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Упит dcterms_subject_txt:underground exploitation

217 items

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... resources and reserves are currently estimated at 275 Mt (MITROVIĆ et al., 2016). Subaque­ ous exploitation of lignite (below the Danube river) in the offshore zone of the “A” field, named “Experimental exploitation field” (EEF) began in 1991, and is still active. Since 1991, the Kovin mine has produced ...
    ... present the content and mode of occurrence of major and trace elements in coal from the Kovin deposit in order to assess their behaviour in case of exploitation for electric power generation. 2. GEOLOGICAL SETTINGS The area of the Kovin deposit consists of Palaeozoic schist, Ter­ tiary and Quaternary ...
    ... 2017.09.005 FOSCOLOS, A.E., GOODARZI, F., KOUKOUZAS, C.N. & HATZIYIANNIS, G. (1998): Assessment of environmental impact of coal exploration and exploitation in the Drama basin, northeastern Greek­Makedonia.– Energy Sources, 20, 795– 820. GENTZIS, T., GOODARZI, F., KOUKOUZAS, C. & FOSCOLOS, A. (1996): ...

  • Towards translation of educational resources using GIZA++

    Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević (2016)
    ... linguistics (QUALICO) in Belgrade, Serbia, April 26-29, 2012. University of Belgrade, 2013. [20] D. Vitas and C. Krstev. “Construction and Exploitation of X-Serbian Bitexts”. In Cristina Vertan and Walther v. Hahn (eds.) Multilingual Processing in Eastern and Southern EU Languages: Low-Resourced ...

  • 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

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... Academic Editor: Enrico Sciubba Received: 27 May 2016; Accepted: 3 November 2016; Published: 10 November 2016 Abstract: The technological process of exploitation of mineral resources and processing of mined ores to cater to the market results, among other things, in a large amount of tailings deposed on tailing ...
    ... (agriculture, water supply, urban areas, water flows, etc.). In general, all material left after the extraction of minerals or after the process of exploitation is waste, which when dumped on the deposit spot creates the tailing pond [2]. Vast areas are covered with mining tailings. For example, amounts ...

  • 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

  • Просторни положај лежишта угља Ђурђевик: геофизичко-геолошки модел

    Синиша Арсеновић (2019)
    Лежиште угља Ђурђевик представља источни део Бановићког угљеног басена и припада северној страни босанске офиолитске зоне унутрашњих Динарида у чији састав улазе стене палеозојске, мезозојске и кенозојске старости. Језерска доњомиоценска угљоносна серија изграђена је од лапоровито-глиновитих седимената са једним слојем мрког угља. Дебљина угљеног слоја креће се у интервалу од 5 до 25 m са генералним правцем пружања СЗ - ЈИ и падом према ЈЗ. У зони обухваћеноj геофизичким истраживањима изражена je пострудна тектоника у виду раседа мањег и ...
    рефлективна сеизмика, 3Д геофизичко-геолошки модел, угаљ, синтетички модел, моделирање
    ... 220-228. 100 Hatherly, P., Zhou, B., Peters, T., Urosevic, M., 2008. Acoustic impendance inversion for geothechnical evaluation in underground coal mining. SEG Tehcnical program expanded abstract, doi:10.1190/1.3064076. Hatherly, P., Zhou, B., Urosevic, M., Peters, T., 2013. Insights ...
    ... computer simulations of the wave response were carried out was based on the forecast geological profile and the data of the exploration and exploitation processes. The first model was made in high resolution, which was then degraded to the level at which it is possible to carry out the interpretation ...
    ... network so that, based on the interpretation of the 2D projection of the coal series in correlation with the available data of other exploration-exploitation works, it was possible to make a spatial interpretation as well as a reliable 3D model of the coal series. Keywords: reflective ...

