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337 items

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... d=739.73m. The total of 54 points is designed in those chambers; those points are to represent the future mine continuing series of levels, and they need to be set out while carrying out mining works. Mine traverse is to include 54 traverse legs, or levelling distances with average length of 13.70m ...
    ... least resistance line at the same time. The transport and hauling of the ore is realized by the diesel-powered loading-hauling and dump (LHD) equipment and pit truck. The loading and transport of the blasted ore from the stope to the appropriate loading place to the pit truck is real- ized by the ...
    ... chambers designed within the vertical plane is to be carried out by using trigonometric leveling of reference points by means of vertical angle (zenith distance). The reference points representing traverse points are to represent, at the same time, leveling points (benchmarks) of the future mine ...

  • Одређивање оптималне производње дубинске пумпе на клипним шипкама

    Небојша Савић (2024)
    Дужи временски период током историје производње нафте, дубинске пумпе на клипним шипкама су први и у многим случајевима једини избор када су у питању механичке методе експлоатације. Правилан одабир сваког појединачног елемента система омогућава оптимизацију која са собом повлачи бенефите у виду повећавања ефикасности и смањења трошкова. Тренутно примењени систем дубинских пумпи на клипним шипкама на лежишту „Н“ обезбеђује стабилну производњу и реализацију годишњих планова производње без већих проблема. У овом раду је приказан начин оптимизације производње дубинским пумпама ...
    дубинска пумпа, оптимизација, производња, потисни вентил
    ... 3aTBapaMbbe H OTBapaM= BeHTHJa. Ta moTpeOHa 3aHmpeMHHa cc TIOCTH)KC JEČHMHO KpO3 HOBchaHO KpeTaMbe Kpo3 IMMJIHHap. PanHH IMMKJIyC je ripHKa3aH Ha c 2.2. – P Cnuka 2.2 IIpuka3 ekcnaH3uje, ycucHo2 Juk/IyapMnpecuje u nomucHoo UJUKJIyCa ( Schlumberger/The Defining Series: Rod Pump Systems, URHEps://www ...
    ... 2015. The Beam Lift Handbook, The University of Texas, Austin 5. Schlumberger/rIhe · „Defining Series: Rod Pump Systems, URL: https://www.slb.com/resource-library/oilfield-review/defining-series/defining- rodpumps (08.04.2024.) 6. West, lan M., 2019. Petroleum geology of the south of England ...
    ... mjaMa 3 CJICMCHT4a IIYyMIIC: 1. V onHocy Ha TO Jta JIH Je IIyMIa HHCepT HJIH TyOHHT 2. V ojnHocy Ha TO Jla JIH IIyMITa HMa CTaHIHOHapHH (HeIIOKpeTaH) HJIH IIOKpeTaH TUHJIHH/IAp H KOJH THTI IIHJIHH/Ipa H Ki1mima cy yrpaljeHu 3. V onHocy Ha TO Jla H je IIyMIma ycCeJlHyTa y TOpEbeM HJIH JIOĐĆM ...

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area

    Filip Anđelković, Dejan Radivojević (2018)
    baden, Beograd, facije, facijalna raznovrsnost, sedimenti
    ... and  sands  (type  locality  is  in  Rakovica  stream).  The  conglomerates  contain  numerous  Ostrea  shells  and  represent  a  basal  series.  According to Anđelković M. and Anđelković J., they mark the second Badenian transgression.    CONCLUSION    Because of  its facial diversity, the Belgr ...
    ... cycles:  lower and upper. According  to  their understanding of  the problem,  the  facies of Tašmajdan limestones and Rakovica sands, which are in the focus of this paper, belong to the  upper cycle, and the facies of Višnjica clays and Konjarnik schlier belong to the lower cycle.   Based on their  ...
    ...  and palaeontological traits characteristic to two subfacies or facies.  The facies which has been formerly named „Rakovica sands“ could be renamed „Rakovica clastic  sediments“ (according to the terminology of Anđelković M. & Anđelković J., (1997)).  To conclude, all of these facies could be viewed  ...

  • English for Geology Students. 1

    Lidija Beko (2023)
    Engleski jezik
    ... biosphere, the study of palaeomineralogy allows us to see Geological Wonders The Naica Caves, Chihuahua, Mexico A series of astonishing caves containing crystal formations have been discovered by miners in the Naica Mine in Mexico. The first to be explored was the Cave of Swords, which was discovered ...
    ... the water is thought to account for the formation of the crystals. Ateam ofscientists have discovered imperfections or inclusions within some of the crystals, the liquids in which contain bacteria which may be up to 50,000 years old. The scientists claim to have been able to reactivate these lifeforms ...
    ... lifeforms. The Cave of the Crystals was only accessible due to the pumping equipment used by the mining company. In 2015, the Cave was allowed to flood when mining operations cease and so the crystals may once again begin to grow! ___ Using the web pages below, and any others you can find, write ...

  • Hydrogeochemical distribution of Ca and Mg in groundwater in Serbia

    Petar Papić, Jovana Milosavljević, Marina Ćuk, Rastko Petrović (2014)

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... solution was added to each glass, and heated for another three hours with occasional stirring. Suspensions were then left to cool. After being transferred to the initial bottles, to each suspension was added 100 mL of 3.2 mol L-1 ammonia acetate and filled up with bidistilled water up to 500 mL. Suspensions ...
    ... determined in the equation of the line, according to the equation (3). Also, the sorption capacity or elimination efficiency was determined as well and which represents the ability of soil to bind to itself a certain quantity of metallic ion until there comes to its saturation. Sorption capacity is represented ...
    ... phases were filtered into 250 mL volumetric flask and were filled up to the line. The sediment was rinsed with bidistilled water up to negative reaction to ammonia ion and returned to the initial bottles. Phase II: in each bottle containing soils from phase I was added 100 mL of 0.2 mol L-1 hydroxylamine ...

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... towards the SSW (dip direction ~210–235°) at an angle of 40 to 50°. Varia- tions of the dip directions of bedding planes and their dip angles are due to the deformed state of the whole unit. Deformational fabrics are composed of a series of cleavages which significantly disrupt the primary sedimentary ...
    ... 3). 3.1. Unit A (interval: 0 to 2.10 m of the column) Stratigraphically the lowest unit (A) of the succession is exposed in the NE side of the quarry and is composed of a series of nor- mally graded turbidites (Fig. 4). Their lower parts are composed of fine- to medium-grained sandstones which ...
    ... correspond to facies S4 (graded siltstones and mud- stones) or in some cases the possible background deposition of pelagic sediments. Compared to the proposed model (ZAVALA & PAN, 2018), the observed vertical association of different fa- cies within units A and D is interpreted as a series of hyperpyc- ...

  • Избор одговарајуће механичке методе

    Анастасија Мирјанић (2024)
    Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... The Serbian Language in the Digital Age. META-NET White Paper Series. Springer, Heidelberg (2012). https://doi.org/10.1007/978-3-642-30755-3. Rehm, G., Uszkoreit, H. (Series eds.) 18. Krstev, C., Vitas, D., Stanković, R.: A lexical approach to acronyms and their definitions. In: Mariani, Z.V.J. (ed.) ...
    ... natural languages at the same time. One of the open research questions in the keyword extraction task is to develop a method that is general enough for keyword extraction in several lan- guages simultaneously. Therefore, we focus on a method that can be easily ported to a new language. The prerequisites ...
    ... from par- allel texts of different languages with bilingual keyword annotations. To the best of our knowledge, this will present a graph-based keyword extraction for parallel abstracts in scientific articles for the first time, as well as a new bilingual keyword extraction dataset. The main contributions ...

  • Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia)

    Nikita Bragin, Nevenka Đerić (2020)
    Radiolaria, Dinarides, Jurassic, stratigraphy, Serbia
    ... (PESSAGNO & WHALEN), Mizukidella sp., Hsuum sp., Tran- shsuum sp., Theocapsomella sp. Due to the presence of Takemu- raella weghae the assemblage is compatible with UAZs 3 to 6, covering the time span from the Bajocian to the Bathonian. As some taxa were determined in open nomenclature and their data adequacy ...
    ... stratigraphic scheme for the Triassic and Jurassic of the Inner Di­ narides. Numerous stratigraphic series (formations) were ana­ lyzed: some of them were revised, others were established for the first time. Radiolarite formations in this scheme are most com­ mon in the Middle and Upper Jurassic deposits ...
    ... from the fore­reef. On the basis of our new data the analyzed radiolarites (the lower part of Ljubiš Formation) were deposited in the time period of the Bajocian to the Bathonian. The Ljubiš Formation above our samples contains reworked Middle Jurassic Bositra limestone clasts (GAWLICK et al., 2017) ...

  • Results of Recent Monitoring Activities on Landslide Umka, Belgrade, Serbia—IPL 181

    Biljana Abolmasov, Uroš Đurić, Jovan Popović, Marko Pejić, Mileva Samardžić Petrović, Nenad Brodić (2021)
    Klizišta, Monitoring, GNSS, Geodetska osmatranja, UAV snimci, PSInSAR
    ... Interferometric techniques named Persistent Scatter Inter- ferometric Synthetic Aperture Radar (PSInSAR) have been developed and designed to generate time-series of ground deformations of individual coherent radar targets-Permanent Scatterers (PS). PSInSAR signal analysis allows estimating displacement ...
    ... 8–139.1 mm) close to local secondary scarps. Taking into account time span between two survey sequences (eight months), displacement vectors rates were in line with obtained GNSS2 object point monitoring results for the same period. UAV photogrammetric survey analysis from two series of imaging (2018 ...
    ... were: (1) to increase the number of surface monitoring points, (2) to test accuracy of existing and newly introduced monitoring techniques and (3) to compare monitoring data obtained from different techniques within same time span. Common to all implemented moni- toring techniques is to measure ...

  • 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
    ... exposure to air for t > 10 min, a surface crystalline oxide layer is formed. The surface oxide layer is epitaxial, with interplanar distances enlarged by 3.5%in (100) compared to the bulk arsenopyrite structure. The formation of oxides can be avoided by very short sample handling time on air (<5 ...
    ... 769(2) 111.84(2) 174.8(1) 1.63138(6) 32.748(1) 03 %02' ŠbS Ni, Drenjak TI-1 5.749(3) 5.684(3) 5.781(3) 112.13(2) 175.0(1) 1.63209(6) 33.363(1) 0.3Co TI-2 5.741(5) 5.679(5) 5.768(4) 112.25(1) 174.2(2) 1.6315(2) 32.861(3) / TI-6 5.743(2) 5.670(2) 5.772(2) 111.82(2) 174.5(1) 1.63071(3) 32.1674(6) / ...
    ... large homogeneous grain, 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 ...

  • 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

  • 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

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... Biostratigraphically, the section belongs to the “Lower Pontian”, sensu STEVANOVIĆ i.e. it corresponds to the Upper Pannonian Congeria praerhomboidea Zone i.e. a time interval between 8–9 Ma (MAGYAR & GEARY, 2012). Nevertheless, the aforementioned outcrop belongs to the littoral facies of Lake Pannon ...
    ... Torlak block from the Pliocene to recent time. According to DJOKOVIĆ & MAROVIĆ (1990) and TOLJIĆ (2006, 2016) and the documented structural measurements of different Mesozoic units in the study area, the Zavojnička Reka is controlled by the local fault system with its N-NW to S-SE direction. After the ...
    ... pinkish to greenish sandstones and reddish clays which together build a heterogeneous series (Fig.3b-d). Macroscopi- cally, they are barren of fossils. STEVANOVIĆ (1970) believed that these conglomerates represent a special stratigraphic horizon at the transition from the “Helvetian to Tortonian ...

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic