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337 items

  • Геомагнетни премер на секуларној станици KELE-1001 (Келебија) у мају 2018. године

    Панта Андрејић (2024)
    У овом раду је приказана методологија геомагнетног премера на секуларној станици Келебија. Мерења су изведена у периоду од 08. до 12. маја 2018. године и састојала су се од регистрације дневних варијација, мерења апсолутних вредности угловних елемената и компонената вектора геомагнетог поља и одређивања астрономског севера. Овај вид мерења се често назива магнето-варијациона мерења и саставни су део државног геомагнетог премера за праћење и проучавање геомагнетног поља у систему простор-време.У оквиру обраде података израчунате су апсолутне и базне вредности ...
    секуларна станица, регистрација варијација, апсолутна и базна мерења
    ... TeOMaTHCTHOrT IIpeMepa cekyJ1apHHx cTaHHIa. JIMTEPATyYPA 1. Bartels J., “Discussion of Time-Variations of Geomagnetic Activity, Indices Kp and Ap, 1932-1961”, Extrait des ANNALES DE GEOPHISYOUE; Tome 19, No.l.; Janvier- Mars 1963. . MwxajnopBuh J.C.:"Mopdozoruja BapHjarmja reoMarHeTCKoT IIOJba ...
    ... MarHeToMeTpa — Magson 11. Ha pacrojapy ojr 30 no 40 m oJ Te no3HNHje, Ha HECMAaTHECTHUHOM CTaTHBy, OMO je IHIOCTaBJbĆH CCH3Op HpOTOHcKor HmpenecHoHor MarHeToMerpa GSM 19. Ha ynajbeHocTH OJ OKO 20 m, Ha 4 Cpe)HHH H3Meby no3HIHje CeH3Opa Ta )IBa MaTrHCTOMCTpa, OHO jc HOCTABJbCH JUDBCHH CaHJLyK, ...
    ... 2006; GEOMAGNETIC FIELD MEASUREMENTS AT REPEAT STATIONS IN FORMER YUGOSLAVIA:; Geomagnetics for Aeronatical Safety, NATO Security trough Science Series — C: Environmental Security; ISBN 1- 4020-5024-0; p.p. 43- 57.; Springer; 2006. SPOMENKO J. MIHAJLOVIĆ, ALEKSANDAR ĐORĐEVIĆ, RUDI ČOP, (2010): ...

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... through the entire collection becomes time consuming and inefficient, as the recall grows but precision is likely to drop considerably. Thus in the case of large collections, an additional representation of the document content is generated, formally referred to as the document surrogate, with the aim ...
    ... personal, geopolitical, organizational, etc. Named Entity Recognition. According to [19] the term “Named Entity” (NE) usually refers to names of persons, locations and organizations, and numeric expressions including, time, date, money and percentage. Recently other major types are being included, like ...
    ... Uszkoreit, H. (eds.): META-NET White Paper Series. Springer, Heidel- berg (2012). http://www.meta-net.eu/whitepapers 21. Robertson, S.E., Walker, S.: Okapi/Keenbow at TREC-8. In: TREC, vol. 8, pp. 151–162 (1999) 22. Salton, G., McGill, M.J.: Introduction to modern information retrieval (1983) 23. Stanković ...

  • 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
    ... incubation day) were subjected to structural characterization to observe the influence of incubation time on crystal forma- tion, maturation, and morphology. The precipitates were first studied by using FTIR spectroscopy and X-ray diffraction (Figures 6 and 7). According to the scientific data, the cha ...
    ... 000 rpm, 15 min) and the deposits were washed out three times by sterile distilled water, dried to constant mass. The precipitates were subjected to FTIR spectrophotometric analysis (Hartmann & Braun MB-series). The bacterial growth on Urea base agar, as well as colour changes, were checked after 7 days ...
    ... through a newly formed procedure that involved six steps from selection and identification, through kinetic study, to the characterization of the obtained precipitates, for the first time. To shorten the whole selection procedure of 43 bioagents with the MICP potential, Standard Score Analysis was performed ...

