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1115 items

  • Regulacija nivoa tečne faze u vertikalnim separatorima

    Katarina Šoštarić (2024)
    Ovaj diplomski rad bavi se regulacijom nivoa tečne faze u vertikalnim separatorima u industriji nafte i gasa. U radu su istraženi različiti metodi merenja nivoa, uključujući plovke, ultrazvučne i radarske senzore. Radarski senzori su se pokazali kao najefikasniji u teškim radnim uslovima, zahvaljujući njihovoj visokoj preciznosti i pouzdanosti. Rad uključuje teoretski pregled metoda merenja nivoa, detaljno poređenje prednosti i nedostataka različitih senzora, kao i studiju slučaja implementacije radarskog senzora u vertikalnom separatoru. Analiza rezultata i preporuke za buduća istraživanja ...
    Merenje nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte i gasa
    ... merenje nivoa u vertikalnim separatorima ................ 26 4.4. Studija slučaja: Implementacija sistema za merenje nivoa u vertikalnom separatoru 27 5. Praktična primena ........aaaaa a aaaaaaa a a aaaaaaaeaaaaatakeve 29 5.1. Preporuke za poboljšanje ............aaaaaaa a eeeeeaaeeaaegaNeNeı 29 5 ...
    ... aktivira (deaktivira) odgovarajući relce]J. Plovak se smešta ili uz zid rezervoara ili u posebnoj komori sa spoljašnje strane rezervoara. Slika 5. Postavljanje plovka a) uz zid plovka; b) u posebnoj komori sa spoljašnje strane rezervoara *Izvor: Prezentacija iz predmeta 'Metrologija i standardizacija ...
    ... performanse su praćene tokom nekoliko meseci. Rezultati su pokazali visoku tačnost merenja i stabilnost sistema u različitim radnim uslovima. 28 5. Praktična primena 5.1. Preporuke za poboljšanje Analiza rezultata pokazala je da je implementacija radarskog. senzora značajno poboljšala preciznost ...

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... the previous outcrop, a hundred metres downstream, close to the top of the left Rakovica stream bank (Fig. 5), there is a well-known Badenian sand section (N 44°43′46″, E 20°30′15″ – No. 5 in Fig. 1) up to 10 m high. The first data concerning the “Mediterranean fauna” of the Rakovica Stream (Rakovički ...
    ... both stream banks. The first is observed on the left bank, near to the stream floor (N 44°43′38″, E 20°30′04″ – No.7 in Fig. 1). An outcrop more than 5 m high and up to 20 m long exposes grey to brownish laminated sand and poorly cemented sand- stone in alternation with gray to greenish silty marl (Fig ...
    ... conglomerates (c), semi-rounded pebbles of the quartzites and sandstones (d). G eo lo g ia C ro a ti ca Geologia Croatica 72/2114 Figure 5. The Upper Badenian sands: A well-known Badenian sand section in the upper part of the Rakovica stream (a, b), Persistrombus coronatus (DEFRANCE) (c) ...

  • The impact of temporal variability of groundwater levels on groundwater vulnerability maps in karst terrains – a case example of the Perućac spring catchment area

    Vladimir Živanović, Igor Jemcov, Nebojša Atanacković (2022)
    Groundwater vulnerability maps represent an essential tool for protecting karst groundwater resources. Vulnerability assessment is usually based on spatial evaluation of various parameters that affect the vulnerability degree and regulate the protection role of the unsaturated zone. Most of these parameters, like soil and geology conditions, are constant and do not change during the year or over several years. In contrast, some parameters, such as the groundwater level, depend on the variability of recharge conditions. By considering the variability ...
    karst groundwater vulnerability maps, parameter changes, Perućac spring, Serbia

  • Hydrochemical indicators of groundwater flow in the area of “Čukaru Peki” Cu-Au underground mine in eastern Serbia

