmet šire analize koja uključuje i druge lokacije iz GRAMON baze podataka.",
publisher = "Institut za nuklearne nauke "Vinča", Društvo za zaštitu od zračenja Srbije i Crne Gore",
journal = "XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023",
title = "Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022)",
pages = "122-127",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3270"
}

Sarvan, D., Stratimirović, Đ., Rajačić, M., Krneta Nikolić, J., Vukanac, I.,& Ajtić, J.. (2023). Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022). in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023
Institut za nuklearne nauke "Vinča"., 122-127.
https://hdl.handle.net/21.15107/rcub_veterinar_3270

Sarvan D, Stratimirović Đ, Rajačić M, Krneta Nikolić J, Vukanac I, Ajtić J. Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022). in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023. 2023;:122-127.
https://hdl.handle.net/21.15107/rcub_veterinar_3270 .

Sarvan, Darko, Stratimirović, Đorđe, Rajačić, Milica, Krneta Nikolić, Jelena, Vukanac, Ivana, Ajtić, Jelena, "Analiza fraktalne prirode specifične aktivnosti berilijuma-7 u prizemnom sloju atmosfere merene u Beogradu, Srbija (1991-2022)" in XXXII Simpozijum Društva za zaštitu od zračenja Srbije i Crne Gore, Budva, 4 - 6. oktobar 2023 (2023):122-127,
https://hdl.handle.net/21.15107/rcub_veterinar_3270 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Vukanac, Ivana
AU  - Ilić, Zorana
AU  - Vidic, Alfred
AU  - Didović, Irma
AU  - Janušeski, Jovan
AU  - Anusheva, Jordanka
AU  - Dimovska, Snezana
AU  - Danilovski, Dejan
AU  - Anđelić, Tomislav
AU  - Zekić, Ranko
AU  - Svrkota, Nikola
AU  - Radonjić, Slavko
AU  - Vodenik, Branko
AU  - Zorko, Benjamin
PY  - 2023
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/3003
AB  - Ground Air Radioactivity Monitoring (GRAMON) database is a recently established collection containing activity concentrations of gamma emitters in aerosol samples. The measurements come
from Serbia (sampling site Belgrade), Slovenia (sampling sites Ljubljana and Krško), Bosnia and
Herzegovina (sampling site Sarajevo), Montenegro (sampling site Podgorica), and North Macedonia (sampling sites Skopje and Bitola), thus covering the northern and central parts of the Balkan Peninsula.
As a database arising from the monitoring programmes in several countries, GRAMON is not
fully homogeneous in terms of the radionuclides and time periods studied. For example, the
beryllium-7 records are available for all sampling sites, while the lead-210 records only in Serbia,
Slovenia, and Bosnia and Herzegovina. The time series for Serbia and Slovenia began in 1991, for
Montenegro and North Macedonia in 2008, and for Bosnia and Herzegovina in 2010.
However, sampling, sample preparation, and measurement procedures across the sites and
laboratories are similar. In brief, aerosol samples are collected on filter papers using air samplers.
Activity concentrations of radionuclides are determined by standard gamma spectrometry using
high-purity germanium detectors. The time series contain monthly mean activity concentrations.
Since only some of the GRAMON records have been previously published, this database provides
a source for radioactivity research in the region that has been underrepresented in large-scale
studies. We further hope to expand the number of contributing laboratories and cover a wider region of Europe, especially its southern and eastern parts.
PB  - Niš : Sievert Association
C3  - International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023
T1  - Introducing a regional database of radioactivity in the air – GRAMON
SP  - 91
EP  - 91
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_3003
ER  - 

@conference{
author = "Ajtić, Jelena and Sarvan, Darko and Rajačić, Milica and Krneta Nikolić, Jelena and Vukanac, Ivana and Ilić, Zorana and Vidic, Alfred and Didović, Irma and Janušeski, Jovan and Anusheva, Jordanka and Dimovska, Snezana and Danilovski, Dejan and Anđelić, Tomislav and Zekić, Ranko and Svrkota, Nikola and Radonjić, Slavko and Vodenik, Branko and Zorko, Benjamin",
year = "2023",
abstract = "Ground Air Radioactivity Monitoring (GRAMON) database is a recently established collection containing activity concentrations of gamma emitters in aerosol samples. The measurements come
from Serbia (sampling site Belgrade), Slovenia (sampling sites Ljubljana and Krško), Bosnia and
Herzegovina (sampling site Sarajevo), Montenegro (sampling site Podgorica), and North Macedonia (sampling sites Skopje and Bitola), thus covering the northern and central parts of the Balkan Peninsula.
As a database arising from the monitoring programmes in several countries, GRAMON is not
fully homogeneous in terms of the radionuclides and time periods studied. For example, the
beryllium-7 records are available for all sampling sites, while the lead-210 records only in Serbia,
Slovenia, and Bosnia and Herzegovina. The time series for Serbia and Slovenia began in 1991, for
Montenegro and North Macedonia in 2008, and for Bosnia and Herzegovina in 2010.
However, sampling, sample preparation, and measurement procedures across the sites and
laboratories are similar. In brief, aerosol samples are collected on filter papers using air samplers.
Activity concentrations of radionuclides are determined by standard gamma spectrometry using
high-purity germanium detectors. The time series contain monthly mean activity concentrations.
Since only some of the GRAMON records have been previously published, this database provides
a source for radioactivity research in the region that has been underrepresented in large-scale
studies. We further hope to expand the number of contributing laboratories and cover a wider region of Europe, especially its southern and eastern parts.",
publisher = "Niš : Sievert Association",
journal = "International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023",
title = "Introducing a regional database of radioactivity in the air – GRAMON",
pages = "91-91",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_3003"
}

Ajtić, J., Sarvan, D., Rajačić, M., Krneta Nikolić, J., Vukanac, I., Ilić, Z., Vidic, A., Didović, I., Janušeski, J., Anusheva, J., Dimovska, S., Danilovski, D., Anđelić, T., Zekić, R., Svrkota, N., Radonjić, S., Vodenik, B.,& Zorko, B.. (2023). Introducing a regional database of radioactivity in the air – GRAMON. in International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023
Niš : Sievert Association., 91-91.
https://hdl.handle.net/21.15107/rcub_veterinar_3003

Ajtić J, Sarvan D, Rajačić M, Krneta Nikolić J, Vukanac I, Ilić Z, Vidic A, Didović I, Janušeski J, Anusheva J, Dimovska S, Danilovski D, Anđelić T, Zekić R, Svrkota N, Radonjić S, Vodenik B, Zorko B. Introducing a regional database of radioactivity in the air – GRAMON. in International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023. 2023;:91-91.
https://hdl.handle.net/21.15107/rcub_veterinar_3003 .

Ajtić, Jelena, Sarvan, Darko, Rajačić, Milica, Krneta Nikolić, Jelena, Vukanac, Ivana, Ilić, Zorana, Vidic, Alfred, Didović, Irma, Janušeski, Jovan, Anusheva, Jordanka, Dimovska, Snezana, Danilovski, Dejan, Anđelić, Tomislav, Zekić, Ranko, Svrkota, Nikola, Radonjić, Slavko, Vodenik, Branko, Zorko, Benjamin, "Introducing a regional database of radioactivity in the air – GRAMON" in International Conference on Radiation Applications RAP, Anavyssos, May 29 - June 2, 2023 (2023):91-91,
https://hdl.handle.net/21.15107/rcub_veterinar_3003 .

TY  - CONF
AU  - Janjić, Filip
AU  - Sarvan, Darko
AU  - Tomanović, Snežana
AU  - Krstić, Vanja
AU  - Radonjić, Vladimir
AU  - Kovačević-Filipović, Milica
AU  - Ajtić, Jelena
PY  - 2022
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2487
AB  - Background: Canine babesiosis, a tick-borne disease caused by Babesia canis,
shows a seasonality whose relationship with local weather conditions has not been
fully investigated. Objectives: Meteorological conditions can favour the tick-vector
activity, and thus lead to an increased number of cases of canine babesiosis. Hence,
our study looks into the link between the number of recorded cases, on the one
hand, and temperature and relative humidity on the other with an aim to quantify
their correlations. Material and Methods: Over 2013–2016, the data were
collected in Belgrade, the capital of the Republic of Serbia. The meteorological
parameters were obtained from the Republic Hydrometeorological Service of
Serbia. The analysis includes correlations with a time lag, given in number of weeks,
which shifts corresponding correlation pairs and shows a delayed effect of weather
conditions. The time lag ranges between 0 and 52. Results: Canine babesiosis
occurrence shows a pronounced maximum in the spring and a less marked one in
the autumn. For the spring period, statistically significant correlation coefficients
imply that over one year prior to the disease spring peak, temperature is more
strongly linked with the number of cases than relative humidity. Conclusion:
Temperature and relative humidity, through their influence on population of
infected ticks, seem to be important meteorological drivers of the spring maximum
of canine babesios in Belgrade. Further understanding of this interplay can help
better contain the disease, and project its possible spread to other regions
prompted by climate change.
C3  - 24th Annual Congress of the European Society of Veterinary Clinical Pathology,  Belgrade, Serbia, October 5-8
T1  - Signature of weather conditions in the canine babesiosis spring peak in Belgrade, Serbia
SP  - 69
EP  - 69
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2487
ER  - 

@conference{
author = "Janjić, Filip and Sarvan, Darko and Tomanović, Snežana and Krstić, Vanja and Radonjić, Vladimir and Kovačević-Filipović, Milica and Ajtić, Jelena",
year = "2022",
abstract = "Background: Canine babesiosis, a tick-borne disease caused by Babesia canis,
shows a seasonality whose relationship with local weather conditions has not been
fully investigated. Objectives: Meteorological conditions can favour the tick-vector
activity, and thus lead to an increased number of cases of canine babesiosis. Hence,
our study looks into the link between the number of recorded cases, on the one
hand, and temperature and relative humidity on the other with an aim to quantify
their correlations. Material and Methods: Over 2013–2016, the data were
collected in Belgrade, the capital of the Republic of Serbia. The meteorological
parameters were obtained from the Republic Hydrometeorological Service of
Serbia. The analysis includes correlations with a time lag, given in number of weeks,
which shifts corresponding correlation pairs and shows a delayed effect of weather
conditions. The time lag ranges between 0 and 52. Results: Canine babesiosis
occurrence shows a pronounced maximum in the spring and a less marked one in
the autumn. For the spring period, statistically significant correlation coefficients
imply that over one year prior to the disease spring peak, temperature is more
strongly linked with the number of cases than relative humidity. Conclusion:
Temperature and relative humidity, through their influence on population of
infected ticks, seem to be important meteorological drivers of the spring maximum
of canine babesios in Belgrade. Further understanding of this interplay can help
better contain the disease, and project its possible spread to other regions
prompted by climate change.",
journal = "24th Annual Congress of the European Society of Veterinary Clinical Pathology,  Belgrade, Serbia, October 5-8",
title = "Signature of weather conditions in the canine babesiosis spring peak in Belgrade, Serbia",
pages = "69-69",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2487"
}

Janjić, F., Sarvan, D., Tomanović, S., Krstić, V., Radonjić, V., Kovačević-Filipović, M.,& Ajtić, J.. (2022). Signature of weather conditions in the canine babesiosis spring peak in Belgrade, Serbia. in 24th Annual Congress of the European Society of Veterinary Clinical Pathology,  Belgrade, Serbia, October 5-8, 69-69.
https://hdl.handle.net/21.15107/rcub_veterinar_2487

Janjić F, Sarvan D, Tomanović S, Krstić V, Radonjić V, Kovačević-Filipović M, Ajtić J. Signature of weather conditions in the canine babesiosis spring peak in Belgrade, Serbia. in 24th Annual Congress of the European Society of Veterinary Clinical Pathology,  Belgrade, Serbia, October 5-8. 2022;:69-69.
https://hdl.handle.net/21.15107/rcub_veterinar_2487 .

Janjić, Filip, Sarvan, Darko, Tomanović, Snežana, Krstić, Vanja, Radonjić, Vladimir, Kovačević-Filipović, Milica, Ajtić, Jelena, "Signature of weather conditions in the canine babesiosis spring peak in Belgrade, Serbia" in 24th Annual Congress of the European Society of Veterinary Clinical Pathology,  Belgrade, Serbia, October 5-8 (2022):69-69,
https://hdl.handle.net/21.15107/rcub_veterinar_2487 .

