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Упит dcterms_subject_txt:rock breakage by explosives

1101 items

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • Is the Sava-Vardar zone a remnant of an Upper Cretaceous ocen? Pro et contra

    Vladica Cvetković, Dejan Prelević, Ana Mladenović (2024)
    Neotethys, ocean closure, subduction
    ... „address the possibility that the ABTS belt could have originated in a post-collisional setting. ACKNOWLEDGEMENT This research is supported by funds provided by SRI based on Contract no. 451-03-66/2024- 03/200126, as well as Science Fund of Serbia, project, RECON TETHYS (7744807). VC appreciates ...
    ... ke rocks occur at North Kozara in the form of Campanian pillow basalts and sheeted dyke dolerites of tholeiitic composition. In terms of rock petrography, these rocks are indeed quite similar to adjacent Jurassic mafic complexes that represent truc ophiolites, which made some authors believe ...
    ... magmatic series that have never been even thought of representing ophiolites, such as potassic/ultrapotassic (Ripanj near Belgrade) and andesite rock seriecs (ncar Belgrade and in boreholes in Bačka and Banat). 2) Comprehensive results of zircon provenance studies included the investigations ...

  • The Impact on Karst Aquifer Regimes Induced by a Surface Reservoir in Karst through Multiparametric Analyses (Reservoir Bileća—Herzegovina)

    Saša Milanović, Ljiljana Vasić, Branislav Petrović, Tina Dašić, Veljko Marinović, Petar Vojnović (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • From DELA Based Dictionary to Leximirka Lexical Database

    Biljana Lazić, Mihailo Škorić (2020)
    In this paper, we will present an approach in transforming Serbian language Morphological dictionaries from a DELA text format to a lexical database dubbed Leximirka. Considering the benefits of storing data within a database when compared to storing them in textual documents, we will outline some of the functionality that the database has made possible. We will also show how hand-made rules that use category labels lexical entries are marked with can be used to link lexical entries. ...
    Morfološki rečnici, jezički resursi, Leksimirka
    ... .N2:ms1v).NC:mp4”. The first part - “fakultetske bibliotekare” is a word form which is fol- lowed by the lemma “fakultetski (fakultetski.A2:adms1g) bibliotekar (librarian.N2:ms1v)”. This is followed by the code for compound nouns “NC” and grammatical categories for the masculine “m”, the plural “p” ...
    ... searched by some predefined queries that retrieve a word searched for in a context. This predefined query could replace “Plain lemma” in the drop-down menu. For example, if a lexical entry describes a noun, the predefined query “AN” retrieves occurrences (concordances) in which the word described by an entry ...
    ... paper (Stanković et al., 2018). Relations are defined through the relationship management segment of the Leximirka application, by filling in general information and by setting a set of rules that more closely define those relations. The rules themselves represent the criteria that both lexical entries ...

  • Serbian NER&Beyond: The Archaic and the Modern Intertwinned

    Branislava Šandrih Todorović, Cvetana Krstev, Ranka Stanković, Milica Ikonić Nešić (2021)
    U ovom radu predstavljamo srpski književni korpus koji se razvija pod okriljem COST Akcije „Distant Reading for European Literary History” CA16204. Koristeći ovaj korpus romana napisanih pre više od jednog veka, razvili smo i učinili javno dostupnim Sistem za prepoznavanje imenovanih entiteta (NER) obučen da prepozna 7 različitih tipova imenovanih entiteta, sa konvolucionom neuronskom mrežom (CNN), koja ima F1 rezultat od ≈91% na test skupu podataka. Ovaj model je dalje ocenjen na posebnom skupu podataka za evaluaciju. Završavamo poređenje ...
    ... pipe- line starts with SrpNER annotation, followed by POS-tagging and lemmatization by a Tree- Tagger (Schmid, 1999; Stanković et al., 2020). As a result, first 16 novels from SrpELTeC col- lection were annotated with POS, lemmas, and NE in a format agreed by the COST action. Acknowledgments This research ...
    ... pELTeC collection. The tagset used by Srp- NER differed from the simplified tagset used in the ELTeC project – the tags are more refi- ned, e.g. toponyms are classified as oronyms, hydronyms, settlements etc., and nesting of tags is allowed. Thus, the tags produced by SrpNER had to be mapped to ElTeC ...
    ... model has been further assessed on a separate eva- luation dataset. We wrap up with compa- rison of the developed model with the exi- sting one, followed by a discussion of pros and cons of the both models. 1 Introduction The “Distant Reading for European Literary History”1 (COST Action CA16204) has started ...

