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468 items
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A necessary and sufficient condition for an algebraic integer to be a Salem number
Dragan Stankov (2019)We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "A necessary and sufficient condition for an algebraic integer to be a Salem number" in Journal de theorie des nombres de Bordeaux (2019). https://doi.org/10.5802/jtnb.1076
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Defining location and dip of magnetic anomaly sources applying mathematical transformation
It is significant to define the location and dip of anomaly sources during the geophysical exploration (magnetic, gravity, electric, seismic, etc.). In this paper we presented results obtained during magnetic survey. Applying different method of mathematical transformations on magnetic data we can find the position (edge) and dip of magnetic anomaly sources. For successful solution of this problem, we used combination two method tilt derivative and upward continuation. The study area located in the eastern Serbia, north part of ...Snežana Ignjatović, Milanka Negovanović. "Defining location and dip of magnetic anomaly sources applying mathematical transformation" in 53nd International October Conference on Mining and Metallurgy, IOC 2022, Bor, 3-5. oktobar 2022., Mining and Metallurgy Institute Bor (2022)
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Properties of fly ash and slag from the power plants
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method... material. It falls through the latticed stokehole and is rapidly cooled and extinguished in water. The fly ash and slag landfills in Serbia occupy an area of 1639 ha and if they are under constant control and monitoring, significantly influence the dis- ruption of the environment, which is reflected ...
... possibility of fly ash and slag application as a construction substitute thus preservinglimited reserves of natural building materials. 2. STUDY AREA PPNT A is the most important producer of electricity in Serbia and is built on the bank of the river Sava. PPNT A is 4 km from Obrenovac, PPNT B ...
... The Kolubara lignite basin is economically one of the most important coal basins in Serbia. It is located about 60km SSW of Belgrade, and covers an area of almost 600km2, extending in an E-W direction for up to 55km, and in the N-S direction up to 15km. This basin is divided into several fields („A” ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Properties of fly ash and slag from the power plants" in Geologia Croatica, Zagreb : Croatian Geological Survey (2016). https://doi.org/10.4154/gc.2016.26
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Палеомагнетски резултати из Тимочког магматског комплекса, Источна Србија
... бања‐Борско језеро, 9‐Брестовац, 10‐Оштрељ, 11‐Доња Бела река, 12‐нови пут Бор‐Зајечар, 13‐Стрмен. Figure 1. Simplified geological map of the studied area (after Banješević, 2010) with paleomagnetic sampling localities. Legend: 1: Campanian‐Maastrichtian sediments, 2: plutonites, 3: Senonian and ...
... ian and ended by deposition of reef sediments and conglomerates and sandstones in Upper Campanian‐ Maastrichtian. The volcanic activity in the area started in Upper Turonian and ended in Upper Campa‐ 750 nian. Durring this period the volcanic activity produced various calk‐alkaline ...
... samples were collected. The samples were oriented in situ with the magnetic and/or sun compass. The principal aim was to find out if the studied area was involved in a large scale displacement during or after the time covered by the samples. METHODS The samples were cut into standard‐size ...Весна Лесић, Емо Мартон, Драган Лукић, Весна Цветков. "Палеомагнетски резултати из Тимочког магматског комплекса, Источна Србија" in Knjiga apstrakata 17. Kongres geologa Srbije, Vrnjačka Banja 17-20. maj 2018., Српско геолошко друштво (2018)
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From post-disaster landslides inventory to open landslides data
Biljana Abolmasov, Miloš Marjanović, Uroš Đurić, Jelka Krušić. "From post-disaster landslides inventory to open landslides data" in Proceedings of 3rd European Regional Conference of IAEG/ Athens/ Greece/ 6-10 October 2021, International Association for Engineering Geology and the Environment (2021)
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The correlation of Upper Miocene lithostratigraphic units of the southern part of the Pannonian basin
Filip Anđelković, Dejan Radivojević (2019)... Banat (Serbia), southeastern parts of Hungary (Great Hungarian Plain), as well as some parts of Croatia (Slavonian mountains and Hrvatsko zagorje area). The described lithostratigraphic units are on the level of formations and members and are characterized by their lithological concent, depositional ...
