Претрага

Упит dcterms_subject_txt:mining technology

467 items

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... arsenic concentrations (Fig. 6) and assessment of the risks incurred through drinking water. According to the Provincial Secretariat of Science and Technology Development, more than 600,000 inhabitants of Banat and Bačka (or some 40% of the population of Vojvodina) obtain drinking water sup- ply with arsenic ...
    ... Poisoning in Bangladesh, [Online] 2011: http://www.sos-arsenic.net/ english/natural_origin/1.html#sec4 19. PROVINCIAL SECRETARIAT OF SCIENCE AND TECHNOLOGY DEVELOPMENT (PSSTD). Water Supply and Water Protection Strategy for the Autonomous Province of Vojvodina. University of Novi Sad, Faculty of Science ...
    ... у слободном приступу. - Претрага репозиторијума доступна је на www.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 ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina

    Tina Dašić, Ljiljana Vasić (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary Change

  • Towards the semantic annotation of SR-ELEXIS corpus: Insights into Multiword Expressions and Named Entities

    Cvetana Krstev, Ranka Stanković, Aleksandra Marković, Teodora Mihajlov (2024)
    Овај рад представља активности на развоју корпуса ELEXIS-sr, српском додатку вишејезичном анотираном корпусу ELEXIS-а, који се састоји од семантичких анотација и репозиторија значења речи. ELEXIS је паралелни вишејезични анотирани корпус на десет европских језика, који може да се користи као вишејезички репер за евалуацију европских језика са мање и средње развијеним ресурсима. Фокус овог рада је на вишечланим изразима и именованим ентитетима, њиховом препознавању у скупу реченица ELEXIS-sr и поређењу са анотацијама на другим језицима. Разматрају се први кораци ...
    полилексемске језинице, именовани ентитет, вишезначност значења речи, складиште смисла, LLOD

  • 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

  • Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study

    Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović (2019)
    Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...
    tecišta, modeliranje, RAMMS, DEM
    ... M, Kowalski J, Bartelt P (2010a) RAMMS: Numerical simulation of dense snow avalanches in three-dimensional terrain. Cold Regions Science and Technology, 63, 1–14. . Frank F, McArdell BW, Oggier N, Baer P, Christen M, Vieli A (2017) Debris flow modeling at Meretschibach and Bondasca catchment ...
    ... у слободном приступу. - Претрага репозиторијума доступна је на www.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 ...
    ... in RAMMS - Selanac case study Jelka Krušić(1) , Biljana Abolmasov (1) , Mileva Samardžić-Petrović(2) 1) University of Belgrade, Faculty of Mining and Geology, Belgrade, Đušina 7, +381 11 3219225 2) University of Belgrade, Faculty of Civil Engineering, Belgrade, Bul. Kralja Aleksandra 73, +381 ...

  • Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia

    Jelka Krušić , Biljana Abolmasov, Miloš Marjanović (2021)
    The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...
    tecišta, zadržavanje nanosa, RAMMS, validacija

  • Energetska efikasnost elektromotora na površinskim kopovima

    Snežana Aleksandrović, Ilija Jeftenić (2023)

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... important to evaluate RESs from a lifecycle perspective and to consider emissions in the fuel chain and the manufacturing of the energy conversion technology. Indicator ‘‘Lifecycle GHG emissions per unit of final energy delivered’’ (IPC, 2014), measured in kg of carbon dioxide (CO2) - equivalents (CO2eq/MWh) ...
    ... and%20Procedure%20for% 20Acquiring%20the%20Status%20of%20PPP%20SG%208-13.pdf. IPCC (Intergovernmental Panel on Climate Change), 2014. Anex III, technology- specific cost and performance parameters, cambridge. available at: https: //www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5_annex-iii.pdf. ...
    ... Energy Rev 110, 101–117. Shen, Y., Lin, G., Li, K., Yuan, B., 2010. An assessment of exploiting renewable energy sources with concerns of policy and technology. Energy Policy 38 (8), 4604–4616. Strantzali, E., Aravossis, K., Livanos, G.A., 2017. Evaluation of future sustainable electricity generation a ...

  • Contribution to the geotechnical classification of municipal waste landfills in Serbia

    Dragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić (2018)
    Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental Engineering

  • Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian

    Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić (2020)
    The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...
    Part-of-Speech tagging, lemmatization, corpus, evaluation, Serbian, morphological dictionary
    ... Part-of-Speech, but different lemma cannot coexist in the full lexicon.” A new TreeTagger was produced for this research – TT19, based on the same technology as TT11, the only difference being the set of resources used for training. Both the train- ing corpus and the lexicon were expanded. Several smaller ...
    ... analysis of serbian with conditional random fields and large-coverage finite-state resources. In Zygmunt Vetu- lani, et al., editors, Human Language Technology. Chal- lenges for Computer Science and Linguistics. LTC 2015. Lecture Notes in Computer Science, vol 10930., pages 277–289. Springer International ...
    ... у слободном приступу. - Претрага репозиторијума доступна је на www.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 ...

  • Претрага корпуса заснована на употреби екстерних лексичких ресурса путем веб-сервиса

    Милош Утвић, Ранка Станковић, Александра Томашевић, Михаило Шкорић, Биљана Лазић (2019)
    У раду се разматра хибридни приступ претрази корпуса, илустрован на примеру алатки OCWB и NoSketch Engine, примењених на специјални корпус из области рударства (РудКор) и Корпус савременог српског језика (СрпКор). Разматрани приступ комбинује постојеће могућности алатки OCWB и NoSketch Engine, које своју претрагу заснивају на лингвистичкој анотацији корпуса, са новим могућностима претраге у виду консултовања екстерних језичких ресурса (морфолошки електронски речници српског језика и лексичка база података Српски ворднет). Хибридни приступ је реализован надоградњом вебсучеља која поменуте алатке користе ...
    корпус, рударство, претраживање информација, проширивање упита, лексички ресурси, лексичке релације
    ... Томашевић и др. 2018: Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović and Božo Kolonja, “Managing Mining Project Documen- tation Using Human Language Technology”, The Electronic Library, 36/6, 993–1009, DOI: 10.1108/EL-11-2017-0239, https:/doi.org/10.1108/EL-11- 2017-0239. Милош ...
    ... Duško Vitas and Ivan Obradović, “Using Textual and Lexical Resources in Developing Ser- bian Wordnet”, Romanian Journal of Information Science and Technology, 7/1–2, 147–161. Крстев 2008: Cvetana Krstev, Processing of Serbian — Automata, Texts and Elec- tronic Dictionaries. Belgrade: Faculty of Philology ...
    ... у слободном приступу. - Претрага репозиторијума доступна је на www.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 ...

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... to the Danube, and is the only mine with underwater coal exploitation in the world. A continuous technology performs the exploitation of overburden, gravel, and coal in this deposit. In accordance, mining of overburden and gravel is performed by using a bucket-chain dredger “5630” (Figure 2), while coal ...
    ... the “in situ” working conditions of mining, i.e., cutting. Keywords: cutting resistance; underwater mining; coal 1. Introduction Continuous mining systems, including bucket-wheel excavators (BWE) and bucket- wheel dredges (BWD), have been used in high-volume mining operations for decades. These excavators ...
    ... the “in situ” working conditions of mining, i.e., cutting. Keywords: cutting resistance; underwater mining; coal 1. Introduction Continuous mining systems, including bucket-wheel excavators (BWE) and bucket- wheel dredges (BWD), have been used in high-volume mining operations for decades. These excavators ...

  • Modern self-propelled surface drill rigs for drilling small diameter holes in mining and construction operations

    Milanka Negovanović, Lazar Kričak (2021)
    Приликом одређених рударских или грађевинских радова потребно је извршити минирање применом бушотина малог пречника. Раније, бушење бушотина малих пречника се изводило углавном ручним бушилицама или лаким лафетним бушилицама нa одређеним нoсачима. Проблеми у овим случајевима били су капацитет бушења, бушење већих дужина бушотина и посебно безбедност оператера на неприступачним теренима, где је његово присуство било неопходно. Данас постоје модерне самоходне бушилице за бушење минских бушотина малог пречника, које су у потпуности даљински управљане. Радио даљинска контрола омогућава да се ...
    Бушилице,бушотине малог пречника, бушење, минирање,изградња,минирање негабарита, радио даљинска контрола

