Приказано за аутора "Valjarević, Aleksandar"
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Application of Mann-Kendal (MK) test in trend analysis of air temperature and precipitation: Case of Mačva district (Serbia)
Milentijević, Nikola; Bačević, Nikola; Ristić, Dušan; Valjarević, Aleksandar; Pantelić, Milana; Kićović, Dušan (2020-06-30)Recent climate changes cause significant natural and socio-economic consequences. They represent one of the major environmental problems of the late 20th and early 21st centuries. Changes in temperature and precipitation ... -
Assessment of air temperature and precipitation trends: case study of Mačva (Serbia)
Milentijević, Nikola; Bačević, Nikola; Valjarević, Aleksandar; Radaković, Milica; Pantelić, Milana (University of Novi Sad, Faculty of Sciences, Department of Geography, Tourism and Hotel Management, Novi Sad, 2021-09-29)Recent climate change causes significant natural and socio-economic consequences. Global climate changes are caused by natural processes and anthropogenic factor. They represent one of the major environmental problems of ... -
Assessment of observed and projected climate changes in Bačka (Serbia) using trend analysis and climate modeling
Milentijević, Nikola; Valjarević, Aleksandar; Bačević, Nikola; Ristić, Dušan; Kalkan, Kristina; Cimbaljević, Marija; Dragojlović, Jovan; Savić, Stevan; Pantelić, Milana (Hungarian Meteorological Service, 2022-03-08)Climate change is one of the largest environmental issues causing hydroclimatological extremes such as floods, droughts, and aridity. The aim of this study is to assess the observed and projected climate changes in Bačka ... -
Environmental radioactivity with respect to geology of some Serbian spas
Gulan, Ljiljana; Valjarević, Aleksandar; Milenković, Biljana; Stevanović, Vladica; Milić, Gordana; Stajić, Jelena M. (Springer, 2018-05-17)This study was performed in order to investigate gamma dose rates, radon exhalation rates and soil radioactivity with respect to geology. Fifteen locations in three Serbian spas were under investigation. Gamma dose rate ... -
Environmental risk assessment of radioactivity and heavy metals in soil of Toplica region, South Serbia
Stevanović, Vladica; Gulan, Ljiljana; Milenković, Biljana; Valjarević, Aleksandar; Zeremski, Tijana; Penjišević, Ivana (Springer, 2018-03-13)Activity levels of natural and artificial radionuclides and content of ten heavy metals (As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn and Hg) were investigated in 41 soil samples collected from Toplica region located in the south ... -
GIS analysis of land cover changes on the territory of the Prokuplje municipality
Valjarević, Aleksandar; Živković, Dragica; Valjarević, Dragana; Stevanović, Vladica; Golijanin, Jelena (Hindawi, 2014-01-03)The monitoring of the territory of Prokuplje Municipality was done based on 1 : 25,000 topographic maps in three different time periods (1969, 1974, and 1984) and land cover map in 2012. Analogous topographic maps done in ... -
A GIS-based method for analysis of a better utilization of thermal-mineral springs in the municipality of Kursumlija (Serbia)
Valjarević, Aleksandar; Srećković-Batoćanin, Danica; Valjarević, Dragana; Matović, Vesna (Elsevier, 2018-09-02)There are about 240 geothermal occurrences with 60 commercial spas included in, which are spread throughout the territory of Serbia. The majority of springs and other surface manifestations are located along the south-eastern ... -
An Improved Modification of Accelerated Double Direction and Double Step-Size Optimization Schemes
Petrović, Milena J.; Valjarević, Dragana; Ilić, Dejan; Valjarević, Aleksandar; Mladenović, Julija (MDPI, 2022-01-13)We propose an improved variant of the accelerated gradient optimization models for solving unconstrained minimization problems. Merging the positive features of either double direction, as well as double step size accelerated ... -
Radionuclides and Metals in the Parks of the City of Belgrade, Serbia: Spatial Distribution and Health Risk Assessment.
Gulan, Ljiljana; Stajic, Jelena M.; Zeremski, Tijana; Durlević, Uroš; Valjarević, AleksandarIn urban areas, forest patches and parks are usually the places where people spend most of their time outdoors. Due to the poor environmental protection policy and insufficient investment in industry and energy, Serbia is ... -
Spa environments in central Serbia: Geothermal potential, radioactivity, heavy metals and PAHs
Gulan, Ljiljana; Penjišević, Ivana; Stajic, Jelena M.; Milenković, Biljana; Zeremski, Tijana; Stevanović, Vladica; Valjarević, AleksandarThis study aims to estimate geothermal potential, radioactivity levels, and environmental pollution of sixmost popular spas in Central Serbia (Ovcar, Gornja Trepca, Vrnjacka, Mataruska, Bogutovacka and Sokobanja), as well ...