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Упит dcterms_subject_txt:method of least squares

2837 items

  • 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

  • Simple 2D Gravity-density inversion for modeling of the sedimentary basin basement

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić, (2019)

  • An Approach to Development of Bilingual Lexical Resources

    Stanković Ranka, Obradović Ivan, Trtovac Aleksandra (2012)
    ... University of Belgrade Faculty of Mining and Geology Đušina 7, Belgrade Serbia +381 11 3219 148 ranka@rgf.bg.ac.rs Ivan Obradović University of Belgrade Faculty of Mining and Geology Đušina 7, Belgrade Serbia +381 11 3219 259 ivano@rgf.bg.ac.rs Aleksandra Trtovac University of Belgrade ...
    ... . The fourth section outlines the usage of the system with examples illustrating the development of Biblimir. 2. SYSTEM ARCHITECTURE Bibliša is a complex system composed of several modules. Targeted at textual resources in the form of collections of TMX documents and the corresponding metadata ...
    ... rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 101 An Approach to Development of Bilingual Lexical Resources ...

  • Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world

    Bogoljub Vučković, Bojan Dimitrijević (2023)
    The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...
    lignite, heavy metals, concentrations
    ... productive humus layer of the soil that are at the top of the sedimentation sequence of this area. 181 3. COMPARATIVE PRESENTATION OF THE CONTENT OF HM IN THE LIGNITE OF THE BASIN AND SELECTED EXAMPLES - SERBIA, REGION, EUROPE AND THE WORLD For easier understanding of the content of these HM, we performed ...
    ... the geochemical characteristics of coal seams and perform a comparative analysis of coal af}ectation on the environment. P/ith 155 analyzes of HM from coal, 45 from ash, 165 from gravel and 30 from soil, we perform analysis of horizontal and vertical distribution of HM and comparative analysis. B/hat ...
    ... General view of the vertical distribution of Zn, Pb and Cu in the lithological suite of the Kostolac-Kovin coal-bearing basin; blue - coal, vellow — waste The conclusion is that the contents of Zn, Pb and Cu in coal are generally significantly lower than those registered in the sediments of the tailings ...

  • Actual contamination of the Danube and Sava rivers at Belgrade (2013)

    Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)
    rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening
    ... Bor, University of Belgrade, Serbia, 5Laboratory for Environmental Research, University of Nova Gorica, Slovenia, 6Faculty of Science, University of Novi Sad, Serbia, 7Faculty of Science and Mathematics, University of Niš, Serbia, 8Faculty of Science and Mathematics, University of Kragujevac, Serbia ...
    ... JAN SCHWARZBAUER9* 1School of Science, University of Greenwich, England, UK, 2High Business-Technical School, Užice, Serbia, 3Faculty of Chemistry, Brno University of Technology, Czech Republic, 4Faculty of Technology and Metallurgy, Faculty of Chemistry, Faculty of Mining and Geology, Technical ...
    ... 5 mL of ethyl acetate and 5 mL of methanol and washed with 10 mL of Milli-Q water. Then 400 mL of river water was loaded under moderate flow (3 mL min-1). SPE cart- ridge was subsequently dried under vacuum for 20 min and then the hormones were eluted with 6 mL of a mixture of ethyl acetate and methanol ...

  • Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex

    Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males (2024)
    Timok Magmatic Complex, Neotethys subduction, basin geodynamics, analogue modelling

  • Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study

    Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović (2019)
    Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...
    tecišta, modeliranje, RAMMS, DEM
    ... conditions, since such models implement physical principles, like the conservation of mass, momentum and energy of bulk mixtures (Rickenmann, 2005). In this paper, results of RAMMS debris-flow dynamical method are tested, based on Voellmy (1955) approach, which was specially designed for snow ...
    ... rheological model. Method One of well used rheological model is Voellmy method (Voellmy, 1955) firstly used in snow avalanche models, which means that is basically one-phase. It is assumed that the initiation mass starts to move as a plug defining shear stress in different points of transportation ...
    ... path. RAMMS DBF software is FVM (Finite Volume Method) based software for modelling of debris flows. RAMMS was developed in 2005 by the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL, Birmensdorf) and the Swiss Federal Institute for Snow and Avalanche Research (SLF, Davos) ...

  • Geotechnical Conditions for Construction of Savski Trg Metro Station as a Part of the Belgrade Metro Line One

    Nemanja Stanic, Dragoslav Rakic, Josip Isek, Slavoljub Simic (2024)
    In order to solve serious traffic congestion in Belgrade, a number of studies regarding the Belgrade Metro construction have been carried out since 1973. However, only in 2019, the routes of the future metro lines 1 and 2 were de-fined as a part of the General Metro Construction Project. The lines are de-signed to intersect at the location of Sava Square, where an interchange met-ro station will be built. It represents a complex geotechnical structure consist-ing of three different ...
    metro station, geotechnical modelling, displacements

  • Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica

    Natalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel (2019)
    Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and Technology

  • GIS Application Improvement with Multilingual Lexical and Terminological Resources