  • Sinteza i karakterizacija vanadata alkalnih metala sa elementima retkih zemalja

    Anđela Jovanović (2024)
    Predmet i cilj pisanja ovog rada su sinteza i karakterizacija vanadata alkalnih metala sa elementima retkih zemalja. Prilikom ovih istraživanja, ispitivan je sistem REE2O3–V2O5–KF, gde REE predstavlja trovalentni katjon izabranih elemenata retkih zemalja (Y, Sm, Eu, Gd, Er, Yb). Ovo istraživanje bazirano je na sintezi kristala, nakon čega su dobijeni kristali posmatrani pod binokularnom lupom, analizirani metodom rendgenske difrakcije na polikristalnom materijalu (XRPD) i metodom skenirajuće elektronske mikroskopije sa energetsko-disperzivnom spektroskopijom (SEM-EDS), kako bi se utvrdile karakteristike dobijenih kristala. ...
    elementi retkih zemalja, sinteza kristala metodom fluksa, vanadati alkalnih metala, rendgenska difrakcija, SEM-EDS metoda

  • Hidrodinamička analiza procesa starenja bunara sa horzontalnim drenovima na beogradskom izvorištu podzemnih voda

    Đorđije M. Božović (2023)
    Predmet istraživanja doktorske disertacije su bunari sa horizontalnim drenovima beogradskog izvorišta podzemnih voda, drugog najvećeg izvorišta ovog tipa na svetu, čiji je režim rada opterećen procesima intenzivnog starenja prisutnog od samog početka formiranja izvorišta, početkom 1950‒ih godina. Istraživanja sprovedena u okviru izrade disertacije su imala za cilj definisanje nove metodologije izučavanja procesa mehaničkog i biohemijskog kolmiranja drenova izradom detaljnih 3D numeričkih hidrodinamičkih modela, upotrebom postojećih, dostupnih i široko rasprostranjenih računarskih programa. Istraživanja su realizovana simulacijom ostvarenog režima podzemnih voda ...
    modeliranje podzemnih voda, hidrauličke karakteristike drenova, koeficijent propusnosti drenova, prifilterska zona drena, hidraulički otpori na drenovima, kolmiranje drenova, ulazne brzine podzemnih voda, MODFLOW, CLN Package
    ... 009 224 Zhan, H. Zlotnik, V.A., 2002. Groundwater flow to a horizontal or slanted well in an unconfined aquifer. Water Resources Research, 38 (7), 13-1‒13-11. DOI: 10.1029/2001WR000401 225 Zhan, H., 1999. Analytical study of capture time to a horizontal well. Journal of hydrology. 217 (1−2), 46−54 ...
    ... Doktorska disertacija USGS, Numbered Series. DOI: 10.3133/ofr02293 78 Hantush, M.S., Papadopulos I.S., 1962. Flow of ground water to collector wells. Journal of the Hydraulics Division, 88 (5). DOI: 10.1061/JYCEAJ.0000775 79 Hantush ...
    ... the Institute of Geology, USSR Academy of Sciences, Geology series, N 55. 192 Shoemaker, W.B., Kuniansky, E.L., Birk, S., Bauer, S., Swain, E.D., 2007. Documentation of a Conduit Flow Process (CFP) for MODFLOW‒2005. USGS Numbered Series, Techniques and Methods, 6-A24. DOI: 10.3133/tm6A24 193 ...

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • Транспортни систем за руду на површинском копу Бувач

    Никола Аџић (2024)
    У општем делу овог рада ће бити наведени утоварно-транспортни системи, њихова подела и основни елементи. У оквиру тога ће бити детаљније објашњени сви појединачни делови ових система као што су багери, камиони, дробилице и транспортери са траком. Даље ће бити наведени програмски пакети који се користе за прорачун ових система Talpac који се користи за прорачун дисконтинуалног транспорта и Helix који се користи за прорачун транспортера са траком. У специјалном делу су наведени параметри које мора да испуни пројектовани ...
    транспортни систем, камион, багер, транспортер са траком, дробилица
    ... Category Idler Description Carry Side Idlers Sandvik Carry Series 15 3 Roll Carry 127 Plain Return Side Idlers Sandvik Vee Return Vee Return Series 60 2 Roll Offset 178 Dia Idler Design Belt Width 1200 mm 71200 mm Idler Series 15 60 Drawing Number Nomirnal Idler Spacing 1.8 m 3.6 m ...
    ... pa Je 1010 m iH nocTaBJbeH je HOJI HarHOOM 0JI OKO 3.7* (rpaHcnopr py/te oxliı Kore 90 Ha KOJOJ ce Hana3uH npoOumuia JO KoTe 156 rane ce Hana3H yToBap Ha rpancnoprep TI). Marepujan ce MaJbe CralmMOHapHMM TpaHcmMŽoprepoM TI myxuHc 1660 m TpaHcnopryje o TocTpojeba 3a GMS. OpBaj TpaHcnopTep ce HaJta3H ...
    ... npakKanaaHa Je noroHcka craHurma TpaHcroprepa H MarHcTpajHu TpaHcroprep TI. 82 OcHOBHH TeXHHukKu nonanu TpaHcnoprepa 3a pyay T2 a TI nara cy y raOenu 7.2.1. Ta0ena 7.2.1. Ocnosnu mexnuuku no0auu mpancnopmepa 3a pyoy T2 u TI TPAHCIIOPTEP T2 Kananurer Q= 1200 m*/h JlyxxsaHa TpaHcnoprepa L = ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... over the time. Although the acquisition of the two types of knowledge is separated, the need for blending of academic and entrepreneurial knowledge has been recognized (Etzkowitz, 2004). Namely, students are exposed to practical knowledge during their studies, however usually to a modest extent ...
    ... monitoring in real time via an engagement dashboard.3 The EdX platform, recently (2012) conceived by MIT and Harvard University is aimed at supporting massive open online university courses. The platform has been developed as open-source software, akin to Moodle, and is available to other HEI under ...
    ... a learner may use, as opposed to the more traditional approach looking at one language at a time (Cenoz & Gorter, 2011). Hence, our approach envisages that learning materials within the TEL platform can be in various languages, thus providing an efficient answer to one of the major criticisms of ...

  • Aлтерације перидотита контролисане карактером флуида на примеру харцбургита Рудника - Серпентинизација или талкизација?

    Стефан Петровић, Наталија Батоћанин (2020)
    У раду су приказани резултати испитивања серпентинисаних харцбургита Брђана (43°58'45.1" СГШ, 20°25'12.6" ИГД) и талкизираних харцбургита откривених у интервалу 429-559.8 m у истражној бушотини 330А/18 (44°07'33.2" СГШ, 20°30'28.5" ИГД) на Руднику. Узорци оба локалитета показују карактеристике резидуалних харцбургита из омотача, односно тектонита; лепидобластичне, бластозрнасте, или порфирокластичне структуре и масивне текстуре. Серпентинисани харцбургити и серпентинити Брђана су изграђени од серпентина, ретких реликата оливина и ортопироксена, акцесорног спинела, и веома ретког секундарног магнезита и магнетита. Најдоминантнији састојак (местимично гради и преко ...
    Рудник, Брђани, харцбургити, серпентинити, талк
    ... low-temperature lizardite) to about 500ºC, when antigorite forms (MARTIN & FYFE, 1970; MOODY, 1976). It is commonly presented by the following reaction: Mg2SiO4 + MgSiO3 + 2H2O = Mg3Si2O5(OH)4 According to experimental data is forsterite stable up to 350-400°C and begins to convert into serpentine ...
    ... requires silica-rich fluids that were brought most probably by quartzlatite dykes and shallow intrusions. According to coexisting forsterite and talc, the temperature of fluids had to be at least 490°С. The elevated alumina content (>3 a.p.f.u.) in serpentine supports such statement. Are such talcized ...
    ... magnesite and magnetite, as well as the opaque accessories are subordinated. Talc is occasionally making up to 50 vol. % of rocks. Fibrous and fan-shaped talc are distributed in bands up to 8 mm thick, which alternate with bands of closely mingled olivine crystals (Fig. 3). Talc is almost of ideal ...