TY  - CONF
AU  - Stratimirović, Đorđe
AU  - Hernández-Ceballos, Miguel Ángel
AU  - Brattich, Erika
AU  - Sarvan, Darko
AU  - Ajtić, Jelena
PY  - 2022
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2477
AB  - The natural radionuclide beryllium-7 (Be-7) is produced in the upper levels of the atmosphere and is transported to the surface on carrier aerosols. Therefore, among other factors, the abundance of Be-7 in the surface air is governed by the rate of its production and large-scale air transport. The North Atlantic Oscillation (NAO) index, which quantifies the surface sea-level pressure difference between the Subtropical (Azores) High and Subpolar low, exerts large effects on precipitation and circulation patterns in Europe. With an aim to look closely into the interrelations between the Be-7 specific activity in the surface air, sunspot number (as a proxy for the production signal), and NAO index, this paper investigates their long-term time series over 28 years, between February 1987 and December 2014.
The Be-7 specific activity was recorded in Vienna (48.22 ºN; 16.35 ºE; 193 m a.s.l.), Austria, and stored in the Radioactivity Environmental Monitoring databank (REMdb) that is created and supported by the European Commission-Joint Research Centre in Ispra, Italy. The sunspot number (SN) data were downloaded from SILSO (Royal Observatory of Belgium, Brussels, Belgium), while the NAO records were retrieved from the Climate Prediction Centre of the National Oceanic and Atmospheric Administration, USA. Since the temporal resolution of the Be-7 measurements varied between six and eight days, they were first linearly interpolated into an array of weekly data, and then, the daily SN and NAO data were averaged into weekly records to match the Be-7 data. Next, Pearson’s correlation analysis and wavelet transform were used to analyse the time series.
The low Pearson’s correlation coefficients between the Be-7 specific activity in the surface air and SN (-0.15207) on one hand, and the NAO index and SN (0.13512) on the other hand, imply a lack of direct linear interrelations between these variables. The Pearson’s correlation coefficient between the Be-7 specific activity in the surface air and NAO index is even lower (-0.05904). However, the Be-7 specific activity wavelet spectrum shows a pronounced annual period, and looking further into the link between the Be-7 specific activity and NAO index at this characteristic periodicity, reveals a prominent pattern. Specifically, the wavelet coherence levels between these two parameters show variations that seem to be in agreement with the 11-year solar cycle: the coherence increases as the sunspot number transitions between its extremes, and it decreases around the maxima and minima in sunspot number. Further, phase difference shows that at the one-year periodicity, the Be-7 specific activity always lags behind the NAO index. The phase difference ranges between 2 and 6 months; it reaches the minimum around the solar activity extremes, and the maximum in-between.
These findings imply that, although weak, the signature of sunspot number can be seen in the wavelet coherence level between the Be-7 specific activity and NAO index.
PB  - RAD Association
C3  - RAD Conference Proceedings
T1  - Interrelation between the beryllium-7 specific activity in the surface air and North Atlantic Oscillation based on their wavelet coherence
SP  - 110
DO  - 10.21175/rad.sum.abstr.book.2022.27.2
ER  - 

@conference{
author = "Stratimirović, Đorđe and Hernández-Ceballos, Miguel Ángel and Brattich, Erika and Sarvan, Darko and Ajtić, Jelena",
year = "2022",
abstract = "The natural radionuclide beryllium-7 (Be-7) is produced in the upper levels of the atmosphere and is transported to the surface on carrier aerosols. Therefore, among other factors, the abundance of Be-7 in the surface air is governed by the rate of its production and large-scale air transport. The North Atlantic Oscillation (NAO) index, which quantifies the surface sea-level pressure difference between the Subtropical (Azores) High and Subpolar low, exerts large effects on precipitation and circulation patterns in Europe. With an aim to look closely into the interrelations between the Be-7 specific activity in the surface air, sunspot number (as a proxy for the production signal), and NAO index, this paper investigates their long-term time series over 28 years, between February 1987 and December 2014.
The Be-7 specific activity was recorded in Vienna (48.22 ºN; 16.35 ºE; 193 m a.s.l.), Austria, and stored in the Radioactivity Environmental Monitoring databank (REMdb) that is created and supported by the European Commission-Joint Research Centre in Ispra, Italy. The sunspot number (SN) data were downloaded from SILSO (Royal Observatory of Belgium, Brussels, Belgium), while the NAO records were retrieved from the Climate Prediction Centre of the National Oceanic and Atmospheric Administration, USA. Since the temporal resolution of the Be-7 measurements varied between six and eight days, they were first linearly interpolated into an array of weekly data, and then, the daily SN and NAO data were averaged into weekly records to match the Be-7 data. Next, Pearson’s correlation analysis and wavelet transform were used to analyse the time series.
The low Pearson’s correlation coefficients between the Be-7 specific activity in the surface air and SN (-0.15207) on one hand, and the NAO index and SN (0.13512) on the other hand, imply a lack of direct linear interrelations between these variables. The Pearson’s correlation coefficient between the Be-7 specific activity in the surface air and NAO index is even lower (-0.05904). However, the Be-7 specific activity wavelet spectrum shows a pronounced annual period, and looking further into the link between the Be-7 specific activity and NAO index at this characteristic periodicity, reveals a prominent pattern. Specifically, the wavelet coherence levels between these two parameters show variations that seem to be in agreement with the 11-year solar cycle: the coherence increases as the sunspot number transitions between its extremes, and it decreases around the maxima and minima in sunspot number. Further, phase difference shows that at the one-year periodicity, the Be-7 specific activity always lags behind the NAO index. The phase difference ranges between 2 and 6 months; it reaches the minimum around the solar activity extremes, and the maximum in-between.
These findings imply that, although weak, the signature of sunspot number can be seen in the wavelet coherence level between the Be-7 specific activity and NAO index.",
publisher = "RAD Association",
journal = "RAD Conference Proceedings",
title = "Interrelation between the beryllium-7 specific activity in the surface air and North Atlantic Oscillation based on their wavelet coherence",
pages = "110",
doi = "10.21175/rad.sum.abstr.book.2022.27.2"
}

Stratimirović, Đ., Hernández-Ceballos, M. Á., Brattich, E., Sarvan, D.,& Ajtić, J.. (2022). Interrelation between the beryllium-7 specific activity in the surface air and North Atlantic Oscillation based on their wavelet coherence. in RAD Conference Proceedings
RAD Association., 110.
https://doi.org/10.21175/rad.sum.abstr.book.2022.27.2

Stratimirović Đ, Hernández-Ceballos MÁ, Brattich E, Sarvan D, Ajtić J. Interrelation between the beryllium-7 specific activity in the surface air and North Atlantic Oscillation based on their wavelet coherence. in RAD Conference Proceedings. 2022;:110.
doi:10.21175/rad.sum.abstr.book.2022.27.2 .

Stratimirović, Đorđe, Hernández-Ceballos, Miguel Ángel, Brattich, Erika, Sarvan, Darko, Ajtić, Jelena, "Interrelation between the beryllium-7 specific activity in the surface air and North Atlantic Oscillation based on their wavelet coherence" in RAD Conference Proceedings (2022):110,
https://doi.org/10.21175/rad.sum.abstr.book.2022.27.2 . .

TY  - CONF
AU  - Bianchi, Stefano
AU  - Plastino, Wolfango
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Todorović, Dragana
AU  - Zorko, Benjamin
AU  - Nečemer, Marijan
AU  - Vodenik, Branko
AU  - Glavič Cindro, Denis
AU  - Kožar Logar, Jasmina
AU  - Sarvan, Darko
AU  - Đurđević, Vladimir
AU  - Ajtić, Jelena
PY  - 2022
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2479
AB  - Beryllium-7 is a natural radionuclide used as a tracer of the stratospheric-tropospheric exchange. Its abundance in the surface air is expected to change as the temperatures in the atmosphere increase.
To investigate the temporal trends of the beryllium-7 activity concentrations and temperature, we apply spectral analysis to time series from three sampling sites: Belgrade in Serbia, and Ljubljana and Krško in Slovenia. The sites lie close to the 45 ºN parallel, with Krško approximately 400 km and Ljubljana around 500 km west of Belgrade. Between January 1991 and December 2019, the air filter samples were collected using air samplers; a monthly composite sample was formed and analysed by gamma spectrometry. We use monthly mean temperature records from the European Climate Assessment & Dataset, the Republic Hydrometeorological Service of Serbia for Belgrade, and the Slovenian Environment Agency for the sites in Slovenia.
In the spectral analysis decomposition, we look into a term called trend that represents the overall growth (increase or decrease) in the data records. The trend is calculated using a linear fit. All three sites show 1) positive temperature trends, however statistically insignificant (at the 95 % confidence level), and 2) statistically significant beryllium-7 activity concentration trends of 2.26 %/year, 1.13 %/year, and 0.50 %/year in Belgrade, Ljubljana, and Krško, respectively.
The results confirm our initial hypothesis–over the 28 investigated years, the beryllium-7 activity concentrations increase in the surface air. On the other hand, the non-significant temperature rise in our records suggests that within our method, the temporal resolution of one month is insufficient for obtaining a statistically significant temperature trend.
PB  - Niš : Sievert Association
C3  - International conference on radiation applications (RAP 2022)
T1  - Beryllium-7 activity concentration trends in Serbia and Slovenia
SP  - 45
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2479
ER  - 

@conference{
author = "Bianchi, Stefano and Plastino, Wolfango and Rajačić, Milica and Krneta Nikolić, Jelena and Todorović, Dragana and Zorko, Benjamin and Nečemer, Marijan and Vodenik, Branko and Glavič Cindro, Denis and Kožar Logar, Jasmina and Sarvan, Darko and Đurđević, Vladimir and Ajtić, Jelena",
year = "2022",
abstract = "Beryllium-7 is a natural radionuclide used as a tracer of the stratospheric-tropospheric exchange. Its abundance in the surface air is expected to change as the temperatures in the atmosphere increase.
To investigate the temporal trends of the beryllium-7 activity concentrations and temperature, we apply spectral analysis to time series from three sampling sites: Belgrade in Serbia, and Ljubljana and Krško in Slovenia. The sites lie close to the 45 ºN parallel, with Krško approximately 400 km and Ljubljana around 500 km west of Belgrade. Between January 1991 and December 2019, the air filter samples were collected using air samplers; a monthly composite sample was formed and analysed by gamma spectrometry. We use monthly mean temperature records from the European Climate Assessment & Dataset, the Republic Hydrometeorological Service of Serbia for Belgrade, and the Slovenian Environment Agency for the sites in Slovenia.
In the spectral analysis decomposition, we look into a term called trend that represents the overall growth (increase or decrease) in the data records. The trend is calculated using a linear fit. All three sites show 1) positive temperature trends, however statistically insignificant (at the 95 % confidence level), and 2) statistically significant beryllium-7 activity concentration trends of 2.26 %/year, 1.13 %/year, and 0.50 %/year in Belgrade, Ljubljana, and Krško, respectively.
The results confirm our initial hypothesis–over the 28 investigated years, the beryllium-7 activity concentrations increase in the surface air. On the other hand, the non-significant temperature rise in our records suggests that within our method, the temporal resolution of one month is insufficient for obtaining a statistically significant temperature trend.",
publisher = "Niš : Sievert Association",
journal = "International conference on radiation applications (RAP 2022)",
title = "Beryllium-7 activity concentration trends in Serbia and Slovenia",
pages = "45",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2479"
}

Bianchi, S., Plastino, W., Rajačić, M., Krneta Nikolić, J., Todorović, D., Zorko, B., Nečemer, M., Vodenik, B., Glavič Cindro, D., Kožar Logar, J., Sarvan, D., Đurđević, V.,& Ajtić, J.. (2022). Beryllium-7 activity concentration trends in Serbia and Slovenia. in International conference on radiation applications (RAP 2022)
Niš : Sievert Association., 45.
https://hdl.handle.net/21.15107/rcub_veterinar_2479

Bianchi S, Plastino W, Rajačić M, Krneta Nikolić J, Todorović D, Zorko B, Nečemer M, Vodenik B, Glavič Cindro D, Kožar Logar J, Sarvan D, Đurđević V, Ajtić J. Beryllium-7 activity concentration trends in Serbia and Slovenia. in International conference on radiation applications (RAP 2022). 2022;:45.
https://hdl.handle.net/21.15107/rcub_veterinar_2479 .

Bianchi, Stefano, Plastino, Wolfango, Rajačić, Milica, Krneta Nikolić, Jelena, Todorović, Dragana, Zorko, Benjamin, Nečemer, Marijan, Vodenik, Branko, Glavič Cindro, Denis, Kožar Logar, Jasmina, Sarvan, Darko, Đurđević, Vladimir, Ajtić, Jelena, "Beryllium-7 activity concentration trends in Serbia and Slovenia" in International conference on radiation applications (RAP 2022) (2022):45,
https://hdl.handle.net/21.15107/rcub_veterinar_2479 .

TY  - CONF
AU  - Blesić, Suzana
AU  - Sarvan, Darko
AU  - Tošić, Milica
AU  - Borovinić, Marko
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2703
AB  - We used the Hurst Space Analysis (HSA), a technique that we recently developed to cluster or differentiate records from an arbitrary complex system based on the presence and influence of cycles in their statistical functions, to classify climatic data from climatically homogeneous regions according to their long-term persistent (LTP) character. For our analysis we selected four types of HadCRUT4 cells of temperature records over regions homogeneous in both climate and topography, which are sufficiently populated with ground observational stations. These cells bound: Pannonian and West Siberian plains, Rocky Mountains and Himalayas mountainous regions, Arctic and sub-Arctic climates of Island and Alaska, and Gobi and Sahara deserts.
C3  - EGU General Assembly 2021, 19-30 April 2021 online (pp. EGU21-238)
T1  - Classification of time series of temperature variations from climatically homogeneous regions using Hurst Space Analysis
DO  - 10.5194/egusphere-egu21-238
ER  - 

@conference{
author = "Blesić, Suzana and Sarvan, Darko and Tošić, Milica and Borovinić, Marko",
year = "2021",
abstract = "We used the Hurst Space Analysis (HSA), a technique that we recently developed to cluster or differentiate records from an arbitrary complex system based on the presence and influence of cycles in their statistical functions, to classify climatic data from climatically homogeneous regions according to their long-term persistent (LTP) character. For our analysis we selected four types of HadCRUT4 cells of temperature records over regions homogeneous in both climate and topography, which are sufficiently populated with ground observational stations. These cells bound: Pannonian and West Siberian plains, Rocky Mountains and Himalayas mountainous regions, Arctic and sub-Arctic climates of Island and Alaska, and Gobi and Sahara deserts.",
journal = "EGU General Assembly 2021, 19-30 April 2021 online (pp. EGU21-238)",
title = "Classification of time series of temperature variations from climatically homogeneous regions using Hurst Space Analysis",
doi = "10.5194/egusphere-egu21-238"
}

Blesić, S., Sarvan, D., Tošić, M.,& Borovinić, M.. (2021). Classification of time series of temperature variations from climatically homogeneous regions using Hurst Space Analysis. in EGU General Assembly 2021, 19-30 April 2021 online (pp. EGU21-238).
https://doi.org/10.5194/egusphere-egu21-238

Blesić S, Sarvan D, Tošić M, Borovinić M. Classification of time series of temperature variations from climatically homogeneous regions using Hurst Space Analysis. in EGU General Assembly 2021, 19-30 April 2021 online (pp. EGU21-238). 2021;.
doi:10.5194/egusphere-egu21-238 .

