Претрага
2436 items
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Флотабилност халкопирита из полиметаличне руде рудника „Рудник”
Ђурица Н. Никшић (2022)The doctoral dissertation Chalcopyrite flotability from polymetallic "Rudnik" mine ore consists of two parts. The first part is a general part in which the theoretical foundations of the flotation concentration process, the flotation properties of chalcopyrite, the influence of certain flotation reagents and the mechanism of action on the flotation properties of chalcopyrite are presented. This part also describes the process of flotation concentration of polymetallic ore from the "Rudnik" mine. The second part is ...Ђурица Н. Никшић. Флотабилност халкопирита из полиметаличне руде рудника „Рудник”, Београд : [Ђ. Никшић], 2022
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Determining seismic hazard in slowly deforming region: Can we gather enough information from karst caves?
Ана Младеновић, Јелена Ћалић (2021)... seismic hazard in any region vary depending on the regional seismicity, butcan be roughly grouped into two main groups: one based on probabilistic methods that use dataabout known seismicity in the region, and another, which is based on data related to the faultingprocesses and determination of seismically ...
... and deformations on the field surface are very difficult, butinvestigations of neotectonically active faults inside the karst caves can give a lot moreinformation. In this abstract, we present evidence about the youngest and recently active faults in the region ofinterest, based on data from karst caves ...
... to the main thrust system. It is suspectedthat some of these fault systems are also active in recent times. Relatively complex geological structure and existence of a large number of rock discontinuities, aswell as relatively long time during which these geological units have been exposed on the surface ...Ана Младеновић, Јелена Ћалић. "Determining seismic hazard in slowly deforming region: Can we gather enough information from karst caves?" in EGU General Assembly 2021, European Geosciences Union (2021). https://doi.org/10.5194/egusphere-egu21-8723
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Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US
Even in the third decade of the 21st century, large power plants are still responsible for more than half of the electricity production in Europe and US. They predominantly use fossil fuels in their work, which results in the emission of pollutants into the air, soil and water. In addition to the production of electric energy, fossil fuels, including coal, are used for industrial purposes. Although the use of coal, especially in the countries of the European Union, is ...... large industrial plants in the EU-27 countries are emitters of various pollutants from fossil fuels. In order to mitigate the impact on the environment, EU policy aims to reduce emissions from such plants, which gives results already in the first years of the change in the use of energy [1, 2, 4]| ...
... in EU-27 a US Nevertheless, based on the strategic orientations of development, as well as on the basis of the balance sheet data, it is noticeable that renewable energy sources take precedence. While coal remains a primary fuel in the European energy mix, the transition to cleaner forms of energy ...
... impact on rising standards. Such is the case with Serbia. In 1990, the share of coal in the production of electricity was 72,6%, while in 2021 this share was 64.1%. In the same period from 1990 to 2021, electricity production decreased by 4% [11, 12]. Electricity production in USA follows the trend ...Uroš Djorgovski, Aleksandar Madžarević, Predrag Jovančić. "Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US" in International Conference on Global Energy and Climate Change - ICGRECC-23, New York, 2023, Research Galery- Science Leagues (2023)
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An intelligent hybrid system for surface coal mine safety analysis
Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić. "An intelligent hybrid system for surface coal mine safety analysis" in Engineering Applications of Artificial Intelligence (2010)
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The Impact Assessment of NO2 Emission from District Heating Plant on Local Air Quality, the Case of Zemun, Belgrade
The Belgrade district heating system relies on fossil fuels in heat production, where natural gas has the largest share of around 95% and fuel oil with around 4.4%. The Zemun heating plant is completely fueled with fuel oil. Currently, it is the largest plant that is not fueled with natural gas. The objective of this paper is to assess the impact of NO2 from the Zemun heating plant on local air quality by analyzing and comparing the concentration of ...NO2, Zagađenje vazduha, Kvalitet vazduh na lokalnom nivou, Model disperzije, AERMOD, Daljinsko grejanje, BeogradBoban Pavlović, Uroš Pantelić, Marija Živković, Dejan Ivezić. "The Impact Assessment of NO2 Emission from District Heating Plant on Local Air Quality, the Case of Zemun, Belgrade" in Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, 10.10.-15.10.2021., University of Zagreb, Zagreb, Croatia; Instituto Superior Técnico, Lisbon, Portugal (2021)
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Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic
This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композицијаMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović. "Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic" in Energies, MDPI AG (2022). https://doi.org/10.3390/en15186786
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Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina
Tina Dašić, Ljiljana Vasić (2020)Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary ChangeTina Dašić, Ljiljana Vasić. "Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-08987-4
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Хазард од клизишта у Србији у 21. веку
Biljana Abolmasov (2019)... and their techniques depend on the choice of w complexity of the case, i.e. the type of the landslide phenomena a of analysis. According to the Fifth Report of the Intergovernmental Panel o Change, an increase in the frequency and the intensity of extreme ra in the south-eastern Europe. Among different ...
