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Упит dcterms_subject_txt:mechanical extraction methods,

567 items

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... nt of Lignite Open cast Technology in Order to Increase Energy Efficiency and Occupational Safety” (TR 33039), “Developed new methods for diagnosis and examination mechanical structures” (TR 35040) and a part of the project “Research on possibility for AT (Advanced Technology) rockbolting application ...
    ... according to recommended method for evaluation of hourly ownership and operational costs, including data on auxiliary machines (Caterpillar and Komatsu methods). Integration of this information with operational conditions will enable reliable evaluation. Total costs, i.e. specific cost per moto hour is the ...

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

    Biljana Abolmasov, Uroš Đurić (2021)
    klizišta, monitoring
    ... with the Sava river level rise/drawdown, respectively, whereas landslide velocity is characterized as slow to very slow (Abolmasov et al. 2015). Methods In the past decades many authors integrated monitoring data from different sources to reduce uncertainities. Monitoring activities are composed ...

  • Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia

    Maja Milošević, Bojan Kostić (2022)
    ... iron oxy/hydroxides, respectively. The clay from Svrljig (Serbia) was characterized by chemical, mineralogical and thermal analysis. All applied methods were in good agreement indicating that the studied clay has a high content of montmoril- lonite and a smaller amount of quartz, carbonates, iron o ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... performs on these objects during field research are: Measurement of groundwater level The Center for Karst Hydrogeology is equipped with both mechanical groundwater level meters up to 50 m and 100 m deep, as well as digital data loggers (diver), compact groundwater monitoring instrument for the ...
    ... pumps with the ability to sample water up to 60 m from wells with a diameter of only 50 mm. In addition to these pumps, the CKH also has several mechanical samplers that are used for frequent sampling from exploratory wells and from certain depths, mainly for the purposes of tracer tests or taking ...
    ... equipment that was completely designed and made by the members of the CKH, for the purpose of removing obstacles from wells. It is a pneumatic-mechanical gripper for underwater work in wells, boreholes, reservoirs up to a depth of 100- 15 CKH fluolampa, zaštitna odela, etaloni i ostala prateća ...

  • Development of a petrographic classification system for organic particles affected by self-heating in coal waste. (An ICCP Classification System, Self-heating Working Group – Commission III)

    M. Misz-Kennan, J. Kus, D. Flores, C. Avila, Z. Büçkün, N. Choudhury, K. Christanis, J.P. Joubert, S. Kalaitzidis, A.I. Karayigit, M. Malecha, M. Marques, P. Martizzi, J.M.K. O'Keefe, W. Pickel, G. Predeanu, S. Pusz, J. Ribeiro, S. Rodrigues, A.K. Singh, I. Suárez-Ruiz, I. Sýkorová, N.J. Wagner, D. Životić (2020)
    Self-heating of coal waste is a major problem in the leading coal-producing and consuming countries, independent of the recent or past coal exploitation history. The phenomenon of self-heating is dependent on many factors such as the properties of organic matter (maceral composition and rank), moisture and pyrite content, climate effects, and storage conditions (shape of the dump or compaction of the coal waste). Once deposited, coal waste undergoes oxidation, which can lead to self- heating with the overall temperatures ...
    Stratigraphy,Economic Geology,Geology,Fuel Technology

  • 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
    ... check the correctness of every lemma with the function ‘Inflect’ that lists all inflected forms of a selected lemma. Another useful function is the extraction of subsets of lemmas based on different criteria: lemmas’ beginning, their part of 2http://hlt.rgf.bg.ac.rs/VebRana Fig. 4. The DELAC entry ...
    ... to point out another interesting aspect of MWUs which can be exploited in the processing of named entities, as the initial phase in information extraction. Serbian morphological dictionaries and local grammars are successfully being used for recognition of names of persons and of various functions ...

  • The correlation of Upper Miocene lithostratigraphic units of the southern part of the Pannonian basin

    Filip Anđelković, Dejan Radivojević (2019)
    gornji miocen, litostratigrafske jedinice, formacije, Panonski basen
    ... formations and members and are characterized by their lithological concent, depositional environments, using field and borehole data, and geophysical methods (reflection seismics and geophysical well-logging). Such correlation has great significance for the knowledge of the Pannonian Basin System. Besides ...

  • Comparative analysis of correlation coefficients in mineralogical and geophysical data from the mine tailing site “Rudnik” (Serbia)

    Vesna Cvetkov, Filip Arnaut, Dragana Životić (2024)

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... [10]. On top of the base layer, which is displayed using OpenStreet maps two additional layers are shown: polygons singled out by remote sensing methods and polygons resulting from the analysis of exploitation authorizations, requests for reclamation and site visits. The left side of the web page ...
    ... Analytic Hierarchy Process The Analytic Hierarchy Process (AHP) method used within this project is considered to be one of the most commonly used methods for multi-criteria decision making. The method of analytical hierarchy process is commonly used in the analysis of decision-making as well as in ...
    ... qualified and reliable advisor while pondering the alternatives and determining their effects in relation to the goals set. Application of AHP methods in environmental protection system modelling provides for ranking of work activities, statuses, environmental and other factors taking into account ...

  • Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases

    Nikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić (2021)
    Ispitivani su uticaji primene mono- i dvokomponentnih organskih modifikatora na određivanje lipofilnosti 12 tetradentatnih Šifovih baza metodom reverzno-fazne tankoslojne hromatografije. Osnovni cilj je da se proceni tip interakcije između posmatranih jedinjenja i komponenti primenjenih hromatografskih sistema i uspostavi neki obrazac ponašanja kako bi se lakše izabrala kombinacija organskih modifikatora koji će simulirati interakciju u biološkim sistemima na osnovu činjenica da iste osnovne intermolekularne interakcije su odgovorne za ponašanje supstanci i u biološkom i u hromatografskom sistemu. Primenjeni organski modifikator ...
    Šifove baze, Lipofilnost, RP-TLC, Organski modifikatori

  • 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
    ... reviewed and analyzed and conclusions were made related to the genesis of the karst groundwater and its circulation conditions. 2. Materials and Methods The Krupaja system represents one of the most complex karst systems within the Beljanica karst massif, and as such, it is of greatimportance for ...
    ... ac-2 (eastern Serbia). Carbonates Evaporites 2020, 35, 16. [CrossRef] 4. eannin, P.Y.; Groves, C.; Hauselmann, P. Speleological Investigations, Methods in Karst Hydrogeology; LAH Book Series; Taylor & Francis: London, UK, 2007. 5. ovacs, A. Geometry and Hydraulic Parameters of Karst Aquifers: A ...
    ... [PubMed] Vasić, L.; Živojinović, D.; Rajaković-Ognjanović, V. Hydrochemical changes and groundwater grouping, data by multivariate statistical methods within one karst system: Recharge-discharge zone (Eastern Serbia case study). Carbonates Evaporites 2020, 35, 15. [CrossRef] Disclaimer/Publisher's ...

  • Effects of Energy Production and Consumption on Air Pollution in Serbia

    Marija Živković (2019)
    Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...
    energy related emissions, Serbia
    ... Dl Chapter 5: Mexico > Bl chapter 6 European CG CES ono > Bl Chapter 7: china Combustion of — Fuel combustion, — Exhaust, brake Cooking, heating Extraction, storage, Agriculture, > Bl chapter sna coal ol.gas, process andtyreand——andiighting—transportand.” solvents and Doenergy’ emissions Toad wea, t ...

  • Analiza uporednog praćenja temperature površine ohlađenih materijala pri njihovom zagrevanju do ambijentalne temperature

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Katarina Nestorović (2021)
    U datom eksperimentalnom radu su termografskim metodama ispitivane termofizičke karakteristike različitih materijala. Za ispitivanja su izabrani mesingani niovčić, ugalj i pelet, jer imaju različita termoizolaciona svojstava i različito stanje površine. Uzorci su najpre hlađeni, a zatim je njihovo zagrevanje na sobnoj temperaturi praćeno termalnom kamerom. U drugom delu eksperimenta, korišćena je impulsna termografija, a zagrevanje površine uzoraka vršeno je svetlosnom pobudom.
    termografija, impulsna termografija, nedestruktivno testiranje materijala, mesing, ugalj, pelet

  • XRD dertermination od hydrothermal phases related to epithermal mineralization in the Čukaru Peki deposit

    Dragana Bosić, Vladica Cvetković, Miodrag Banješević, Kristina Šarić (2024)
    Čukaru Peki, epithermal mineralization, hydrothermal alterations

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... Mb1–Mb4 with 3 additional utility modules Mu1–Mu3 for reception, changing rooms, office, examination room and café, and an unheated module Mt1 as the mechanical room. Stage 2 (Figure 8b) is conceived as an expansion of Stage 1 with 2 added balneotherapy units Mb5–Mb6, an additional utility module Mu4 and ...
    ... only during the summer. In both cases, special attention is dedicated to passive measures for thermal comfort during the summer, thereby minimizing mechanical ventilation and air conditioning while addressing the well-being of users, in addition to enhancing hygiene standards, new occupancy protocols and ...
    ... Economic Investigation. Appl. Sci. 2020, 10, 6639. [CrossRef] 2. Ilzarbe, J.M.B.; Malpartida, J.G.; Chandro, E.R. Recent Patents on Geothermal Power Extraction Devices. Recent Patents Eng. 2013, 7, 2–24. [CrossRef] 3. IRENA (International Renewable Energy Agency). Available online: https://www.irena.or ...

  • 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) ...
    ... classification problem with classes of ironic and non-ironic statements. In the paper [27] comparison 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 ...
    ... balanced and imbalanced set of tweets, respectively). Findings re- ported in [3] depict binary classification of tweets using Random Forest (RF) and DT methods, where the best result (F1 = 80%) was achieved using the RF method over the corpus of #humor tweets, while authors in [6] used Support Vector Machine ...
    ... (LR), DT, RF and NB, and the best result (F1 = 74%) was achieved using the LR method with a combination of all sug- gested predictors. Pattern-based methods of irony detection utilize patterns either independent of or specific to a particular natural language that is being investigated. For example, authors ...

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... estimator, but it is not adequate to predict the uncer- tainty of a process. According to [9], on contrary to kriging, geostatistical simulation methods aim to reproduce in situ variability, and the spatial continuity of the input data set. Models used in this way, aim to replicate the spatial structure ...
    ... common planning objective is maximization of tonnage, while meeting the requirements of physical and geological constraints, policies and mining methods. The basic data required in any operational planning are coal quality and capacity. Difficulties in optimum production schedule are caused by variability ...
    ... First, the coal quality requirements for a planning period must be met, subject to some physical and geological constraints, policies and mining methods. Secondly, the quantity re- quirements must ensure sufficient coal produc- tion. This model, in general, is based on predicted information about ...

  • A Tel Platform Blending Academic And Entrepreneurial Knowledge

    Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović (2013)
    ... pace with new advancements in academic knowledge. BAEKTEL accessibility services are supposed to support formal learning description methods, as well as methods for describing cognitive student and teacher workload in TEL. Providing means for easy integration of learning content from different ...

  • An oilfield in Libya: A new model to enhance waste water disposal

    Dušan Danilović, Vesna Karović Maričić, Nori Elhaddad, Branko Leković (2016)
    нафта, лежишне воде, припрема

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling