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Упит dcterms_subject_txt:intervención de pozos petroleros

489 items

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...
    mine planning, variability of coal quality, simulation, coal blending

  • Analiza primene višekriterijumskih metoda u optimizaciji izbora hidruličnih bagera na površinskim kopovima uglja

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Filip Miletić, Ivan Janković (2019)
    Hidraulični bageri primenjuju se u različitim oblastima privrede a najzastupljeniji su u građevinarstvu i rudarstvu. Na površinskim kopovima sa kontinualnim sistemima, klasifikuju kao pomoćna mehanizacija a na površinskim kopovima sa diskontinualnim sistemima, kao osnovna mehanizacija. Kako je u oba slučaja njihova primena neizostavna, važno je izvršiti adekvatnu analizu postojećih podataka, u cilju optimizacije izbora tipa hidrauličnog bagera u odnosu na uslove rada datog površinskog kopa. U radu su opisane različite višekriterijumske metode koje su korišćene za analizu hidrauličnih bagera. ...
    višekriterijumske metode, površinski kop uglja, pomoćna mehanizacija, hidraulični bager
    ... (5) gde je: J – broj alternativa Alternativa aj je multikriterijumski bolja od ak ako je φj > φk . Prema definisanom matematičkom modelu meto- de PROMETHEE, dobijeni su sledeći rezultati za raz- matrani izbor. Tabela 7. Rezultati primene PROMETHEE metode PROMETHEE Alternativa proizvođač ...
    ... dalje tumačiti AHP metoda. Ona daje ocenu alternativa prema svakom od razmatranih kri- terijuma. Pored hidrauličnih bagera, višekriterijumske meto- de mogu se primeniti i u analizi drugih rudarskih maši- na radi kvalitetnijeg praćenja njihovog trenutnog rada ali i radi adekvatnog izbora pri eventualnoj ...
    ... optimal envoi- rmental reclamation of an open-pit mine. Eviron- mental Geology, 52, pp. 663-672. 2007. [9] Mohamadibadi H S, Tichkowsky G, Kumar, A. De- velopment of a Multi-Criteria Assessment Model for Ranking of Renewable and Non-Renewable Trans- portation Fuel Vehicles, Energy, 34, pp. 112-125, ...

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... hyponym - hy- pernym relationship between the concepts related to terms. more elaborate relationships between concepts that include meronyms, antonyms, de- rived terms, etc. cannot be represented by using a tree structure, which is why graph structures are applied to describe semantic relations. Such ...
    ... been aligned with the Princeton WordNet, which allows their use in many multilin- gual applications (Obradović et al., 2008). WordNet has become a de facto standard for semantic networks based on the premise that in the human mind, words, as the fundamental ele- ments of language, group around ...
    ... terminological system. It focuses not only on the classification of the geologic material, but also on very precisely defined terms that are used to de- scribe the properties of that material, including its genesis. The terminology of the geological Survey of canada, originally developed independently ...

  • 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

  • An Approach to Efficient Processing of Multi-Word Units

    Cvetana Krstev, Ivan Obradović, Ranka Stanković, Duško Vitas (2013)
    Efficient processing of Multi-Word Units in the course of development of morphological MWU dictionaries is not easy to achieve, especially when languages with complex morphological structures are concerned, such as Serbian. Manual development of this type of dictionaries is a tedious and extremely slow process. To alleviate this problem we turned to our multipurpose software tool, dubbed LeXimir, in the production of lemmas for e-dictionaries of multi-word units. In addition to that, we developed a procedure aimed at making ...
    Natural Language Processing, Grammatical Category, Lexical Representation, MWU, multi-word unit
    ... have to be collected, generated, and inflected. 2 Inflection of MWUs In order to produce a list of MWU forms in a systematic way, it is necessary to de- cide what the lemma of all these forms is, what are its additional features, how do its simple word constituents inflect, and what is the inflectional ...
    ... basic structures, e.g. can a MWU have plural forms, can a separator be omitted or replaced by another separator, etc. The basic structure, however, de- termines the general form of a MWU lemma and information that has to be supplied for its constituents. Table 1 Different interpretations of the sequence ...
    ... options offered, which is, as we have seen, the correct one in most cases. Query expansion in the web environment offers different levels for expansion de- tails. VebRanka accepts the query from the user and submits it to the local web ser- vice, which then expands the query and forwards it to the Google ...

