Претрага
950 items
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Overview of brown coal reserves in Banovići basin in accordance with PERC reporting standard
Damir Baraković, Kasim Modrić, Vladimir Simić. "Overview of brown coal reserves in Banovići basin in accordance with PERC reporting standard" in Tehnika, Centre for Evaluation in Education and Science (CEON/CEES) (2021). https://doi.org/10.5937/tehnika2102157B
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Short-term forecasting of PM10 and PM2.5 concentrations with Facebook's Prophet Model at the Belgrade-Zeleno brdo
Filip Arnaut, Vesna Cvetkov, Dragana Đurić, Mileva Samardžić-Petrović. "Short-term forecasting of PM10 and PM2.5 concentrations with Facebook's Prophet Model at the Belgrade-Zeleno brdo" in Geofizika (2023). https://doi.org/10.15233/gfz.2023.40.7
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A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenikaGordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević. "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, Elsevier BV (2021). https://doi.org/10.1016/j.marpetgeo.2021.105383
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Availability as a dimension of energy security in the Republic of Serbia
Boban Pavlović, Dejan Ivezić (2016)There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...... indicators, energy security Introduction The increase of world population, along with the growth of quality of life, certain- ly leads to increasing demand for energy. Consumers around the world are facing with the problem of security of supply, volatility of energy prices, environmental degradation ...
... nature of energy security is the starting point of various scientific studies dealing with energy issues [1]. In many of these studies, availability of energy is pointed out as the most important dimension and with the greatest influence on the overall energy security [1-7]. In essence, availability ...
... one and the same concept has different forms under different conditions. Energy security has traditionally been associated with the securing of access to oil supplies and with impending fossil fuel depletion [3]. Today, International Energy Agency (IEA) defines energy security as the uninterrupted ...Boban Pavlović, Dejan Ivezić. "Availability as a dimension of energy security in the Republic of Serbia" in Thermal Science, National Library of Serbia (2016). https://doi.org/10.2298/TSCI160923303P
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Funkcionisanje i uticaj epikarsta na režim, bilans i kvalitet podzemnih voda istočnog dela karstnog sistema Suve planine
Branislav Z. Petrović (2020)Epikarst je deo karstne izdani koji se nalazi u okviru nadizdanske zone i predstavlja kompleksnu tačku dodira i mešanja nekonsolidovanog materijala sa površine terena, ostataka karbonatnih stena izmenjenih korozivnim delovanjem vode, živog sveta i njihovih ostataka, koja je delimično zasićena podzemnom vodom. Kompletan sud o stepenu razvoja i prisustva epikarsta na nekom krečnjačkom terenu moguće je doneti uz multidisciplinarna i obavezna detaljna hidrogeološka istraživanja. Poligon za sprovedena istraživanja je bio karstni masiv Suve planine, koja u geološkom i geografskom smislu ...epikarst, karstni sistem, podzemne vode, procesi samoprečišćavanja, hidrohemijski i mikrobiološki procesi u podzemnoj vodiBranislav Z. Petrović. Funkcionisanje i uticaj epikarsta na režim, bilans i kvalitet podzemnih voda istočnog dela karstnog sistema Suve planine, Beograd : [B. Petrović], 2020
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Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support
Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović. "Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support" in Journal of Vibroengineering (2017). https://doi.org/10.21595/jve.2016.17321
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Effectiveness Analysis of Different Bucket-wheel Excavators
Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić. "Effectiveness Analysis of Different Bucket-wheel Excavators" in 8th International Conference Mining and Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)
Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović. "Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)" in Materials, MDPI AG (2024). https://doi.org/10.3390/ma17040820
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Scanning Electron Microscopy Coupled with Energy Dispersive Spectrometric Analysis Reveals for the First Time Weddellite and Sylvite Crystals on the Surface of Involucral Bracts and Petals of two Xeranthemum L. (Compositae) Species
Milan Gavrilović, Suzana Erić, Petar Marin, Núria Garcia-Jacas, Alfonso Susanna, Pedja Janaćković (2017)Milan Gavrilović, Suzana Erić, Petar Marin, Núria Garcia-Jacas, Alfonso Susanna, Pedja Janaćković. "Scanning Electron Microscopy Coupled with Energy Dispersive Spectrometric Analysis Reveals for the First Time Weddellite and Sylvite Crystals on the Surface of Involucral Bracts and Petals of two Xeranthemum L. (Compositae) Species" in Microscopy and Microanalysis 23 no. 3, :Cambridge University Press (2017): 679-686
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Common barbel (Barbus barbus) as a bioindicator of surface river sediment pollution with Cu and Zn in three rivers of the Danube River Basin in Serbia.
