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2831 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

  • Failure Estimation of the Majdanpek Open Pit East Face Based on Inverse Velocity Model

    Miloš Marjanović, Stefan Milanović, Nikola Simić, Lazar Kričak (2024)
    The Majdanpek open pit mine south district is currently active mining prospect of copper ore exploitation in eastern Serbia. Its depth is approaching the termination depth and occurrences of large-scale instabilities and global instability of the final pit slope is possible. These can generate catastrophic mass movement inside an area that encloses a regional road route and the Pek River bed which is channelled along the outer contour of the pit. The displacements that were noted in early 2023, in the ...
    displacement, survey, inverse velocity, open pit

  • Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles

    Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)
    Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... determined by titration of 1.0, 1.5, and 2.0 mM solutions of [Ru(tr- py)(bpy)H2O] 2? with NaOH. The acid-base chemistry was characterized by fitting the potentiometric data to various acid-base models. The best model, selected according to the above-mentioned method of calculation, was consistent ...
    ... determined by titration of 1.0, 1.5, and 2.0 mM solutions of [Ru(tr- py)(bpy)H,O]?* with NaOH. The acid-base chemistry was characterized by fitting the potentiometric data to various acid-base models. The best model, selected according to the above-mentioned method of calculation, was consistent with the ...
    ... experiments were per- formed under pseudo first-order conditions, where the concentration of nucleophiles was always in at least tenfold excess (Supplementary Material, Tables 2S–5S). Substitution reaction of selected octahedral ruthe- nium(II) complex can be presented as shown in Scheme 1. The pseudo ...

  • Multi-word Expressions for Abusive Speech Detection in Serbian

    Ranka Stanković, Jelena Mitrović, Danka Jokić, Cvetana Krstev (2020)
    Ovaj rad predstavlja istraživanja na usavršavanju i unapređenju srpske verzije rečnika Hurtlex, višejezičnog leksikona uvredljivih reči. Posebnu pažnju posvećujemo dodavanju izraza sa više reči (polileksemskih jedinica) koji se mogu smatrati uvredljivim, jer su takvi leksički zapisi veoma važni za postizanje dobrih rezultata u mnoštvu zadataka otkrivanja uvredljivog jezika. Srpski morfološki rečnici se koriste kao osnova za čišćenje podataka i stvaranje rečnika. Istaknuta je veza sa drugim leksičkim i semantičkim resursima na srpskom jeziku i predviđena je izgradnja sistema za ...
    uvredljiv govor, govor mržnje, leksički izvori, višejezični leksikon, izrazi sa više reči
    ... used to collect MWEs that contains at least one of selected trigger word. Various sources were used: dictionaries, collection of threats and results of online search. Finally, a list of 4,624 MWEs was compiled that were candidates for the detection of some kind of offensive or hate speech. This list ...
    ... who firstly created an offensive word lexicon and then collected Twitter messages that contain at least one word from the lexicon. As authors noted, presence of a word in a tweet is just an indication of its offensiveness, thus subsequent manual annotation 2It should be noted that more MWEs from our ...
    ... detected accurately using this method. In addition, some insults which might be unacceptable to one group might be acceptable to another, thus taking context into account is very important (Nobata et al., 2016). Several authors reported using a multilingual online lexicon of hate speech available at hatebase ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy. Keywords: lignite; HDPE; co-pyrolysis; synergetic effect 1. Introduction Production of energy ...
    ... amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy. Keywords: lignite; HDPE; co-pyrolysis; synergetic effect 1. Introduction Production of energy ...
    ... references therein). However, concerning the huge amount of produced HDPE (the third largest produced plastic material in the world, after polyvinylchloride and polypropylene in terms of volume), at least part of it can be used for improved utilization of lignite, particularly in countries where this low-rank ...

  • 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)

  • Моделирање утицаја одступања линије најмањех отпора од пројектоване на интензитет потреса од минирања

    Стефан Милановић (2024)
    Према дефиницији линија најмањег отпора представља најкраће растојање од центра минског пуњења до слободне површине. Oвим истраживањем представљен је утицај линије најмањег отпора, као и њеног одступања од пројектоване на интезитет потреса услед минирања. Проблем линије најмањег отпора је веома заступљен у пракси, где се занемарује изглед слободне површине, који може бити врло неправилан. Линију најмањег отпора је потребно мерити целом дужином минске бушотине према слободној површини, иако је у пракси случај да се мери најчешће као растојање од ...
    линија најмањег отпора, 3D модел, потреси услед минирања, минирање, слободна површина, метода раздвојених елемената

  • 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
    ... insulation industries. The production of this asbestos-based pottery continued up to the middle of the 20th century. Istria [7] identified at least 15 familial workshops active around 1900. Documents indicate that 3 volumes of “clay” were mixed with 1 volume of “dried asbestos tow”. Artefacts were ...
    ... excavations of different sites in 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, ...
    ... (JEOL, Tokyo, Japan) using an acceleration voltage of 20 kV. The sample was wrapped with carbon-rich tape with a small window for the area to be studied. Quantitative elemental analysis (oxide) was conducted done using, the ZAF calculation method as implemented in the Iridium Ultra software (IXRF ...

