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Упит dcterms_subject_txt:Natural two dimensional materials

747 items

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... this research. Therefore, the examined rocks are suitable for use as dimensional stone, as natural stone slabs for architectural cladding and paving for exterior and interior use. With the actual national standards for natural stone products, designers and investors have lost the usability reference ...
    ... appli- cation of natural stone products. Therefore, for the sub- stantiated evaluation of usability we consulted the withdrawn national standard SRPS B.B3.200 (1994), which was also not obligatory, but had useful recommendations concerning the application of dimensional stone based on its ...
    ... direction, the river Tisnica splits the deposit in two (Fig. 1d). The exploitation takes place at a few exploitation levels on both sides of the riverbed covering an area of approximately 0.12 km? (Živković and Paunović 2000). Materials and methods Carbonate rocks collected from four different ...

  • A new evidence for pachyostotic snake from Turonian of Bosnia-Herzegovina

    Dragana Đurić, Dragoslav Radosavljević, Dragana Petrović, Miloš Radonjić, Petar Vojnović (2017)
    Фосилни налази морских змија из кредних седимената Босне и Херцеговине познати су од пре скоро сто година. У овом раду је приказан нови налаз пахиостотичне змије пронађене у локалном каменолому Дубовац, око три километра северозападно од Билеће. Примерак чини низ од 29 кичмених пршљенова од којих су седам изоловани из седимента. Међу изолованим пршљеновима два најочуванија су својим скоро четвртастим обликом слична пршљеновима Simoliophis rochebrunei али су неурални луци више отечени. Пршљенови и ребра показују висок степен пахиостозе као ...
    турон, Билећа, змије са ногама, пахиостоза, Pachyophis

  • Dvodimenzionalna geometrijska morfometrija prvih gornjih molara hominina sa teritorije Srbije - taksonomska i metodološka analiza

    Predrag N. Radović (2022)
    Primarni cilj ove studije tiče se taksonomske identifikacije fosilnih prvih gornjih molara (M1) hominina pronađenih u Srbiji, primenom metoda dvodimenzionalne (2D) geometrijske morfometrije. U prvoj (metodološkoj) fazi istraživanja ispitana je efikasnost 16 različitih pristupa (geometrijskih modela) u klasifikaciji M1 neandertalaca i anatomski modernog čoveka. Modeli su testirani na dva seta okluzalnih projekcija krunica (n = 34 i n = 64) dobijenih orijentisanjem digitalnih 3D modela u virtuelnom okruženju ili fotografisanjem fizičkih primeraka zuba. Prilikom testiranja primenjena je klasifikacija zasnovana ...
    2D geometrijska morfometrija, prvi gornji molar (M1), taksonomska identifikacija, neandertalci, anatomski moderni ljudi, Pešturina, Velika Balanica, Srbija

  • Microstructural and magnetic properties of electrospun hematite/cuprospinel composites

    Mira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić (2020)
    Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...
    Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic Materials

  • Improvement of geodatabase queries within GeolISS

    Ranka Stanković (2008)
    ... are used for linear features such as boundaries, tectonic structures, faults, fold access, dyke or vein. − Two-dimensional polygons are used for geographical features that cover a particular area of Earth's surface. Such features may include lakes, park boundaries, buildings, city boundaries, ...
    ... of geometry: − Zero-dimensional points are used for geological features that can best be expressed by a single reference point; in other words, a simple location. For example, the locations of wells, boreholes, structural measurement or stratification. − One-dimensional lines or polylines are ...
    ... maps can be derived. This requires a database design or data model that is sufficiently robust to manage complex geologic concepts such as three dimensional (spatial) and temporal relations among map units, faults, and other features. A geographic or geospatial information system (GIS) is a system ...