  • Geochemical study of U, Th and REE mineralizations in Jurassic sediments and hydrochemical characterization of groundwaters in Eastern Serbia – Case study: Plavna area

    Jovan Kovačević, Maja Todorović, Marina Ćuk, Petar Papić (2016)
    jurski sedimenti, uran, torijum, elementi retkih zemalja, podzemna voda, istočna Srbija

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... shades, from yellow to dark grey, due to differences in mineralogy (Milošević et al., 2019a). To obtain high-quality clay for pottery making, it is necessary to dig at a depth of >1.5-3.0 m and up to a depth of 8 m. Digging dee- per than 8m has been noted by the contractor to lead to a high probability ...
    ... (EDXS) to study the particle morphology and to assess the grain size. The grain-size distribution was determined using the pipette method according to the DIN ISO 11277 (2002). The Atterberg limits (plasticity index (PI), plastic limit (PL) and liquid limit (LL)) were determined according to the ...
    ... slightly larger amounts of Al,O; and Na»O are due to contamination by clay minerals during milling. The large CaO content is related to the abundant carbonates, which are also 150 -, sample CIMx 125 -| in te ns it y (c ou nt s) in te ns it y (c ou nt s) Fig. 2. XRPD traces of the ...

  • Primena digitalne fotogrametrije u rudniku Rudnik

    Nikola Mirković, Luka Crnogorac, Katarina Urošević (2023)
    Digitalna fotogrametrija, lasersko skeniranje i virtuelizacija sve više pronalaze aktivne uloge u rudarstvu, prvenstveno zbog svoje široke mogućnosti primene. Laserskim skeniranjem i fotogrametrijom snimaju se i kreiraju 3D modeli otkopa, jamskih hodnika, površinskih kopova, površinskih objekata (zgrada, spomenika, predmeta), a vrši se skeniranje celih rudnika koji se rekonstruišu u 3D digitalne modele. Fotogrametrija predstavlja proces fotografisanja objekata pomoću fotoaparata i daljom obradom fotografija u različitim softverskim alatima kreiraju se realne kopije 3D modela objekata ili predmeta u digitalnoj formi. Za ...
    digitalna fotogrametrija, prostorna vizuelizacija, rudarski objekti, podzemna eksploatacija
    ... Literatura [1] Torkan, M., Janiszewski, M., Uotinen, L., & Rinne, M. (2023). Method to obtain 3D point clouds of tunnels using smartphone LiIDAR and comparison to photogrammetry. In IOP Conference Series: Earth and Environmental Science (Vol. 1124, No. 1, p. 012016). IOP Publishing [2] Gligorić ...
    ... vremena, s obzirom na to da su podešavanja postavljana na kvalitetniju obradu i proces obrade podataka trajao je više sati. 113 Drugom modelu postavljeni su minimalni parametri. Razlog je prethodno iskustvo sa izradom prvog modocla, kao i broj slika koji je unet, pa je na osnovu toga za drugi model utrošeno ...
    ... lepili za bokove i vremenom ih prekrivali, takođe je došlo i do oksidacije s obzirom na to da su površine bokova hodnika slobodne i pod uticajem su vode i vazduha. Određeni uticaj na kvalitet kreiranih modela ima i to što su slike fotografisane sa dva telefona različitih karakteristika kamere (Tabela ...

