Претрага
2759 items
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Design of a sucker rod pumping system
Ana Ponoćko (2024)For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...Ana Ponoćko. Design of a sucker rod pumping system, 2024
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The use of scanning electron microcopy for in-situ identification of Gold and palladium minerals from Čukaru peki deposit, eastern Serbia
Miloš Velojić, Viktor Bertrandsson Erlandsso, Frank Melcher. "The use of scanning electron microcopy for in-situ identification of Gold and palladium minerals from Čukaru peki deposit, eastern Serbia" in Third international conference on electron microscopy of nano structures elmina 2024, Serbian Academy of Sciences and Arts (2024)
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Linearization of Input Signal as a Necessary Tool in Stochastic Modeling of Karst Groundwater
Veljko Marinović (2021)Modelling of karst hydrogeological systems is a very complicated task, bearing in mind that for a deterministic model one should know the internal physical processes of precipitation transformation into discharge, while for a stochastic model nonlinear dynamic systems such as karst should be simulated by linear regression equations. Stochastic models need linearization of input time series due to often large residual in the recession period. This occur because the model is not able to absorb single rain episodes, which ...Veljko Marinović. "Linearization of Input Signal as a Necessary Tool in Stochastic Modeling of Karst Groundwater" in Karst: From Top to Bottom, Belgrade, 6.6.2021., Belgrade : Centre for Karst Hydrogeology (2021)
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Distribution of Potentially Toxic Elements in the City of Zintan and Its Surroundings (Northwestern Libya) by Surface Soil Sampling
Boris Vakanjac, Zorana Naunović, Vesna Ristić Vakanjac, Tanita Đumić, Saša Bakrač, Jana Štrbački, Vuk Gajić, Taher Mohamed Alzarog (2023)The study area is the city of Zintan, in northwestern Libya, which has grown over the past 30 years. Its current population is roughly 30,000. Although the city is in part commercial, most of the population engages in agriculture and primarily grows cereal crops (wheat and barley). The demand of the growing city for agricultural products has increased, intensifying the use of fertilizers, pesticides, and insecticides. Consequently, concentrations of potentially toxic elements (PTE) in the soil have increased. To ...Boris Vakanjac, Zorana Naunović, Vesna Ristić Vakanjac, Tanita Đumić, Saša Bakrač, Jana Štrbački, Vuk Gajić, Taher Mohamed Alzarog. "Distribution of Potentially Toxic Elements in the City of Zintan and Its Surroundings (Northwestern Libya) by Surface Soil Sampling" in Minerals, MDPI AG (2023). https://doi.org/10.3390/min13081048
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Mineragenija i potencijalnost karbonatnih sirovina rudnog reona Bjelopavlića (Crna Gora)
Darko M. Božović (2016-09-28)Karbonatne sirovine, obzirom na geološku građu Crne Gore predstavljaju jednu od najznačajnijih nemetaličnih mineralnih sirovina. U Crnoj Gori postoje brojna leţišta karbonatnih sirovina (arhitektonsko - građevinskog i tehničko - građevinskog kamena) koja su istraţena ili su u eksploataciji, među kojima rudni reon Bjelopavlića zauzima najznačajnije mjesto.Dosadašnja istraţivanja karbonatnih sirovina na ovom području imala su, međutim, prevashodno uzak istraţivački cilj, utvrđivanje rezervi arhitektonsko - građevinskog i tehničko - građevinskog kamena određenog leţišta, ili preliminarna ispitivanja kvaliteta krečnjaka u njima, sa ...karbonatne mineralne sirovine, arhitektonsko - građevinski kamen, tehničko - građevinski kamen, karbonatna punila, rudni reon Bjelopavlića, potencijalnost.Darko M. Božović. "Mineragenija i potencijalnost karbonatnih sirovina rudnog reona Bjelopavlića (Crna Gora)" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-09-28)
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Optimizacija dužine strele rotornih bagera u funkciji stabilnosti kosina i efektivnosti rada na površinskim kopovima lignita Srbije
Branko M. Petrović (2016-07-12)Rotorni bageri su mašine koje se u današnje vreme najviše primenjuju uprocesu masovne eksploatacije uglja zahvaljujući, pre svega, nizu tehničkoeksploatacionihprednosti u odnosu na druge vrste bagera. Raznovrsnirudarsko-tehnički zahtevi otkopavanja doprineli su razvoju nekoliko tipova ovihmašina, tako da svaki od njih ima svoje prednosti i nedostatke u odnosu nadrugi tip.Predmet istraživanja u disertaciji odnosi se na izbor optimalnekonstrukcije strele bagera i njene usaglašenosti sa uslovima radne sredine kojiće vladati na površinskim kopovima lignita Srbije, imajući u vidu složene usloveeksploatacije (velika ...površinski kop, parametri bloka, kapacitet, rotorni bager, strelabagera, geomehanika, stabilnost kosina, ekonomijaBranko M. Petrović. "Optimizacija dužine strele rotornih bagera u funkciji stabilnosti kosina i efektivnosti rada na površinskim kopovima lignita Srbije" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-07-12)
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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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Korelacione zavisnosti parametara zbijanja i nosivosti donjih slojeva saobraćajnica
Milan Bogdanović (2024)Disertacija se bavi korelacionim zavisnostima parametara zbijanja i nosivosti podloge (donji slojevi saobraćajnica). izgrađene od prirodnih sitnozrnih i krupnozrnih materijala. Cilj istraživanja je bio utvrđivanje pouzdanih korelacija između izabranih parametara materijala koji opisuju stanje slojeva podloge što je doprinelo predlogu načina upotrebe i definisanju vrednosti dinamičkog CBR uređaja (CBRd). Ova disertacija prikazuje rezultate opsežnih laboratorijskih i in situ ispitivanja u kojima se procenjuje nosivost materijala pomoću navedenih metoda. Ogromna baza podataka omogućila je razvoj nekih korelacija između različitih statičkih ...korelacija parametara zbijanja i nosivosti, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRdMilan Bogdanović. Korelacione zavisnosti parametara zbijanja i nosivosti donjih slojeva saobraćajnica, Beograd : [M. Bogdanović], 2024
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A Description of Morphological Features of Serbian: a Revision using Feature System Declaration
In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...Cvetana Krstev, Ranka Stanković, Vitas Duško. "A Description of Morphological Features of Serbian: a Revision using Feature System Declaration" in Proceedings of the 5th International Conference on Language Resources and Evaluation, LREC 2010, Valetta, Malta : European Language Resources Association (2010)
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Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)
Miloš Radonjić (2020)This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-BalkanidesMiloš Radonjić. "Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)" in Geologia Croatica, Croatian Geological Survey (2020). https://doi.org/10.4154/gc.2020.13
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Sexual dimorphism and left-right asymmetry of carapace ornamentation in Hemicytheria setosa RUNDIĆ 2002
In biostratigraphic research of the Upper Miocene of the Pannonian Basin System, one of the frequently detected and important ostracod genera is Hemicytheria. Among more than 20 species of this genus, Hemicytheria setosa is present in sandy facies of the Lake Pannon sediments in Serbia and Bosnia and Herzegovina. The aims of this study were to describe sexual dimorphism and differences between left and right valve morphology in Hemicytheria setosa. Landmark based geometric morphometrics is applied on the grounds ...Morfologija ljušture, Ostrakode, geometrijska morfometrija, gornji miocen, južni deo Panonskog basenaVukica Vujić, Ljupko Rundić, Tamara Karan-Žnidaršič. "Sexual dimorphism and left-right asymmetry of carapace ornamentation in Hemicytheria setosa RUNDIĆ 2002" in Geologia Croatica, Croatian Geological Survey (2019). https://doi.org/10.4154/gc.2019.07
