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Упит dcterms_subject_txt:rock breakage by explosives

1113 items

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... of keywords annotated by a human (A) and a set of keywords annotated using algorithm (B) divided by the number of keywords annotated using the algorithm: P = A ∩ B B . (1) The recall is calculated as the number of keywords in the intersection of a set of keywords annotated by a human and a set of keywords ...
    ... maximal number of words in rows for each category presented by columns. The first column is related to the numbers of words in the text, the KW count lists the number of keywords given by an author, while KW in the text shows how many keywords given by an author are actually present in the abstract. The difference ...
    ... keywords annotated using the algorithm divided by the number of keywords annotated by a human: R = A ∩ B A . (2) The F1 score is the harmonic mean of precision and recall, calculated as: F1 = 2PR P + R . (3) 3 Textual Resources In this experiment, we have used abstracts from the scientific journal ...

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    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 ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... be achieved if the major sources of emissions arc targeted. The ambition of this paper is to entify major sources and provide a breakdown by activity and by consequently emitted greenhouse gas for a typical onshore oil and gas production and processing facility, including fugitivc emission and flaring ...
    ... where: EcgG,uer (EmissionSguG,e) - Emission of a GHG by type of fuel, [kg]; FCer (Fuel Consumptionje) - Amount of heat energy produced in combustion processes, [T]]; EFauacyur (Emission FactorcHcye) — Average emission factor ofa given GHG by type of fuel, [kg/T]]. Tier 2 Approach The tiecr ...
    ... determining emissions from flaring is presented by API Compendium 2021. Thc methodology recognizes thc flare combustion process as incomplete and therefore recommends the usage of Combustion Efficiency. In case that Combustion Efficiency is not provided by the manufacturer, or it is mcasured, the usage ...

  • Pre-failure deformation monitoring as rockfall prediction tool

    Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić (2021)
    General Engineering
    ... in the rockfall-predictive context by Rosser et al. [2] describes not only the temporal and spatial changes of a rock face but uses precursory patterns to predict large rockfall events by a succession of small events. They confirmed indications from other rock cuts or steep cliffs investigations ...
    ... retreat of the fallen rock mass is expectedly in the upslope direction. The SSE-facing joint set (daylighting on the rock face) and E-facing set sever medium-sized blocks, undercut by the bedding plane (dipping into the mass), causing combined free-fall (more dominant) and rock-slide (subordinate ...
    ... independently from their actual driving agent as long as the rock bridge strength allows it under progressive failure assumption. Janeras et al. [6] analyzed the famous Monserrat Mt. near Barcelona, by using different monitoring Mechanics and Rock Engineering, from Theory to Practice IOP Conf. Series: ...

  • The analysis of the geothermal energy capacity for power generation in Serbia

    Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)
    Renewable Energy, Sustainability and the Environment
    ... generated by some generally recog- nized method (Rankine or Kalina cycle). Naturally, an interpretation of the silicon concentration in water is somewhat uncertain for the unknown solid phase controlling silicon (quartz or chal- cedony). Moreover, the mixing with shallow groundwater and the rock-water ...
    ... C] (SiO2 � � � � 1309 519 27315 [ . log )] . (1) Fluid temperatures from 120° to 180° indicated by the quartz geothermometer suggest that the silicon solubility in water is probably controlled by chalcedony, and therefore the for- mula for chalcedony thermometer is [1]: t [ C] (SiO2 � � � � ...
    ... frequently uses the formula [7]: _ 1309 [5.19 — log(SiO, )] Fluid temperatures from 120° to 180° indicated by the quartz geothermometer suggest that the silicon solubility in water is probably controlled by chalcedony, and therefore the for- mula for chalcedony thermometer is [1]: t[°C] ~27315 (1) 1112 7 ...

  • Extreme Rainfall Event and Its Aftermath Analysis—IPL 210 Project Progress Report

    Biljana Abolmasov, Mileva Samardžić Petrović, Ranka Stanković, Miloš Marjanović, Jelka Krušić, Uroš Đurić (2021)
    Landslides, Extreme precipitation, Data analysis, IPL project report

  • Karst aquifer impact on the formation of surface runoff: case study of the Resava River catchment, Serbia