    Nebojša Atanacković, Vladimir Živanović, Jana Štrbački, Veselin Dragišić, Ivana Cvejić (2022)
    The physical and chemical properties of groundwater, together with the groundwater levels regime and rock hydraulic properties, are often used to understand and conceptualize the hydrogeological system. Prediction of the influence of mining works on groundwater, and vice versa, is a challenge due to significantly altered groundwater flow patterns in the raw materials exploitation areas in relation to natural conditions. Therefore, multiple parameters are assessed and monitored before and during exploitation to properly characterize and quantify the system for ...
    mine water, hydrogeology, multivariant statistics, groundwater inflow, water quality

  • Characterization of bituminite in Kimmeridge Clay by confocal laser scanning and atomic force microscopy

    Paul C. Hackley, Jolanta Kus, João Graciano Mendonça Filho, Andrew D. Czaja, Angeles G. Borrego, Dragana Životić, Brett J. Valentine, Javin J. Hatcheries (2022)
    This work investigates bituminite (amorphous sedimentary organic matter) in Upper Jurassic Kimmeridge Clay source rock via confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). These petrographic tools were used to provide better understanding of the nature of bituminite, which has been historically difficult to identify and differentiate from similar organic matter types in source rocks. As part of an International Committee for Coal and Organic Petrology (ICCP) working group, an immature (0.42% vitrinite reflectance), organic-rich (44.1 wt% ...
    Битуминит, Kонфокална ласерска скенирајућа микроскопија, Mикроскопија атомских сила, Органска петрологија, Термичка зрелост

  • Complex geophysical survey on solving the problem of water loss in the karst terrain reservoir

    Branislav Sretković, Dejan Vučković (2023)
    Geophysical surveys in karst terrain are always a specific challenge. Each of them requires a careful consideration of the problem, specific conditions on the ground, the selection of adequate methods applicable in that specific and unique karst area. But they should have one thing in common: a complex approach and looking at the problem from wider to narrower, with a gradual narrowing of the investigation area, increasing the spatial precision and resolution of the obtained data. On the example of ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... coordinates. The panel on the left side of Figure 5 shows basic information for the abandoned mine on the location Gaj within the Municipality of Kovin, while the right side represents the multimedia data panel for the same mine.      Figure 5. The panels showing basic information and multimedia ...
    ... individuals; and (e) facilitating economic planning of sustainable development of Vojvodina, as a compatible part of sustainable development of Serbia [5]. 2. Results The “Cadastre of Abandoned Mines in the Territory of AP Vojvodina” project was developed at Faculty of Mining and Geology, University ...
    ... filtering according to given criteria. The level of access to data and the possibilities for editing depend on privileges that are Energies 2016, 9, 567 5 of 14 assigned to a particular user. For each user, the system keeps track of the user name, first name, surname, date of activation of the user account ...

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Modeliranje disperzije dimnih gasova iz termoelektrane Kostolac B

