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Упит dcterms_subject_txt:Well Performance Optimization

297 items

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... expert judgment. The essential comparative advantage of the fuzzy model is that the qualitative meaning of variables is not lost, whether in the performance analysis or in the synthesis Symmetry 2020, 12, 525 4 of 26 of a specific machine’s structure (that is, the result remains in a linguistic form ...
    ... risk-of-failure assessment of technical systems based on fuzzy logic theory consists of several steps: 1. Gathering and sorting existing data on the performance of the system for which the assessment is being made; 2. Fuzzifying the data collected for partial risk indicators; 3. Composition of membership ...
    ... Paris, France, 29 April–2 May 2019; pp. 2134–2142. [CrossRef] 26. Ivezić, D.; Tanasijević, M.; Ignjatović, D. Fuzzy approach to dependability performance evaluation. Qual. Reliab. Eng. Int. 2008, 24, 779–792. [CrossRef] 27. Tanasijevic, M.; Jovancic, P.; Ivezic, D.; Bugaric, U.; Djuric, R. A fuzzy-based ...

  • Mikroelementi u uljnim šejlovima Aleksinca i njihov uticaj na životnu sredinu

    Nikoleta Aleksić (2021)
    ... chitosan hydrogel and its optimization by definitive screening design. European Journal of Pharmaceutical Sciences, 125, 102-109. [9] Pereira, A., Reis M., Leca, J., Rodrigues, P., Marques, J. (2018) Definitive screening designs and latent variable modelling for the optimization of solid phase microextraction ...
    ... Conference Proceedings, 1855, 070004–1–070004–8. [12] Stamenković, O.S., Rajković, K., Veličković, A.V., Milić, P.S., Veljković, V.B. (2013). Optimization of base-catalyzed ethanolysis of sunflower oil by regression and artificial neural network models. Fuel Processing Technology, 114, 101-108. ...
    ... naučni skup iz zaštite životne sredine „Docent dr Milena Dalmacija“, 2021. OR-09 [12] Sachindra, N.M., & Mahendrakar, N.S. (2005). Process optimization for extraction of carotenoids from shrimp waste with vegetable oils. Bioresource Technology, 96, 1195-1200. [13] Rafalowski, R., Zofa, Z., Kuncewicz ...

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... exploration, extraction, extractive metallurgy, geology, equipment, safety, and more,1 or the Corporate Equipment Taxonomy developed by Meridium Asset Performance Management Software2. Terminological resources with 1 http://blog.wandinc.com/2011/10/wand-mining-taxonomy-released.html 2 http://www.meridium ...
    ... packages as well. One of them, OpsteKlase_Ver2 provides the business logic for handling RudOnto. Within the data layer, RudOnto is supported by the DatabaseBroker_Ver2 library, which is also used for manipulation of connection parameters, and for linking to the SUKU relational database, as well as for ...
    ... month and year, as well as for each type of material (coal or overburden) the excavator worked with. The data on the mechanization operation are used for creating reports that show the realized and planned production for a specific period, the realized working hour capacity, as well as the use in terms ...

  • E-Connecting Balkan Languages

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Svetla Koeva (2009)
    In this paper we present a versatile language processing tool that can be successfully used for many Balkan languages. This tool relies for its work on several sophisticated textual and lexical resources that were developed for most of Balkan languages. These resources are based on several de facto standards in natural language processing.
    Query expansion, e-dictionary, wordnet, proper name, aligned text
    ... 1692- 1697, 2006. [10] C. Krstev, R. Stanković, D. Vitas, I. Obradović, The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines, in Proceedings of the Sixth Interantional Conference on Language Resources and Evaluation (LREC'08), Marrakech, Morocco ...
    ... 66,000 literals. The synsets are linked with the PWN as well, again there are 436 Balkan specific concepts shared with other Balkan languages and 182 Bulgarian language specific concepts. Both Serbian and Bulgarian wordnets, as well as wordnets for other Balkan languages, are in WS4LR represented ...
    ... can be successfully used for other Balkan languages as well. Wordnets were being developed through Balkanet project for Greek, Romanian and Turkish, which enabled the experiments with semantic query expansions for those languages as well. For Greek [12] and Romanian [3], morphological dictionaries ...

