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1091 items

  • Техно-економска оцена подземног откопавања лежишта бакра применом коморно-стубне методе

    Александра Бараћ (2024)
    Коморно-стубна метода са блоковским откопавањем и засипавањем откопа паста засипом омогућује високу продуктивност, флексибилност при раду, остварење пројектованог производног задатка, минимално осиромашење откопане руде, у овом случају руде бакра, висок степен искоришћења расположивих рудних резерви. Припрема лежишта за експлоатацију представља инвестицију у рударској производњи,а сам коначан производ треба ,не само да отплати те трошкове, већ и да донесе новчану добит.Самим тим је од великог значаја адекватан одабир методе откопавања, која ће на најбољи могући начин испунити све захтеве.Основни показатељи ...
    техно-економска оцена, бакар, коморно-стубна метода, засипавање, нето, рентабилност
    ... 42.3 CraOMJHocT H NHMCH3HOHHCaMbC OTKOII4.........aaaa da adduidtaı 35 42.4 · JamyMaBaMbec OTKOHaHOr HIpOcTOpa IacTa 3aCHTIIOM .. naaaaanaaattek 36 42.5 · Bepramanja a aaaaaaa a aaaaaaaaaaaaaaaaaaaatatet 36 4.2.6 | QJUBOJIĐ5aBaFĐbC ... da duuu d dd aouiadadtuı 37 5. TexHO-ceKOHOMCKa OLIcHa O ...
    ... IIlojMoOBH TeXHO-ČKOHOMCKC OILCH6C ... L 3. OTBAPAMĐE H PA3PAJIA EKCIIJIOATALIHOHOT IIOJIPVUJA... 3.1 IIonezna eKcrnoaTanHOHOT 34aXBaTa ... auu da adduuudtit, 18 3.2 Jlokanuje orBapabba H pa3pajta JIeKHITA.aaaaaaa a aaaaaanaaaaaaaaaaaaateot 20 3.3 TexHojoruja H3pajie IpocTopHja alynaaaaa a ...
    ... je HpHCyCTBO BHIHeC jeceTrHHa pynHMx TeMa pa3nMuMTHX pa3Mepa, reHe3c H CTpyKTypHO-TeEKCTyDpHOTr THHa Opy,yubehba, HacTajHHXx y HepHo,ny TOpMĐa Kpe/da-maJIcOreH, y CJIO)KEHHM nponecHMa CTpyKTypHOo-reo:monikor yoOnmuaBabba MarMaTCKOT KOMIIJIĆKCa. V TOM THIpocTopy je Hocajli HHJIeHTHQ)HKOBaHoO 30 ...

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... . Chemical analyses (470 samples of groundwater) were statistically processed to assess and interpret hydrochemi- cal data and to generate a prognostic hydrochemical map. The data were statistically processed and graphically inter- preted by water supply source and by populated area using statistical ...
    ... ingested inorganic arsenic in drinking water. Brit. J. Cancer, 66, 888, 1992. 4. BERG M., KIM TRANG P.T., STENGEL C., BUSCHMANN J., HUNG VIET P., VAN DAN N., GIGER W., STÜBEN D. Hydrological and sedimentary controls leading to arsenic contamination of groundwater in the Hanoi area, Vietnam: The impact ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... 8th ed.; University of Umea: Umea, Sweden, 1991. Kakoulli, L.; Prikhodko, S.V.; King, A.; Fischer, C. Earliest evidence for asbestos composites linked to Byzantine wall paintings production. J. Archaeolog. Sci. 2014, 44, 148-153. [CrossRet] Colomban, P.; Ambrosi, E.; Ngo, A.-T.; Lu, T.-A.; Feng ...
    ... slit #1, 20 mm; and receiving slit #2, 20 mm. All specimens were rotated during data collection with a speed of 60 rpm. PDXL 2 software (version 2.8.3.0), Rigaku Corp., Tokyo, Japan) was used for the powder diffraction data analysis [12]. The analyzed surface area (20 x 20 mm?) and the fine powdering ...
    ... by Rigaku (Rigaku Corp., Tokyo, Japan). CuK,„ radiation was used. The diffractometer was equipped with a KB filter and a D/teX Ultra 250 detector. Data were collected between 5 and 70” 20 at every 0.01* in the Bragg; Brentano geometry. The scan speed was 59/min and the slit configuration was as ...

  • 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
    ... rakovičkih  klastita“,  budući  da  ne  obuhvata  samo  peskove  (po  uzoru  na  terminologiju  prikazanu  u  Anđelković M. & Anđelković J. (1997)).  Ove bi facije u nekoj drugoj studiji mogle biti posmatrane i u svetlu formacione geologije.    ZAHVALNOST    Autori bi želeli da se zahvale kolegi Milošu R ...

  • Флотабилност халкопирита из полиметаличне руде рудника „Рудник”

    Ђурица Н. Никшић (2022)
    The doctoral dissertation Chalcopyrite flotability from polymetallic "Rudnik" mine ore consists of two parts. The first part is a general part in which the theoretical foundations of the flotation concentration process, the flotation properties of chalcopyrite, the influence of certain flotation reagents and the mechanism of action on the flotation properties of chalcopyrite are presented. This part also describes the process of flotation concentration of polymetallic ore from the "Rudnik" mine. The second part is ...
    Халкопирит, флотацијска концентрација, KAX, NaCN, pH пулпе

  • Sinteza i strukturna karakterizacija novih cezijumskih i kalijumskih silikata sa elementima retkih zemalja

    Predrag Z. Dabić (2022)
    Predmet i ciljevi naučnog istraživanja ove doktorske disertacije su sinteza i strukturna karakterizacija novih cezijumskih i kalijumskih silikata sa elementima retkih zemalja. Istraživanja su izvedena u okviru sistema SiO2–REE2O3–XF, gde REE predstavlja trovalentni katjon elementa retkih zemalja (Sc, Y, Sm, Eu, Gd, Ho, Er, Tm, Yb, Lu), dok X predstavlja jednovalentni katjon alkalnih metala (K, Cs). Rad na disertaciji bio je fokusiran na sintezu monokristala, određivanje kristalnih struktura, kao i na kristalografsko i kristalohemijsko ispitivanje sintetisanih monokristala. Monokristali su sintetisani ...
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu, elementi retkih zemalja

  • Epidotizacija sanidina u kvarclatitima Grota

    Danica Srećković-Batoćanin, Suzana Erić, Nikola Novičić, Nikola Pašajlić, Natalija Batoćanin (2023)
    Propilitska alteracija je veoma česta u gornjokredno-tercijarnim vulkanitima Srbije. Kvarclatiti Grota, otkriveni na dubini od oko 550 m u jednoj od istražnih bušotina su holokristalaste porfirske strukture sa fenokristalima sanidina dimenzija i do 1,5 x 2 cm. Optičkim ispitivanjima su u kvarclatitu potvrdjeni i elementi sitaste, pojkilitske i glomeroporfirske strukture. Kao fenokristali prisutni su sanidin, plagioklas, kvarc, biotit i amfiboli. Sekundarni minerali su hlorit, epidot, coisit, Fe-hidroksidi, redak kalcit i ilit. U fenokristalima sanidina se zapažaju „lepeze“ izduženih kristala ...
    Grot, kvarclatiti, sanidin, epidot

  • The Effect of Gravel and Sand Mining on Groundwater and Surface Water Regimes — A Case Study of the Velika Morava River, Serbia

    Milan Kresojević, Vesna Ristić Vakanjac, Dragan Trifković, Jugoslav Nikolić, Boris Vakanjac, Dušan Polomčić, Dragoljub Bajić (2023)
    Овај рад описује како неконтролисано и нелегално откопавање песка и шљунка може утицати на режим површинских и подземних вода на местима где постоји активна хидрауличка веза између њих, са студијом случаја реке Велике Мораве у Србији. Такође, промена геометрије попречног профила, као последица антропогених и природних фактора, отежава уливање ове реке за укључивање у водне токове Србије. Плодност Велике Мораве омогућила би развој речног саобраћаја како за трговачке бродове, тако и за пловила Речне флотиле Војске Србије. Корелације између ...
    експлоатација песка и шљунка, режим површинског тока, режим подземних вода

  • Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world

    Bogoljub Vučković, Bojan Dimitrijević (2023)
    The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...
    lignite, heavy metals, concentrations
    ... considered that coals are extremely "toxic" and that their burning leads to significant soil pollution throughout Serbia and the world. However, measured data on HM content in the soil of cities throughout Serbia show a completely different picture. Namely, the contents of Zn, Pb and Cu are significantly ...
    ... early 2023. i TOPFIVE: ATBOTTOM: -| SeriKembagan, MAL Damascus, YR Hi Rawalapindi, PAK Erdenet, MON :# Oweri, NIG MI Coal, SER New York, USA Da Nang, VIE Chicago, USA Yan'an, CHN z 55e P Cu, ppm - World Cities Top Soil VS. Kostolac Coal Year, early 2023. [0 TOPFVE: ATBOTTOM: - Oweri ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... within enterprises that generates expert knowledge. Although higher education institutions (HEI) endeavor towards keeping academic curricula up-to-date with novel entrepreneurial knowledge, this has become a critical issue, especially in engineering disciplines. Technological development generates ...
    ... university students' knowledge with entrepreneurial knowledge that might prove useful in their future jobs, to keeping their academic knowledge up-to-date once they have graduated, by offering them a live-long learning opportunity as employees. There are, however, several critical issues, which might ...

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... was separated into recrystal- lized gypsum (PGIP), insoluble residue (PGIR) and Josip |. Išek et al. supernatant. Using the available literature data and general knowledge of the phosphoric acid production process, the most significant impurities identified in raw phosphogypsum were detrital quartz ...
    ... ZOSHg) ll}sn) XSSr, BSY and ZlOPb radionuclides with energies that ranged from 46.5 to 1898 keV and with a total activity of 72.4 kBq at the reference date of 31 August 2012. The samples of raw phosphogypsum were measured twice, before and after the sealing of the samples' containers, and the purified ...

  • Снимање подземних инсталација GPR (Ground penetrating Radar) системом

    Невена Ђурђев (2024)
    Циљ овог мастер рада на тему ,,Снимање подземних инстлација GPR (Ground penetrating radar) системом” је био да се прецизно идентификују положаји подземних инсталација и прикључака, због сумње да су поједине инсталације постављене изван пројектованих позиција.Георадарски систем одабран је за детектовање и идентификовање подземних инсталација, због своје способности да обезбеди неинвазивно и детаљно снимање подземних структура.Првобитно је примењена GNSS метода снимања коришћењем GPS-а, потом услед немогућности отварања шахти, одлучено је да се примени георадарска у комбинацији са електромагнетном методом. Након ...
    катастар, катастар водова, подземне инсталације, методе детекције подземних инсталација, георадарска метода, георадар
    ... /' - AC and DC charging - Details for pipeline evaluation i- s> Data Logging - 50 Million record internal storage - A-Frame Fault and Holiday Locator / - GPS coordinates / - Download data with MyLocator app /' - Access data via VMMap Cloud app Antenna Configuration / - Depth, current, user ...
    ... BOJUOOBa KOpHcTe ce KapTorpaQckKa upojeKkuuja, pa3Mepa H OHmuHc, HponHcaHH 32A TCOJUTCKC HaHOBC. IIpHMep Oo3HaKa 3a BOJIOBC H HOJI3CMHE O0JeKTe ripHKa?daH je Ha cH 2.1. [5]. 16 KATACTAP BO/BIOBA: BOJIOBO/IHA MPEXKA T61-03 ie} Pewu 6yHap x Bla T61-04 e UUesacru 6yHap x B16 T61-05 @ Aprecku 6yHap ...
    ... osnovu prijave - zahteva, koja je zavedena pod brojem od godine, izvršeno je geodetsko snimanje dužine metara, koji je ucrtan na skici snimanja br. dana godine u KO Potvrda se izdaje, shodno članu 100. stav 4. Zakona o državnom premeru i katastru i upisima prava na nepokretnostima ("Službeni glasnik ...