  • Uticaj površinske obrade kamena na promenu primarne poroznosti

    Ana Radivojević (2024)
    Površinska obrada kamena je izuzetno bitna kod stena koje se koriste u izgradnji svih vrsta objekata. Površinskom obradom se direktno utiče, ne samo na estetska svojstva kamena nego i na njegove fizičko-mehaničke karakteristike. Cilj ovog završnog rada je analiza uticaja poliranja i rezanja kao tehnoloških procesa obrade na poroznost odabranih vrsta arhitektonsko-građevinskog kamena. Ispitivane stene su gabro „Nero Assoluto“, granit sa površinskog kopa „Ploče“, granit African Red, krečnjak sa lokaliteta „Skržut“ i krečnjak poznat pod nazivom „Sirogojno crveni“.
    polirana površinska obrada kamena, rezana površinska obrada, poroznost, kapilarno upijanje vode
    ... A., Benavente, D., Bernabću, A., Martinez-Martinez, J., 2007. Estudio del efecto de los acabados superficiales en granitos y calizas para su aplicaci6n en pavimentos exteriores de baldosas de piedra. Materiales de Construcci6n. Vol. 58, 289-290, 65-79 63 Hill Malcolm, Fred Barker, Don Hunter ...
    ... glavnom delu Bušveldskog kompleksa ima pružanje 310 km u pravcu I-Z, i 120- 210 km u pravcu S-J (Hill et al., 1996, Cawthorn et al., 2006, Coetzee, 1984; De Beer et al., 1987; Kinnaird et al., 2003, 2004; Kleemann & Twist, 1989; McCarthy & Hasty, 1976; Wilson et al., 2000). Detaljnim mineraloškim, pe ...
    ... granitnih stena, Poslovna zajednica „Kamergran“, Beograd • Blenkinsop, T. G., Martin, A., Jelsma, H. A., Vinyu, M. L., 1997. The Zimbabwe Craton In: de Wit, M.J., Ashwal, L., Jones, D.L.D. (Eds.), Greenstone Belts. Oxford University Press, pp. 567—580. • Cawthorn, R. G., Eales, H. V., Walraven, F ...

  • A Description of Morphological Features of Serbian: a Revision using Feature System Declaration

    Cvetana Krstev, Ranka Stanković, Vitas Duško (2010)
    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 ...
    Morphology, Lexicon, lexical database, Standards for LRs
    ... Inadequacies of Existing Descriptions We will illustrate inadequacies of existing morphological descriptions for Serbian on MULTEXT-East, serving as de facto standard for involved languages for many years. They can be grouped in several categories. (a) The lack of a value for an existing category. ...
    ... grammars. The ELAG system", Lingvisticae Investigationes XXII, Amsterdam-Philadelphie : Benjamins, pp. 341-367. Lee, K., Burnard, L., Romary, L., de la Clergerie, E., Declerck, T., Bauman, S., Bunt, H., Clement, L., Erjavec, T., Roussanalay, A., Roux, C. (2004) “Towards and international standard ...

  • Proširivanje upita zasnovano na leksičkim resursima

    Ranka Stanković, Ivan Obradović, Cvetana Krstev (2009)
    U radu je opisano kako se leksički resursi za srpski jezik i softverski alati, razvijeni u okviru Grupe za jezičke tehnologije Univerziteta u Beogradu, mogu koristiti za unapređenje postavljanja upita. Rezultati pretrage mogu biti značajno unapređeni korišćenjem različitih leksičkih resursa, kakvi su morfološki rečnici i semantičke mreže. Izloženi pristup može se iskoristiti i u Sistemu naučnih, tehnoloških i poslovnih informacija, jer je efikasno pretraživanje ovog dragocenog resursa, imajući u vidu njegovu heterogenost i obim, kao i preovladavajući tekstualni sadržaj, ...
    ... the 6th and 7th INTEX/Nooj Workshop, S. Koeva, D. Maurel, M. Silberztein (eds.), Formaliser les langues avec l'ordinateur: De INTEX à NooJ, Presses Universitaires de Franche Compte, Paris, 2007. [4] Fellbaum C. (ed.) (1998) WordNet: An Electronic Lexical Database, The MIT Press. [5] Maurel ...

  • XRD dertermination od hydrothermal phases related to epithermal mineralization in the Čukaru Peki deposit

    Dragana Bosić, Vladica Cvetković, Miodrag Banješević, Kristina Šarić (2024)
    Čukaru Peki, epithermal mineralization, hydrothermal alterations

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... Multidisciplinary Research, University of Belgrade Faculty of Technology and Metallurgy, University of Belgrade e Z _ -— M, e V A7th o nfayanca dE _N 7CS CS - 20 23 the Serbian Society for Ceramic Materials { June 14-16. 2023. Belgrade Serbia — , b " AYNR 1 / V M_ TMK a 780 T / – Edited ...

