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Упит dcterms_subject_txt:rock breakage by explosives

1106 items

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (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 ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... 2014, 41, 8157–8164. [CrossRef] © 2020 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/). ...
    ... for modeling different processes dominated by uncertainty, multidimensionality, subjectivity and indeterminacy. Optimization criteria were taken into account during model development in order to achieve an optimal selection of artificial lift methods by fuzzy logic application. Optimization criteria ...
    ... Khesht Field. Pet. Sci. Technol. 2014, 32, 1791–1799. [CrossRef] 2. Ghiasi-Freez, J.; Ziaii, M.; Kadkhodaie-Ilkhchi, A.; Honarmand, J. A Reservoir Rock Porosity Estimation through Image Analysis and Fuzzy Logic Techniques. Energy Sources Part A Recovery Util. Environ. Eff. 2014, 36, 1276–1284. [CrossRef] ...

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... affiliations. Copyright: © 2021 by the authors. Li- censee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and con- ditions of the Creative Commons At- tribution (CC BY) license (http://crea- tivecommons.org/licenses/by/4.0/). Energies 2021, 14, ...
    ... turbines. This is particularly supported by the fact that at present, in virtually every country and even in certain administrative units within a given country, there are different normative and legal acts regarding the limitations of acoustic noise emitted by wind turbines. The wind farm noise ...
    ... m and the rotor diameter at 162 m (Vestas V 162/5,6 MW); 3. The permissible noise levels of wind turbines recommended by the World Bank were compared with the values permitted by national regulations [56]; 4. The basic values used in this report to describe noise are in accordance with the conventions ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • Geochemical study of U, Th and REE mineralizations in Jurassic sediments and hydrochemical characterization of groundwaters in Eastern Serbia – Case study: Plavna area

    Jovan Kovačević, Maja Todorović, Marina Ćuk, Petar Papić (2016)
    jurski sedimenti, uran, torijum, elementi retkih zemalja, podzemna voda, istočna Srbija

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... Mineralogical soil sample composition was determined by X-ray diffraction method (Rigaku SmartLab, X-ray diffractometer) under the conditions provided in Table I. The humus content has been determined by volumetric method15 and the clay content by hydrometric method.16 Sorption capacity for all three ...
    ... glasses by rinsing with 40 mL of 0.02 mol L-1 nitric acid and 60 mL bidistilled water. Phase IV: in each glass with suspension from Phase III, 10 mL of 30 % hydrogen peroxide was added, which was acidified by concentrated nitric acid up to pH 2. The control test was represented only by the acid ...
    ... from calculating the difference of what was introduced and what remained in the solutions. The soils had previously been digested by microwave digestion20 and analyzed by ICP-OES for verification and assurance that lanthanum and neodymium were not present in the soil. These elements were below the detection ...

  • Keyword-Based Search on Bilingual Digital Libraries

    Ranka Stanković, Cvetana Krstev, Duško Vitas, Nikola Vulović, Olivera Kitanović (2017)
    This paper outlines the main features of Biblisha, a tool that offers various possibilities of enhancing queries submitted to large collections of aligned parallel text residing in bilingual digital library. Biblishsa supports keyword queries as an intuitive way of specifying information needs. The keyword queries initiated, in Serbian or English, can be expanded, both semantically, morphologically and in other language, using different supporting monolingual and bilingual resources. Terminological and lexical resources are of various types, such as wordnets, electronic ...

  • Terminological and lexical resources used to provide open multilingual educational resources

    Biljana Lazić, Danica Seničić, Aleksandra Tomašević, Bojan Zlatić (2016)
    Open educational resources (OER) within BAEKTEL (Blending Academic and Entrepreneurial Knowledge in Technology enhanced learning) network will be available in different languages, mostly in the languages of Western Balkans, Russian and English. University of Belgrade (UB) hosts a central repository based on: BAEKTEL Metadata Portal (BMP), terminological web application for management, browse and search of terminological resources, web services for linguistic support (query expansion, information retrieval, OER indexing, etc.), annotation of selected resources and OER repository on local edX ...
    otvoreni obrazovni resursi, leksički resursi, obrada prirodnih jezika, terminologija
    ... synonymous words representing a concept, with basic semantic relations between them forming a semantic network. Each synset word is denoted by a “literal string” followed by a “sense tag” which represents the specific sense of the literal string in that synset. Interlingual index (ILI) enables the connection ...
    ... incredibly laborious and time- consuming task. Traditionally, this kind of undertaking would be done by a terminologist who would list potential term candidates to include in the ontology and would then proceed by consulting a domain expert to arrive at a final list of validated terms [13]. Other problem ...
    ... education where one involves e-learning and computer-assisted learning and instruction and the other consists of NLP tools for analysis and use of language by machines [1]. The usage and application of the research done in the field of the NLP has been present in the domain of education from the 1960s. ...