Blesić, Suzana, Sarvan, Darko, Tošić, Milica, Borovinić, Marko, "Classification of time series of temperature variations from climatically homogeneous regions using Hurst Space Analysis" in EGU General Assembly 2021, 19-30 April 2021 online (pp. EGU21-238) (2021),
https://doi.org/10.5194/egusphere-egu21-238 . .

TY  - JOUR
AU  - Sarvan, Darko
AU  - Tošić, Milica
AU  - Borovinić, Marko
AU  - Blesić, Suzana
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2058
AB  - We used detrended methods for scaling analysis (DFA2 and DMA) and wavelet transform spectral analysis (WTS) to characterize long-term persistence (LTP) properties of temperature anomalies time series from observational stations from climatically and topologically homogeneous HadCRUT4 grid cells. We were interested to investigate the validity of the expectation that their LTP scaling properties remain preserved in the process of HadCRUT4 spatially interpolated and bias adjusted averaging, which was indeed the case in our selection. We additionally utilized the Hurst space analysis (HSA), a methodological solution that we recently developed, to classify climatic records from our dataset according to their LTP character and similarity of their WTS cyclical presentation. We were able to use HSA to observe four distinct patterns of climate dynamic behaviour according to the ‘preferred’ characteristic that those do not ‘belong to the ocean’. In this way, our results suggested that there probably exists a necessity to examine cycles in climate records as important elements of natural variability. To illustrate how the procedure developed in this article can be extended, we used HSA developed by the use of a dataset from climatically and topologically homogeneous regions to classified time series of teleconnection indices that may have influence on their regional climate. HSA can be further systematically utilized in this way, to link LTP properties of temperature anomalies with their possible spatially remote sources.
T2  - International Journal of Climatology
T1  - Classification of time series of temperature variations from climatically homogeneous regions based on long-term persistence
VL  - 41
IS  - 4
SP  - 2660
EP  - 2678
DO  - https://doi.org/10.1002/joc.6982
ER  - 

@article{
author = "Sarvan, Darko and Tošić, Milica and Borovinić, Marko and Blesić, Suzana",
year = "2021",
abstract = "We used detrended methods for scaling analysis (DFA2 and DMA) and wavelet transform spectral analysis (WTS) to characterize long-term persistence (LTP) properties of temperature anomalies time series from observational stations from climatically and topologically homogeneous HadCRUT4 grid cells. We were interested to investigate the validity of the expectation that their LTP scaling properties remain preserved in the process of HadCRUT4 spatially interpolated and bias adjusted averaging, which was indeed the case in our selection. We additionally utilized the Hurst space analysis (HSA), a methodological solution that we recently developed, to classify climatic records from our dataset according to their LTP character and similarity of their WTS cyclical presentation. We were able to use HSA to observe four distinct patterns of climate dynamic behaviour according to the ‘preferred’ characteristic that those do not ‘belong to the ocean’. In this way, our results suggested that there probably exists a necessity to examine cycles in climate records as important elements of natural variability. To illustrate how the procedure developed in this article can be extended, we used HSA developed by the use of a dataset from climatically and topologically homogeneous regions to classified time series of teleconnection indices that may have influence on their regional climate. HSA can be further systematically utilized in this way, to link LTP properties of temperature anomalies with their possible spatially remote sources.",
journal = "International Journal of Climatology",
title = "Classification of time series of temperature variations from climatically homogeneous regions based on long-term persistence",
volume = "41",
number = "4",
pages = "2660-2678",
doi = "https://doi.org/10.1002/joc.6982"
}

Sarvan, D., Tošić, M., Borovinić, M.,& Blesić, S.. (2021). Classification of time series of temperature variations from climatically homogeneous regions based on long-term persistence. in International Journal of Climatology, 41(4), 2660-2678.
https://doi.org/https://doi.org/10.1002/joc.6982

Sarvan D, Tošić M, Borovinić M, Blesić S. Classification of time series of temperature variations from climatically homogeneous regions based on long-term persistence. in International Journal of Climatology. 2021;41(4):2660-2678.
doi:https://doi.org/10.1002/joc.6982 .

Sarvan, Darko, Tošić, Milica, Borovinić, Marko, Blesić, Suzana, "Classification of time series of temperature variations from climatically homogeneous regions based on long-term persistence" in International Journal of Climatology, 41, no. 4 (2021):2660-2678,
https://doi.org/https://doi.org/10.1002/joc.6982 . .

TY  - JOUR
AU  - Brattich, Erika
AU  - Liu, Hongyu
AU  - Zhang, Bo
AU  - Hernández-Ceballos, Miguel Ángel
AU  - Paatero, Jussi
AU  - Sarvan, Darko
AU  - Djurdjević, Vladimir
AU  - Tositti, Laura
AU  - Ajtić, Jelena
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2336
AB  - Abstract. Events of very high concentrations of 7Be cosmogenic radionuclide have been recorded at low-elevation surface stations in the subpolar regions of Europe during the cold season. With an aim to investigate the mechanisms responsible for those peak 7Be events, and in particular to verify if they are associated with the fast descent of stratospheric air masses occurring during sudden stratospheric warming (SSW) events, we analyze 7Be observations at six sampling sites in Fennoscandia during January–March 2003 when very high 7Be concentrations were observed and the Arctic vortex was relatively unstable as a consequence of several SSW events. We use the GEOS-Chem chemistry and transport model driven by the MERRA-2 meteorological reanalysis to simulate tropospheric 7Be over northern Europe. We show that the model reasonably reproduces the temporal evolution of surface 7Be concentrations observed at the six sampling sites. Our analysis of model simulations, surface 7Be observations, atmospheric soundings of ozone and temperature and surface ozone measurements indicates that the 7Be peak observed in late February 2003 (between 20 and 28 February 2003) at the six sampling sites in Fennoscandia was associated with downward transport of stratospheric vortex air that originated during an SSW that occurred a few days earlier (between 18 and 21 February 2003).
T2  - Atmospheric Chemistry and Physics
T1  - Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003
VL  - 21
IS  - 23
SP  - 17927
EP  - 17951
DO  - 10.5194/acp-21-17927-2021
ER  - 

@article{
author = "Brattich, Erika and Liu, Hongyu and Zhang, Bo and Hernández-Ceballos, Miguel Ángel and Paatero, Jussi and Sarvan, Darko and Djurdjević, Vladimir and Tositti, Laura and Ajtić, Jelena",
year = "2021",
abstract = "Abstract. Events of very high concentrations of 7Be cosmogenic radionuclide have been recorded at low-elevation surface stations in the subpolar regions of Europe during the cold season. With an aim to investigate the mechanisms responsible for those peak 7Be events, and in particular to verify if they are associated with the fast descent of stratospheric air masses occurring during sudden stratospheric warming (SSW) events, we analyze 7Be observations at six sampling sites in Fennoscandia during January–March 2003 when very high 7Be concentrations were observed and the Arctic vortex was relatively unstable as a consequence of several SSW events. We use the GEOS-Chem chemistry and transport model driven by the MERRA-2 meteorological reanalysis to simulate tropospheric 7Be over northern Europe. We show that the model reasonably reproduces the temporal evolution of surface 7Be concentrations observed at the six sampling sites. Our analysis of model simulations, surface 7Be observations, atmospheric soundings of ozone and temperature and surface ozone measurements indicates that the 7Be peak observed in late February 2003 (between 20 and 28 February 2003) at the six sampling sites in Fennoscandia was associated with downward transport of stratospheric vortex air that originated during an SSW that occurred a few days earlier (between 18 and 21 February 2003).",
journal = "Atmospheric Chemistry and Physics",
title = "Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003",
volume = "21",
number = "23",
pages = "17927-17951",
doi = "10.5194/acp-21-17927-2021"
}

Brattich, E., Liu, H., Zhang, B., Hernández-Ceballos, M. Á., Paatero, J., Sarvan, D., Djurdjević, V., Tositti, L.,& Ajtić, J.. (2021). Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003. in Atmospheric Chemistry and Physics, 21(23), 17927-17951.
https://doi.org/10.5194/acp-21-17927-2021

Brattich E, Liu H, Zhang B, Hernández-Ceballos MÁ, Paatero J, Sarvan D, Djurdjević V, Tositti L, Ajtić J. Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003. in Atmospheric Chemistry and Physics. 2021;21(23):17927-17951.
doi:10.5194/acp-21-17927-2021 .

Brattich, Erika, Liu, Hongyu, Zhang, Bo, Hernández-Ceballos, Miguel Ángel, Paatero, Jussi, Sarvan, Darko, Djurdjević, Vladimir, Tositti, Laura, Ajtić, Jelena, "Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003" in Atmospheric Chemistry and Physics, 21, no. 23 (2021):17927-17951,
https://doi.org/10.5194/acp-21-17927-2021 . .

TY  - DATA
AU  - Brattich, Erika
AU  - Liu, Hongyu
AU  - Zhang, Bo
AU  - Hernández-Ceballos, Miguel Ángel
AU  - Paatero, Jussi
AU  - Sarvan, Darko
AU  - Djurdjević, Vladimir
AU  - Tositti, Laura
AU  - Ajtić, Jelena
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2337
T2  - Atmospheric Chemistry and Physics
T1  - Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021
VL  - 21
IS  - 23
SP  - 17927
EP  - 17951
DO  - 10.5194/acp-21-17927-2021-supplement
ER  - 

@misc{
author = "Brattich, Erika and Liu, Hongyu and Zhang, Bo and Hernández-Ceballos, Miguel Ángel and Paatero, Jussi and Sarvan, Darko and Djurdjević, Vladimir and Tositti, Laura and Ajtić, Jelena",
year = "2021",
journal = "Atmospheric Chemistry and Physics",
title = "Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021",
volume = "21",
number = "23",
pages = "17927-17951",
doi = "10.5194/acp-21-17927-2021-supplement"
}

Brattich, E., Liu, H., Zhang, B., Hernández-Ceballos, M. Á., Paatero, J., Sarvan, D., Djurdjević, V., Tositti, L.,& Ajtić, J.. (2021). Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021. in Atmospheric Chemistry and Physics, 21(23), 17927-17951.
https://doi.org/10.5194/acp-21-17927-2021-supplement

Brattich E, Liu H, Zhang B, Hernández-Ceballos MÁ, Paatero J, Sarvan D, Djurdjević V, Tositti L, Ajtić J. Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021. in Atmospheric Chemistry and Physics. 2021;21(23):17927-17951.
doi:10.5194/acp-21-17927-2021-supplement .

Brattich, Erika, Liu, Hongyu, Zhang, Bo, Hernández-Ceballos, Miguel Ángel, Paatero, Jussi, Sarvan, Darko, Djurdjević, Vladimir, Tositti, Laura, Ajtić, Jelena, "Supplementary data for article:  Brattich, E.; Liu, H.; Zhang, B.; Hernández-Ceballos, M. Á.; Paatero, J.; Sarvan, D.; Djurdjevic, V.; Tositti, L.; Ajtić, J. Observation and Modeling of High-7Be Concentration Events at the Surface in Northern Europe Associated with the Instability of the Arctic Polar Vortex in Early 2003. Atmospheric Chemistry and Physics 2021, 21 (23), 17927–17951. https://doi.org/10.5194/acp-21-17927-2021" in Atmospheric Chemistry and Physics, 21, no. 23 (2021):17927-17951,
https://doi.org/10.5194/acp-21-17927-2021-supplement . .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Zorko, B.
AU  - Nečemer, M.
AU  - Sarvan, Darko
AU  - Rajačić, M.
AU  - Krneta Nikolić, J.
AU  - Todorović, D.
AU  - Djurdjevic, V.
AU  - Vodenik, B.
AU  - Glavič Cindro, D.
AU  - Kožar Logar, J.
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2364
AB  - This study investigates the beryllium-7, lead-210 and caesium-137 activity concentrations in aerosol filter samples collected monthly along the 45°N zonal belt over 1991–2019. Sampling was performed in three locations, one in Serbia and two in Slovenia, and the Slovenian data records are published here for the first time. The activity concentrations were determined by standard gamma spectrometry. The obtained results are in general agreement with the literature data for Europe. The data sets at different sites display similarities in measurement ranges, overall means and seasonal cycles. Still, statistical tests show significant differences among the radionuclides’ concentrations across the locations. To investigate underlying processes that affect radioactivity in the surface air in this region, multivariate statistical concepts are applied to the radionuclides’ concentrations and local meteorological parameters. Discriminant analysis shows that all three sites are well separated from each other. Principal component analysis gives common pattern of interconnection between the observables: temperature has a stronger influence on the behaviour of beryllium-7 and lead-210 than that of caesium-137, but a negative correlation of the radionuclides’ concentrations with precipitation seems the strongest for caesium-137. Principal component analysis also shows local differences in the degree of relationship between the meteorological parameters and activity concentrations of the investigated radionuclides. This is an important finding for future atmospheric transport studies.
PB  - Springer
T2  - International Journal of Environmental Science and Technology
T1  - Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe
DO  - 10.1007/s13762-021-03814-0
ER  - 

@article{
author = "Ajtić, Jelena and Zorko, B. and Nečemer, M. and Sarvan, Darko and Rajačić, M. and Krneta Nikolić, J. and Todorović, D. and Djurdjevic, V. and Vodenik, B. and Glavič Cindro, D. and Kožar Logar, J.",
year = "2021",
abstract = "This study investigates the beryllium-7, lead-210 and caesium-137 activity concentrations in aerosol filter samples collected monthly along the 45°N zonal belt over 1991–2019. Sampling was performed in three locations, one in Serbia and two in Slovenia, and the Slovenian data records are published here for the first time. The activity concentrations were determined by standard gamma spectrometry. The obtained results are in general agreement with the literature data for Europe. The data sets at different sites display similarities in measurement ranges, overall means and seasonal cycles. Still, statistical tests show significant differences among the radionuclides’ concentrations across the locations. To investigate underlying processes that affect radioactivity in the surface air in this region, multivariate statistical concepts are applied to the radionuclides’ concentrations and local meteorological parameters. Discriminant analysis shows that all three sites are well separated from each other. Principal component analysis gives common pattern of interconnection between the observables: temperature has a stronger influence on the behaviour of beryllium-7 and lead-210 than that of caesium-137, but a negative correlation of the radionuclides’ concentrations with precipitation seems the strongest for caesium-137. Principal component analysis also shows local differences in the degree of relationship between the meteorological parameters and activity concentrations of the investigated radionuclides. This is an important finding for future atmospheric transport studies.",
publisher = "Springer",
journal = "International Journal of Environmental Science and Technology",
title = "Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe",
doi = "10.1007/s13762-021-03814-0"
}

Ajtić, J., Zorko, B., Nečemer, M., Sarvan, D., Rajačić, M., Krneta Nikolić, J., Todorović, D., Djurdjevic, V., Vodenik, B., Glavič Cindro, D.,& Kožar Logar, J.. (2021). Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe. in International Journal of Environmental Science and Technology
Springer..
https://doi.org/10.1007/s13762-021-03814-0

Ajtić J, Zorko B, Nečemer M, Sarvan D, Rajačić M, Krneta Nikolić J, Todorović D, Djurdjevic V, Vodenik B, Glavič Cindro D, Kožar Logar J. Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe. in International Journal of Environmental Science and Technology. 2021;.
doi:10.1007/s13762-021-03814-0 .

