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Упит dcterms_creator_txt:Rolf L. Romer

723 items

  • Navigacija budućnosti: poslovni rizici i prilike u rudarskoj industriji

    Petar Marković, Dejan Stevanović, Mirjana Banković, Vuk Lazić (2024)
    Sektor rudarstva i metalurgije se globalno suočava sa brzo evoluirajućim okruženjem u 2024. godini, koje karakteriše jedinstvena međusobna zavisnost rizika i prilika. Sektor je u središtu globalne energetske tranzicije, uz rastuću potražnju za kritičnim mineralnim sirovinama poput litijuma, nikla i bakra, koji su od suštinskog značaja za tehnologije obnovljive energije i električna vozila. Međutim, ova sve veća odgovornost donosi brojne izazove, uključujući pojačanu pažnju na ekološke, društvene i upravljačke (ESG) faktore, fizičke i tranzicione rizike uzrokovane klimatskim promenama, i ...

  • Tehno – ekonomska ocena ležišta bakra i zlata u istočnoj Srbiji

    Strahinja Sarajlić (2024)
    U svrhu postizanja optimalnih rezultata pri eksploataciji ovog ležišta bakra i zlata, koje se nalazi u istočnom delu Srbije, biće primenjena metoda podetažnog zarušavanja rude i okolnih stena.Tehno-ekonomska ocena opravdanosti eksploatacije rude bakra iz ovog ležišta, urađena je na bazi projektovanih parametara datih u tehničkom projektu. Urađena je analiza i ocenjena je rentabilnost ovog projekta na bazi predviđenog veka eksploatacije od 19 godina.Procenjeno je da je investicioni projekat u celini rentabilan i ekonomski potpuno opravdan. opravdan.
    tehno – ekonomska ocena, investicioni projekat, otvaranje rudnika, metoda otkopavanja, ekonomska ocena, kapitalna investicija
    ... prolazi kroz miocenske sedimente, koji su zbog svojih geomehaničkih karakteristika nepovoljni za izgradnju rudarskih prostorija. 17 Trasa niskab··l sa severne strane Trasa niskopa sa južne strane Ć cGl GsooQIC Slika 4 – Položaj u planu razmatranih trasa niskopa u odnosu na površinu terena ...
    ... 47 1.072,33 342.631.286 KBBERGGORE 319.520,47 1.072,33 342.631.286 319.520,47 1.072,33 342.631.286 KBE BEBE 319.520,47 1.072,33 342.631.286 | o l| 319.520,47 1.072,33 342.631.286 319.520,47 1.072,33 342.631.286 319.520,47 1.072,33 342.631.286 319.520,47 1.072,33 342.631.286 319.520,47 1.072 ...
    ... 098 USD), odnosno ukupno 3.020.548.779 USD. Dinamika neto ekonomskog toka i njegovog kumulativa prikazana je na slici 19. 1.500.000.000 •.l·l]l]]lllll 1 # KUMUL e _ b o o NETO u a v o 27 > "» d > j e . . . – ~ e EK.TOKA Š 500.000.000 1.000.000.000 Slika 19 – Dinamika neto ekonomskog ...

  • Синтеза, структурне и магнетне особине Ca1-xGdxMnO3 нанопрахова

    Milena Rosić (2014-12-05)
    У оквиру ове докторске тезе, испитиване су оптималне методе за добијањенанопраха – калцијум манганског оксида допираног јонима гадолинијума. Циљистраживања је испитивање одговарајућих прекурсора који су подесни да седобију чисти нано прахови манганита са перовскитском структуром, као имонофазни чврсти раствори са перовскитском структуром. Као подесан методкоришћена је модификована глицин нитратна метода, а од прекурсора нитрати иацетати одговарајућих метала. Модификација глицин нитратне методе се односина делимичну замену нитрата ацетатима, чиме је ублажена бурност реакције.Испитан је различити однос прекурсора, који дају наночестичне ...
    Наноструктурни материјали, Оксиди, Термална анализа,Рендгенструктурна анализа, Магнетна мерења.
    ... (2004): Nonstoichiometry and reducive decomposition of CaMnO3-δ. Solid State Ionics 176, 217-223. Birol, T., Benedek, N. A., Das, H., Wysocki, A. L., Mulder, A. T., Abbett, B. M., Smith, E. H., Ghosh, S., Fennie, C. J. (2012): The magnetoelectric effect in transition metal oxides: Insights and ...
    ... and the rational design of new materials from first principles. Current Opinion in Solid State and Materials Science Vol. 16, No. 5, 227–242 Bocher L., Aguirre M. H., Robert R., Logvinovich D., Bakardjieva S., Hejtmanek J., Weidenkaff A. (2009): High-temperature stability, structure and thermoelectric ...
    ... Милена Росић 115 Coey, J.M.D., Viret, M., Von Molnar, S. (1999): Mixed-valence manganites. Advances in Physics, Vol. 48, No. 2, 167-293. Cong, L., He, T., Ji, Y., Guan, P., Huang, Y., Su, W. (2003): Synthesis and characterization of IT-electrolyte with perovskite structure La0.8Sr0.2Ga0.85Mg0 ...

