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Упит dcterms_subject_txt:hirdoelektrana „Đerdap 1“

4955 items

  • Ocena preostalih radnih mogućnosti rotornog bagera metodom primenjene ekspertske ocene sa empirijskim faktorom korekcije - Remaining operational capabilities evaluation of bucket wheel excavator by application of expert assessment method with empirical co

    Polovina Dragan, Ivković Slobodan, Ignjatović Dragan, Tanasijević Miloš (2010)

  • The origin of Mg sulphate and other salts formed on pure calcium carbonate substrate - Tufa stone blocks built into the Gradac Monastery, Serbia

    Erić Suzana, Matović Vesna, Kremenović Aleksandar, Colomba Philippe, Srećković- Batoćanin Danica, Nešković Marina, Jelikić Aleksa (2015)

  • New insights on the geochemical affinity and age of mineralized rocks in Timok magmatic complex, East Serbia

    Miloš Velojić, Dina Klimentyeva, Quadt von, Marcel Guillong, Frank Melcher, Thomas Meisel, Dejan Prelević (2023)
    Бор, Чукару Пеки, Борска металогенетска зона, адакити, циркони

  • Basalt-polyester hybrid composite materials for demanding wear applications

    Faisal Abusahmin, Ahmed Algellai, Nataša Tomić, Marija Vuksanović, Jelena Majstorović, Tatjana Volkov-Husović, Vladimir Simić, Radmila Jančić-Heinemann, Marinko Toljić, Jovan Kovačević (2020)
    Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites

  • English for Geology Students 2 - Dyslexia friendly

    Lidija Beko (2023)
    Engleski jezik

  • INVENTS: A Hybrid Mine Ventilation Planning and Design System

    Lilić Nikola, Stanković Ranka, Obradović Ivan (2013)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    hybrid systems, mine ventilation, expert systems
    ... Automation Control and Applied Informatics Paper 23 INVENTS: an hybrid system for subsurface ventilation analysis LILIĆ, Nikola 1 , STANKOVIĆ, Ranka 2 & OBRADOVIĆ, Ivan 3 1, 3 Professor, Faculty of Mining and Geology, University of Belgrade, Djusina 7, 11.000 Belgrade 2 Bsc, Faculty of Mining and ...
    ... methodology of the hybrid system INVENTS, as well as system structure and user interface. Keywords: hybrid systems, mine ventilation, expert systems 1. Introduction The methodology of mine ventilation planing and design in contemporary mine theory and practice differs substantially from the traditional ...
    ... of mine ventilation planing and design. Ventilation design is just one element or phase of the novel design approach. The component diagram on Fig.1 illustrates the proposed method that can be divided into six separate components. The first phase of the outlined methodology is data acquisition. In ...

  • INVENTS: a hybrid system for subsurface ventilation analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    ... Automation Control and Applied Informatics Paper 23 INVENTS: an hybrid system for subsurface ventilation analysis LILIĆ, Nikola 1 , STANKOVIĆ, Ranka 2 & OBRADOVIĆ, Ivan 3 1, 3 Professor, Faculty of Mining and Geology, University of Belgrade, Djusina 7, 11.000 Belgrade 2 Bsc, Faculty of Mining and ...
    ... methodology of the hybrid system INVENTS, as well as system structure and user interface. Keywords: hybrid systems, mine ventilation, expert systems 1. Introduction The methodology of mine ventilation planing and design in contemporary mine theory and practice differs substantially from the traditional ...
    ... of mine ventilation planing and design. Ventilation design is just one element or phase of the novel design approach. The component diagram on Fig.1 illustrates the proposed method that can be divided into six separate components. The first phase of the outlined methodology is data acquisition. In ...

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... between the actual and predicted results. The MCC ranges from -1 to 1: 1 indicates a perfect correlation (all predictions are correct), 0 indicates no correlation (no relationship between predictions and actual results), -1 indicates a perfect negative correlation (all predictions are incorrect) ...
    ... , 1.e., its edges, or from its internal characteristics. Given that dynamometric cards are closed contours that can be treated as images or symbols, representing the shape via In contour-based shape description, in a sequence of ordered pairs (x0, y0), (x1, y1), (x2, y2), ..., GN-1, yN-1), each ...
    ... good result compared to other studies. Group C ” 96315 [1 “ 0.9462 ' | s| ~ Founer -- [ B; MAccuracy MFIMacro w MCC || 095383 09452 0%08 0\940 090257 0902 i 09 08613 03017 079673 [1] 073832 . o |' i a xs | 04 03 [1 Founet avele ı D Nel 086137 Wavel Loxds + Xgh Fo ...