Ajtić, Jelena, Zorko, B., Nečemer, M., Sarvan, Darko, Rajačić, M., Krneta Nikolić, J., Todorović, D., Djurdjevic, V., Vodenik, B., Glavič Cindro, D., Kožar Logar, J., "Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe" in International Journal of Environmental Science and Technology (2021),
https://doi.org/10.1007/s13762-021-03814-0 . .

TY  - CONF
AU  - Stratimirović, Djordje
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Djurdjević, Vladimir
AU  - Ajtić, Jelena
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2371
AB  - U ovom radu razmatramo vremenske serije srednjih nedeljnih specifičnih aktivnosti
berilijuma-7 u vazduhu i temperature na lokaciji Beč (48,22 ºN; 16,35 ºE; 193 m n.v.) u
Austriji, koje su zabeležene od februara 1987. do decembra 2014. godine. Merenja
specifične aktivnosti berilijuma-7 u prizmenom sloju vazduha preuzeta su iz
Radioactivity Environmental Monitoring databank (REMdb) koju održava Objedinjeni
istraživački centar u Ispri, Italija, a podaci za lokalnu temperaturu iz E-OBS gridovane
klimatologije (verzija 15) koji su potom bilinearnom interpolacijom ekstrahovani na
lokaciju uzorkovanja berilijuma-7. Za analizu serija koristili smo korelacionu analizu i
vejvlet transformacije. Vrednost Pirsonovog koeficijenta korelacije od 0,68 ukazuje na
jaku vezu između nedeljnih specifičnih aktivnosti berilijuma-7 i temperature, dok vejvlet
spektri snage pokazuju izraziti godišnji period za obe varijable tokom ispitivanog
vremenskog intervala. Godišnji period dominantno je vidljiv i na kros-korelacionom
spektru. Takođe je uočen blagi fazni pomeraj koji ukazuje da promena specifične
aktivnosti berilijuma-7 merene u prizemnom sloju vazduha prethodi promeni
temperature
PB  - Institut za nuklearne nauke „Vinča“
C3  - Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija
T1  - Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti
SP  - 27
EP  - 31
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2371
ER  - 

@conference{
author = "Stratimirović, Djordje and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Djurdjević, Vladimir and Ajtić, Jelena",
year = "2021",
abstract = "U ovom radu razmatramo vremenske serije srednjih nedeljnih specifičnih aktivnosti
berilijuma-7 u vazduhu i temperature na lokaciji Beč (48,22 ºN; 16,35 ºE; 193 m n.v.) u
Austriji, koje su zabeležene od februara 1987. do decembra 2014. godine. Merenja
specifične aktivnosti berilijuma-7 u prizmenom sloju vazduha preuzeta su iz
Radioactivity Environmental Monitoring databank (REMdb) koju održava Objedinjeni
istraživački centar u Ispri, Italija, a podaci za lokalnu temperaturu iz E-OBS gridovane
klimatologije (verzija 15) koji su potom bilinearnom interpolacijom ekstrahovani na
lokaciju uzorkovanja berilijuma-7. Za analizu serija koristili smo korelacionu analizu i
vejvlet transformacije. Vrednost Pirsonovog koeficijenta korelacije od 0,68 ukazuje na
jaku vezu između nedeljnih specifičnih aktivnosti berilijuma-7 i temperature, dok vejvlet
spektri snage pokazuju izraziti godišnji period za obe varijable tokom ispitivanog
vremenskog intervala. Godišnji period dominantno je vidljiv i na kros-korelacionom
spektru. Takođe je uočen blagi fazni pomeraj koji ukazuje da promena specifične
aktivnosti berilijuma-7 merene u prizemnom sloju vazduha prethodi promeni
temperature",
publisher = "Institut za nuklearne nauke „Vinča“",
journal = "Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija",
title = "Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti",
pages = "27-31",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2371"
}

Stratimirović, D., Sarvan, D., Brattich, E., Hernández-Ceballos, M. A., Djurdjević, V.,& Ajtić, J.. (2021). Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti. in Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija
Institut za nuklearne nauke „Vinča“., 27-31.
https://hdl.handle.net/21.15107/rcub_veterinar_2371

Stratimirović D, Sarvan D, Brattich E, Hernández-Ceballos MA, Djurdjević V, Ajtić J. Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti. in Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija. 2021;:27-31.
https://hdl.handle.net/21.15107/rcub_veterinar_2371 .

Stratimirović, Djordje, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Djurdjević, Vladimir, Ajtić, Jelena, "Korelacione karakteristike specifične aktivnosti berilijuma-7 i temperature na dugogodišnjim nizovima nedeljnih vrednosti" in Zbornik radova sa XXXI Simpozijuma Društva za zaštitu od zračenja Srbije i Crne Gore, 6–8. oktobar, 2021, Beograd, Srbija (2021):27-31,
https://hdl.handle.net/21.15107/rcub_veterinar_2371 .

TY  - CONF
AU  - Blesić, Suzana
AU  - Sarvan, Darko
PY  - 2020
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2752
AB  - It was shown for variables across different complex systems that their fluctuation functions calculated with detrending methods of scaling analysis are rarely, as in theory, ideal linear functions on log-log graphs of scale dependence. Instead, they frequently exhibit existence of transient crossovers in behavior, signs of trends that arise as effects of periodic or aperiodic cycles (Hu et al., 2001). The use of global and local wavelet transform spectral analysis (WTS) and their detrended fluctuation analysis (DFA) variants provides a possibility to detect these cyclic trends and to investigate their timing, nature and effects on the analyzed time series.
C3  - Conference on Complex Systems, 7-11 December 2020
T1  - Hurst Space Analysis, data clustering technique for long-range correlated time series
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2752
ER  - 

@conference{
author = "Blesić, Suzana and Sarvan, Darko",
year = "2020",
abstract = "It was shown for variables across different complex systems that their fluctuation functions calculated with detrending methods of scaling analysis are rarely, as in theory, ideal linear functions on log-log graphs of scale dependence. Instead, they frequently exhibit existence of transient crossovers in behavior, signs of trends that arise as effects of periodic or aperiodic cycles (Hu et al., 2001). The use of global and local wavelet transform spectral analysis (WTS) and their detrended fluctuation analysis (DFA) variants provides a possibility to detect these cyclic trends and to investigate their timing, nature and effects on the analyzed time series.",
journal = "Conference on Complex Systems, 7-11 December 2020",
title = "Hurst Space Analysis, data clustering technique for long-range correlated time series",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2752"
}

Blesić, S.,& Sarvan, D.. (2020). Hurst Space Analysis, data clustering technique for long-range correlated time series. in Conference on Complex Systems, 7-11 December 2020.
https://hdl.handle.net/21.15107/rcub_veterinar_2752

Blesić S, Sarvan D. Hurst Space Analysis, data clustering technique for long-range correlated time series. in Conference on Complex Systems, 7-11 December 2020. 2020;.
https://hdl.handle.net/21.15107/rcub_veterinar_2752 .

Blesić, Suzana, Sarvan, Darko, "Hurst Space Analysis, data clustering technique for long-range correlated time series" in Conference on Complex Systems, 7-11 December 2020 (2020),
https://hdl.handle.net/21.15107/rcub_veterinar_2752 .

TY  - JOUR
AU  - Janjić, Filip
AU  - Sarvan, Darko
AU  - Tomanović, Snežana
AU  - Cuk, Jelena
AU  - Krstić, Vanja
AU  - Radonjić, Vladimir
AU  - Kovačević-Filipović, Milica
AU  - Ajtić, Jelena
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1783
AB  - Belgrade, the capital of the Republic of Serbia, is an endemic location for canine babesiosis caused by Babesia canis. This tick-borne disease occurs seasonally in regions with moderate continental climate. However, recent clinical data show that 1) some cases of canine babesiosis have been recorded during the winter, and 2) canine babesiosis is spreading to the northern parts of Europe with a colder climate, which is a region previously free of this disease. Our study investigates the occurrence of canine babesiosis in different seasons over 2013-2016, and explores a short-term link between meteorological parameters and number of diagnosed cases of canine babesiosis in Belgrade. It also looks into possible long-term correlations that span one year before the onset of the disease. Based on 872 recorded cases over four years, our results show a bimodal seasonal distribution of canine babesiosis, with a pronounced peak in the spring, and a less conspicuous one in the autumn. Throughout the year, even over the coldest and warmest periods, there is a broad range of temperatures and relative humidifies when the disease is recorded. Over one year prior to the spring and autumn onset of the disease, we found a noticeable impact of temperature and relative humidity, and to a lesser extent, of atmospheric pressure and cloud cover, on the number of diagnosed cases. These findings imply short-term and long-term relationships between occurrence of acute canine babesiosis and certain meteorological parameters, and they open further questions that need to be investigated in order to understand the epidemiology of this disease.
PB  - Elsevier Gmbh, Munich
T2  - Ticks and Tick-Borne Diseases
T1  - A short-term and long-term relationship between occurrence of acute canine babesiosis and meteorological parameters in Belgrade, Serbia
VL  - 10
IS  - 6
SP  - UNSP 101273
DO  - 10.1016/j.ttbdis.2019.101273
ER  - 

@article{
author = "Janjić, Filip and Sarvan, Darko and Tomanović, Snežana and Cuk, Jelena and Krstić, Vanja and Radonjić, Vladimir and Kovačević-Filipović, Milica and Ajtić, Jelena",
year = "2019",
abstract = "Belgrade, the capital of the Republic of Serbia, is an endemic location for canine babesiosis caused by Babesia canis. This tick-borne disease occurs seasonally in regions with moderate continental climate. However, recent clinical data show that 1) some cases of canine babesiosis have been recorded during the winter, and 2) canine babesiosis is spreading to the northern parts of Europe with a colder climate, which is a region previously free of this disease. Our study investigates the occurrence of canine babesiosis in different seasons over 2013-2016, and explores a short-term link between meteorological parameters and number of diagnosed cases of canine babesiosis in Belgrade. It also looks into possible long-term correlations that span one year before the onset of the disease. Based on 872 recorded cases over four years, our results show a bimodal seasonal distribution of canine babesiosis, with a pronounced peak in the spring, and a less conspicuous one in the autumn. Throughout the year, even over the coldest and warmest periods, there is a broad range of temperatures and relative humidifies when the disease is recorded. Over one year prior to the spring and autumn onset of the disease, we found a noticeable impact of temperature and relative humidity, and to a lesser extent, of atmospheric pressure and cloud cover, on the number of diagnosed cases. These findings imply short-term and long-term relationships between occurrence of acute canine babesiosis and certain meteorological parameters, and they open further questions that need to be investigated in order to understand the epidemiology of this disease.",
publisher = "Elsevier Gmbh, Munich",
journal = "Ticks and Tick-Borne Diseases",
title = "A short-term and long-term relationship between occurrence of acute canine babesiosis and meteorological parameters in Belgrade, Serbia",
volume = "10",
number = "6",
pages = "UNSP 101273",
doi = "10.1016/j.ttbdis.2019.101273"
}

Janjić, F., Sarvan, D., Tomanović, S., Cuk, J., Krstić, V., Radonjić, V., Kovačević-Filipović, M.,& Ajtić, J.. (2019). A short-term and long-term relationship between occurrence of acute canine babesiosis and meteorological parameters in Belgrade, Serbia. in Ticks and Tick-Borne Diseases
Elsevier Gmbh, Munich., 10(6), UNSP 101273.
https://doi.org/10.1016/j.ttbdis.2019.101273

Janjić F, Sarvan D, Tomanović S, Cuk J, Krstić V, Radonjić V, Kovačević-Filipović M, Ajtić J. A short-term and long-term relationship between occurrence of acute canine babesiosis and meteorological parameters in Belgrade, Serbia. in Ticks and Tick-Borne Diseases. 2019;10(6):UNSP 101273.
doi:10.1016/j.ttbdis.2019.101273 .

