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Упит dcterms_creator_txt:Valjarević A.

1497 items

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... C ro a ti ca Geologia Croatica 69/3322 According to this classification, fly ash from PPNT A for May and June belongs to the aluminum-silicate group, and slag belongs to a silicate group, because the module is in the range of 2 to 6. Fly ash from PPNT B, PPKO A and PPKO B belongs to a silicate ...
    ... diffraction method cal properties, chemical and mineral compositions of the fly ash from thermal power plants (PP) „Nikola Tesla A” (NT A), „Nikola Tesla B” (NT B), „Kostolac „A” (KO A) and „Kostolac B” (KO B). The physical properties of the ash and slag facilitate their use as building materials for transport ...
    ... as a construction substitute thus preservinglimited reserves of natural building materials. 2. STUDY AREA PPNT A is the most important producer of electricity in Serbia and is built on the bank of the river Sava. PPNT A is 4 km from Obrenovac, PPNT B is located 16 km upstream from PPNT A (Fig ...

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... with a T max value of about 460 °C. Because kerogen type I has a very narrow temperature range for the oil window, T max is not a reliable maturity indicator for sediments with kerogen type I. T max is also not suitable for source rocks containing kerogens that generate petroleum at a lower ...
    ... associated with a T,nax value of about 460 °C. Because kerogen type I has a very narrow temperature range for the oil window, Tnax is not a reliable maturity indicator for sediments with kerogen type I. T max is also not suitable for source rocks containing kerogens that generate petroleum at a lower level ...
    ... 14-456 points per sample were measured. Standard deviations ranged from 0.038 in a coal sample to 0.061 in a sample with the finest-grained dispersed particles. Vitrinite reflectance, as a well standardized method, is a key diagnostic tool for assessing thermal maturity (ICCP, 1963-1975, 1998; Mukhopadhyay ...

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... map at any scale, but despite this, it is rarely the case that a par- ticular model can be applied that gives the same results for dif- ferent study area. Also, using a large number of conditioning fac- tors in a particular analysis is not a guarantee for successful susceptibility modelling. Factor selection ...
    ... –Karnik (MSK) scale is used as a reference in the presented case study. If other types of seis- mic data are available for a particular region, it can be rated in a similar manner. Figure 1. Flow-chart of the arbitrary polynomial method. G eo lo g ia C ro a ti ca Geologia Croatica 72/184 ...
    ... railways, a highway, well developed network of regional and local roads (mostly in the mountains), ski centers, and a very important hydro energy system consisting of 130 km of water distribution channels accompanied by 167 km of service roads. In a geological context, the study area belongs to a larger ...

  • Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia

    Fen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

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

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

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

  • 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

  • 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 ...

  • 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

  • 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 ...

  • 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) ...

  • 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 ...

  • 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 ...