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879 items

  • Attenuation of bacteriological contaminants in karstic siphons and relative barrier purifiers – Case examples from Carpathian karst in Serbia

    Vasić Ljiljana, Stevanović Zoran, Milanović Saša, Petrović B (2015)

  • Heavy metals and trace element accumulation and distribution in the organs of Phragmites australis (Cav.) Trin. eh Steud. 1841, Tisza River, Srebia

    Štrbac Snežana, Jovančićević Branimir, Šajnović Aleksandra, Simonović Predrag, Dojčinović B., Grubin Kašanin Milica, Vasić Nebojša, Srdić D. (2012)

  • Karst aquifer average catchment area assessment through monthly water balance equation with limited meteorological data set: Application to Grza spring in Eastern Serbia

    Ristić-Vakanjac Vesna, Prohaska Sevan, Polomčić Dušan, Blagojević B., Vakanjac Boris (2013)

  • Magnetization enhancement in nanostructured random type MgFe 2O4 spinel prepared by soft mechanochemical route

    Antić Bratislav, Jović Nataša, Pavlović Miodrag B., Kremenović Aleksandar, Manojlović Dragan, Vučinić-Vasić Milica, Nikolić Aleksandar S. (2010)

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • Fenton-like oxidation of an azo dye using mesoporous Fe/TiO2 catalysts prepared by a microwave-assisted hydrothermal process

    Nešic Jelena, Manojlović Dragan D, Jović Milica S, Dojčinović Biljana P, Vulić Predrag, Krstić Jugoslav B, Roglić Goran M (2014)

  • Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe) 3-deltaO 4 nanoparticles

    Antić Bratislav, Kremenović Aleksandar, Jović Nataša, Pavlović Miodrag B., Jovalekić Čedomir, Nikolić Aleksandar S., Goya Gerardo F, Weidenthaler Claudia (2012)

  • Attenuation of Bacteriological Contaminants in Karstic Siphons and Relative Barrier Purifiers: Case Examples from Carpathian Karst in Serbia

    L. Vasić, Z. Stevanović, S. Milanović, B. Petrović (2015)

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... corresponded to single-crystal arsenopyrite and was indexed according to the structure data reported in [9] (Figure 3c). Figure 3. (a) Overview TEM micrograph of arsenopyrite (Apy) singlle crystal; arrows mark planar defects parallel to (010) plane; circle marks the SAED position. (b) HR-TEM of the ...
    ... forbidden hk0 reflections (space-group absences) observed in the experimental SAED (Figure 4a) to occur due to twinning [10]. Figure 4. (a) SAED pattern indexed for arsenopyrite, with the corresponding, (b) CBED pattern showing Kikuchi lines. (c) Simulated SAED and CBED (threshold 55%, intensity factor ...
    ... and crystallinity of the natural oxide layer formed upon exposure to air. Adriatic sea 100 km iii ==t-Macedorian Massi E v.arzone Pelagonian Zone BIŠaBP Rnodope complex [0 carpatho-Balkanides [7\ | Moesian Platform B l a c k s e a E===== 50 km Ć . [E osstal units of Adria [ ...

  • Using Lexical Resources for Irony and Sarcasm Classification

    Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković (2017)
    The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...
    ... si ružan da te ni promaja ne bi udarila ‘you are so ugly that even the draught wouldn’t hit you’. 5.2 The application of the irony classifier to sarcasm A thin line divides ironic utterances from sarcastic ones. There are many definitions and comparisons of these two figures. According to one of themost ...
    ... which amounted to a total of 1,903 tweets. In the last step, we have made corrections to the set of tweets obtained in this way. In tweets in Serbian (and other related languages) two types of mistakes appear systemically: (a) authors of tweets do not always use diacritic signs; (b) authors do not use ...
    ... ontology related to the existence of ironic pairs in which the six previously mentioned relations par- ticipate and which can be used for generating “synonyms” of one member of the relation of direct antonymy are depicted here in the form of Jena rules:9 "[rule1: (?a swn:synonym ?b) (?b near_antonym: ...