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases

    Nikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić (2021)
    The infuences of the application of mono- and two-component organic modifers on lipophilicity determination of 12 tetradentate Schif bases by reversed-phase thin layer chromatography were investigated. The main goal is to estimate types of interaction between observed compounds and components of the applied chromatographic systems and establish some behaviour pattern in order to easier choose a combination of organic modifers which will simulate interaction in biological systems based on the facts that the same basic intermolecular interactions are responsible ...
    Materials Chemistry, Industrial and Manufacturing Engineering, General Chemical Engineering, Biochemistry,General Chemistry

  • Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases

    Nikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić (2021)
    The infuences of the application of mono- and two-component organic modifers on lipophilicity determination of 12 tet radentate Schif bases by reversed-phase thin layer chromatography were investigated. The main goal is to estimate types of interaction between observed compounds and components of the applied chromatographic systems and establish some behaviour pattern in order to easier choose a combination of organic modifers which will simulate interaction in biological systems based on the facts that the same basic intermolecular interactions are ...
    Materials Chemistry, Industrial and Manufacturing Engineering, General Chemical Engineering, Biochemistry, General Chemistry

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... and enterprise staff involved in production of OER materials. As its third objective the project will produce course materials in several different languages, in various forms such as videos, audio streams and written material. The materials will be supported by electronic terminological resources ...
    ... Western Balkans. Another objective is to provide training for members of universities and enterprises for production of OER materials. The third objective is to produce materials in various languages, in video, audio and textual format, supported by electronic terminological resources, services, and ...
    ... the even wider open educational resources (OER) initiative, where materials are offered openly and freely to educators, students, and self-learners to use and reuse for teaching, learning, and research (Bissell, 2009). The materials are released under an open source license which permits their use ...

  • 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

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... units. Materials and methods The materials and methods chapter, and the results and dis- cussion chapter, follow Fig. 3, which displays the research workflow. Data sources, including multispectral satel- lite imaging, geophysical data, and geological data, are described in the materials and methods ...
    ... geophysics (magnetics and elevation), terrestrial geophysics (gravity data), and satellite multispectral data. The primary task involved a high-dimensional input space and a complex, variable set of data relationships. AIlI data were represented as raster data and used in the ML algo- rithm, regardless ...
    ... Although an effort was made to train and test the KNN model using only the five most informative features, as it operates more efficiently on lower dimensional data (i.e., with fewer features), it was ultimately exceeded by the RF model. However, in contrast to the KNN model, the RF model exhibits ...

  • Concepts for Improving Machine Learning Based Landslide Assessment

    Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić (2019)
    Katastar klizišta, Podložnost, Hazard, Mašinsko učenje, Uzorkovanje, Validacija

  • Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation

    Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer (2021)
    kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje
    ... patterning in 2D granular materials revealed by digital image correlation, Granular Matter, 12(1), 1–14. Hampel, A., Adam, J. & Kukowski, N., 2004. Response of the tectoni- cally erosive south Peruvian forearc to subduction of the Nazca Ridge: analysis of three-dimensional analogue experiments, Tectonics ...
    ... g the deformation of solid materials. Other studies derived decompositions of a 3-D deformation gradient into a succesion of a single, volume preserving extension, a simple shear, a rotation and a dilatation (Wang 1996), or alternatively, a dilation, a rotation and two simple shears (Zheng et al. ...
    ... 503(1–2), 8–17. Chen, Z., Schellart, W.P. & Duarte, J.C., 2015. Quantifying the energy dis- sipation of overriding plate deformation in three-dimensional subduction models, J. geophys. Res., 120(1), 519–536. D o w n lo a d e d fro m h ttp s ://a c a d e m ic .o u p .c o m /g ji/a rtic ...

  • 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
    ... for inclusion within the scope of regulation as naturally occurring radioactive materials (IAEA, 2013). Phosphate minerals, as a source of phospho- gypsum, have significant natural radioactivity, originating from natural radionuclides that are members of the ŠU and Th decay series. Sedimentary phosphate ...
    ... Fontana G. & Guazzelli M.A. (2018) Extraction of natural radionuclides in TENORM waste phos- phogypsum. Journal of Environmental Chemical Engineering, 6, 6664–6668. OECD (1979) Exposure to Radiation from the Natural Radioactivity in Building Materials. Report by an NEA Group of Experts. Organisation ...
    ... of agricul- ture, road construction, the cement industry and the manufactur- ing processes of other building materials is limited by the presence of the significant quantities of natural radionuclides, such as U, Ra and Th (Pćrez-Lopez et al, 2016). However, there is still a lack of information ...

  • Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević (2019)
    Изингов модел, критично понашање, танки системи

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... 0.04198 0.5 TOTAL 1322 Once the LCA results of two HSs are obtained, it can be made a comparison of two HSs. Also, it can be analyzed and determined the most significant phases of HS’s life cycle. To simplify results, only dominant materials of HSs which represent 90% of complete HSs were analyzed ...
    ... for the waste treatment scenario, it is assumed that 80% of the materials by mass will be recycled and the remaining 20% will be disposed of in a landfill. 3.2 Heating systems specification For the LCA of the individual HSs, two wood biomass-based HSs manufactured in Serbia, are chosen: firewood-based ...
    ... with the results of the GWP100 for two types of HS. In the presented tables, the most significant LC phases of HSs are estimated – production, transport, use4, and recycling and/or final disposal. Emission factors (emissions per unit of the physical weight of materials) are obtained from the Ecoinvent ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... the association of two brittle materials, i.e., a composite material, can give rise to a nonbrittle material which can resist fracture [1-3]. Defects no longer determine the ultimate strengith of such a material, and it becomes possible to predict the strength that these materials will be able to ...
    ... research, as this type of analysis has only been conducted to assess potential domestic uses (food residues). Materials 2020, 13, 3597 14 of 18 4. Conclusions Two types of raw materials have been identified in these archaeological asbestos-fiber-reinforced ceramic matrix composites, confirming ...
    ... Corsica have shown that these asbestos-reinforced artefacts have been produced at least since the Middle Materials 2020, 13, 3597; doi:10.3390/ma13163597 www.mdpi.com/journal/materials Materials 2020, 13, 3597 2of18 Ages in the northeast part of the island, where there are numerous ophiolite and ...

  • An Approach to Efficient Processing of Multi-Word Units

    Cvetana Krstev, Ivan Obradović, Ranka Stanković, Duško Vitas (2013)
    Efficient processing of Multi-Word Units in the course of development of morphological MWU dictionaries is not easy to achieve, especially when languages with complex morphological structures are concerned, such as Serbian. Manual development of this type of dictionaries is a tedious and extremely slow process. To alleviate this problem we turned to our multipurpose software tool, dubbed LeXimir, in the production of lemmas for e-dictionaries of multi-word units. In addition to that, we developed a procedure aimed at making ...
    Natural Language Processing, Grammatical Category, Lexical Representation, MWU, multi-word unit
    ... procedure cannot be applied. We will illustrate this with two examples. The nomi- nal MWUs petokraka zvezda ‘five-pointed star’ and Farenhajtov stepen ‘Fahrenheit degree’ consist of an adjective followed by a noun, which in Serbian is the natural order of an adjective and a noun in a MWU. However, these ...
    ... value f and in the second case the value m. An Approach to Efficient Processing of Multi-Word Units 5 The two possible orders of the adjective and the noun in the MWU are achieved with two separate paths in the graph, one for the order given by a lemma itself, and the other for the reverse order ...
    ... Gen="!$g" the rule is accepted only if a MWU consists of two nouns having different gender — in our example leptir ‘butterfly’ is masculine and kravata ‘tie’ is feminine. Example 3 (A rule for the class NC 2XN1, super-class NC 2XN — for two nouns separated by a hyphen and having different gender; ...

  • The state and perspective of the natural gas sector in Serbia

    Dejan Ivezić, Marija Živković, Dušan Danilović, Aleksandar Madžarević, Miloš Tanasijević (2016)
    The strategy of long-term energy development of Serbia identifies an increase of share of natural gas in final energy consumption as one of the main aims. Serbia has signed a strategic agreement with the Russian Federation on cooperation in the oil and gas sector, within which the project South Stream pipeline is planned to be realized. In addition, the Republic of Serbia has signed the Treaty that establishes the Energy Community and accepted the obligation to implement the Energy ...
    Consumption, natural gas, scenarios of development