Janjić, Filip, Sarvan, Darko, Tomanović, Snežana, Cuk, Jelena, Krstić, Vanja, Radonjić, Vladimir, Kovačević-Filipović, Milica, Ajtić, Jelena, "A short-term and long-term relationship between occurrence of acute canine babesiosis and meteorological parameters in Belgrade, Serbia" in Ticks and Tick-Borne Diseases, 10, no. 6 (2019):UNSP 101273,
https://doi.org/10.1016/j.ttbdis.2019.101273 . .

TY  - THES
AU  - Sarvan, Darko
PY  - 2019
UR  - http://nardus.mpn.gov.rs/123456789/12244
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/56
AB  - In the very heart of this dissertation is one of the modern areas of physics - Econophysics. It uses theories and methodologies originally developed for the needs of statistical physics, along with other areas that contain nonlinear dynamics, in order to solve the problems in the economy...
AB  - U samom srcu ove disertacije je jedna od modernih oblasti fizike - Ekonofizika. U njoj se primenjuju teorije i metodologije originalno razvijane za potrebe statističke fizike, zajedno sa drugim oblastima koje sadrže nelinearnu dinamiku, u cilju rešavanja problema u ekonomiji...
PB  - Univerzitet u Beogradu, Fizički fakultet
T1  - Statistical-mechanical analysis of the evolution of national markets
T1  - Statističko-mehanička analiza evolucije nacionalnih tržišta
UR  - https://hdl.handle.net/21.15107/rcub_nardus_12244
ER  - 

@phdthesis{
author = "Sarvan, Darko",
year = "2019",
abstract = "In the very heart of this dissertation is one of the modern areas of physics - Econophysics. It uses theories and methodologies originally developed for the needs of statistical physics, along with other areas that contain nonlinear dynamics, in order to solve the problems in the economy..., U samom srcu ove disertacije je jedna od modernih oblasti fizike - Ekonofizika. U njoj se primenjuju teorije i metodologije originalno razvijane za potrebe statističke fizike, zajedno sa drugim oblastima koje sadrže nelinearnu dinamiku, u cilju rešavanja problema u ekonomiji...",
publisher = "Univerzitet u Beogradu, Fizički fakultet",
title = "Statistical-mechanical analysis of the evolution of national markets, Statističko-mehanička analiza evolucije nacionalnih tržišta",
url = "https://hdl.handle.net/21.15107/rcub_nardus_12244"
}

Sarvan, D.. (2019). Statistical-mechanical analysis of the evolution of national markets. 
Univerzitet u Beogradu, Fizički fakultet..
https://hdl.handle.net/21.15107/rcub_nardus_12244

Sarvan D. Statistical-mechanical analysis of the evolution of national markets. 2019;.
https://hdl.handle.net/21.15107/rcub_nardus_12244 .

Sarvan, Darko, "Statistical-mechanical analysis of the evolution of national markets" (2019),
https://hdl.handle.net/21.15107/rcub_nardus_12244 .

TY  - JOUR
AU  - Bianchi, Stefano
AU  - Plastino, Wolfango
AU  - Brattich, Erika
AU  - Đurđević, Vladimir
AU  - Longo, Alessandro
AU  - Hernandez-Ceballos, Miguel A.
AU  - Sarvan, Darko
AU  - Ajtić, Jelena
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1745
AB  - The activity concentrations of beryllium-7, a natural radiotracer that is considered as a tracer of the strato-spheric-tropospheric exchange, shows a distinct behaviour in Northern Europe compared to the central and southern parts of the continent. In this study, we use the measurements collected at four sampling stations in Scandinavia (Ivalo, Umea, Kista, Risoe) between 2001 and 2010 and investigate their trends, periodicities and residuals with the aim to further understand the common features in the beryllium-7 data records in northern sampling sites. The beryllium-7 activity concentrations exhibit statistically significant positive trends that range from an average value of 1.50%/year to an average value of 2.96%/year. We detect a one-year periodicity in all the sites, and in the southernmost site, Risoe in Denmark, additional higher-frequency harmonics. In the residual time series, we find outliers that represent occurrences of extremely high beryllium-7 activity concentration. Cross-correlations of the beryllium-7 residuals across the four sites decrease with increasing distance; similarly, as indicated by local Hurst exponents the records exhibit long-range correlations that weaken towards the end of the investigated period. To investigate the causes of the detected trends, we also calculate correlations between beryllium-7 and factors related to its production, transport and removal from the atmosphere: in particular, cross-correlations of the beryllium-7 residuals with residuals in sunspot number, local temperature, atmospheric pressure and precipitation, as well as Arctic Oscillation index and North Atlantic Oscillation index. Most of the obtained correlations, however, are not statistically significant, highlighting the need to analyse a longer time period in order to evaluate the impact of different factors on the airborne beryllium-7 activity concentration.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Applied Radiation and Isotopes
T1  - Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe
VL  - 148
SP  - 160
EP  - 167
DO  - 10.1016/j.apradiso.2019.03.038
ER  - 

@article{
author = "Bianchi, Stefano and Plastino, Wolfango and Brattich, Erika and Đurđević, Vladimir and Longo, Alessandro and Hernandez-Ceballos, Miguel A. and Sarvan, Darko and Ajtić, Jelena",
year = "2019",
abstract = "The activity concentrations of beryllium-7, a natural radiotracer that is considered as a tracer of the strato-spheric-tropospheric exchange, shows a distinct behaviour in Northern Europe compared to the central and southern parts of the continent. In this study, we use the measurements collected at four sampling stations in Scandinavia (Ivalo, Umea, Kista, Risoe) between 2001 and 2010 and investigate their trends, periodicities and residuals with the aim to further understand the common features in the beryllium-7 data records in northern sampling sites. The beryllium-7 activity concentrations exhibit statistically significant positive trends that range from an average value of 1.50%/year to an average value of 2.96%/year. We detect a one-year periodicity in all the sites, and in the southernmost site, Risoe in Denmark, additional higher-frequency harmonics. In the residual time series, we find outliers that represent occurrences of extremely high beryllium-7 activity concentration. Cross-correlations of the beryllium-7 residuals across the four sites decrease with increasing distance; similarly, as indicated by local Hurst exponents the records exhibit long-range correlations that weaken towards the end of the investigated period. To investigate the causes of the detected trends, we also calculate correlations between beryllium-7 and factors related to its production, transport and removal from the atmosphere: in particular, cross-correlations of the beryllium-7 residuals with residuals in sunspot number, local temperature, atmospheric pressure and precipitation, as well as Arctic Oscillation index and North Atlantic Oscillation index. Most of the obtained correlations, however, are not statistically significant, highlighting the need to analyse a longer time period in order to evaluate the impact of different factors on the airborne beryllium-7 activity concentration.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Applied Radiation and Isotopes",
title = "Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe",
volume = "148",
pages = "160-167",
doi = "10.1016/j.apradiso.2019.03.038"
}

Bianchi, S., Plastino, W., Brattich, E., Đurđević, V., Longo, A., Hernandez-Ceballos, M. A., Sarvan, D.,& Ajtić, J.. (2019). Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe. in Applied Radiation and Isotopes
Pergamon-Elsevier Science Ltd, Oxford., 148, 160-167.
https://doi.org/10.1016/j.apradiso.2019.03.038

Bianchi S, Plastino W, Brattich E, Đurđević V, Longo A, Hernandez-Ceballos MA, Sarvan D, Ajtić J. Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe. in Applied Radiation and Isotopes. 2019;148:160-167.
doi:10.1016/j.apradiso.2019.03.038 .

Bianchi, Stefano, Plastino, Wolfango, Brattich, Erika, Đurđević, Vladimir, Longo, Alessandro, Hernandez-Ceballos, Miguel A., Sarvan, Darko, Ajtić, Jelena, "Analysis of trends, periodicities, and correlations in the beryllium-7 time series in Northern Europe" in Applied Radiation and Isotopes, 148 (2019):160-167,
https://doi.org/10.1016/j.apradiso.2019.03.038 . .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Nečemer, Marijan
AU  - Todorović, Dragana
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Djurdjević, Vladimir
AU  - Vodenik, Branko
AU  - Glavič Cindro, Denis
AU  - Kožar Logar, Jasmina
AU  - Zorko, Benjamin
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2342
AB  - Activity concentrations of cosmogenic beryllium-7, terragenic lead-210 and artificial caesium-137
are closely observed within environmental radioactivity monitoring programmes in Serbia and
Slovenia. In this study, we compare the temporal evolution and seasonal cycles of the radionuclides
recorded over 1991–2015 in three locations: Belgrade (44.88333 °N; 20.583333 °E; 95 m a.s.l.), the
capital of the Republic of Serbia; Krško (45.950414 °N; 15.512261 °E; 204 m a.s.l.), a town in eastern
Slovenia, located ~400 km west of Belgrade; and Ljubljana (46.042356 °N; 14.487494 °E;
292 m a.s.l.), the capital of the Republic of Slovenia, located ~500 km west of Belgrade. The latitudes
of these three sites differ only slightly, approximately by 1°.
The similarities between the data sets are evident from their measurement ranges and long-term
means. For example, the recorded beryllium-7 activity concentrations fall within the ranges reported
for different locations in Europe. In the lead-210 series, the observed values are similar to the activity
concentrations reported for some neighbouring regions, but around twofold higher than in locations
that are under a significant maritime influence, thus removed from this radionuclide’s source. The
activity concentrations of caesium-137 at all the sites are of the same order of magnitude and agree
with the post-Chernobyl picture of the fall-out in Europe.
However, there are some noticeable differences in the seasonal cycles of these radionuclides at
the investigated sites. For example, even though the beryllium-7 seasonal cycles in all the sites exhibit
a spring/summer maximum and a winter minimum, the timing of the maximum recorded at the
Slovenian sites is agreement with other Western European sites of similar latitude in contrast to the
Belgrade site that shows an earlier occurrence of the maximum, more in line with European locations
further north.
A possible explanation for the observed dissimilarities could lie in the differences of the
meteorological patterns in the investigated sites. According to Köppen-Geiger climate classification,
Krško and Ljubljana have Warm temperate fully humid climate with warm summers (Cfb), while
Belgrade is characterised by Warm temperate fully humid climate with hot summers (Cfa). Belgrade
is located deeper in the continental landmass, and its climate has more of midlatitude continental
characteristics, in terms of higher summer temperature, more pronounced seasonal temperature
amplitude, and lower precipitation, especially during summer months. These differences in climate
affect the transport and removal of the radionuclides from the atmosphere and could lead to the
observed dissimilarities. Still, a detailed analysis of the radionuclides’ time series and their relation to
the time series of the meteorological parameters is needed to better understand their interconnexion.
PB  - Niš : Sievert Association
C3  - Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija
T1  - Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia
SP  - 27
EP  - 27
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2342
ER  - 

@conference{
author = "Ajtić, Jelena and Sarvan, Darko and Nečemer, Marijan and Todorović, Dragana and Rajačić, Milica and Krneta Nikolić, Jelena and Djurdjević, Vladimir and Vodenik, Branko and Glavič Cindro, Denis and Kožar Logar, Jasmina and Zorko, Benjamin",
year = "2019",
abstract = "Activity concentrations of cosmogenic beryllium-7, terragenic lead-210 and artificial caesium-137
are closely observed within environmental radioactivity monitoring programmes in Serbia and
Slovenia. In this study, we compare the temporal evolution and seasonal cycles of the radionuclides
recorded over 1991–2015 in three locations: Belgrade (44.88333 °N; 20.583333 °E; 95 m a.s.l.), the
capital of the Republic of Serbia; Krško (45.950414 °N; 15.512261 °E; 204 m a.s.l.), a town in eastern
Slovenia, located ~400 km west of Belgrade; and Ljubljana (46.042356 °N; 14.487494 °E;
292 m a.s.l.), the capital of the Republic of Slovenia, located ~500 km west of Belgrade. The latitudes
of these three sites differ only slightly, approximately by 1°.
The similarities between the data sets are evident from their measurement ranges and long-term
means. For example, the recorded beryllium-7 activity concentrations fall within the ranges reported
for different locations in Europe. In the lead-210 series, the observed values are similar to the activity
concentrations reported for some neighbouring regions, but around twofold higher than in locations
that are under a significant maritime influence, thus removed from this radionuclide’s source. The
activity concentrations of caesium-137 at all the sites are of the same order of magnitude and agree
with the post-Chernobyl picture of the fall-out in Europe.
However, there are some noticeable differences in the seasonal cycles of these radionuclides at
the investigated sites. For example, even though the beryllium-7 seasonal cycles in all the sites exhibit
a spring/summer maximum and a winter minimum, the timing of the maximum recorded at the
Slovenian sites is agreement with other Western European sites of similar latitude in contrast to the
Belgrade site that shows an earlier occurrence of the maximum, more in line with European locations
further north.
A possible explanation for the observed dissimilarities could lie in the differences of the
meteorological patterns in the investigated sites. According to Köppen-Geiger climate classification,
Krško and Ljubljana have Warm temperate fully humid climate with warm summers (Cfb), while
Belgrade is characterised by Warm temperate fully humid climate with hot summers (Cfa). Belgrade
is located deeper in the continental landmass, and its climate has more of midlatitude continental
characteristics, in terms of higher summer temperature, more pronounced seasonal temperature
amplitude, and lower precipitation, especially during summer months. These differences in climate
affect the transport and removal of the radionuclides from the atmosphere and could lead to the
observed dissimilarities. Still, a detailed analysis of the radionuclides’ time series and their relation to
the time series of the meteorological parameters is needed to better understand their interconnexion.",
publisher = "Niš : Sievert Association",
journal = "Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija",
title = "Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia",
pages = "27-27",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2342"
}

Ajtić, J., Sarvan, D., Nečemer, M., Todorović, D., Rajačić, M., Krneta Nikolić, J., Djurdjević, V., Vodenik, B., Glavič Cindro, D., Kožar Logar, J.,& Zorko, B.. (2019). Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia. in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija
Niš : Sievert Association., 27-27.
https://hdl.handle.net/21.15107/rcub_veterinar_2342

Ajtić J, Sarvan D, Nečemer M, Todorović D, Rajačić M, Krneta Nikolić J, Djurdjević V, Vodenik B, Glavič Cindro D, Kožar Logar J, Zorko B. Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia. in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija. 2019;:27-27.
https://hdl.handle.net/21.15107/rcub_veterinar_2342 .

Ajtić, Jelena, Sarvan, Darko, Nečemer, Marijan, Todorović, Dragana, Rajačić, Milica, Krneta Nikolić, Jelena, Djurdjević, Vladimir, Vodenik, Branko, Glavič Cindro, Denis, Kožar Logar, Jasmina, Zorko, Benjamin, "Comparison of the beryllium-7, lead-210 and caesium-137 activity concentrations in the surface air along 45 °N in Serbia and Slovenia" in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija (2019):27-27,
https://hdl.handle.net/21.15107/rcub_veterinar_2342 .

TY  - CONF
AU  - Stratimirović, Djordje
AU  - Sarvan, Darko
AU  - Hernández-Ceballos, Miguel Angel
AU  - Ajtić, Jelena
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2343
AB  - Beryllium-7, a cosmogenic radionuclide, attaches to aerosols promptly after its formation and thereon descends from the upper troposphere and lower stratosphere to the surface. At the surface, this isotope’s activity concentration is closely monitored as a part of radioactivity measurements in many countries. Since the abundance of beryllium-7 offers an insight into the processes that take place along its trajectory through the atmosphere, it is considered a tracer of air mass history. For this reason, there is an incentive to fully understand its behaviour and the mechanisms that correlate it to meteorological parameters. Our analysis, therefore, looks into one particular aspect of this question – autocorrelation properties of the beryllium-7 records that imply a manner in which this radionuclide’s activity concentration changes with time. The analysis is performed on the measurements taken at three Fenno-Scandinavian sites north of 55 °N: Helsinki (Finland), Kista (Sweden) and Risoe (Denmark), given here in order of descending latitude. The data are taken from the Radioactivity Monitoring Environmental Data Bank (REMdb) and span 1987-2013 for Helsinki, and 1995-2013 for Kista and Risoe. The Helsinki data series is longer and with a higher temporal resolution (approximately once in two days) than the Kista and Risoe series (approximately once a week). For each site, we investigate the wavelet power spectrum and look into the scaling properties of the time series, as well as its trend and periodicities. One of the results that the wavelet analysis offers is a power spectrum scaling exponent β, which is related to the decay of the autocorrelation function of a time series, and effectively points to the existence of a temporal trend. A stationary time series is regarded as long-term correlated for β between 0 and 1. Our study gives β values of 0.77, 0.56 and 0.63 for Helsinki, Kista, and Risoe, respectively. This finding implies a trend in all of the investigated beryllium-7 records, with the strongest trend detected for Helsinki. In addition, the investigated wavelet power spectra show local maxima corresponding to characteristic time intervals of the series. The most prominent peak in each spectrum points to the seasonal cycle, i.e. a periodicity of one year. A further wavelet analysis of the meteorological parameters, such as temperature and precipitation, could shed more light on their possible correlation with the beryllium-7 trends, and, in turn, these findings could allow us to evaluate this radionuclide’s full potential as an atmospheric tracer.
PB  - Niš : Sievert Association
C3  - Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija
T1  - Scaling properties of the beryllium-7 activity concentrations in the surface air in Fenno-Scandinavia
SP  - 26
EP  - 26
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2343
ER  - 

@conference{
author = "Stratimirović, Djordje and Sarvan, Darko and Hernández-Ceballos, Miguel Angel and Ajtić, Jelena",
year = "2019",
abstract = "Beryllium-7, a cosmogenic radionuclide, attaches to aerosols promptly after its formation and thereon descends from the upper troposphere and lower stratosphere to the surface. At the surface, this isotope’s activity concentration is closely monitored as a part of radioactivity measurements in many countries. Since the abundance of beryllium-7 offers an insight into the processes that take place along its trajectory through the atmosphere, it is considered a tracer of air mass history. For this reason, there is an incentive to fully understand its behaviour and the mechanisms that correlate it to meteorological parameters. Our analysis, therefore, looks into one particular aspect of this question – autocorrelation properties of the beryllium-7 records that imply a manner in which this radionuclide’s activity concentration changes with time. The analysis is performed on the measurements taken at three Fenno-Scandinavian sites north of 55 °N: Helsinki (Finland), Kista (Sweden) and Risoe (Denmark), given here in order of descending latitude. The data are taken from the Radioactivity Monitoring Environmental Data Bank (REMdb) and span 1987-2013 for Helsinki, and 1995-2013 for Kista and Risoe. The Helsinki data series is longer and with a higher temporal resolution (approximately once in two days) than the Kista and Risoe series (approximately once a week). For each site, we investigate the wavelet power spectrum and look into the scaling properties of the time series, as well as its trend and periodicities. One of the results that the wavelet analysis offers is a power spectrum scaling exponent β, which is related to the decay of the autocorrelation function of a time series, and effectively points to the existence of a temporal trend. A stationary time series is regarded as long-term correlated for β between 0 and 1. Our study gives β values of 0.77, 0.56 and 0.63 for Helsinki, Kista, and Risoe, respectively. This finding implies a trend in all of the investigated beryllium-7 records, with the strongest trend detected for Helsinki. In addition, the investigated wavelet power spectra show local maxima corresponding to characteristic time intervals of the series. The most prominent peak in each spectrum points to the seasonal cycle, i.e. a periodicity of one year. A further wavelet analysis of the meteorological parameters, such as temperature and precipitation, could shed more light on their possible correlation with the beryllium-7 trends, and, in turn, these findings could allow us to evaluate this radionuclide’s full potential as an atmospheric tracer.",
publisher = "Niš : Sievert Association",
journal = "Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija",
title = "Scaling properties of the beryllium-7 activity concentrations in the surface air in Fenno-Scandinavia",
pages = "26-26",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2343"
}

Stratimirović, D., Sarvan, D., Hernández-Ceballos, M. A.,& Ajtić, J.. (2019). Scaling properties of the beryllium-7 activity concentrations in the surface air in Fenno-Scandinavia. in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija
Niš : Sievert Association., 26-26.
https://hdl.handle.net/21.15107/rcub_veterinar_2343

Stratimirović D, Sarvan D, Hernández-Ceballos MA, Ajtić J. Scaling properties of the beryllium-7 activity concentrations in the surface air in Fenno-Scandinavia. in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija. 2019;:26-26.
https://hdl.handle.net/21.15107/rcub_veterinar_2343 .

Stratimirović, Djordje, Sarvan, Darko, Hernández-Ceballos, Miguel Angel, Ajtić, Jelena, "Scaling properties of the beryllium-7 activity concentrations in the surface air in Fenno-Scandinavia" in Book of Abstracts of the International Conference on Radiation Applications, September 16–19, 2019, Beograd, Srbija (2019):26-26,
https://hdl.handle.net/21.15107/rcub_veterinar_2343 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Djurdjević, Vladimir
AU  - Sarvan, Darko
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Zorko, Benjamin
AU  - Todorović, Dragana
PY  - 2019
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2344
AB  - Since 2015, a scientific collaboration network between the University of Belgrade, the University
of Bologna and the Radioactive Monitoring Environmental (REM) group of the European
Commission Joint Research Centre – Ispra, has addressed the characterisation of the beryllium-7
concentration in the surface air recorded across Europe, and its link with meteorological conditions.
A set of studies carried out over this period has been based on the beryllium-7 activity measurements
collected and validated by the Radioactivity Monitoring Environmental Data Bank (REMdb)
(https://rem.jrc.ec.europa.eu/RemWeb/Index.aspx). REMdb makes accessible and understandable
to a wider audience radioactivity measurements made by all European Member States in the air,
water, milk, and mixed diet. Thus, the scientific community is given research opportunities to exploit
a unique collection of almost 5 million environmental radioactivity measurements taken across
Europe since 1988. Our collaboration has also investigated other sets of multidecadal beryllium-7
activity concentrations: 1) sampled in Serbia and measured at the Vinča Institute of Nuclear Sciences,
and 2) sampled in Slovenia and measured at the Jožef Stefan Institute.
This paper compiles our current understanding of the abundance of beryllium-7, which is a
naturally occurring radionuclide, in the surface air in Europe. Beryllium-7 is produced in the upper
troposphere-lower stratosphere (UT-LS) region, where it attaches to fine aerosols and is then
transported through the atmosphere. Due to its origin, it is considered a good tracer of air mass
history, and it can be used as an indicator of different processes in the atmosphere, such as vertical
exchange across the UT-LS region. Based on a number of our previous studies, we here give an
overall picture of the beryllium-7 activity concentration distribution in Europe. We describe its
general decrease from the south of the continent towards the polar region, different periodicities and
outliers identified in the time series, and we make an effort to identify the underlying driving
mechanisms that give rise to this distribution. We also look into temporal trends that show a
statistically significant increase in the beryllium-7 surface concentration. Since temperature is one of
the major factors that influence this radionuclide’s abundance in the air, we speculate that the trends
are affected by the global increase in temperature. For that reason, we intend to further inquire into
the possibility of using the beryllium-7 surface concentration as an indicator of climate change.
PB  - Niš : RAD Centre
C3  - Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro
T1  - Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe
SP  - 9
EP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2344
ER  - 

@conference{
author = "Ajtić, Jelena and Djurdjević, Vladimir and Sarvan, Darko and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Zorko, Benjamin and Todorović, Dragana",
year = "2019",
abstract = "Since 2015, a scientific collaboration network between the University of Belgrade, the University
of Bologna and the Radioactive Monitoring Environmental (REM) group of the European
Commission Joint Research Centre – Ispra, has addressed the characterisation of the beryllium-7
concentration in the surface air recorded across Europe, and its link with meteorological conditions.
A set of studies carried out over this period has been based on the beryllium-7 activity measurements
collected and validated by the Radioactivity Monitoring Environmental Data Bank (REMdb)
(https://rem.jrc.ec.europa.eu/RemWeb/Index.aspx). REMdb makes accessible and understandable
to a wider audience radioactivity measurements made by all European Member States in the air,
water, milk, and mixed diet. Thus, the scientific community is given research opportunities to exploit
a unique collection of almost 5 million environmental radioactivity measurements taken across
Europe since 1988. Our collaboration has also investigated other sets of multidecadal beryllium-7
activity concentrations: 1) sampled in Serbia and measured at the Vinča Institute of Nuclear Sciences,
and 2) sampled in Slovenia and measured at the Jožef Stefan Institute.
This paper compiles our current understanding of the abundance of beryllium-7, which is a
naturally occurring radionuclide, in the surface air in Europe. Beryllium-7 is produced in the upper
troposphere-lower stratosphere (UT-LS) region, where it attaches to fine aerosols and is then
transported through the atmosphere. Due to its origin, it is considered a good tracer of air mass
history, and it can be used as an indicator of different processes in the atmosphere, such as vertical
exchange across the UT-LS region. Based on a number of our previous studies, we here give an
overall picture of the beryllium-7 activity concentration distribution in Europe. We describe its
general decrease from the south of the continent towards the polar region, different periodicities and
outliers identified in the time series, and we make an effort to identify the underlying driving
mechanisms that give rise to this distribution. We also look into temporal trends that show a
statistically significant increase in the beryllium-7 surface concentration. Since temperature is one of
the major factors that influence this radionuclide’s abundance in the air, we speculate that the trends
are affected by the global increase in temperature. For that reason, we intend to further inquire into
the possibility of using the beryllium-7 surface concentration as an indicator of climate change.",
publisher = "Niš : RAD Centre",
journal = "Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro",
title = "Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe",
pages = "9-9",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2344"
}

Ajtić, J., Djurdjević, V., Sarvan, D., Brattich, E., Hernández-Ceballos, M. A., Zorko, B.,& Todorović, D.. (2019). Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe. in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro
Niš : RAD Centre., 9-9.
https://hdl.handle.net/21.15107/rcub_veterinar_2344

Ajtić J, Djurdjević V, Sarvan D, Brattich E, Hernández-Ceballos MA, Zorko B, Todorović D. Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe. in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro. 2019;:9-9.
https://hdl.handle.net/21.15107/rcub_veterinar_2344 .

