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Упит dcterms_subject_txt:variability of coal quality

2854 items

  • Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

    Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)
    Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...
    Geochemistry and Petrology

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • Facies analyses, biostratigraphy and radiometric dating of the Lower-Middle Miocene succession near Zajecar (Dacian basin, eastern Serbia)

    Ljupko Rundić, Nebojsa Vasić, Miodrag Banješević, Dejan Prelević, Violeta Gajić, Bojan Kostić, Jelena Stefanović (2020)
    Седиментна сукцесија између доњег и средњег миоцена и складан тј. дискордантан однос између језерско-континенталних наслага (нпр. DLS, SLS) и баденских морских седимената представља једну од занимљивих тема. У овом раду смо проучавали пет истражних бушотина (источна Србија) и анализирали главни фацијални образац, биостратиграфске карактеристике миоценске сукцесије и применили U-Pb радиометријско датирање вулканских туфова интерстратификованих у седиментној серији са слојевима угља (бушотина NRKR-17002). Добиjeна је конкордија старост од 16,9 ± 0,2 милиона година за сва анализирана зрнца циркона без наследних ...
    Доњи–средњи миоцен, језерске фације, морска трансгресија, U-Pb геохронологија, источна Србија.

  • Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications

    Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (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 ...
    примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалима

  • Uticaji eksploatacije i deponovanja uglja na životnu sredinu

    Lilić Nikola, Cvjetić Aleksandar (2011)

  • Analiza primene višekriterijumskih metoda u optimizaciji izbora hidruličnih bagera na površinskim kopovima uglja

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Filip Miletić, Ivan Janković (2019)
    Hidraulični bageri primenjuju se u različitim oblastima privrede a najzastupljeniji su u građevinarstvu i rudarstvu. Na površinskim kopovima sa kontinualnim sistemima, klasifikuju kao pomoćna mehanizacija a na površinskim kopovima sa diskontinualnim sistemima, kao osnovna mehanizacija. Kako je u oba slučaja njihova primena neizostavna, važno je izvršiti adekvatnu analizu postojećih podataka, u cilju optimizacije izbora tipa hidrauličnog bagera u odnosu na uslove rada datog površinskog kopa. U radu su opisane različite višekriterijumske metode koje su korišćene za analizu hidrauličnih bagera. ...
    višekriterijumske metode, površinski kop uglja, pomoćna mehanizacija, hidraulični bager
    ... All advantages and disadvantages of these methods are presented, as well as the quality of output information which can affect the future purchasing decisions of this machinery. Key words: multi-criteria methods, open-cast coal mine, auxiliary machines, hydraulic excavators. https://doi.org/10 ...
    ... 2013. SUMMARY ANALYSIS OF THE APPLICATION OF MULTI-CRITERIA METHODS IN OPTIMIZING THE SELECTION OF HYDRAULIC EXCAVATORS ON OPEN-CAST COAL MINING Hydraulic excavators are used in different areas of industry, most often in construction and mining. On open-cast coal mines with continuous systems ...
    ... auxiliary machinery, while on open- cast coal mines with discontinuous systems they are basic machinery. As their application is necessary in both cases, it is important to carry out an adequate analysis of the existing data in order to optimize the choice of the type of hydraulic excavator in relation to ...

  • Oprema za rad na deponijama i efikasnost rada deponijskih mašina u funkciji od načina odlaganja i zahvatanja

    Ignjatović Dragan, Knežević Dinko, Jovančić Predrag (2011)

  • Опрема за континуалну контролу квалитета угља, on-line анализатори

    Кнежевић Динко, Колоња Божо, Игњатовић Драган, Деушић Славен, Вучинић Душица, Томанец Рудолф (2011)

  • Novi pravilnik o sadržini rudarskih projekata

    Kolonja Božo, Knežević Dinko, Lilić Nikola, Ignjatović Dragan, Danilović Dušan, Ivezić Dejan (2013)

  • Savremene metode deponovanja pepela i šljake i održivi razvoj

    Knežević Dinko, Stevanović Dejan, Banković Mirjana, Tomašević Aleksandra, Matko Zlatan, Lončar Stevan, Beatović Sreten, Nikolić Marijana, Pantelić Uroš (2013)

  • 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

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... natural gas instead of coal, increasing the energy efficiency, and separating CO2 after production using CCS technology which is one of the leading solutions. Capturing CO2 is the most expensive phase in CCS process and it accounts for approximately 75% of overall costs. The selection of CO2 capture systems ...
    ... using the natural gas instead of coal, increasing the energy efficiency, and CO2 separation after production using CCS which is one of the leading solutions [5]. At the present time, there are 26 large scale CCS facilities in operation worlwide (Figure 2), where 12 of them include capturing CO2 from ...
    ... atmosphere. The fossil fuel fired power plants burn a fossil fuel, such as coal or natural gas, to generate heat energy, and provide most of the world’s electricity today. There are various commercially available technological procedures that could be employed with post-combustion capture, but the ...