... Mațenco, L., & Radivojević, D., (2012). On the formation and evolution of the Pannonian Basin: constraints derived from the structure of the junction area between the Carpathians and the Dinarides. Tectonics. 31, TC6007 8. Radivojević, D., (2019). Pannonian Basin, Pannonian Basin System and Pannonian ...Filip Anđelković, Dejan Radivojević. "The correlation of Upper Miocene lithostratigraphic units of the southern part of the Pannonian basin" in Knjiga sažetaka i radova II Kongresa geologa Bosne i Hercegovine, Laktaši BiH, oktobar 2-4, 2019, Udruženje geologa u Bosni i Hercegovini (2019)
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Actual contamination of the Danube and Sava rivers at Belgrade (2013)
Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening... Herzegovina and Serbia. The Sava River Basin covers a catchment area of 95 719 km2, which is approximately 40 % of the countries’ combined total surface area and it is the source of more than 80 % of the total available freshwater in the area. Only a few publications have considered contamination ...
... ACTUAL CONTAMINATION OF SAVA AND DANUBE 1171 The River Danube is the second longest river in Europe with a length of about 2 800 km.13 Its catchment area covers 801 500 km2, with approximately 81 million inhabitants in 19 countries.14 The Danube flows through four capitals (Vienna, Budapest, Bratislava ...
... system. To the best of our knowledge this approach has been ignored as far as possible in environmental geochemical studies in the Danube Basin catchment area. EXPERIMENTAL Sampling Water samples. River water samples were taken during two different sampling cam- paigns in January and February 2013 ...Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer. "Actual contamination of the Danube and Sava rivers at Belgrade (2013)" in Journal of the Serbian Chemical Society, National Library of Serbia (2014). https://doi.org/10.2298/JSC131105014A
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Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)
Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović. "Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)" in Carbonates and Evaporites, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s13146-019-00548-6
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Reducing environmental impact caused by mining activities in limestone mines
Radmila Gaćina, Bojan Dimitrijević (2022)Mining and its related activities have always resulted in changes in the environment and these changes can vary from one area to another. As a result of mining, several types of changes can be distinguished: destruction of land and existing vegetation, changes in terrain topography, modification in air quality, changes in surface and groundwater quality, as well as change geotechnical conditions of the rock. Environmental impact of mining have been a public concern. There is widespread global interest in mining ...Radmila Gaćina, Bojan Dimitrijević. "Reducing environmental impact caused by mining activities in limestone mines" in Underground mining engineering , Belgrade : University of Belgrade - Faculty of Mining and Geology (2022)
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Geomechnical research for the new bucket wheel excavator testing at Open pit “Filijala”
Since 1976 cement marl excavation at open-pit mine „Filijala” is carried out by continuous exploitation technology using bucket wheel excavator SH 400 manufactured by Orenstein und Koppel (O & K) company. Due to the bucket wheel excavator time-worn and high operating cost it was necessary to replace it with new one. In order to test the new bucket wheel excavator and prove its capacity a testing zone was defined as test block for excavation, in which the bucket wheel ...Vladimir Čebašek, Nebojša Gojković, Veljko Rupar, Miodrag Pribićević. "Geomechnical research for the new bucket wheel excavator testing at Open pit “Filijala”" in Рударски гласник, Рударски институт - Београд (2020). https://doi.org/10.25075/BM.2020.07
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The analysis of the geothermal energy capacity for power generation in Serbia
Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)... heat may be used either for heating or for cultivation in an area exceeding 5 ha. On the basis of calculation for available heat amount, the authors concluded that geothermal water could be used either for heating or for cultivation on the area bigger than 5 ha. Milanovi} et al. [5, 6] develop geothermal ...
... heat may be used either for heating or for cultivation in an area exceeding 5 ha. On the basis of calculation for available heat amount, the authors concluded that geothermal water could be used either for heating or for cultivation on the area bigger than 5 ha. Milanovic et al. [5, 6] develop geothermal ...
... Boreholes, Geothermics, 37 (2008), 6, pp. 565-585 [18] Martinovi}, M., et al., Possibility of Electricity Production from Hydrogeothermal Resources in the Area of Surdulica Granitoid Massif (in Serbian), Proceedings, XIV Serbian Hydrogeological Symposium, Zlatibor, Serbia, 2012, pp. 203-208 [19] Martinovi} ...Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk. "The analysis of the geothermal energy capacity for power generation in Serbia" in Thermal Science, National Library of Serbia (2013). https://doi.org/10.2298/TSCI120215033S
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Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4
Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan. "Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4 " in XIV Conference of chemists, technologists and environmentalists of Republic of Srpska, Academy of sciences and arts of the Republic of Srpska, Banja Luka, Republic of Srpska, B&H, October 21st-22nd, 2022, University in Banjaluka, Faculty of Technology (2022)
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Утицај реактивираних раседа на развој крашког процеса: примери из Карпато-балканида источне Србије
Ана Младеновић (2022)Carpatho-Balkanides represent part of the complex Dinaric-Carpatho-Balkan orogenic system, that geomorphologically dominates the central part of the Balkan peninsula. The existence of this orogenic system is a result of closure of the Neotethys ocean and subsequent convergence of the Adriatic microplate and the Eurasian continent, that has been still active in the recent times. Such geodynamic characteristics conditioned complex tectonic structures, multiply reactivated during Late Cretaceous and Cenozoic. The main aim of this research is to determine impact of ...Ана Младеновић. "Утицај реактивираних раседа на развој крашког процеса: примери из Карпато-балканида источне Србије" in Карст 2022: Значај, стање и перспективе коришћења и заштите ресурса у карсту, Српска академија наука и уметности (2022)
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Uticaj reaktiviranih raseda na razvoj kraškog procesa: primeri iz Karpato-balkanida istočne Srbije
Ana Mladenović (2022)Carpatho-Balkanides represent part of the complex Dinaric - Carpatho - Balkan orogenic system, that geomorphologically dominates the central part of the Balkan peninsula. The existence of this orogenic system is a result of closure of the Neotethys ocean and subsequent convergence of the Adriatic microplate and the Eurasian continent, that has been still active in the recent times. Such geodynamic characteristics conditioned complex tectonic structures, multiply reactivated during Late Cretaceous and Cenozoic. The main aim of this research is ...Ana Mladenović. "Uticaj reaktiviranih raseda na razvoj kraškog procesa: primeri iz Karpato-balkanida istočne Srbije" in Knjiga apstrakata multidisciplinarne konferencije "Karst 2022 - Značaj, stanje i perspektive korišćenja i zaštite resursa u karstu", Beograd : Srpska akademija nauka i umetnosti (2022)
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Introduction to special section: Characterization of hydrocarbon and geothermal resource potential and carbon sequestration opportunities of the Pannonian Basin
Balázs Németh, Gábor Tari, Gábor Bada, Dejan Radivojević, Bruno Tomljenovic, Csaba Krézsek. "Introduction to special section: Characterization of hydrocarbon and geothermal resource potential and carbon sequestration opportunities of the Pannonian Basin" in Interpretation, AAPG SEG (2018). https://doi.org/10.1190/INT-2017-1207-SPSEINTRO.1
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Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations
The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija... middle Miocene Cerna and Timok faults of the South and Serbian Carpathians, located to the east and south-east of the study area (Fig. 1b). To the south of the study area, such low-offset strike-slip deformation was documented away from the Cerna and Timok faults, in the internal Serbian Carpathians ...