  • Business Models for Small-scale Biomass Projects Development

    Dejan Ivezić, Miodrag Gluščević, Marija Živković (2019)
    Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...
    ... model implementation, the project of replacement of existing boiler in local school by woodchips boiler has all desirable characteristics. Current energy consumption is too high and significant reduction is possible by implementation of energy efficiency measures. Fuel shift, from coal to woodchips, would ...
    ... the municipality budget and managing of the plant by the local public utility company. This business model is not very attractive for the motivation of local people to connect or reconnect to the DH network. The price of distributed heat is determined by PUC, and biomass supply from local sources is not ...
    ... agreement No 691661. References [1] Ministry of Mining and Energy, Energy Sector Development Strategy of the Republic of Serbia for the period by 2025 with projections by 2030, Official Gazette of the Republic of Serbia, 101/2015, 2015. [2] Statistical Office of the Republic of Serbia, Energy Balances, 2017 ...

  • Characterization of bituminite in Kimmeridge Clay by confocal laser scanning and atomic force microscopy

    Paul C. Hackley, Jolanta Kus, João Graciano Mendonça Filho, Andrew D. Czaja, Angeles G. Borrego, Dragana Životić, Brett J. Valentine, Javin J. Hatcheries (2022)
    This work investigates bituminite (amorphous sedimentary organic matter) in Upper Jurassic Kimmeridge Clay source rock via confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). These petrographic tools were used to provide better understanding of the nature of bituminite, which has been historically difficult to identify and differentiate from similar organic matter types in source rocks. As part of an International Committee for Coal and Organic Petrology (ICCP) working group, an immature (0.42% vitrinite reflectance), organic-rich (44.1 wt% ...
    Битуминит, Kонфокална ласерска скенирајућа микроскопија, Mикроскопија атомских сила, Органска петрологија, Термичка зрелост

  • Photocatalytic Activity of the V2O5 Catalyst toward Selected Pharmaceuticals and Their Mixture: Influence of the Molecular Structure on the Efficiency of the Process

    Sanja J. Armaković, Aleksandra Jovanoski Kostić, Andrijana Bilić, Maria M. Savanović, Nataša Tomić, Aleksandar Kremenović, Maja Šćepanović, Mirjana Grujić-Brojčin, Jovana Ćirković, Stevan Armaković (2023)
    Due to the inability of conventional wastewater treatment procedures to remove organic pharmaceutical pollutants, active pharmaceutical components remain in wastewater and even reach tap water. In terms of pharmaceutical pollutants, the scientific community focuses on -blockers due to their extensive (over)usage and moderately high solubility. In this study, the photocatalytic activity of V2O5 was investigated through the degradation of nadolol (NAD), pindolol (PIN), metoprolol (MET), and their mixture under ultraviolet (UV) irradiation in water. For the preparation of V2O5, facile ...
    DFT analysis, metoprolol, nadolol, nanomaterial characterization, photocatalysis, pindolol, β-blocker
    ... January 2023 Copyright: & 2023 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 (https:/ / creativecommons.org//licenses/by/ 4.0/). 4 University of Novi ...
    ... e Cao.sPbo.s-xYbxZnyFeiy.yO u synthesized by sol-gel autocombustion method [15], the CaNax / AgSOy Co y „Biy.yOz synthesized by the combination of sol-gel and annealing; approaches [14], porous methacrylic organosilica materials (AgPMOS) synthesized by reducing the silver moieties on and in the ...
    ... including the empirically derived correction (D3 variant) developed by Prof. Stefan Grimme and coworkers [73—77]. Additionally, we included the Hubbard U correction for vanadium atoms to consider the underestimation of the band gap by the DFT approach [78]. In this case, we set the U value for vanadium ...

  • 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
    ... Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by- nc-nd/4.0/). https://doi.org/10.1016/j.egyr.2021.02.072 http://www.elsevier.com/locate/egyr http://www.elsevier.com/locate/egyr http://creativecommons.org/licenses/by-nc-nd/4 ...
    ... highest potential among available renewable energy sources. © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 1. Introduction Keeping the global temperature rise below 2 degrees Celsius requires ...
    ... 4.0/ mailto:boban.pavlovic@rgf.bg.ac.rs https://doi.org/10.1016/j.egyr.2021.02.072 http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ B. Pavlović, D. Ivezić and M. Živković Energy Reports xxx (xxxx) xxx Table 1 Total installed capacity for electricity ...

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

  • Using Lexical Resources for Irony and Sarcasm Classification

    Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković (2017)
    The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...
    ... of Naive Bayes (NB) and Decision Trees (DT) methods used to classify tweets into ironic and non-ironic, showed that the results achieved by DT method measured by the F1 measure were better (71.5% and 53.3% for the balanced and imbalanced set of tweets, respectively). Findings re- ported in [3] depict ...
    ... getting a word from the e-dictionaries. This approach is illustrated by the following example (incorrectly written words are underlined): Before correction: Tim koji trenira Sasa Djordjevic ne moze da pogodi za tri poena! (The team trained by Sasa Djordjevic cannot score for three points!) After correction: ...
    ... tweets using a set obtained in the above described way was performed by two linguistic experts (step 3, Fig 1). Keeping in mind the fact that we used query that searched Twitter with geolocation and time con- straints and not by a language constraint, this set could also contain tweets that do not belong ...

  • An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction

    Dejan Ćebić, Nebojša Ralević, Marina Marčeta (2020)
    нелинеарна једначина, 16.ред конвергенције, оптималне методе, подељене разлике

  • Concepts for Improving Machine Learning Based Landslide Assessment

    Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić (2019)
    Katastar klizišta, Podložnost, Hazard, Mašinsko učenje, Uzorkovanje, Validacija

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides

    Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)
    analogno modelovanje, raspodela deformacija, geometrija indentera, Černa i Timok rasedni sistem
    ... 2018. Refining the thermal structure of the European lithosphere by inversion of subsurface temperature data. Global Planet. Change 171, 18–47. Lister, G.S., Williams, P.F., 1983. The partitioning of deformation in flowing rock masses. Tectonophysics 92, 1–33. Lodolo, E., Menichetti, M., Bartole ...
    ... Journal of Structural Geology 149 (2021) 104386 0191-8141/© 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Analogue modelling of strain partitioning along a curved strike-slip fault system during ...
    ... arc connects the South Carpathians, the Serbian Carpathians and the Balkanides by creating an orocline with a back-arc convex geometry bent around the Moesian Platform (Fig. 1a and b). The oroclinal bending formed by gradual clockwise rotation and N- to E-ward translation of the Dacia mega-unit ...

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... reported by the pottery manufacturers, whicl h was confirmed by the analytical methods used. Based on the plasticity and grain size, we have con- firmed that the CIBd may be used in the manufacture of pottery, but its industrial applications are limited, although these could be enhanced by adjusting ...
    ... destroyed by blasting, is then easily removed from the bed due to its physical properties. Preparation of the clay body According to Djordjević (2013), after mixing of all of the types of raw clays present in the quarry (Milošević etf al, 2019a) and o The Author(s), 2020. Published by Cambridge ...
    ... rhombic shape of the calcite crystals is most common in the observed samples, validated by SEM/EDX analysis of the CC sample (Fig. 4). Calcite is mostly pure CaCO, with a minor Fe content and slight contamination by clay particles and quartz (Fig. 4). The DTA curves of the investigated samples show ...

  • Increasing the Local Road Network Resilience from Natural Hazards in Municipalities in Serbia

    Biljana Abolmasov, Miloš Marjanović, Ranka Stanković, Uroš Đurić, Nikola Vulović (2024)
    lokalni putevi, prirodni hazardi, otpornost na klimatske promene, MaPLoRds