Претрага

Упит dcterms_creator_txt:Zdravkov A.

1498 items

  • Примена ПСП пумпи за експлоатацију вискозних флуида

    Алекса Трифуновић (2024)
    Производња парафинске нафте се током историје одвијала уз помоћ дубниских клипних пумпи, све до појаве ПСП система који су показали боље каратеристике и већу ефикасност. Функционални дизајн пумпе омогућава производњу вискозних и абразивних мултифазних флуида, уз ниска капитална улагања. У раду је анализирана проблематика рада укључују губитке протока флуида, производњу песка, оштећење клипних шипки и тубинга и сам притисак на дну бушотине. Рађена је студија случаја за нафно лежиште „М“ у коме је приказан цео производни век почевши од ...
    парафинска нафта, систем ПСП, производња нафте, студија случаја
    ... He3MHr 3aBojHa nyMna “0nekcM6WnHa ocoBMHa Penykrop Tiporekrop EnekrpoMoTop ŽO VN A NNN N N N N N N A A A N A A NN NN NN N N N N NN AA A N N N A A A NN N NN N NN NA N N N A Cnuka 16 Cucmew enekmpuune ICII nyune CucTeM eJteKTpHuHux IICII nywr H peryaaTropoM (bp ...
    ... TyOHHTA4a lı naa a naanaaaaaaaaaaaaeaaaaaaaaavNt 11 2.1.4 Hwunak rpurucak Ha JIHy OyHIOTHHC alyn a aaaaaaaaaaaaaaaaeeaaaaeeaaaaaaaataı 12 3 VruyrcrBo 3a yrpajuby „PCP“ HyMIMCaaaaaaaaaaaaa a a a aaaaeaaaaaeaaaaaoNaatete 13 3.1 MuHcraznanunja CraTopa al aaaaaaaaaaaaa a a aa a a aaaaaaaateaaaaaataoNt ...
    ... aoat 14 3.3 Mncramamuja moroHcKor ypebaja a (Drive Head) .........aaaa a aanaaananeteot 17 4 · Crynmaja cmnyuaaja- HadirHo nojbe “MM“ altyaa a nanaeaaaaaaaaaaaaaaaaaaeaaaoaaatattt 19 FORUO:4:107 RRRGAAA 19 4.2 OCHOBHH TIOJA ......aaa n a da a a a aaaaaaaaaaaattaaatattt 20 43 · TeodpaMsHuka ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes

  • 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

  • Is the Sava-Vardar zone a remnant of an Upper Cretaceous ocen? Pro et contra

    Vladica Cvetković, Dejan Prelević, Ana Mladenović (2024)
    Neotethys, ocean closure, subduction
    ... K., Grubić, A., Cvijić, R., & Milošević, A. (2014). The Upper Cretaceous ophiolite of North Kozara-remnants of an anomalous mid-ocean ridge segment of thc Neotethys. Geologica Carpathica, 65(2), 117-130. 5. Galihofer, D., Quadt, A. V., Peytcheva, L, Schmid, S. M. & Heinrich, C. A. (2015). Tectonic ...
    ... European continent. This argument rclies upon the fact that the ABTS belt exhibits " a number of petrological and metallogenetic characteristics implying a typical subduction cnvironment [5]|. This generally includes a vast predominance of ~ andesites (+basaltic andesites) that possess typical su ...
    ... ) zircon populations in both Adria and Europcan basement, with a morc pronounced Variscan signal on the Europcean side and with a consistent Permotriassic signal in Adria units. All investigated Cretaceous SVZ sediments possess a strong Permotriassic signal, suggesting that even those sediments ...

