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Упит dcterms_subject_txt:kinetic study

708 items

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia

    Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić (2023)
    Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive industry and the local community. On the example of the "Valjevo" B-Li deposit, data on structural settings and previous hydrogeological investigations were combined with the results of resource drilling and geophysical ...
    Geothermal assessment, Mineral deposit exploration, Geothermal potential, Serbia
    ... results of resource drilling and geophysical survey to assess the geothermal potential of the basement of the Valjevo-Mionica Neogene basin. The study estimated the basin's depth and expected temperatures ranging from 40"C to 65"%C for the Triassic limestone reservoir. The applied approach enabled ...
    ... significantly to the estimation and utilization of the geothermal resources of the wider area [3-5]. In relation to the aforementioned research, this study provides a more detailed estimation of the geothermal potential supported by new data collected on exploring the "Valjevo" deposit. The emphasis was ...
    ... remains about the hydraulic properties and storativity of the limestone aquifer in the basement of the Miocene basin. 2. GENERAL SETTINGS 2.1. Study area The presented research is focused on the western part of the "Valjevo-Mionica" Miocene age basin (Figure 1). The "Valjevo" deposit is situated ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... Micro- to nano-scale textures of ore minerals: methods of study and significance, grant number BI-RS/18-19-035, project J2-4440 and program P1-0417. Crystals 2023, 13, 278 10of11 Data Availability Statement: The data presented in this study are available on request from the corresponding, authors ...
    ... ; Slattery, A.; Basak, A. Nanoscale Study of Clausthalite-Bearing, Symplectites in Cu-Au-(U) Ores: Implications for Ore Genesis. Minerals 2018, 8, 67. [CrossRef] Ding, Y.; Veblen, D.R.; Prewitt, C.T. High-Resolution Transmission Electron Microscopy (HRTEM) Study of the 4a and 6a Superstructure of ...
    ... during several field excursions. From this sample collection curated at the Faculty of Mining, and Geologyy in Belgrade, for the purposes of this study, Crystals 2023, 13, 278 3of11 14 samples from 7 localities of different types of mineralisation (Figure 1a,b) were selected, in which arsenopyrite ...

  • 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
    ... schema based on API Compendium methodology is presented in Figure 1. III MODEL – CASE STUDY For thc purposc of presenting the mentioned approach in monitoring and calculation of GHG, a realistic case study of an onshore upstrecam O&G 3company is crcated. Within this company, three major emitters ...
    ... generated by cach cntity in a rcalistic way, allowing us to access the total direct (Scope 1) GHG emissions produced by the company. Analysis of the case study results in an integrative manncr, gives a better understanding of thc environmental impact of the O&G industry, and identifies opportunities for ...
    ... 75000 ! 74930 ! 2020 ! 12000 1100 | - cO - Offices ! 2021 ! 10000 13000 ! - cO - ! 2022 ! 9000 15000 ! - cO - Taking this into account, the case study presented in this paper will assume a single gas composition mcasurement available for Flowstation and Gas Plant facilities (Table 3). This resembles ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... Preliminary organic ge-ochemical study of lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia)–Reconstruction of geological evolution and potential for rational utilization. J. Serb. Chem. Soc. 2015, 80, 575–588. [CrossRef] 46. Khedri, S.; Elyasi, S. Kinetic analysis for thermal cracking ...
    ... Press: Cambridge, UK, 2005; pp. 72–81. 27. Behar, F.; Kressmann, S.; Rudkiewicz, J.; Vandenbroucke, M. Experimental simulation in a confined system and kinetic modelling of kerogen and oil cracking. Org. Geochem. 1992, 19, 173–189. [CrossRef] 28. Shao, X.; Pang, X.; Li, M.; Qian, M.; Hu, T.; Li, Z.; Zhang ...
    ... organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia). Int. J. Coal Geol. 2018, 195, 139–171. [CrossRef] 3. Mitrović, D.; Ðoković, N.; Životić, D.; Bechtel, A.; Šajnović, A.; Stojanović, K. Petrographical and organic geochemical study of the Kovin lignite ...

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... used in this study is shown in Figure 6.9. Specialist Standard cards „ S 5 5 B B B E B B B E B B E E -f. „O F Store cards V I V I I I I I ) Card visualization Label cards Discard cards Figure 6.9. Classification and manual selection schema for well logs used in this study After cla ...
    ... s, and visualized. After manual classification of the logs in this study, the number of logs was obtained according to operational conditions or sensor errors. Table 1 shows the distribution of logs by type used in this study. 57 Type of Operation Modes and Automation Fails Number of Cards ...
    ... conditions are monitored using dynamometric cards from depth, which are analyzed visually, a process that can be labor-intensive and impractical.This study investigates. how machine learning can enhance diagnostics in these systems. Researchers conducted 60 tests using over 50,000 dynamometric cards ...

  • Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example

    Miloš Marjanović, Biljana Abolmasov, Igor Peshevski, James Reeves, Irena Georgievska (2020)

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе
    ... Environm [10] Guzzetti F, Carrara A, Cardinalli M, Reichenbach P. (1999). Lan evaluation: a review of current techniques and their application in a m study, Central Italy. Geomorphology 31:181�216. [11] Crozier M. & Glade T. (2005). Landslide hazard and risk:Issues, Approach. In: Glade T., Anderson M ...
    ... Geology and the Environ Guzzetti F, Carrara A, Cardinalli M, Reichenbach P. (1999). Lal evaluation: a review of current techniques and their applicatior study, Central Italy. Geomorphology 31:181 216. Crozier M. & Glade T. (2005). Landslide hazard and risk:Issues, Approach. In: Glade T., Anderson M. & Crozier ...
    ... ������ � ������� �������� �� ������ �� ›��� �� �������� ������� ������. �������� 7�10: 239�246. [19] Abolmasov B. (2016). Landslide Risk Management Study in Bosnia and H UNDP Bosnia and Herzegovina, Sarajevo, BiH. pp 82. http://www.ba.un [20] Andrejev K., Kru�i� J., ¶uri� U., Marjanovi� M., Abolmasov ...

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... material and methods Beside a lot of outcrops of the ophiolitic mćlange south of the study area the outcrops between Rožanstvo and Trnava near Ilidža (Fig. 2) provide the rather rare possibility to study components from the ophiolitic mćlange which occur in fissures of underlying limestone ...
    ... + ophiolites + + B oceanic crusUoophiolites position of the study area c Callovian/Early Oxfordian ongoing westward directed (~163-160 Ma) ophiolite obduction ? « -o —oC—o— J iddle - position of the P Micdle - Late study area' future DOB TIII "plagiogranites" formation of SSZ BBB ...
    ... points to a deposition of the radiolarites on top ofthe oceanic crust of the Neo-Tethys, which started to open in the Late Anisian. South of the study arca the ophiolitic mćlange (Gostilje-Ljubiš-Visoka-Radoševo mćlange) contains a mixture of blocks of 1) oceanic crust, 2) Middle and Upper "Triassic ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... lexical resources: A case study for Serbian Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Indexing of textual databases based on lexical resources: A case study for Serbian | Ranka Stanković ...
    ... employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Indexing of textual databases based on lexical resources: A case study for Serbian Ranka Stanković1, Cvetana Krstev2, Ivan Obradović1, and Olivera Kitanović1 1 University of Belgrade, Faculty of Mining and Geology ...
    ... University Press (2008) 9. Martinović, M.: Transfer of Natural Language Processing Technology: Experi- ments, Possibilities and Limitations Case Study: English to Serbian. INFOtheca 9(1–2), 11a–21a (May 2008) 10. Maurel, D., Friburger, N., Antoine, J.Y., Eshkol, I., Nouvel, D., et al.: Cascades de ...

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Stratigraphy and microfossils (radiolarians and planktonic foraminifers) of the Upper Cretaceous (upper Santonian–lower Campanian) Struganik limestone (Western Serbia)

    Liubov G. Bragina, Nikita Yu. Bragin, Ludmila F. Kopayevich, Nevenka Đerić, Nataša Gerzina Spajić (2019)
    Paleontology, Stratigraphy, Ecology, Evolution, Behavior and Systematics

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • The Early Middle Palaeolithic in the Balkans. The case of Velika and Mala Balanica (Serbia)

    Mihailović, D., Belen Marín-Arroyo, A., Bogićević Katarina, Morley, M. & Roksandić, M. (2011)

  • Results of comprehensive monitoring activities on Umka landslide, Belgrade, Serbia

    Biljana Abolmasov, Uroš Đurić (2021)
    klizišta, monitoring
    ... Sentinel1 radar satellite images, conventional geodetic monitoring network data and UAV imaging, processing and data analysis in the last six years. Study area The Umka landslide is formed on the right Sava river bank, 22 km southwest from Belgrade, and occupies part of Belgrade suburban settlement ...
    ... Milenković S., Jelisavac B., Vujanić V., Pejić M. and Pejović M., 2012, Using GNSS sensors in real time monitoring of slow moving landslides-a case study. Proceedings of the 11th International and 2nd American Symposium on Landslides and Engineered Slopes, Banff, Canada, 3-8 June, 2012, Eds. Eberhardt ...