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Упит dcterms_subject_txt:raw material

345 items

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • Flyrock induced by blasting in surface mining

    Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)
    Miniranje predstavlja i dalje najefikasniji i najjeftiniji način eksploatacije velikih količina čvrstih mineralnih sirovina na površinskim kopovima. Energija eksplozije se koristi za fragmentaciju čvrste stenske mase do zahtevane granulacije. Pored pozitivnih efekata miniranja, postoje i određeni neželjeni efekti svakog procesa miniranja koji se mogu javiti, a to su: potresi tla, razletanje komada stene, vazdušni udari, otrovni i zagušljivi gasovi i prašina. Razletanje komada stene je nekontrolisano izbacivanje fragmenata odminirane stenske mase i predstavlja jedan od glavnih izvora materijalne štete ...
    razletanje, bušenje, miniranje, površinska eksploatacija, bezbednost, nesreća

  • Constitutive Model for Analysis of Long-Term Municipal Solid Waste Landfill Settlement

    Irena Basarić Ikodinović, Dragoslav Rakić, Mirjana Vukićević, Sanja Jocković, Jovana Janković Pantić (2022)
    Large long-term settlement occurs at the municipal solid waste landfills over an extended period of time which may lead to breakage of the geomembrane, damage of the cover systems, other protective systems or facilities constructed on top of a landfill. Also, municipal solid waste is an extremely heterogeneous material and its properties vary over location and time within a landfill. These material characteristics require the formulation of a new constitutive model to predict the long-term settlement of municipal solid ...
    constitutive model, finite element analysis, municipal solid waste, settlement

  • Hybrid Model for Optimisation of Waste Dump Design and Site Selection in Open Pit Mining

    Aleksandar Doderovic, Svetozar-Milan Doderovic, Sasa Stepanovic, Mirjana Bankovic, Dejan Stevanovic (2023)
    Waste management is an unavoidable technological operation in the process of raw material extraction. The main characteristic of this technological operation is the handling of large quantities of waste material, which can amount to several hundred million cubic metres. At the same time, this operation must comply with all administrative and environmental standards. Therefore, optimising waste rock management (particularly haulage and dumping) has the potential to significantly improve the overall value of the project. This paper presents a hybrid ...
    projektovanje odlagališta i izbor lokacije, hibridni model, optimizacija, genetski algoritam

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... s but are rich in ammon- ites. These layers are also very rich in calpionellids. 3. Material and methods The first ammonite material in this study was collected in 2007 by D. Rabrenović. Further material was collected in September 2021 and May 2022 by the authors of this contribution and colleagues ...
    ... them are shown in Figs 4—6. The present aptychi are determined at the species level. They are shown in Fig. 6. Identification of the studied material is usually difficult by the juvenile size of the specimens, the accompanied planar deforma- tion or lateral deformation, the unknown shape of the ...
    ... shells. Where possible, the number of ribs at the umbilicus and by the ventral side was counted on half of the whorl. The studied and illustrated material is housed in the Geological Museum, Department of Geological Engineering, VSB — Technical University of Ostrava, Czech Republic. 4. Taxonomy ...

  • From post-disaster landslides inventory to open landslides data

    Biljana Abolmasov, Miloš Marjanović, Uroš Đurić, Jelka Krušić (2021)

  • Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia

    Predrag Radović, Miloš Radonjić, Emmanuel Billia (2020)
    Finds of Pleistocene rhinoceros are rare in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East ern Serbia). Both the morphological and metric characteristics of the teeth are consis tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no ...
    rhinoceros, Stephanorhinus hundsheimensis, Serbia
    ... primary geological context of the fossils could not be determined, the fossil material from Bogovina Cave is nevertheless important due to the scarcity of rhinoceros fossils from Serbia. MATERIALS AND METHODS The fossil material from the locality of Bogov- ina Cave (Serbia) is stored in the collections ...
    ... only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East- ern Serbia). Both the morphological ...
    ... morphological and metric characteristics of the teeth are consis- tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no firm basis for dating. However, a potential association with a caballoid horse tooth could hint ...

  • Connections between the Levant and the Balkans in the late Middle Pleistocene: Archaeological findings from Velika and Mala Balanica Caves (Serbia)

    Dušan Mihailović, Steven L. Kuhn, Katarina Bogićević, Vesna Dimitrijević, Ana B. Marín-Arroyo, Jelena Marković, Norbert Mercier, Bojana Mihailović, Mike W. Morley, Predrag Radović, William J. Rink, Senka Plavšić, Mirjana Roksandić (2022)
    Major changes in the technological, economic, and social behavior of Middle Pleistocene hominins occurred at the onset of the Middle Paleolithic, 400e200 ka. However, until recently it was not possible to establish when, where, and how certain forms of Middle Paleolithic behavior appeared and spread into Southeastern Europe, mainly owing to gaps in the Paleolithic record. Here we report new results of dating, material culture, and the archaeological context of finds from the Balanica Cave Complex in Sicevo (Serbia). ...
    Neandertalci, starija Kina tehnologija, jabrudijen, populaciona kretanja, kulturni prenos

  • 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

  • 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
    ... The activity concentration of *Ra in recrystallized gypsum is ~6 times lower than in raw phosphogypsum. Therefore, recrystallized gypsum does not present a radiation hazard when used as a building material, while raw phosphogypsum meets the requirements only for road construction materials. Keywords: ...
    ... all of these requirements and presents no radiation hazard when used as a building material, while raw phosphogypsum from the Elixir Prahovo waste landfills can be directly used only as a road construction material. “Samples measured before the sealing.of sample container. Acknowledgements. The ...
    ... million tons are produced in China and 40 million tons are produced in the USA (IAEA, 2013). Raw phosphogypsum is generally yellowish, which, along with its greyish grains, defines it as a low-grade gypsum material in traditional applications, such as in cements and mortars (Costa et al., 2019). Primary ...

