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Упит dcterms_subject_txt:COVID 19

685 items

  • Strukture kristala - odabrana poglavlja iz kristalografije i njena multidisciplinarnost

    Ljiljana Karanović (2024)
    Kristalografija

  • Proračun osnovnih mehanizama na rotornom bageru ShRs 1300 na PK Polje E

    Luka Nikolić (2024)
    Površinska eksoloatacija ležišta mineralnih sirovina, a posebno uglja (lignita) vrši se primenom različitih rudarskih mašina. U zavisnosti od tipa ležišta, rudarsko-geoloških uslova, ekonomske analize i sl. koriste se sistemi sa kontinualnim ili diskontinualnim načinom rada.Kod kontinualnih sistema, primenjuju se kompleksne rudarske mašine kod kojih se proces odvija neprekidno odnosno bez ciklusa utovara, transporta i odlaganja i najčešće rade u sve tri smene. Rotorni bageri i bageri vedričari, transporteri sa gumenom trakom, odlagači ili deponijske mašine čine tkz BTO ili ...
    rudarstvo, rotorni bager, ugalj, ShRs 1300
    ... aaaeaaaakivk 18 3.3. Osnovne komponente rotornog bagera......aaaaaaaaaa a aaaeaeaaaaeaaaaaaaaaaaeaatakivk 19 3.3.1. Čelična konstrukcija..aaaaaaaaaaa diii atinNNaiataeattiakkattiakaatn 19 3.3.2. Donja gradnja i transportni mehanizam ... 3.3.3. Uređaj za transport bagera......aaaaaaaaa a aaea ...
    ... Измењено: 2024-07-22 07:12:19 Proračun osnovnih mehanizama na rotornom bageru ShRs 1300 na PK Polje E Luka Nikolić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Proračun osnovnih mehanizama na rotornom bageru ShRs 1300 na PK ...
    ... Rudarsko-geološki fakultet Završni rad Proračun osnovnih mehanizama na rotornom bageru ShRs 1300 na PK Polje E Kandidat: Mentor: Luka Nikolić R85-19 Prof.dr. Dragan Ignjatović U Beogradu, jul 2024. Komisija: 1. prof. dr Dragan Ignjatović, mentor Univerzitet u Beogradu, Rudarsko-geološki fakultet ...

  • Phase and microstructural study of urinary stones

    Miljana Mirković, Anja Dosen, Suzana Erić, Predrag Vulić, Branko Matović, Aleksandra Rosić (2019)
    In this paper we present the phase and morphological characteristics of urinary stones from Serbian patients. The study included for the first time the determination of the phase composition and a statistical analysis of the presence of different types of urinary stones in both men and women in Serbia. The main goal of study was representation of collected data for the first time. For past three years, more than 600 samples were collected from Serbian patients. The phase composition ...
    бубрежно камење, фазни састав, статистика, рендгенска дифракција праха, скенирајућа електронска микроскопија

  • Filling of dolines with aeolian sediments in the high-mountain karst of the Dinarides (Mt. Durmitor, Montenegro)

    Mirela Djurović, Violeta Gajić, Predrag Djurović (2022)
    Filling of dolines with aeolian sediments, one of the less frequently described ways in which they are filled, is analysed in the present study on an example of a doline in the high-mountain karst of the Dinarides. There is a series of deep dolines on a broad ridge (about 2450 m a.s.l.) on Mt. Durmitor (Montenegro) in the southeastern part of the Dinarides. The accumulation of very fine-grained sand that almost completely fills one of the dolines was analysed. ...
    Doline, Zapuna, Eolski sedimenti, Karst, Dinaridi, Crna Gora

  • Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example

    Miloš Marjanović, Biljana Abolmasov, Igor Peshevski, James Reeves, Irena Georgievska (2020)

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе
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    ... ��������� ., ����›���� �., (2017). ������� AHP � WoE ������ � ������� �������� �� ������ �� ›��� �� �������� ������� ������. �������� 7�10: 239�246. [19] Abolmasov B. (2016). Landslide Risk Management Study in Bosnia and H UNDP Bosnia and Herzegovina, Sarajevo, BiH. pp 82. http://www.ba.un [20] Andrejev ...

