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369 items

  • Flyrock induced by blasting in surface mining

    Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)
    Miniranje predstavlja i dalje najefikasniji i najjeftiniji način eksploatacije velikih količina čvrstih mineralnih sirovina na površinskim kopovima. Energija eksplozije se koristi za fragmentaciju čvrste stenske mase do zahtevane granulacije. Pored pozitivnih efekata miniranja, postoje i određeni neželjeni efekti svakog procesa miniranja koji se mogu javiti, a to su: potresi tla, razletanje komada stene, vazdušni udari, otrovni i zagušljivi gasovi i prašina. Razletanje komada stene je nekontrolisano izbacivanje fragmenata odminirane stenske mase i predstavlja jedan od glavnih izvora materijalne štete ...
    razletanje, bušenje, miniranje, površinska eksploatacija, bezbednost, nesreća

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • Konceptualni model hidrogeotermalnog sistema šire okoline Brusa - geotermalna karakterizacija sistema / Conceptual model of hydrothermal system of Brus area - system geothermal characterization

    Dejan Milenić, Ana Vranješ, Marinko Toljić, Ivana Vasiljević, Natalija Radosavljević, Matija Ognjanović (2024)
    Postavljeni konceptualni model hidrogeotermalnog sistema Brusa sa širom okolinom testiran je primenom različitih hidrohemijskih i izotopskih metoda u cilju njegove verifikacije i karakterizacije. Rezultati su ukazali na atomsfersko poreklo geotermalnih fluida i na razviće primarnih rezervoara u okviru karbonatnih stena. Prvi rezervoar formiran je u okviru krečnjaka gornjotrijakse starosti, dok drugi rezervoar egzistira u okviru trijskaih mermera. Zone prihranjivanja locirane su u zapadnom delu terena. Sistemi gravitacionih raseda kontrolišu kretanje fluida u sistemu, dok proces jonske izmene dominira u ...
    hidrogeotermalni sistem, hidrohemijske i izotopske metode, mladi intruzivi

  • Bezbednosna rastojanja u jamskim magacinima eksploziva u domaćoj i međunarodnoj praksi

    Luka Crnogorac, Ognjen Popović, Toma Jovičić, Veljko Lapčević (2024)
    Projektovanje jamskih magacina eksploziva predstavlja složen inženjerski problem. Sama namena jamskih magacina zahteva ispunjenost niza uslova koji se odnose na bezbedno pozicioniranje magacina, ispunjenost uslova ventilacije, pristupa, rukovođenja magacinom, načina skladištenja eksplozivnih sredstava, protivpožarne zaštite, elektro zaštite itd. Veoma važan parametar prilikom projektovanja jamskih magacina eksplozivnih sredstava predstavlja minimalno sigurnosno rastojanje između susednih komora u kojima su smeštena eksplozivna sredstva u cilju sprečavanja potencijalnog neželjenog dejstva vazdušnog udarnog talasa, razornog dejstva eksplozije i seizmičkog dejstva eksplozije. U ovom radu su prikazani ...
    jamski magacini, eksplozivi, bezbednosna rastojanja
    ... designing underground explosives magazines is the minimum safety distance between adjacent chambers where explosives are placed in order to prevent the potential unwanted effect of the air shock wave, the destructive effect of the explosion and the seismic effect of the explosion. This paper will present ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... describe a word means that all the constructions it participates in should be identified as well as “all those through which its full semantic potential is to be expressed” (Atkins & Rundell, 2008: 252) should be recorded in the lexicographic database. The concept of lexicographic relevance was ...
    ... are using (SASA examples and control) and produced data summaries. These were analysed by lexicographers, on the basis of which parameters for potential example cleaning were deduced and threshold values for them were defined. Table 1 presents the data summary from SASA dictionary for five representative ...

  • FrameNet Lexical Database: Presenting a Few Frames Within the Risk Domain

    Aleksandra Marković, Ranka Stanković, Natalija Tomić, Olivera Kitanović (2021)
    U radu se daje kratak prikaz teorije semantike okvira, na kojoj je zasnovana leksička baza Frejmnet. Predstavljena je koncepcija ove mreže, kao i mogućnosti njene primene. Predstavljena je i leksička analiza koja se primenjuje u projektu izrade Frejmneta i ukazano na razlike između analize zasnovane na okviru u odnosu na analizu zasnovanu na reči. Zatim je prikazano nekoliko povezanih okvira koje prizivaju reči iz domena rizika. U radu je predstavljena i platforma NLTК pomoću koje se mogu koristiti ...
    Srpski jezik, semantika okvira, FrameNet, scenario rizika, rudarski korpus, obrada prirodnog jezika
    ... in the corpus, the context in which it is used provided by corpus examples, as well as all the phrases in which the LU fulfills its full semantic potential. This approach consists of listing all LU arguments and adjuncts crucial to describing its meaning. Special attention is given to words that cannot ...
    ... this case passive participles of verbs: increased (повећан)/ identified (идентификован)/ assessed (процењен)/. . . risk (ризик) or ad- jectives: potential (потенциjалан)/ political (политички)/ unacceptable (неприхватљив)/ . . . risk (ризик). The third column contains the verbs with which ризик appears ...

  • 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

  • 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

  • Процена ризика од удеса на флотацијском јаловишту "Ваља Фундата

    Милица Илиевски (2024)
    У овом завршном раду под називом: „Процена ризика од удеса на флоатацијском јаловишту „Ваља Фундата““ кроз 8 поглавља описане су примењене методе за управљање флотацијском јаловином, као и могући сценарији удеса који могу настати услед нестабилности брана или природних катастрофа.Рад користи технике попут FMEA и ALARP за анализу ризика, при чему се ризик дефинише као функција вероватноће и последица инцидента.Препоручене су мере за смањење ризика и унапређење стабилности брана,укључујући редовно одржавање и надградњу инфраструктуре.Резултати рада указују да је ризик ...
    флотацијска јаловина, процена ризика, рушење бране, удеси, еколошке последице
    ... at the Valja Fundata Flotation Tailings Facility," describes in eight chapters the applied methods for managing flotation tailings, as well as potential accident scenarios that could occur due to dam instability or natural disasters. The paper employs techniques such as FMEA and ALARP for risk ...
    ... overflow due to heavy rainfall is considered "very low" due to the tailings facility”s capacity to accommodate large volumes of water. Regarding potential human casualties, the worst-case scenario estimates up to 144 victims, while the average number would be around 62, depending on the speed of ...
    ... evacuation and the direction of the flood wave. The Valja Fundata flotation tailings facility is classified in Category A due to potential significant environmental consequences, including long-term pollution of water, soil, and air, as well as the risk to the health of the local population living ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... resources in the concept of sustainable development -– financed by the Ministry of Science and technological development, ON146018 (2008-2010), "Potential and bases Jfor sustainable use of groundwate!' Min. of Science and Education, No. 176022, "Fvaluation of the Impact of Climate Change on Water ...
    ... https://doi.org/10.1007/s10040-020-02251-6 . Vasić, Lj., Živojinović, D., Rajaković-Ognjanović, V., Huang, F., }ianhua, C. (2021): The subthermal potential of karstic groundwater of Kučaj-Beljanica region in Serbia estimated by the multivariate analysis. Environmental Farth Science 80: 120. https://doi ...
    ... Journal, 25:771—785, https://doi.org/10.1007/s10040-016-1519-3 Čokorilo Ilić, M., Stevanović, Z., Ristić Vakanjac, V. (2016): Fnvironmental aspect and potential impact of proposed water transfer scheme in „east Herzegovina, Environmental Farth Science. Springer, 75:35, https://doi.org/10.1007/s12665-015-5147-3 ...

  • 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
    ... highly inflective languages, such as Serbian. Of special importance is LeXimir, a tool developed within this group that greatly enhances the potential of manipulating each particular lexical resource as well as several resources simultaneously [10]. Although the resources and tools have already ...

  • Part of Speech Tagging for Serbian language using Natural Language Toolkit

    Ranka Stanković, Boro Milovanović (2020)
    Dok se razvijaju složeni algoritmi za NLP (obrada prirodnog jezika), osnovni zadaci kao što je označavanje ostaju veoma važni i još uvek izazovni. NLTK (Natural Language Toolkit) je moćna Python biblioteka za razvoj programa zasnovanih na NLP-u. Pokušavamo da iskoristimo ovu biblioteku za kreiranje PoS (vrsta reči) oznake za savremeni srpski jezik. Jedanaest različitih modela je kreirano korišćenjem NLTK API-ja za označavanje. Najbolji modeli se transformišu sa Brill tagerom da bi se poboljšala tačnost. Obučili smo modele na označenom ...
    obrada prirodnog jezika, mašinsko učenje, neuronske mreže
    ... origin. It will be exempted from the training and validation phases and will be used at the end of the evaluation phase to test generalization potential of the created models. We took this data from a ParCoTrain dataset [15] and mapped their tagset (which we called PCT_POS) to the SMD_POS tagset ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... weather station point data. Further maps might involve any other available historic period as a baseline, or even future projections, to enclose potential climate change effects. Figure 5. Landslide susceptibility model of the area. Figure 6. Annual rainfall distribution map of the area ...