  • Geotehnički aspekti izgradnje visećeg pešačkog mosta u Starom gradu u Užicu

    Zoran Berisavljević, Miloš Marjanović, Uroš Đurić (2023.)
    U radu su prikazani rezultati geotehničkih istraživanja za potrebe izgradnje visećeg pešačkog mosta preko klisure reke Đetinje u Užicu. Predviđeno je da most, sistema prednapregnute trake, omogući prelaz pešacima sa desne dolinske strane na stranu Starog grada, koja je opasana strmom liticom (cca. 40 m visine). Za potrebe formiranja geotehničkog modela i strukturnog sklopa krečnjačke stenske mase korišćen je postupak fotogrametrijskog snimanja dronom. Predviđeno je da se zatežuća sila (od oko 30 MN), koju most prenosi na obalni stub, ...
    fotogrametrija, stabilnost kosina, pukotine, prednapregnuta sidra, test granične nosivosti, paker (Ližonov) test
    ... redukcije čvrstoće (SSR), slika 8b. 90 to 83 degrees: 83to 79 degrees: 7oto 71 degrees: 71to 67 degrees: 67 to -19 degrees: -19 to -22 degrees: -22 to -90 degrees: || J u| "| u| " |a | Slika 8. Rezultati proračuna stabilnosti a) faktor sigurnosti prema MKE, b) pomeranja u zoni stuba, c) faktor ...
    ... bara. Ispitivanje je izvršeno na tri izolovane dužine u bušotinama B-I i B-2 i to u zonama gde će se nalaziti sidrišna deonica prednapregnutih geotehničkih sidara. Intervali (etaže) na kojima je vršeno ispitivanje su 5 m dužine, ı to: 10 - 15 m, 15 - 20 m ı 20 - 25 m. Ciklusi ispitivanja u bušotini ...
    ... BI su izvedeni u 5 faza (pri čemu je svaka trajala od 5 do 12 min, tJ. do ustaljenja protoka), i to sledećim redosledom:0 -2-4-6-4 – 2 bar. Ciklusi ispitivanja u bušotni B-2 izvedceni su u 3 faze ı to sledećim redosledom: 0 -2-3-2 bar. U zavisnosti od izgleda dijagrama mogu se doneti određeni zaključci ...

  • Geotechnical Conditions for Construction of Savski Trg Metro Station as a Part of the Belgrade Metro Line One

    Nemanja Stanic, Dragoslav Rakic, Josip Isek, Slavoljub Simic (2024)
    In order to solve serious traffic congestion in Belgrade, a number of studies regarding the Belgrade Metro construction have been carried out since 1973. However, only in 2019, the routes of the future metro lines 1 and 2 were de-fined as a part of the General Metro Construction Project. The lines are de-signed to intersect at the location of Sava Square, where an interchange met-ro station will be built. It represents a complex geotechnical structure consist-ing of three different ...
    metro station, geotechnical modelling, displacements

  • Uticaj geološke neizvesnosti u razvoju rudarskih projekata

    Petar Marković, Dejan Stevanović, Mirjana Banković (2023)
    Rudarstvo je industrija koja se nosi sa različitim vrstama neizvesnosti i rizika zbog svoje prirode i specifičnosti. Neizvesnost u rudarstvu može poticati iz različitih izvora i uticati na različite aspekte rudarskih projekata. Kao jedan od dominantnih faktora, ističe se geološka neizvesnost. Geološka neizvesnost igra ključnu ulogu u rudarstvu i može značajno uticati na procenu resursa i rezervi, planiranje eksploatacije, ekonomsku isplativost i upravljanje rizicima. Ova neizvesnost se ne može eliminisati, ali se uz primenu adekvatnih standarda i zakona može ...
    ... blokovima je umanjen za 15%, 30% i 50% u zavisnosti od toga da li se radi o A, B ili CI kategoriji rezervi). • Pozitivna greška u proceni sadržaja (sadržaj u rudnim blokovima je povećan za 15%, 30% i 50% u zavisnosti od toga da li se radi o A, B ili C1 kategoriji rezervi). Na ovaj način, analizom ...
    ... rezervi Kategorija Dozvoljena greška % Verovatnoća % A +15 85 B +30 70 Cı +50 50 Kategorije rezervi su na ovaj način poređane prema pouzdnanosti, pri čemu udeo bilansnih rezervi kategorija A i B, mora biti najmanje 60%, a od toga rezerve A kategorije ne mogu biti manje od 10% (Pravilnika o k ...
    ... karbonatne rude (48%) je svrstan u B kategoriju. U B kategoriju su uvršteni delovi rudnog tijela koji su okontureni na osnovu istražnih bušotina u kvadratnoj mreži sa udaljenošću bušotina do 75 m (izvedena istražna mreža je ~ 70.5*70.5 m) i po dijagonali ove mreže. Na B kategoriju, do isklinjavanja rudnog ...