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... succession. Furthermore, the col- lected palaeobotanical material is compared to similar Mississip- pian floras of Europe. Based on the studied sedimentary features and the position and mode of preservation of the palaeontological material, the Ko- stadinovica succession is interpreted as an distal ...
    ... system. As the hyperpycnal flows oc- cur during high river discharge into the basin they represent an efficient mechanism of transfer of clastic material from continen- tal environments to the deep-marine realms (MULDER & SY- VITSKI, 1995). The characteristics of hyperpycnites (deposits of hyperpycnal ...
    ... used for the determination of lithofacies and their internal relation- ships. Observed sedimentary characteristics along with palaeon- tological material from the site were further compared to criteria for the genetic model of extrabasinal turbidites (ZAVALA & PAN, 2018) with the aim of better un ...

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... the hoarded material and accounting for the time and funding aspect, this kind of method was a logical choice. 2D geoelectrical resistivity tomography … 61 Figure 1 Satellite image of the surveyed field (Google Earth) Accounting for the occurrence of the subsurface material (anthropogenic) ...
    ... geotechnical profile (borehole data). Four boreholes confirmed the presence of decomposed waste material as well as a sand lens and surface embankment layer consisting of previous construction material. Like the previous section (Figure 4), the decomposing waste is represented as a distinctive laterally ...
    ... methane, hydrogen-sulfide, carbon-dioxide and carbon-monoxide. Based on the research of the disposed waste origin and the knowledge of building material production during the twentieth century, there exists a founded assumption of environmental pollution with fiber (asbestos) silicates which increase ...

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... chemical composition of the material, the increasing amount of waste, and the mismanagement of recovery and reclamation of ponds, these ponds have become a significant element of negative impact on the surrounding ecosystem. Economics was behind the discharging of this material, resulting in tailing ponds ...
    ... expansion of these five tailing ponds, material was transported hydraulically and deposed physically by hydrocyclone. The landscape where the tailings are situated is the Ibar River’s alluvial plain [12]. Since the tailing deposits have not been rehabilitated, the material from the deposits have scattered ...
    ... about the current conditions of the landfill, characteristics of the deposed material and environmental impact assessment analyses is also a concern. Important environmental aspects (air, water, soil), character of deposed material (chemical, quantities and other), elements with special value in their e ...

  • Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles

    Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)
    Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... 2] (L = imidaz- ole or indazole) [21] and [HL]trans-[RuCl4(DMSO-S)L] Electronic supplementary material The online version of this article (doi:10.1007/s00706-013-1044-1) contains supplementary material, which is available to authorized users. A.M.Mijatović � J. Bogojeski � Ž. D.Bugarčić � B. Petrović ...
    ... obtained results are given in the Supplementary material (Table 1S; Fig. S1). All kinetic experiments were per- formed under pseudo first-order conditions, where the concentration of nucleophiles was always in at least tenfold excess (Supplementary Material, Tables 2S–5S). Substitution reaction of selected ...
    ... three different temperatures. Values for kobsd as a function of different ligand concentrations and temper- ature are given in the Supplementary material (Table 4S). Calculated values for the rate constants at 288 and 298 K are k1 288 = 0.31 ± 0.02 M-1s-1 and k1 298 = 0.92 ± 0.04 M-1 s-1. Finally ...

  • Project REASONING: Characterization and technological procedures for recycling and reusing of the rudnik mine flotation tailings

    Vesna Cvetkov, Vladimir Simić, Stefan Petrović, Filip Arnaut, Milena Kostović, Dragan Radulović, Jovica Stojanović, Vladimir Jovanović, Dejan Todorović, Nina Nikolić, Jelena Senćanski, Grozdanka Bogdanović, Dragana Marilović (2024)

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... include classroom material, such as lecture notes or exercises, but also all sorts of relevant additional material, such as external links, audio and video files, animations, etc. Activities include assignments, quizzes, glossaries, forums, wiki pages and the like. The course material is organized ...
    ... InfoTeh course was created encompassing course material for several postgraduate courses: Databases, Intelligent decision support systems, Information system design, and GIS (Geographic Information System) technologies. InfoTech course material is hence not organized on a weekly basis but rather ...
    ... working on an individual computer under the supervision of a teacher or teaching assistant. Organization of educational content The course material is grouped by instructional weeks (Figure 4), and is made available to students several days before each instruction class, so that the students ...

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе
    ... rough estimation and published scientific researc the type of movement more common types are slides, flows and falls. type of material involved there are all types of material: rocks, de Landslides can be caused by one or more factors of which mo geological and engineering geological are main causal ...
    ... a rough estimation and published scientific resear the type of movement more common types are slides, flows and falls type of material involved there are all types of material: rocks, Landslides can be caused by one or more factors of which m geological and engineering geological are main causal factors ...
    ... ›������ [7]. ������ 1. ��� ���›����� ����� � �� [4] [5] �������� ›������ (���. type of movement) �� �� ��›������� ���������� (���. type of material) ����� (���. rock) ��� (���. soil) ������� (���. debris) ��� (���. soil) ���������� (���. falling) �����  ����/ �. �� � (���. rock fall) ����� ...

  • 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