  • 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
    ... developed its four versions by 4The evaluation was performed as a homework by several generations of students of Library and Information Sciences at the Faculty of Philology, University of Belgrade, in the scope of the course Information Retrieval. Their work was checked by their professor, which means ...
    ... file if they start and end exactly at the same characters; weighted the match is scored by the ratio of the number of characters common to both anno- tations divided by the total number of charac- ters covered by at least one of the two anno- tations. Figure 1: The evaluation of SPACY NER, SRP- NER ...
    ... has been con- tinually improved by adding new NE classes (or- ganization names) and new sub-classes (e.g. for geopolitical names: regions, super-regions and city counties). In addition, the e-dictionaries of Serbian were also continually improved and en- hanced, and that by itself contributes to better ...

  • Results of Recent Monitoring Activities on Landslide Umka, Belgrade, Serbia—IPL 181

    Biljana Abolmasov, Uroš Đurić, Jovan Popović, Marko Pejić, Mileva Samardžić Petrović, Nenad Brodić (2021)
    Klizišta, Monitoring, GNSS, Geodetska osmatranja, UAV snimci, PSInSAR
    ... terized by intensive fluctuation of the Sava River level (drawdown effect), which started dropping from high level for several meters in a short period. Fluctuation of the river level in 2014–2015 was followed by highest river discharge during floods in May 2014, particularly enhanced by dis- charge ...
    ... Vallcebre landslide, in Spain. Since then, many published research papers pre- sented successful landslide monitoring by GNSS and its integration with other observations (gained by other geodetic instruments such as automated total stations) across the world. GNSS landslide monitoring has proved its ...
    ... measurements, with observa- tion rate of 30 s, are collected by GNSS Spider and further forwarded, in a form of RINEX files, to GeoMoS Monitor and GeoMoS Analyzer on processing and further analysis, respectively. The Umka landslide is represented by one object point (GNSS), which is located in the landslide ...

  • 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 (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications

    Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалима

  • On the distribution modulo 1 of the sum of powers of a Salem number

    Dragan Stankov (2016)
    It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • Exhumation history of the Juhor Mts. in central Serbia, the Northern Serbo–Macedonian Subunit

    Uros Stojadinovic, Hannah Pomella, Nemanja Krstekanić, Bojan Kostić, Maja Maleš, Nikola Randjelovic, Miloš Radonjić (2024)
    Northern Serbo–Macedonian Subunit, low-t thermochronology, kinematic analyses, extensional deformations

  • Single and multi-phase inclusions in garnets from the Lešnica alluvion in the Internal Dinarides, Serbia

    Maja Milošević, Bojan Kostić (2021)
    ... published by Milošević et al, [1]. Crystals, that havebeen extracted and separated from the sandy fraction, have exhibited the presence of varioustypes of inclusions in their structure. Single and multiphase inclusions in the garnets wereexamined optically by petrographic methods followed by SEM-EDS method ...
    ... Jelić I. 2019. Garnets from river Lešnica alluvion, mountain Cer. IIKongres Geologa Bosne i Hercegovine sa medjunarodnim učešćem, Pp. 306-311 Powered by TCPDF (www.tcpdf.org) http://www.tcpdf.org ...

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... Mathematics, Universityof Niš, Fišegradska 33, 18000 Niš, Serbia CooSlHop,MoO, nanopowders were obtained by applying glycine nitrate procedure (GNP). The synthesized samples were investigated by DTA, X-ray diffraction (KRD), Fourier transform infrared (FT-IR) spectra, Spectroscopy, Field emission ...
    ... _N 7CS CS - 20 23 the Serbian Society for Ceramic Materials { June 14-16. 2023. Belgrade Serbia — , b " AYNR 1 / V M_ TMK a 780 T / – Edited by: Branko Matović Jelena Maletaškić Vladimir V. Srdić 7 Conference of The Serbian Society for Ceramic Materials Programme and Book of Abstracts ...
    ... for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia ; [organizers] The Serbian Society for Ceramic Materials ... [et al.] ; edited by Branko Matović, Aleksandra Dapčević, Vladimir V. Srdić. - Belgrade : Institut za multidisciplinarna istraživanja, 2023 (Belgrade : Faculty of technology ...