  • SrpELTeC: A Serbian Literary Corpus for Distant Reading

    Ranka Stanković, Cvetana Krstev, Duško Vitas (2024)
    U članku je predstavljen SrpELTeC, korpus razvijen u okviru akcije COST Distant Reading for European Literary History (CA16204). Svi romani u SrpELTeC-u su odabrani, pripremljeni i obeleženi korišćenjem zajedničkih principa uspostavljenih za sve jezičke zbirke u Evropskoj zbirci književnog teksta (ELTeC). Navedeni su izazovi i rešenja u pripremi SrpELTeC od nule. Svi romani su ručno kodirani u TEI sa bogatim metapodacima i strukturnim napomenama. Automatska anotacija je uključivala POS-označavanje, lematizaciju i imenovane entitete, oslanjajući se na resurse za obradu ...
    digital humanities, Serbian literature, text corpora, distant reading , linked data, named entity recognition, text analytics

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... industry. It is the authors’ wish to bring closer to the mining public at least a small part of the possibilities offered by GIS, both in mining activities and in environment protection. This paper outlines a methodology for development of a spatial database, that is, a geodatabase, for open pit mines. The ...
    ... University of Belgrade, Faculty of Mining and Geology, is precisely the software package ArcGIS. GEODATABASE MODELING The fundamental component of a geographic information system is a spatial database or geodatabase. The concept of a database pertains to a collection of various types of geographic ...
    ... vector content of AutoCAD and other CAD software. In the case of raster data, there are also possibilities for import of various formats, as well as for grouping of raster data in the so-called raster datasets or raster catalogues. Another way of creating a database is the design of a new spatial ...

  • 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
    ... Paving of interior horizontal surfaces of moderate pedestrian traffic areas (libraries, archives, book stores, waiting rooms, etc.) IV-I Cladding of interior vertical surfaces EH-I Paving of exterior horizontal surfaces of very intensive pedestrian and occasional vehicular traffic areas (squares, pedestrian ...
    ... and MgO contents were determined for the same samples, applying: a complexo- metric method using a standardized solution of 1 MEDTA (ethylenediaminetetraacetic acid) as the titrant. To determine the quality of the selected carbonate rocks, the physical and mechanical properties (bulk and apparent ...
    ... es: the Laboratory of the High- way Institute (Laboratory for Stones and Stone Aggregates) and the Institute for Testing: of Materials-IMS Institute (Laboratory for Stones and Stone Aggregates) in Belgrade. The bulk density was determined according to the standard method SRPS B.B8.032 (1980) ...

  • A Multilingual Evaluation Dataset for Monolingual Word Sense Alignment

    Sina Ahmadi, John P McCrae, Sanni Nimb, Fahad Khan, Monica Monachini, Bolette S Pedersen, Thierry Declerck, Tanja Wissik, Andrea Bellandi, Irene Pisani, [...] Ranka Stanković and others (2020)
    Aligning senses across resources and languages is a challenging task with beneficial applications in the field of natural language processing and electronic lexicography. In this paper, we describe our efforts in manually aligning monolingual dictionaries. The alignment is carried out at sense-level for various resources in 15 languages. Moreover, senses are annotated with possible semantic relationships such as broadness, narrowness, relatedness, and equivalence. In comparison to previous datasets for this task, this dataset covers a wide range of languages ...
    lexical semantic resources, sense alignment, lexicography, language resource
    ... between number of tokens Table 3 represents the results of our evaluations on the aligned senses. The degree indicates the distribution of the alignments with respect to the senses. For instance, a de- gree of 1.182 (k1) in the case of Russian shows that every sense is at least aligned with another ...
    ... for constructing an n-way alignment of LSRs and applied it to the produc- tion of a three-way alignment of the English WordNet, Wikipedia and Wiktionary. Niemann and Gurevych (2011) propose a threshold-based Personalized PageRank method for extracting a set of Wikipedia articles as alignment candidates ...
    ... Danish from 1700-1950, and Den Danske Ordbog (DDO) (Farø et al., 2003) a dic- tionary of modern Danish covering Danish from 1950 till today. One additional criterion in data selection was that at least one of the senses in DDO should be linked to a base or core concept in the Princeton Word- Net ...