    Ranka Stanković, Ivan Obradović, Olivera Kitanović (2010)
    ... professor, 3 researcher University of Belgrade, Faculty of Mining and Geology, Faculty of Mining and Geology E-mail: {ranka, ivano, olja}@rgf.bg.ac.rs Abstract This paper introduces the results of integration of lexical and terminological resources, most of them developed within the Human Language ...
    ... integration of lexical and terminological resources, most of them developed within the Human Language Technology (HLT) Group at the University of Belgrade, and the Geological information system of Serbia (GeolISS), developed at the Faculty of Mining and Geology and funded by the Ministry of the ...
    ... Group at the University of Belgrade, with the Geological information system of Serbia (GeolISS) developed at the Faculty of Mining and Geology and funded by the Ministry of the Environmental protection. The approach to GeolISS development, which is aimed at the integration of existing geologic archives ...

  • Fault type assessment based on vertical gravity gradient anomalies – advantages and limitations

    Ivana Vasiljević, Snežana Ignjatović, Branislav Sretković (2024)
    The type of dip-slip faults can be assessed based on the analysis of vertical gravity gradients. Theoretically, just a simple comparation of the gradient extreme values can give us an answer whether the fault is normal or reverse (thrust). Practical application of this method is far more complicated and the results depend on a number of parameters, such as a complexity of geological setting, the quality of gravity data, dip angle and displacement of the fault, density contrast, etc. ...
    dip-slip faults, vertical gravity gradients, field data analysis
    ... application of this method is far more complicated and the results depend on a number of parameters, such as a complexity of geological setting, the quality of gravity data, dip angle and displacement of the fault, density contrast, etc. Both the advantages and the limitations of the method based on ...
    ... application of presented method for the assessment of dip-slip fault's type and characteristics based on the analysis of vertical gravity gradients is very simple, especially when working along the profiles. The method enables quick and efficient estimation of the characteristics of the examined ...
    ... resolution and recommend the use of the gradiometers. Various numerical methods for the calculation of gravity gradients can be applied, but the problem is that they often produce different results and it is important to select the appropriate method. 86 METHOD OF INVESTIGA TION Faults often generate ...

  • Upper Cretaceous scaglia type limestone from Klepa Mts. (North Macedonia) - sedimentology and biostratigraphy

    Violeta Gajić, Milena Dunčić, Ana Mladenović, Dejan Prelević (2024)
    The research area is located in the central part of North Macedonia, in the area of the Klepa Mts. Based on sedimentological, micropaleontological and biostratigraphical investigations of samples from both the east and west side of the Klepa Mts., sedimentary rocks of the Upper Creaceous age are determined. During the latest Cretaceous, this area was dominated by the sedimentation of dominantly carbonate rocks with variable amounts of clastic components. From the tectonic point of view, investigated area belongs to the ...

  • Effect of Properties of Working Fluids on the Efficiency of a Low-Temperature Organic Rankine Cycle

    Marija Živković, Aleksandar Mijatović, Dejan Ivezić, Boban Pavlović (2024)
    Decarbonization of all segments of energy systems, both on the supply and demand side, is one of the main goals of the energy transition. Electricity supply in the future will largely rely on generation from intermittent energy sources: wind and solar. Locally available, non-utilized alternative low-temperature energy sources as hydro-geothermal wells, and abounded oil and gas wells, have the potential to provide continual energy production over the year. Electricity generation from these energy sources is carried out with working ...
    svojstva, radni fluidi, efikasnost, ORC, niska temperatura

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... the objective of the study is to examine the potential of biomarkers to distinguish Lower and Middle Miocene lignites in relation to sources and depositional environment of organic matter (OM). Lignite samples were collected from the 2nd Miocene Seam Horizon or its equivalent of Piskowitz (Lower ...
    ... norabietane. The hopanoid distributions of all samples dominated by C3117(H)21(H)22(R)-hopane, but Lower- and Middle Miocene lignites notably differ according to abundance of hopenes that is order of magnitude higher in later. This is associated with higher content of fernenes in Middle Miocene samples ...
    ... ratio < 0.5 (Bechtel et al., 2003) suggests a greater contribution of angiosperms. The contents of C27 and C29 n-alkanes in relation to C31 and C33 homologues imply similar impact of forested and reed-mire vegetation. The presence of tricyclic (abietane, pimarane, isopimarane) and tetracyclic (phy ...

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... the underground exploitation method. 2.2. Geological settings of the sampled deposits 2.2.1. Poland The majority of Poland's territory belongs to the European Paleogene–Neogene Basin. The lignite-bearing areas cover approxi- mately 70,000 km2, which is about one-third of the Poland's territory. Lignite ...
    ... overview of lithotype associations of miocene lignite seams exploited in Poland. Geologos 22, 213–225. https://doi.org/10.1515/logos-2016- 0022. Widera, M., Jachna-Filipczuk, G., Kozula, R., Mazurek, S., 2007. From peat bog to lignite seam: a new method to calculate the consolidation coefficient of lignite ...
    ... results may be an indication of how to plan coal seam exploitation. Our suggestion is that preferential extraction of detritic coals from opencast mines may reduce future GHG emissions. On the other hand, the detritic lignites that are exploited via the underground method (Velenje mine) show the potential ...

