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1276 items
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Effectiveness Analysis of Different Bucket-wheel Excavators
Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić. "Effectiveness Analysis of Different Bucket-wheel Excavators" in 8th International Conference Mining and Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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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)... mineral phases followed the criteria recommended by Mikheev (1957) and the Joint Committee for Powder Diffraction Standards (JCPDS). Whiteness index In order to compare the quality of the samples for utilization in the construction industry, the whiteness index (WI) values of raw phosphogypsum ...
... the opposite result was obtained for recrystallized gypsum. For both phosphogypsum samples, the calculated values for Ra.qyx the a-index and almost all y-indices were higher than the international recommended limits, except for the y-index limit calculated for utilization in road construction ...
... stirrer, the mixture was stirred for 2 h at ~45%C, allowed to settle for 2 h at the same tempera- ture and filtered through filter paper. The filtrate was then heated in another beaker at 90*C, stirred with a magnetic stirrer for 1 h and allowed to settle for 7h at the same temperature, allowing ...Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić. "Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering" in Clay Minerals, Cambridge University press (2020). https://doi.org/10.1180/clm.2020.11
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Building Terminological Resources in an e-Learning Environment
... consider ontologies and thesauruses as one and the same, the difference being only in the purpose they are built for. For some other authors, a terminological resource qualifies for an ontology only if new knowledge can be derived from segments of knowledge already existing in the resource. According ...
... controlled dictionary is a consistent collection of terms selected for a specific purpose, chosen by its author. For example, a controlled dictionary from RudOnto is used for labeling and annotation of cartographic content both in Serbian and English. Such annotation is enabled by the existing ...
... hand side offers the full entry for the selected concept in the hierarchy. The entry consists of the basic term used for this concept, its synonyms (none in this case), and its definition. The smaller panel illustrates yet another feature of RudOnto. Namely, for each term, such a panel can be invoked ...Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja. "Building Terminological Resources in an e-Learning Environment" in Proceedings of the Third International Conference on e-Learning, eLearning-2012, September 2012, Belgrade, Serbia, Belgrade : Belgrade Metropolitan University (2012)
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Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif
Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental ChemistryLjiljana Vasić, Laszlo Palcsu, Huang Fen. "Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif" in Environmental Earth Sciences, Springer Science and Business Media LLC (2019). https://doi.org/10.1007/s12665-019-8294-0
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Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation
Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović. "Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation" in Thermal Science, National Library of Serbia (2023). https://doi.org/10.2298/TSCI220813168I
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An Approach to Development of Bilingual Lexical Resources
... is META- SHARE, an open distributed facility for sharing and exchange of language resources among various European languages [Piperidis, 2012]. Another project, the Multilingual Web Initiative, led by W3C, is a thematic network, exploring standards and best practices supporting the creation ...
... interesting tool for keyword extraction in multilingual textual repositories is described in [Pammzi et al., 2006]. The tool extracts keyword collocations from documents and generates multiword keywords. The paper also outlines linguistic criteria used for building language resources for French, Italian ...
... lexical resources, morphological e-dictionaries, together with the system of rules for compound inflection, finite automata and transducers, represent the basis for morphological expansion of queries. As for semantic and bilingual expansion, the system relies on Serbian and English wordnets ...Stanković Ranka, Obradović Ivan, Trtovac Aleksandra. "An Approach to Development of Bilingual Lexical Resources" in Proceedings of the Fifth Balkan Conference in Informatics BCI 2012, Workshop on Computational Linguistics and Natural Language Processing of Balkan Languages – CLoBL 2012, September 2012, Novi Sad : BCI (2012)
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Integrative GHG Assessment in Oil and Gas Industry
Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...... emission factor for gas flaring can be most accurately calculated by using the stoichiometric equation [8]: C.H,O. +[x+ _ Z)-oz » xCO, +[y]·H20 j 4 2 2 (6) where: X – stoichiometric cocfficient for carbon; y – stoichiometric cocefficicnt for hydrogen; z - stoichiometric coefficicnt for oxygen. ...
... ive blucprint for the development of a greenhouse gas emissions inventory for the casec of complex industries such as Oil and Gas, including its specifics related to processes of Oil and Gas production and processing (flaring, fugitive emissions, etc.). The model is implemented for a case of a typical ...
... parameters. The methodological approach for estimating CO> emissions is classified into ticrs, as per the guidelines of the Intergovernmental Panel on Climate Change (IPCC). Threc ticrs are used for estimating CO> emissions, with different ticrs used for diffcrcnt source categories based on data ...Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa. "Integrative GHG Assessment in Oil and Gas Industry" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.51M
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Building learning capacity by blending different sources of knowledge
... metadata schemas are not much different from less complex standards, such as DC, which, on the other side, is compact, well explained and widely used, but lacks elements for comprehensive description of learning resources. When metadata for BAEKTEL learning resources were defined, the FAO (Food ...