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • Израда хидрогеолошких објеката за потребе захватања подземних вода из алувијона Саве на локацији Мајур (Шабац)

    Лука Обрадовић (2024)
    За потребе формирања изворишта за водоснабдевање фабрике у селу Мајур (град Шабац) технолошком, техничком, санитарном и водом за потребе противпожарне заштите,спроведена су примењена хидрогеолошка истраживања која су обухватила израду две истражне бушотине ЗКИБ-1 и ЗКИБ-2 ,директном методом бушења, са уградњом пијезометарске конструкције и израду једног истражно-експлоатационог бунара. Бунар је израђен реверсном методом бушења уз примену чисте воде као радног флуида.Пројектовани бунар је дубине 30 метара чији капацитет износи 32,67 l/s. Захвата подземне воде формиране у овкиру алувијаних слојева реке ...
    израда бунара, истражно бушење, хидрогеолошка истраживања, Мајур
    ... IIpBa cHcTeMaTcKa recojimomiKa HcTpaxXHBaMba Ha OBOM TOJIipyujy 3anoueTa cy KpajeM 19. BeKa H OJL TaHa Cy CC HCHPpeKHJHO HacTaBJbama, mpHmaroDaBajyhH Cc HOBHM MeTOJIOJIOrHJaMa H HayuHHM Ca3HaMbHMa. Kpaj 19. BeKa H noueTak 20. BeKka • 1890. romiHa: Jypamuh nerajbHo aHanuyupa rnnurKe OyHape ...
    ... yKynHe nyx)xkHMHc 19 Merapa, op +1,0 no 18,0 Merapa. 62 IInjeaoMerap II-2: • „TanoOx)KHHK JUy)KHMHC l MeTap y HHTepBa:ijyy oJ 21,0 no 22,0 erapa; • „(OnrTepcKa KOHCTpyKHJa, CJIOTHpaHa Ca CHTOM H HaBOJeM, JUy)KHHC 3 MeTpa on 18,0 no 21,0 erapa; • IHIyHa meB yKynHe nyx)xkHMHc 19 Merapa, op +1 ...
    ... 21,8 22,5 48 13, 37 -33 11,4 2002 -I,I 6,3 837 1, 188 21,2 22, 21,3 6,1 12 9,2 0,8 · 12,3 2003 · -1l,ć -3,8 5,7 1l,1 20,1 23,5 22 23,5 63 9,9 7,4 19 11,3 2004 · -14 2,2 6,2 2, 152 19,5 21,6 20,7 154 13, · 6, 27 112 2005 0 29 44 1I 69 192 21,5 19,7 73 116 4,9 2, 10,5 2006 -l,4 0,9 5,6 2, 164 ...

  • Neanderthal Settlement of the Central Balkans during MIS 5: Evidence from Pešturina Cave, Serbia

    Dušan Mihailović, Stefan Milošević, Bonnie A.B. Blackwell, Norbert Mercier, Susan M. Mentzer, Christopher E. Miller, Mike W. Morley, Katarina Bogićević, Dragana Đurić, Jelena Marković, Bojana Mihailović, Sofija Dragosavac, Senka Plavšić, Anne R. Skinner, Iffath I.C. Chaity, Yiwen E.W. Huang, Seimi Chu, Draženko Nenadić, Predrag Radović, Joshua Lindal, Mirjana Roksandić (2022)
    Recent research in the southern Central Balkans has resulted in the discovery of the first Middle Paleolithic sites in this region. Systematic excavations of Velika and Mala Balanica, and Peˇsturina (southern Serbia) revealed assemblages of Middle Paleolithic artifacts associated with hominin fossils and animal bones. This paper focuses on Pesturina Layer 4, radiometrically and biostratigraphically dated to Marine Isotope Stage (MIS) 5, which yielded traces of temporary hunting camps. The remains of large ungulate prey are associated with predominantly ...
    centralni Balkan, srednji paleolit, Šarentijen, MIS 5, ponašanje neandertalca