    Bojan Živanović (2024)
    Bez hrane se može preživeti nedelju dana, bez vode svega nekoliko dana, međutim, bez vazduha se može preživeti najmanje, nekoliko minuta. Pitanje je kakav uticaj na zdravlje čoveka i okoline ima vazduh koji je lošeg kvaliteta, a kojem je skoro celokupno stanovništvo planete izloženo? Ovaj rad se bavi problematikom modeliranja disperzije dimnih gasova iz novog bloka B3 TE ,,Kostolac’’ B. Ključni momenti koji će biti predstavljeni jesu zagađenje, zdravstveni efekti, modeliranje disperzije i analiza dobijenih rezultata korišćenjem programa AERMOD. Analiziran ...
    zagađenje vazduha, podizanje perjanica, modeliranje disperzije polutanata, TE ,,Kostolac B’’
    ... široku potrošnju. Sadašnji projektni kapacitet PK Drmno iznosi 9x10* t/god. /75.] U sledećoj tabeli 5. su prikazane karakteristike uglja sa PK Drmno za potrebe projektovanja TE KO B3. /75.} Tabela 5. Karakteristike uglja sa PK Drmno za potrebe projektovanja bloka TE KO B3 [15.] Karakteristike ...
    ... aaa a nanaaaaakane 33 4.2. Gausova disperzija .. nanaanaaaaaaaaaaNaatakve 34 4.3. Najčešće korišćeni modeli.............aaaaaaa a aanaakane 36 5. TERMOELEKTRANA KOSTOLAC B ... aaaaanaananaatakakek 40 5.1. Princip rada termoelektrane........aaaaa a oaaaaakane 41 5.2. Karakteristike bloka B3 ...
    ... Životnu sredinu, izazvano ljudskom delatnošću ili prirodnim procesima, koje imaju ili mogu imati štetne posledice po životnu sredinu i zdravlje ljudi. /5.] Bez obzira da li se radi o zagađenju vazduha, vode ili zemljišta, zagađenje po definiciji podrazumeva degradaciju, tj. gubitak na kvalitetu sa izrazitim ...

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... system for planning, monitoring and management of mine exploitation, indicated that such resources would greatly contribute to their functionality [5]. The only available multilingual terminological resource in printed form involving Serbian is a Dictionary of mining in five languages (Serbian ...
    ... Geostatistics Geostatistički rečnik 5. CONCLUSION The terminological resource features offered by Moodle in the form of its glossaries can serve as an initial form for development of ...
    ... Use of Ontologies to Annotate and Retrieve Educational Contents: the AquaRing Approach, JE-LKS, Journal of e-Learning and Knowledge Society — Vol.5, No.1, pp.211-220, 2009. [2] Bouzeghoub, A. Elbyed, A., Ontology Mapping for Web-Based Educational Systems Interoperability, IBIS – International ...

  • The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines

    Krstev Cvetana, Stanković Ranka, Vitas Duško, Obradović Ivan (2008)
    In this paper we present how resources and tools developed within the Human Language Technology Group at the University of Belgrade can be used for tuning queries before submitting them to a web search engine. We argue that the selection of words chosen for a query, which are of paramount importance for the quality of results obtained by the query, can be substantially improved by using various lexical resources, such as morphological dictionaries and wordnets. These dictionaries enable semantic ...
    LR web services, MultiWord Expressions & Collocations, Information Extraction, Information Retrieval
    ... relations. Thus a query with the word Engleska ‘England’ can be expanded with Englez ‘Englishman’, Engleskinja, ‘English woman’ but also with Albion. 5. The inflection of free phrases by predicting their syntactic structure. Our presumption is that many free phrases used for search will have the same ...
    ... synonyms can be added: {strike, work stoppage}. The bilingual search is, however, done separately and the results are presented in two columns. 5. Technical implementation The developed web application receives the user query, and subsequently uses the local web service WS4QE to expand the ...
    ... once more omitted. The result of the expanded query was a total of 160,000 documents as opposed to 66,600 obtained by the unexpanded query (Figure 5). The expanded query once again doubled the number of documents obtained. Finally, a second query was performed for the word istraživač. This time ...

  • OntoLex Publication Made Easy: A Dataset of Verbal Aspectual Pairs for Bosnian, Croatian and Serbian

    Ranka Stanković, Maxim Ionov, Medina Bajtarević, Lorena Ninčević (2024)
    Ovaj rad predstavlja novi jezički resurs za pretraživanje i istraživanje verbalnih aspektnih parova u BCS (bosanskom, hrvatskom i srpskom), kreiran korišćenjem principa Lingvističkih Povezanih Otvorenih Podataka (LLOD). Pošto ne postoji resurs koji bi pomogao učenicima bosanskog, hrvatskog i srpskog kao stranih jezika da prepoznaju aspekt glagola ili njegove parove, kreirali smo novi resurs koji će korisnicima pružiti informacije o aspektu, kao i link ka aspektnim parovima glagola. Ovaj resurs takođe sadrži spoljne linkove ka monolingvalnim rečnicima, Wordnetu i BabelNetu. ...
    aspekt glagola, lingvistički otvoreni podaci, BCS

