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Упит dcterms_subject_txt:Renewable Energy

383 items

  • Rule-based Automatic Multi-word Term Extraction and Lemmatization

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac (2016)
    In this paper we present a rule-based method for multi-word term extraction that relies on extensive lexical resources in the form of electronic dictionaries and finite-state transducers for modelling various syntactic structures of multi-word terms. The same technology is used for lemmatization of extracted multi-word terms, which is unavoidable for highly inflected languages in order to pass extracted data to evaluators and subsequently to terminological e-dictionaries and databases. The approach is illustrated on a corpus of Serbian texts from ...
    term extraction, terminology, multi-word units, lemmatization, finite-state transducers
    ... in the plural, although singular forms exist for simple word constituents. The first case occurs with the MWT električna.f energija.f ‘electric energy’ whose simple word lemma is *električni.m energija.f. The second case occurs with the MWT minerski.p radovi.p ‘blasting works’ whose simple word ...
    ... to e-dictionary production will be illustrated with another example of MWT extracted from our evaluation corpus – električna energija ‘electric energy’. The graph that retrieves syntactic constructions AXN (grf01) extracted four different forms – three of them definitely singular and one that ...
    ... by Freq (1660). A similar example is vibracija šake ‘hand vibration’ and MWUs that contain it. On the other hand, električna energija ‘electrical energy’ is more frequently mentioned in SrpKor (a lot of news articles), and thus in terms of domain specificity it is being pushed to the bottom of ...

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics

  • Споменица 1991. – 2015. година: 135 година геологије и 70 година рударства на Универзитету у Београду

    главни и одговорни уредник Душан Поломчић (2016)
    Рударско-геолошки факултет
    ... natural gas. Proceedings of 5th International Scientific Conference on Energy and Climate Change, 192–199, Atina, Grčka. IVEZIĆ D., ĐAJIĆ N., ŽIVKOVIĆ M., 2013: Potential and Barriers to Renewable Energy Sources in Serbia. Energy Sources, Part B: Economics, Planning, and Policy, Vol. 8, No. 2, pp. ...
    ... Possibilities of Development of New and Renewable Sources of Energy in Yugoslavia. ICEMENERG, knjiga 2/401, str. 173–180, Neptun (Rumunija). ĐAJIĆ N., 2007: Natural Gas – A Chance for Sustainable Development of Serbian Energy Sector. XX Congress World Energy Council, Rome. D. IVEZIĆ, M. ŽIVKOVIĆ ...
    ... N., ŽIVKOVIĆ M., 2013: Potential and Barriers to Renewable Energy Sources in Serbia. Energy Sources, Part B: Economics, Planning, and Policy, Vol. 8, No. 2, pp. 162–170. GRUJIĆ M., IVEZIĆ D., ŽIVKOVIĆ M., 2014: Application of multi-criteria decision- making model for choice of the optimal solution ...

  • Split-Desktop software for the analysis of fragment size distribution of blasted rock mass

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)
    Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...
    Split-Desktop softver, drobljenje stena, miniranje, analiza, digitalna obrada fotografija

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... M 'l Fe 7: ca K ·•š V J cCr Š' |-- i 4 | : I_ E = i ca 5 ež | S : 1032 1062 Fe N Ni 0 0 5000 10000 o 250 500 750 1000 1250 Energy / eV Wavenumber / cm” Figure 6. Representative EDS (left) and Raman (right) spectra recorded on spots 0 and 4 of sample b (see Figure 1). The ...
    ... ) are obvious. Si Mg [0] 1598 ca /| Fe / >|\V ž => ŠA 5 E E e c ČI i _ [ P r K) J Cr Ni 3 0 5000 10000 Q0 1000 2000 Energy / eV Wavenumber / cm' Figure 7. Representative EDS (left) and Raman (right) spectra recorded on some spots of sample c (see Figure 1). Materials ...
    ... AISi MO|| c a) 0 7| \ Fe W \ Cu 8 > > S Ti š - a E ? E E o 6 i E N| W & ga Fe | p 1 0 5000 10000 O - 500 000 41500 2000 Energy / eV Wavenumber /cm" Figure A3. Representative EDS (left) and Raman (right) spectra recorded on some spots of sample a (see Figure 1). Materials ...

