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Упит dcterms_subject_txt:Sadržaj metala u olivinu

4271 items

  • The oil industry and climate changes

    Dejan Radivojević (2020)
    Uprkos tome što je problem klimatskih promena poznat dugi niz godina i dalje veliki broj ljudi poistovećuje pojam vremenskih prilika sa klimom ne uzimajući u obzir različitu dužinu njihovog trajanja. U medijima se vrlo često mogu naći katastrofična predviđanja vezana za zagrevanje naše planete usled neodgovornog ponašanja čoveka. Sa druge strane geolozi znaju da je tokom geološke prošlosti naše planete bilo mnogo toplijih intervala od današnjih kao i da ti intervali nisu neminovno rezultovali masovnim izumiranjem živog sveta već su ...
    vremenske prilike, klima, naftne kompanije, strategije, Srbija

  • Vodosnabdevanje podzemnim vodama u Srbiji-stanje i perspektive

    Dušan Polomčić, Zoran Stevanović, Petar Dokmanović, Petar Papić, Vesna Ristić-Vakanjac, Bojan Hajdin, Saša Milanović, Dragoljub Bajić (2011)

  • 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
    ... više radnih Jedinica i to su „Kolubara-Površinski kopovi“, „Kolubara-Prerada,“ Kolubara Metal“, „Kolubara Projekt“, koje se osim proizvodnje i prerade uglja bave i proizvodnjom rudarske opreme i projektovanjem u oblasti rudarstva ı građevinarsta. Ogranak „Površinski kopovi“ sačinjavaju: Polje „E“ ...
    ... dana ili više. Ovo održavanje obuhvata pored radova koji su predviđeni servisom i sve radove, koji su navedeni u nalogu za popravku. Njega izvode investicione grupe iz „Kolubare-Metal“ potpomognute ekipama iz radionica pri površinskom kopu. Slika 4 Kugle i Staze Slika 3 Rotorni bager SRs 1300 za ...
    ... 68 Univerzitet u Beogradu – Rudarsko-geološki fakultet Diplomski rad 60*U T7T*D*nm 7r*9*5,85 m n = — U =O ——= = 2,75 — T7T*D 60 60 s n 134,7 n, = = _ = 5,85 m 23 nr- broj obrtaja rotornog točka u minuti n- broj pražnjenja kofica u minuti m- broj kofica koji je u kontaktu sa masivom ...

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... decrease of C = O after grinding. The O1s signal of HW1100g* contains an additional signal (O1s?) that could not be identified. It may come from metal oxides that are enriched at the out- side of the particles. This signal disappears after grinding probably due to a relative enrichment of material ...
    ... 1016/j.fuel.2014.01.083. Inyang MI, Gao B, Yao Y, Xue YW. Zimmerman A, Mosa A, et al. A review of biochars as a low-cost adsorbent for aqueous heavy metal removal. Crit Rev Environ Sci Technol. 2016; 46: 406–—433. https://doi.org/10.1080/10643389.2015.1096880. Enaime G, Bacaoui A, Yaacoubi A, Liibken ...
    ... doi.org/10.2136/sssaspecpub63.2014. 0040. Majumder S, Neogi S, Dutta T, Powel MA, Banik P. The impact of biochar on soil carbon sequestra- tion: Meta-analytical approach to evaluating environmental and economic advantages. J Environ Man- age. 2019; 250: 109466. https://doi.org/10.1016/|.jenvman.2019 ...

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • A Simple Flow Injection System for Amperometric Detection of Ascorbic Acid Using Carbon Paste/Copper Schiff Base Composite Electrode

    Mihajlo Kulizić, Milan Stanković, Marija Rašić, Aleksandar Mijatović, Rada Baošić, Aleksandar Lolić (2023)
    askorbinska kiselina, elektroda modifikovane ugljenične paste, analiza protočne injekcije, dijetetski suplementi, amperometrija
    ... as antifungal, antibacterial, antiviral, antipyretic but they also show good catalytic activity in various reactions.*"" The use of transition metal complexes, as mediators, can significantly decrease the overpotential and increase the sensitivity and selectivity of electrochemical sensors. ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0009275 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...
    ... Milan Stanković, Marija Rašić, Aleksandar Mijatović, Rada Baošić, Aleksandar Lolić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] A Simple Flow Injection System for Amperometric Detection of Ascorbic Acid Using Carbon Paste/Copper Schiff Base Composite Electrode ...

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods
    ... ja rotornih bagera u Elektroprivredi Srbije (EPS). 2. Todorović, J., & Zelenović D. (1990). Efektivnost sistema u mašinstvu (operativna gotovost, pouzdanost, funkcionalna gotovost). Naučna knjiga, Beograd. 3. Ivković, S. (1997). Otkazi elemenata rudarskih mašina. Univerzitet u Beogradu, Rudarsko- ...
    ... selecting optimal equipment for the blasting process [9, 10]. The AHP method has proven to be a quality tool for the analysis of the quality factors in metal processing [11]. The selecting of the optimal block size for the needs of the coal deposit modeling process and mine planning can be done with the ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0005570 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...

  • Hydrogeochemical distribution of Ca and Mg in groundwater in Serbia

    Petar Papić, Jovana Milosavljević, Marina Ćuk, Rastko Petrović (2014)
    ... groundwater and in the environment in general, and are also essential to the human body (Jovic & Jovanovic,2004). Ca is the most abundant alkaline earth metal in the Earth's crust and the main ingredient of many minerals and rocks. The most common Ca-rich minerals are: calcite, aragonite, dolomite, gypsum ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0004968 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...
    ... Box I I 320, 2301 EH Leiden, The Netherlands e-mail: Pub.N L@taylorandfrancis.com wwwcrcpress.com - www.taylorandfrancis.com U b r a r y of Congress Cotal o$ ng-i n-P u bli cat i o n D oto Calcium and magnesium in groundwater: occurrence and human health / editor: Lidia Razowska-Jaworek. -- Edition ...

