Претрага
269 items
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Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions
Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák. "Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions" in Journal of Solid State Chemistry, Elsevier BV (2015). https://doi.org/10.1016/j.jssc.2015.06.027
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Integrative GHG Assessment in Oil and Gas Industry
Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...... various activitics involved in production and processing. It considers the company's cfforts toward reducing flaring: by employing the gas processing unit to utilize the gas that would otherwise bc flared. Therefore, it provides a comprehensivc representation of thc typical activities and emissions ...
... yecar for each facility Results of emissions overvicw per source typc arc presented in Figures 4-7. All values are presented per year and facility in unit tonnes CO»e. 79868,3 60852,0 2020 2021 u Flowstation 2022 mGas plant Figure 4. Flare gas CO»e 2020 u Flowstation 2021 2022 mGas ...Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa. "Integrative GHG Assessment in Oil and Gas Industry" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.51M
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Дигиталне библиотеке у рударству и геологији са посебним освртом на представљање сиве литературе
Имајући у виду потребу за проналажењем информација похрањених у различитим облицима документације која се генерише у областима рударства и геологије на Рударско-геолошком факултету Универзитета у Београду, отпочет је процес развоја дигиталне библиотеке ROmeka@RGF, на платформи за приказивање дигиталних колекција - Омека. Значајан део документације представља такозвана сива литература која је претежно заступљена у виду вишетомне документацијe. Први савладани изазов представљало је повезивање различитих вишетомних делова пројектних извештаја у једну целину која би била лако доступна и претражива.... due to information lose in long-time period and unstable environment. The first challenge is to connect different multivolume parts in one consistent unit that is easily accessible and searchable. One more challenge is the nature of the project documentation which is the mixture of textual, numerical ...Биљана Лазић, Александра Томашевић, Михаило Шкорић. "Дигиталне библиотеке у рударству и геологији са посебним освртом на представљање сиве литературе" in Научна конференција Библиоинфо — 55 година од покретања наставе библиотекарства на високошколском нивоу, Београд 18. мај 2017., Филолошки факултет Универзитета у Београду (2019). https://doi.org/10.18485/biblioinfo.2017.ch13
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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... available heat source. Besides selection of the appropriate heat pump technology, the heat source has influence on the placement of the heat pump unit, connection and operational modes, appropriate thermal capacity and range of operational temperatures for the system (Sayegh et al. 2018). These ...
... energy supply, and environmental impact. Energy performance The primary energy factor (fp) determines the primary energy required to supply one unit of useful energy to the consumer. The primary energy factor is calculated by using the methodology given in the European Standard EN 15316- 4-5 (Standard ...
... Ei + Qext Environmental impact Carbon dioxide emission coefficient (Kp,dh) determines the amount of emitted carbon dioxide per useful (delivered) unit of heat energy. It is calculated as follows: E i MWh Energy content of the ith energy carrier input to heat producer, Kpi [ kg MWh ] Primary ...Marija Živković, Dejan Ivezić. "Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability" in Clean Technologies and Environmental Policy, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10098-021-02063-6
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Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species
Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić. "Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species" in Nanotechnology, IOP Publishing (2019). https://doi.org/10.1088/1361-6528/ab3ca2
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Određivanje broja kamiona za transport jalovine na površinskom kopu „Šuplja Stijena“
Siniša Bujišić (2024)U radu će se govoriti o praktičnoj primeni programskog paketa Talpac za određivanje broja kamiona za transport jalovine na površinskom kopu „Šuplja Stijena“, kao i o ulozi i značaju ovog programa u savremenom rudarstvu. Na osnovu ulaznih podataka i informacija vezanih za Šuplju Stijenu, uz pomoć programskog paketa Talpac izvršeno je projektovanje transportnih trasa. Transportne trase projektovane su tako da obezbede siguran rad ljudstva i opreme, a optimizovane su po pitanju transportnih dužina i organizacije proizvodnje. Kako bi se ...... Edit Loading Unit Template: KOMATSU PC 800-8RN x Operational Data Costing Data · Distribution Data Actions and Global Options { Change Loader... Project Options... \ , Bucket Selection... 7} Identification Loading Unit Template Name IKOMATSU PC 800 Database Loading Unit _ (Std DB) |KOMATSU ...