... May 3, 2021; accepted in revised form September 6, 2021; Associate Editor: Rastislav Vojtko) Abstract: The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events ...
... mountains belongs to the Ser- bo-Macedonian and Supragetic Unit of the Dacia tectonic Mega-Unit (Kräutner & Krstić 2002, 2003) and thus repre- sents a key area where the contact between these two units can be studied at the surface in their northern segments. However, the geometry and kinematics of this contact ...Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković . "Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations" in Geologica Carpathica, Central Library of the Slovak Academy of Sciences (2021). https://doi.org/https://doi.org/10.31577/GeolCarp.72.5.3
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Stratigraphy and Microfauna (Radiolarians and Foraminifera) of the Upper Cretaceous (Upper Santonian–Lower Campanian) Carbonate Deposits in the Area of Struganik Village, Western Serbia)
Santonian, Campanian, radiolarians, planktonic foraminifera, biostratigraphy, limestones, Struganik, SerbiaLiubov Bragina, Nikita Bragin, Luidmila Kopaevich, Nevenka Đerić, Nataša Gerzina Spajić. "Stratigraphy and Microfauna (Radiolarians and Foraminifera) of the Upper Cretaceous (Upper Santonian–Lower Campanian) Carbonate Deposits in the Area of Struganik Village, Western Serbia)" in Stratigraphy and Geological Correlation, Pleiades Publishing Ltd (2020). https://doi.org/10.1134/S0869593820010037
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Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian-Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)
Milica Mrdak, Eva Wagerer, Milan Sudar, Nevenka Djerić, Martin Đaković, Hans-Jürgen Gawlick. "Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian-Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)" in Geologica Carpathica, Central Library of the Slovak Academy of Sciences (2024). https://doi.org/10.31577/GeolCarp.2023.26
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Uniaxial compressive strength test before and after standard fire test on rock mass
Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)... size. There are also fragments of carbonate rocks, which do not differ from other grains in size and shape. The mentioned diversity indicates a wider area of erosion from different types of rocks which, due to various factors, disintegrated, giving the mentioned clasts. Muscovite is less presented ...
... strength. Test results are shown in Table 1. Table 1. Uniaxial Compressive Strength Sample Sample Mass [gr] Dimensions [cm] Base Area [cm2] Force [kN] Uniaxial Compressive Strength [MPa] 1 889,25 6,98x6,99x6,89 48,79 390 80 2 856,58 6,85x6,87x6,98 47,06 184 39 ...
... strength of samples that were not exposed to fire depends on internal structure of samples, since dimensions of samples, their weight and surface area are approximately equal. Testing uniaxial compressive strength of samples (7-12) after standard fire test was not possible because samples ...Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović. "Uniaxial compressive strength test before and after standard fire test on rock mass" in Fifth symposium of the Macedonian Association for Geotechnics, Ohrid, North Macedonia, 23-25. 06. 2022, Macedonian Association for Geotechnics (2022)
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Hypogene karst associated with igneous intrusions and its influence on the subsequent karst evolution in high mountains (Central Andes, Peru)
Carbonate rocks of Cretaceous age are wide spread in the Peruvian Andes. The studied area in the eastern part of the Cordillera Occidental, near a large igneous intrusion and a skarn deposit, exemplifies polygenetic and multi-phase karst development. Hypogene karstification is related to a hydrothermal activity associated with a magmatic event at ca. 11-9.7 Ma responsible for the emplacement of the nearby intrusion and related alteration of the carbonate rocks. It has resulted in deep-rooted, laterally isolated stair-case-rising shaft ...Alexander B. Klimchouk, Saša Milanović, Cristian Bittencourt. "Hypogene karst associated with igneous intrusions and its influence on the subsequent karst evolution in high mountains (Central Andes, Peru)" in Conference: 21st International Congress of Speleology, France, June 2021, France : ICS (2021)