Arian Morina, Filis Morina, Vesna Đikanović, Slađana Spasić, Jasmina Krpo-Ćetković, Bojan Kostić, Mirjana Lenhardt (2015)Arian Morina, Filis Morina, Vesna Đikanović, Slađana Spasić, Jasmina Krpo-Ćetković, Bojan Kostić, Mirjana Lenhardt. "Common barbel (Barbus barbus) as a bioindicator of surface river sediment pollution with Cu and Zn in three rivers of the Danube River Basin in Serbia." in Environmental Science And Pollution Research 23 no. 7, :Springer (2015): 6723-6734. https://doi.org/10.1007/s11356-015-5901-9
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Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine
Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić. "Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945617
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Flotability of chalcopyrite from the Rudnik deposit
Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...Đurica Nikšić, Predrag Lazić, Milena Kostović. "Flotability of chalcopyrite from the Rudnik deposit" in Journal of Mining Science, Springer Verlag (2021). https://doi.org/10.1134/S1062739121030170
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Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine
Orange single crystals of new polymeric cobalt(II) complex {[Co(bipy)(H2O)4]2[Co(μ-mell)(H2O)2]·10H2O}n, 1, were synthesized by slow evaporation method at room temperature (bipy = 2,2′-bipyridine, mell = hexaanion of mellitic acid) and its crystal structure was determined by single-crystal X-ray diffraction. The complex 1 was characterized based on elemental analysis, FTIR spectroscopy and thermal (TG/DTA) analysis followed by computational analysis of noncovalent interactions and quantum chemical calculations of interaction energies. In 1, two crystallographically different Co(II) atoms adopt a deformed octahedral geometry, ...Lidija Radovanović, Dušan P. Malenov, Marko V. Rodić, Aleksandar Kremenović, Jelena Rogan. "Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine" in Journal of Molecular Structure, Elsevier BV (2021). https://doi.org/10.1016/j.molstruc.2021.132202
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Phase relations and physical indicators of municipal waste from old landfills in Serbia
Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science... measurements (excavation of exploration pit at the landfili with measurement of volume and weight of excavated waste), measurements on samples from exploration boreholes, geodetic surveying of geometry and calculation of landfill volume with knowing the mass of disposed waste, nuclear methods, measuring ...
... values that range in wide interval (y =3 – 17 kN/mš). As a rule, higher values were measured at landfills with larger and more often use of earth materials for daily overlays and at landfills with higher content of water (filtrate). Municipal waste composition also greatly influences on average unit ...
... the complex nature of municipal waste structure (within the individual components of waste material is an interspace filled with landfill leachate, landfill gas or with gas and leachate, cither free or 'captured” gas), porosity (m) can be analysed as secondary porosity (porosity within particles) ...Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić. "Phase relations and physical indicators of municipal waste from old landfills in Serbia" in Japanese Geotechnical Society Special Publication, The Japanese Geotechnical Society (2021). https://doi.org/10.3208/jgssp.v09.cpeg016
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Coal homogenization stockyard sizing “Tamnava – Zapad” case study
... piles. When the stockyard is connected with a port or commercial stockyard, every pile contains coal of consistent and known quality, and blending coals of various qualities produces the quality the customer demands. However, when the stockyard is connected with a mine (pit), it is used for homogenization ...
... (2015) modelled a stockpile as a grid of voxels (octants), associated with machine operations.Their 3D quality embedded model can be used to calculate, plan, control and predict the quality of ore being stacked and/or reclaimed with a great degree of accuracy. Robinson (2004) presents mathematical ...
... the deposit with a simulation of transport- and blending models of mining operation. Beretta, et al (2010) used geostatistical simulation for reducing coal quality attributes variability using properly designed blending piles. These models allow assessing the uncertainty associated with the attributes ...Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer. "Coal homogenization stockyard sizing “Tamnava – Zapad” case study" in Proceedings of 13th International Symposium Continuous Surface Mining, ISCSM 2016, / (2016)
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Results of comprehensive monitoring activities on Umka landslide, Belgrade, Serbia
Biljana Abolmasov, Uroš Đurić (2021)... described as complex landslide within the stiff fissured Miocene (M3 2) clayey marls. Landslide is active, with various phases of deceleration and acceleration, which are mostly in correlation with the Sava river level rise/drawdown, respectively, whereas landslide velocity is characterized as slow ...