  • Mehanizam nastanka bjelasičke klipe u internim Dinaridima severne Crne Gore

    Katarina Stefanović (2024)
    Bjelasička klipa predstavlja segment Internih Dinarida na području severne Crne Gore. Područje obuhvata tektonski kontakt Drinsko-ivanjičke jedinice i Istočnobosansko-durmitorske jedinice, pri čemu se na širem području nalaze i jedinice Prekarst i Zona bosanskog fliša. Tektonska klipa Drinsko-ivanjičke jedinice, odnosno bjelasička klipa, kao i generalna tektonska evolucija područja u kom se ona nalazi, nisu izučeni u adekvatnoj meri. Stoga je cilj ovog rada pribavljanje novih podataka o tektonskoj evoluciji bjelasičke klipe, koji mogu biti značajan prilog za bolje poznavanje geodinamičke ...
    Interni Dinaridi, paleonaponska analiza, bi-direkciona ekstenzija, rased Skadar-Peć, dekstralno smicanje
    ... . Odnosi sa rasedima kredno-paleocenske kompresije su prethodno prikazivani u okviru opisa deformacione faze vezane za te starije rasede (Slika 6.6 b). Na osnovu svih tih superpozicionih odnosa, datih primerima, zaključeno je da su ovo najmlađe geološke strukture u području, izrazito strmog pada ...
    ... owWz345ST789 a O K Te dE av Wit TE TOOO _— StemAmt Av.Umc Ic Datald Compiled dote SubsetIndex Optmrsatoon Results (Resolved stress) Comments Kınemntc axes Mopi [[ Trpe|Plane |une _|Senselci|wt TAct[Se |inputTmp|workng|Snear |SenselAupha |p Ju-DistNmag|Tmag| F5___ype| pind|pAom |b ind|b Aom |tinc Jtazim ...
    ... iznosi 51*, na osnovu toga se nabor klasifikuje kao blag. Equal Arca S D,ss Trijas s ? (Schmidt) (Schmidt) b JAxial Axial Equal Arca s (Sc Axial N=3 Slika 6.2 — a)Konturni dijagrama slojevitosti sedimenata donjeg i srednjeg trijasa Drinsko-ivanjičke Jedinice; b)Statistički rekonstruisani ...

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... Spring, thermal spring, and borehole B-1). Sustainability 2023, 15, 11146 4of14 Karstification bl,depih Thermal spring Borehole B-1 Figure 3. Krupaja system phenomena (Krupaja Spring, thermal spring, and borehole B-1). Borehole B-1 log according, to video-endoscopy, thermal logging, and ...
    ... surface water, but water that has had a long residence time within the system, lowering the stable carbon isotope content by up to —5.32%o. Table 2. Stable isotope groundwater content results from the Krupaja Spring, Thermal spring, and Borehole B-1. Location &DCp;c(V-PDB) % &D(V-SMOW) % &1O(V-SMOW) ...
    ... May 2014. Other samples fall close to the local isotope meteoric line, indicating, a connection with atmospheric water, but also lie below the LIML, having a higher groundwater mean residence time and therefore indicating, secondary fractionation. Borehole B-1 reflects much of the content of a ...

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... result Z to move to the ESP standard, the changes of input parameters are to the extent of 10% under the indicators A and C, while the parameter changes under indicator B are 25%. In the case where Z moves to the SRP standard, it is necessary to measure from −20% of the parameters under indicator B, while ...
    ... respectively B1 to B6 in B, and C1 to C5 in C. At the second level of synthesis, A, B and C parameters are synthesized into the M (Figure 4).Energies 2020, 13, x 9 of 15 Figure 4. Hierarchical structure of fuzzy composition. Partial indicators of optimal method of selection, A, B and C, are presented ...
    ... changes of input parameters are to the extent of 10% under the indicators A and C, while the parameter changes under indicator B are 25%. In the case where Z moves to the SRP standard, it is necessary to measure from −20% of the parameters under indicator B, while the remaining parameters remain unchanged ...