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Zbirka rešenih zadataka iz termodinamike

    Marija Živković, Aleksandar Madžarević (2023)
    termodinamika
    ... rad je jednak površini pravouglog trapeza, kako je prikazano na slici: 71TOPLOTNI KAPACITET - PRVI ZAKON TERMODINAMIKE ZADACI: 38 - 39 39. 5 kg azota (idealan gas) nalazi se u cilindru sa pokretnim klipom (pogledaj skicu). U početnom trenutku azot se nalazi na pritisku 800 kPa i tempe- raturi ...
    ... zadatak 39: Prikaz procesa u p-v dijagramu 116 ZBIRKA REŠENIH ZADATAKA IZ TERMODINAMIKE 56. Dimni gas molarnog sastava 12% CO 2 , 6% H 2 O , 5% O 2 i 77% N 2 , počet- nog stanja 0,9 MPa i 1000 °C izentropski ekspandira u turbini do pritiska 0,1 MPa, a zatim se izobarski hladi do 150 °C ...

  • Hydraulic impact of pressure transients from water conveyance tunnel on the complex hydrogeological system: A case study HPP

    Igor Jemcov, Maja Todorović, Aleksandar Jemcov, Marina Ćuk Đurović (2024)
    Tunel pod pritiskom, Unutrašnji pijezometri, Tranzijenti pritiska, Karstna izdan, Pukotinska izdan, Hidraulički odziv
    ... study HPP Pirot, Serbia Igor Jemcov ”, Maja Todorović ', Aleksandar Jemcov P, Marina Ćuk Đurović ? 2, i Show more V — Addto Mendeley < Share 5 Cite https://doi.org/10.1016/j.jhydrol.2024.132068 A Get rights and content 2 Highlights • Anovelapproach included the installation of probes ...
    ... system influenced by WMO transients; (4) afault-controlled zone of deep hypogene karst aquifer discharge highly influenced by WMOo transients; and (5) an aquifer with a dominant development of the karst conduit system highly influenced by WMO transients. The study highlights the significance of ...

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... Cenozoic volcanic and volcanoclastic rocks Eastern Vardar ophiolites | Cenozoic plutones |_____ Post-Cambrian' -- ii d 5 š H |_____ Cretaceous sediments |_ pre-Ordovician. 5 % Jurassic-Cretaceous magmatic rocks |} Lower Complex Lž F:| |00 Permo-Triassic magmatic rocks [I eastern Veles series ...
    ... is typi- cally represented by various schists, phyllites, and quartz- ites (Dimitrijević 1967). Peak metamorphic conditions of 450—500 "C at 3—5 kbar (0.3-0.5 GPa) were reported in the pre-Ordovician Vlasina (Milovanović et al. 1988; Vasković 2002). However, relicts. of metamorphic assemblages ...
    ... of the Lower Com- plex is characterised by predominantly shallow dipping Int J Earth Sci (Geol Rundsch) (2017) 106:1665–1692 1671 @ \N, s N=5 Western part ofthe Lower Complex Vrvi Kobila area N Umin N=19 imylonitc • lneadon N shear-zone % foliation foliation outside" % ihe ...

  • Утицај соларне активности на здравље човека

    Каролина Ђукић, Весна Цветков, Весна Дамњановић (2019)
    ... formiranja, zemaljski izvori su odgovorni za najveći deo doze kojoj je čovek izložen tokom života. U normalnim uslovima zemaljski izvori emituju više od 5/6 godišnje efektivne ekvivalentne doze koju apsorbuju pojedinci. Preostali deo prirodnog jonizujućeg zračenja čine kosmička zračenja. Danas je fon ...
    ... cal, Biological and Ecological Systems: Some Major Results of Complex Investigations Conducted in Azerbaijan. Sun and Geosphere, 1(1), 17-22. [5] Babayev, E.S. (2008) Solar and Geomagnetic Activities and Related Effects on the Human physiological and Cardio-Health State: Some Results of Azerbaijani ...

  • Single and multi-phase inclusions in garnets from the Lešnica alluvion in the Internal Dinarides, Serbia

    Maja Milošević, Bojan Kostić (2021)
    ... together with uranium oxide minerals. Other single-phase inclusions are oftenquartz and rutile. Size of inclusion varieties from grain to grain, between 5 and 40 µm, while theirdistribution doesn’t follow any pattern, random distribution. It has been noted that zircon anduranium oxide minerals are often ...

  • Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia

    Predrag Radović, Miloš Radonjić, Emmanuel Billia (2020)
    Finds of Pleistocene rhinoceros are rare in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East ern Serbia). Both the morphological and metric characteristics of the teeth are consis tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no ...
    rhinoceros, Stephanorhinus hundsheimensis, Serbia
    ... Skeleton 2013/0282/0001 (Natural His- tory Museum Vienna, Austria). Type locality and horizon. Hundsheim (Lower Austria), early Middle Pleistocene (MIS 15-13). Occurrence. Latest Villafranchian and Galerian, late Early and early Middle Pleistocene of Europe (1.4–1.2 Ma until 0.6–0.5 Ma), and possibly ...
    ... Nenadić (2008), while Vislobokova and Agadjanyan (2016) dated these layers to post-Villafranchian times (i.e., the early phase of the Middle Pleistocene, MIS 19). In addition, Vislobokova and Agadjanian (2015) reported a few more isolated rhinoceros teeth from the lower levels (Layers 10 and 11) at Trlica ...
    ... graphically, the closest record of S. cf. hundshei- mensis comes from Layers 5 and 6 of Trlica near Pljevlja in northern Montenegro (Dimitrijević, 1990, 1996; Codrea and Dimitrijević, 1997). Based on the finds of small mammals, Layers 5 and 6 were cor- related with the Mimomys savini-pusillus Zone of the Early ...

  • Preparation of Multimedia Document “YU Rock Scene”

    Milena Obradović, Aleksandra Arsenijević, Mihailo Škorić (2017)
    SUMMARY: This study will present the preparation process of a multimedia document entitled YU ROCK SCENE in which participants were senior students of undergraduate studies of the Department of Library and Information Science at the University of Belgrade Faculty of Philology during the academic year 2014/2015, as a part of the subject Multimedia Documents. This study gives an overview of the historical development of rock and roll in the territory of the former Yugoslavia, rock scene in Yugoslav republics, ...
    multimedia document, library science, information science, rock and roll, music, Yugoslavia
    ... Zlatni dečaci, Elipse, Korni grupa, Porodična manufaktura crnog hleba, Dogovor iz 1804., Iskre, Crni Biseri, Duet Vlada i Bajka, Džentlmeni, Plamenih 5 and Siluete. Solo performers also appeared on the scene, some of whom were mem- bers of some of the said music groups, such as Mile Lojpur, Perica S ...
    ... Nikola Kanjevac and many others. Radio Belgrade broadcasted popular shows, such as: Zeleni megaherc, Veče uz radio, Pri- jatelji zvezda, Sastanak u 9 i 5, To je samo rokenrol. Radio Belgrade 202 broadcasted Ventilator and Hit 202 While Diskomer was broadcasted by Studio B. Radio Novi Sad broadcasted Randevu ...
    ... magazines, filmography, radio and TV shows, record publishers, books and controversies which the Yugoslavian rock scene made and influenced. Figure 5. Example of photo viewing inside the gallery Pages about social aspects of rock and roll contain articles written by students, as well as multimedia ...