Прегледај по Аутор "Pecelj, Milica"
Сада се приказује 1 - 10 од 10
Резултати по страници
Опције сортирања
- СтавкаAN EVALUATION OF SUMMER DISCOMFORT IN NIŠ (SERBIA) USING HUMIDEX(Geographical Institute “Jovan Cvijić” SASA (Serbian Academy of Sciences and Arts), 2019) Lukić, Milica; Pecelj, Milica; Protić, Branko; Filipović, DejanThe bioclimatic analysis of the central area of the city of Niš conducted in this paper is based on the use of the bioclimatic index Humidex, which represents subjective outdoor temperature that one feels in warm and humid environment. The purpose of this research is to observe the index change on a daily basis during the hottest part of the year (June, July, and August) over the period from 1998 to 2017. For the purposes of this analysis, hourly (7:00, 14:00), maximum and mean daily values of meteorological parameters (air temperature and relative humidity) were used, for the period of 20 years (1998–2017), which were measured at Niš weather station (43°19'N, 21°53'E, at an altitude of 202 meters). The findings indicate a gradual change in the bioclimatic characteristics of this area during this period, especially over the last decade. After 2007 there has been a decrease in the total number of the days described as “comfortable”. However, there has been an increase in the index values in all the other heat stress categories characterized by a higher or lower degree of thermal discomfort. The years 1998, 2000, 2003, 2007, 2011, 2016, 2015, and 2017 stand out as adverse years
- СтавкаAssessment of Outdoor Thermal Comfort in Serbia’s Urban Environments during Different Seasons(MDPI, 2021) Lukić, Milica; Filipović, Dejan; Pecelj, Milica; Crnogorac, Ljiljana; Lukić, Bogdan; Divjak, Lazar; Lukić, Ana; Vučićević, AnaThe urban microclimate is gradually changing due to climate change, extreme weather conditions, urbanization, and the heat island effect. In such an altered environment, outdoor thermal comfort can have a strong impact on public health and quality of life in urban areas. In this study, three main urban areas in Serbia were selected: Belgrade (Central Serbia), Novi Sad (Northern Serbia), and Niš (Southern Serbia). The focus was on the temporal assessment of OTC, using the UTCI over a period of 20 years (1999–2018) during different seasons. The main aim is the general estimation of the OTC of Belgrade, Novi Sad, and Niš, in order to gain better insight into the bioclimatic condition, current trends and anomalies that have occurred. The analysis was conducted based on an hourly (7 h, 14 h, and 21 h CET) and “day by day” meteorological data set. Findings show the presence of a growing trend in seasonal UTCI anomalies, especially during summer and spring. In addition, there is a notable increase in the number of days above the defined UTCI thresholds for each season. Average annual UTCIs values also show a positive, rising trend, ranging from 0.50 C to 1.33 C. The most significant deviations from the average UTCI values, both seasonal and annual, were recorded in 2000, 2007, 2012, 2015, 2017, and 2018.
- СтавкаBiothermal conditions on Mt. Zlatibor based on thermophysiological indices(Institute for Biological Research, Serbia, 2017) Pecelj, Milica; Đorđević, Aleksandar; Pecelj, Milovan R.; Pecelj-Purković, Jelena; Filipović, Dejan; Šećerov, VelimirThis paper presents part of the research in the field of human bioclimatology and refers to biothermal conditions in different geographical environments in Serbia: an urban area and a mountain of medium height. The goal of the paper was to show bioclimatic differences during the summer between the city of Belgrade (116 m a.s.l.) and the mountain resort of Zlatibor (1498 m a.s.l.). The basic principle of bioclimatic analysis is the human heat balance between man and environment. This methodological approach is a combination of physiological and meteorological parameters that result in thermophysiological bioclimatic indices: heat load (HL) in man and the Universal Thermal Climate Index (UTCI). For this analysis, weather data for July, as the warmest month, was obtained, using daily meteorological data for the decade from 2000 to 2010. Results for July indicate a considerable difference between the two abovementioned environments. HL in Belgrade was dominated by degrees of comfort “hot” and “extremely hot, with the highest value of 4.540, while for Zlatibor the dominant degree of comfort was “warm”. The UTCI in Belgrade has dominated by strong heat stress and moderate heat stress, compared to Zlatibor where the UTCI is dominated by moderate heat stress. In addition, a significant part of the monitored decade on Mt. Zlatibor was without heat stress, with the exception of 2006 and 2007, indicating favorable biothermal characteristics. Therefore, compared to Belgrade, with its considerably lower overall heat stress Zlatibor has the characteristics of a site with favorable bioclimatic qualities.
