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330 items

  • 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)

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Dosadašnja saznanja o bijelim boksitima na prostoru Crne Gore

    Mia Jovanović, Slobodan Radusinović, Vladimir Simić (2023)
    bijeli boksit, geološka istraživanja, geologija, geohemija

  • Употреба веб платформе Омека за дигиталне библиотеке из домена рударства

    Александра Томашевић, Биљана Лазић, Далибор Воркапић, Михаило Шкорић, Љиљана Колоња (2017)
    У овом раду биће представљена Омека, веб платформа за приказивање дигиталних колекциjа и систем за управљање њиховим садржаjем. Њену примену у области техничких наука, а конкретно у области рударства, приказаћемо на примеру дигиталне библиотеке ROmeka@RGF. За Омеку смо се определили првенствено због чињенице да jе jедноставна за коришћење, има обимну пратећу документациjу и не захтева уско специфичне информатичке вештине што jе чини приступачном за већину корисника, а нарочито за рударске инжењере, коjима jе ова дигитална библиотека првенствено намењена. Документа ...
    Омека, дигиталне библиотеке, рударство

  • Multiphase evolution of fluids in the Rudnik hydrothermal-skarn deposit (Serbia): new constraints from study of quartz-hosted fluid inclusions

    Stefan Petrović, Ronald J. Bakker, Vladica Cvetković, Rade Jelenković (2024)
    This study presents and discusses first detailed petrographic, microthermometric and Raman spectroscopic data from quartzhosted fluid inclusions at Rudnik Zn-Pb-Cu-Ag skarn deposit (Serbia) and combines them with the information on skarnand ore paragenesis. Three periods in the metamorphic-hydrothermal history of the deposit are recognized: 1) the pre-ore prograde skarn period when garnet-clinopyroxene skarns formed, 2) the syn-ore period that encompasses a retrograde stage marked by epidote and zoisite and a quartz-sulfide stage characterized by quartz, pyrrhotite, sphalerite, galena and ...
    skarnovska ležišta, rudnik, fludine inkluzije, srpska kenozojska magmatska provincija, Zapadno Tetisjki metalogenetski pojas
    ... epidote-rich skarn q in retrograde skarn in association with sulfide ore minerals c i infow of meteoric water — - offluids. formation of diatre boiling of fluid and inflow of meteoric water hydrothermal pulse rich in gaseous Fig.12 A simplified model of hydrothermal fluids evolution and their ...
    ... Faculty of Mining and Geology, University of Belgrade, Đušina 7, 11000 Belgrade, Serbia Department of Applied Geosciences and Geophysics, Chair Resource Mineralogy, Montanuniversity, 8700 Leoben, Austria Published onlinc: 08 June 2024 2006; Chang et al. 2019). These deposits are closely related ...
    ... and microthermometry of fluid inclusions These investigations are conducted at the Department of Applied Geosciences and Geophysics, Chair of Resource Mineralogy at the Montanuniversity of Leoben (Austria) and at the Fluid inclusion Laboratory at the Faculty of Mining and Geology of the University ...

  • Природни потенцијал минералних вода Србије - Natural potential of mineral waters in Serbia

    Оливера Крунић (2021)
    минералне воде
    ... one of the most water-scarce countries in Europe, with extremely unfavorable, uneven water regimes. And that in accordance with that fact, everyone must act di¯erently both in reference to water and the space that is necessary for the expansion of water management systems. ¦e “resource paradox” only ...
    ... a di­culty renewable resource in the sustainable agriculture concept 175 БРАНИСЛАВ ЂОРЂЕВИЋ Стратегија развоја водопривредне инфраструктуре Србије у светлу чињенице да је она водом врло сиромашна и да су водни режими изузетно неповољни 177 BRANISLAV ĐORĐEVIĆ Serbia’s water resources infrastructure ...
    ... Selection of soils and water requirements for vegetables 275 ДРАГАН ТЕРЗИЋ, МИЛОРАД СТОШИЋ, РАТКО ЛАЗАРЕВИЋ Травњаци, недовољно искоришћени ресурс Србије: ограничавајући фактори и могућности унапређења 277 DRAGAN TERZIĆ, MILORAD STOŠIĆ, RATKO LAZAREVIĆ Grasslands, an underutilized resource of Serbia: limiting ...

  • Arhitektonsko-građevinski kamen Crne Gore, stanje i potencijali

    Darko Božović, Vladimir Simić (2023)
    arhitektonsko-građevinski kamen, rezerve, kvalitet, potencijalnost

  • Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema

    Svetlana M. Štrbac-Savić (2016-06-10)
    Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...
    podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala

  • Bioleaching Process for Copper Extraction from Waste in Alkaline and Acid Medium

    Ivica Ristović, Darina Štyriaková, Iveta Štyriaková, Jaroslav Šuba, Emilija Širadović (2022)
    Flotation wastes are becoming a valuable secondary raw material and source of many metals and semimetals worldwide with the possibilities of industrial recycling. The flotation tailings contain oxide and sulfide minerals that have not been sufficiently stabilized and form acidic mine waters, which in turn contaminate groundwater, rivers, and reservoi6sediments. An effective way to recycle these mine wastes is to recover the metals through leaching. While the focus is on acid bioleaching by iron- and sulfur-oxidizing bacteria, alkaline leaching, ...
    bakar, alkalno, kiselo bioluženje, sekundarne sirovine

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... processes and handles large volumes of data. Analyzing large datasets can be challenging, but it can significantly aid in decision-making and resource management. In the analysis of dynamometric cards for hundreds or thousands of wells, visual classification is impractical and requires substantial ...
    ... AutoML. The evaluated metrics were accuracy, precision, recall, FI macro, and MCC. Table 2 displays the names and labels used for each experiment. Resource Tag Fourier descriptors Fourier Wavelet descriptors Wavelet Load values Loads Decision tree DTree Random forest RandomF XGBoost XgB ...
    ... detecting issues with submersible pumps in various industrial applications. In power plants, these sensors enable precise measurement of pressure in water supply systems and condensers, which is essential for the safety and efficiency of submersible pump operations. Proper pressure monitoring allows ...

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... Rcejected ·L„·l — Electtolysis: —> \.nu Ca(OH) c t >—< CaCO, Desalination —— Fresh water :I“"”:" —E y utilization MACO. [ , Sulfur Nea water l?uullnn/.m w — — CaSO, utilization Flue un(( O„SO,) —— Water treatmeni —— HBauification — Gas treatment — Utilization Figure 3.2 Desalination process ...
    ... injection [2]. As formation water becomes saturated with dissolved CO- the density rises and sinks in the reservoir, a process that effectively stores the CO-. The rate of dissolution depends on the amount of mixing of CO- and formation water. Diffusion of CO into the water is assisted by accumulations ...
    ... this, a hydrostatic column is formed in the well. For each compression stage water is knocked out at 30%C. Since the ability to dissolve water is lower at 32 bar (third stage) than at the wellhead, there is no free water at the wellhead therefore limiting any corrosion and hydrate formation. To be ...

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Vodosnabdevanje i održivo upravljanje podzemnim vodnim resursima u Srbiji

    Dušan Polomčić, Zoran Stevanović, Dragoljub Bajić, Bojan Hajdin, Vesna Ristić-Vakanjac, Petar Dokmanović, Saša Milanović (2012)
    Slično većini evropskih zemalja, udeo podzemnih voda u javnom vodosnabdevanju u Srbiji je oko 75%. Najveće rezerve su akumulirane u vodonosnim naslagama intergranularne poroznosti neogene i kvartarne starosti, kao i u karstnim izdanima. One su jedini izvor vodosnabdevanja pijacom vodom za Vojvodinu i veći deo Srbije. Delovi sa malim rezervama podzemnih voda su Šumadija i južni delovi zemlje, gde se koriste u većoj meri površinske vode. Do sada izvedena hidrogeološka istraživanja pokazuju da se zahvata oko 30% obnovljivih rezervi ...

  • Remontni radovi u bušotini sa dubinskom pumpom

    Jovana Milošević (2024)
    Remontni i stimulativni radovi u naftnom inženjerstvu su radovi koji se primenjuju na bušotinama koje su već u proizvodnji ili potencijalno proizvodnim bušotinama, i u zavisnosti od toga imaju različitu svrhu. Remontni radovi predstavljaju sve radove koji su ograničeni na kanal bušotine, dok se stimulativni radovi odnose pribušotinsku zonu.U prvom slučaju remontni i stimulativni radovi kod proizvodnih bušotina služe za otklanjanje problema i povećavanje proizvodnje bušotine. Dok u drugom slučaju, kod potencijalnih bušotina su ovi radovi namenjeni završnim obradama ...
    remontni radovi, hemijska obrada, Gravel Pack, alat za instrumentaciju, puške za perforaciju
    ... i-Appah/bffcd6dbeefe6c91fd3056a9e354320f1 38ea608 slb. (2015). Preuzeto sa The Defining Series: Perforating Fundamentals: https://www.slb.com/resource-library/oilfield-review/defining-series/defining-perforating Soleša, M. (1996). Optimizacija remontnih i stimulativnih radova. TerraPERM prop ...

  • Hidrogeološke i hidrohemijske karakteristike pojave termomineralnih voda u reonu Volkovo (Skoplje - Republika severna Makedonija)

    Hristina Petrova, Katarzyna Wątor, Ewa Kmiecik, Piotr Rusiniak, Boris Vakanjac, Vesna Ristić Vakanjac, Dimitar Petrov (2024)
    Kao rezultat tektonskog sklopa i litološko-geološkog sastava, na teritoriji Republike Severne Makedonije registrovan je veliki broj pojava termalnih, mineralnih i termomineralnih voda (T, M i TM voda). Dosadašnja hidrogeološka i hidrohemijska istraživanja ovih voda vršena od strane pojedinih autora sa ciljem da se definiše njihov lekoviti faktor kao i za potrebe banjskog turizma. Sprovedena istraživanja su, dakle, bila lokalnog karaktera i bila su vezana za njihove značajnije pojave. Tokom 70-tih godina prošlog veka, Kotevski je za potrebe izrade doktorske ...
    termomineralne vode, hidrohemijskie karakteristike, lekoviti faktor voda, Valakonje, Republika Severna Makedonija

  • Review of the Failure at the Flotation Tailings Storage Facility of the “Stolice” Mine (Serbia)

    Dragana Nišić, Nikoleta Aleksić, Bojan Živanović, Uroš Pantelić, Veljko Rupar (2024)
    flotacijsko jalovište, rudnik "Stolice", udes, posledice, GITSM