... Umka landslide were well defined by previous geotechnical investigations (Ćorić et al. 2016; Abolmasov et al. 2012). This landslide is fan-shaped, with the length along the slope of 900 m, 1650 m wide in the toe, reaching maximum depth of sliding surface at 26 m, and average slope gradient of 9 . ...
... composed of several techniques introduced for landslide monitoring: automated GNSS monitorong network, geodetic benchmark survey monitoring, UAV imaging with photogrammetric processing and analysis, and PSInSAR data processing and analysis. Common to all implemented monitoring techniques is to measure ...Biljana Abolmasov, Uroš Đurić . "Results of comprehensive monitoring activities on Umka landslide, Belgrade, Serbia" in 3rd European Regional Conference of IAEG/ Athens/ Greece/ 6-10 October 2021, IAEG National Group Greece (2021)
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Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia
Maja Milošević, Bojan Kostić (2022)... fraction <1 μm (56.1%) with a 9.5% <2 μm, representing a total clay content (65.5%). Coarse grain fraction (>20 μm) is present in a total of 10.5%. When the clay, silt and sand content were plotted on the triangular diagram, it was concluded that the sample is sandy clay with low porosity and low ...
... of 52.95% SiO2, 17.79% Al2O3, 1.02% K2O, 2.92% FeO, 6.34% CaO and 1.17% MgO, with a lower content of MnO (0.70%), Na2O (0.08%), TiO2 (0.35%) and BaO (0.03%). Higher values of the SiO2/Al2O3 mass ratios (2.97) together with LOI of 16%, CEC (84.5 mmol/100g) and SSA (661.8 m2*g–1) indicate a higher content ...
... content of montmorillonite. Infrared spectrophotometry determined that the composition corresponds to a high content of montmoril- lonite clay with peaks at 3620 cm–1, 3420 cm–1, 1632 cm–1 and 1018 cm–1. The peaks at 1444 cm–1 and 873 cm–1 correspond to carbonate minerals, although in a very small ...Maja Milošević, Bojan Kostić. "Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia" in Abstracts XXII International Congress of the Carpathian Balkan Geological Association (CBGA), September 7–11, 2022 Plovdiv, Bulgaria, Софиа : Геологически институт „Акад. Страшимир Димитров“ (2022)
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Geochronological and geochemical studies on crystalline rocks from the central Serbo-Macedonian massif with implications on its pre-Alpine evolution
Antić Milorad, Peytcheva Irena, Von Quadt Albrecht, Kounov Alexandre, Trivić Branislav, Serafimovski Todor, Tasev Goran, Gerdjikov Ianko (2014)Antić Milorad, Peytcheva Irena, Von Quadt Albrecht, Kounov Alexandre, Trivić Branislav, Serafimovski Todor, Tasev Goran, Gerdjikov Ianko. "Geochronological and geochemical studies on crystalline rocks from the central Serbo-Macedonian massif with implications on its pre-Alpine evolution" in Proceedings of the XX CBGA Congress, Tirana, Albania, 23 – 29 September 2014 Jan-14, Tirana, Albania:Buletini i Shkencave Gjeojoglike (2014): 195-195
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Black limestone with black cherts of lower cretaceous age in northern Carpatho-Balkanides (East Serbia, between Žagubica and Mali Krš)
Vasić Nebojša, Ljubović Obradović Darivojka, Justin Van der Torn, Srećković Batoćanin Danica, Davidović Dragana, Avramović Branislav (2014)Vasić Nebojša, Ljubović Obradović Darivojka, Justin Van der Torn, Srećković Batoćanin Danica, Davidović Dragana, Avramović Branislav. "Black limestone with black cherts of lower cretaceous age in northern Carpatho-Balkanides (East Serbia, between Žagubica and Mali Krš)" in Оптимално истраживање и одрживо коришћење геолошких ресурса : зборник радова XVI конгреса геолога Србије, Donji Milanovac, 22-25.05.2014. = Optimal Reserach and Sustainable Usage of the Geological Resources : proceedings of the XVI Serbian Geologcal, Donji Milanovac:Srpsko geološko društvo (2014): 279-280
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Multicriteria Analysis and Optimization of Groundwater Control Systems with Variable Values of Criterion over Predefined Time Points
Milica Stepanović, Dragoljub Bajić, Dušan Polomčić. "Multicriteria Analysis and Optimization of Groundwater Control Systems with Variable Values of Criterion over Predefined Time Points" in Comptes rendus de l'Académie Bulgare des Sciences, "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences (2021). https://doi.org/10.7546/CRABS.2021.08.09