  • Optimising in electrical energy consumption in mining plants

    Snežana Aleksandrović, Vesna Damnjanović, Ilija Jeftenić (2018)

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... 35       min 0 1,2,..., subject to : 0 1,2,..., i j L U f x g x i r h x j m x x x         (1) In this formulation x is the n-dimensional vector of SBP and UMCP coordinates ...

  • Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study

    Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović (2019)
    Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...
    tecišta, modeliranje, RAMMS, DEM
    ... den Arelen avalanche with RAMMS: Interpretation of model results. Annals of Glaciology 51(54): 161-168. Christen M, Bartelt P, Kowalski J, Stoffel L (2007) Calculation of dense snow avalanches in three-dimensional terrain with the numerical simulation program RAMMS. Differential Equations.vol ...

  • 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 ...

  • Energetska efikasnost elektromotora na površinskim kopovima

    Snežana Aleksandrović, Ilija Jeftenić (2023)

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Projecting short to medium-term effects of carbon emissions trading on Serbia's GDP

    Boban Pavlović, Nikola Trtica (2024)
    This paper presents an approach to assess the short to medium-term effects of the Emissions Trading System (ETS), an economic and climate policy instrument aimed at reducing greenhouse gas emissions, on GDP from the expenditure side. The analysis focuses on Serbia’s electricity sector, which relies heavily on lignite-based pro duction dominated by state-owned enterprises. The obtained projections suggest that in the short term, the introduction of an ETS may lead to slower GDP growth compared to official forecasts. However, ...
    ETS, BDP - rashodni pristup, cene električne energije
    ... implement proactive policies using the revenue from the ETS to mitigate its impact on GDP reduction, a three-year lag effect is introduced: AGL=L x (1+r)" (4) Where: AGI, is the change in government investments in year t, Ten is the real (inflation-adjusted) income invested from the ETS n ...
    ... climate injustice: A study on economic distributional impacts. Energy 296, 131074. https://doi.org/10.1016/ j.energy.2024.131074. Dynan, K., Sheiner, L., 2018. GDP as a measure of economic well-being, hutchins center on fiscal & monetary policy at brookings. https://www.brookings.edu/wp-content/ up ...
    ... Macroeconomic effects of carbon taxes. In: Parry, LW.H. (Ed.), Implementing a US Carbon Tax. Routledge. https://doi.org/10.5089/ 9781138825369.071. Wu, L., Gong, Z., 2021. Can national carbon emission trađing policy effectively recover GDP losses? A new linear programming-based three-step estimation approach ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... effects of coal mining and combustion on environmental quality. Risk is a function of risk event probability (P) and the measure of loss (L) it inflicts: R = f(P, L) (1) Energies 2016, 9, 1071 6 of 20 Actualization of a risk event in a mining and energy complex leads to heavier or smaller economic ...
    ... equated with the latest time for event occurrence [8]: (TL)n = (TE)n (3) The latest time for event occurrence (TL) is represented by the formula: (P L)i = min j∈yi {(TL)i− tij} (4) where yi denotes the set of events that can be directly crossed into from the event and only through one activity (i, j) ...
    ... Streimikiene, D.; Sivickas, G. The EU sustainable energy policy indicators framework. Environ. Int. 2008, 34, 1227–1240. [CrossRef] [PubMed] 21. Wang, L.; Xu, L.Y.H.; Song, M. Environmental performance evaluation of Beijing’s energy use planning. Energy Policy 2011, 39, 3483–3495. [CrossRef] 22. Bowden ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... central part of seam II in field B. Pyrite is one of the most abundant sulphide minerals and a typical authigenic mineral in the Kovin lignite (Fig. 4k, l, m). Syn­ genetic pyrite occurs as framboidal and euhedral crystals (CHOU, 2012), situated along stratified bands or infilling cavities within the organic ...
    ... Mo in seam II and Sr in seam III, im­ ply a close connection with pyrite. The result of SEM­EDS exa­ mination confirms the correlation data (Fig. 4k, l, m). The mi­ neral­rich lignite in the bottom part of seam I of field B is particularly enriched in As (Fig. 4). A very strong correlation between Fe ...
    ... chemical and mineralogical investigation of the Kovin lignite samples indicate a pyritic form of As, Cd, Co, Cr, Mo, Se in seam I (Table 8; Fig. 4k, l, m) formed in pre­ sumably neutral and anaerobic conditions in the palaeomire. The very strong correlation of Fe with As (r=0.94), Cd (r=0.97), Co (r=0 ...