  • Dvodimenzionalna geometrijska morfometrija prvih gornjih molara hominina sa teritorije Srbije - taksonomska i metodološka analiza

    Predrag N. Radović (2022)
    Primarni cilj ove studije tiče se taksonomske identifikacije fosilnih prvih gornjih molara (M1) hominina pronađenih u Srbiji, primenom metoda dvodimenzionalne (2D) geometrijske morfometrije. U prvoj (metodološkoj) fazi istraživanja ispitana je efikasnost 16 različitih pristupa (geometrijskih modela) u klasifikaciji M1 neandertalaca i anatomski modernog čoveka. Modeli su testirani na dva seta okluzalnih projekcija krunica (n = 34 i n = 64) dobijenih orijentisanjem digitalnih 3D modela u virtuelnom okruženju ili fotografisanjem fizičkih primeraka zuba. Prilikom testiranja primenjena je klasifikacija zasnovana ...
    2D geometrijska morfometrija, prvi gornji molar (M1), taksonomska identifikacija, neandertalci, anatomski moderni ljudi, Pešturina, Velika Balanica, Srbija

  • Epidotized sanidine in quartzlatites from Grot

    Danica Srećković-Batoćanin, Suzana Erić, Nikola Novičić, Nikola Pašajlić, Natalija Batoćanin (2023)
    Propilitska alteracija je veoma česta u gornjokredno-tercijarnim vulkanitima Srbije. Kvarclatiti Grota, otkriveni na dubini od oko 550 m u jednoj od istražnih bušotina su holokristalaste porfirske strukture sa fenokristalima sanidina dimenzija i do 1,5 x 2 cm. Optičkim ispitivanjima su u kvarclatitu potvrdjeni i elementi sitaste, pojkilitske i glomeroporfirske strukture. Kao fenokristali prisutni su sanidin, plagioklas, kvarc, biotit i amfiboli. Sekundarni minerali su hlorit, epidot, coisit, Fe-hidroksidi, redak kalcit i ilit. U fenokristalima sanidina se zapažaju „lepeze“ izduženih kristala ...
    Grot, kvarc latiti, sanidin, epidot

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... 70%, and 100% are very close. The shear strength parameters of the Mohr–Coulomb failure criterion were calculated based on the measured laboratory data, which are shown in Table 4, while the comparative relationship is shown in the diagram (Figure 12). Table 4. Shear strength parameters of the Mohr-Coulomb ...
    ... V.Č.; validation, V.M., D.S. and N.Ž.; formal analysis, V.R. and V.Č.; investigation, V.R., V.Č., V.M., D.S. and N.Ž.; resources, V.R. and V.Č.; data curation, V.M., D.S. and N.Ž.; writing—original draft preparation, V.R.; writing— review and editing, V.Č.; visualization, V.M., D.S. and N.Ž.; supervision ...
    ... read and agreed to the published version of the manuscript. Funding: This research received no external funding. Minerals 2021, 11, 813 19 of 19 Data Availability Statement: Not applicable. Conflicts of Interest: The authors declare no conflict of interest. References 1. Tziallas, G.; Saroglou, ...

  • Tехничко решење заштите површинског копа Дрмно од површинских вода у 2025. години

    Иван Јованчевић (2024)
    Објекти одводњавања површинског копа морају поуздано обављати своју функцију, а да су при томе економични. Једна од функцијуа им је и да спрече доток површинских вода у радну контуру површинског копа, као и да воде које доспеју у радну контуру, прихвате и спроведу до водосабирника, а затим је одатле одстране ван радне контуре површинског копа. Овим завршним радом је сагледано постојеће стање система одводњавања површинских вода на површинском копу лигнита Дрмно у 2024. години, и дато по мом мишљењу једно ...
    Одводњавање, површински коп, лигнит, Дрмно
    ... Beorpajt /laTyM ojopane: Pe3uMe O0jekmu oOsoOmasamwa nospuuncko? kona Mopajy noy30ano o0asa/;bamu c6Ojy dbynukuujy, a da cy npu moe ekoHoMuuHu. JeOna oO qbynakuujya u Je u da chnpeue OoOmok nosapuuHcKux 600a y paOHy KOHmypy no6puuuuHckoo Koha, Kao u Oa 6ode Koje Oochejy y paony konmypy, npuxeame ...
    ... IlorpeOHa pajnHa cHara ......... 3.7. IIpennMep H npenpauyH pajtoBa 3.8. IloceOHe Mepe 3amıTHTe .O aananananaaraataraeatataaaatati 4. SAKJPVIJAK alyna da aaaaaaaaaaaaaaaa a aaaaNataNtt 1. VBOJI lla M3pane OBOr 3aBpmmHor pama je HNOCTH3aMĐbC OHTHMAJIHC M CHTypHe ekKcrmioaTarluije yrJba ca acrIeKTa ...