- СтавкаEnvironmental Suitability of the City of East Sarajevo for the Location of Municipal Solid Waste Disposal Site Using a GIS Based Multi-Criteria Analysis(2022) Šušnjar, Sanda; Golijanin, Jelena; Pecelj, Milica; Lukić Tanović, Mariana; Valjarević, AleksandarWorld production growth affected a rise in the amount of waste generated. In these circumstances proper waste management becomes a highly important issue. The protection of the environment from degradation requires a multi-dimensional approach to this problem. Integration of multicriteria decision making with the geographic information systems provides a useful methodology and a helpful instrument in waste management, particularly in the assessment of environmental suitability for the location of municipal solid waste disposal sites. Multidimensional approach is realized through analytic hierarchy process (AHP) in the determination of sub-criteria and criteria values and final site selection. Geographic information systems (GIS) provide spatial data input and give an insight into final result of the decision-making process. Integrated methodology is applied in suitability analysis of the City of East Sarajevo for the location of municipal solid waste disposal site (MSWDS). Ten criteria were evaluated through pair-wise comparison matrices and suitability map was obtained using weighted linear combination algorithm in GIS. Extracting high suitability area, the largest locations were evaluated through AHP according to ten criteria and final site selection was made. The results indicate high applicability of integrated multi-criteria analysis and GIS methodologies for coordination of decision-making process in spatially oriented issues of environmental management
- СтавкаLong-Term Assessment of Bioclimatic Conditions at Micro and Local Scales in the Cities of theWestern Part of the Balkan Peninsula during the 21st Century(MDPI, 2023) Ðurđević, Dejana; Vasić, Milica; Ogrin, Matej; Savić, Stevan; Milošević, Dragan; Dunjić, Jelena; Šećerov, Ivan; Žgela, Matej; Boras, Marijana; Herceg Bulić, Ivana; Pecelj, Milica; Šušnjar, Sanda; Lukić, Milica; Ivanišević, Marko; Trbić, Goran; Ćulafić, Golub; Mitrović, LukaThermal comfort assessments at local or micro-scales within urban areas can provide crucial insights for the urban adaptation strategies pertaining to climate-conscious urban planning and public health. However, the availability of long-term or mid-term daily or hourly meteorological data sets from urban environments remains a significant challenge even in the 21st century. Consequently, this study aimed to assess the thermal conditions in cities across the western part of the Balkan Peninsula, encompassing five countries (Slovenia, Croatia, Serbia, Bosnia and Herzegovina, and Montenegro), by utilizing the Physiological Equivalent Temperature (PET) index. Meteorological data sets, comprising air temperature, relative humidity, wind speed, and cloudiness, were collected from 32 national meteorological stations/measurement locations spanning the period from 2001 to 2020. The PET calculations were conducted based on meteorological data measured three times per day (7 a.m., 2 p.m., and 9 p.m.). Upon conducting a spatial analysis of the meteorological stations, it was observed that most of them (25 stations) were situated within built-up areas or urban suburbs, rendering them highly relevant for local or micro-scale climate and bioclimate assessments. The findings revealed that urban locations exhibited slightly higher PET heat stress levels, particularly during the summer season and at 2 p.m. Moreover, higher average PET values were observed in both urban and non-urban stations situated within a continental climate during warmer periods, such as summer. In contrast, during the colder seasons, namely winter and spring, higher PET values were prevalent in the Mediterranean region. Furthermore, the PET frequency analysis revealed a greater prevalence of extreme and severe heat stress levels in stations within continental climates, particularly those located in urban areas, as compared to stations in Mediterranean climates. In contrast, during the winter and spring seasons, monitoring stations in close proximity to the Adriatic Sea, characterized by a Mediterranean climate, exhibited significantly lower levels of cold stress compared to inland stations. Evidently, in addition to the climatic characteristics and surrounding terrain, the urban morphology significantly impacts the thermal conditions within cities.