... in-depth analysis of metadata requirements for BMP in view of the existing standards, a metadata model was defined based on DC with addition of some elements from LOM. The selected metadata set is expected to describe the resources sufficiently well for the user to be able to locate and assess ...
... combines DC and LOM Standard, was taken as the basis1. Compliance with DC and LOM standards was chosen in order to enable sharing of BMP metadata with other OER repositories. However, the mandatory elements for BAEKTEL learning resources had to be selected very carefully, as metadata must not ...Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić. "Building learning capacity by blending different sources of knowledge" in International Journal of Learning and Intellectual Capital (2016). https://doi.org/10.1504/IJLIC.2016.075698
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Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer
Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)... latter. Groundwater (GW) resources are vital for the economy and society, as well as for the development of both countries. Within the framework of the International Commission for the Protection of ihe Danube River (ICPDR) activities and the Roof Report for 2004 [6], the transboundary acluifer system ...
... presence of fresh groundwater, are utilized mostly for drinking water supply and for irrigation. The deeper layers are also used in the water suppiy of some cities (e.g. Szeged) or for geothermal or balneotherapeutical purposes: thermal water is used for recreation and medical purposes in several spas ...
... used for municipal water suppiy and irrigation, and the rest is employed for industrial purposes. In Serbia it is assumed that the current exploitation of the transboundary aquifer is around 2.8m3 s-1, of which 7.2m3s-t are r-rsed by individual industry and farms. Groundwater is also used for irrigation ...Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić. "Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer" in Transboundary Water Resources Management - A Multidisciplinary Approach, Weinheim, Germany : Wiley-VCH (2011): 143-149
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Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking
Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović. "Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking" in X International Scientific Congress Innovations 2024, Varna, Bulgaria, 24-27. jun 2024, Scientific Technical Union of Mechanical Engineering "Industry 4.0" (2024)
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Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024
Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek. "Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024" in Podzemni radovi, Beograd, jun 2024, Centre for Evaluation in Education and Science (CEON/CEES) (2024). https://doi.org/10.5937/podrad2444071B
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Mine ventilation system planning using genetic algorithms
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 methodsNikola Lilić, Ranka Stanković, Ivan Obradović. "Mine ventilation system planning using genetic algorithms" in 6. international symposium on mine planning and equipment selection, Ostrava (Czech Republic), 3-6 Sep 1997, A.A. Balkema, Rotterdam (Netherlands) (1997)
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Uniaxial compressive strength test before and after standard fire test on rock mass
Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)... recorded. In Figure 2 samples prepared for uniaxial compressive strength test according to SRPS EN 1926 are presented. Figure 2. Samples prepared according to SRPS EN 1926 for compressive strength test In Figure 3 samples prepared for standard fire test according to SRPS EN 1926 are ...
... tested for uniaxial compressive strength. Second group of samples consists of 6 samples exposed to standard fire test according to SRPS EN 1363-1, with the intention to test uniaxial compressive strength after standard fire test. For the sandstone rock mass of determined characteristics, for which ...
... publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Fifth symposium of the Macedonian Association for Geotechnics ISRM specialized conference © 2022 Macedonian Association for Geotechnics, ISBN 978-9989-2053-4-7 Slobodan Ćorić, Jovan Br. Papić (Eds) Uniaxial compressive strength ...Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović. "Uniaxial compressive strength test before and after standard fire test on rock mass" in Fifth symposium of the Macedonian Association for Geotechnics, Ohrid, North Macedonia, 23-25. 06. 2022, Macedonian Association for Geotechnics (2022)
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Effects of external noise on threshold-induced correlations in ferromagnetic systems
Dragutin Jovković, Sanja Janićević, Svetislav Mijatović, Lasse Laurson, Đorđe Spasojević. "Effects of external noise on threshold-induced correlations in ferromagnetic systems" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.062114
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Frequency and Length of Syllables in Serbian
Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.... values for rank-frequency distribution for word forms16 (cf. Popescu et al. 2009, pp. 137-138; the highest value of 𝑎 is 1.6543 for a Hawaiian text, i.e. for a text written in a very analytical language). It can be a consequence of the fact that the inventory of syllables is, at least for Slavic ...
... in the model for the rank-frequency distribution of syllables exceed those for words, and in the model for the distribution of syllable length they are out of the range of values observed for word length (Popescu et al., 2013, pp. 229-233).21 The different strengths of correlations (for the relations ...
... prescribed by an authority, or theoretically, establishing rules for syllable borders. Experiments were carried out e.g. by Rubach & Booij (1990) for Polish, by Schiller et al. (1996, 1997) for Dutch, and by Eddington et al. (2013a,b) for American English10. Rottmann (2002) acknowledges consultations ...Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová. "Frequency and Length of Syllables in Serbian" in Glottometrics (2019)
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Using Lexical Resources for Irony and Sarcasm Classification
The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...... collection of ironic tweets was 3In this and following examples ADJ stands for an adjective, ADV for an adverb and N for a noun. 4AH– onomatopoeic utterances (ah,eh, hi), EMO – a set of emoticons depicting positive feelings, LOL – acronym for Laughing out Loud 5SemEval 2015, Task 11 formed using an extended ...