Ajtić, Jelena, Djurdjević, Vladimir, Sarvan, Darko, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Zorko, Benjamin, Todorović, Dragana, "Temporal and spatial distribution of the beryllium-7 activity concentration in the surface air in Europe" in Book of Abstracts of the Seventh International Conference on Radiation in Various Fields of Research, June 10–14, 2019, Herceg Novi, Montenegro (2019):9-9,
https://hdl.handle.net/21.15107/rcub_veterinar_2344 .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Sarvan, Darko
AU  - Mitrović, Branislava
AU  - Čučulović, Ana
AU  - Čučulović, Rodoljub
AU  - Frontasyeva, Marina
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1620
AB  - Instrumental neutron activation analysis is used to determine a content of 47 elements (Na, Mg, Al, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Co, Cu, Zn, As, Se, Br, Rb, Sr, Zr, Mo, Ag, Cd, Sb, I, Ba, Cs, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Tm, Yb, Lu, Hf, Ta, W, Au, Hg, Th, and U) in mosses (Homolothecium sp., Hypnum cupressiforme Hedw., and Brachythecium mildeanum (Schimp.) Schimp.) and lichen (Cladonia fimbriata (L.) Fr.) collected in three locations in Eastern Serbia over years 2006-2010. Concentrations of six elements (Zr, Nd, Gd, Tm, Yb, and Lu) in mosses in Serbia are measured for the first time. For other elements, the obtained concentrations fall within the ranges reported for mosses and lichens in Europe, but no declining trend in concentrations of V, Cd, Cr, Zn, Ni, Fe, and Cu, that has been described in the literature, can be inferred from our results. Factor analysis shows that terrigenous and industrial components are the highest contributing factors to the elemental composition and that the most polluted measurement site is in the vicinity of a copper mining and smelting complex.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology and Radiation Protection
T1  - Elemental composition of moss and lichen species in eastern Serbia
VL  - 33
IS  - 3
SP  - 275
EP  - 285
DO  - 10.2298/NTRP1803275A
ER  - 

@article{
author = "Ajtić, Jelena and Sarvan, Darko and Mitrović, Branislava and Čučulović, Ana and Čučulović, Rodoljub and Frontasyeva, Marina",
year = "2018",
abstract = "Instrumental neutron activation analysis is used to determine a content of 47 elements (Na, Mg, Al, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Co, Cu, Zn, As, Se, Br, Rb, Sr, Zr, Mo, Ag, Cd, Sb, I, Ba, Cs, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Tm, Yb, Lu, Hf, Ta, W, Au, Hg, Th, and U) in mosses (Homolothecium sp., Hypnum cupressiforme Hedw., and Brachythecium mildeanum (Schimp.) Schimp.) and lichen (Cladonia fimbriata (L.) Fr.) collected in three locations in Eastern Serbia over years 2006-2010. Concentrations of six elements (Zr, Nd, Gd, Tm, Yb, and Lu) in mosses in Serbia are measured for the first time. For other elements, the obtained concentrations fall within the ranges reported for mosses and lichens in Europe, but no declining trend in concentrations of V, Cd, Cr, Zn, Ni, Fe, and Cu, that has been described in the literature, can be inferred from our results. Factor analysis shows that terrigenous and industrial components are the highest contributing factors to the elemental composition and that the most polluted measurement site is in the vicinity of a copper mining and smelting complex.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology and Radiation Protection",
title = "Elemental composition of moss and lichen species in eastern Serbia",
volume = "33",
number = "3",
pages = "275-285",
doi = "10.2298/NTRP1803275A"
}

Ajtić, J., Sarvan, D., Mitrović, B., Čučulović, A., Čučulović, R.,& Frontasyeva, M.. (2018). Elemental composition of moss and lichen species in eastern Serbia. in Nuclear Technology and Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 33(3), 275-285.
https://doi.org/10.2298/NTRP1803275A

Ajtić J, Sarvan D, Mitrović B, Čučulović A, Čučulović R, Frontasyeva M. Elemental composition of moss and lichen species in eastern Serbia. in Nuclear Technology and Radiation Protection. 2018;33(3):275-285.
doi:10.2298/NTRP1803275A .

Ajtić, Jelena, Sarvan, Darko, Mitrović, Branislava, Čučulović, Ana, Čučulović, Rodoljub, Frontasyeva, Marina, "Elemental composition of moss and lichen species in eastern Serbia" in Nuclear Technology and Radiation Protection, 33, no. 3 (2018):275-285,
https://doi.org/10.2298/NTRP1803275A . .

TY  - JOUR
AU  - Stratimirović, Đorđe
AU  - Sarvan, Darko
AU  - Miljković, Vladimir
AU  - Blesić, Suzana
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1596
AB  - In this paper we have analyzed scaling properties and cyclical behavior of the three types of stock market indexes (SMI) time series: data belonging to stock markets of developed economies, emerging economies, and of the underdeveloped or transitional economies. We have used two techniques of data analysis to obtain and verify our findings: the wavelet transform (WT) spectral analysis to identify cycles in the SMI returns data, and the time- dependent detrended moving average (tdDMA) analysis to investigate local behavior around market cycles and trends. We found cyclical behavior in all SMI data sets that we have analyzed. Moreover, the positions and the boundaries of cyclical intervals that we found seam to be common for all markets in our dataset. We list and illustrate the presence of nine such periods in our SMI data. We report on the possibilities to differ-entiate between the level of growth of the analyzed markets by way of statistical analysis of the properties of wavelet spectra that characterize particular peak behaviors. Our results show that measures like the relative WT energy content and the relative WT amplitude of the peaks in the small scales region could be used to partially differentiate between market economies. Finally, we propose a way to quantify the level of development of a stock market based on estimation of local complexity of markets SMI series. From the local scaling exponents calculated for our nine peak regions we have defined what we named the Development Index, which proved, at least in the case of our dataset, to be suitable to rank the SMI series that we have analyzed in three distinct groups.
PB  - Elsevier Science Bv, Amsterdam
T2  - Communications in Nonlinear Science and Numerical Simulation
T1  - Analysis of cyclical behavior in time series of stock market returns
VL  - 54
SP  - 21
EP  - 33
DO  - 10.1016/j.cnsns.2017.05.009
ER  - 

@article{
author = "Stratimirović, Đorđe and Sarvan, Darko and Miljković, Vladimir and Blesić, Suzana",
year = "2018",
abstract = "In this paper we have analyzed scaling properties and cyclical behavior of the three types of stock market indexes (SMI) time series: data belonging to stock markets of developed economies, emerging economies, and of the underdeveloped or transitional economies. We have used two techniques of data analysis to obtain and verify our findings: the wavelet transform (WT) spectral analysis to identify cycles in the SMI returns data, and the time- dependent detrended moving average (tdDMA) analysis to investigate local behavior around market cycles and trends. We found cyclical behavior in all SMI data sets that we have analyzed. Moreover, the positions and the boundaries of cyclical intervals that we found seam to be common for all markets in our dataset. We list and illustrate the presence of nine such periods in our SMI data. We report on the possibilities to differ-entiate between the level of growth of the analyzed markets by way of statistical analysis of the properties of wavelet spectra that characterize particular peak behaviors. Our results show that measures like the relative WT energy content and the relative WT amplitude of the peaks in the small scales region could be used to partially differentiate between market economies. Finally, we propose a way to quantify the level of development of a stock market based on estimation of local complexity of markets SMI series. From the local scaling exponents calculated for our nine peak regions we have defined what we named the Development Index, which proved, at least in the case of our dataset, to be suitable to rank the SMI series that we have analyzed in three distinct groups.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Communications in Nonlinear Science and Numerical Simulation",
title = "Analysis of cyclical behavior in time series of stock market returns",
volume = "54",
pages = "21-33",
doi = "10.1016/j.cnsns.2017.05.009"
}

Stratimirović, Đ., Sarvan, D., Miljković, V.,& Blesić, S.. (2018). Analysis of cyclical behavior in time series of stock market returns. in Communications in Nonlinear Science and Numerical Simulation
Elsevier Science Bv, Amsterdam., 54, 21-33.
https://doi.org/10.1016/j.cnsns.2017.05.009

Stratimirović Đ, Sarvan D, Miljković V, Blesić S. Analysis of cyclical behavior in time series of stock market returns. in Communications in Nonlinear Science and Numerical Simulation. 2018;54:21-33.
doi:10.1016/j.cnsns.2017.05.009 .

Stratimirović, Đorđe, Sarvan, Darko, Miljković, Vladimir, Blesić, Suzana, "Analysis of cyclical behavior in time series of stock market returns" in Communications in Nonlinear Science and Numerical Simulation, 54 (2018):21-33,
https://doi.org/10.1016/j.cnsns.2017.05.009 . .

TY  - JOUR
AU  - Ajtić, Jelena
AU  - Brattich, Erika
AU  - Sarvan, Darko
AU  - Đurđević, V.
AU  - Hernández-Ceballos, Miguel A.
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1649
AB  - Relationships between the beryllium-7 activity concentrations in surface air and meteorological parameters (temperature, atmospheric pressure, and precipitation), teleconnection indices (Arctic Oscillation, North Atlantic Oscillation, and Scandinavian pattern) and number of sunspots are investigated using two multivariate statistical techniques: hierarchical cluster and factor analysis. The beryllium-7 surface measurements over 1995-2011, at four sampling sites located in the Scandinavian Peninsula, are obtained from the Radioactivity Environmental Monitoring Database. In all sites, the statistical analyses show that the beryllium-7 concentrations are strongly linked to temperature. Although the beryllium-7 surface concentration exhibits the well-characterised spring/summer maximum, our study shows that extremely high beryllium-7 concentrations, defined as the values exceeding the 90th percentile in the data records for each site, also occur over the October-March period. Two types of autumn/winter extremes are distinguished: type-1 when the number of extremes in a given month is less than three, and type-2 when at least three extremes occur in a month. Factor analysis performed for these autumn/winter events shows a weaker effect of temperature and a stronger impact of the transport and production signal on the beryllium-7 concentrations. Further, the majority of the type-2 extremes are associated with a very high monthly Scandinavian teleconnection index. The type-2 extremes that occurred in January, February and March are also linked to sudden stratospheric warmings of the Arctic vortex. Our results indicate that the Scandinavian teleconnection index might be a good indicator of the meteorological conditions facilitating extremely high beryllium-7 surface concentrations over Scandinavia during autumn and winter.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemosphere
T1  - Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter
VL  - 199
SP  - 278
EP  - 285
DO  - 10.1016/j.chemosphere.2018.02.052
ER  - 

@article{
author = "Ajtić, Jelena and Brattich, Erika and Sarvan, Darko and Đurđević, V. and Hernández-Ceballos, Miguel A.",
year = "2018",
abstract = "Relationships between the beryllium-7 activity concentrations in surface air and meteorological parameters (temperature, atmospheric pressure, and precipitation), teleconnection indices (Arctic Oscillation, North Atlantic Oscillation, and Scandinavian pattern) and number of sunspots are investigated using two multivariate statistical techniques: hierarchical cluster and factor analysis. The beryllium-7 surface measurements over 1995-2011, at four sampling sites located in the Scandinavian Peninsula, are obtained from the Radioactivity Environmental Monitoring Database. In all sites, the statistical analyses show that the beryllium-7 concentrations are strongly linked to temperature. Although the beryllium-7 surface concentration exhibits the well-characterised spring/summer maximum, our study shows that extremely high beryllium-7 concentrations, defined as the values exceeding the 90th percentile in the data records for each site, also occur over the October-March period. Two types of autumn/winter extremes are distinguished: type-1 when the number of extremes in a given month is less than three, and type-2 when at least three extremes occur in a month. Factor analysis performed for these autumn/winter events shows a weaker effect of temperature and a stronger impact of the transport and production signal on the beryllium-7 concentrations. Further, the majority of the type-2 extremes are associated with a very high monthly Scandinavian teleconnection index. The type-2 extremes that occurred in January, February and March are also linked to sudden stratospheric warmings of the Arctic vortex. Our results indicate that the Scandinavian teleconnection index might be a good indicator of the meteorological conditions facilitating extremely high beryllium-7 surface concentrations over Scandinavia during autumn and winter.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemosphere",
title = "Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter",
volume = "199",
pages = "278-285",
doi = "10.1016/j.chemosphere.2018.02.052"
}

Ajtić, J., Brattich, E., Sarvan, D., Đurđević, V.,& Hernández-Ceballos, M. A.. (2018). Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter. in Chemosphere
Pergamon-Elsevier Science Ltd, Oxford., 199, 278-285.
https://doi.org/10.1016/j.chemosphere.2018.02.052

Ajtić J, Brattich E, Sarvan D, Đurđević V, Hernández-Ceballos MA. Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter. in Chemosphere. 2018;199:278-285.
doi:10.1016/j.chemosphere.2018.02.052 .

Ajtić, Jelena, Brattich, Erika, Sarvan, Darko, Đurđević, V., Hernández-Ceballos, Miguel A., "Factors affecting the Be-7 surface concentration and its extremely high occurrences over the Scandinavian Peninsula during autumn and winter" in Chemosphere, 199 (2018):278-285,
https://doi.org/10.1016/j.chemosphere.2018.02.052 . .