  • Отпад из процеса сагоревања угља као сировина за добијање елемената ретких земаља

    Бојан Земљак (2024)
    Због великог броја индустрија у којима се користе ови ресурси, глобална економија се у великој мери ослања на елементе ретких земаља. Елементи ретких земаља су есенцијална сировина — материјал за развој савремених технологија, али у односу на њихову огромну потражњу, њихово вађење је ограничено и повезано је са значајним утицајима на животну средину. Због њихове ограничене доступности, проблема који се јављају при процесима експлоатације, све више и више земаља почиње да тражи повољније могућности вађења елемената [REE] из секундарних ...
    Елементи ретких земаља, резерве, употреба, представници и методе опоравка елемената ретких земаља
    ... karth Elements: An Introduction, p.15-52. [111] Souza, A.G.O., 2016. Recuperacđo de Oxido de escdndio de alta pureza de residuos industriais da cadeia de producđo do ni{quel (Doctoral dissertation, Universidade de Sao Paulo). [112] Morgan, K., 2012. Australia: A very short introduction. OUP Oxford ...
    ... 347-381. [26] Oudet, X., 1989. Rare earth electronic configurations and 3d—— 4f transitions. In Annales de la Fondation Louis de Broglie (Vol. 14, No. 4, pp. 469-499). Fondation Louis de Broglie. [27] Brown, L.D., 2014. Bond valence theory. Bond Valences, p.11-58. [28] Maier, J., 2023. Physical ...
    ... HKe JaKe Tpye [LREE] enmeMeHara H HOHeKajl yKJbyuyjy H JO CaMapHjyMA, a IIITO Ce THUC TCHIKC rpyme [HREE] eneMeHara, oHa nouumPe OJL caMapHjyMa [De Boer, Lammertsma, 2013. ; Omodara, Pitkdšaho,Turpeinen, Saavalainen, Oravisjirvi, Keiski, 2019.} [21,22]. Ilonekan ce nperm3Ha KJacH(DMKamja OKCHJa ...

  • Using English Baits to Catch Serbian Multi-Word Terminology

    Cvetana Krstev, Branislava Šandrih, Ranka Stanković (2018)
    In this paper we present the first results in bilingual terminology extraction. The hypothesis of our approach is that if for a source language domain terminology exists as well as a domain aligned corpus for a source and a target language, then it is possible to extract the terminology for a target language. Our approach relies on several resources and tools: aligned domain texts, domain terminology for a source language, a terminology extractor for a target language, and a ...
    aligned texts, word alignment, terminology extraction, electronic dictionaries, morphological inflection
    ... as excellent (the highest grade 6). To the contrary, the similar survey for Serbian (Vitas et al., 2012) showed that lexical resources are much less de- veloped – they were rated 1–2.5. 2. Terminology consists mainly of Multi-Word Terms (MWT) (data presented in Subsection 4.2. corrobo- rate this claim) ...
    ... reduced the list to 982,598 aligned chunks. For the second step we provided Bag-of-Words (BoW) rep- resentation for the English terms from the Dictionary (de- scribed at subsection 4.2.) and removed stop words from the list, so the list is mainly populated with domain words. Then we lemmatized each token from ...
    ... that translate as English SWTs. We eliminated these pairs, but also stored them in a separate file, so we can use them while obtaining final results (de- scribed throughly in Section 5., step 6). Final list contained 491,990 translation pair candidates. We decided to enrich corpus with additional parallel ...

  • Дефинисање параметра песковитог тла за потребе прорачуна слегања плиткох темеља преко CPTm и CPTu опита

    Александар Јаковљевић (2024)
    Дефинисање меродавних геотехничких параметара тла за потребе прорачуна слегања.(a и носивости)темељног тла један је од главних задатака инжењера геотехнике.Од поузданости ових параметара и последично резултата прорачуна слегања и носивости, директно зависи који ће се тип, врста и димензије темеља као и начин фундирања истог примењивати.Да би се поуздано дефинисали неопходни геотехнички параметри а потом и извели потребни прорачуни слегања, потребно је на првом месту познавање деформабилних карактеристика тла.Подаци о збијености тла могу се добити или лабораторијским испитивањима на претходно ...
    CPT, песак, слегање, параметри, корелације
    ... KopeHmucaHe ca pe3ynrTaTHMMa CTaTHUKC neHerTparuije cy: • De Beeri Martens (1957, 1965) • Schmertmann (1970, 1978) 35 3.I De Beer and Martens (1957, 1965) Jenny 0J MeTOJIa KOJa ce 34CHHBa Ha IIOCMaTpaMbb»y cJIeraPba TeMeJba KpeHpajii cy De Beer i Martens (1957). IIpenzntoxunu cy cnmeneha M3pay3 ...
    ... 1ER RE 8a ž 1E ŠAG 12 18 BBSS 188 136 Bs 199 138 53 128 185 HNI 1E DE3 BE oO NN N N 1E BJ M O JJ JJ 38 BO | GiM 1BEA OJ I P MBJ Te _8 PGSN | SOČOE DE i Syed __ — al -- M I — Cnuka 2,10 Quna.inhu txt. bajn RHakoH Cnuka 2,11 EnekmpuuHu nue30KOH usae0eHoo onuma PasmakyJy ce caenehe BenHuHHe KOJe ...
    ... mrro cy Geologismiki CPeT-IT v.3.0 ı GEO5 Geotechnical Softvare, a MOTY Ce HanpaBHTu H je/JHOcTaBHHjH coO(DTBepu y Microsoft Excel-y (Cnuka 2,12). De pt h (m) N N A V V V Cnuka 2,12 BIB 200 - 40D Tip resistance (MPa) Friction (kPa) Cnuka 2,13 Cnuka 2,14 Hnmepnpemauuja Hnmepnpemauuja ...

  • 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

  • Back-arc underplating provided crustal accretion affecting topography and sedimentation in the Adria microplate

    Paolo Mancinelli, Vittorio Scisciani, Cristina Pauselli, Gérard M. Stampfli, Fabio Speranza, Ivana Vasiljević (2021)
    Supported by evidence of deep crustal sources for the observed magnetic anomalies in Central Italy and by outcropping gabbros in the Croatian archipelago, we model the observed gravity and magnetic anomalies in the Central Adriatic Sea and surroundings. We suggest that the major magnetic anomalies in the area are related to a wide underplating and propose that this volume represents the first stage of the back-arc Adria continental breakup in Early Permian times. During the Palaeotethys-Adria collision, underplating has ...
    Underplating, akrecija kore, Magnetske anomalije, Jadranska ploča

  • A Tel Platform Blending Academic And Entrepreneurial Knowledge

    Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović (2013)
    ... Technology has been formed. Its core members, Delft University of Technology, Universidad Politécnica Madrid, Universitat de Barcelona, Katholieke Universiteit Leuven and Université de Lyon are presently offering over 14,000 courses online In recent years over fifty European partners from Austria, ...

  • Influence of Ag doping on the morphological and magnetic properties in CuO nanopowders

    Maria Čebela, Uroš Čakar, Vesna Lojpur, Maja Milošević, Sanja Krstić, Vladimir Dodevski, Milena Rosić (2023)
    ... Multidisciplinary Research, University of Belgrade Faculty of Technology and Metallurgy, University of Belgrade e Z _ -— M, e V A7th o nfayanca dE _N 7CS CS - 20 23 the Serbian Society for Ceramic Materials { June 14-16. 2023. Belgrade Serbia — , b " AYNR 1 / V M_ TMK a 780 T / – Edited ...

  • Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils

    Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)
    MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii
    ... XRD and Raman results regarding crystallinity in all samples. The morphology and crystallite size of CaCO3 crystals induced by the bacterial activity de- pends mainly on the relative crystal growth rate in all directions. Moreover, the growth rate depends on the cell surface processes and is highly sensitive ...
    ... ed calcite precipitation for monumental stones conservation: Methods of evaluation. J. Microbiol. Meth. 2019, 36, 139–145. [CrossRef] 7. Ersan, Y.; De Belie, N.; Boon, N. Resilient denitrifiers wink at microbial self-healing concrete. Inter. J. Environ. Eng. 2015, 2, 28–32. 8. Achal, V.; Mukherjee, ...
    ... and carbonic anhydrase in carbonate mineralization. Appl. Biochem. Biotechnol. 2014, 172, 2552–2561. [CrossRef] 14. Hammes, F.; Boon, N.; Clement, G.; de Villiers, J.; Siciliano, S.D.; Verstraete, W. Molecular, biochemical and ecological characteri- zation of a bio-catalytic calcification reactor. Appl ...

  • 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

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija