Претрага
1748 items
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Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells
Electric submersible pumps (ESP) are applied in wells where additional energy is needed to ensure discharge of the fluid to the surface through the tubing. At the discharge side of the pump the fluid has bigger velocity, thus the pump induces a forced convection between the fluid and the tubing inner surface. Understanding of convective heat transfer in wellbores and analyses of influential parameters provides a possibility to optimise value of convective heat transfer coefficient in order to avoid ...Bojan Martinovic, Marija Živković, Branko Grubač. "Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells" in International Journal of Oil, Gas and Coal Technology, Inderscience Publishers (2021). https://doi.org/10.1504/IJOGCT.2021.10043281
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Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field
Most of the wells in the oilfield Turija are operating with sucker rod pumps, where casing pressure at around 15 bar, and with marginal production rates. The high value of casing pressure indicates high pressure on the face of the formation and depends directly on well productivity. In addition, with increasing value of the casing pressure gas column in the annulus is moving the dynamic fluid level near pump intake and more gas is entering the pump, it results ...beam gas compressor, BGC, increase productivity, sucker rod pump, SRP, mature field, artificial lift, production optimisationBojan Martinović, Dušan Danilović, Branko Grubač, Robert Fadiga. "Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field" in International Journal of Oil Gas and Coal Technology (2022)
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CliRtheRoads: An Integrated Approach to Landslide Risk Management on Roads in Serbia
Biljana Abolmasov, Ranka Stanković, Miloš Marjanović, Nikola Vulović, Uroš Đurić . "CliRtheRoads: An Integrated Approach to Landslide Risk Management on Roads in Serbia" in Progress in Landslide Research and Technology, Springer Cham (2023). https://doi.org/https://doi.org/10.1007/978-3-031-44296-4_23
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Economy and geological economical evaluation of phosphate deposit in Iraq Republick
Falah Jaber (1968)Falah Jaber. Economy and geological economical evaluation of phosphate deposit in Iraq Republick, Beograd:Rudarsko-geološki fakultet, 1968
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Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine
Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović. "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine" in Energies, MDPI AG (2019). https://doi.org/10.3390/en12214044
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The role of non-covalent intermolecular interactions on the diversity of crystal packing in supramolecular dihalopyridine–silver(i) nitrate complexes
Sunčica Roca, Lucija Hok, Robert Vianello, Mladen Borovina, Marijana Đaković, Ljiljana Karanović, Dražen Vikić-Topić, Zora Popović (2020)Six novel 1 : 2 complexes of silver(I) nitrate with 2,5-, 2,6- and 3,5-dihalopyridines (halo stands for chlorine and bromine) were prepared by the reaction of an aqueous solution of AgNO3 and the corresponding pyridine derivative in a water–alcohol solution. In spite of having analogous empirical formulae, they reveal intriguing structural differences, except [Ag(NO3)(2,5-Cl2py)2]n (1) and [Ag(NO3)(2,5-Br2py)2]n (4), which are isostructural. In contrast, [Ag(NO3)(3,5-Cl2py)2]2 (3) is dimeric, while its Br analogue [Ag(NO3)(3,5-Br2py)2]n (6) is polymeric in nature, being the ...Sunčica Roca, Lucija Hok, Robert Vianello, Mladen Borovina, Marijana Đaković, Ljiljana Karanović, Dražen Vikić-Topić, Zora Popović. "The role of non-covalent intermolecular interactions on the diversity of crystal packing in supramolecular dihalopyridine–silver(i) nitrate complexes" in CrystEngComm, Royal Society of Chemistry (RSC) (2020). https://doi.org/10.1039/D0CE01257B
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Analysis of the correlation between modified secondary and primary compression index on the example of old municipal waste in Serbia
The paper presents the results related to the determination of the index of primary and maximum and minimum indices of secondary compression, i.e. modified primary and secondary compression indices (Cc, Cc', C'min, C'max), obtained by laboratory testing of artificially prepared municipal waste samples (three series of 9 samples in total) in an oedometer apparatus with a diameter of 20 cm. Old municipal waste was used, which was taken from two landfills in Serbia, one that is ...municipal solid waste, secondary compression index, ratio of modified secondary and primary compression indexDragoslav Rakić, Irena Basarić Ikodinović, Jovana Janković, Tina Đurić. "Analysis of the correlation between modified secondary and primary compression index on the example of old municipal waste in Serbia " in 20th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE), ICMS Australasia (2022)
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AR, CR and ARCR modeling for simulations and analyses of karst groundwater quality parameters
Although an invisible component of the hydrologic cycle, groundwater generally takes precedence over other water resources in the area of drinking water supply. Among groundwater resources, karst aquifers tend to be rich in sufficiently-accessible amounts of high-quality water. During most of the year, this water requires only disinfection prior to delivery to the end user. However, in many cases extreme rainfall and/or sudden snow melt results in transient turbidity, increase in bacterial count and temporary contamination (e.g. increase in ...autocorrelation, cross-correlation, autoregressive model, cross-regressive model, autocross regressive model, nitrates, Banja Spring, Serbia.Vesna Ristić-Vakanjac, Marina Ćokorilo-Ilić, Petar Papić, Dušan Polomčić, Radisav Golubović. "AR, CR and ARCR modeling for simulations and analyses of karst groundwater quality parameters" in Geološki anali Balkanskoga poluostrva, National Library of Serbia (2018). https://doi.org/10.2298/GABP1879071R
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Challenges and Insights: Sequence Stratigraphy of Pannonian Coals in the Drmno Depression, Serbia
The application of sequence stratigraphy on coal beds worldwide has significantly contributed to the under¬standing of coal deposits and their origin. On the southeastern edge of the Serbian part of the Panno¬nian basin, there is a system of peri-Pannonian basins characterized by the appearance of Upper Miocene coal seams in the siliciclastic fill, which provides an ex¬cellent opportunity for testing sequence stratigraphy in young coal basins. In this study, sequence stratigraphy was applied to coals in the Drmno Depression, ...Anastasia Ninić, Dragana Životić, Dejan Radivojević. "Challenges and Insights: Sequence Stratigraphy of Pannonian Coals in the Drmno Depression, Serbia" in 10th International workshop Neogene of Central and South-Eastern Europe, Podčetrtek, Slovenia, May 27 to 31 , 2024, Geological Survey of Slovenia (2024)
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Life Cycle Assessment of Fly Ash Landfills from Lignite Combustion Process in Thermal Power Plants in Serbia
Velika količina energije u svetu se i dalje dobija sagorevanjem raznih vrsta ugljeva. Pored toga veliki problem predstavlja i činjenica da njegovo sagorevanje ima štetne posledice po zdravlje ljudi i životnu sredinu. Elektrofilterski pepeo nastao njegovim sagorevanjem, koji se tretira kao otpad i u najvećim količinama se odlaže na deponije. Količine se procenjuju na milijardu tona godišnje. Samo u Srbiji oko 250 miliona tona letećeg pepela, koji je nastao sagorevanjem lignita, je deponovan. Međutim, mnoge studije su pokazale ...Ognjen Adamović, Lisa Hallberg, Erik Emilsson, Ivica Ristović. "Life Cycle Assessment of Fly Ash Landfills from Lignite Combustion Process in Thermal Power Plants in Serbia" in 9th International Conference MINING AND ENVIRONMENTAL PROTECTION, 24-27.05.2023., Soko Banja, University of Belgrade, Faculty of Mining and Geology (2023)
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Shear strength of municipal waste materials from two landfills in Serbia
Rakić Dragoslav, Čaki Laslo, Ćorić Slobodan. "Shear strength of municipal waste materials from two landfills in Serbia" in Coupled Phenomena in Environmental Geotechnics (CPEG) – from theoretical and experimental research to practical applications, Torino, Italy:CRC Press, Taylor & Francis Group (2013): 347-354
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Bioindicators of Heavy Metals in Soils Realised Through Weathering of Stones
Jović Vidojko, Krupniković Marijana, Srećković Batoćanin Danica. "Bioindicators of Heavy Metals in Soils Realised Through Weathering of Stones" in Proceedings / 2nd International Conference Harmony of Nature and Spirituality in Stone, 15-16 March 2012, Kragujevac, Belgrade:Stone Studio Association (2012): 65-71
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Landslide types and processes in Serbia
Abolmasov Biljana, Hadži-Niković Gordana. "Landslide types and processes in Serbia" in Croatia-Japan Project “Risk identification and land-use planning for disaster mitigation of landslides and floods in Croatia”, 1st Project Workshop: International experience. Dubrovnik, Croatia, 22-24 November 2010 1, Zagreb, Hrvtaska:Japan International Cooperation Agency (JICA) (2010): 39-39
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A review of Veliki Majdan tailings dam rehabilitation,
Kostović Milena, Vitorović Zdravko (2011)Kostović Milena, Vitorović Zdravko. "A review of Veliki Majdan tailings dam rehabilitation," in Proceedings of the XIV Balkan Mineral Processing Congress II, Tuzla, Bosnia and Herzegovina:Faculty of Mining, geology and civil engineering in Tuzla and Faculty of Mining in Prijedor, University of Tuzla (2011): 799-801
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Mineral resources in the Republic of Serbia: A Driving Force for Economic Development – Pro et Contra
Jelenković Rade (2014)Jelenković Rade. "Mineral resources in the Republic of Serbia: A Driving Force for Economic Development – Pro et Contra" in 4nd International Conference Mineral resources in the Republic of Serbia: A Driving Force for Economic Development, Beograd:TGI Executive Meetings (2014)
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Coherent oscillations in minimal neural network of excitable systems induced by time delay
Vasović Nebojša, Burić Nikola, Grozdanović Ines, Todorović Kristina. "Coherent oscillations in minimal neural network of excitable systems induced by time delay" in 11th Symposium on Neural Network Applications in electrical Engineering, Beograd:Faculty of Electrical Engineering (2012)
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Volcanogenic-sedimentary Formations in Parts of South-Western Nigeria, and their Mineral Potentiality
B.E. Bafor (1979)B.E. Bafor. Volcanogenic-sedimentary Formations in Parts of South-Western Nigeria, and their Mineral Potentiality, Belgrade:Faculty of Mining and Geology, 1979
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U-Pb zircon geochronology of the Paleogene – Neogene volcanism in the NW Anatolia: Its implications for the Late Mesozoic-Cenozoic geodynamic evolution of the Aegean
E. Yalçın Ersoy, Cüneyt Akal, Ş. Can Genç, Osman Candan, Martin R. Palmer, Dejan Prelević, İbrahim Uysal, Regina Mertz-Kraus (2017)The northern Aegean region was shaped by subduction, obduction, collision, and post-collisional extension processes. Two areas in this region, the Rhodope-Thrace-Biga Peninsula to the west and Armutlu-Almacık-Nallıhan (the Central Sakarya) to the east, are characterized by extensive Eocene to Miocene post-collisional magmatic associations. We suggest that comparison of the Cenozoic magmatic events of these two regions may provide insights into the Late Mesozoic to Cenozoic tectonic evolution of the Aegean. With this aim, we present an improved Cenozoic stratigraphy ...E. Yalçın Ersoy, Cüneyt Akal, Ş. Can Genç, Osman Candan, Martin R. Palmer, Dejan Prelević, İbrahim Uysal, Regina Mertz-Kraus. "U-Pb zircon geochronology of the Paleogene – Neogene volcanism in the NW Anatolia: Its implications for the Late Mesozoic-Cenozoic geodynamic evolution of the Aegean" in Tectonophysics 717 (2017): 284-301. https://doi.org/10.1016/j.tecto.2017.08.016
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Vulnerability methods in hard rock formation as a basis for groundwater risk assessment – from resource to source
Groundwater in a hard rock formation is most endangered at places where a potential source can discharge contaminants that can reach the saturated zone of an aquifer. In these circumstances, an essential tool for groundwater protection is the contamination risk map. This map is based on the integration of two maps: a hazards map, i.e., map of potential sources of contamination and a vulnerability map. The selection of a proper vulnerability method is an important task since the resulting ...karta rizika od kontaminacije, ranjivosti podzemnih voda, DRASTIC, EPIK, PI, COP, Nacionalni park TaraVladimir Živanović, Igor Jemcov, Veselin Dragišić. "Vulnerability methods in hard rock formation as a basis for groundwater risk assessment – from resource to source" in Geologia Croatica, Croatian Geological Survey (2022). https://doi.org/10.4154/gc.2022.23
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The Many Faces of SrpKor
Акроним СрпКор означава фамилију електронских корпуса савременог српског језика чија је изградња почела крајем седамдесетих година прошлога века, а која је постала шире видљива заинтересованој истраживачкој заједници објављивањем његове прве верзије на вебу 2002. године. У овом дугом периоду, посебно пре појаве корисних текстуелних ресурса на вебу, развој корпуса се састојао у прикупљању и обради грађе као и у развоју метода обраде корпуса. Наиме, електронски корпус није само колекција текстова у дигиталном облику (како се то, на пример, наводи ...Duško Vitas, Ranka Stanković, Cvetana Krstev. "The Many Faces of SrpKor" in South Slavic Languages in the Digital Environment JuDig Book of Abstracts, University of Belgrade - Faculty of Philology, Serbia, November 21-23, 2024, University of Belgrade - Faculty of Philology (2024.)