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Analysis of the exhaust emissions inventory from auxiliary mining machines
Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović. "Analysis of the exhaust emissions inventory from auxiliary mining machines" in 9th International Conference Mining and Environmental Protection, University of Belgrade, Faculty of Mining and Geology (2023)
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Progress and improvement of the status of groundwater in Serbia, Invited Paper
Dimkić Milan, Stevanović Zoran, Đurić Dušan. "Progress and improvement of the status of groundwater in Serbia, Invited Paper" in Proceedings / IWA Specialist Groundwater Conference, 08-10 September 2011, Belgrade, Serbia, Belgrade: Institute for the Development of Water Resources Jaroslav Èerni (2011): 81-101
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The polarized spectra (400 – 1600 nm) of antigorite from Aldina Reka (Serbia)
Logar Mihovil, Poharc-Logar Vesna, Erić Suzana. "The polarized spectra (400 – 1600 nm) of antigorite from Aldina Reka (Serbia)" in Acta Mineralogica – Petrographica, Abstract Series, IMA 2010 - 20th General Meeting of the International Mineralogical Association 6, Szeged, Hungary:Dept. of Mineralogy, Geochemistry and Petrology, University of Szeged (2010): 664
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Hydrodynamic Model of The Open-Pit Mine “Buvač” (Republic of Srpska, Bosnia And Herzegovina)
Bajić Dragoljub, Polomčić Dušan, Papić Petar, Stojković Jana. "Hydrodynamic Model of The Open-Pit Mine “Buvač” (Republic of Srpska, Bosnia And Herzegovina)" in CD Proceedings of 6th Dubrovnik Conference on Sustainable Development of Energy Water and Environmental Systems,, Dubrovnik: (2011): 25-29
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The Effects of Multi-Word Tagging on Text Disambiguation
Utvić Miloš, Obradović Ivan, Krstev Cvetana, Vitas Duško. "The Effects of Multi-Word Tagging on Text Disambiguation" in Proceedings of the 29th International Conference on Lexis and Grammar, LGC 2010, September 2010, Belgrade, Serbia, D. Vitas and C. Krstev (eds.), Belgrade:Faculty of Mathematics, University of Belgrade (2010): 333-342
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Qualification of open pit mines based on external risks assessment
Milutinović Aleksandar, Miljanović Igor, Panić Biljana. "Qualification of open pit mines based on external risks assessment" in Proceedings of the XI Balkan Conference on Operations Research BALCOR, 7-11.09.2013. - no. -, Beograd, Zlatibor, Srbija:University of Belgrade, Faculty of Organizational Sciences, Belgrade (2013): 705-709
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Kinetics and the mechanism of the supstitution reactions of some Pt(II) and Pd(II) complexes
Bogojeski Jovana, Mijatović Aleksandar, Đurović Mirjana, Petrović Biljana, Bugarčić D. Živadin (2011)Bogojeski Jovana, Mijatović Aleksandar, Đurović Mirjana, Petrović Biljana, Bugarčić D. Živadin. "Kinetics and the mechanism of the supstitution reactions of some Pt(II) and Pd(II) complexes" in First EuCheMS Inorganic Chemistry Conference, University of Manchester, UK (2011): 11-14
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Possibilities for introduction of Bioenergy Village concept - a case study of Serbia
Ivezic Dejan, Gluščević Miodrag, Jerotić Slobodan. "Possibilities for introduction of Bioenergy Village concept - a case study of Serbia" in Proceedings of the 3rd Renewable Energy Sources - Research and Business - BOOK OF ABSTRACTS, Brisel:Wojciech Budzianowski Consulting Services (2018): 53-54
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Application of rough set theory for choosing optimal location for flotation tailings dump
Štirbanović Zoran, Miljanović Igor, Marković Zoran. "Application of rough set theory for choosing optimal location for flotation tailings dump" in Archives of Mining Sciences 58 no. 3, -:Polish Academy of Sciences - Committee of Mining (2013): 893-900. https://doi.org/10.2478/amsc-2013-0062