  • A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian

    Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih (2021)
    Uvredljivi govor na društvenim medijima, uključujući psovke, pogrdni govor i govor mržnje, dostigao je nivo pandemije. Sistem koji bi bio u stanju da detektuje takve tekstove mogao bi da pomogne da internet i društveni mediji postanu bolji virtuelni prostor sa više poštovanja. Istraživanja i komercijalna primena u ovoj oblasti do sada su bili fokusirani uglavnom na engleski jezik. Ovaj rad predstavlja rad na izgradnji AbCoSER-a, prvog korpusa uvredljivog govora na srpskom jeziku. Korpus se sastoji od 6.436 ručno označenih ...
    uvredljivi jezik, govor mržnje, srpski, tviter, leksikon, korpus
    ... godina (eng. year), problem (eng. problem), pitanje (eng. question), etc. Word korona appears among the top 15 words, which is due to the current Covid-19 pandemic. We assumed that our data set might be biased considering the period of data capturing and that proved to be true. In the non-abusive set ...
    ... Измењено: 2023-10-14 04:19:42 A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] A Twitter Corpus ...
    ... 30]. Hate speech and flames are present in Serbian media and public discourse especially towards the LGBT population, Roma people, women and migrants [19]. Hate speech has become a major problem for all types of online platforms where an increasing amount of user-generated content appears: from comments ...

  • Uticaj finoće mlevenja rude rudnika Grot na tehnološke rezultate

    Ivana Božović (2024)
    Diplomski rad sa temom „Uticaj finoće mlevenja rude rudnika Grot na tehnološke rezultate” sastoji se iz dva dijela, opšteg i eksperimentalnog. U opštem dijelu prikazani su: * Istorijski razvoj rudnika „Grot”; * Geografski položaj rudnika „Grot”; * Geološke karakteristike ležišta; * Mineralni sastav i strukturno-teksturne karakteristike; * Prikaz postupaka pripreme mineralnih sirovina koji se primjenjuje u pogonu; * Opis šeme procesa; U drugom dijelu ovog završnog rada prikazani su rezultati eksperimentalnih ispitivanja koja su obuhvatila: uzorak, mineralnu sirovinu, hemijske analize i tehnološka ispitivanja. Na kraju ovog rada dati ...
    flotacijska koncentracija, olovo-cinkova ruda, Grot
    ... spiralni klasifikator (19) a odsev sita u mlin sa kuglama (18). Samlevena ruda iz mlina sa kuglama, (18), gravitacijski odlazi na klasiranje u spiralni klasifikator (19). Pjesak spiralnog klasifikatora vraća se na domeljavanje u mlin sa kuglama (18). Preliv spiralnog klasifikatora (19), odlazi u pumpu ...
    ... Fax: (381 11) 3235-539 DIPLOMSKI RAD Uticaj finoće mlevenja rude rudnika Grot na tehnološke rezultate Kandidat : Mentor: Ivana Božović, R59/19 Prof. Dr Predrag Lazić Rudarsko-geološki fakultet, Univerzitet u Beogradu Mentor : Prof. Dr Predrag Lazić Komisija za odbranu : Prof. Dr Predrag ...
    ... postrojenja, flotacija, uprava, magacini, rudničko nasclje) pripadaju opštini Vranjska banja. Od Bosilegrada je udaljeno u pravcu sever-severozapada 19 km, a od Vranja u pravcu istoka 28 km (vazdušnom linijom). Slika 2.. Pregledna geografsko-saobraćajna karta šireg područje rudnog polja „Grot“ ...

  • Опасности и штетности код производње текстилних компоненти за моторна возила

    Мара Павловић (2024)
    Рад се заснива на препознавању опасности и штетности којим су изложени запослени у једном привредном друштву чија је делатност производња звучне и топлотне изолација и заштите од вибрација за моторна возила. Ради истраживања и реализације постављених циљева, завршни рад је структуиран у три целине. У првом делу рада описан је технолошки процес и карактеристике материјала при производњи изолационих материјала од текстилног отпада и производњи полиуретанске пене. У оквиру другог дела описане су опасности и штетности којим су изложени запослени при обављању својих ...
    опасности, штетности, превентивне мере
    ... KOJI IPOMH3BOJIE TEKCTHJIHHX KOMIIOHEHTH J3A MOTOPHA BO3MJIA KanıujtaT: Menrop: BananaMup MuazncaBJbeBuh Mapa IHan.atonuh Bpoj uaHteKca P38/19 Beorpa/jn, cenreM0ap, 2024. rojn. KoMucnja: 1. BnaniMHp MuznuicaBJbeBHh ripo(b.J_ip, MeEHTOp Pynapcko-reo:moniku (akyanrer, Beorpa/n 2. A ...
    ... NpejcTaBJba HeOHacaH oTMmaj Koju je y cKmamy ca IIpaBMIHHMKOM O KaTeropHjaMa, HCHMHTHBaMDy H Knacnčpm(aunjn orTmajna („Cn. rmacaak PC“, op. 56/10, 93/19 a 39/21), paappcrauH y: TEeKCTHJ — OTHajH OJ MeXaHHuKOT TpeTMaHa OTIaJa (HHID. copTHpaMa, JpoOJbeĐa, KOMNaKTHpaĐba H HajeTH3OBaPba), KOJH HHcy Jpyrauuje ...
    ... KOJIMIMMA HJ pyuHHX IHaHcTHHMM BHJbyIIKapHMa TpaHCIOpTy]Jy y HIOrOH ca rIipecaMa 34 OOJTHKOBabMbe IIpOH3BOJla (crHKe 17-25). Cmaka 18: IIpeca Cnmaka 19: IIpeca 13 g Cnuka 20: IIpeca Cymia 25: IIpeca Cmaka 24: IIpeca 14 'Y aaBHCHOCTH OJL HaMCHe, IIDOH3BOJI ce y IIpecaMa O0ujkyje H ceue (caKe ...

  • Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    kvalitet podzemnih voda, arsen, analiza rizika, Panonski Basen
    ... concentra- tions exceed drinking water standards. Arsenic concentra- tions vary from 50 to 100 µg/L, with some municipalities recording up to 250 µg/L [19]. The aim of our study was to report current distribution of arsenic in drinking water from the public water supply system in the South Pannonian Basin ...
    ... below 10 µg/L (Fig. 5). The most frequent causes of physicochemical non-compliance in Srem are concentra- tions of iron and manganese higher than MPC [19]. In the Srem District, the mineral content of groundwater was found to be lower than in other parts of Vojvodina. Total hardness measured from 5°dH ...
    ... [µg/L] As [µg/L] As [µg/L] to a depth of 250 m, which meet drinking water standards. Depths below 250 m exhibited elevated total mineralization [19]. Arsenic Risk Assessment by the Drinking Water Pathway The end result of the assessment of groundwaters used for drinking water supply in the South ...

  • 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
    ... ues for Drenjak locality, the mean of four measurements, are: a = 5.744(8) A,b= 5.678(55) A, c=5.774(03) A, and P = 112.05(65)”. As reported in [19], the changes in the position of the (131) peak are a sensitive indicator of arsenopyrite composition. The (131) peak does not interfere with other ...
    ... line as the ratio standard element and line [20]. The calculated composition, mean of 16 spot analyses, was determined as (wt%): Fe 34, As 47, S 19 (sum 100); (at%): Fe 33.2, As 34.2, S 32.6; i.e., stoichiometric composition. The selected-area electron diffraction (SAED) pattern, recorded in the ...
    ... measured unit cell parameters for arsenopyrite. Ref. a[A] bIA] cIA] [:502] V[A3] Symmetry S.G. [5] 9.51 5.65 6.42 90.0 344.956 monoclinic B2i/d [19] 5.744 5.675 5.785 112.28 174.496 triclinic P-1 [10] 5.741 5.649 5.756 110.588 174.750 monoclinic P2,/c [9] 5.7612 5.6841 5.7674 111.721 175.456 ...

  • Merenje pritiska u bušotinskom cevovodu

    Ratko Matija (2024)
    Merenje pritiska ima veliki značaj u naftovodima i gasovodima. U ovom završnom radu analizirane su različite metode merenja pritiska , kao što su merenje pritiska manometrima sa tečnostima, kapacitivnim manometrima, električnim manometrima nekim drugim. Objašnjena je kalibracija senzora pritiska koja u velikoj meri utiče na tačnost merenja. Navedeni su i objašnjeni elementi cevovoda i u vezi s tim pad pritiska, čije je merenje tema ovog završnog rada.
    merenje pritiska, manometri, kalibracija, elementi cevovoda, pad pritiska
    ... 2. Manometri sa induktivnim pretvaračima...............................iiaaaa a eieataaatekatk 19 3.4.3. Manometri sa kapacitivnim pretvaračima ...............................iiiiiaaaaeeaeanaaakataek 19 3.4.4. Manometri sa piezoelektričnim pretvaračima ..............................oo.iaiaaaeanaananacak ...
    ... Završni rad Osnovne akademske studije Merenje pritiska u bušotinskom cevovodu Kandidat Mentor Ratko Matija Prof. dr Snežana Aleksandrović R64/19 Beograd, septembar 2024.godine Komisija: 1 . Prof. dr Snežana Aleksandrović, mentor Rudarsko -geološki fakultet, Beograd 2 . Prof. dr Dušan ...
    ... Pogotovo su pogodni za merenje niskih pritisaka. Princip rada: usled delovanja pritiska pomera se jedna elektroda električnog kondenzatora > AC. 19 Sa jedne strane membrane je mereni pritisak, a sa druge strane je izolovana komora sa vakuumom. Izrađuju se kao pločasti i cilindrični. Imaju nelinearmu ...

  • 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
    ... sion, at a depth of about 155 m (KNEŽEVIĆ, 1989 – see Fig. 19). Besides, it was discovered that similar Pontian sediments were deposited over the palaeorelief of Jurassic and Cretaceous rocks in the area of Pinosava, e.g. borehole KGK-15 (Fig. 19). At bore- hole KGK-13 near Resnik (187 m a.s.l) these ...
    ... the at the top of core, up to 6.5 m of poorly cemented loess-like sediments constitute the last stratigraphic unit. 4.2.2. Borehole BT1-3 (N 44°43′19″, E 20°34′36″) The second borehole, drilled in the vicinity of BT1-2 (Fig. 1), reached the ?Lower Miocene reddish series at a depth of 47 m (the Bučvar ...
    ... sediments (e.g. Bučvar clastites) are present over larger areas than previously known (clastites are found in the vicinity of Leštane and Resnik, see Fig. 19). In this study, however, there is insufficient information about the sedimentary conditions in which they were formed, especially since these deposits ...

  • A necessary and sufficient condition for an algebraic integer to be a Salem number

    Dragan Stankov (2019)
    We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • Linear-motor plunger pump increases lifting efficiency

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

  • Definisanje specifičnih uslova dreniranja podzemnih voda na karstnim vrelima Krupac 1 i 2

    Kristina Gavrilović (2024)
    Izvorište Krupac se nalazi u jugoistočnom delu Srbije, u blizini grada Pirota i deo je sistema za vodosnabdevanje grada i okolnih mesta. Vrela Krupac 1 i Krupac 2 su gravitaciona karstna vrela, locirana na kontaktu jursko-krednog kompleksa stena sa neogenim naslagama Pirotske kotline, čije su specifičnosti uslova dreniranja, kao i uslova cirkulacije, ispitane hidrohemijskim i izotopskim metodama, kao i opitom obeležavanja ponora Golema dubka. Ustanovljeno je da se radi o mladim vodama i sistemu bez duboke cirkulacije podzemnih voda, ...
    izvorište “Krupac”, specifični uslovi dreniranja, karstna izdan, režim izdani
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