  • Bilingual lexical extraction based on word alignment for improving corpus search

    Jelena Andonovski, Branislava Šandrih, Olivera Kitanović (2019)
    Library and Information Sciences,Computer Science Applications

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... purpose of quality homogenization is expressed by the selection of stacking method and stacking the requisite number of layers. The number of layers, stacking method, size and number of piles in the stockyard are selected by applying standard deviation as a statistical decision-making method. This ...
    ... When the required number of layers is small, the chevron method or a modification thereof is selected, whereas the method of choice when a large number of layers is required is windrow or a combination of the chevron and window methods. Given than the windrow method is technologically more complex ...
    ... stockyard the number of layers is around 50, however both a smaller and a larger number of layers should remain an option. By selecting the number of layers that need to be stacked in order to get coal of uniform quality, the stacking method/sub-method can also be defined. In the case of the "Tamnava ...

  • Infotheca (Q25460443) in Wikidata

    Ranka Stanković, Lazar Davidović (2021)
    Vikipodaci su baza znanja Zadužbine Vikimedija koja predstavlja zajednički izvor različitih vrsta podataka koje koriste ne samo drugi Vikipedijini projekti, već sve više i brojne aplikacije semantičkog veba. U ovom radu ćemo prezentovati primer integracije Vikipodataka sa digitalnim bibliotekama i eksternim sistemima, kao i mogućnost ubrzanja pripreme i unosa podataka na primeru radova iz časopisa za digitalnu humanistiku Infoteka.
    semantički veb,otvoreni povezani podaci, vikpodaci,Infoteka, metapodaci časopisa
    ... application. We must certainly be aware of the problems and limitations related to Wikidata and other kinds of linked open data, so as to be able to look into the ways of overcoming or at least mitigating them. Wikidata is a truly immense knowledge base that is 1) available to ev- eryone – for reading ...
    ... example). An item can be described by a string of statements, each of which provides a fact or a piece of data about the item. Table 1 shows several examples of natural language sentences and the encoding of this information in Wikipedia, represented as triples of subject, predicate and object (left), and ...
    ... gf.bg.ac.rs University of Belgrade Faculty of Mining and Geology Belgrade, Serbia Lazar Davidović lazarmdavidovic@gmail.com University of Belgrade Belgrade, Serbia 1 Introduction Wikidata1 is a Wikimedia Foundation knowledge base, a common source of various kinds of data, both concrete and abstract ...

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike

  • 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
    ... WordNet has 607 in this domain, which means that at least another 375 synsets need to be added to SrpWN, such as: ENG3013860281nimplication:4, logicalimplication:1, conditional relation: ENG30-13859307-n difference:4. The enrichment of morphological dictionaries and SWN should be complemented ...
    ... Novi Sad/Faculty of Technical Sciences, Novi Sad, Serbia 2 University of Belgrade/Faculty of Mining and Geology, Belgrade, Serbia 3 University of Belgrade/Faculty of Philology, Belgrade, Serbia * marija.radojicic@uns.ac.rs Abstract: In recent years, in line with ever growing usage of Information ...
    ... different ways of writing mathematical formulae, one of the main challenges in obtaining a searchable format of these materials is the conversion of source files, given specific Serbian letters. MLES provides a semantic search engine, which allows for processing of various formats of user requests ...

  • 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
    ... testing of the CBR+p, modulus of deformation (E,, —E,), and dynamic modulus of deformation (Ey„). The objective of regression analysis was to determine the parameters in the least-square error models, which are used to predict the conventional parameters of compaction and the bearing capacity of the ...
    ... incorporation into the substrate layer; – the method of using a non-standardized dynamic California Bearing Ratio (CBR,) device and the defi- nitions of its values under laboratory and field conditions are proposed; – the values of the modulus of deformation of the pavement foundation layer (subgrade) ...
    ... The primary objective of this study was to establish reliable correlations between the selected param- eters of the gravel material so as to describe the compaction and bearing capacity of the substrate, and de- 32 velop a method of using and defining the values of a CBR, device. The following ...

  • Pre-failure deformation monitoring as rockfall prediction tool

    Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić (2021)
    General Engineering
    ... For reliable registration process of the three adjacent scans, 5-8 equally distributed black/white (B/W) targets should be placed across the slope and surrounding area. • Scanning parameters should be set to 6.3 mm/10m to provide spatial resolution at least of 3 cm over the entire rock face. ...
    ... Vranić2 1University of Belgrade, Faculty of Mining and Geology, Đušina 7, Belgrade, Serbia 2University of Belgrade, Faculty of Civil Engineering, Bul. Kralja Aleksandra 73, Belgrade, Serbia milos.marjanovic@rgf.bg.ac.rs Abstract. In this article, we are elaborating an example of predictive rockfall ...
    ... Figure 1. Location (left), appearance of the slope (middle), and plan of scanning disposition (right). it is beyond the scope of this article to overview the current research and practice state-of-the-art in the field of LiDAR-based monitoring. Instead, some milestone contributions ...