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... 1016/0166­5162(95)00032­1 FINKELMAN, R.B. (1994): Modes of occurrence of potentially hazardous elements in coal: levels of confidence.– Fuel Procesing Technology, 39, 21–34. doi: 10.1016/ 0378­3820(94)90169­4 FINKELMAN, R.B., OREM, W., CSTRANOVA, V., TATU, C.A., BELKIN, H.E., ZHENG, B., LERCH, H.E., MAHARAJ ...
    ... HUFFMAN, G.P., KOLKER, A., CROWLEY, S., PAL­ MER, C.A. & FINKELMAN, R.B. (2000): Mode of occurrence of chromium in four US coals.– Fuel Processing Technology, 63, 79–92. doi: 10.1016/j.coal.2003. 10.009 INTERNATIONAL COMMITTEE FOR COAL PETROLOGY (ICCP), (2001): The new inertinite classification (ICCP ...
    ... Borntraeger, Berlin. VASSILEV, S. & VASSILEVA, C. (1998): Comparative chemical and mineral charac­ terization of some Bulgarian coals.– Fuel Processing Technology, 55, 55–69. doi: 10.1016/S0378­3820(97)00079­9 VASSILEV, S. & VASSILEVA, C. (2009): A new approach for the combined chemical and mineral clas ...

  • Hydrogeochemistry of Uranium in the Groundwaters of Serbia

    Marina Ćuk, Maja Todorović, Petar Papić, Jovan Kovačević, Zoran Nikić (2015)

  • Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema

    Svetlana M. Štrbac-Savić (2016-06-10)
    Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...
    podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija
    ... production. In the context of mining business, operational efficiency refers to the length of time until mineral assets are transformed to money. Peak operational efficiency occurs when the right combination of mineral deposit characteristics, human resources, mining technology, and mineral processing ...
    ... processing come together to optimize mining performance. Operational efficiency is related to finding the very best way of mining to produce a mineral asset. It enables management of the mining company to increase productivity, increase profitability, improve competitiveness, use freed-up capacity, and ...
    ... the operational efficiency. Having the ability to plan for these uncertainties is increasingly recognized as critical to long-term mining company success. In the mining industry in particular, the relationships between input variables that are controllable and those that are not and the physical and ...

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multi-word units, noun phrases, query expansion
    ... systems that support work with this dictionary format were developed, Unitex [2] and Nooj [3], both of which are based on the use of finite-state technology. Serbian e-dictionaries of simple forms have reached a considerable size: they have a total of more than 126,000 lemmas [4] generating more than ...
    ... procedure was Fig. 2. Components of the software tool LeXimir LeXimir, 1 a multipurpose tool developed by the University of Belgrade Language Technology Group [10] to support com- putational linguists in developing, maintaining and exploiting e-dictionaries. LeXimir is written in C#, and operates ...
    ... у слободном приступу. - Претрага репозиторијума доступна је на www.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 ...

  • Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking

    Ranka Stanković, Milica Ikonić Nešić, Olja Perisic, Mihailo Škorić, Olivera Kitanović (2024)
    U radu se prikazuju rezultati istraživanja vezanih za pripremu paralelnih korpusa, fokusirajući se na transformaciju u RDF grafove koristeći NLP Interchange Format (NIF) za lingvističku anotaciju. Pružamo pregled paralelnog korpusa koji je korišćen u ovom studijskom slučaju, kao i proces označavanja delova govora, lematizacije i prepoznavanja imenovanih entiteta (NER). Zatim opisujemo povezivanje imenovanih entiteta (NEL), konverziju podataka u RDF, i uključivanje NIF anotacija. Proizvedene NIF datoteke su evaluirane kroz istraživanje triplestore-a korišćenjem SPARQL upita. Na kraju, razmatra se povezivanje Linked ...
    paralelni korpusi, povezivanje imenovanih entiteta, prepoznavanje imenovanih entiteta, NER, NEL, povezani podaci, NIF, Vikipodaci

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)