  • Утечњени природни гас (УПГ) – технологија производње и регасификације

    Јована Милетић (2024)
    У овом раду истраживање је обухватило сагледавање карактеристика утечњеног природног гаса као извора енергије и његове улоге у савременој расподели потрошње енергије на глобалном и европском нивоу. Проучени су елементи тржишта утечњеног природног гаса, сектори коришћења, транс-портне руте и количине испорука. Сагледан је пут природног гаса од лежишта до корисника преко утечњавања и транспорта у резервоарима, са посебним акцентом на технологијама производње и регасификације. Објашњено је пречишћавање сировог природног гаса ради уласка у процес утечњавања, процеси утешњавања и настојања ...
    утечњени природни гас, технологија производње и рега- сификације, транспорт, директно коришћење УПГ-а, могућност коришћења УПГ-а у Србији
    ... _ _ _ _ _ _ _ | M || yw 2 B I i : U : i u a j o g a a a t n wW 3: w- -: : B i o g o o g o g g g g g o r i · G B U u U E I I as r- 2: B g o g o o a g a a a a a ? n , ) } " , > E | — G S C B H H ce r- 2: B i g u g a r a m a g 0 r r g r U j 0 . t „ = N or -2 : Bi ...
    ... 2024. Affandy, S. A. et al. (2020). A technical and economic evaluation of trimethylene glycol regeneration process using flash gas as stripping gas in a domestic natural gas dehydration unit. DOI: 10.1002/eng2.12153 Aleksić, A. (2024). Tečni prirodni gas (LNG). Alhajji, A. (2023). EU Gas Imports ...
    ... OnMcaHe cy KapaKTepMCTHKe TCpeTHMHX BO3HMA KOJC npeBo3e VIII' a Behe yaJbeHoOcTMH, KaO H KapakTepHcTHKe cKJajHmrTa. Tpehm meo pama OaBHM ce KopumihemeM VIII-a KaO HOTOHCKOT TOpHBa. CymruHa oBor „nena jecre To a VIII nuje caMO HauHH a Ce TpaHCIIOpTyje HpH- pojmHu rac, Beh je H rOpHBO KOJe Ce MO;Ke ...

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... b ia n C a r p a t h i a n s S e r b ia n C a r p a t h i a n s B a l k a n i d e s B a l k a n i d e s M o e s i a n M o e s i a n P m l a t r f o P m l a t r f o T F T F TFTF C F C F M o r a v a V a l l e y C o r r i d o r M o r a v a V a l l e y ...
    ... Danube Danube V e lik a M o ra v a V e lik a M o ra v a J u žn a M o ra v a J u žn a M o ra v a T i m o k Z o n e T i m o k Z o n e S redna G ora S redna G ora Zone Zone S o u t h C a r p a t h i a n s S o u t h C a r p a t h i a n s ZagajicaDepression Z ...
    ... an sediments Sedimentary cover Covered or suggested fault AlpsAlps A p e n n in e s A p e n n in e s C a rp a th ia n s C a rp a th ia n s ALCAPAALCAPA Tisza-D acia Tisza-D acia D inarides D inarides A d ria A d ria H e lle n id e s H e lle n id e s Balkan sideBalkan side ...

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... a.) and KF (Centrohem, 99 %). A total of 0.055 g of a mixture of Eu2O3 and SiO2 in a molar ratio of 1:4 was added to 1 g of KF. The resulting mixture was homogenized in an agate mortar, transferred to a platinum crucible covered with a platinum lid and placed in a resistance-heated furnace. The ...
    ... were conducted on a Gemini S (Oxford Diffraction) four-circle diffractometer equipped with a Mo-anode sealed tube and a Sapphire3 CCD detector. Diffraction data were processed with the CrysAlisPro.17 The synthesized pro- ducts were tested using X-ray powder diffraction (XRPD). A small amount of material ...
    ... oxygen ions and forms a K1O2+4+2 coordination polyhedron which can be described as a distorted hexagonal pyra- mid with a split apex [distances range from 2.770 (5) to 3.049 (5) Å]. K2 atom is coordinated by nine oxygen atoms with distances from 2.923 (4) to 3.029 (3) Å providing a regular tricapped ...

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... transport deposits in trench-like basins in front of a propagating nappe stack, are commonly overprinted by multiple deformational events or reworked by tectonics, showing the typical features of a mćlange. To distinguish a tectonic from a sedimentary mćlange (Hsi 1968, 1974; Gawlick & Frisch ...
    ... cover of ophiolites in a higher nappe position (Fig. I0b,c), a more convincing possibility (Fig. 9; see also discussion). Therefore we assign the ophiolitic mćlange in the eastern part of the Dinaridic Ophiolite Belt originally to be a sedimentary mćlange, depo- sited in a trench-like basin in ...
    ... rized in Chiari et al. 2011). There is a controversy about the genesis of the ophiolitic mćlange: A) Tectonic origin with incorporation of blocks from TRIASSIC RADIOLARITES FROM A MIDDLE JURASSIC OPHIOLITHIC MELANGE — INNER DINARIDES 361 W E a Middle-Late Triassic passive margin configuration ...

  • Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles

    Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)
    Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... P, Sabatini A, Vacca A (1999) Ann Chim 89:45 50. Gans P, Sabatini A, Vacca A (1996) Talanta 43:1739 51. Sullivan BP, Calvert JM, Mayer TJ (1980) Inorg Chem 19:1404 52. Bugarcic ZD, Soldatovic T, Jelic R, Alguero B, Grandas A (2004) Dalton Trans 3869 53. Alderighi L, Gans P, Ienco A, Peters D, Sabatini ...
    ... always large enough (at least a tenfold excess) to provide pseudo first-order conditions. The kinetic traces gave an excellent fit to a single exponential (Supplemen- tary Material Fig. 2S). Potentiometric measurements Potentiometric titrations were carried out in a double- walled glass vessel, ...
    ... In this study, the convention has been adopted whereby a complex containing a metal ion, M, proton, H, and ligand, L, takes the general formula MpHqLr, where p, q, and r are the stoichiometric indices of the components in the complex. A negative value for q refers to proton removal or hydroxide ...

  • 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
    ... 2 2 n 21 22 2n n 1 n 2 n n n1 n2 nn / / ... / ... / / ... / ... ... ... ... ... ... ... ... ... / / ... / ... w w w w w w a a a w w w w w w a a a M w w w w w w a a a                          (7) Poslednji korak u AHP metodi je provera konzi- stentnosti donosioca odluke ...
    ... uvode se tokovi preferencije: 1 ( ) ( , ) j j j m m a a a     (3) 1 ( ) ( , ) j j m j m a a a     (4) Kako bi se ostvarilo multikriterijumsko rangiranje uvodi se neto tok: ( ) ( ) ( ); 1, ... ,j j j ja a a j J      (5) gde je: J – broj alternativa ...
    ... idealno (A+) i anti-idealno (A-) rešenje, a zatim se računa udaljenost svake alternative od idealnog rešenja (Si +, Si -) [17]:  ' '' 1 2| | , ,..., ...,ij ij j n MAX MIN A v j K i v j K v v v v i i                 (20)  ' '' 1 2| | , ,..., ...,ij ij j n MIN MAX A v j K i ...

  • Kristalne strukture Cs2HoSi4O10F i Cs2TmSi4O10F

    Predrag Dabić, Sabina Kovač, Aleksandar Kremenović (2021)
    ... 2 P. Dab V. Kahlenberg, D. Schmidmair, A. , P. , Z. Krist.-Cryst. Mater., 231 (2016) 195 207. 27th Conference of the Serbian Crystallographic Society 85 CRYSTAL STRUCTURES OF Cs2HoSi4O10F AND Cs2TmSi4O10F P. Dabi a, S. a, A. Kr a a bia e-mail: predrag.dabic@rgf.bg.ac.rs ...
    ... publications. - The Repository is available at: www.dr.rgf.bg.ac.rs XXVII 84 KRISTALNE STRUKTURE Cs2HoSi4O10F I Cs2TmSi4O10F P. Dabi a, a, A. a a Univerzitet u Beogradu, Rudarsko- bija e-mail: predrag.dabic@rgf.bg.ac.rs fokusiranog na sintezu novih kalijumskih silikata elemenata retkih ...
    ... na odabranim monokristalima. Dobijena jedinjenja su i r prostornoj grupi Pnma sa slede elija: a = 22,3809 (7), b = 8,8686 (3), c = 11,9827 (4) , V = 2378,41 (14) 3, Z = 8 (za jedinjenje Cs2HoSi4O10F), a = 22,3447 (5), b = 8,8131 (2), c = 11,9594 (3) , V = 2355,12 (10) 3, Z = 8 (za jedinjenje Cs2TmSi4O10F) ...

  • An Approach to Development of Bilingual Lexical Resources

    Stanković Ranka, Obradović Ivan, Trtovac Aleksandra (2012)
    ... The user can search this resource by entering a keyword (a term or part of a term) in the search field, selecting a search option: “contains”, “starts with” or “exact match”, and invoking the search. Matches found in Serbian are presented in a box on the left hand side, while the box on the ...
    ... Serbian and English wordnets connected via the interlingual index, and a bilingual Dictionary of Librarianship, as well as on a TMX document collection generated from aligned Serbian-English journal articles published in INFOtheca, a scientific journal in the area of Library and Information Sciences ...
    ... translational equivalents {stub, stubac, kolona} and {kolumna, rubrika, novinski stubac}. When the user enters a synset, with its terms separated by a comma, the system first checks whether a synset with these terms already exists in its database. If not, the system checks whether all terms from ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... on several stemmers was reported: a stemmer as a part of a larger system for information retrieval, PoS tagging, shallow parsing and topic tracking [9], a stemmer and lemmatizer based on suffix stripping [5], the same basic idea being used in the stemmer presented in a later paper [11]. The only stemmer ...
    ... is added, for example location, then keywords which define the desired location are entered, e.g. Bor (the name of a city) or Borski okrug ‘Bor county’. If we want a MWU to be treated as a whole, then it is entered under quotation marks. The search is performed by scanning the text of appropriate fields ...
    ... which means that a named entity can be nested within another named entity, e.g. a persons name within an organization name, like in Institut za vodoprivredu “Jaroslav Černi” ‘Institut for waterpower engineering Jaroslav Černi’. The Serbian NER system is a handcrafted ...

  • Multihazard Exposure Assessment on the Valjevo City Road Network

    Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović (2019)
    Prirodni hazardi, izloženost, klizišta, poplave, bujice, GIS, R

  • Српски језик у дигиталном добу -- The Serbian Language in the Digital Age

    Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević (2012)
    Serbian language
    ... experts, or on a statistical language model. In this case, a model calculates the probability of a particular word occuring in a specific position (e. g., between the words that precede and follow it). For example, plaa laguna (blue lagoon) is a much more probable word se- quence than plaa Laguna (where ...
    ... прозором прозорима Локатив прозору прозорима 3: Пример именичке деклинације ‚ Марија јауку ае Јовану. ‚ Јовану ае Марија јауку. ‚ Јовану Марија ае јауку. ‚ Јауку Марија ае Јовану. ‚ Јауку Јовану ае Марија. ‚ Дае Марија јауку Јовану. ‚ Дае Јовану јауку Марија, итд. Поједини конституенти ...
    ... ticular string of words in a document represents a com- pany name, using a process called named entity recogni- tion. A more demanding challenge is matching a query in one language with documents in another language. Cross-lingual information retrieval involves automati- cally translating the query into ...

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Производња и одржавање рударске опреме на примеру предузећа Колубара метал

    Вања Миловановић (2024)
    У раду је извршено пројектовање технолошког процеса израде вратила на стругу. Кроз теоријску анализу, дати су основни постулати обраде стругањем, стругови као машине алатке, врсте стругова, начини стругања и примењени алати. У практичном делу, дефинисани су редоследи операција и захвата, режими обраде, изабрана машина алатка и алати за све захвате и одређено укупно време обраде потребно да се направи финални производ. Вратило из студије случаја представља компоненту редуктора погона за копање роторног багера SRs.1200.24/4+VR.
    производно машинство, обрада метала резањем, израда вратила на стругу

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • Combining Heterogeneous Lexical Resources

    Cvetana Krstev, Duško Vitas, Ranka Stanković, Ivan Obradović, Gordana Pavlović-Lažetić (2004)
    development of lexical resources, morphological dictionaries, WordNet
    ... Device+MusicInstr if more semantics is used. Since a wordnet is not structured as a tree, but rather as an acyclic graph, it is possible that a synset has more than one hypernym, which allows multiple paths from a root node to such a synset. This is the case with the synset (show:3) ‘public ...
    ... representation of XSD schema of Serbian WN. The XML Path Language (XPath) provides a language for addressing parts of an XML document. XPath treats an XML document as a tree of interrelated branches and nodes. A node in a XML document can be an element, attribute, processing instruction, comment, textual ...
    ... consists of a dictionary of simple lemmas, a dictionary of compounds (under construction), the corresponding dictionaries of word forms, and morphological finite-state automata that model certain classes of lemmas. The current size of SMD of simple lemmas is around 65.000, and they produce a dictionary ...