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Упит dcterms_subject_txt:raw material

346 items

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... https://doi.org/10.1016/j.jhazmat.2006.03.009 Acce pted M anuscr ipt J. Serb. Chem. Soc. 00 (0) S1–S2 (2021) Supplementary material S1 SUPPLEMENTARY MATERIAL TO Some examples of interactions between certain rare earth elements and soil ZLATKO NIKOLOVSKI1, JELENA ISAILOVIĆ2*, DEJAN ...
    ... article as Z. Nikolovski, J. Isailović, D Jeremić, S. Kovač, I. Brčeski, J. Serb. Chem. Soc. (2021) https://doi.org/10.2298/JSC211006095N This “raw” version of the manuscript is being provided to the authors and readers for their technical service. It must be stressed that the manuscript still ...
    ... working with medium and high concentrations.14 Sequential extraction (SE) was used for desorption of these elements from the soil. EXPERIMENTAL Material and method The soils used for the analysis are: humus, clay and sand type of soils. The soil fractions do not mutually differentiate as per the ...

  • Korelacija magnetnog susceptibiliteta i sadržaja metala u flotacijskom jalovištu

    Filip Abramović, Vesna Cvetkov, Aco Ilić, Dragana Životić (2022)
    Procena metala u rudama, jalovištu i zemljištu se tradicionalno određuje hemijskim metodama kao što su Rengen fluorescentna analiza (XRF), Instrumentalna neutronska aktivaciona analiza (INAA) i Masena spektrometrija induktivno spregnute plazme (ICP-MS). Neke od pomenutih metoda su veoma zahtevne i skupe, te se nametnula potreba ka traženju jeftinijeg alata za brzu procenu prisustva pojedinih metala. Tokom poslednjih nekoliko decenija, mnoge studije su pokazale da su magnetna merenja dovoljno osetljiva da detektuju magnetni signal feromagnetnih materijala, a samim tim i metala ...
    flotacijsko jalovište, makroelementi, magnetna merenja

  • 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
    ... the presence of non-crys- talline inorganic material. Determination of the pH, the conductivity and the UV absorbance of aqueous leachates give hints on the forms of functional groups on chars, soluble inorganic matter and elutable organic material oflower molecular weight. The results support ...
    ... also milled long time ago yielded different results. The composition found at the outside of the original material might be less representative than the composition found for the ground material, because it might not be representative for the surface functional groups in the pore space. XPS can also ...
    ... bonization of biomass has found major interest in the last decade as a source for bioenergy [8], for the production of a valuable carbonaceous material (biochar) and as a means for carbon sequestration [9,10]. Meanwhile thousands of articles are available on the production, use and modification ...

  • Replica of the “Great Triangle Gold Nugget” Belonging to Belgrade University Collection, Gilded or Not?

    Alena Zdravković, Maja Milošević, Ivana Jelić (2021)
    ... colour surface. Since the gold colour and shine remained the same, did not darken by the time it was assumed that the model is gilded. Material and method Chemical composition of the gypsum model surface was carried out in the Laboratory for SEM, Faculty of Mining and Geology, University ...
    ... nugget (Archive of the Collection of Rocks and Minerals), but with no information of the number of the replica made, and the type and manner of material that was used for covering. Result and conclusion The data obtained by EDS analysis show that the gypsum model is covered with gold leaf ...

  • Water Evacuation from the “Sarića Osoje“ Municipal Waste Landfill of Užice

    Šušić Nenad, Rakić Dragoslav, Đoković Ksenija, Berisavljević Dušan (2012)

  • Impact of the variability of technological parameters on the effective reclaiming capacity of bucket wheel reclaimers

    Komljenović D., Nurić S., Kričak Lazar, Pantelić M. (2012)

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... analyses of lignite ashes show that mineral matter in the coal seam I (Table 3; Figs. 2, 3; Table S­II of the Supplementary material; Figs. S1, S2 of the Supplementary material) consists mainly of anhydrite (13.10– 52.28%), quartz (3.97–52.61%) and illite/smectite (12.05–46.66%) with variable proportions ...
    ... crystals of irregular shapes. Sulphates, anhydrite (CaSO4; Fig. 4f) possibly gypsum as well, were determined in high amounts in several samples. In raw lignite, sulphate minerals are authigenic (mainly epigenetic) and/ or occur as weathering products. Barite (BaSO4; Fig. 4g) was de­ termined in very ...
    ... KB­79 and KB­ 91 from the B field, Kovin deposit, as described in detail in MITROVIĆ et al. (2016, 2017; Fig. 1; Table S­I of the Supplemen­ tary Material). The samples represent different lithotypes and parts of coal seams I, II and III (Figs. 2 & 3). 3.2. Lithotypes and maceral analyses The id ...

  • Failure Estimation of the Majdanpek Open Pit East Face Based on Inverse Velocity Model

    Miloš Marjanović, Stefan Milanović, Nikola Simić, Lazar Kričak (2024)
    The Majdanpek open pit mine south district is currently active mining prospect of copper ore exploitation in eastern Serbia. Its depth is approaching the termination depth and occurrences of large-scale instabilities and global instability of the final pit slope is possible. These can generate catastrophic mass movement inside an area that encloses a regional road route and the Pek River bed which is channelled along the outer contour of the pit. The displacements that were noted in early 2023, in the ...
    displacement, survey, inverse velocity, open pit

  • Cutting elements of bucket wheel excavators in lignite opensast mines: Methodology and performed solutions

    Dragan Novaković, Predrag Jovančić (2016)
    Bucket and cutting elements geometry (teeth and hardened steel) have very powerful impact on effective operation of bucket wheel excavator, and that`s why, problems of optimal geometry of elements in specific conditions always are of special interest in mining science and technique. If we want to achieve satisfactory utilization of bucket wheel excavator, it is necessary to modulate geometry material characteristics and technological parameters, as regards bucket wheel excavator work regime, and bucket wheel working performances, and also bucket ...

  • 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
    ... or as raw materials for the production of building materials. The results were compared with the average results of previous tests in order to determine changes. Pozzolanic properties are tested acording to standard SRPS B.C1.018 2001 [15] due to which the class of pozzolanic material has been ...
    ... Classes of pozzolanic material are obtained by testing the samples to compressive strength and tensile strength in bending after 7 days. Pozzolanic properties of the fly ash determined by mechanical properties are the most important in the application of ash as road-building material. Mechanical properties ...
    ... properties are the most important in the application of ash as road-building material. Depending on the minimum compressive strength and tensile strength in bending after 7 days of making samples, three classes of pozzolanic material can be identified as given in Tab. 5. The composition of pozzolan mainly ...

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... shape of the deposit and raw material quality) defines an almost uniform testing methodology, leaving the responsible designers without the opportunity to apply their knowledge and experience on a particular deposit, type of raw material or even a certain quality (grade) of raw ma- terial. Resources ...
    ... Kasaš, K.; Simić, V.; Ranogajec, J.; Bačkalić, Z.; Popov, K.; Životić D. Mineral-raw material complex of the brick and ceramic industry: Current situation, current problems, research, trends. In Mineral and Raw Material Complex of Serbia and Montenegro; Vujić, S., Ed.; Belgrade, Serbia, 2003; pp. 390–403 ...
    ... and ceramic clays. This is not rational if it is known that ceramic and refractory clays everywhere in the world represent a far more valu- able raw material than brick clays. The recommended distances between boreholes for brick clays should be at least 50% longer than the existing ones. In the case ...

