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Упит dcterms_subject_txt:mathematical content

473 items

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... engineering practice. To that end complex issues had to be resolved, such as mathematical text analysis, processing of mathematical content in different formats, search of mathematical materials, indexing of mathematical content using Serbian lexical resources, issues that are further complicated due ...
    ... from corpus to LaTeX format, where mathematical formulae will be presented as strings, which will facilitate processing and search of mathematical content. One of the most important parts in processing mathematical content is semantic search of mathematical formulae. According to [5], [6] there ...
    ... processing of mathematical content by usage of different tools which are still under development. The concept has several advantages such as: comprehensive learning environment, development of search engines which are suitable for mathematical content, processing of mathematical content and augmentation ...

  • 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

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... creating mathematical OERs. Besides the need for a more user friendly editor and more possibilities in presenting mathematical content, there is also a need for engines which support searching of mathematical content. Currently, there a search engine for searching mathematical content within ...
    ... Image 3: Solution of the task 4. PRESENTING MATHEMATICAL CONTENT USING EDX-BAEKTEL PLATFORM Over the last few years, mathematical content on the web is increasing, which means that production and exploitation of mathematical content using information technology (IT) is in progress ...
    ... creating mathematical content. TPACK has been presented as a system which interconnects and intersects technology, pedagogy, and content knowledge [7]. According to this model technological knowledge has an important place in creating mathematical content. However, creating mathematical content ...

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... paper, the most common determination methods of basic parameters of municipal waste physical condition will be presented (moisture content, organic substances content, unit weight, specific gravity, porosity, grain size distribution), using standard geomechanical laboratory equipment. In addition ...
    ... mš/m* e= V /V, = | ___I-n Unit weight W a of solid A kN/m* E i ——— particles Vs 1-n 'Volume water v m*/m* v= V Zw.J0 content -% V Yw Volume gas a m*/m* a _&_ n_w content -% a Saturation g m*/m* S =&=X degree ii -% ii Vp The three-phase system for municipal waste does not take into account ...
    ... particles were classified in solid phase for which, in soil mechanics, is assumed that its total volume does not change in time. 3.1 Water content Water content of municipal waste has a significant impact on its geotechnical characteristics, and it is of particular importance during the planning ...

  • LRMI markup of OER content within the BAEKTEL project

    Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić (2015)
    ... and teachers quickly find relevant educational content via regular search engine. Within the BAETEL project we have developed a metadata portal as the metadata and content repository, as we felt the need for a better way to describe the content and thus increase web visibility for OER resources ...
    ... 2023-10-14 03:29:33 LRMI markup of OER content within the BAEKTEL project Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] LRMI markup of OER content within the BAEKTEL project | Ranka ...
    ... detailed microdata, the more “findable” our content and educational resources will be for teachers and students. The solution for LRMI implementation within BAEKTEL metadata portal outlined in this paper enables efficient search and browse of OER content and provides the infrastructure for successful ...

  • 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
    ... 20.09–33.73 25.90 3.26 17.06–40.42 27.05 5.00 21.79–41.09 27.38 6.09 War – moisture content, as received basis, %; Wan – analytical moisture content, %; Adb – ash content, dry basis, %; Sdb – total sulphur content, dry basis wt.%; Vdb – volatile mat- ter, dry basis wt.%; Q daf g – gross calorific value ...
    ... Q daf n – net calorific value, dry, ash-free basis, MJ/kg; Cdaf – carbon content, dry, ash-free basis, %; Hdaf – hidrogen content, dry, ash-free basis, %; Ndaf – nitrogen content, dry, ash-free basis; Odaf – oxigen content, dry, ash-free basis, %; X̅ – arithmetic mean value; Min – minimum; Max – ...
    ... contain a higher sulphur content of more than 3%. Coal seam I has a medium (1–3%) to high sulphur content (>3%), with the highest content (4.40% in sample 31/91; Table S­II of the Supple­ mentary material) in the bottom part of the seam in the B field. Total sulphur content in coal seam II ranges from ...