  • Neogena i kvartarna herpetofauna (Anura i Squamata) Srbije : doktorska disertacija

    Dragana D. Đurić (2019)
    U radu je prvi put opisan deo herpetofaune (Anura i Squamata) iz neogenih i kvartarnih lokaliteta Srbije. Obrađeni su lokaliteti Sibnica, Prebreza, Lazarevc, Vračević i Riđake, neogene starosti. Lokaliteti kvartarne starosti su pećine Mala i Velika Balanica, Pešturina, Hadži Prodanova, Baranica, Vrelska pećina i sedimentne ispune fisura u kamenolomima Venčac i Beočin. U radu je prikazana je taksonomska analiza herpetoloških ostataka. Pored taksonomske analize fosilnog materijala dat je kratak geografsko-geološki opis proučavanih lokaliteta, osnovne osteološke karakteristike anura i skvamata ...
    paleoherpetofauna, Anura, Squamata, kvartar, pleistocen, neogen, Srbija, paleoekologija, paleoklima
    ... b) Sl. 21. Mala Balanica, plan iskopavanja (a), severni profil (b); iz Mihailović 2009, modifikovano. Slojevi 2a-2c Male Balanice i 3a-3c Velike Balanice pokazuju veliku sličnost, te se smatra da su nataloženi u približno ...
    ... Zbog svojih malih dimenzija ovaj fosilni materijal se lako transportuje i time oštećuje. Ova oštećenja, naročito na pršljenovima, često zahvataju krhke koštane nastavke koji su vrlo često i dobri taksonomski karakteri, te se na taj način proces identifikacije i determinacije znatno otežava. Oštećenja o ...
    ... sloj dobijeno više različitih starosti, od 95 do čak 115 ka, to bi starost mogla da bude i MIS5c (Blackwell et al. 2014; Mihailović 2014). a) b) Sl. 22. Pećina Pešturina: a) plan iskopavanja, b) severni profil sonde u liniji M9a-M12a (iz Mihailović & ...

  • Palinomorfe sa lokaliteta Gostuška reka (Stara planina)

    Ivan Rutović (2024)
    U radu su prikazani rezultati palinološkog istraživanja permsko-trijaskih sedimenata sa lokaliteta Gostuška reka. Palinološki kompleksi su detaljno analizirani, što je omogućilo morfološku, taksonomsku i paleoekološku identifikaciju palinomorfi. Istraživanje je pokazalo prisustvo velikog broja spora i polena golosemenica, dok je polen skrivenosemenica zastupljen u manjem procentu. Na osnovu paleoekoloških analiza, zaključeno je da je tokom formiranja sedimenata na lokalitetu vladala aridna klima, sa povremenim vlažnim fazama koje su omogućavale razvoj močvarne vegetacije.
    palinomorfe, paleoekologija, perm - trijas, Stara planina, Gostuška reka
    ... (00)00076-2 4nđelković J., Krstić B., Bogdanović P., Jadranin D., Milenković P., Milošaković R., Fotić P., i Jovanović LJ., 1969: Osnovna geološka karta SFRJ – Pirot 1:100 000. Beograd: Zavod za geološke i geofizička istraživanja. 4Anđelković J., Krstić B., Bogdanović P., Jadranin D., Milenković ...
    ... sporae dispersae des neiderrheinischen Zechsteins. — Fortschr. Geol. Rheinid. U. Westf, Krefeld, str. 6 — 24. Tvančević B., Savić S., Sabovljević M., Niketić M., Zlatković B., Tomović G., Lakušić D., Ranđelović ., Ćetković 4., Pavićević D., Krpo–Četković J., Crnobrnja-Isailović J., Puzović S. ...
    ... rpepanta (CC BY-NC-ND) AyTOpcTBO — HEKOMePIHJaJIHO — J(eJ1HTH IIOJ{ HCTHM yCJ1OBHMa (CC BY-NC-SA) Ayropcrno — 06e ripepajta (CC BY-ND) . i B O B | AyTOpcTBO — J(eJIHTH ITOJ( HCTHM ycJ1OBHMa (CC BY-SA) (Qaokpyotcume cao jeOHy oO wecm nonybenux nuujenHuyu. Kpamak onuc utyeniyu je cacmasenu ...

  • Microscopical characterization of carbon materials derived from coal and petroleum and their interaction phenomena on making steel electrodes, anodes and cathodes blocks

    Predeanu G., Panaitescu C., Balanescu M., Bieg G., Gómez Borrego A., Diez M.A., Kwiecińska B., Marques M., Mastalerz M., Misz-Kennan M., Pusz S., Suárez Ruiz I., Rodriguez S., Singh A.K., Varma A., Zdravkov A., Životić Dragana (2013)