  • 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
    ... ry and minera­ logy of Greek lignites from Ioannina basin.– Energy Sources, 19, 111–128. doi: 10.1080/00908319708908837 GEORGAKOPOULOS, A. (2001): Trace elements in the lava xylite/lignite deposit, Servia basin, Northern Greece.– Energy Sources, 23, 143–156. doi: 10.1080/ 00908310151092335 GLUSKOTER ...
    ... affinities and their behavior during peat combustion.– Energy Fuel, 16, 1476–1482. doi: 10.1021/ef0200673 KARAYIGIT, A.I. & GAYER, R.A. (2000): Trace elements in a Pliocene–Pleistocene lignite profile from the Afşin–Elbistan field, Eastern Turkey.– Energy Sources, 22/1, 13–21. KARAYIGIT, A.I., GAYER, R ...
    ... Journal of the Croatian Geological Survey and the Croatian Geological Society 1. INTRODUCTION Lignites of Upper Miocene age are the most important energy source in Serbia. Almost all lignite production (90%) from the Kolubara and Kostolac basins is used in thermal power plants (TPP), (EPS, 2018). ...

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... Received: May 29, 2015 Accepted: June 15, 2015 Abstract: During blasting operations, the potential energy of explosive materials is transformed into a mechanical work. That energy, in the vicinity of blasting location, destructs and crushes rock mass, a bit further creates cracks and permanent ...

  • Structural characterization of traditional pottery produced from local clay, Rujište (Ražanj, Central Serbia), in an effort to preserve its geoheritage

    Maja Milošević, Biljana Đorđević, Alena Zdravković (2021)
    ... conducted with a scanning electron microscope (SEM) equipped with a detector for secondary electrons (SE), back-scattered electrons (BSE), modern energy-dispersive spectrometer (EDS), a wavelength-dispersive spectrometer (WDS) and a cathodoluminescence detector (CL) were applied to determine the ...

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... 55 queries were obtained, as illustrated in Fig. 6 for the query “geothermal energy in spas”. It should be noted that results in this section are presented and Fig. 6. Precision-recall curve for the query “geothermal energy in spas”. A u t h o r P r o o f Improving Document Retrieval in Large ...
    ... forthcoming years [23]. As a result of this analysis, the then Ministry of Natural Resources and Environment Protection (now Ministry of Mining and Energy of the Republic of Serbia), launched in 2004 the project of the Geological Information System of Serbia (GeolISS ), which has been developed in several ...
    ... ugljevi of ugalj ‘coal’ that is specific to the mining terminology. The graph presented in Fig. 12 gives average precisions for one query (“geothermal energy in spas”). The comparison of current system and new indexing methods shows that the InQuery method is superior for majority of queries over current ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... 175. 4. Mohamadibadi, H.S.; Tichkowsky, G.; Kumar, A. Development of a Multi-Criteria Assessment Model for Ranking of Renewable and Non-Renewable Transportation Fuel Vehicles. Energy 2009, 34, 112–125. [CrossRef] 5. Govindan, K.; Jepsen, M.B. ELECTRE: A compehensive literature review on methodologies ...
    ... Ivan Jankovic 1, Stevan Djenadic 2, Dragan Ignjatovic 2, Predrag Jovancic 2, Tomislav Subaranovic 2 and Ivica Ristovic 2,* 1 Ministry of Mining and Energy, 11000 Belgrade, Serbia; ivan.jankovic@mre.gov.rs 2 Faculty of Mining and Geology, University of Belgrade, 11000 Belgrade, Serbia; stevan.djenadic@rgf ...
    ... Jankovic 1, Stevan Djenadic 7, Dragan Ignjatovic *, Predrag Jovancic 2, Tomislav Subaranovic 2 and Ivica Ristovic *’* 1 2 Ministry of Mining and Energy, 11000 Belgrade, Serbia; ivan.jankovic@mre.gov.rs Faculty of Mining and Geology, University of Belgrade, 11000 Belgrade, Serbia; stevan.djenadic@rgf ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • 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

  • Callovian (Middle Jurassic) Sphriganaria (Brachiopoda) from the Jordan Valley (Middle East)

    Howard R. Feldman, Barbara V. Radulović, Fayez Ahmad (2023)
    Brachiopods, Middle Jurassic, Sphriganaria, shell microstructure, Ethiopian Province

  • Development of an integrated model for open-pit-mine discontinuous haulage system optimization

    Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović (2024)
    equipment selection, mine mechanization, expert judgment, linguistic variables, MCDM, FAHP

