Претрага

Упит dcterms_subject_txt:variability of coal quality

2845 items

  • 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

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... The Coal Mine Pljevlja Management Information System, Proceedings of the Fifteenth International Symposium on Mine Planning and Equipment Selection, Torino, Italy, Vol. 1, pp. 436-441, 2006. [6] Krstev, C., Stankovic, R., Obradovic, I., Vitas, D., Utvic, M., Automatic Construction of a Mo ...
    ... such as "has/is constructive characteristic (of)" or "has/is technological parameter (of)". By the introduction of such relations the semantic structure of RudOnto acquired features of semantic network. As RudOnto is a multilingual resource, another type of relations is introduced, namely those between ...
    ... form a hierarchical tree, subsets of concepts form sub-trees of this tree. The export of a subset of concepts in the form of a sub-tree develops as follows. The users selects a node (concept) in the hierarchy depicted in Figure 3. This node represents the root of the sub-tree that is going to be ...

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... small number of measured structural elements (no systematic measurements of the direc- tion of inclination of layers, stress analysis, etc.) as well as the morphological diversity of the area were the main reasons for geomorphologic consideration in order to try to identify the po- sition of neotectonic ...
    ... ments of given length (~ 2km) and plotted on a rose diagram (Fig. 17b). The statistical interpretation of the linear features (ori- entation of river valleys, changes of slope angles, and sharp turns of water flows, etc.) as well as the main fault categories separated in the wider area of Mt. Avala ...
    ... Pennins. Balk., 61/2, 15–49. DOLIĆ, D. (1998): The relationship of Paratethyan and Miocene lake deposits of Serbia. Proceedings of XIII Congress of Geologists of Yugoslavia, v. 2, p. 373–382. DOMBRÁDI, E. (2012): Deformation of the Pannonian lithosphere and related tectonic topography: a depth ...

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... Poland: copper mines Rudna and Legnic-Glogov and coal mine Upper Silezia. In all the examined cases, the results of the analysis indicated that the time series of strong ground motion in north-south and vertical direction, induced by the excavation of underground chambers, belong to nonlinear processes ...
    ... 2004. Environmental impact of mining activity in the Upper Silesian coal basin (Poland), Geologica Belgica, 7, 225-229. 28. Carlson, J. M. 1991. Two-dimensional model of a fault. Physical Review A 44, 6226-6232. 29. Carlson, J., Langer, J. 1989. Mechanical model of an earthquake fault, Physical ...
    ... and Reddish, D. 1994. The development of surface steps during mining subsidence: not due to fault reactivation, Engineering Geology 6, 43-255. 44. Donnelly, L. 2006. A review of coal mining induced fault reactivation in Great Britain, Quaternary Journal of Engineering Geology and Hydrogeology 39 ...

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... Poland: copper mines Rudna and Legnic-Glogov and coal mine Upper Silezia. In all the examined cases, the results of the analysis indicated that the time series of strong ground motion in north-south and vertical direction, induced by the excavation of underground chambers, belong to nonlinear processes ...
    ... 2004. Environmental impact of mining activity in the Upper Silesian coal basin (Poland), Geologica Belgica, 7, 225-229. 28. Carlson, J. M. 1991. Two-dimensional model of a fault. Physical Review A 44, 6226-6232. 29. Carlson, J., Langer, J. 1989. Mechanical model of an earthquake fault, Physical ...
    ... and Reddish, D. 1994. The development of surface steps during mining subsidence: not due to fault reactivation, Engineering Geology 6, 43-255. 44. Donnelly, L. 2006. A review of coal mining induced fault reactivation in Great Britain, Quaternary Journal of Engineering Geology and Hydrogeology 39 ...

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN

  • 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)
    ... and that while carrying out of those operations, one must not strictly look at the alignment of instrument and signal, due to the fact that the lengths of sides are short, but one must also look at the quality of measurement of the instru- ment height and altitude of signal. 8. Acknowledgement ...
    ... FACULTY OF MINING AND GEOLOGY. The main mining project for under- ground mining of bauxite reserves remainingin the deposit "Podbracan". Belgrade: 2008. [In Serbian] THE GOVERNMENT OF THE REPUBLIC OF SERBIA. Rulebook on the method for executing of mine surveying. Of�cialGazette of the Republic of Serbia ...
    ... during the pre-project and project stage of mining, as well as during the construction of mining facilities and excavation of mineral resources. Speci�c features of the project concerning excavation of the remaining reserves of bauxite in the deposit of "Podbracan", and in this way the forthcoming mining ...

  • 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
    ... help of experts. In this study, a tool was developed to facilitate manual classification of well logs by accessing a PostgreSQL database and allowing quick navigation between wells and their logs. The application displays surface logs along with well logs and guidelines indicating the quality of ...
    ... from bending. Bending can cause rapid wear of the sucker rods and damage to the tubing. Installing a tubing anchor provides improved pump performance. Sucker rods are made from high-quality steel and can be either hollow or solid. Hollow rods are used for injecting additives or removing paraffin ...
    ... detected, algorithms can automatically adjust parameters to maintain optimal operation. Machine learning can assist in continuous monitoring and quality control of pump operation, identifying any disruptions that may impact performance. 5. Visualization and reporting Visualization tools can present ...

  • 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 ...

  • 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 ...
    ... Kostolac Požarevac 0.285 0.732 -0.447 coal lignite; Kostolac Požarevac MAP 0.440 0.395 0.045 Improvement 11.49% The evaluation revealed that some NEs referring to the same entity occur in various forms which can deteriorate search results. For instance, the name of one person that documents refer to ...
    ... and general lack of readiness for the use of modern information technology. Consequently, the Ministry of Natural Resources and Environment Protec- tion, now the Ministry of Mining and Energy of the Republic of Serbia, launched in 2004 the project of the Geological Information System of Serbia, which has ...
    ... occurs in the Abstract field. The ranking of results is performed in descending order according to the total sum of the product of weight factors and the number of occurrences of the corresponding keywords. A specific feature of Serbian is the common use of two alphabets: Cyrillic and Latin, so a user ...

  • 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
    ... the direct bandgap in the V»Os nanoparticles based on the best line fitting of Kubelka-Munk functions. Still, in our case, it is impossible to decide the character of the allowed transition, considering the good quality of line fitting (Figure 6). In this work, the DFT approach was used to perform ...
    ... morphology and composition/quality of the catalyst were analyzed on SEM (JEOL JSM-6460LV, with the operating, voltage of 20 keV) equipped with an EDS INCAx-sighi detector and an “INAx-stream” pulse processor (Oxford Instruments, Abingdon, UK). The Raman scattering, spectra of the catalyst were taken ...
    ... version of the manuscript. Funding; This research was funded by the Ministry of Education, Science and Technological Devel- opment of the Republic of Serbia (grant no. 451-03-68/2022-14/200125 and grant no. 451-03-68/2022- 14/200126), Innovation Fund of the Republic of Serbia—Proof of Concept ...

  • Using Query Expansion for Cross-Lingual Mathematical Terminology Extraction

    Velislava Stoykova, Ranka Stanković (2018)

  • Анализа рада дисконтинуалног система на основу симулације утовара и транспорта целог површинског копа

    Милош Јовановић (2024)
    У овом раду анализира се рад дисконтинуалног система утовара и транспорта на површинским коповима користећи софтверски пакет Haulsim. Циљ истраживања је побољшање ефикасности процеса транспорта и оптимизација коришћења ресурса. Симулација је спроведена за различите сценарије утовара и транспорта, укључујући варијације у броју возила, њиховој брзини, капацитету, као и рутама транспорта. Добијени резултати су показали значајне могућности за унапређење постојећих процедура и смањење трошкова. Дисконтинуални системи су сложени и захтевају пажљиву анализу како би се постигла максимална продуктивност и смањење ...
    анализа, симулација, оптимизација, ефикасност, Haulsim
    ... B Materials _ |} x + Properies | Loadzand Haulloading Times _ Load and Camy Loading Times Name Coal - Arthracite. Properties Sand with Gravel - Dry Material Loader Bucket Fill Factor ? | Coal - Anthracite Insitu Bank Density 1.35| t/mš : - Hxcavatability Medium to Hard d P a Rewe | —I–J ——— ...
    ... Costing Data — Distribution Data 'Configuration Tray -- Operation Spot Time -Load |0.40 min 2400s Dump Time 0.20 | min | 12.00 | s [v/} Use Variability s Spot Time - Dump | 0.30. min | 1800 |s Load and Carry Loading Time | 1.00 | min | 60.00 Set Defaults Local Characteristics Engine Net Power ...
    ... радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository ...

  • Uticaj geološke neizvesnosti u razvoju rudarskih projekata

    Petar Marković, Dejan Stevanović, Mirjana Banković (2023)
    Rudarstvo je industrija koja se nosi sa različitim vrstama neizvesnosti i rizika zbog svoje prirode i specifičnosti. Neizvesnost u rudarstvu može poticati iz različitih izvora i uticati na različite aspekte rudarskih projekata. Kao jedan od dominantnih faktora, ističe se geološka neizvesnost. Geološka neizvesnost igra ključnu ulogu u rudarstvu i može značajno uticati na procenu resursa i rezervi, planiranje eksploatacije, ekonomsku isplativost i upravljanje rizicima. Ova neizvesnost se ne može eliminisati, ali se uz primenu adekvatnih standarda i zakona može ...
    ... MINERALI 2023 11% INTERNATIONAL CONFERENCE COAL AND CRITICAL MINERALS 2023 Zlatibor, 11-14. oktobar 2023. Zlatibor, 11-14 October 2023 UTICAJ GEOLOŠKE NEIZVESNOSTI U RAZVOJU RUDARSKIH PROJEKATA IMPACT OF GEOLOGICAL UNCERTAINTY IN THE DEVELOPMENT OF MINING PROJECTS Marković P.!, Stevanović D ...
    ... and reserves. Ore Reserves and Finance Seminar. AusiMM. Sydney. [20] Snowden D. V., Glacken I. and Noppe M. (2002). Dealing With Demands of Technical Variability and Uncertainty along the Mine Value Chain. Paper presented at Value Tracking Symposium. Brisbane, Qld. 92 [21] Stevanović D. (2015) ...
    ... the application of adequate standards and laws, it can be reduced. Through this paper, the differences in regional and foreign practice from the aspect of categorization of resources and reserves, as well as the influence of the degree of reliability of the geological characteristics of the deposit on ...

  • 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)

  • 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

  • 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

  • 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
    ... 2Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia; 3Innovation Center of Faculty of Chemistry, University of Belgrade, Belgrade, Serbia; 4Department of Mineralogy, Crystallography, Petrology and Geochemistry, Laboratory of Crystallography, Faculty of Mining ...
    ... 11000 Belgrade, Serbia; 3Innovation Center of Faculty of Chemistry, University of Belgrade, Belgrade, Serbia; 4Department of Mineralogy, Crystallography, Petrology and Geochemistry, Laboratory of Crystallography, Faculty of Mining and Geology, University of Belgrade, Đušina 7, 11000 Belgrade, Serbia ...
    ... Preparation of soil samples for sequential extraction Dry samples of soil (sand, humus and clay type of soil, about 10 g) had previously been saturated separately with 100 ml of lanthanum (III)- ion solution concentration of 50 mg L-1 and neodymium (III)- ion solution concentration of 50 mg L-1 so ...