  • Primena AHP и WoEmetode u proceni podložnosti terena na kliženje za područje opštine Krupanj

    Biljana Abolmasov, Jelka Krušić, Katarina Andrejev, Miloš Marjanović, Ranka Stanković, Uroš Đurić (2017)
    ... with an existing landslide inventory, which was made by field mapping and interpretation of satellite images. Both models have relatively good performance, but WoE has slightly better va- lidation parameters. These results are a solid background for general overview of the landslide susceptibility ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs IZGRADNJA 71 (2017) 7–10, 239–246 239 1. UVOD Procene podložnosti ...

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • 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
    ... PMID: 25602417 Silva Veiga PA, Schultz J, Silva Matos TT, Fornari MR, Costa TG, MeurerL et al. Production of high- performance biochar using a simple and low-cost method: Optimization of pyrolysis parameters and PLOS ONE | hitps://doi.org/10.1371/journal.pone.0277365 November 17, 2022 35/38 PLOS ...
    ... Biochem. 2011; 43: 1169—1179. https://doi.org/10.1016/j. soilbio.2011.02.005. Mai YG, Huang GH. Hydrology and rainfall runoff pollutant removal performance of biochar-amended bioretention facilities based on field-scale experiments in lateritic red soil regions. Sci Total Environ. 2021; 761: 143252 ...
    ... ash content in SW500f as well as in BW550 and the dominant content of SIO> in the ash of HW500f. The leachate of ACI with high content of Al and Si has a particularly low EC value. The UV absorbance of acidified NaOH extracts at 250 nm (A»xso) is presumed to correlate well with aromatic dissolved ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    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 ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... The cnergy sector is in direct correlation with various industries. The O&G industry has a domain role in the energy sector with a space for optimization of production and processing with the aim of reducing GHG emissions. The first prerequisite is developing, the methodology for mapping and calculating ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs e> energija, ekonomija, ekologija, 2023, god. XXV, br. 1 ...
    ... effects. With thc Paris Agreement in 2015, signatory countries achicved international consensus to limit increases in the global average temperature to well below 2%C compared to pre-industrial levels, and to make efforts to limit the temperature increase to 1.55C compared to pre-industrial levels [6] ...

  • Modeliranje sistema upravljanja zaštitom životne sredine u rudarsko-energetskim kompleksima

    Jelena R. Malenović - Nikolić (2016-07-12)
    Efikasnost funkcionisanja sistema upravljanja zaštitom životne sredine u rudarskoenergetskimkompleksima zavisi od stepena sprovođenja usvojene politike zaštiteživotne sredine i primene preventivnih mera zaštite životne sredine. Nedostatakfinansijskih sredstava za unapređivanje tehnologije eksploatacije, transporta, pripreme iprerade energetskih mineralnih sirovina u našim rudarsko-energetskim kompleksima,negativno utiče na ostvarivanje ciljeva zaštite životne sredine, a posledice radnihaktivnosti rudarsko-energetskih kompleksa dovode do smanjenja nivoa kvalitetavazduha, vode i zemljišta...
    rudarsko-energetski kompleks, životna sredina, sistem upravljanja,višekriterijumsko odlučivanje, modeliranje
    ... Identified best environmental management practices to improve the energy performance of the retail trade sector in Europe, Energy Policy 63, 2013, pp. 982–994 81. Heyne, S., Harvey, S., Assessment of the energy and economic performance of second generation biofuel production processes using energy market ...
    ... and BSC Approach for Evaluating Performance of IT Department in the Manufacturing Industry in Taiwan, Expert Systems with Applications 34, 2008, pp. 96-107 187 136. Varma, S., Wadhwa, S., Deshmukh, S.G., Evaluating Petroleum Supply Chain Performance: Application of Analytical Hierarchy ...
    ... opinions of individuals. The research analyses the use of the following methods: the Analytic Hierarchy Process, the Balanced Scorecard for performance, and energy indicators. The aim of this dissertation is to use EMS modelling in mining and energy complexes to create a theoretical foundation ...