  • Analysis and Calculation of MMRS and Primary Gas Distribution Network in Urban Environment – Case Study Kučevo

    Aleksandar Madžarević, Pavle Janković (2022)
    Oblast primene prirodnog gasa je veoma široka. Kao energent može se koristiti za proizvodnju energije u elektranama, toplanama i postrojenjima za kombinovanu proizvodnju energije ili za zadovoljavanje različitih toplotnih potreba u industriji i širokoj potrošnji. Gas se može upotrebiti i kao sirovina u hemijskoj i petrohemijskoj industriji, a tokom poslednjih decenija nalazi primenu i u saobraćaju kao pogonsko gorivo u SUS motorima. Sa ekološkog stanovišta, prirodni gas predstavlja najprihvatljiviji izvor energije u poređenju sa drugim fosilnim gorivima. Pri sagorevanju ...
    distribucija gasa, projektovanje gasovoda, analiza potrošnje

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... konstrukcija (gornji i donji stroj puta). Elektrofilterski pepeo se može primjenjivati za izradu elemenata cestovne konstrukcije, ali treba voditi računa da se ugrađivanje odvija u segmentima, izoliranim od utjecaja površinskih i podzemnih voda. Ključne riječi: elektrofilterski pepeo (leteći pepeo); kemijski ...
    ... of 40 kV. Record the sample is performed in the range of 2θ from 5 to 50° with a step of 0,02° and a retention time of 0,5 s at each step. The data position of the diffraction peaks 2θ (°), the value of the flange distance d (m), and the corresponding intensities (I) use impulse unite (imp). ...
    ... a series of insufficiently defined peaks of very low intensity, which indicate the beginning of crystallization of new phases, according to the data could match the compounds from the group of hydrated Ca - aluminates or sulfoaluminates. At 29,5° a new peak was noted corresponding to the maximum ...

  • Resource-based WordNet Augmentation and Enrichment

    Ranka Stanković, Miljana Mladenović, Ivan Obradović, Marko Vitas, Cvetana Krstev (2018)
    In this paper we present an approach to support production of synsets for SerbianWordNet(SerWN)byadjustingPrincetonWordNet(PWN)synsetsusing several bilingual English-Serbian resources. PWN synset definitions were automatically translated and post-edited, if needed, while candidate literals for Serbian synsets were obtained automatically from a list of translational equivalents compiled form bilingual resources. Preliminary results obtained from a setof1248selectedPWNsynsetsshowthattheproducedSerbiansynsetscontain 4024 literals, out of which 2278 were offered by the system we present in this paper, whereas experts added the remaining 1746. Approximately one half of ...
    WordNet, bilingual resources, term alignment, parallel lists
    ... a method for Sanskrit WordNet extension using a Sanskrit English dictionary is presented. The dictionary entries were automatically extracted and linked to PWN. In (Simões et al., 2016) an approach is given to enrichment of Portuguese WordNet with synonyms available in a standard monolingual Portuguese ...
    ... xls format, with 6,939 term entries, and 6,971 aligned pairs of terms. Microsoft language portal10 has published Microsoft Terminology Collection data in the form of a .tbx (ISO 30042:2008) file containing: Concept ID, Definition, Source term, Source language identifier, Target term, Target language ...
    ... letter, e.g. ML next to the term pair update - ažurirati means that this pair was found in the list obtained from Microsoft Terminology Collection data (M) and the parallel list (L). If the expert wants to add a new literal, he/she must insert a row, and copy the appropriate ID in the first column ...

  • 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