    Marina Mitrašinović, Vesna Ristić Vakanjac, Veljko Marinović, Saša Milanović, Ljiljana Vasić, Dušan Polomčić (2022)
    The paper compares the flow regimes of the Resava River at the gauging stations of the Manasija Monastery (upper course) and the town of Svilajnac (lower course). The hydrological analysis encompasses a multiyear period of monitoring (1982–2020). The water budget and baseflow index are assessed for the catchment areas monitored by the Svilajnac station (683 km2) and the Manasija Monastery station (358k m2), considering the overall monitoring period and characteristic years. The results indicate that the specific runoff in ...
    hydrogeological characteristics, water regime, water balance, karst aquifer, Resava catchment area
    ... Quater- nary and Ncogene sediments. Thcy are recharged by infiltration of precipitation, water from surface strecams, and in part by karst aquifer groundwater. They are drained directly into the river, generally during dry periods, but largely by wells that service public and industrial water supply ...
    ... limestones. 3. Karst aquifer in the castern, upper part of the catchment, characterized by favorable filtration properties. Groundwater flows in developed systems of fractures and caverns. This aquifer is recharged by infiltration of precipitation and water from sink- ing streams. It is discharged via ...
    ... groundwa-– ter flow into adjacent semi-permcable sediments, and in part by evapotranspiration. Springs are gen- erally found at points of contact between carbon- ate and non-carbonate rocks, and their positions are governed by fault structures and fracture systems. 4. In addition to these aquifer ...

  • A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice

    Nikola Lilić, Ivan Obradović, Ranka Stanković (2002)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...
    ... ion.2,11 In the same way, the characteristics of an object are represented by its attributes, and frame characteris- tics are represented by its slots. Namely, slot values describe attributes of the object represented by the frame and its relations to other frames (objects) in the system. The ob ...
    ... using a rule ed- itor as shown in Fig. 9. The problem-solving process in VENTEX unfolds by means of the KAPPA-PC backward chaining inference engine. Goals to be satisfied by backward chaining are defined by means of the goal editor. The goals in VENTEX pertain to estimation of different parameter ...
    ... on available mine ventilation software as well as on the possibilities offered by the coupling of various artificial intelligence (AI) methods in the solution of complex problems that cannot ade- quately be solved by a single AI method. The core of the implemented approach is a hybrid intelligent ...

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... results of remote sensing by property type, by district, municipality, by mineral resource or method of registration and the like are also available. Apart from general statistics related to polygons obtained by remote sensing and classified by property type, by district and by municipality, the analytical ...
    ... (accessed on 1 October 2014). © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). ...
    ... same time reducing atmospheric emissions of methane [2]. A study by University of Minnesota Duluth’s Natural Resources Research Institute shows that the water-laden pits of abandoned mines have the potential to store wind energy by a pumped-hydro storage process which would use excess late-night wind ...

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... muscovite shows intense folding and transposition of older foliation observed by rarely preserved isoclinal fold hinges (Fig. 5b). Based on the observed mineral assemblage and recrystallization features of the main rock-forming minerals, we estimate that the primary metamorphic event that affected ...
    ... segments, here we separate the Serbo- Macedonian Unit into three sub-units: Northern (affected by the Pannonian Basin extension), Central (unaffected by signi- ficant Cenozoic extension) and Southern (affected by the Aegean extension). The Northern Serbo-Macedonian Subunit can be traced from its northernmost ...
    ... 2012). The western part of the mountains is predominantly made up by the Serbo-Macedonian biotite–muscovite gneisses and micaschists with intercalations of quartzites, amphibo- lites, and marbles, intruded in the north-west by a Paleozoic age granitic body (Fig. 3). Towards the east these show gra- ...

  • Classification of Terms on a Positive-Negative Feelings Polarity Scale Based on Emoticons

    Mihailo Škorić (2017)
    The goal of this paper is to draw attention to the possibility of using emoticon-riddled text on the web in language-neutral sentiment analysis. It introduces several innovations in the existing framework of research and tests their effectiveness. It also presents a software tool especially made for that purpose, explains how it builds a database with sentimental value of terms and offers the user manual. Finally, it presents a software tool that tests the new database and gives some examples ...
    data mining, information extraction, emotions, text on the web
    ... and their values, using software tool specifically made for this experiment. – testing values of the terms from the database by comparing them with human assessments and by using the software testing tool that is specif- ically designed for databases that are the product of the first part of the experiment ...
    ... together in one place. The values are calculated by taking into account the proximity of the determiners to the observed term and the value of those determiners. The determiners can be either emoticons or phrases that appear in the conversation, which by nature are not of universal meaning and reflect ...
    ... assign 80 Infotheca Vol. 17, No. 1, 2017 Scientific paper a certain value to emph unlabeled messages, he can do it by checking dodeli vrednost neobeleženim rečenicama button and by filling respective text box with value between −1 and 1 (figure 7). Figure 8. The appearance of the document segment ...

  • 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 ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... existing municipal waste landfill „Prelici“ used by the city of Cacak (Serbia). The existing landfill has existed as a dump since 1973, and then it has been placed out of the city area. However, by the urbanization of the city and especially by the expansion of the industrial zone, landfill has ...
    ... solid waste (MSW), is separated into material of old municipal waste (MSW-kO), which was created by the former active waste disposal on the whole southern part of the site and into material made by remediation measures of this landfill area, i. e. its covering of inert material (MSW-prk). Both of ...
    ... cisapublisher.com machinery. In the bottom part, the waste is saturated with liquid waste materials and eulath (caused by the infiltration of the flowing waters in the terrain), as well as by the occasional rise in the groundwater level. Figure 3. Characteristic geotechnical cross sections of the ...

  • Evidence for Badenian marine transgression in Belgrade (Serbia)

    Filip Anđelković, Dejan Radivojević (2019)
    ... further represented by a thick layer of sands and sandstones, showing a near-shore environment. This sandy level is overlain by subreefal limestones of “Leitha type”, which indicate a slightly deeper depositional environment. All of these palaeogeographical changes were enabled by the general connection ...
    ... stage. Belgrade is located on the southern rim of the Pannonian Basin (Marović et al, 2007). Badenian sediments in the Belgrade area are represented by four facies: Rakovica clastics, Tašmajdan limestones, Višnjica clays and Konjarnik schlier (Anđelković M., 1987; Anđelković, M.&Anđelković, J., 1997; ...
    ... sandstones) and limestones (mostly subreefal) have the greatest extent and palaeogeographic significance. The onset of transgression is well-marked by the occurrence of typical basal conglomerates at several locations in the city area, especially at Kalemegdan fortress and Rakovica stream. These ...

  • Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    kvalitet podzemnih voda, arsen, analiza rizika, Panonski Basen
    ... resulting from drinking raw groundwater contaminated by As in the South Pannonian Basin. Keywords: groundwater quality, arsenic, risk assessment, South Pannonian Basin *e-mail: ppapic@rgf.bg.ac.rs (10 μg/L). About 500,000 consumers are affected by drink- ing water containing As above this limit [7] ...
    ... Basin is a continental lowland surround- ed by mountains. It extends over a length of some 600 km in an west-east direction, from the eastern edges of the Alps in Austria and Slovenia to the Carpathian Mountains in Romania. In the south, the basin is bordered by the North Dinarides in Croatia, Bosnia and ...
    ... and Herzegovina, and Serbia, and in the north by the Tatras in Slovakia. The Danube River is also the western boundary toward Croatia, while to the north and northeast the South Pannonian Basin (Vojvodina) is bordered by Serbia’s state frontiers with Hungary and Romania. The surface area of Vojvodina ...

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • Hydrochemistry of groundwater contaminated by petroleum hydrocarbons: the impact of biodegradation (Vitanovac, Serbia)

    Nenad Marić, Jana Štrbački, Sanja Mrazovac Kurilić, Vladimir P. Beškoski, Zoran Nikić, Snežana Ignjatović, Jovana Malbašić (2020)
    Aquifer contamination by petroleum hydrocarbons leads to measurable changes of groundwater hydrochemistry, primarily due to the microbiological activity. This study analyzes this phenomenon at an historical kerosene-contaminated site in Vitanovac (central Serbia). Due to the long-term hydrocarbon contamination and exposure to aerobic and anaerobic biodegradation mechanisms, the lowest concentrations of O2, NO3−, and SO42− (electron acceptors) and the highest concentrations of Mn and Fe (products of microbial metabolic activity) overlap. The terminal redox-accepting processes in groundwater ranged from oxygen ...
    podzemne vode, hidrohemija, zagađenje, naftni ugljovodonici, biodegradacija

  • How active is recent tectonics in the central Balkans: Evidence from the Serbian Carpatho-Balkanides

    Ana Mladenović (2022)
    Since the Late Cretaceous, after closure of the Neotethys ocean, tectonic processes in the central Balkan Peninsula were mainly controlled by the mutual interaction of the Adriatic and the Eurasian plates, and tectonic units in-between. Most of the tectonic structures that have been active during Cenozoic times were inherited from previous tectonic stages under different tectonic regimes. Tectonic activity within the Carpatho-Balkan orogen in eastern Serbia since Miocene is conditioned by the existence of the rigid Moesian promontory east ...

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... all samples, n-alkanes prevail, followed by hopanoids and diterpenoids, while steroids, non-hopanoid triterpenoids, fernenes, sesquiterpenoids, and isoprenoids are present in low concentrations. An exception is Middle Miocene sample, which is characterized by a higher abundance of hopanoids than n-alkanes ...
    ... and non-hopanoid triterpenoids implies that diagenetic aromatization of the OM was governed by bacterial activity, rather than thermal alteration. The exception is middle Miocene sample that characterizes by notably higher degree of terpenoids’ aromatization associated with distinctively elevated ...
    ... lignites are characterized by more pronounced variations of biomarker signatures than Lower Miocene samples, most probably due to the more pronounced fluctuation of water-level and/or palaeo-wildfires. The main differences between Middle and Lower Miocene coals are expressed by higher dehydroicetexane ...

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving