Претрага
206 items
-
Efficiency and lifetime of medium voltage transformers
Snežana Aleksandrović, Vesna Damnjanović. "Efficiency and lifetime of medium voltage transformers" in XVI International Scientific – Professional Symposium, INFOTEH, Jahorina, 22. mart - 24. mart 2017., Istočno Sarajevo : Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu (2017)
-
The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers
One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...... requires investment of some kind. Life cycle costs can be classified as follows (Eq. 1): e Ownership costs: o Acquisition cost, including transport, supply, insurance, o Administrative cost, including management, informatics. e Operational costs, which are including labor, auxiliary facilities, installations ...Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović. "The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers" in 7th International Symposium Mining and Environmental Protection, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2019)
-
Intrinsic groundwater vulnerability assessment by multiparameter methods, a case study of Suva Planina Mountain (SE Serbia)
Branislav Petrović (2020)Branislav Petrović. "Intrinsic groundwater vulnerability assessment by multiparameter methods, a case study of Suva Planina Mountain (SE Serbia)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-8825-8
-
Karstification depth and storativity as main factors of karst aquifer regimes: some examples from southern Alpine branches (SE Europe and Middle East)
Zoran Stevanović, Vesna Ristić-Vakanjac, Saša Milanović, Ljiljana Vasić, Branislav Petrović, Marina Čokorilo-Ilić (2015)Zoran Stevanović, Vesna Ristić-Vakanjac, Saša Milanović, Ljiljana Vasić, Branislav Petrović, Marina Čokorilo-Ilić. "Karstification depth and storativity as main factors of karst aquifer regimes: some examples from southern Alpine branches (SE Europe and Middle East)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2015). https://doi.org/10.1007/s12665-015-4046-y
-
Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeLjiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu. "Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-08910-x
-
Predictive modeling for U and Th concentrations in mineral and thermal waters, Serbia
Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeMarina Ćuk Đurović, Igor Jemcov, Maja Todorović, Ana Mladenović, Petar Papić, Jana Štrbački. "Predictive modeling for U and Th concentrations in mineral and thermal waters, Serbia" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-09204-y
-
Origin, diversity and geothermal potentiality of thermal and mineral waters in Vrnjačka Banja, Serbia
Earth-Surface Processes, Geology, Pollution, Soil Science ,Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeJana Štrbački, Vladimir Živanović, Marina Ćuk Đurović, Nebojša Atanacković, Veselin Dragišić. "Origin, diversity and geothermal potentiality of thermal and mineral waters in Vrnjačka Banja, Serbia" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-09050-y
-
Rare earth elements in mineral waters in Serbia
Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeMaja Todorović, Marina Ćuk Đurović, Jana Štrbački, Petar Papić. "Rare earth elements in mineral waters in Serbia" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-09029-9
-
The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia
For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...... configuration of terrain for installing equipment at the locations of existing landfills, • the lack of adequate municipal infrastructure (roads, water supply, sewerage, electrical installations) at locations outside urban areas, so the costs of preparing the terrain often exceed the costs of establishing ...
... separation at the example city of Vlasotince, International conference – Waste waters, municipal solid wastes and hazardous wastes, Association for water technology and sanitary engineering, Niska Banja, 294-298. Rakic, D. (2013). Constitutive relations of landfill municipal waste in Serbia (in Serbian) ...Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić. "The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia" in 17th International waste management and landfill symposium, Proceedings SARDINIA 2019, CISA Publisher (2019)
-
Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia
Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić (2023)Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive industry and the local community. On the example of the "Valjevo" B-Li deposit, data on structural settings and previous hydrogeological investigations were combined with the results of resource drilling and geophysical ...... significant karst aquifer is formed on the basin's southern margin, with groundwater from the middle Triassic limestone being utilized for the public water supply of Valjevo, Mionica and surrounding settlements. Karst groundwater under artesian pressure and elevated temperatures (17–37 "C) are taped with ...
... outcrop on the surface. 7,410,000 7,412,000 7,414,000 „420, a w 7,424,000 7,426,000 7,428,000 7,430,000 » A NZ ELB drillhole 4, 91 0, 00 0 Water temperature *C 11 - 20 e 21-30 e 31-40 4, 90 8, 00 0 Cross section line 4, 90 6, 00 0 -| š 4, 90 2, 00 0 4, 90 0, 00 0 Figure ...
... Existing data indicate that the limestones of the Middle Triassic are characterized by a significant degree of karstification and that they are more water-bearing than compared to the Lower Triassic. However, to consider the geothermal potential, the Triassic sediments are interpreted as a unique carbonate ...Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić. "Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia" in Proceedings 9th International Conference mining and environmental protection, MEP23, Sokobanja, 24-27th May 2023, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet (2023)
-
Filter rules for soil and geosynthetics
Štetni efekti izazvani strujanjem vode kroz različite građevine (brane, nasipi i sl.) uspešno se rešavaju ugradnjom različitih filterskih slojeva. Osnovne funkcije filterskih slojeva su brza evakuacija vode uz sprečavanje unutrašnje erozije i iznošenje sitnih čestica tla. Ovi filterski slojevi najčešće se grade od krupnozrnih materijala (pesak, šljunak, kameni agregati), ali se pored prirodnih materijala sve više koriste i veštački geosintetički materijali. U radu su prikazana osnovna filtarska pravila koja treba ispoštovati da bi se izvelo uspešno projektovanje različitih filtracionih ...Dragoslav Rakic, Irena Basaric Ikodinovic, Milenko Ljubojev. "Filter rules for soil and geosynthetics" in Mining and Metallurgy Engineering Bor, Mining and Metallurgy Institute Bor (2021). https://doi.org/10.5937/mmeb2101001R
-
Оцјена водопропусности понорске зоне Шуковићу (Цернићко поље) помоћу Лижоновог теста
One of the specificities of reservoirs forming in highly karstified terrains is reflected in the wide range of unknowns, specifically during reservoir formation, filling and operation. Unfortunately, despite complex research, many reservoirs constructed in karst terrains have problems with water losses from the reservoir to other aquifers due to ponor and ponor zones which are a common in the karst of Eastern Herzegovina. One of such zones is Šuković ponor located in the southern part of the Cerničko polje ...Петар Војновић, Саша Милановић, Љиљана Васић. "Оцјена водопропусности понорске зоне Шуковићу (Цернићко поље) помоћу Лижоновог теста " in Мултидисциплинарна конференција “Kарст 2022 - Значај, стање и перспективе коришћења и заштите ресурса у карсту", Српска академија наука и уметности (2022)
-
Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)
Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction... groundwater age 1. Introduction Karst groundwater represents one of the most important water supply resources in the world. About 20–25% of the world's population, including, that in Serbia, uses the water accumulated in karstic aquifers [1-3]. The goal of karst groundwater research, especially ...
... Geology, University of Belgrade, Belgrade, Serbia, 2017; p. 389. 13. Stevanović,Z. Hvdrogeology of Carpathian-Balkan Karst of Eastern Serbia and Water Supply Opportunities; Spec. ed. Fac. Min. & Geol.: Belgrade, Serbia, 1991; pp. 1-245. (In Serbian) 14. fFilipović,B.; Stevanović, Z. Izveštaj o hi ...
... while subthermal water drains from borehole B-1 and has a constant discharge rate of 5 L/s. Water temperatures are uniform and increase with depth, so the water temperature at he Krupaja Spring ranges from 10 to 11.4 "C, expressing its seasonal characteristics. The highest water temperature of ...Ljiljana Vasić, Saša Milanović, Tina Dašić. "Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)" in Sustainability, MDPI AG (2023). https://doi.org/10.3390/su151411146
-
High-resolution sequence stratigraphy of carbonates - theory and examples
Jelena Stefanović, Dejan Radivojević (2020)Циљ рада је да кроз теоријски аспект и примере примене представи секвенциону стратиграфију високе резолуције карбонатних седимената. У том смислу први део се односи на појам и значење високе резолуције у секвенционој стратиграфији. Од временских и просторних скала које одговарају сеизмичким профилима у последњих двадесет година метода је нашла примену на скалама које одговарају бушотинским подацима или изданцима. Као најпогоднији седименти за овај тип истраживања су се показали карбонати јер су осетљиви на еустатичке промене, а основе секвенционе стратиграфије ...... карбоната, минералног састава, дубине и потенцијала раста могу се разликовати три типа „карбонатних фабрика“: Т (tropical и top-of-the-water-column), C (cool water и controlled precipitation) и М (mud-mount, micrite и microbes) тип. Појам карбонатне платформе обухвата све појаве дебелих маса пл ...
... Jurassic-Cretaceous carbonates deposited on Tethyan platforms. Key words: outcrop, systems tract, Jurassic-Cretaceous, carbonate platform, shallow-water environment 1 Универзитет у Београду, Рударско-геолошки факултет, Каменичка 6, Београд; ...
... BONVALLET, L., ARNAUD-VANNEAU, A., ARNAUD, H., ADATTE, T., SPANGENBERG, J., STEIN, M., GODET, A. & FÖLLMI, K. 2019. Evolution of the Urgonian shallow-water carbonate platform on the Helvetic shelf during the late Early Cretaceous. Sedimentary Geology. 387. 10. pp.18-56. BOVER-ARNAL, T., SALAS, R. ...Jelena Stefanović, Dejan Radivojević. "High-resolution sequence stratigraphy of carbonates - theory and examples" in Zapisnici Srpskog geološkog društva za 2020. godinu, Srpsko geološko društvo (2020)
-
GIS Application Improvement with Multilingual Lexical and Terminological Resources
... information for the map reader. Annotation may identify or describe a specific map entity, provide general information about an area on the map, or supply information about the map itself. In general, the placement of descriptive text, or label, onto or next to features on a map is known as labelling ...Ranka Stanković, Ivan Obradović, Olivera Kitanović. "GIS Application Improvement with Multilingual Lexical and Terminological Resources" in Proceedings of the 5th International Conference on Language Resources and Evaluation, LREC 2010, Valetta, Malta, May 2010, Valetta, Malta : European Language Resources Association (2010)
-
Effects of Energy Production and Consumption on Air Pollution in Serbia
Marija Živković (2019)Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...... the country 7. The trend and the structure of primary energy consumption for the last ten years are given in Figure 2. In 2017 total primary energy supply was 667890 TJ 8. It can be characterized as highly fossil intensive – 87.88% of energy consumed in Serbia is related to fossil fuels. Almost 50% of ...
... Residential37.00%Transport59.09%Public and comercial 3.90% Passenger91.62%Freight8.38% Space Heating99.36%Cooking and hot water 0.64% Natural Gas1.23%Gasoline25.59%Diesel54.52%Fuel Oil1.80%LPG8.71%Coal Sub bituminous 1.53% Wood6.60%Biomass0.02% Residential8 ...Marija Živković. "Effects of Energy Production and Consumption on Air Pollution in Serbia" in Mining and Environmental Protection-MEP 2019, University of Belgrade, Faculty of Mining and Geology (2019)
-
Valorization of non-balanced coal reserves in Serbia for underground coal gasification
David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...... them to the compressed air line (p = 50 bar), or even nitrogen, — by water pressure with a pump set, and — by establishing a link with hydraulic fracturing, by means of high-pressure injection of the fluid (such as water, gel or foam), containing send or other proppants suspended with var- ious ...
... reactions occurring within the with CRIP layer. The primary reaction that happens is the displacement reaction of the generated water vapor (H.O) and gas, where water vapor and carbon from the coal generate H», and CO. In order to improve the quality of the gas ob- tained, the concentrations ...
... previously mentioned 92-97% of H.SSO,). Reduction of the amount of water from the gas generator prior to the ignition is done by the previous drainage or by blowing the air of a certain pressure and temperature, with the aim of water extraction. Neglecting hydrogeological research can lead to congestion ...David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić. "Valorization of non-balanced coal reserves in Serbia for underground coal gasification" in Thermal Science (2019). https://doi.org/10.2298/TSCI190725390P
-
Потреба за израдом биланса и оценом расположивих резерви подземних вода Републике Србије
Природне карактеристике Србије, просторна дистрибуција ресурса водe и њихових корисника, као и међусобна интеракција коришћења, заштите вода, као и заштите од вода, условиле су да се подземне воде на читавој територији морају посматрати интегрално, јединствено, комплексно и рационално. Међутим, тренутно је у Републици Србији могуће дефинисати само одлике појединих издани и/или изворишта услед непостојања довољних података за свеобухватну анализу стања ресурса. За оцену притиска на квантитет ресурса подземних вода, што је обавеза према Оквирној директиви о водама ЕУ (ОДВ) ...Зоран Стевановић, Вељко Мариновић, Бранислав Петровић. "Потреба за израдом биланса и оценом расположивих резерви подземних вода Републике Србије" in Записници Српског геолошког друштва, Српско геолошко друштво (2021)
-
Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete
Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija... to the constant mass, and then were saturated in water. The percentage difference of masses of a saturated and a dry sample, and the mass of the dry sample represents the water absorption at atmospheric pressure. Water absorption (determination of water absorption coefficient due to capillary action of ...
... density of hardened mortar kg/m3 2176 ± 11.5 2132 ± 12.4 2073 ± 12.0 2055 ± 9.7 2031 ± 10.2 Water absorption (water absorption at atmospheric pressure) % (m/m) 7.1 ± 0.19 7.5 ± 0.15 8.2 ± 0.17 8.1 ± 0.14 7.9 ± 0.18 Water absorption (coefficient due to capillary action of hardened mortar): for mortars other ...
... in the value of water absorp- tion at atmospheric pressure, while, on the other hand, it contributed to a decrease in the Minerals 2021, 11, 925 10 of 16 absorption coefficient due to capillary water absorption. However, regardless of the test method, the maximum difference in water absorption values ...Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović . "Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete" in Minerals, MDPI (2021). https://doi.org/10.3390/min11090925
-
Режим изворских вода из кристаластих стена у планинским подручјима на примеру Топлог Дола на Власини (Југоисточна Србија)
Сунчица Гардијан, Владимир Живановић, Сава Магазиновић, Ђорђе Мандић, Саша Стојадиновић. "Режим изворских вода из кристаластих стена у планинским подручјима на примеру Топлог Дола на Власини (Југоисточна Србија)" in Zbornik radova XVI srpskog Simpozijum o hidrogeologiji sa međunarodnim učešćem, Univerzitet u Beograd, Rudarsko-geološki fakultet (2022)