  • Terminological and lexical resources used to provide open multilingual educational resources

    Biljana Lazić, Danica Seničić, Aleksandra Tomašević, Bojan Zlatić (2016)
    Open educational resources (OER) within BAEKTEL (Blending Academic and Entrepreneurial Knowledge in Technology enhanced learning) network will be available in different languages, mostly in the languages of Western Balkans, Russian and English. University of Belgrade (UB) hosts a central repository based on: BAEKTEL Metadata Portal (BMP), terminological web application for management, browse and search of terminological resources, web services for linguistic support (query expansion, information retrieval, OER indexing, etc.), annotation of selected resources and OER repository on local edX ...
    otvoreni obrazovni resursi, leksički resursi, obrada prirodnih jezika, terminologija
    ... other consists of NLP tools for analysis and use of language by machines [1]. The usage and application of the research done in the field of the NLP has been present in the domain of education from the 1960s. One of the first advances made in this direction was the pioneering work of Ellis Batten ...
    ... There are two types of dictionaries: dictionary of simple words and dictionary of compounds. Two main components of dictionary of simple words are DELAS and DELAF. Here we have an entry found in Serbian dictionary of simple words: učiteljica, N651+Hum+GM:fs4v. The first part of entry is a lemma: ...
    ... dictionary of simple words consists of 133,361 lemmas. Their production is 4,581,657word forms. The number of units covered by Serbian morphological dictionary of compounds is 13,717, or 262,686 word forms [7]. RudOnto and GeolISSTerm are developed at the Faculty of Mining and Geology, University of Belgrade ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... platform An overview of the conceptual design of our TEL platform is depicted in Fig. 1. The platform consists of four groups of components, namely: • Tools - composed of FMG CMS, an in-house Content Management System (CMS) developed by the University of Belgrade, Faculty of Mining and Geology ...
    ... different levels of IT skills. Implementation of the OER network, on the other hand, needs successful organization of public procurement and acquisition of appropriate equipment. As for smooth operation of © Institute of Knowledge Asset Management - ISBN 978-88-96687-04-8 Proceedings of IFKAD - ISSN ...
    ... conceived as a WB-targeted OCW-based project some of its goals coincide with those of the Open consortium Europe. Namely, as the interest of European universities in OER and OCW rapidly grew, a consortium of HEI led by the Delft University of Technology has been formed. Besides Delft University ...

  • Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia

    Maja Milošević, Mihovil Logar, Biljana Đorđević (2021)
    ... 380 - 1000 nm range. A standard method was used to determine the water absorption of the investigated shreds of pottery (SRPS ISO 10545-3) reduced to the same dimensions. Based on the obtained results of tested samples of clay pottery, there are a couple of conclusions. Observed difference ...
    ... University of Latvia Inga Jurgelāne Riga Technical University Jūlija Karasa University of Latvia Solvita Kostjukova Alina Olita Medne Riga Technical University Rūta Ozola-Davidāne University of Latvia Valdis Segliņš University of Latvia Ilze Vircava Latvia University of Life ...
    ... traditional coiling and hand-wheel manufacture of pottery with raw clay from the local source are characteristic for Zlakusa (western Serbia), which is on the UNESCO Representative List of the Intangible Cultural Heritage of Humanity. Mass production of utilitarian ceramics and pottery items occurred ...

  • 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
    ... constructed for the stated elements. Imaging of the calibration solutions, extraction solutions and results processing was done as per the created “Rare Earths” method. The limit of detection (LOD) for this method for La amounts to 0.23 μg g-1, and the limit of quantification (LOQ) 0.77 μg g-1, whereas ...
    ... surface for disposal of electronic waste. Should such waste be disposed on such soil types, it would be beneficial to protect the soil with polymer or similar non-permeable material. The method of sequential extraction based on the results presented is suitable for extraction of rare earth elements ...
    ... elements from sand and clay type of soils. Humus soil has demonstrated more intensive sorption properties, therefore these types of extractions are limited on it, namely this method is not so undemanding. The characteristics (composition) of soil, pH value and extraction solution composition Acce pted ...

  • Using gravity data to define structural correlation affecting the formation of Neogene basins

    Snežana Ignjatović, Ivana Vasiljević, Branisav Sretković, Milanka Negovanović (2023)
    A gravity survey can help to define the structural correlation in the study area. The structures that have influenced the development of Neogene basins can be defined using gravity data. By applying mathematical transformations to gravity data, the geological structures (faults, nappes, etc.) that impacted the formation of Neogene basins can be defined. We have taken the part of the Dinarides as the test region. The paper presents the results obtained using the procedure residual, vertical gradient, and total ...
    gravity survey, mathematical transformation, basin