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • A Tel Platform Blending Academic And Entrepreneurial Knowledge

    Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović (2013)
    ... namely: • Tools - software to support the development, use, reuse and delivery of learning content, including content and learning management systems, as well as content development tools; • Learning content - learning resources, both academic and entrepreneurial, and reference resources, where ...
    ... property licenses to promote open publishing of materials, and best practice design principles. The content management system that BAEKTEL relies on is FMG CMS, an in-house Content Management System (CMS) developed by the University of Belgrade, Faculty of Mining and Geology (FMG) as ...
    ... attendance; and measure results for optimized outcomes (http://wwwimages.adobe.com/www.adobe.com/content/d am/Adobe/en/products/adobeconnect/pdfs/91030579_Con nect_Overview_ue.pdf). Within content development tools are several commercial tools, and LeXimir, a multipurpose tool developed by ...

  • Using Metadata For Content Indexing Within An OER Network

    Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci (2014)
    ... Using Metadata For Content Indexing Within An OER Network Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Using Metadata For Content Indexing Within An ...
    ... responsible for producing the content of the resource. Description is the abstract, a concise description of resources.Contributor is a person, organization, or service responsible for making contributions to the resource. Type identifies the nature of the content of the resource, such as"best ...
    ... 49 The Fifth International Conference on e-Learning (eLearning-2014), 22-23 September 2014, Belgrade, Serbia USING METADATA FOR CONTENT INDEXING WITHIN AN OER NETWORK University of Belgrade, Faculty of Mining and Geology, ranka.stankovic@rgf.bg.ac.rs, olivera.kitanovic@rgf.bg.ac ...

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... depending on the water content for differ- ent compaction energies. Regarding the impact of water content on the formation of the gravelly material samples subjected to CBR,, testing, it was observed that CBR,, reached the highest value when the samples were compacted with water content close to w„„. ...
    ... sample formation increased, CBRy „ decreased to 2.0% of the water content for formation, and then increased again as the water content increased from 2.0% to approximately 9.7% (SP) or 8.8% (MP), approaching w„ . Increasing the water content for formation above w„„ resulted in a decreasing trend for ...
    ... fine-grained soil under different compaction conditions. The study considered clay material with a water content of approximately + 4% w (maximum dry bulk density p,wax = 1.82 Mg/m*, optimal water content Wop = 15.6%). A comparison between the results of California Bearing Ratio (CBR) research on stat- ...

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... ŽH/ŠžHe radioactive isotope content tests in Krupaja Spring groundwater. Content of 3 ; 3H/ŠHe Age Apparent Age Radioactive Isotopes HOIJ (H—) 1 Sigma (Years) (Years) ; . 5.64 0.17 Krupaja Spring, 57 0.3 26.1 0.7 Table 4. Results of ŽH radioactive isotope content test in thermal spring, and B-1 ...
    ... 54 0.29 Krupaja thermal spring—Winter 2 26.6 7.14 543 1.13 1.6 The content of stable isotope &15C decreases with circulation depth, indicating a higher groundwater age and longer contact with the host rock. The carbon content at the Krupaja Spring, ranges from —8.20 to —10.31%o, also indicating ...
    ... surface water, but water that has had a long residence time within the system, lowering the stable carbon isotope content by up to —5.32%o. Table 2. Stable isotope groundwater content results from the Krupaja Spring, Thermal spring, and Borehole B-1. Location &DCp;c(V-PDB) % &D(V-SMOW) % &1O(V-SMOW) ...

  • Mikroelementi u kvartarnim sedimentima i lignitu Kostolačko-kovinskog ugljonosnog basena, istočna Srbija – odabrani primeri

    Bogoljub Vučković, Biljana Radovanović, Dragana Životić (2022)
    Sadržaj, distribucija i način pojavljivanja elemenata u tragovima (mikroelemenata), posebno potencijalno toksičnih i radioaktivnih elemenata u uglju, su od velikog značaja, posebno ako se koriste kao gorivo u termoelektranama (TE). Na osnovu sistematski prikupljenih podataka o elementima u tragovima u uglju, zemljištu i sedimentima, moguće je utvrditi stepen zagađenosti vazduha, zemljišta, vode, kao i negativan uticaj na zdravlje ljudi. Eksploatacija i istraživanje lignita u Kostolcu i Kovinu traje više od jednog veka, dok se sagorevanje lignita sa površinskih kopa ...
    mikroelementi, sedimenti, lignit, Kostolac