... |KOMATSU PC 800-BR| Loader Class: Shovel (hydraulic) Loading Unit Operation Database Bucket Capacity | 4.50|cu.metres Mvailable Bucket Capacity 3.60 (Fill Factor Applied) - Actual Bucket Capacity | 3.60|cu.metres equiv.to| 8.22|tonne cu metres equiv.to| 8.22|tonne Adjust bucket capacity to ...Siniša Bujišić . Određivanje broja kamiona za transport jalovine na površinskom kopu „Šuplja Stijena“, 2024
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INVENTS: A Hybrid Mine Ventilation Planning and Design System
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 ...... itself. These requirements can be met successfully through the modified object-oriented approach proposed in this paper with the object as the modular unit of the system. Objects consist of attributes (structures representing their internal data), methods (procedural components), and rules (declarative ...Lilić Nikola, Stanković Ranka, Obradović Ivan. "INVENTS: A Hybrid Mine Ventilation Planning and Design System" in Proceedings of International Scientific Conference of FME Session 4: Automation Control and Applied Informatics , Hong Kong : iConcept Press (2013)
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INVENTS: a hybrid system for subsurface ventilation analysis
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 ...... itself. These requirements can be met successfully through the modified object-oriented approach proposed in this paper with the object as the modular unit of the system. Objects consist of attributes (structures representing their internal data), methods (procedural components), and rules (declarative ...Nikola Lilić, Ranka Stanković, Ivan Obradović. "INVENTS: a hybrid system for subsurface ventilation analysis" in Proc. of International Scientific Conference of FME, September 2000, Ostrava, FME (2000)
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Why classical sequence stratigraphy doesn't work in Pannonian basin?
Dejan Radivojević (2018)... t with exception in southeastern end in vicinity of Carpathians where its thickness is higher (figure 1). Seismic reflections within this unit are mostly parallel and continuous and represented with deep‐water sediments. Second sequence (P2) differ from overlying units because of its inte ...Dejan Radivojević. "Why classical sequence stratigraphy doesn't work in Pannonian basin?" in 17th Serbian Geological Congress, Vrnjačka Banja, 17-20 maj 2018, Srpsko geološko društvo (2018)
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Одређивање оптималне производње дубинске пумпе на клипним шипкама
Небојша Савић (2024)Дужи временски период током историје производње нафте, дубинске пумпе на клипним шипкама су први и у многим случајевима једини избор када су у питању механичке методе експлоатације. Правилан одабир сваког појединачног елемента система омогућава оптимизацију која са собом повлачи бенефите у виду повећавања ефикасности и смањења трошкова. Тренутно примењени систем дубинских пумпи на клипним шипкама на лежишту „Н“ обезбеђује стабилну производњу и реализацију годишњих планова производње без већих проблема. У овом раду је приказан начин оптимизације производње дубинским пумпама ...... „iInput data“ — VnasaHu mojanu npopauyHa KomaMuHHa (pnyuM/j(iA, KapaKTepHcTHKeC (pnyuna, nparHcru Ha TyOHHTy, Ke3HHTy, JUHHaMHUKH HHBO. „Pumping unit“ — OnByje je Ha3HaueHO KOJH THII KauaJbKe Je OJLaOpaH 3a rmpopauyH, JNyxxauHa xoja onaOpanHa 3a ripopauyH H CTpyKTypHa HeypaBHOTe)KCHOCT. 36 ...
... Sinake/double cyl. enoine: 15 HP Mulbcyunder Engine: 15 HP Pumping Unit:UP90 Torque analysis and electricity BALANCED API Size:C-310-202-118 (Unit ID CUSTOM) OMAaTor) ~ · u OMNAG dirtka lataih o r al lhescdLiara -=:aOaia -10 b afbox loa/ j 'Crank rotatvon with well to nqbt: CCW Cyolic loed ...
... le cyl. engine: 8HP 8HP Multcylnder Engine 10HP 8HP Pumping Unit:UP90 Torque analysis and electncity BALANCED BALANCED API Size:C-310-200-118 (Unit ID CUSTOM) o GR ED0J) “OMR TNIJ Os Weleieab(enı Poak dev 398 2000 : arbox j: .. Crank rotation with veell to nqht: CCW Cvoho ioad factor: 1669 155 ...Небојша Савић. Одређивање оптималне производње дубинске пумпе на клипним шипкама, 2024
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Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes
... set of world development indicators, which include: • real GDP per unit of energy consumption; • net energy imports as a percentage of commercial energy consumption; and • total carbon dioxide emissions per capita and per real GDP unit [7]. The principles of sustainable development represent a starting ...
... reducing energy losses 1 18–22 26 Analyzing the annual level of coal exploitation 3 6–19 27 Data analyzing on GDP per unit of consumption and total emissions of carbon dioxide per GDP unit 1 19–22 28 Analyzing and evaluating harmful consequences of coal exploitation and coal combustion 1 20–23 29 Creating ...Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović . "Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes" in Energies (2016). https://doi.org/https://doi.org/10.3390/en9121071
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Development Of The Serbian Geological Resources Portal
... geological vector map of Serbia 1:100.000. http://geoliss.ekoplan.gov.rs/OGK/OGKVektorWEB. Figure 1 presents one detail of the vector map for sheet Ivanjica.7 Several maps were prepared with ArcGIS Server 9.3.1 and web services were published, compliant with the Open Geospatial Consortium’s (OGC) Web ...
... of the web portal The part of the web portal pertaining to geoheritage and geodiversity of North-Western Serbia represents the Adriatic geotectonic unit through different cycles of geological history, in the time span between 390 and 65 million years. This part of the portal was Development of the Serbian ...Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić. "Development Of The Serbian Geological Resources Portal" in Proceedings of the 17th Meeting of the Association of European Geological Societies, Belgrade, Serbia : The Serbian Geological Society (2011)
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An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)
N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero. "An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)" in Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier BV (2020). https://doi.org/10.1016/j.palaeo.2020.110145
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Primena ubrzane konsolidacije kod izgradnje nasipa na deonici priključka Novi Beograd – Surčin autoputa ,,Miloš Veliki"
Aleksa Tomičić (2024)Problem koji se javlja prilikom izgradnje objekata na ne konsolidovanom stišljivom tlu jeste pre svega vezan za prevelika sleganja tla usled opterećenja od objekata, najčešće su to objekti putne infrastrukture (nasipi), ili stambeno poslovni objekti. U tu svrhu se,primenjuju različiti vidovi ubrzanja konsolidacije tla. Stoga za potrebe izrade završnog rada Master akademskih studija studijskog programa geotehnika, na Rudarsko-geološkom fakultetu, izvršena je analiza dva najčešće korišćena postupka ubrzanja konsolidacije: predopterećenjem i ugradnjom peščanih drenova. Glavni cilj ovih postupaka je ...Aleksa Tomičić . Primena ubrzane konsolidacije kod izgradnje nasipa na deonici priključka Novi Beograd – Surčin autoputa ,,Miloš Veliki", 2024
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An Italian-Serbian Sentence Aligned Parallel Literary Corpus
This article presents the construction and relevance of an Italian-Serbian sentence-aligned parallel corpus, delving into the aligned sentences in order to facilitate effective translation between the two languages. The parallel corpus serves as a valuable resource for language experts, researchers, and language enthusiasts, fostering a deeper understanding of linguistic nuances and cultural expressions. By bridging the gap between Serbian and Italian, this corpus opens new avenues for cross-cultural communication and collaboration, and ultimately contributes to the improvement of language-related ...Saša Moderc, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić. "An Italian-Serbian Sentence Aligned Parallel Literary Corpus" in Review of the National Center for Digitization, Belgrade : Faculty of Mathematics, University of Belgrade (2023). https://doi.org/10.5281/zenodo.11203388
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Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking
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, VikipodaciRanka Stanković, Milica Ikonić Nešić, Olja Perisic, Mihailo Škorić, Olivera Kitanović. "Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking" in Proceedings of the 9th Workshop on Linked Data in Linguistics @ LREC-COLING 2024, Turin, 20-25 May 2024, ELRA and ICCL (2024)
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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... pumps. Figure 2.1 illustrates a deep well pumping system that includes both surface and subsurface equipment. This system consists of the driving unit (horsehead), a string of sucker rods, and the downhole pump. Walking Beam Equalizer Bearing ii i Countenweight — | Casig Stings = '{I Figure ...
... well pumping 2.1.1 Surface equipment for deep well pumping includes the following elements: a) Wellhead equipment b) Smooth Rod c) Driving Unit The smooth rod is located at the top of the sucker rod string, has a circular cross-section, and is precisely machined to ensure a complete seal ...
... assembly at the wellhead. The upper part of the rod is fitted with a polished rod clamp, which is connected via cables to the horsehead. The driving unit, known as the horsehead, is used to operate the plunger of the deep well pump. It facilitates the lifting and lowering of the smooth rod and sucker ...Maja Trikić. Application of machine learning for diagnosing the operation of a deep well pump in oil production, 2024
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GIS Application Improvement with Multilingual Lexical and Terminological Resources
... ‘fine tuned’ in order to obtain an optimal balance between recall and precision. To illustrate semantic expansion, the query for geological unit retrieval with the term ‘facie’ (‘facija’ in Serbian) in their description field was submitted twice: once without and once with semantic expansion ...Ranka Stanković, Ivan Obradović, Olivera Kitanović. "GIS Application Improvement with Multilingual Lexical and Terminological Resources" in Proceedings of the 5th International Conference on Language Resources and Evaluation, LREC 2010, Valetta, Malta, May 2010, Valetta, Malta : European Language Resources Association (2010)
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Mineral Resources of Serbia: Environmental, Societal and Economic Challenges
... Karst Unit, 4. Pre-Karst and Bosnian Flysch Unit, 5. East Bosnian-Durmitor Thrust Sheet, 6. Dinaric Ophiolitic Belt, 7. Western Vardar Ophioliic Unit, 8. Drina-Ivanjica Thrust Sheet, 9. Jadar-Kopaonik Thrust Sheet, 10. Sava Zone, 11. Eastern Vardar Ophiolitic Unit, 12. Serbo-Macedonian Unit, 13. ...
... an external foredeep (Figure 1). The Dinarides consist of the following units: East Bosnian-Durmitor Unit, Dinaric (External) Ophiolite Belt, and Drina-Ivanjica Unit. The East Bosnian-Durmitor Unit includes a Palaeozoic basement, covered by unmetamorphosed Triassic to Paleogene neritic and pelagic ...
... 2011). Anisian to Ladinian porphyrite is typical for that unit. Towards the east it is overthrust by the Dinaric or External Ophiolite belt (Dimitrijević 1997), made of Jurassic ophiolite and sub-ophiolite melange. The Drina-Ivanjica Unit consists of Palaeozoic metamorphic complex, overlain by ...Vladimir Simić, Rade Jelenković, Dragana Životić. "Mineral Resources of Serbia: Environmental, Societal and Economic Challenges" in Serbia: Current Issues and Challenges in the Areas of Natural Resources, Agriculture and Environment,, Nova Science Publishers, Inc. (2019)
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Electronic Dictionaries - from File System to lemon Based Lexical Database
In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...... dictionary candidates, with their lexical and derivation variants. This automatic procedure enabled migration of all 26 simple word and 15 multi-word unit Serbian dictionary files with more than 150,000 lexical entries. Keywords: lexical database, lemon, electronic dictionaries, lexical model, lexical ...
... org/ Figure 1: Data categories (markers) dictionary. The main class of the core of the lexicon model is the class LexicalEntry, representing a unit of analysis of the lexicon, which encompasses a set of inflected forms that are grammatically related, and a set of base meanings that are associated ...Ranka Stanković, Cvetana Krstev, Biljana Lazić, Mihailo Škorić. "Electronic Dictionaries - from File System to lemon Based Lexical Database" in Proceedings of the 11th International Conference on Language Resources and Evaluation - W23 6th Workshop on Linked Data in Linguistics : Towards Linguistic Data Science (LDL-2018), LREC 2018, Miyazaki, Japan, May 7-12, 2018, European Language Resources Association (ELRA) (2018)