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Упит dcterms_subject_txt:арсенати прелазних метала

366 items

  • 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
    ... Arsenic (As) occur naturally in the environment in a number of different forms. Some are toxic, while others are not. Pure arsenic, a gray-colored metal, is rarely found in the environment. Instead, it is usually combined with one or more other elements such as oxygen, chlorine, and sulfur. This combination ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • 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

  • 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

  • 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

  • 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 ...

  • 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

  • Using Metadata For Content Indexing Within An OER Network

    Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci (2014)
    ... metadata specification[10].The standard groups data elements to describe a learning resource into the following nine categories: general, lifecycle, meta-metadata, technical, educational, rights, relation, annotation and classification. LOM Standard has more than 70 possible elements, andFriesen ...

  • 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)
    ... Arsenic (As) occur naturally in the environment in a number of different forms. Some are toxic, while others are not. Pure arsenic, a gray-colored metal, is rarely found in the environment. Instead, it is usually combined with one or more other elements such as oxygen, chlorine, and sulfur. This combination ...

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... (Koutsomitropoulos et al., 2010). The LOM Standard groups data elements for describing a learning resource into nine categories: general, lifecycle, meta-metadata, technical, educational, rights, relation, annotation and classification. It has more than 70 available ...

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... synthetic mineral standards including albite (Al, Si), wollastonite (Ca), titanium monoxide (Ti), chromium oxide (Cr), and manganese (Mn) and iron (Fe) metal. Backscattered (BSE) images were used to reveal zoning and possibly inclu- sions of another mineral phase within the garnet and zircon crystals. ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • 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

  • Управљање отпадом – услови, циљеви и изазови на домаћем тржишту

    Дарко Драгићевић (2024)
    Тема овог завршног рада обухвата анализу система управљања отпадом на домаћем тржишту, са посебним освртом на постојеће изазове и могућности за унапређење. Управљање отпадом је кључна компонента заштите животне средине и одрживог развоја, док у Србији ова област пролази кроз процес трансформације у складу са захтевима Европске уније и међународним стандардима. Овај завршни рад је пружио боље разумевање сложености управљања отпадом у Србији и понудио практична решења која могу помоћи у остваривању одрживог развоја у овој области.
    Заштита животне средине, управљање отпадом, комунални отпад, рециклажа
    ... yTHIAja Ha )KHBOTHy CpeJUHHy, OJIHOCHO IHIHpcHbC nmojyTaHaTa. V npoMaBoje OMomomIKor pa3maraMbba HacTajic H3 UBCTHX OTHaJa cHajlajy KOMNOCT, MeTaH, HIpoOTeHHH H aJIKOXOJIH H_ ipyra opraHcka jenmema??. OcHoOBHH ripomecH Haa3e ce y cnenehoj raOenu. Ta6ena 8.1 buonouku npouecu Koju ce npue!byjy ...
    ... rypŠnHa CATOPEBAHE (s85osc) MeuraHM KoMyHanHM oTnaA, /Aowe neneo Tipepaaa » _ nereher nenena Ć _ T — MckopviuihaBsae vi peuviknaxa MeTana {\enoHoBabe w aTepuvjana Cnuka 8.1 IJeMamcku npuka3 npoueca cazopesatba omnaoa y cnanuoHuuu (EPD HK, 2009) TIpeyinocru riponeca crajbHBamba ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... and leachate water 5 3 1 + 0 + 1 + 1 + 0 + 1 60 33 Dam failure and flowing of water and ash into the recipient 1 3 1 + 0 + 1 + 1 + 1 + 1 15 34 Heavy metal emission into the surrounding soil 5 3 1 + 0 + 1 + 1 + 0 + 1 60 35 Emission of solid particles and gases during spontaneous combustion of coal 2 3 1 ...
    ... and Development; Federal Ministry for Development, Science and Environment: Belgrade, Serbia, 1997. 7. Miljkovic, M.; Stojkovic, Z. Influence of Metal Ores Surface Extraction to Environmental Factors of the Environment; Faculty of Engineering, Department for mining engineering, University of Belgrade: ...

  • Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone

    Emő Márton, Marinko Toljić, Vesna Cvetkov (2022)
    The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm ...
    Adria–Europe suture, Vardar Zone, Paleomagnetism, Thrusting, Vertical axis rotation

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • Open Educational Resources in Serbia

    Ivan Obradović, Ranka Stanković, Marija Blagojević, Danijela Milošević (2020)
    Open educational resources, BAEKTEL, Metadata portal
    ... use some of learning management systems in addition to traditional teaching. In recent times, OERs and MOOCs became more popular. Learners can use meta-portals for searching adequate OERs and after that improve their skills and competencies through OERs within the chosen platform. -OER initiative ...

  • Приказ резултата истраживања рудне жице 43 на хоризонту -100 рудника ''Леце''

    Цветковић Марко (2024)
    Лежиште олова и цинка са пратећим златом и сребром интезивно се експлоатише од 1953. године. Експлоатација се промењивим интезитетом одвијала до 2001. године, када престаје због организационо-финансијских проблема. После приватизације рудника Концерн ''Фармаком-МБ'' из Шапца постаје власник рудника и покреће низ активности на санирању стања и обнављању производње. Од 2010. године поново почиње интезивна експлоатација и прерада руде. Повод за анализу и разраду теме ''Приказ резултата истраживаља рудне жице не хоризонту -100 у руднику Леце'' јесте израда овог завршног ...
    лежиште Леце, рудничка геологија, рудна жица 43, квалитет руде, истражни ходници
    ... ycarnmammaBaHa . Cca BOJIHUHHOM, 21 MOPp(DOreHeTCKHM KapakTepHcTHMKaMa PJK-43, THMHOM Py}He MHHePpajbMH3aIHjC, BDpeJIHOCTHMA nucrpniOynje cajlpxxaja MeTana y py}lHHM TeJIHMa H Ba;KehHM IIpaBHJIHHIHMa O KtacH(DHKanujH H KareropMaarmMjH pe3cpBH yKJbyuyjyhM H BaxehH IIpaBHMHHHMK O KHacHQBHKamMjH H Ka ...

  • Geneza i uslovi cirkulacije voda kompleksnih karstnih sistema Kučajsko-Beljaničkog masiva

    Ljiljana M. Vasić (2017-07-14)
    postupaka koji je primenjen u cilju definisanja zona prihranjivanja i veze izmeđupodzemnih i površinskih voda, vremena koje voda provede u podzemlju, pri čemu seformira jedinstven hemijski sastav i temperaturni režim isteklih voda, bili su polaznaosnova za usmerenje na istraživanje karsta i definisanje teme doktorske disertacije.Kučajsko-beljanički masiv se nalazi u istočnoj Srbiji i pripada oblasti Karpatobalkanskogluka i idealan je poligon za istraživanje, obzirom da se u okviru njega nalazejaka karstna vrela i pojave toplih karstnih izvora na relativno malom rastojanju, ...
    karstni sistemi, geneza podzemnih voda, izotopske metode, starost voda,hidrogeohemijski procesi, dubina cirkulacije podzemnih voda, subtermalne i termalnevode
    ... deo sa prokapnim vodama, prelazni deo i deo sa aktivnom cirkulacijom podzemnih voda. Suvi deo, zapravo predstavlja potpovršinski deo, koji je najčešće suv, a sastoji se od velikog broja kaverni i kanala, koji u periodu velikih voda, sprovode vodu do prelazne zone. Prelazna zona predstavlja zonu u ...
    ... OGK iznosi i 1400 m. Karstni tip izdani formiran u okviru ovih tvorevina zauzima površinu od oko 1000 km2. Baza karstifikacije predstavlja prelaznu zonu koja se aproksimira površinom ispod koje se ne očekuje izražena karstifikacija (Milanović P, 1979). Utvrđivanje baze karstifikacije, kao ...
    ... reka i Bogovinska pećina bi se mogle izdvojiti kao sistemi sa dvojakom funkcijom, obzirom da obe pećine predstavljaju gravitacione izvore, kao i prelaznu zonu, odakle se jedan deo voda u pećini (Bogovinska pećina) dalje infiltrira u podzemlje i predstavljaju izvor prihranjivanja dubljih karstnih kanala ...