- СтавкаTemporal Analysis of Urban-Suburban PET, mPET and UTCI Indices in Belgrade (Serbia)(MDPI, 2021) Pecelj, Milica; Matzarakis, Andreas; Vujadinović, Mirjam; Radovanović, Milan; Vagić, Nemanja; Ðurić, Dijana; Cvetkovic, MilenaThe analysis of the bioclimatic conditions is becoming increasingly relevant in climate interpretations for human needs, particularly in spatial planning, tourism, public health, sports events, bio-prognosis, etc. In this context, our study presents general temporal bioclimatic conditions in Belgrade, defined based on the PET, mPET and UTCI heat budget indices. Monthly, seasonal and annual indices were analyzed for urban and suburban weather stations based on 43 annual sets of meteorological data obtained by hourly observations at 7 h and 14 h CET. This study aims to present the distribution of PET, mPET and UTCI indices to show the pattern of each index in a mild climate location and to examine annual and seasonal differences of each index in the Belgrade urban center and suburban part of the city. The study results indicate higher biothermal stress in the urban area compared to the suburban zone and that the indices are congruent during the summer. At the same time, during the winter, they are more difficult to compare due to their peculiarities becoming more noticeable. The results obtained of all mean monthly and mean annual values of all three indices clearly indicate the difference that follows the definition of the urban heat island (UHI), particularly those from morning observation and winter season. The UTCI index shows the most significant monthly, seasonal and annual difference between urban and suburban areas for both observations. The annual difference of DUTCI7h amounts to 1.5 C is the same as the annual difference of minimum temperatures (Dtmin). In contrast, the annual differences of DPET7h DmPET7h are smaller (0.8 C and 0.7 C) and closer to the annual differences of maximum temperatures Dtmax amounted of 0.6 C.
- СтавкаTHE ASSESSMENT OF HUMAN BIOCLIMATE OF VRANJE HEALTH RESORT (SERBIA) BASED ON UNIVERSAL THERMAL CLIMATE INDEX (UTCI) WITH THE FOCUS ON EXTREME BIOTHERMAL CONDITIONS(2021) Pecelj, Milica; Błażejczyk, Anna; Vagić, Nemanja; Ivanović, PecaThe study deals with an assessment and interpretation of the bioclimatic conditions in Vranje (southern Serbia). The study aims at temporal distributions of bioclimatic conditions focussing on extreme thermal stress based on the Universal Thermal Climate Index (UTCI). The meteorological data required for the calculation of UTCI concern hourly (7 and 14 CET) weather data collected for the period 2000-2017. The frequency of very strong heat stress (VSHS), very strong cold stress (VSCS) and extreme cold stress (ECS) for both morning and midday hours. Furthermore, the daily difference of the UTCI hourly values (diurnal UTCI change) are specified, giving the daily variance of heat and cold stress. The results revealed the frequency of days in which thermal stress prevails for the studied period. The obtained results show an increase in extreme heat biothermal conditions, while extreme cold biothermal conditions are in decline, especially in the last 10 years. However, the frequency (the number of days) of very strong heat stress (VSHS) increased since 2007. A spectacular increase in heat stress was observed in the month of September, particularly in 2015.