... a tag _word. The reason for accepting this threshold is a high degree of true positives 6See for example Alexander. R., Elias-Bursać, E.: Bosnian, Croatian, Serbian, a Textbook With Exercises and Basic Grammar. University of Wisconsin Press (2010) Using Lexical Resources for Irony and Sarcasm Clas ...
... common cause for false negative tweets was: the usage of letters without diacritics (s instead of š, c instead of č or ć, z instead of ž and d or dj instead of đ ), usage of transcribed words instead of words in the BCMS languages, e.g. hepi for happy, and the repetition of some letters for emphasis, e ...Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković. "Using Lexical Resources for Irony and Sarcasm Classification" in Proceedings of the 8th Balkan Conference in Informatics (BCI '17), New York, NY, USA, : ACM (2017). https://doi.org/
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Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays
... include the existing regulatory framework in Serbia, access to land necessary for exploration/exploitation, current practise related to geological explo- ration including testing procedures and analyses, and actual standards for reporting of exploration results, mineral resources, and ore reserves in Serbia ...
... Governmental systems/standards for reporting of exploration results, mineral re- sources and ore reserves in Serbia have not been changed significantly in practice in the last 60 years, although in the Law on Mining and Geological Explorations from 2011 [56], a mandatory standard for reporting of exploration ...
... spatial planning related to the mining sector. The fourth issue concentrates on the standard for reporting exploration results, re- sources and reserves in Serbia compared to CRIRSCO derived standards, with exam- ples of some problems that occur occasionally in practice. Resources 2021, 10 ...Vladimir Simić, Dragana Životić, Zoran Miladinović. "Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays" in Resources, MDPI AG (2021). https://doi.org/10.3390/resources10060063
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Control of substructure construction of railways in the Republic of Serbia
Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...... embankment planum for depths > 2.0 m Ev2 > 20 MN/m2, Ev2/Ev1 2.2, Evd > 20 MN/m2 or Rc* > 95%; for railways in the cut Ev2 > 45 MN/m2, Ev2/ > 25 MN/m2 or Rc* > 95% where the ratio Ev2/ smaller than the minimum value prescribed for Ev2. The load-bearing capacity of the embankment layers, except for the load-bearing ...
... Note: Until the detailed zoning of Serbia on frost for all railways within the Corridor X project, adopt zone III of the area of frost for calculations. *in the Regulations Sd Table 3.Minimum values of deformability modulus and degree of compaction for embankment [2:37-38] a) Embankment height H > 2 ...
... requirements: for the construction and improvement of open track tracks and main tracks on main railways Ev2 > 120 MN/m2 > 50 MN/m2 Rc* for the construction and improvement of open railway tracks and main tracks on regional railways Ev2 > 100 MN/m2, Ev2/Ev1 2.2, Evd > 45 MN/m2, Rc* for the construction ...Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović. "Control of substructure construction of railways in the Republic of Serbia" in International Conference On Contemporary Theory and Practice in Construction XV, Banja Luka 16-17 jun 2022., University of Banja Luka Faculty of Architecture, Civil Engineering and Geodesy (2022)
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Threshold-induced correlations in the Random Field Ising Model
... data and for the same thresholds as for the distributions shown in Fig. 1b. They (also) follow power-laws = τ−D T T g T T( ) ( / ) ww w w,0 Tw , speci�ed by the value τ = . ± .1 64 0 02Tw for the exponent of the waiting time, and terminated by the cuto� scaling function gw(x), taken for Tw/Tw,0 ...
... time T0 and the cuto� waiting time Tw,0 against threshold Vth for a family of curves obtained for di�erent disorders R. For small thresholds, the cuto� waiting time grows as a power law ( ∼ .T Vw,0 th 1 3), and more rapidly than that for larger Vth. �is leads to the conclusion that if the threshold ...
... from the same data and for the same thresholds as for the distributions shown in Fig. 1b. They (also) follow power-laws D(Ty) = Tg, (T/T y,9)» specified by the value Tr, = 1.64 + 0.02 for the exponent of the waiting time, and terminated by the cutoff scaling function g,,(x), taken for T,,/T,,9, where T, ...Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević. "Threshold-induced correlations in the Random Field Ising Model" in Scientific Reports, Springer Science and Business Media LLC (2018). https://doi.org/10.1038/s41598-018-20759-6
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NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands
Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić. "NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands" in Inorganica Chimica Acta, Elsevier BV (2012). https://doi.org/10.1016/j.ica.2012.09.016