  • Vebran Web Services for Corpus Query Expansion

    Ranka Stanković, Miloš Utvić (2020)
    U ovom radu se govori o razvoju veb usluga Vebran i njihovoj primeni u poboljšanju pretraživanja korpusa. Veb-servisi Vebran koriste se za konsultovanje spoljnih leksičkih izvora za srpski jezik (uglavnom elektronski morfološki rečnici i srpski Vordnet) i proširivanje korisničkih upita radi dobijanja relevantnijih rezultata iz srpskih korpusa.
    corpus search, web service, Serbian lexical resources, query expansion
    ... Wordnet”. Romanian Journal of Information Science and Technology Vol. 7, no. 1–2 (2004): 147–161 Paumier, Sébastien. Unitex 3.1 User Manual, 2016, accessed August 1, 2019. http://releases.unitexgramlab.org/3.1/man/Unitex-GramLab-3. 1-usermanual-en.pdf Rizov, Borislav and Tsvetana Dimitrova. “Hydra for Web: ...
    ... category values: s-singular, p-plural, 1..7 — case restrictions, etc. fleksije false indicator whether the result contains only lemmas X or their inflectional forms as well (true, false) dlfByLemma false indicator of output format (forms grouped by lemma or not) Table 1. Parameters for morphological expansion ...
    ... of Belgrade Faculty of Mining and Geology Miloš Utvić milos.utvic@fil.bg.ac.rs University of Belgrade Faculty of Philology Belgrade, Serbia 1 Introduction It is generally known that users typically formulate very short instead of long and complex queries. The lemmatization of corpora enables ...

  • Fault type assessment based on vertical gravity gradient anomalies – advantages and limitations

    Ivana Vasiljević, Snežana Ignjatović, Branislav Sretković (2024)
    The type of dip-slip faults can be assessed based on the analysis of vertical gravity gradients. Theoretically, just a simple comparation of the gradient extreme values can give us an answer whether the fault is normal or reverse (thrust). Practical application of this method is far more complicated and the results depend on a number of parameters, such as a complexity of geological setting, the quality of gravity data, dip angle and displacement of the fault, density contrast, etc. ...
    dip-slip faults, vertical gravity gradients, field data analysis
    ... Four basic situations connected to the inclined faults are presented on Fig. 1 and Fig. 2, though some authors (Essa et al., 2021) differentiate more types of faults in relation to their gravity response. Fig. 1 shows the more common situation, the case where the lower density block was above ...
    ... Fifth Congress of Geologists of the Republic of North Macedonia 30 . Uzz [10" s?] (a) x [km] 1:) Ao = 0.3 g/cmš 30 – Uzz [10% s?}] -30 - a H | x{[km] 10 -- |22 Aoc = 0.3 g/cm? Figure 1. Vertical gravity gradient (Uzz) curves over (a) normal fault and (b) reverse fault with positive ...
    ... TEOXHJIPOHH?KMHEPHHT JIOO TEOXMHJIPOHH?)KEHEPHHT JIOO - Ckonje TEOMHHTI MK - Ckornje XHB XHJIPOHH?KEHEPHHT JIOOE]JI - Birona CO/[P/XHHA / CONTENTS 1. PeruoHajna reojtoorujara, Crparurpa(buja u IIanaeoHrojtoruja AHTPOLIIOIIEH Pbyaaoico boee MORPHOMETRY OF PALEOCHANNELS – THE KEY TO DIAGNOSTICS ...

  • Primjena magnetometrijskih ispitivanja na arheološkom lokalitetu Nedeljkova humka

    Mirko Petković, Vesna Cvetkov, Milorad Ignjatović, Dejan Naumov (2020)
    ... predstavljene crvenom, minimalne vrijednosti plavom, a vrijednosti u opsegu od ±1 [nT/m] bi- jelom bojom čime je maskirana dozvo- ljena greška instrumenta. Gradiometrij- ske karte oba lokaliteta prikazane su na Slici 1. Da bi se sa karti odstranile ano- malije posledice dubljeg zazora na tere- nu ...
    ... detektovane gradio- metrom uglavnom leže u prva dva me- tra, u rijetkim slučajevima do tri. Ako je anomalija arheološkog objekta 10 [nT] na rastojanju od 1 [m], onda ona na 2 [m] iznosi 1,25 [nT], a na rastojanju od 3 [m] je svega 0,37 [nT]. To je na granici detektabilosti za većinu instrumenata, što ...
    ... al. 2018). Magnetometrijska akvizicija vr- šena je duž profila orijentisanih u prav- cu SSI-JJZ, prateći pravac oranja, na međusobnom rastojanju 1 [m]. Profili su mjestimično pogušćeni na 0,5 [m] na prostorima gdje su prilikom mjerenja uočene povećane vrijednosti vertikal- nog gradijenta totalnog ...

  • Хидротермалне промене у издвојеним стратиграфским јединицама у бушотини јужно од Бора

    Павле Јовичић (2024)
    Анализом уступљених узорака из истражне бушотине јужно од Бора, од стране компаније Serbia Zijin Mining, утврђене су хидротермалне промене (алтерације) које прате стратиграфске чланове набушене самом бушотином. Установљене алтерације директно осликавају класично развиће порфирског Cu система, при чему је указано на њихову повезаност са минерализацијом, као и на потенцијалност самог истражног простора којем изабрана бушотина припада.
    Бор, хидротермалне промене, порфир

  • Rietveld crystal structure refinement of a natural rhombohedral grossular-andradite garnet from Serbia

    Pavle Tančić, Aleksandar Kremenović (2022)
    Four macroscopically visible B–E (rim) zones, within a large natural ferric grossular garnet of Grs58–64Adr36–42 Sps2 composition, are described by means of Rietveld refinements of the crystal structures in a series of six space groups, followed by com parative analysis of the R-values, site occupancy factors, and bond lengths and angles. The garnet crystallized in the rhombohedral R63c space group. Various polyhedral distortions and structural or derdis or dervariations between the zones studied are also described and discussed. The ...
    Geology

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... Živković marija.zivkovic@rgf.bg.ac.rs 1 University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia http://orcid.org/0000-0003-2659-0662 http://crossmark.crossref.org/dialog/?doi=10.1007/s10098-021-02063-6&domain=pdf M. Živković, D. Ivezić 1 3 Graphic Abstract Keywords Sewage wastewater ...
    ... effects of utilizing wastewater heat can be evaluated. Fig. 1 Methodology for evaluation of effects of full recoverable wastewater heat energy potential utilization in district heating systems with heat pumps M. Živković, D. Ivezić 1 3 Key performance indicators For the evaluation, comparison ...
    ... values of key performance indicators of the current state of the district heating systems are given in Table 1. Utilizing sewage wastewater heat in district heating systems in Serbia: effects on… 1 3 High values of the primary energy factor (1.52) and the carbon dioxide emission coefficient (328.3 kg/MWh) ...

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... can be classified accordingly, on basis of their functionality, processing architecture and communication needs (fig.1). Function-replacing Intercommunicating Polymorphic Fig.1 Three proposed hybrid classes Hybrid systems belonging to the first class are associated with particular methods: ...
    ... systems. Key words: hybrid intelligent systems, coupled systems, artificial intelligence methods, mining applications of artificial intelligence 1. Introduction AI methods and techniques, such as experts systems, case-base reasoning, machine learning, neural networks or genetic algorithms have ...
    ... only a particular class of problems. Complex problems often cannot be solved by any of the existing AI methods alone. Hybrid intelligent systems [1] are an attempt to solve these complex problems by coupling two or more AI methods, but also by integrating AI methods and conventional computer systems ...

  • Geneza i uslovi cirkulacije voda kompleksnih karstnih sistema Kučajsko-Beljaničkog masiva

    Ljiljana M. Vasić (2017-07-14)
    postupaka koji je primenjen u cilju definisanja zona prihranjivanja i veze izmeđupodzemnih i površinskih voda, vremena koje voda provede u podzemlju, pri čemu seformira jedinstven hemijski sastav i temperaturni režim isteklih voda, bili su polaznaosnova za usmerenje na istraživanje karsta i definisanje teme doktorske disertacije.Kučajsko-beljanički masiv se nalazi u istočnoj Srbiji i pripada oblasti Karpatobalkanskogluka i idealan je poligon za istraživanje, obzirom da se u okviru njega nalazejaka karstna vrela i pojave toplih karstnih izvora na relativno malom rastojanju, ...
    karstni sistemi, geneza podzemnih voda, izotopske metode, starost voda,hidrogeohemijski procesi, dubina cirkulacije podzemnih voda, subtermalne i termalnevode
    ... Februar Mart April Oktobar Decembar 1 7 37 2 7 36 1 3 6 36 8 5 4 4 37 11 10 5 4 37 14 10 6 2 38 14 10 7 1 36 9 10 8 1 30 7 9 9 0 24 3 9 10 19 4 30 11 11 6 42 12 7 4 38 13 5 1 36 14 4 35 15 0 34 16 0 1 31 17 1 18 26 18 14 20 19 18 ...
    ... jednačinom (1), a odnos molova (Ca2++Mg2+)/HCO3 - iznosi 1:2 (slika 8.8.). (Ca1-x Mg)CO3+H2O+CO2→(1-x)Ca2++xMg2++2HCO3 -（1） U slučaju rastvaranja karbonata azotnom ili sumpornom kiselinom, važe jednačine (2) i (3), a kada odnos molova (Ca2++Mg2+)/HCO3 - u oba slučaja iznosi 1:1. Kako na se ...
    ... 2.4 0.6 0 0.1 0 23 1 5.5 0 0 0.5 0.1 0 7 0 11.1 4 0 24 10.1 3.2 0 0 6.9 0 0 1 0.1 1 7.1 0 25 7.3 0.8 0.1 0 19.2 3.5 0 0.2 0 0 13.9 0 26 2 6.6 1.1 0 25 2.5 0 0.2 3.9 0 7.9 0 27 0.3 8 0 0 0.5 7.6 0 0.3 0.3 0 2.7 0 28 4.8 0.2 13 0 6.7 0.1 1 0 12.6 0 13.3 0 29 0.1 4.2 10 0 0 1 0 2.1 0 0.5 0 30 0 ...

  • Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Nikola Simić, Jelena Majstorović (2024)
    During construction of buildings in urban areas, sometimes there is a need to blast solid rock mass in the immediate vicinity of the surrounding buildings. In that case, the aim is not only to increase the efficiency of blasting, but also to reduce harmful effects of ground vibration induced by blasting. At the same time, it is very important to protect the buildings located in the safe zone from the blast site as well as remaining rock mass around ...
    expansive mortar, artificial screens, pressure, rock breaking, building foundation

  • Regionalno-geološke karakteristike miocenskih sedimenata na prostoru severnog Banata

    Dejan N. Radivojević (2014-12-30)
    Predmet doktorske disertacije predstavljalo je rešavanje strukturno‐stratigrafskihodnosa miocenskih sedimenata na prostoru severnog Banata. U cilju regionalnogsagledavanja, korišćeni su svi raspoloživi geofizički i geološki podaci sa širegistražnog područja, odnosno iz celog Panonskog basena i susednog orogena. Osimklasičnih metoda primenjene su i savremene metode seizmostratigrafije,tektonostratigrafije i riftne sekvencione stratigrafije. Primenjene metode omogućilesu izradu modela progradacije ivice šelfa za ceo Panonski basen, modela uzajamnihveza između basena i geodinamičkog modela jugoistočnog oboda basena.Jezero Panon je većim delom zapunjeno prilivom sedimenata paleo‐Dunavom saseverozapada, odnosno ...
    Centralni Paratetis, Panonski basen, miocen, jezero Panon,seizmostratigrafija, sekvenciona stratigrafija, paleogeografija, geodinamika
    ... pad padine dubina preneogene podloge 0 1 2 3 4 5 6 7 8 km 4 3 3 3 3 4 5 5 6 6 2 2 2 2 1 2 2 2 2 2 0 2 2 2 2 2 2 2 2 2 2 1 1 1 2 1 1 1 1 2 2 1 1 1 1 1 0 0 2 2 1 56 6 5 4 4 4 3 3 32 4 2 1 1 1 1 1 2 1 1 1 3 3 3 2 3 3 7 Dunav D un av ...
    ... , Miozän der Zentralen Paratethys, v. 1, p. 1–312. Cicha, I., F. Rögl, C. Rupp, and J. Ctyroka, 1998, Oligocene – Miocene foraminifera of the Central Paratethys, Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft, v. 549, p. 1–325. Cicha, I., F. Rögl, and J. Ctyroka ...
    ... Intra‐Carpathian area: a review, Acta Vulcanologica, v. 7, p. 1–13. Csontos, L., and A. Vörös, 2004, Mesozoic plate tectonic reconstruction of the Carpathian region, Palaeogeogr., Palaeocl., Palaeoecol., v. 210(1), p. 1–56, doi:10.1016/j.palaeo.2004.02.033. Csontos, L., A. Nagymarosy ...

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... Faculty of Mining and Geology (FMG) - University of Belgrade, as complementary to traditional face-to-face instruction 1 1 The research outlined in this paper was supported by the Serbian Ministry of Education and Science grant #III47003. ...
    ... who are course administrators. Thus, for example, Figure 2 shows the number of accesses to FMG Moodle platform per month, from October 1, 2010 to August 1, 2011, by the following user categories: administrators, lecturers and students. Figure 2: Statistics of access to Moodle server ...
    ... concurrent view of activities for several courses. Figure 3 depicts the 10 most visited courses on the FMG Moodle platform from October 1, 2010 to August 1, 2011. The process of creating and populating a course is in general complex and time consuming, which makes course backup extremely ...