- СтавкаThe role of potassium channels and calcium in the relaxation mechanism of magnesium sulfate on the isolated rat uterus(Serbian Biological Society, 2019) Sokolović, Dragana; Drakul, Dragana; Oreščanin Dušić,; Tatalović, Nikola; Pecelj, Milica; Milovanović, Slobodan; Blagojević, DuškoMgSO4 is used as a tocolytic agent. It is considered to be a calcium channel antagonist, but a different mechanism of its action might be involved. The aim of this study was to examine the contribution of calcium concentrations and potassium channels in the mechanism of MgSO4-mediated uterine relaxation. Isolated uteri from female Wister rats were treated with increasing MgSO4 concentrations (0.1-30 mM). MgSO4 induced dose-dependent inhibition of spontaneous activity. Addition of Ca2+ (6 mM and 12 mM) stimulated uterine contractile activity and attenuated the inhibitory activity of MgSO4. In order to analyze the role of different subtypes of potassium channels, Ca2+-stimulated uteri were pretreated with glibenclamide (Glib), a selective ATP-sensitive potassium channel inhibitor (KATP), tetraethylammonium (TEA), a non-specific inhibitor of large conductance calcium-activated potassium channels (BKCa), and 4-aminopyridine (4-AP), a voltage-sensitive potassium channel inhibitor (Kv), at concentrations that had no effect per se. Pretreatment with 4-AP had no effect on MgSO4-mediated relaxation of Ca2+-stimulated uteri. The relaxing effect of MgSO4 was potentiated by pretreatment with glibenclamide. Pretreatment with TEA attenuated the MgSO4-mediated decrease in frequency. Our results suggest that MgSO4 acts as a general calcium antagonist that influences Ca2+-mediated potassium channels. Furthermore, it seems that MgSO4 uterine relaxation activity is partially mediated by selective ATP sensitive potassium channels, suggesting an ATP-dependent role.
- СтавкаThermal assessments at local and micro scales during hot summer days: a case study of Belgrade (Serbia)(2024) Savić, Stevan; Milovanović, Boško; Milošević, Dragan; Dunjić, Jelena; Pecelj, Milica; Lukić, Milica; Ostojić, Miloš; Fekete, RenataIncreasing thermal risk in cities is endangering the health and well-being of urban population and is driven by climate change and intensive urbanization. Therefore, if we plan to enlarge the capacities of cities to be more climate resilient in the 21st century, more detailed monitoring of urban climate on local and micro scales is needed. For this research we performed two microclimate measurement campaigns in urban area of Belgrade, during hot summer days in 2021. In total, five measurement sites were chosen in different urban designs and different local climate zones (LCZs). For thermal monitoring (air temperature – Ta and globe temperature – Tg) the Kestrel heat stress tracker sensor with 1-min measurement resolution was used, but we used 10-min average values. Obtained results showed distinct thermal differences (up to 7 °C on average) between densely built-up areas and green areas. Differences between built-up LCZs are lower with values from 2 to 4 °C. Important part of this research was microclimate monitoring on sites within the same LCZ (intra-LCZ variability). Results showed that shadows and short- and longwave radiation play a paramount role in thermal variability. Direct and reflected radiations on one measurement site increased Ta up to 6 °C and Tg up to 12 °C when compared to other measurement site (in a similar urban design), which was in the shadow.
- СтавкаWeather suitability for outdoor tourism in three European regions in first decades of the twenty-first century(Springer, 2021) Błażejczyk, Anna; Pecelj, Milica; Skrynyk, Oleh; Krzysztof, Błażejczyk; Skrynyk, OlesyaOutdoor tourism and recreational activities strongly depend on actual meteorological conditions. Traditionally, in three studied regions, the peak of tourists’ streams concentrates in summer months. In the present study, we assess suitability of weather conditions for various forms of outdoor tourism in different regions of Serbia, Poland and Ukraine. Additionally, how the location of the station differentiates temporal patterns of weather suitability will be discussed. To analyse the suitability of weather conditions for various forms of outdoor recreation, we have chosen 23 meteorological stations of the national weather networks which represent different tourism areas and destinations. For each weather station, daily data for the period 2000–2017 of air temperature, relative humidity, total cloud cover and wind speed (at 10 m above ground) for 12 UTC as well as the daily maximum and minimum temperature, precipitation totals and snow cover depth were applied. Suitability of climate for outdoor recreation and tourism is assessed by the Weather Suitability Index (WSI) based on Błażejczyk’s bio-thermal weather classification. The results of research show that passive forms of recreation (sun and air bathing) are preferred mostly in months from May till August or September. For the active forms of recreation, weather in summer months is very oppressive, especially in the resorts located in the south (Serbia, southern Ukraine). Active forms of recreation are preferred there in autumn, winter and spring months