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... Building Calendar (Građevinski calendar in Serbian), Vol. 49, Union of Engineers and Technicans of Serbia, 196-231. Rakic, D., Basaric, I., Caki, L. and Coric, S. (2018).Contribution to the geotechnical classification of municipal waste landfills in Serbia, Environmental Geotechnic, icepublishing ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... mapping inside the investigative galleries at dam site. Minutes of the Serbian Geological Society. LJ., Milanović S., Puskas-Preszner A., Palscu L., 2020: Determination of the groundwater-leakage . mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... Processing of Serbian – Automata, Texts and Electronic dictionaries. Faculty of Philology, University of Belgrade. Noraset, T., Liang, C., Birnbaum, L., & Downey, D. (2017). Definition modeling: Learning to define word embeddings in natural language. In Proceedings of the AAAI Conference on Artificial ...

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... special marks. For instance, a digit ‘0’ and a letter ‘О’; a letter ‘И’ can be recognized as 11 (but not vice versa) or a letter ‘љ’ can be recognized as ‘л>’ (but not vice versa). Our solution addresses only falsely recognized words that result in non- valid words. It follows four steps: 1. The text obtained ...
    ... Sébastien, Sebastian Nagel Marschner and Johannes Stiehler. “UNITEX 3.1 User Manual”. Université Paris-Est Marne-la-Vallée. (2016) Peterson, James L. “Computer Programs for Detecting and Correcting Spelling Errors”. Commun. ACM Vol. 23, no. 12 (1980): 676–687. http: //doi.acm.org/10.1145/359038.359041 ...

  • Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking

    Ranka Stanković, Milica Ikonić Nešić, Olja Perisic, Mihailo Škorić, Olivera Kitanović (2024)
    U radu se prikazuju rezultati istraživanja vezanih za pripremu paralelnih korpusa, fokusirajući se na transformaciju u RDF grafove koristeći NLP Interchange Format (NIF) za lingvističku anotaciju. Pružamo pregled paralelnog korpusa koji je korišćen u ovom studijskom slučaju, kao i proces označavanja delova govora, lematizacije i prepoznavanja imenovanih entiteta (NER). Zatim opisujemo povezivanje imenovanih entiteta (NEL), konverziju podataka u RDF, i uključivanje NIF anotacija. Proizvedene NIF datoteke su evaluirane kroz istraživanje triplestore-a korišćenjem SPARQL upita. Na kraju, razmatra se povezivanje Linked ...
    paralelni korpusi, povezivanje imenovanih entiteta, prepoznavanje imenovanih entiteta, NER, NEL, povezani podaci, NIF, Vikipodaci

  • Dimenzionisanje deponija za ugalj

    Dinko Knežević, Božo Kolonja, Ranka Stanković, Aleksandra Tomašević, Dragana Nišić (2014)
    ... druga (obično na lokaciji potrošača) koristi samo kao rezerva. -100 -50 0 50 100 150 Ja nu ar Feb ru ar M ar t A pr il M aj Ju n Ju l A vg ust S ep te m ba r O kt oba r N ove m ba r D ece m ba r mesec od no s pr oi zv od nj e i p ot ro šn je u gl ja , h ilj ...

  • Developing Students’ Mining and Geology Vocabulary Through Flashcards and L1 in the CLIL Classroom

    Lidija Beko, Ivan Obradović, Ranka Stanković (2015)
    ... engineering literature. 9. REFERENCES Auerbach, Elsa Roberts. 1993. Reexaming English only in the ESL classroom. TESOL Quarterly 27: 9– 32. Beko, L. 2013. Content and Language Integrated Learning (CLIL) in Earth Science. PhD diss., University of Belgrade. Crick, Francis. 1979. Thinking about the ...

  • Terminological and lexical resources used to provide open multilingual educational resources

    Biljana Lazić, Danica Seničić, Aleksandra Tomašević, Bojan Zlatić (2016)
    Open educational resources (OER) within BAEKTEL (Blending Academic and Entrepreneurial Knowledge in Technology enhanced learning) network will be available in different languages, mostly in the languages of Western Balkans, Russian and English. University of Belgrade (UB) hosts a central repository based on: BAEKTEL Metadata Portal (BMP), terminological web application for management, browse and search of terminological resources, web services for linguistic support (query expansion, information retrieval, OER indexing, etc.), annotation of selected resources and OER repository on local edX ...
    otvoreni obrazovni resursi, leksički resursi, obrada prirodnih jezika, terminologija
    ... Gruninger, “Ontologies: Principles, methods and applications,” Knowledge engineering review, vol. 11, No. 2, pp. 93–136, June. 1996. [12] P. Pantel and L. Dekang, “A statistical corpus-based term extractor,” in Advances in Artificial Intelligence, 1st ed., E. Stroulia and S. Matwin, Ed. Springer Berlin ...