  • A bilingual digital library for academic and entrepreneurial knowledge management

    Ranka Stanković, Cvetana Krstev, Biljana Lazić, Dalibor Vorkapić (2015)
    A generic knowledge management process of organization, storage and retrieval of knowledge can suitably be fitted in a digital library. In the digital and knowledge age digital libraries can be used in knowledge management to handle intellectual assets and support knowledge creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to monolingual content. In Serbia 18 of 308 scientific journals regularly published are bi-lingual, with papers simultaneously being in English ...
    Knowledge management, Digital library, Multilingualism, Language Resources, Terminology
    ... creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to 1 monolingual content. In Serbia 18 of 308 scientific journals regularly ...
    ... The approach to the development of the presented digital library was to store its content in a NoSQL-database, with a web tool to enable the use of rich information in the stored text collections. The library content originates from various bilingual sources, with all documents aligned at the sentence ...
    ... ally and semantically. Thus it offers a novel access to digital content to its users. In addition to that, Bibliša presents an original approach to successful combining of several components: Lexical resources, Library content, Web services and Web interface. Practical implications– Digital ...

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • Petrographical and organic geochemical study of the subbituminous coal from the Dubrava field, Aleksinac basin (Serbia)

    Željana Sekulić, Ksenija Stojanović, Achim Bechtel, Reinhard Sachsenhofer, Miomir Petrović, Ivan Kojić, Dragana Životić (2019)
    ... The content of vitrinite group macerals increases from top to bottom of the Main coal seam which is associated with a notable decrease of liptinite and mineral matter (MM). Contents of collotelinite, collodetrinite and corpogelinite increase downward through the Main seam, whereas content of vi ...
    ... 13(18)-neohopene series, suggest in addition to ferns, contribution of chemoautotrophic bacteria. Content of total n-alkanes increases through the seam, Which is associated with notable decrease of content of short-chain (С15-Сг0) and increase of long-chain (Cz6-Ca3) homologues. The obtained results ...
    ... ds and non-hopanoid triterpenoids notably decreases downward through the seam indicating lower conifer input. Typical feature of coal is high content of fernene derivatives, which decreases through the seam. The stable carbon isotopic composition of fernene derivatives implies that they mostly ...

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

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... often with additional multimedia content. The lesson content is basically what students need to prepare for the oral exam. Figure 4: FMG Moodle Course web page Figure 5 shows a part of one such lesson, which has the goal not only to present the content of the classroom lecture, but ...
    ... specific content, individual grades of students and grades at the course level. Picture 7 shows the weekly statistics of access for the course Informatics I grouped by different course content: Lessons, Resources and Assignments. Figure 7: Weekly access to various course content Another ...
    ... Besides the administrator, the two most important are the teacher, who can edit and modify the course content and monitor student activities, and the student, who can access the course content, perform different activities proposed, and view his/her own results. Moodle is a flexible and modular ...

  • 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)
    ... s between Middle and Lower Miocene coals are expressed by higher dehydroicetexane content, Paq index, the tetracyclic/tricyclic diterpanes ratio and non-hopanoid triterpenoids content, as well as by lower content of total hopenes (particularly those with double bond at 13(18)-position) and fernenes ...
    ... with ash contents < 11.5 % indicate relatively stable water-level during peat formation and moderate supply of mineral matter. Total sulphur content ranges from 0.67 to 0.80% and from 0.90 to 1.24 % in Lower and Middle Miocene samples, respectively, implying peatification in the freshwater environment ...
    ... 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, which are absent in most of the Lower Miocene lignites. Although non-hopanoid triterpenoids played a ...

  • Effect of pulp solid phase content alteration on “Lisina” phosphate flotation process

    Radulović Dragan, Vučinić Dušica, Branislav Ivošević, Zorica Lopičić (2012)