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1991 items

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... for e-eLearning and Webinars3, as well as an in-house course MS developed at its Faculty of Mining and Geology (Stanković et al., 2011). BMP, the central repository with metadata for all published OER within BAEKTEL is hosted by UB, in addition to its own OER in edX and other LMS. BMP features ...
    ... content, as well as what are the prerequisites needed for its use, without even seeing the resource itself (Velichová, 2008). As the amount of OER reaches a considerable size, it becomes important that each learning resource is well described and tagged in a standard way, and in machine readable ...
    ... creation of online textbooks, as well as discussion forums for student-student interaction. Finally, edX provides for online laboratories, as for example in its first MOOC, a course on circuits and electronics, where students were able to build virtual circuits in an online lab (Breslow et al., 2013) ...

  • Low-temperature phase transition and magnetic properties of K3YbSi2O7

    Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica
    ... symmetry can be prepared as well (�-K3YbSi2O7). Crystal structures of these two ambient-temperature polymorphs consist of the same building units: Si2O7 groups and YbO6 polyhedra which are connected into a three-dimensional framework with K+ cations located in cavities in the net. In the crystal structure ...
    ... symmetry can be prepared as well (8-K3YbSi,O7). Crystal structures of these two ambient-temperature polymorphs consist of the same building units: Si,07 groups and YbO., polyhedra which are connected into a three-dimensional framework with K* cations located in cavities in the net. In the crystal structure ...
    ... dr.rgf.bg.ac.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 electronic reprint ISSN: 2052-5206 journals.iucr ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... new system. The evaluation, as well as the analysis of the results showed that the old system achieves good results when searching with terms that occur as discipline and mineral resources classifiers, which are thus listed in the appropriate fields in the same form in which the users formulate their ...
    ... Petrović, asistent, Petrović. The biggest problem of the new system are specific technical terms that are not found in electronic dictionaries as well as quite a number of typographical errors in the document collection. However, this shortcoming can be rectified by correcting errors (based on the list of ...
    ... klizǐste 1.000 0.193 0.807 landslide 8 geofizički karotaž ; Naftagas 0.235 0.596 -0.361 geophysical logging; Naftagas 9 geofizički karotaž ; Naftagas NIS 0.118 0.113 0.004 geophysical logging; Naftagas NIS 10 ugalj lignit ; Kostolac Požarevac 0.285 0.732 -0.447 coal lignite; Kostolac Požarevac ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... reached, it is very important that they are well described and tagged in a standard way in machine readable form. This approach has many advantages: • Results returned by search engines are more relevant and better described; • Those interested in course materials (both educators and learners) ...
    ... PC or mobile device. It features state of the art content authoring tools, as well as tools for measuring real-time engagement in virtual classes and tracking individual student progress. Another component envisaged in our TEL platform, Adobe Connect for Webinars, offers templates for creation of ...
    ... creation of online textbooks, as well as discussion forums for student-teacher interaction. Finally, edX provides for online laboratories, as for example in its first MOOC, a course on circuits and electronics, where students were able to built virtual circuits in an online lab (Breslow et al., 2013) ...

  • 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

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 12% International Conference on Energy and Climate Change, 9-11 October 2019, Athens - Greece The application of ArcGIS for assessing the potential of solar energy in urban area: ...
    ... consumption. In accordance with Directive 2009/28/EC of the 327 EU, Serbia adopted the National Action Plan for RES as a framework for promotion of energy generated from RES and set mandatory national goals for share of renewable energy in gross final consumption of energy (27%) as well as the ...
    ... contribution to the lesser utilization of fossil fuels, as well as the improvement of the environment. The biomass potential amounts to approximately 3.4 Mtoe per year (2.3 Mtoe per year is unused, and 1.1 Mtoe is used), 1.7 Mtoe lies in hydropotential (0.8 Mtoe per year is unused, and 0.9 Mtoe ...

  • 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
    ... principal phase present in raw phosphogypsum sam- ples, which is formed according to the chemical reaction in Eq. (6): Cayjo(POx);F+ + 10H>SOa + 20H,O — 10CaSOu · 2H,O + 6H5PO, + 2HF (6) Quartz is the predominant Si-bearing phase, originating from the parent phosphate rock, as well as being precipitated ...
    ... dr.rgf.bg.ac.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 Clay Minerals (2020), 55, 63–70 doi:10.1180/cim ...
    ... series breaks down. The main objective of this study was to extract and character- 23; ize purified gypsum, as well as phosphogypsum. A secondary ol radionuclide activities in sampi waste deposit before and after tl insoluble impurities from raw bjective was to examine natural es of ph ...

  • Evidence for Ladinian (Middle Triassic) platform progradation in the Gyulakeszi area, Tapolca Basin, Western Hungary: Microfacies Analysis and Biostratigraphy

    Zsolt Robert Nagy, Nevenka Đerić, Sándor Kovács, Anna Oravecz-Scheffer, Felicitász Velledits, Olga Piros, Gabor Csillag (2014)
    anizik, ladin, karbonati, litostratigrafija, biostratigrafija, konodonti, radiolarije, dijageneza
    ... describes some well-known examples to illustrate this point. In the nearby Veszprćm Plateau (Fig. 1b), the minor role of progradation in the evolution of the Pel- sonian and late IHlyrian platforms was possibly in con- nection with intense tectonic subsidence (Budai & Voros 2006). In contrast, ...
    ... grey, well- stratified, nodular limestone (Fiired Limestone Forma- tion), a typical pelagic basinal facies in the Balaton Highland, is known on the surface from Kovesk4l (Fig. 1b). Upper Triassic (Carnian to Rhaetian) carbo- nates are poorly exposed in the area, and mostly found in boreholes ...
    ... All of these forms were found in the well-stratifted or mas- sive limestone at the uppermost part of the outcrop (Fig. 3). 'The most important fossil component of the lime- stone in terms of numbers and importance is 7b:pbytes sp. found as reworked bioclasts in the graded grainstone and rudstone ...