  • Одређивање оптималних параметара цевовода за двофазни проток

    Николина Ћурчић (2024)
    Eфикасно управљање протоком флуида је кључно за оптимизацију перформанси система и обезбеђивање оперативне сигурности. Двофазни ток, који подразумева истовремено присуство течне и гасне фазе унутар цевовода и измењивача топлоте, представља један од најсложенијих аспеката динамике флуида. Овај феномен намеће јединствене изазове који захтевају дубоко разумевање и прецизно планирање. Ефикасно управљање двофазним током није само кључно за одржавање ефикасности система, већ је и неопходно за спречавање потенцијалних проблема као што су повећана ерозија, неочекиване флуктуације притиска и ризици по безбедност. У ...
    евовод, оптимизација, двофазни проток, параметри цевовода, трошкови
    ... i CompilanceSigns. (n.d.). Pipelines: The Lifeline and Liability of Qur Energy Infrastructure. Retrieved from CompilanceSigns: https://www.compliancesigns.com/blog/pipelines-the-lifeline-and-liability-of- our-energy-infrastructure/ Enbridge. (2018, May 30). Why are pipelines the best, safest ...
    ... n and Production Technology 12, 3033—3057. Canada, E. C. (2023, August 9). Pipeline 101 — Four Diffjerent Types of Pipelines. Retrieved from Energy Connections Canada: https://energyconnectionscanada.com/pipeline-101-four-different-types-of- pipelines/ Cevovodi. (2020, June 13). Retrieved ...
    ... to transport oil and gas? Retrieved from Enbridge : https://www.enbridge.com/Your-questions/User- submitted/Why-are-pipelines-safest-way-to-move-energy-products.aspx Engineering, C. (n.d.). 7wo-Phase Flow in Pipelines and Heat Exchangers: A Comprehensive Guide. Retrieved from Converge Engineering ...

  • 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
    ... represents the pumping pressure, which is an indicator of the increase in potential energy of the fluid. The efficiency of the pump depends on its ability to convert mechanical energy into the potential energy of the fluid. Free gas in the fluid can negatively affect the pump's efficiency, especially ...
    ... includes: a) Downhole pump b) Gas anchor c) Tubing anchor d) Sucker rods e) Tubing The downhole pump converts mechanical work into potential energy by increasing the fluid pressure. The pressure of the fluid entering the pump is called the suction pressure, while the pressure at the pump's ...
    ... pump 2.3 Importance of efficient pump operation Frequent changes in pump operation and fluid composition lead to variations in the load and energy consumption of the system. Based on the physical characteristics of the well and measured values of load and smooth rod stroke, theoretical and surface ...

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • 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
    ... Jovanovski, Natasha Nedelkovska — O a 285 Enepruja, Đocu.inu ropuBa u Jar:tepojiHa HeyTpaJIHocT CEEGS PROJECT – A NEW PERSPECTIVE FOR GREEN ENERGY Jris Puković Kartal O a 293 CHCTEM 3A VIIPABVBAĐE CO KBAJIHTETOT HA JATJIEHMTE BO ITE PVJIHHILIH-PEK BHTOJIA Mapuja Manesa, Eanusaa6ema Mumpesecka ...
    ... Kynantoro Y., Alawiyah S., 2016: Second vertical derivative using 3-D gravity data for fault structure interpretation. International Conference on Energy Sciences (ICES 2016), 25—27 July 2016, Bandung, Indonesia, IOP Conference Series: Journal of Physics: Conference Series 877: 012039. ...

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... Al K, source at 1.486 keV, 50 W, 15 kV and with a 200 m spot. For the survey spectra, a pass energy of 187.5 eV was set with a step width of0.8 eV and 100 ms/step. For the detailed spectra, the pass energy was 23.5 eV, the step width 0.1 eV with 100 ms/step. A Shirley background was used for baseline ...
    ... Smith MW, Shekhawat D. Effect of microwave and thermal co-pyrolysis of low-rank coal and pine wood on product distributions and char structure. Energy Fuels. 2019; 33: 7069—7082. https://doi.org/10.1021/acs.energyfuels.9b01105. Ndukwu MC, Horsfall IT, Ubouh EA, Orji FN, Ekop IE, Ezejiofor NR. ...
    ... Hu XJ, et al. Biochar as potential sustainable precursors for activated carbon production: Multiple applications in environmental protection and energy storage. PLOS ONE | hitps://doi.org/10.1371/journal.pone.0277365 November 17, 2022 33/38 PLOS ONE Surface functional groups and degree of ca ...