  • Strukture kristala - odabrana poglavlja iz kristalografije i njena multidisciplinarnost

    Ljiljana Karanović (2024)
    Kristalografija

  • Multiword Expressions between the Corpus and the Lexicon: Universality, Idiosyncrasy and the Lexicon-Corpus Interface

    Verginica Barbu Mititelu, Voula Giouli, Kilian Evang, Daniel Zeman, Petya Osenova, Carole Tiberius, Simon Krek, Stella Markantonatou, Ivelina Stoyanova, Ranka Stankovic, Christian Chiarcos (2024)
    Predstavljamo trenutne aktivnosti na definisanju interfejsa leksikona i korpusa koji će služiti kao referenca u prikazu polileksemskih jedinica - višečlanih izraza - (različitih tipova - imenskih, glagolskih, itd.) u specijalizovanim leksikonima i povezivanju ovih unosa sa njihovim pojavljivanjima u korpusima. Konačni cilj je korišćenje ovakvih resursa za automatsko identifikovanje višečlanih izraza u tekstu. Uključivanje nekoliko prirodnih jezika ima za cilj univerzalnost rešenja koje nije usredsređeno na određeni jezik, kao i prilagođavanje idiosinkrazijama. Raspravljaju se izazovi u leksikografskom opisu višerečnih ...
    multiword expression lexicon, corpus, proof-of-concept lexicon encoding

  • Петрологија црвених пешчара источне Србијe

    Андреј Марковић (2024)
    У источној Србији формација црвених пешчара има велико распрострањење и улази у састав многих планина овог дела наше земље. Формацију чине кластичне стене интензивно црвене боје псамитске, ређе псамитско-псефитске структуре и алевритске структуре. Ове стене леже трансгресивно преко старијих пермо-карбонских и карбонских стена, док навише прелазе у доњотријаске седименте. Формација црвених пешчара захвата два појаса унутар Карпато-балканида – унутрашњи и средишњи део. Узорци анализирани у овом раду део су средишњег појаса. Тема завршног рада је петрологија црвених пешчара источне ...
    источна Србија, црвени пешчар, петролошко-минералошке карактеристике, аркозе
    ... and chemical analysis were applied. According to structural and petrological-mineralogical parameters, analyzed sandstones are defined as siltstone sandstones-arkoses. They are built of quartz, feldspar, rock fragments, micas and binders. According to size, degree of roundness and sorting, they ...
    ... savetovanja, 2, Ohrid, pp. 217-230. – Protić M. (1967): Sedimentological characteristics of the red Permian and the Lower Triassic (Buntstandstein) series in East Serbia. 8. Kongres Karpato-balkanske geološke asocijacije, 2, Beograd pp. 413-417. – lIporah, M. (1972): IlojaBe oOc3OojaBaĐa HICDMCKMX ...
    ... H TeMrepaTypH, ce ojpeljyje rexuHa JeyiHor IeHTHMeTpa KyOHOT CO, Koja ce MHOXKH Ca OpojeM HeHTHMeTapa KyOHHx, a JOOHJEHH IIDOH3BOJI CC JICHIH Ca TE)KHHOM HPpOOGOM H MHOXKH ca 100. OBHM HauHHOM Cec MOOHja mpomeHar CO> y mpoOuH KojH Kaja Cce TIIOMHO)KH Ca (baKTOpOM 2,273 nnaje rauaH rponeHar CaCOsy ...

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika

  • 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
    ... 0 m), created in the X-ray tube at 30mA and a voltage of 40kV. Sample record- ing was performed in the range of 2θ from 5 to 50° with a step of 0.02° and a retention time of 0.5s at each step. The data posi- tion of the diffraction peaks 2θ (°), the value of the flange dis- tance d (m), and the ...
    ... The R module according to PP (m – �y ash for month May; j – �y ash for month June; (s) – slag; NT – Nikola Tesla; KO – Kostolac). G eo lo g ia 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 ...
    ... 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 group, and slag from all three of these power plants also belongs to a silicate group. Percentage compositionof minerals in the samples of the ...

  • 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

  • Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites

    Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)
    To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...
    Perovskite/spinel ceramics, Multiferroic, Sintering, Influence of synthesis method