  • 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

  • Ostvarivanje dobiti pri uvođenju sistema agregatnih zamena na osnovnoj rudarskoj mehanizaciji površinskih kopova EPS

    Predrag Jovančić, Ignjatović Dragan, Đenadić Stevan (2021)
    Jedan od osnovnih zadataka na površinskim kopovima uglja je ostvarivanje zadovoljavajućeg vremenskog i kapacitetnog iskorišćenja kontinualnih sistema. Da bi se to postiglo, neophodno je izvršiti izmene u postojećoj strategiji održavanja. Preduslov je uvođenje agregatne zamene vitalnih delova na rudarskim mašinama. Benefiti su višestruki. Očekivani rezultati ovakvog pristupa su: smanjenje zastoja i povećanje vremena rada; direktne materijalne uštede; bolja organizacija rada; racionalizaciju radioničkih i magacinskih kapaciteta; povećanje vrednosti mašina. Da bi se uvela agregatna zamena neophodne su investicije za nabavku ...
    agregatne zamene, održavanje, mehanizacija, Benefit Cost analiza
    ... remont. U ovom slučaju je reč o delu preduzeća Kolubara Metal koja je bila angažovana na sprovođenju remontnih aktivnosti na pojedinim bagerima RB Kolubare. U Tabeli 5 prikazani su parametri troškova na sprovođenju remonta kao i specifični trošak kao krajnji rezultat. Treba napomenuti da su u razmatranje ...
    ... miliona € godišnje. U prvo vreme ušteda bi mogla iznositi između 8-10% u odnosu na planirana sredstva od 22,6 miliona €. To bi iznosilo oko 2,03 miliona € godišnje. Imajući u vidu planiranu unifikaciju kao i mogućnost uvođenja novog sistema održavanja, ove vrednosti mogu biti i veće u budućnosti, čak ...
    ... parametara. Gotovinski tok na strani troškova uključuje inicijalna investiciona ulaganja u petogodišnjem periodu u agregatnu zamenu i elemente dok se u kasnijem periodu kao troškovi javljaju samo troškovi elemenata. U prvom petogodišnjem periodu benefiti su valorizovani srazmerno dinamici investicionih ...

  • 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
    ... Abdelmalek et al, ). The XRPD traces of the oriented clay fractions of the investigated samples are presented in . The transformation of kaolinite into meta- kaolin is observed with the disappearance of the reflection at 12.3%20 (7.1 A) after heating at 500% (Bergaya & Lagaly, ; Abdelmalek et al., ). ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0008254 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...
    ... manufacture of traditional pottery Maja Milošević, Biljana Đorđević, Mihovil Logar Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery | Maja Milošević, Biljana ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...

  • 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)
    ... Based on the analyzed water samples we can conclude that the elevated α- and β-activities were found mainly in waters originating from magmatic and meta- morphic rocks. Natural radioactivity was mainly due to the high content of 40K and naturally occurring radionuclides of the 238U and 232Th series ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0004974 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...
    ... Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization | Maja Todorović, Jana Štrbački ...

  • 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

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... ciljem identifikacije glavnih izvora emisija. Pokazano je da je glavni izvor emisija sagorevanje gasa, pri čemu ključni doprinos daje neizgoreli metan. Ključne reči — cencrgetska tranzicija, emisije gasova staklene bašte, industrija, nafta & gas. IINTRODUCTION he global population growth and ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0008341 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...
    ... mera i aktivnosti u cilju smanjenja emisija gasova staklenc bašte. S obzirom na značajan doprinos globalnom cfektu staklene bašte, industrija nafte i gasa se suočava potrebama za procenom, ublažavanjem i smanjenjem uticaja njihovog poslovanja na atmosferu kako bi ostala konkurentna u novonastaloj zelenoj ...

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje
    ... method since they provided accurate results and generalized effectively regardless of the input data distribution or type. Recently, ensemble (multi- or meta-) learning has become more popular in LSA than SVM and other techniques. Random Forest (RF), a relatively new ensemble learning technique, revolutionized ...
    ... lity. When it replaces the dot product in the linear equation the classification function becomes: The RF is actually an ensemble learning method (meta-classifier) that combines multiple Random Tree (RT) algorithms, which are learning techniques on their own. The RT algorithm has a tree-like structure ...
    ... http://dr.rgf.bg.ac.rs/s/repo/item/0005127 Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду омогућава приступ издањима Факултета и радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The ...

  • 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

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)

  • Глаголи у кухињи и за столом

    Цветана Крстев, Биљана Лазић (2015)
    У раду је приказано истраживање лексике на српском језику кулинарског домена које се заснива на коришћењу доменског корпуса, електронских лексичких ресурса, пре свега WordNet-а и морфолошких речника, и локалних граматика. Приказане су доменске специфичности ових ресурса, како се користе, и међусобно употпуњују. Посебно је приказано како се коришћењем доменског корпуса могу екстраховати глаголи специфични за кулинарски домен и описати начини њиховог коришћења. Дат је попис глагола са основним подацима који је добијен применом представљених метода.
    аутоматска обрада, коначни трансдуктори, електронски речници, семантичке мреже, локалне граматике, кулинарство

  • 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)