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Упит dcterms_subject_txt:open-cast coal mine

565 items

  • Transformer-Based Composite Language Models for Text Evaluation and Classification

    Mihailo Škorić, Miloš Utvić, Ranka Stanković (2023)
    Parallel natural language processing systems were previously successfully tested on the tasks of part-of-speech tagging and authorship attribution through mini-language modeling, for which they achieved significantly better results than independent methods in the cases of seven European languages. The aim of this paper is to present the advantages of using composite language models in the processing and evaluation of texts written in arbitrary highly inflective and morphology-rich natural language, particularly Serbian. A perplexity-based dataset, the main asset for the ...
    General Mathematics, Engineering (miscellaneous), Computer Science (miscellaneous)

  • Fourth Summer Datathon on Linguistic Linked Open Data

    Tijana Radović, Ranka Stanković (2023)
    The 4th Summer Datathon on Linguistic Linked Open Data (SD-LLOD-22) was held in Spain, in Cersedilla near Madrid, in May 2022, and organized by the COST Action NexusLinguarum. The school gathered interested researchers, academics, students who wanted to acquire and/or expand their knowledge in the field of linguistic linked data science. During the school, a spectrum of topics from the field of linked data was presented, from various ontologies, through document integration, annotation and natural language text processing tools ...
    linguistic linked open data, sentiment analysis, linked data, RDF

  • Model za optimizaciju graničnog saržaja metala u rudi u funkciji dugoročnog planiranja površinskih kopova

    Daniel P. Kržanović (2016-06-14)
    Optimizacija graničnog sadržaja metala u rudi jedan je od osnovnih koraka u planiranju i dizajniranju površinskih kopova i ima za cilj postizanje maksimalne neto sadašnje vrednosti (NPV). Iz tog razloga, optimizacija graničnog sadržaja i danas je predmet mnogih istraživanja u rudarskoj nauci, sa ciljem rešavanja praktičnih problema u eksploataciji ležišta.Dugoročno planiranje eksploatacije na površinskim kopovima podrazumeva sagledavanje svih relevantih parametara i faktora (geologije rudnog ležišta, tehnologije proizvodnog procesa, kapaciteta otkopavanja i prerade, troškova, cena metala, iskorišćenja i dr) kako ...
    površinski kop, dugoročno planiranje, optimizacija graničnog sadržaja, maksimizacija neto sadašnje vrednosti (NPV).
    ... W., Kuchta, M., 1995, Open pit mine planning and design, Balkema, Rottherdam, pp. 427-442. Hustrulid, W., Kuchta, M., 1998, Open Pit Mine Planning and Design, A.A. Balkema, Rotterdam, Netherlands, vol. 1, ISBN 9054101814. Hustrulid, W., Kuchta, M., 2006, Open Pit Mine Planning and Design – Volume ...
    ... Profitability Sensitivity Analysis of a Mining Venture, Mine Evaluation Seminar at the University of Minesota. Bernabe, D., Dagdelen, K., 2002, Comparative analysis of open pit mine scheduling techniques for strategic mine planning of TINTAYA copper mine in Peru, SME Annual Meeting. Berry, E.S., 1922 ...
    ... Caccetta, L., Hill, S.P., 2003, An Application of Branch and Cut to Open Pit Mine Scheduling,. Journal of Global Optimization, vol. 27, pp. 349 – 365. Caccetta, L., Hill, S.P., 1999, Optimization Techniques For Open Pit Mine Scheduling, School of Mathematics and Statistic, Curtin University of ...

  • The influence of structural modification of Pd(II) pincer-type complexes on the kinetics of substitution reactions

    Snežana Jovanović Stević, Snežana Radisavljević, Aleksandar Mijatović, Biljana Petrović, Ana Kesić (2023)
    This mini-review summarizes the kinetic data obtained for the substitution reactions of some palladium(II) complexes containing bis-pyrazolylpyridine derivatives as pincer-type ligands with biologically significant nitrogen- and sulfur-donor biomolecules as nucleophiles. Three structurally different palladium(II) complexes were selected: [Pd(L1)Cl]+ (Pd1), [Pd(L2)Cl]+ (Pd2) and [Pd(L3)Cl]+ (Pd3) (where L1 = bis(2-(1H-pyrazol-1-yl)ethyl)amine, L2 = 2,6-bis(5-(tert-butyl)-1H-pyrazol-3-yl)pyridine, and L3 = 2,6-bis(5-(tert-butyl)-1-methyl-1H-pyrazol-3-yl)pyridine, while for the entering nucleophiles were used thiourea (Tu), L-methionine (L-met), and guanosine-5’-monophosphate (5’-GMP). Kinetic measurements were carried out for all systems as pseudo-first ...

  • Određivanje prostorne distribucije vrednosti hidrauličkih parametara izdani: primer površinskog kopa „Radljevo“

    Dragoljub Bajić, Dušan Polomčić, Jelena Ratković, Predrag Pajić (2019)
    Najčešće se kalibracija hidrodinamičkih modela vršila manuelno - „probanjem“ sa različitim vrednostima hidrauličkih parametara i hidrauličkih karakteristika graničnih uslova. Ovakav način rada zahteva veliko znanje i iskustvo eksperta, pri čemu ostaje otvoreno pitanje da li dobijeno rešenje ima optimalan skup parametara. Primenom optimizacione metode, koja se zasniva na Gauss-Marquardt-Levenberg-ovom algoritmu, i PEST softvera, ...
    kalibracija hidrodinamičkog modela, PEST, koeficijent filtracije

  • Анализа утицаја искоришћења у преради на резултате оптимизације површинских копова

    Стефан Митић (2024)
    Одређивање оптималних граница површинског копа је сложен и итеративни процес који захтева мултидисциплинарну експертизу, софистициране технике анализе и пажљиво разматрање геолошких, рударских, економских,техничких, еколошких и друштвених фактора. Оптимизација подразумева генерисање серије шкољки, површинског копа на основу различитих фактора прихода (Revenue factor) са итеративним кораком промене цене метала у односу на базну цену. Свака генерисана шкољка представља инкрементално повећање запремине резерви према инкременталном повећању продајне цене метала. Велики број техно -економских фактора утиче на овај процес, и промена сваког од њих ...
    оптимизација површинског копа, анализа границе копа, оптимална контура копа, лежиште Бувач, профит, искоришћење у преради, трошкови прераде руде
    ... Multi-mine Better Than Multiple Mines. Perth, Orebody Modelling and Strategic Mine Planning Symposium. 10. Hartman, H. L., 1992. SME Mining Engineering Handbook. Littleton, Colorado: Society for Mining, Metallurgy, and Exploration, Inc.. 11. Hustrulid W, Kuchta M, 1998. Open Pit Mine Planning ...
    ... Whittle north American strategic mine planning conference. 29. Whittle D., 2011. Open-Pit Planning and Design, SME Mining Engineering Handbook. 3rd ed. s.1.:Society for Mining, Metallurgy, and Exploration, Inc. (SME). 30. Whittle J., 1999. A decade of open pit mine planning and optimization - The ...
    ... Lovera E., & Michelottl E. , 2006. Mine Planning and Equipment Selection. s.1., The Fifth International Symposium on Mine Planning and Equipment Selection. 4. Coombes J, 2004. Resource Estimation. :Snowden Mining Industry Consultants. 5. Dagdelen K., 2001. Open Pit Optimisation - Strategies for ...

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... WOOD BIOMASS HEATING SYSTEMS IN HOUSEHOLDS Boban Pavlović1, Dejan Ivezić2, Marija Živković3 Abstract: The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% ...
    ... ac.rs Life Cycle Assessment of Individual wood Biomass Heating Systems in Households 429 Solid heating fuels consist primarily of wood and coal but can also include forestry and agricultural residues and even municipal solid waste. Most solid fuels are burned in small-scale combustion devices ...
    ... apartment buildings, etc. [3]. In Household Budget Survey 2018, published by the Statistical Office of the Republic of Serbia [5], solid fuels (wood and coal) are used in 56.6% of households for heating in Serbia. The usage of wood biomass for heating in Serbia is characterized by excessive use of firewood ...

  • Unusually sluggish microemulsion system with water, toluene and a technical branched alkyl polyethoxylate

    Marija Ilić, Franz-Hubert Haegel, Vesna Pavelkić, Snežana Zlatanović, Zoran Marković, Aleksandar Cvjetić (2015)
    Microemulsion systems with water, toluene and nonionic surfactants are interesting for application due to the excellent solvent properties of aromatic hydrocarbons. In this study, the pseudo-binary phase diagram (“fish-diagram”) of such a ternary system was investigated using a branched technical alkyl polyethoxylate. Lutensol ON 50 (i-C10E5) was considered a suitable surfactant. The system with technical branched i-C10E5 exhibits very long, and for compositions near optimum solubilization, i.e., the minimum content of surfactant needed for a bicontinuous microemulsion, extremely long ...
    микроемулзија, толуен, оксоалкохол етоксилат, термодинамичка стабилност, тернарни фазни дијаграми, дијаграми „fish“

  • Analysis of Belt Weigher Accuracy Limiting Factors

    Aleksandrović Snežana, Jović Mihajlo (2011)

  • Reliability of lines by dewatering wells

    Pavlović Vladimir, Šubaranović Tomislav, Polomčić Dušan (2013)

  • Uticaji eksploatacije i deponovanja uglja na životnu sredinu

    Lilić Nikola, Cvjetić Aleksandar (2011)

  • Comparative study of Serbian Miocene coals – insights from biomarker composition

    Stojanović Ksenija, Životić Dragana (2013)

  • Merenje mase iskopanog uglja na površinskim kopovima

    Snežana Aleksandrović (2015)

  • P-T analiza RMU Bitola – krupne klase

    Nemanja Dobrosavljević (2024)
    Cilj ovog diplomskog rada je bio ispitivanje mogućnosti i tehnologije čišćenjauglja, kao i predstaviti rezultate pliva – tone analize koja ima za cilj ocenu mogućnosti čišćenja uglja - krupnih klasa posmatranog uzorka. Da bi se ispitivanje i analiza mogućnosti čišćenja rovnog uglja u REK Bitola uspešno priveli kraju, moralo se uraditi uzorkovanje reprezentativnog uzorka iz koga se potom izdvaja prvi deo koji služi za određivanje sadržaja vlage. Pored tog dela iz uzorka se izdvaja i drugi njegov deo koji će ...
    ugalj, lignit, Bitola, PT analiza, pliva-tone analiza, čišćenje uglja, suvi ugalj, vlažan ugalj, pepeo, donja toplotna moć, čist ugalj, jalovina, bilans
    ... t/m?,. First, the forecast balance for dry coal was presented, followed by the forecast balance for wet coal. Key words: coal, lignite, Bitola, PT analysis, floating-tone analysis, coal cleaning, dry coal, wet coal, ash, lower heating value, clean coal, tailings, balance OPŠTI DEO OPSTI DEO ...
    ... The test was carried out using thc layering technology of trench coal at heavy liquid densities of 1.6 t/m* and 1.7 t/m?. Processing of P-T analysis results was performed on a "dry" coal sample (dried at 105%C) and then on a "moist" coal sample (total moisture 40.14%). After processing the results ...
    ... jalovina, bilans ABSTRACT The aim of this thesis was to show the possibilities of coal cleaning technology, as well as to present the results of the float-ton analysis, which aims to evaluate the possibility of coal cleaning - large classes of the observed sample. In order to successfully complete ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... k Pb-Zn/polymetallic ore district with sampling, locations: —— Rudnik (Pb-Zn-Cu-(Ag)) mine), 2—Rujak (Apy-Py veins), 3—Drenjak (Au mineralisation in Apy vein), 4—Sastavci (Pb-Zn mine), 5—Trepča (Pb-Zn mine), 6—Golijska reka (W-Mo-Bi mineralisation), 7—Jurija (W mineralisation). (c,d) SEM-BSE ...
    ... crystallisation temperature, and chemical composition. Arsenopyrite is often present in the ores of this district and is also commonly present in the mine tailings, and all studied samples were taken from the sulphide mineralisation in which arsenopyrite represents one of the major constituents. Among ...
    ... Germany, 1913; ISBN 9788578110796. 23. Nesbitt, H.W. Oxidation States and Speciation of Secondary Products on Pyrite and Arsenopyrite Reacted with Mine Waste Waters and Air. Mineral. Petrol. 1998, 62, 123-144. [CrossReft] Crystals 2023, 13, 278 l1of1l 24. 25. 26. 27. 28. Schaufuss, ...

  • Portion of groundwaters in the floods of western part of open pit Drmno

    Milanović Radomir, Polomčić Dušan, Zdravković Jovan, Stoićević Zoran (2015)

  • 3D Hydrogeological model of the limonite ore body “Buvač” (Republika Srpska, Bosnia and Herzegovina)

    Bajić Dragoljub, Polomčić Dušan (2008)

  • Analiza osnovnih indikatora upotrebnog kvaliteta mašina pomoćne mehanizacije na površinskim kopovima uglja

    Stevan Đenadić, Dragan Ignjatović, Predrag Jovančić, Milena Lekić, Žarko Aleksić, Ivan Janković (2022)
    Izbor optimalnog tipa mašine i adekvatno upravljanje kroz životni vek je kompleksan zadatak. Osnovna pitanja koje se postavljaju prilikom rešavanja ovog zadatka vezana su za stepen zadovoljenja rada mašine i optimalan trenutak zamene iste. U ovom radu je izvršena analiza rada dozera koji su u radu na površinskom kopu lignita RB Kolubara. Analizom je obuhvaćeno 4 različita proizvođača dozera a to su: Caterpillar, Dressta i Shantui i Liebherr. Analiza je izvršena sa aspekta ukupnih troškova koji se stvaraju i ...
    rudarstvo, mehanizacija, upotrebni kvalitet, troškovi, empirijska raspoloživost

  • Factors that influence the selection of an optimal groundwater protection system at open-pit mines

    Bajić Dragoljub, Polomčić Dušan, Močević Jelena (2015)

  • Determining the optimal groundwater control system using Fuzzy-GWCS® application

    Bajić Dragoljub, Polomčić Dušan, Dašić Tina, Ratković Jelena, Čokorilo Ilić Marina (2017)