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    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 ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • Konceptualni model hidrogeotermalnog sistema šire okoline Brusa - geološki, geofizički i hidrogeološki uslovi / Conceptual model of hydrothermal system of Brus area - geological, geophysical and hydrogeological condition

    Dejan Milenić, Ana Vranješ, Marinko Toljić, Ivana Vasiljević, Natalija Radosavljević, Matija Ognjanović (2024)
    Na širem području Brusa izvedena su naučna multidisciplinarna istraživanja za potrebe ocene geotermalnog potencijala sa zadatkom de9inisanja uslova formiranja geotermalnih i termomineralnih resursa. Interpretacijom podataka zaključeno je da je na predmetnom terenu formiran "hibridni" hidrogeotermalni sistem, koji sadrži elemente sistema u rov-strukturi i elemente konvektivnog hidrogeotermalnog sistema sa rezervoarom u pokrivaču granitoidne intruzije. Sistem čine dva nezavisna hidrogeotermalna rezervoara. Prvi rezervoar formiran je u gornjokrednim krečnjacima na dubini od oko 1550 m. Maksimalne prognozne temperature hidrogeotermalnih resursa u krečnjačkom ...
    hidrogeotermalni sistem, gornjokredni krečnjaci, trijaski mermeri, Brus

  • 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

  • Prostorni položaj ofiolita istočne Vardarske zone: geofizičko-geološki model i njegove geodinamičke implikacije

    Dragana D. Petrović (2015-12-29)
    Centralni deo Balkanskog poluostrva je geotektonski veoma složen. Tetis je zatvorentokom gornjeg mezozoika, a ofioliti na zapadu i ofioliti Vardarske zone predstavljajuostatke nekadašnjih okeanskih prostora. Najistočniji deo Vardarske zone razlikuje se odsvih ostalih ofiolita na Balkanskom poluostrvu i karakteriše se najizraženijim suprasubdukcijskimafinitetom. Istočna vardarska zona locirana je u centralom delu Srbije.Na severu se prostire do Apusena u Rumuniji, a na jugu obuhvata cetralni deoMakedonije i Peonias zonu u severnoj Grčkoj. Istočna vardarska zona se nalazi istočnood geotektonske jedinice Kopaonik ...
    Istočna vardarska zona; ofioliti; 2D i pseudo 3D geofizičko-geološkimodel; geodinamička evolucija
    ... Andronikov, A.V., Jacob, D. E., Melzer, S., 2006. Evidence from Antarctic mantle peridotite xenoliths for changes in mineralogy, geochemistry and geothermal gradients beneath a developing rift, Geochim. Cosmochim. Acta 70, 3096–3120, doi: http://doi.org/10.1016/j.gca.2006.03.010. http://doi.org/10 ...
    ... G. R. J., Cowan, D. R. D., 2006. Enhancing potential field data using filters based on the local phase, Computers & Geosciences, 32, 1585–1591, doi: 10.1016/j.cageo.2006.02.016. Cooper, G. R. J., Cowan, D. R. D., 2008. Edge enhancement of potential-field data using normalized statistics. ...
    ... of Greece, Evzoni sheet, 1:50.000, Institute of Geology and Mineral Exploration. Miller, G. H. and Singh, V., 1994. Potential field tilt-a new concept for location of potential field sources. Journal of Applied Geophysics 32, 213-217, doi:10.1016/0926-9851(94)90022-1. Mohanty, C., Baral, D. ...

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... new sites and raising use of modern technology of exploitation, etc.) [45,46]. The aim of this study was to investigate the energy security of the potential development of natural gas sector in Serbia, and to create a model that comprehensively analyzes energy security even from the aspect of partial ...
    ... is presented through a representative partial grade which is the worst among the best expected partial grades [48,49]. For phenomena that carry potential negative connotations (risk, safety, etc.), the max–min composition is considered better [50]. According to [51], based on mathematical analysis, ...
    ... synthesis was performed using the appropriate fuzzy composition. Several models of composition were mentioned in the literature. For phenomena that carry potential negative connotations (risk, safety, etc.), the max–min composition was better considered [50]. According to [51], it has been proven that the max–min ...

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... text=geosciences_theses, 2012. [7] McGuinness, D.: Ontologies Come of Age. Spinning the Semantic Web: Bringing the World Wide Web to Its Full Potential, Dieter Fensel, J im Hendler, Henry Lieberman, and Wolfgang Wahlster, editors. MIT Press, 2003. [8] Obradović, I., Ignjatović, D., Stanković, R ...

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... executing of mine surveying. Of�cialGazette of the Republic of Serbia, n. 40, p. 841-845, 1997. [In Serbian] KESSLER, H. et alii. Unlocking the potential of digital 3D geological subsurface models for geotechnical engineers. In: EUROPEAN ECONFERENCE OF THE INTERNATIONAL ASSOCIATION FOR ENGINEERING ...