... segments and their techniques depend on the choice of complexity of the case, i.e. the type of the landslide phenomen. of analysis. According to the Fifth Report of the Intergovernmental Pane Change, an increase in the frequency and the intensity of extreme in the south-eastern Europe. Among different ...
... SCIENCES AND ARTS LECTURE SERIES Book 5 GEOHAZARD IN SERBIA IN THE 21 CENTURY � KNOWLEDGE IS THE BEST BASTION AGAINST THE NATURAL DISASTERS Accepted at the 4 � meeting of the Department of Mathematics, Physics and Geosciences on 24 May 2019 E d i t o r VLADICA CVETKOVI� Corresponding Member ...Biljana Abolmasov. "Хазард од клизишта у Србији у 21. веку" in Геохазард у Србији у 21. веку – знање је најбољи бедем против стихије, Српска академија наука и уметности (2019)
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Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs
Saša Milanović, Ljiljana Vasić (2021)Saša Milanović, Ljiljana Vasić. "Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs" in Hydrogeology Journal, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10040-020-02280-1
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Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households
The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...... to consider the operational period of HSs for a specific living space. The operating energy consumption of HSs is calculated by using data from the available Energy Agency of the Republic of Serbia’s (AERS) report on the comparative costs of housing heating in the annual report [17]. The AERS’s methodology ...
... compared to the best available models in the European market. To estimate the amount of fuel needed for one heating season, it is used AERS’s data on the average efficiency of HSs and the lower heating value (LHV) (net calorific value) of each fuel. It is assumed that the period of use of the appliances ...
... CO2-eq emissions. According to the results, wood pellet furnace could reduce emissions by 38% compared with the firewood stove. The results showed that wood pellet furnace has a lower negative impact on the environment and climate change, and at the same time, it ensures the financial benefits through ...Boban Pavlović, Dejan Ivezić, Marija Živković. "Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households" in 5th International Scientific Conference ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo, 2020, University of East Sarajevo, Faculty of Mechanical Engineering East Sarajevo (2020)
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Determining the Impact of Cutting Elements State on the Bucket–Wheel Excavator Vibration and Energy Consumption
Background There are two types of specifc sizes’ measurements. The frst is the measurement of energy consumption in a working technological process, and the second is the measurement of vibration, which is displayed over amplitudes of speed. There is an interplay between these two processes. Increasing the power consumption, the value of the vibration speed amplitudes increases. Purpose The process of the determination of machining parameters was based on minimizing the power consumption and vibration of the cutting tool, ...Filip Miletić, Predrag Jovančić, Miloš Milovančević, Miloš Tanasijević, Stevan Đenadić. "Determining the Impact of Cutting Elements State on the Bucket–Wheel Excavator Vibration and Energy Consumption" in Journal of Vibration Engineering & Technologies, Springer (2022). https://doi.org/10.1007/s42417-022-00482-3
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Development of integrated fuzzy model for mine management optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)... L-29C of the Bešpelj mine near Jajce in the Republic of Serbia, Bosnia and Herzegovina, which is the focus of the paper. Study area and geology. The Bešpelj bauxite mine is located on a spacious karst plateau, on the right bank of the Vrbas River. It is at a beeline distance of 10 km from the town ...
... as well as calculated weights. 'The final scores of al] the alternatives, in the form of triangular fuzzy numbers, were calculated under Step 5, based on Eq. 5, and then the final “weights” of the alternatives were derived in the form of non-fuzzy numbers. The optimization indices shown in Table ...
... multicriteria decision making., the criteria are described by linguistic variables and represented in the form of triangular fuzzy numbers (membership functions: “L, S, D”). On the one aand, the criteria are analyzed and evaluated using, a scale of relative importance. On the other hand, mathematical ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of integrated fuzzy model for mine management optimization" in Comptes rendus de l'Académie Bulgare des Sciences (2023)
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Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector
To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatoriBoban Pavlović, Dejan Ivezić, Marija Živković. "Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector" in Energy Policy, Elsevier BV (2020). https://doi.org/10.1016/j.enpol.2020.111936
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Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation
Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović. "Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation" in Thermal Science, National Library of Serbia (2023). https://doi.org/10.2298/TSCI220813168I
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WS4LR - a Worksation for Lexical Resources
... offers to the user the option to apply the transformation only to a part of the file, such as an XML file where only the text should be converted while the XML tags shouldn’t be altered. Similarly, when a DELAS or DELAF type file is transformed, only lemmas and word forms are converted, not the part ...
... aligned text or bitext. Aligned texts are usually constructed in two main steps: in the first step, the texts to be aligned are segmented into equivalent units, and in the second step the correspondence between these units is established. The equivalent units are usually sentences, but the units can ...
... DELAS by applying the appropriate transducers. The organization of dictionaries in separate files is important from the practical point of view since smaller files are easier to manipulate. An even more important reason is the fact that in text recognition by Intex/Unitex the usage of all dictionaries ...Cvetana Krstev, Ranka Stanković, Duško Vitas, Ivan Obradović. "WS4LR - a Worksation for Lexical Resources" in Proceedings of the Fifth Interantional Conference on Language Resources and Evaluation, Genoa, Italy, May 2006, ELRA - European Language Resources Association (2006)
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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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A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia
When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...... ‘‘Identification of renewable energy sources with the most potential for electricity generation’’. The second level represents criteria (C1 - C4). The RESs (alterna- tives A1 - A4) are on the third level, which is at the bottom of the hierarchy (Fig. 4). Once the hierarchy is built, FAHP can be implemented ...
... use. Wind energy in the Republic of Serbia can be used in the area with Kosava wind, south Banat, eastern Serbia, Pester, etc. Solar energy potential represents the energy potential that can be used to produce heating or electricity. On the greater part of the territory of Serbia, the number of hours of ...
... criterion, the aggregation of experts’ judgments (EJ) is done by using the ge- ometrical mean (GM) method (Eq. (1)), with the assumption that the experts are of equal importance: CEJ = 5 √ EJ1 ∗ EJ2 ∗ ...... ∗ EJ5 (1) The GM is selected based on a literature review noting that, in the cases of aggregation ...Boban Pavlović, Dejan Ivezić, Marija Živković. "A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia" in Energy Reports, Elsevier BV (2021). https://doi.org/10.1016/j.egyr.2021.02.072
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Tectono-lithostratigraphic model of the Northern Banat Miocene sediments (Pannonian Basin, Serbia)
Dejan Radivojević, Ljupko Rundić (2017)... Middle Miocene, and their age was generated based on the analogy with the neighboring areas. The Badenian sediments are mostly represented with its lower part while middle and upper stages are confirmed just on the couple of wells. The thickness of the siliciclastic, carbonate and volcaniclastic sediments ...
... tion of the paleo-Danube shelf margin across the Pannonian Basin during the Late Miocene and Early Pliocene. Global and Planetary Change, 103, 168–173. MATENCO, L.C., & RADIVOJEVIĆ, D. (2012): On the formation and evolution of the Pannonian Basin: Constraints derived from the structure of the junction ...
... was placed on the Miocene sediments which are the most valuable part of sedimentary cover due to its economic signiºcance. °e extension of the Pannonian Basin has not occurred simultaneously throughout the area, and it is possible to speak only about synrift and postrift stage in the broader sense ...Dejan Radivojević, Ljupko Rundić. "Tectono-lithostratigraphic model of the Northern Banat Miocene sediments (Pannonian Basin, Serbia)" in 7th International Workshop: Neogene of Central and South-Eastern Europe, Velika, Croatia, maj 2017, Croatian Geological Society (2017)
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Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance
Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography... nappe stack including the underlying: mćlanges. The final emplacement of the mćlanges and the nappes in the area ofthe Dinaridic Ophiolite Belt, meaning to the west ofthe Drina-Ivanjica unit is therefore much younger than the forma- tion of the mćlanges. On basis of the commonly accepted re ...
... limestones from the continental slope. On the basis of this composition we can conclude that the Upper Triassic radiolarite clasts derive cither from 1) the younger parts of the sedimentary succession above the oceanic crust ncar the continental slope or, more convincingly 2) the sedimentary cover ...
... deposition on the ocean floor (Krische et al. 2014; Gawlick & Missoni 2015). The absence ofribbon radio- larites on the continental margin is due to the fact that supply from shallow-water carbonate ramps and platforms led to the accumulation of a thick pile of carbonate mud on the distal shelf ...Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović. "Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance" in Geologica Carpathica (2017)
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New paleoecological perspectives on Late Pleistocene Neanderthals in northern Balkans: the rodent assemblages from Smolućka cave (Serbia)
Mihailo Jovanović, Katarina Bogićević, Draženko Nenadić, Jordi Agustí,·Christian Sánchez Bandera, Juan Manuel López García, Hugues Alexandre Blain (2022)During the Late Pleistocene, the Balkans came to be an important region with many isolated areas, enabling fauna, alongside Neanderthals, to thrive in the area. This work is focused on paleoenvironmental and paleoclimatic changes that occurred in the northern Balkan Peninsula with a special focus on fossil record from Smolućka cave aging from MIS 5 to MIS 3. Based on available data, an attempt has been made to establish a synthetic chronological context for the faunal assemblages recovered from ...Mihailo Jovanović, Katarina Bogićević, Draženko Nenadić, Jordi Agustí,·Christian Sánchez Bandera, Juan Manuel López García, Hugues Alexandre Blain. "New paleoecological perspectives on Late Pleistocene Neanderthals in northern Balkans: the rodent assemblages from Smolućka cave (Serbia)" in Archaeological and Anthropological Sciences (2022)