TY  - CONF
AU  - Sarvan, Darko
AU  - Todorović, Dragana
AU  - Rajačić, Milica
AU  - Krneta Nikolić, Jelena
AU  - Djurdjević, Vladimir
AU  - Zorko, Benjamin
AU  - Vodenik, Branko
AU  - Glavič Cindro, Denis
AU  - Kožar Logar, Jasmina
AU  - Ajtić, Jelena
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2346
AB  - Cosmogenic beryllium-7 (Be-7) and a long-lived radon progeny lead-210 (Pb-210) are radionuclides commonly measured in the environmental radioactivity programmes. Although their production mechanisms and points of entry into the atmosphere differ, there is a strong interconnection between their behaviour since they are transported through the atmosphere attached to aerosols. Thus, their abundance is governed by the atmospheric processes and both are considered good tracers of air mass origin. In this paper, we use the Be-7and Pb-210 specific activities measured in Serbia and Slovenia to investigate the degree of their similarities across a distance of about 500 km. Specifically, in an attempt to distinguish major influencing mechanisms, we apply factor analysis to the radionuclides’ measurements conducted over 1991–2015 in Belgrade, Serbia, and Ljubljana and Krško, both in Slovenia. The factor analysis also includes the following meteorological parameters at each sampling site: temperature, cloud cover, relative humidity, precipitation and atmospheric pressure (not available at the Krško site). The results of the factor analysis show that the communalities of only two factors are already larger than 0.5 for most of the variables. The exceptions are the atmospheric pressure in Belgrade and precipitation in both Belgrade and Ljubljana. The factor loadings of two factors show that: 1) the Be-7 specific activity, temperature, cloud cover and relative humidity are encompassed by factor 1 in all the sites; while 2) the Pb-210 specific activity is described by factor 2 together with atmospheric pressure in Belgrade and Ljubljana, but with precipitation in Krško (where atmospheric pressure is not available). These results imply that the Be-7 and Pb-210 are under different dominant underlying mechanisms. Over the investigated 24 years, both the Be-7 and Pb-210 measurements across the three sites show a very good agreement in the measurement ranges and overall means. However, a closer examination of the differences in the data time series reveal an exception to this general agreement – during 2005– 2012, there is a pronounced increase in radionuclides’ concentrations in Ljubljana and Krško, relative to Belgrade. Therefore, factor analysis is also performed for this shorter time period. The obtained factor loadings show a change in the influence of the major two factors. Compared to 1991–2015, the influence of factor 2 on Be-7 increases in Belgrade and decreases in Ljubljana. On the other hand, an influence of factor 1 on Pb-210 decreases in Belgrade, but increases in Ljubljana and Krško. These opposing changes might explain the relatively high differences in the radionuclides’ concentrations seen over 2005–2012.
PB  - Niš : RAD Association
C3  - 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
T1  - Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015
SP  - 185
EP  - 185
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2346
ER  - 

@conference{
author = "Sarvan, Darko and Todorović, Dragana and Rajačić, Milica and Krneta Nikolić, Jelena and Djurdjević, Vladimir and Zorko, Benjamin and Vodenik, Branko and Glavič Cindro, Denis and Kožar Logar, Jasmina and Ajtić, Jelena",
year = "2018",
abstract = "Cosmogenic beryllium-7 (Be-7) and a long-lived radon progeny lead-210 (Pb-210) are radionuclides commonly measured in the environmental radioactivity programmes. Although their production mechanisms and points of entry into the atmosphere differ, there is a strong interconnection between their behaviour since they are transported through the atmosphere attached to aerosols. Thus, their abundance is governed by the atmospheric processes and both are considered good tracers of air mass origin. In this paper, we use the Be-7and Pb-210 specific activities measured in Serbia and Slovenia to investigate the degree of their similarities across a distance of about 500 km. Specifically, in an attempt to distinguish major influencing mechanisms, we apply factor analysis to the radionuclides’ measurements conducted over 1991–2015 in Belgrade, Serbia, and Ljubljana and Krško, both in Slovenia. The factor analysis also includes the following meteorological parameters at each sampling site: temperature, cloud cover, relative humidity, precipitation and atmospheric pressure (not available at the Krško site). The results of the factor analysis show that the communalities of only two factors are already larger than 0.5 for most of the variables. The exceptions are the atmospheric pressure in Belgrade and precipitation in both Belgrade and Ljubljana. The factor loadings of two factors show that: 1) the Be-7 specific activity, temperature, cloud cover and relative humidity are encompassed by factor 1 in all the sites; while 2) the Pb-210 specific activity is described by factor 2 together with atmospheric pressure in Belgrade and Ljubljana, but with precipitation in Krško (where atmospheric pressure is not available). These results imply that the Be-7 and Pb-210 are under different dominant underlying mechanisms. Over the investigated 24 years, both the Be-7 and Pb-210 measurements across the three sites show a very good agreement in the measurement ranges and overall means. However, a closer examination of the differences in the data time series reveal an exception to this general agreement – during 2005– 2012, there is a pronounced increase in radionuclides’ concentrations in Ljubljana and Krško, relative to Belgrade. Therefore, factor analysis is also performed for this shorter time period. The obtained factor loadings show a change in the influence of the major two factors. Compared to 1991–2015, the influence of factor 2 on Be-7 increases in Belgrade and decreases in Ljubljana. On the other hand, an influence of factor 1 on Pb-210 decreases in Belgrade, but increases in Ljubljana and Krško. These opposing changes might explain the relatively high differences in the radionuclides’ concentrations seen over 2005–2012.",
publisher = "Niš : RAD Association",
journal = "6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia",
title = "Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015",
pages = "185-185",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2346"
}

Sarvan, D., Todorović, D., Rajačić, M., Krneta Nikolić, J., Djurdjević, V., Zorko, B., Vodenik, B., Glavič Cindro, D., Kožar Logar, J.,& Ajtić, J.. (2018). Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
Niš : RAD Association., 185-185.
https://hdl.handle.net/21.15107/rcub_veterinar_2346

Sarvan D, Todorović D, Rajačić M, Krneta Nikolić J, Djurdjević V, Zorko B, Vodenik B, Glavič Cindro D, Kožar Logar J, Ajtić J. Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia. 2018;:185-185.
https://hdl.handle.net/21.15107/rcub_veterinar_2346 .

Sarvan, Darko, Todorović, Dragana, Rajačić, Milica, Krneta Nikolić, Jelena, Djurdjević, Vladimir, Zorko, Benjamin, Vodenik, Branko, Glavič Cindro, Denis, Kožar Logar, Jasmina, Ajtić, Jelena, "Behaviour of the beryllium-7 and lead-210 time series measured in Serbia and Slovenia over 1991-2015" in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia (2018):185-185,
https://hdl.handle.net/21.15107/rcub_veterinar_2346 .

TY  - CONF
AU  - Ajtić, Jelena
AU  - Brattich, Erika
AU  - Hernández-Ceballos, Miguel Angel
AU  - Sarvan, Darko
AU  - Djurdjević, Vladimir
PY  - 2018
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2347
AB  - Beryllium-7 is a cosmogenic radionuclide that, due to its maximum production in the stratosphere and upper troposphere, has often been used as a tracer of vertical transport processes in the atmosphere. In particular, high concentrations of surface airborne beryllium-7 could be a result of an uncommonly fast descent of air masses from the stratosphere into the troposphere. Hence, our aim is to investigate the maxima in the beryllium-7 surface concentrations to better understand the processes associated with the downward transport from the stratosphere to the troposphere. Fourteen locations in Europe, with latitudes ranging between 37 °N and 69 °N, and longitudes between 6 °W and 28 °E, are analysed in our study. Over the 2001–2010 period, the beryllium-7 surface concentration measurements in the chosen sites were performed mostly once a week, giving a total of about 500 data points per each site. The data are contained within the online Radioactivity Environmental Monitoring (REM) Database. We define the beryllium-7 maxima as values exceeding the 95th percentile calculated for each site. Over 2001–2010, 345 maxima are identified for the investigated 14 sites, out of which 61 maxima (18 %) occurred during three consecutive months: May, June and July 2006. Over this period, i.e. summer 2006, the contribution of detected maxima to the total number of maxima for each site ranged between 4 % and 32 %, with six sites showing a contribution of 20 % or larger. This number of extremely high beryllium-7 specific activities concentrated over only three months marks this period as unique. In an attempt to identify underlying mechanisms that are associated with this exceptional episode of high beryllium-7 surface concentrations, we look into the potential vorticity, surface temperature and pressure, and precipitation maps over the region of interest during the time window when the extremes were observed.
PB  - Niš : RAD Association
C3  - 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
T1  - Extremely high beryllium-7 surface concentrations in Europe: a case study
SP  - 169
EP  - 169
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2347
ER  - 

@conference{
author = "Ajtić, Jelena and Brattich, Erika and Hernández-Ceballos, Miguel Angel and Sarvan, Darko and Djurdjević, Vladimir",
year = "2018",
abstract = "Beryllium-7 is a cosmogenic radionuclide that, due to its maximum production in the stratosphere and upper troposphere, has often been used as a tracer of vertical transport processes in the atmosphere. In particular, high concentrations of surface airborne beryllium-7 could be a result of an uncommonly fast descent of air masses from the stratosphere into the troposphere. Hence, our aim is to investigate the maxima in the beryllium-7 surface concentrations to better understand the processes associated with the downward transport from the stratosphere to the troposphere. Fourteen locations in Europe, with latitudes ranging between 37 °N and 69 °N, and longitudes between 6 °W and 28 °E, are analysed in our study. Over the 2001–2010 period, the beryllium-7 surface concentration measurements in the chosen sites were performed mostly once a week, giving a total of about 500 data points per each site. The data are contained within the online Radioactivity Environmental Monitoring (REM) Database. We define the beryllium-7 maxima as values exceeding the 95th percentile calculated for each site. Over 2001–2010, 345 maxima are identified for the investigated 14 sites, out of which 61 maxima (18 %) occurred during three consecutive months: May, June and July 2006. Over this period, i.e. summer 2006, the contribution of detected maxima to the total number of maxima for each site ranged between 4 % and 32 %, with six sites showing a contribution of 20 % or larger. This number of extremely high beryllium-7 specific activities concentrated over only three months marks this period as unique. In an attempt to identify underlying mechanisms that are associated with this exceptional episode of high beryllium-7 surface concentrations, we look into the potential vorticity, surface temperature and pressure, and precipitation maps over the region of interest during the time window when the extremes were observed.",
publisher = "Niš : RAD Association",
journal = "6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia",
title = "Extremely high beryllium-7 surface concentrations in Europe: a case study",
pages = "169-169",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2347"
}

Ajtić, J., Brattich, E., Hernández-Ceballos, M. A., Sarvan, D.,& Djurdjević, V.. (2018). Extremely high beryllium-7 surface concentrations in Europe: a case study. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia
Niš : RAD Association., 169-169.
https://hdl.handle.net/21.15107/rcub_veterinar_2347

Ajtić J, Brattich E, Hernández-Ceballos MA, Sarvan D, Djurdjević V. Extremely high beryllium-7 surface concentrations in Europe: a case study. in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia. 2018;:169-169.
https://hdl.handle.net/21.15107/rcub_veterinar_2347 .

Ajtić, Jelena, Brattich, Erika, Hernández-Ceballos, Miguel Angel, Sarvan, Darko, Djurdjević, Vladimir, "Extremely high beryllium-7 surface concentrations in Europe: a case study" in 6th International Conference on Radiation and Applications in Various Fields of Research (RAD), Book of Abstracts, Jun 18-22, 2018, Ohrid, Macedonia (2018):169-169,
https://hdl.handle.net/21.15107/rcub_veterinar_2347 .

TY  - CONF
AU  - Mitrović, Branislava
AU  - Ajtić, Jelena
AU  - Vranješ, Borjana
AU  - Sarvan, Darko
AU  - Andrić, Velibor
AU  - Stojanović, Mirjana
PY  - 2017
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2349
AB  - Natural radionuclides are present in mineral water as a result of geochemical processes that
influence its final composition. The quality of mineral water varies and, apart from the natural disasters
such as droughts and floods, it is also affected by industrial activities. The aim of our investigation is
to determine the activity concentrations of 40K, 238U, 226Ra and 232Th in mineral waters available at the
Serbian market. Nine samples of carbonated mineral water and five samples of non-carbonated natural
spring water, collected during 2016, are analyses by standard gamma spectrometry. The maximum 40K
specific activity measured in the samples is 3.6 Bq/l, while the 238U, 226Ra and 232Th specific activities
are below minimal detectable activity. These results show that according to the national regulations,
all samples are radiologically safe for human consumption.
PB  - Niš : RAD Association
C3  - Book of Abstracts of the Fifth International Conference on Radiation and Applications in Various Fields of Research, June 12–16, 2017, Budva, Montenegro
T1  - Natural radionuclides in bottled mineral water at the Serbian market
SP  - 273
EP  - 273
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2349
ER  - 

@conference{
author = "Mitrović, Branislava and Ajtić, Jelena and Vranješ, Borjana and Sarvan, Darko and Andrić, Velibor and Stojanović, Mirjana",
year = "2017",
abstract = "Natural radionuclides are present in mineral water as a result of geochemical processes that
influence its final composition. The quality of mineral water varies and, apart from the natural disasters
such as droughts and floods, it is also affected by industrial activities. The aim of our investigation is
to determine the activity concentrations of 40K, 238U, 226Ra and 232Th in mineral waters available at the
Serbian market. Nine samples of carbonated mineral water and five samples of non-carbonated natural
spring water, collected during 2016, are analyses by standard gamma spectrometry. The maximum 40K
specific activity measured in the samples is 3.6 Bq/l, while the 238U, 226Ra and 232Th specific activities
are below minimal detectable activity. These results show that according to the national regulations,
all samples are radiologically safe for human consumption.",
publisher = "Niš : RAD Association",
journal = "Book of Abstracts of the Fifth International Conference on Radiation and Applications in Various Fields of Research, June 12–16, 2017, Budva, Montenegro",
title = "Natural radionuclides in bottled mineral water at the Serbian market",
pages = "273-273",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2349"
}

Mitrović, B., Ajtić, J., Vranješ, B., Sarvan, D., Andrić, V.,& Stojanović, M.. (2017). Natural radionuclides in bottled mineral water at the Serbian market. in Book of Abstracts of the Fifth International Conference on Radiation and Applications in Various Fields of Research, June 12–16, 2017, Budva, Montenegro
Niš : RAD Association., 273-273.
https://hdl.handle.net/21.15107/rcub_veterinar_2349

Mitrović B, Ajtić J, Vranješ B, Sarvan D, Andrić V, Stojanović M. Natural radionuclides in bottled mineral water at the Serbian market. in Book of Abstracts of the Fifth International Conference on Radiation and Applications in Various Fields of Research, June 12–16, 2017, Budva, Montenegro. 2017;:273-273.
https://hdl.handle.net/21.15107/rcub_veterinar_2349 .

Mitrović, Branislava, Ajtić, Jelena, Vranješ, Borjana, Sarvan, Darko, Andrić, Velibor, Stojanović, Mirjana, "Natural radionuclides in bottled mineral water at the Serbian market" in Book of Abstracts of the Fifth International Conference on Radiation and Applications in Various Fields of Research, June 12–16, 2017, Budva, Montenegro (2017):273-273,
https://hdl.handle.net/21.15107/rcub_veterinar_2349 .