  • 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
    ... traffic [21], etc. The AHP method finds its role in the field of mining as well [10,22–27]. The main advantage of this method is ease of use, followed by the quality of output data. It relies on the theory of the relative weight determination of the factors in decision-making. It is based on the measurements ...
    ... regarding position and power supply, as well as automatic protection against overcharging [32]. Energies 2019, 12, 2245 7 of 16 The dozers which are used in open-cast mines are dozers that have a caterpillar transport system. The pneumatic transport system is used in the construction industry. The analysis ...
    ... Shift duration, gross salary, as well as the reserve coefficient (1.25) in the worker–machine relation. 3.3. Exploitation Parameters (ExP) The third criterion—the exploitation parameters—shows the current condition of the machines, the history of their work, as well as the trends concerning the maintenance ...

  • 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
    ... ns available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs _____________________________________________________________________________ 428 LIFE CYCLE ASSESSMENT OF INDIVIDUAL WOOD BIOMASS HEATING SYSTEMS IN HOUSEHOLDS Boban ...
    ... and low wood combustion efficiency [6]. In the last decade, wood pellets have seen high growth rates in consumption, and also in production, in Serbia [7]. From the complete production of wood fuels in Serbia, the expansion of production capacities was largest in the wood pellet segment. Until 2016, ...
    ... houses, apartment buildings, etc. [3]. In Household Budget Survey 2018, published by the Statistical Office of the Republic of Serbia [5], solid fuels (wood and coal) are used in 56.6% of households for heating in Serbia. The usage of wood biomass for heating in Serbia is characterized by excessive ...

  • 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

  • Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2019)
    In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...
    NER, Named Entity Recognition Systems, Serbian, Personal Names
    ... SRPNER continued, as well as the en- hancement of e-dictionaries of Serbian. 3 Training Different NER Systems 3.1 Training Sets The gold standard GOLDPERS contains 9, 046 sentences, each one enclosed in ... tag. Named entities in sentences are annotated using tags listed in Table 1. These tags ...
    ... 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 Proceedings of Recent Advances in Natural Language Processing, pages 1060–1068, Varna, Bulgaria, Sep 2–4, 2019 ...
    ... on-line tool. An example of this format is given in Table 5. 4 Evaluation In order to evaluate three NER system for personal names in Serbian, we need to have the output re- sults in the same format. After running SPACY NER on a text, an output is provided in BRAT for- mat with ann extension. This format ...

  • A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice

    Nikola Lilić, Ivan Obradović, Ranka Stanković (2002)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...
    ... specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we present the design methodology of the hybrid system INVENTS, as well as system ...
    ... barometric pressure in mine ventilation nodes were measured, as well as the air flow volumes in network branches. The data obtained were used as input for the ResNet software, which calculated aerodynamic resistance of the airflow in network branches. The results are shown in the canonical ventilation ...
    ... estimated characteristics of air loss in the “Soko” mine ventilation network are given in Fig. 13. As we have already mentioned the estimation of the ventilation system state in the “Soko” mine is a consequence of considerable air loss in the ventilation network, as well as of low effective use of the overall ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Multiword Expressions between the Corpus and the Lexicon: Universality, Idiosyncrasy and the Lexicon-Corpus Interface

    Verginica Barbu Mititelu, Voula Giouli, Kilian Evang, Daniel Zeman, Petya Osenova, Carole Tiberius, Simon Krek, Stella Markantonatou, Ivelina Stoyanova, Ranka Stankovic, Christian Chiarcos (2024)
    Predstavljamo trenutne aktivnosti na definisanju interfejsa leksikona i korpusa koji će služiti kao referenca u prikazu polileksemskih jedinica - višečlanih izraza - (različitih tipova - imenskih, glagolskih, itd.) u specijalizovanim leksikonima i povezivanju ovih unosa sa njihovim pojavljivanjima u korpusima. Konačni cilj je korišćenje ovakvih resursa za automatsko identifikovanje višečlanih izraza u tekstu. Uključivanje nekoliko prirodnih jezika ima za cilj univerzalnost rešenja koje nije usredsređeno na određeni jezik, kao i prilagođavanje idiosinkrazijama. Raspravljaju se izazovi u leksikografskom opisu višerečnih ...
    multiword expression lexicon, corpus, proof-of-concept lexicon encoding

  • 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
    ... geomechanical laboratory equipment. In addition, average values of these parameters based on literature data, as well as results obtained by testing the old municipal waste from two landfills in Serbia (closed landfill Ada Huja in Belgrade and city landfill in Novi Sad) will be presented. Keywords: ...
    ... 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 Japanese Geotechnical Society Special Publication Third International Symposium on Coupled Phenomena in Environmental Geotechnics Phase relations ...
    ... (porosity within particles) and porosity between partcles. However, in this way 109 definition of phase composition as well as determination of mechanical properties of municipal waste is further complicated, because in the landfil can be found particles saturated inside with contacts between ...

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... dr.rgf.bg.ac.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 249 8th International Conference MINING ...
    ... and in advanced development [5]. Figure 2. CCS facilities in industrial sector in different stages of development [5] 251 2.2. Capturing after combustion In post-combustion systems, CO2 is captured from the flue gases produced by combustion of fossil fuels and biomass in air, ...
    ... capture is shown in Figure 4. Figure 4. Schematic description of a pre-combustion capture [17] 2.4. Capturing CO2 by oxy-fuel In oxy-fuel combustion, nearly pure oxygen (95-99%) is used for combustion in power plants instead of air, resulting in reduced amount of nitrogen in the flue gas mixture ...