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... stope is formed up to the level +710m, which means that the total depth of mine is 300m. In the nineteen seventies, the concept for the underground exploitation of this deposit was designed. In the course of this, the following capital objects were constructed: the adit Jadar with length of over ...
    ... solutions were conditioned by the spatial position and geometry of the open pit including appertaining structures, underground mine chambers constructed in the seventies within the underground production system at that time, as well as by spatial position and geometry of the bauxite deposit (Qiang et ...
    ... assessment of the spatial position of the point, it being the exit point to the existing bench of the open pit at the elevation +420m. keywords: underground mining, bauxite mine, mine surveying, a priori accu- racy assessment. Aleksandar Milutinovic Associate professor University of Belgrade Faculty ...

  • The state and perspective of the natural gas sector in Serbia

    Dejan Ivezić, Marija Živković, Dušan Danilović, Aleksandar Madžarević, Miloš Tanasijević (2016)
    The strategy of long-term energy development of Serbia identifies an increase of share of natural gas in final energy consumption as one of the main aims. Serbia has signed a strategic agreement with the Russian Federation on cooperation in the oil and gas sector, within which the project South Stream pipeline is planned to be realized. In addition, the Republic of Serbia has signed the Treaty that establishes the Energy Community and accepted the obligation to implement the Energy ...
    Consumption, natural gas, scenarios of development

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... is obvious that the availability requirement is much more stringent than the requirement of reliability, R(t) ≤ A(t). In real conditions of the exploitation and maintenance of technical systems, availability is shown appropriately Equations (1)–(3), depending on the data recorded. The conditions are ...
    ... input data. The paper presents the model by analyzing both old and new versions of three types of bulldozers operating in an open-pit mine for the exploitation of lignite. The analysis in this way provides guidance for selection and purchase, searching for weaknesses as well as the management of spare ...

  • Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia

    Fen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • 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 ...
    ... of textual database (catalogs): projects, archival documents and bibliogra- phies, library of geological projects documentation and exploration-exploitation approvals for water and solid mineral resources. One of the textual databases is the database of geological projects docu- mentation that contains ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... infrastructure and communication links must function flawlessly. In brief, there is a lot of work to be done before the TEL platform enters full exploitation to the benefit of university students in their preparation for the labor marker, and those who have graduated, in their lifelong learning endeavor ...

  • Rule-based Automatic Multi-word Term Extraction and Lemmatization

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac (2016)
    In this paper we present a rule-based method for multi-word term extraction that relies on extensive lexical resources in the form of electronic dictionaries and finite-state transducers for modelling various syntactic structures of multi-word terms. The same technology is used for lemmatization of extracted multi-word terms, which is unavoidable for highly inflected languages in order to pass extracted data to evaluators and subsequently to terminological e-dictionaries and databases. The approach is illustrated on a corpus of Serbian texts from ...
    term extraction, terminology, multi-word units, lemmatization, finite-state transducers
    ... annotated corpus 22M words, not disambiguated, distributed via owner. Stanković R. (2015). LeXimir v2, tool for creation, management and exploitation of lexical resources, distributed via owner. Krstev C., Vitas D. (2015). SrpRec, Serbian morphological electronic dictionary, http://www-igm ...

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... Local Water Resources of the Deep Aquifer of the “Šumice” Water Source in Kikinda, the Aspect of Quality and Quantity and the Definition of Exploitation Conditions for the period of next 20-30 years, Balby International, Belgrade, 2006. Paper submitted: 20.01.2014 Paper revised: ...

  • Simulation of Hydrogeological Environmental Discharge in Case of Interruption Constant Observations

    Marina Čokorilo Ilić, Dragoljub Bajić, Miroslav Popović (2024)
    Monitoring Network, data, hydrogeological environment, tunnel, simulation

  • Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling

    Branislav Petrović, Veljko Marinović, Zoran Stevanović (2023)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Automatic construction of a morphological dictionary of multi-word units

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Duško Vitas, Miloš Utvić (2010)
    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, multiwordn units, noun phrases, query expansion
    ... entries is a module of the LeXimir tool [6], which is written in C# and operates on the .NET platform. It supports development, maintenance and exploitation of various resources: e- dictionaries, wordnets, and aligned texts. A user of this tool need not use all of these resources, or even possess them ...