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Упит dcterms_subject_txt:General Materials Science

841 items

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Using Metadata For Content Indexing Within An OER Network

    Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci (2014)
    ... entrepreneurial knowledge,by enabling higher education institutions to publish various academic learning resources e.g. video lectures, course planning materials, or thematic content, whereasenterprises can present different forms of expert knowledge, such as case studies, expert presentations on specific ...
    ... between academia and industry. At the same time, the Open Educational Resources (OER) movement, aimed at providing teaching, research and learning materials under an open source licence that permits their free use, access, repurposing, reuse and redistribution by others with limited or no restrictions ...
    ... Technology Enhanced Learning, http://www.baektel.eu) project was initiated with the main goal of building an OER networkofferingeducational materials by higher education (HE) institutions and best practice examples by enterprise experts. The network is conceived as multilingual, which means ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... hours (mh/year) 3127 2729 2639 3039 General repair (mh) 23638 18526 17389 19154 Average failures 3.42 2.64 4.98 4.34 Technical availability 0.89 0.89 0.81 0.81 Table 11. Results of the pair-wise comparison of exploitation sub-criteria: Working hours (WH), general repair (GR), average failures (AF), ...
    ... the production and may lead to breakdowns or endanger the people. In open-cast coal mines, dozers often work under aggravated conditions with the materials of different physical–mechanical qualities and under variable weather conditions. Under such circumstances the workload on the equipment significantly ...
    ... the production and may lead to breakdowns or endanger the people. In open-cast coal mines, dozers often work under aggravated conditions with the materials of different physical-mechanical qualities and under variable weather conditions. Under such circumstances the workload on the equipment significantly ...

  • Control of substructure construction of railways in the Republic of Serbia

    Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović (2022)
    Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...
    доњи строј, техничка регулатива, насип, збијеност, контрола
    ... improved layer made of coarse-grained gravel or sandy material and together with the protective layer forms frost protection [3:4-5]. Clay materials and materials that can be compacted and consolidated cannot be installed in the transition layer. The surface of the transition layer meets the conditions: ...
    ... [1:11-11]. 2.2. REGULATIONS FOR MAIN RAILWAYS ("OFFICIAL GAZETTE OF RS", NO. 100/2012) These Regulations define the minimum quality requirements for materials installed in the layers of the substructure. The minimum requirements are prescribed by the values of the degree of compaction Rc*, ie the values ...
    ... values of the deformability modulus Ev2 whose definition is contained in SRPS U.E1.010, ie in DIN 18134. The criteria to be met by the materials installed in the protective and transition layer are given in Table 2, while the criteria for embankments are given in Table 3. Table 2. Minimum value of de ...

  • 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
    ... 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 of the National Museum Kraljevo (abbreviated ...
    ... Dokmanovic, P., Jemcov, I., Milanovic, S., and Hajdin, B. 2003. Hydrogeological risk factors of dam and reservoir construction-case example Bogovina. Materials and Geoenvironment, 50(1):105-108. Eisenmann, V., Alberdi, M.T., de Giuli, C., and Staesche, U. 1988. Methodology, p. 1-71. In Woodburne, M. and ...
    ... view; indetermi- nate bovid left M1/M2 NMKVRS.P15 in (C) occlusal view. PALAEO-ELECTRONICA.ORG 11 rhinoceros remains unresolved, as does the more general issue of the phylogenetic relationships within the genus Stephanorhinus. Moreover, the genus Stephanorhinus is probably paraphyletic as currently defined ...

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... waves b) transversal waves Today, ultrasonic waves with frequency over 20 000 Hz are applied in elastic properties investigations of different materials, both in laboratories and „in situ“ conditions. At the end of the seventies in the last century for rock samples investigation (borehole core, ...
    ... u Beogradu – Rudarsko – geološki fakultet. JASIEHKO J. and STAWISKI B. (2001) Analysis of cracking plane geometry in old sandstone columns. Materials and Structures, 34, pp. 248–252. KAHRAMAN S. (2007) The correlations between the saturated and dry P-wave velocity of rocks. Ultrasonics, 46, ...
    ... investigation. Acknowledgement This paper is a part of the Projects ТR 36014 and ТR 33029 under the auspices of the Ministry of Education, Science and Technological Development, Republic of Serbia. REFERENCES ALEFELD G. and MAYER G. (2000) Interval analysis: theory and applications. Journal ...

  • 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

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer

    Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)
    ... 250m or even more (600m in Szeged). The well capacity ranges from 5 to 251s i, depending on geology, applied drilling techniclues, construction materials, well development and other factors 17]. In the past, many wel1s were over-pumped and forced beyond their optimal capacities, which caused them ...
    ... czoooo r000 0 *1000 *2000 r c -3000 o 9 -+ooo !) E -5000 -6000 -7000 -8000 *"l,o,Tio 75oooo Figure 4.9.2 Three-dimensional model and general cross section through the study area between Danube (Duna, in ihe west) and Tisa River (Tisza in the east). Note: 'Pannonian'layers are considered ...
    ... 10 Institute of Water Management "]aroslav eerni" (2004) Altemative Solulions in Water Suppl.ry of Vojvodina, Hydrod,ynamical Study, Ministry of Science Serbia, Belgrade (unpublished). 4.10 Transboundary Groundwater Resources Extending over Slovenian Territory Petra Meglib and Joerg PresI'or 4 ...

  • 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

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... Herzegovina belong to the in- tramountain system of lake deposition during Neogene times (i.e., in the Gacko Basin; Fig. 1C; Mandić et al., 2011). MATERIALS AND METHODS Samples Twenty representative outcrop samples from twelve loca- tions in East Herzegovina, between Nevesinje and Gacko in the north ...
    ... Herzegovina belong to the in- tramountain system of lake deposition during Neogene times (i.e., in the Gacko Basin; Fig. 1C; Mandi¢ et al., 2011). MATERIALS AND METHODS Samples Twenty representative outcrop samples from twelve loca- tions in East Herzegovina, between Nevesinje and Gacko in the north ...
    ... Geological Map of the Yugoslavia 1:500000. Institute for Geological and Mining Exploration and Investigation of Nuclear and Other Mineral Raw Materials, Belgrade. Ercegovac, M. & Kostić, A., 2006. Organic facies and palynofacies: Nomenclature, classi�cation and applicability for petroleum source ...

  • Particulate basalt–polymer composites characteristics investigation

    Todić Aleksandar, Nedeljković Blagoje, Cikara Dejan, Ristović Ivica (2011)

  • Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia

    Fen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • XRD and SEM analysis of urinary stones

    Miljević Miljana, Rosić Aleksandra (2010)

  • Mechanical Properties of Microwave sintered Hzdroxzlapatite (HAP)

    Mirković M., Došen A., Rosić Aaleksandra, Matović B. (2015)

  • Affordable Photogrammetry as Applied in the 3D Modelling and Monitoring of Underground Mining Exploitation and Transport

    Ristović Ivica, Vulić Milivoj (2014)

  • Structural, morphological and up-converting luminescence characteristics of nanocrystalline Y2O3:Yb/Er powders

    Mančić Lidija, Lojpur Vesna, Vulić Predrag, Rabanal Maria Eeugenia, Dramićanin Miroslav, Milošević Olivera (2012)

  • Mogućnosti primene tvrdih legura za sečiva bušaćih kruna u rudarstvu

    Bajić Sanja, Gaćina Radmila, Trajković Slobodan, Tokalić Rade (2012)