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... and availability of mining equipment (excavators, conveyor belts, trucks, etc.), the state of mining objects, works on mine benches coal and waste dumps. The application of GIS is especially important in the environment protection area, as it enables active monitoring of the impact of mining operations ...
    ... complexity of engineering tasks creates a need for tools that offer possibilities for high quality situation monitoring and comprehension, as well as prediction of our future line of action. Geographic information systems (GIS) are precisely such a tool. They offer support for implementation of various ...
    ... operations to environment: air, water and soil quality, determination of the level of risk to human health, flora and fauna, as well as planning of protection measures. An important advantage offered by geographic information systems is the establishment of relations between descriptive, alphanumeric, ...

  • Primena digitalne fotogrametrije u rudniku Rudnik

    Nikola Mirković, Luka Crnogorac, Katarina Urošević (2023)
    Digitalna fotogrametrija, lasersko skeniranje i virtuelizacija sve više pronalaze aktivne uloge u rudarstvu, prvenstveno zbog svoje široke mogućnosti primene. Laserskim skeniranjem i fotogrametrijom snimaju se i kreiraju 3D modeli otkopa, jamskih hodnika, površinskih kopova, površinskih objekata (zgrada, spomenika, predmeta), a vrši se skeniranje celih rudnika koji se rekonstruišu u 3D digitalne modele. Fotogrametrija predstavlja proces fotografisanja objekata pomoću fotoaparata i daljom obradom fotografija u različitim softverskim alatima kreiraju se realne kopije 3D modela objekata ili predmeta u digitalnoj formi. Za ...
    digitalna fotogrametrija, prostorna vizuelizacija, rudarski objekti, podzemna eksploatacija
    ... 109 financial investments of the company), 3D models of underground spaces can be obtained that are at a satisfactory level for the needs of geological mapping in the mine, insight of management and engineers into the state of underground spaces and quality assessment of performed mining works. In ...
    ... realistic copies of 3D models of objects or tools are created in digital form. For the development of high-quality 3D models, it is necessary to provide top-quality laser scanners, as well as supporting computer equipment (hardware and software) that can quickly process a huge amount of data and form ...
    ... M. (2013). Determination of volumetric changes from laser scanning at an underground limestone mine. Mining Engineering, 65(11) [8] Slaker, B., & Westman, E. (2014). Identifying underground coal mine displacement through field and laboratory laser scanning. Journal of Applied Remote Sensing, 8(1) ...

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • 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
    ... Conference “Coal 2013”, Zlatibor, Serbia, 02-05 October, 2013, Yugoslav Opencast Mining Committee, Belgrade, pp 259-266, 2013. 9. Mastilović Čoporda, T., Radojević, U., Vakanjac, B., Sorajić, S., Groundwater Quality analysis of the Deep Aquifer in Kikinda, Serbia, Proceedings of the 11th Int ...
    ... area of Kikinda’s groundwater source, aimed at providing the required amount of quality groundwater to meet the water demand of the population. The study area is situated in the southern part of the Pannonian Basin, which is a lowland that occupies the north of Serbia (Figure 1). The City of Kikinda ...
    ... Retardation of Aromatic Hydrocarbons, Ground Water, Vol. 33, No. 3, 469-475, 1995, http://dx.doi.org/10.1111/j.1745-6584.1995.tb00303.x 26. Babac, D., Study on the Analysis of the Local Water Resources of the Deep Aquifer of the “Šumice” Water Source in Kikinda, the Aspect of Quality and Quantity ...

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... marl. �e youngest sediments (Middle Miocene) were sampled near the Gacko coal mine. A piece of clean coal was tak- en from the main coal seam, formed on top of light grey marl. �e Gacko main coal seam has a thickness of 9 to 24 m (Mirković et al., 1974) and it was deposited during the Langhian ...
    ... marl. The youngest sediments (Middle Miocene) were sampled near the Gacko coal mine. A piece of clean coal was tak- en from the main coal seam, formed on top of light grey marl. The Gacko main coal seam has a thickness of 9 to 24 m (Mirkovic¢ et al., 1974) and it was deposited during the Langhian, ...
    ... hydrocarbon potential of the Adriatic basin, o�shore Croatia. Journal of Petroleum Geology, 38: 4–5. Yang, S. & Hors�eld, B., 2020. Critical review of the thermal un- certainty of Tmax in revealing the thermal maturity of organ- ic matter in sedimentary rocks. International Journal of Coal Geology, 225: ...