  • Развој модела употребног квалитета помоћне механизације на површинским коповима лигнита

    Драгица Јагодић Крунић (2021)
    Тренутно стање помоћне механизације на површинским коповима лигнита је незадовољавајуће узроковано пре свега старошћу и неблаговременом заменом машима услед чега је расположивост недовољна а трошкови експлоатације и одржавања високи. Тренутно стање и захтеви који се постављају пред ове машине указују на неопходност оптимизације процеса управљања помоћном механизацијом. Одређивање оптималног времена замене и преосталих могућности је најодговорнији управљачки задатак који треба да буде заснован на свеобухватном сагледавању економских, техничких и других узрочно последичних веза. Са економског аспекта гледано треба одржавати ...
    помоћна механизација, употребни квалитет, ефективност, расположивост, сигурност функционисања, ризик, трошкови животног циклуса, фази логика, Монте Карло метода
    ... the technical system’s properties related to its operation, and the supporting elements necessary for successful performance. It is defined as the total effect of the work performance determined by the degree of user satisfaction. The analysis of the quality of service is a complex process which demands ...
    ... (Service support performance): „Способност огранизације да обезбеди рад техничког система (услугу) и помогне у извршавању његовог задатка”[31]. 20 Слика 3.1. Употребни квалитет према IEC стандарду [31] Перформансе оперативности (Service operability performance): „Спосбност техничког ...
    ... Перформансе доступности (Service accessibility performance): „Способност техничког система да функционише у границама дозвољеног одступања и под другим условима које захтева корисник”[31]. Перформансе постојаности (Service retainability performance): „Способност техничког система да по ступању ...

  • Terminology Acquisition and Description Using Lexical Resources and Local Grammars

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Biljana Lazić (2015)
    Acquisition of new terminology from specific domains and its adequate description within terminological dictionaries is a complex task, especially for languages that are morphologically complex such as Serbian. In this paper we present an approach to solving this task semi-automatically on basis of lexical resources and local grammars developed for Serbian. Special attention is given to automatic inflectional class prediction for simple adjectives and nouns and the use of syntactic graphs for extraction of Multi-Word Unit (MWU) candidates for ...
    ... classes for newly retrieved MWUs are obtained – they are derived directly from local grammars used for their extraction. 4.3 Evaluation of performance of MWU extraction In order to evaluate our approach, we applied it to a collection of 74 papers in Serbian from the journal Infotheca. 6 The ...
    ... ignore the match AXN that is subsumed. However, in certain cas- es we take into consideration the shorter matches as well. For instance, a sequence recognized as NNgNgNg, may well not be a multi-unit term, but rather consist of two multi-unit terms of the form NNg or contain as its part a AXAXN term; ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Terminology acquisition and description using lexical resources ...

  • 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 ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • Merenje pritiska u bušotinskom cevovodu

    Ratko Matija (2024)
    Merenje pritiska ima veliki značaj u naftovodima i gasovodima. U ovom završnom radu analizirane su različite metode merenja pritiska , kao što su merenje pritiska manometrima sa tečnostima, kapacitivnim manometrima, električnim manometrima nekim drugim. Objašnjena je kalibracija senzora pritiska koja u velikoj meri utiče na tačnost merenja. Navedeni su i objašnjeni elementi cevovoda i u vezi s tim pad pritiska, čije je merenje tema ovog završnog rada.
    merenje pritiska, manometri, kalibracija, elementi cevovoda, pad pritiska
    ... časopisa "Mladi fizičar" u elektronskom obliku. [2] Baker, R. C (2000).Flow measurement handbook: industrial designs, operating principles, performance, and applications. Cambridge University Press. [3] Prodanović, D. (2007). Mehanika fluida za studente Gradevinskog fakulteta. Gradjevinski ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Univerzitet u Beogradu Rudarsko - geološki fakultet Završni ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... tehnicki-izvestaji/TEH_Godisnjak2019_web_s.pdf (accessed on 2 February 2020). 8. European Commission. Improvement of Coal Carbonization through the Optimization of Fuel in Coking Coal Blends (RATIO-COAL); Luxembourg Publications Office of the European Union: Luxembourg, 2015; p. 18. 9. Mitrović, D.; Ðoković ...
    ... thermal pyrolysis. Braz. J. Chem. Eng. 2011, 28, 659–667. [CrossRef] 21. Park, J.W.; Kim, J.H.; Seo, G. The effect of pore shape on the catalytic performance of zeolites in the liquid-phase degradation of HDPE. Polym. Degrad. Stab. 2002, 76, 495–501. [CrossRef] 22. Punkkinen, H.; Oasmaa, A.; Luntama, ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs polymers Article Study of the Synergetic Effect of Co-Pyrolysis ...

  • Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova

    Zoran M. Štirbanović (2015-07-01)
    Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...
    rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina
    ... grubih skupova Univerzitet u Beogradu, Rudarsko-geološki fakultet 112 75. T. Chai, J. Ding, H. Wang, Multi-objective Hybrid Intelligent Optimization of Operational Indices for Industrial Processes and Application, http://eprints.ma.man.ac.uk/1604/01/covered/MIMS_ep2011_30.pdf 76. B. Golomeov ...
    ... of tailings impoundment sites, Die sivilie ingenieur in Suid Afrika, 1983, pp. 537-552. 85. A. MacG Robertson, A. S. Moss, Site selection and optimization studies for mill sites and tailings impoundments, Asian mining, Institution of Mining and Metalurgy, London, 1981, www.robertsongeoconsultants ...
    ... Method for Enrichment Evaluation) TOPSIS - Tehnika za utvrđivanje sklonosti i prema sličnosti sa idealnom rešenju (eng. Technique for Order Performance by Similarity to Ideal Solution) Univerzitet u Beogradu, Rudarsko-geološki fakultet 1 1. UVOD 1.1. Predmet is ...

  • Some models for determination of parameters of the soil oscillation law during blasting operations

    Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić (2018)
    ... the University of Belgrade, Faculty of Mining and Geology. Author Contributions: Suzana Lutovac and Branko Gluščević performed the modelling, optimization and analysis of results. The paper was written by Suzana Lutovac with the support of Rade Tokalić and revised by Čedomir Beljić. Field measurement ...
    ... d by soil characteristics, as well as blasting conditions, where the explosive amount is given by way of the volume. K is being determined by terrain surveying; n—exponent, conditioned by soil properties and mining conditions and determined by field measurements as well; r—distance from the blast site ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs energies Article Some Models for Determination of Parameters ...

  • The external aggregation Newton's method for solving nonlinear equations and applications

    Marija Paunović, Dejan Ćebić, Nebojša Ralević (2020)
    Њутнов метод, агрегациона функција, ред конвергенције

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • Mikroorganizmi - biohidrogeološki indikatori odabranih pojava mineralnih voda Srbije

    Vladimir Šaraba (2021)
    Sa namerom definisanja hidrogeološke uloge i značaja mikrobiološkog diverziteta odabranih pojava mineralnih voda Srbije, primenom sistema biodetektora, dokazano je prisustvo gvožđevitih, sulfato-redukujućih, sluz-produkujućih, heterotrofnih aerobnih i denitrifikacionih bakterija, na osnovu čega je proračunat rizik od razvoja procesa biokorozije i biohemijske inkrustacije, te zdravstveni rizik. Uz procenu rizika, izvedene su analize skenirajuće elektronske mikroskopije biofilmova i hidrogeohemijsko modeliranje, te makroskopska, otpička i difrakciona ispitivanja naslaga inkrustacije, dok je fizičko-hemijskim analizama utvrđena vrednost ukupne mineralizacije iznad 1 g/L, kao i povišeni ...
    biohidrogeologija, SEM analize, makroskopska i optička ispitivanja, rendgenska difrakcija praha, hidrogeohemijsko modeliranje, BART analize, metabarkoding analize mikrobioma, fizičko-hemijske analize, starenje bunara (biokorozija, biohemijska inkrustacija i biozarastanje), zdravstveni rizik
    ... 3929-3936. Silva, K. T., Leão, P. E., Abreu, F., López, J. A., Gutarra, M. L., Farina, M., Bazylinski, D. A., Freire, D. M. G., & Lins, U. (2013). Optimization of magnetosome production and growth by the magnetotactic vibrio Magnetovibrio blakemorei strain MV-1 through a statistics-based experimental ...
    ... y microbiology, 57(2), 243-249. Cullimore, D. R. (1999). Microbiology of well biofouling (Vol. 3). USA: CRC press. Cullimore, R. (2008). Determination of Plugging and Corrosion risks in water wells of all types, Water well rehabilitation workshop protocol 22608. Drycon Bioconcepts Inc., Saskatchewan ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs UNIVERZITET U BEOGRADU RUDARSKO - GEOLOŠKI FAKULTET ...