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... residence ime and the degree of water-rock interaction, groundwater mixing, with water of different hydrochemical composition, human activity, etc. [3,8-12]. The conditions required for the formation of subthermal and thermal karst ground- waters were created by the process of deep karstification ...
    ... values of 6!5C in the borehole groundwater during the sampling, period and 80C in the host rock for the Beljanica Massif, gave the result that these are young, modern waters, with age that cannot be determined by carbon analysis, considering that this method is used for the detection of very old waters ...
    ... Sustainability 2023, 15, 11146 10of14 the Krupaja system and in the Beljanica Massif itself. However, by including the value of 6UC of thermal spring groundwater and &I9C in the host rock for the Beljanica Massif, it was calculated that the age of the water is 3990 years, which indicates that ...

  • 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
    ... direction, with variable thickness of 6.95-34.0 m (Lazarević 1994). The rock mass is built of Upper Cretaceous limestone, which belongs to the Cenomanian age (Dimitrijević 1996). Tectonically, the rock mass is fragmented into blocks by a system of faults and fractures that reduce the possibility of ...
    ... Klisura; b Skrzut; c Struganik; d Tisnica analysis, indicates that these sediments are of Campanian age (Gajić 2007). Tectonically, the rock mass is charac- terized by the presence of longitudinal, parallel faults extending in a N-NW direction with an E-NE dip of 50% 60%. Limestone exploitation is ...
    ... freeze-thaw cycles they have decreased by 20-27 %. A small decrease in compressive strength of the Struganik limestone (after the frost test), compared to the expected decrease in strength in water saturated sam- ples, may be due to the heterogeneity of the rock mass, 1.e., tested samples. All observed ...

  • 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
    ... 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 use of firewood for heating without ...
    ... unit of the physical weight of materials) are obtained from the Ecoinvent 3.0 database (expressed by GWP100 per kg) [24] and the EPA stationary combustion emission factors inventory [23] (expressed by GWP100 per kg). Table 3. LCA of firewood-based HS - SMEDEREVAC 7 NEW LINE MBS [21], [23], [24] ...
    ... performance of heating systems using GWP index, expressed through CO2-eq emissions. According to the results, wood pellet furnace could reduce emissions by 38% compared with the firewood stove. The results showed that wood pellet furnace has a lower negative impact on the environment and climate change ...

  • Reducing environmental impact caused by mining activities in limestone mines

    Radmila Gaćina, Bojan Dimitrijević (2022)
    Mining and its related activities have always resulted in changes in the environment and these changes can vary from one area to another. As a result of mining, several types of changes can be distinguished: destruction of land and existing vegetation, changes in terrain topography, modification in air quality, changes in surface and groundwater quality, as well as change geotechnical conditions of the rock. Environmental impact of mining have been a public concern. There is widespread global interest in mining ...
    uticaj na životnu sredinu, rudarstvo, degradirana područja, održivost, rekultivacija

  • Malathion-induced inhibition of human plasma cholinesterase studied by the fluorescence spectroscopy method

    V. M. Pavelkić, K. S. Krinulović, J. Z. Savić, M. A. Ilić (2008)
    The in vitro effect of technical grade malathion was assessed via the kinetic parameters of human plasma butyrylcholinesterase (BChE) using N-methylindoxyl acetate as a substrate for BChE. An inhibitor kinetics study demonstrated the existence of a biphasic inhibition curve, indicating high- and low-affinity binding sites of malathion. The IC50 values as calculated from the experimental inhibition curves were 1.33 × 10–9 and 1.48 × 10–5 M for the high- and low-affinity binding sites, respectively; Hill’s analysis gave 1.29 × ...
    Малатион, инхибиција, хумана плазма холинестераза, метода флуоресцентне спектроскопије