  • Investigating distant effects of the Moesian promontory: Brittle tectonics along the western boundary of the Getic unit (East Serbia)

    Ana Mladenović, Milorad D. Antić, Branislav Trivić, Vladica Cvetković (2019)
    In this study, we report evidence for brittle deformation in a part of the Carpatho–Balkan orogen, which is explained in terms of effects of the rigid Moesian promontory of the European plate on fault kinematics in East Serbia. We focus on the westernmost part of the Getic Unit of the East Serbian Carpatho–Balkanides, i.e. the Gornjak–Ravanica Unit, located between two main thrusts that were repeatedly activated from Early Cretaceous to recent times. We combine a new data set on ...
    Getikum, Mezijska jedinica, Karpato-balkanski orogen, krte deformacije, Gornjačko-ravanička jedinica

  • Cytotoxic activity of tetradentate Schiff Base Copper(II) complexes

    Nevenka Gligorijević, Aleksandar Mijatović, Sandra Aranđelović, Rada Baošić (2021)
    Istraživanje kompleksa bakra kao potencijalnih antikancerogenih agenasa nudi ohrabrujuće perspektive u odnosu na komplekse platine (II) računajući na smanjenu toksičnost, novi mehanizam delovanja, različit spektar aktivnosti i perspektivu neunakrsne rezistencije. Kompleksi Šifovih baza bakra(II) koji sadrže tetradentatne ligande acac2en tipa (acac2en (1); tfacac2en (3), acactfacacen (4), acacphacacen (6)) pokazali su važnu antioksidativnu aktivnost, visok potencijal za interakciju sa HSA i DNK, u prethodnim studijama. Zbog toga je bilo interesantno ispitati i uporediti potencijal antikancerogene aktivnosti in vitro, u odnosu ...
    Bakar(II) kompleksi, citotoksičnost, ćelijski ciklus

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... Milena Rosićl, Maja Miloševićz, Maria Čebela!, Vladimir Dodevskil, Vesna Lojpur', Radomir Ljupković“, Aleksandra Zarubica“ ]Laboratory_fbr Material Science, Institute of Nuclear Sciences ,, Pinča , National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 2522, 11001 Belgrade ...
    ... this paper, as well as a potentially new approach in the methodology of inorganic synthesis. During photocatalytic · testing nanostructured material CopoHoo,MoOu indicated the possibility of a promising solution in photocatalytic processes towards green chemistry and sustainable development ...

  • Geomechnical research for the new bucket wheel excavator testing at Open pit “Filijala”

    Vladimir Čebašek, Nebojša Gojković, Veljko Rupar, Miodrag Pribićević (2020)
    Since 1976 cement marl excavation at open-pit mine „Filijala” is carried out by continuous exploitation technology using bucket wheel excavator SH 400 manufactured by Orenstein und Koppel (O & K) company. Due to the bucket wheel excavator time-worn and high operating cost it was necessary to replace it with new one. In order to test the new bucket wheel excavator and prove its capacity a testing zone was defined as test block for excavation, in which the bucket wheel ...
    отпор на копање, лапорац, роторни багер

  • 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

  • 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

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Structural characterization of traditional pottery produced from local clay, Rujište (Ražanj, Central Serbia), in an effort to preserve its geoheritage

    Maja Milošević, Biljana Đorđević, Alena Zdravković (2021)
    ... bread-baking pan called crepulja, prepared with raw local clays from Ražanj area in western Serbia, without any additional tempers added. Pottery manufacture with these specific raw materials and the final function of the product is closely connected, when material dictates technique. Production of pottery ...
    ... Nothing else can be made from these raw clays, nor can these pots be made with the help of a mechanical device – a potter's wheel, which was empirically tested over the years. Investigation of the pottery was conducted to show the main characteristics of the raw clay body based on mineralogy and ...
    ... cathodoluminescence detector (CL) were applied to determine the morphology and grain size assessment of minerals as well as their chemical composition. Raw clay, from which investigated sample of pottery was produced, largely falls under Neogene sediments which are extensive in the area of Ražanj. Investigated ...