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Упит dcterms_subject_txt:geological range

334 items

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

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... between one and twelve months period. The short range plan defines resources and labor requirements, future production and cost. More distinct infor- mation about the nature of mineralization and equipment performance is required in short range than medium range planning. Operational planning is concerned ...
    ... stockyard piles by reclaimer, so that the total sulfur con- tent of the reclaimed coal is minimised, while retaing the its heating value within requred range. Bed blending assumes that each reclaim slice (fig. 3) includes equal amounts of material from all layers of material stacked. This is good app ...
    ... volume. More precisely, let Xij be the average grade of the material in layer i such that its dis- tance from the beginning of the layer is in the range [(j – 1)d, jd] where d is the cut depth of the reclaimed. Now, the layers can be described by the matrix: X X X X X X X X X n n m m mn 11 12 ...

  • Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis

    Ivan Kojić, Achim Bechtel, Reinhard Sachsenhofer, Dragana Životić, Ksenija Stojanović (2019)
    ... performed by mild open system pyrolysis durnng 4 hours at the temperatures ог 400 "С (Pyr400). 450 *C (Pyr450) and 500 *C (Pyr500). This temperature range was chosen according (0 data from thermogravimetric analysis which inđicate that the first significant mass 1055 (after releasing ог moisture) occurs ...
    ... Index, CPI ~ 1). ја lignite extracts 67С was measured only оп С)5-С31 odd n-alkanes, whereas in the pyrolysis prođucts it was determined in the range from С17 (0 Сж, showing decreasıing trend with chain length ın all samples. п-С)5 and п-Ст have very close values in pyrolysates and lignite extracts ...

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... 57.30 97.65 64.47 Range 22.19 199.68 27.39 106.61 99.51 90.66 StDev. 3.91 34.71 13.88 53.72 18.92 46.04 CV 0.13 0.44 0.59 0.94 0.19 0.71 As we can see in the Figures, review of the statistical data processing confirms the differences between investigated samples. Range implies difference ...
    ... represent a reference value called zero interval. In relation to zero interval we compute distance to the current interval. That distance shows a range of closeness between zero interval and current interval given by: 𝐷𝑀(�̂�, �̂�) = 𝑚𝑎𝑥{|𝑝𝑙 − 𝑧𝑙|, |𝑝𝑢 − 𝑧𝑢|} (2) Investigation ...
    ... of the directions. Differences between isotropic and anisotropic samples are obvious. Anisotropy coefficients for isotropic samples cover a less range of values than the anisotropy coefficients for anisotropic samples. It means that anisotropy coefficients for isotropic samples follow each other ...

  • The impact of calculation of resources and reserves on mining activity in Serbia

    Jelena Zakonović, Katarina Urošević, Radmila Gaćina (2019)
    The appearance of interest of the world's most important mining companies i for investment in Serbia imposes the problem of harmonization of domestic legislation with foreign ones. In this paper, specific categorization and classification of mineral raw materials, which do not match in domestic and foreign practice, are treated. The existence of such a conflict of criteria in use for categorization and classification can lead to misunderstanding and create certain complications in business. The following sections outline some of ...
    geological exploration, deposits, solid mineral raw materials, mineral projects, mineral resources and reserves

  • Rezultati geoloških istraživanja lignita Kostolačko-kovinskog ugljonosnog basena – geološke i morfostrukturne karakteristike

    Bogoljub Vučković, Biljana Radovanović, Vesna Matić, Lidija Glamočanin, Bogdan Radić, Ksenija Eraković, Dragana Životić (2022)
    Geološka istraživanja Kostolačkog basena i ležišta Kovin vrše se više od 80 godina, dok eksploatacija traje više od 100 godina. Tokom dugog perioda rudarskih aktivnosti na površini od oko 320 km2, izbušeno je preko 3.200 bušotina i više od 265.000 m jezgra. Nova saznanja o geološkim karakteristikama, morfologiji i kvalitetu ugljenih slojeva nameću neophodnost reinterpretacije i izrade jedinstvenog 3D modela Kostolačko-kovinskog basena. Primenom savremenih softverskih paketa olakšano je povezivanje ugljenih slojeva sa posebnim osvrtom na morfologiju i kvalitet slojeva i ...
    lignit, Kostolac, Kovin, geološka istraživanja, 3D model

  • Cytotoxic activity of tetradentate Schiff Base Copper(II) complexes

    Nevenka Gligorijević, Aleksandar Mijatović, Sandra Aranđelović, Rada Baošić (2021)
    Istraživanje kompleksa bakra kao potencijalnih antikancerogenih agenasa nudi ohrabrujuće perspektive u odnosu na komplekse platine (II) računajući na smanjenu toksičnost, novi mehanizam delovanja, različit spektar aktivnosti i perspektivu neunakrsne rezistencije. Kompleksi Šifovih baza bakra(II) koji sadrže tetradentatne ligande acac2en tipa (acac2en (1); tfacac2en (3), acactfacacen (4), acacphacacen (6)) pokazali su važnu antioksidativnu aktivnost, visok potencijal za interakciju sa HSA i DNK, u prethodnim studijama. Zbog toga je bilo interesantno ispitati i uporediti potencijal antikancerogene aktivnosti in vitro, u odnosu ...
    Bakar(II) kompleksi, citotoksičnost, ćelijski ciklus

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... complete exclusion of oxygen [11] in a temperature range between 350 and 800 "C, whereas gasification usually takes place in the presence of oxy- gen, steam or carbon dioxide at typical temperatures of 800 'C or more [10,12]. The typical temperature range for hydrothermal carbonization is 150–300 "C [13] ...
    ... higher than the reported range [101]. Bands at 1234 cm ' for CS180h and 1231 cm PLOS ONE | hitps://doi.org/10.1371/journal.pone.0277365 November 17, 2022 25/38 PLOS ONE Surface functional groups and degree of carbonization of selected chars for M200h are in the range for signals of aryl C-O stretch ...
    ... were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were cho- sen to cover a wide range of chemical composition and structural properties as a hardness test for the analytical methods used in this study. Specific problems connected with ...

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... properties of �y ash and slag. No. humidity of the sample (w) [%] Fraction <63µm (<63 µm) [%] Density <2.9 (<2.9) [g/cm3] pH values Mena Range Mena Range Mena Range NT A – m 0.43 0.30-0.57 40.67 16.0-68.0 2.11 2.05-2.15 11.88 NT A – j 0.29 0.22-0.38 22.67 16.0-30.0 2.09 2.08-2.10 12.76 NT B – m 0.26 ...
    ... available at: www.dr.rgf.bg.ac.rs 2016 | 69/3 | 317–324 | 6 Figs. | 4 Tab. | www.geologia-croatica Journal of the Croatian Geological Survey and the Croatian Geological Society 1. INTRODUCTION Fly ash is the product of burning coal and arises from inorganic substances melting in the thermal ...
    ... obtained with CuKα radiation (λ=1.54178x10–10 m), created in the X-ray tube at 30mA and a voltage of 40kV. Sample record- ing was performed in the range of 2θ from 5 to 50° with a step of 0.02° and a retention time of 0.5s at each step. The data posi- tion of the diffraction peaks 2θ (°), the value ...

  • 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
    ... Geologists Memoiry 45; AAPG: Tulsa, OK, USA, 1988. 29. The Serbian Ministry of Natural Resources and Environmental Protection. Geological Atlas of Serbia 1:2.000.000 No. 1 Geological Map, 2nd ed.; The Serbian Ministry of Natural Resources and Environmental Protection: Belgrade, Serbia, 2002. 30. United Nations ...
    ... well with a temperature of 54 ◦C is suitable for direct use. The calculated thermal power, which can be obtained from geothermal energy is in the range of 300 to 950 kW. The development concept was proposed with an architectural design to enable sustainable energy efficient development of wellness and ...
    ... (through geothermal power plants or through cogeneration systems) [1] and space heating and cooling (using the heat pumps) to direct use in a wide range of applications in areas such as balneotherapy [2,3], agriculture, industry, swimming pool heating, and in individual and district heating systems [4 ...

  • 100th Anniversary of the Carpathian-Balkan Geological Association (CBGA)

    Ljupko Rundić (2022)
    Током 22. конгреса Карпатско-балканске геолошке асоцијације (KБГА) одржаног у Пловдиву, Бугарска (7–11. Септембар, 2022) обележена je стогодишњица оснивања KБГА. Резолуција о оснивању „Карпатске геолошке асоцијације“ усвојена је на 13. Међународног геолошком конгресу у Бриселу, 19. августа 1922.године. То је био резултат ранијих напора и иницијативе Р. Кетнера (Чехословачка), Ј. Новака (Пољска), Г. Мунтеану Мургочија (Румунија) и В. Петковића (Југославија). Касније, после Другог светског рата, асоцијација мења назив у „Карпатско-балканска геолошка асоцијација (КБГА) “. Током протеклих 100 година, КБГА је ...
    Карпатско-балканскa геолошка асоцијација (КБГА), 1922–2022.

  • Application of the PROMETHEE and VIKOR methods for selecting the most suitable carbon dioxide geological storage option

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2019)
    CO2 storage in geological formations is one of the leading solutions for mitigation of greenhouse gas emissions. Types of geological formations that can be used for CO2 storage, that are discussed in this paper are: depleted oil and gas reservoirs, saline aquifers and injection CO2 in partially depleted oil reservoirs for enhanced oil recovery (EOR–CO2 method). In order to select the most suitable geological storage of CO2, the ranking of these storage options was performed using two methods of ...
    Prometej, vikor, višekriterijumsko odlučivanje, geološko skladištenje

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... content (55-68% range). Only PGB-W1 contained more mineral matter, which resulted in a reduced TOC (39%) (Table 2). Generally, the TOC content of the studied materials corresponded with their rank (Strapoc et al., 2011). The reaction of the analysed lignites was also alike and in the neutral range (pH6–7.7) ...
    ... to recognize GHG release from the lignites collected from themain deposits of Poland, Slovenia and Serbia. GHG productionwas studied along with a range of physical and chemical parameters that are crucial for microbial growth and activity. The microcosm experiments showed that the main gas emitted ...
    ... deposits exploited in Poland, Slovenia and Serbia, which represent various lithotypes, ages and burial histories. GHG production was studied along with a range of physical and chemical parameters that are crucial for microbial growth and activity. 2. Materials and methods 2.1. Sampling sites Lignites were ...

  • Integrating landslide magnitude in the susceptibility assessment of the City of Doboj, using machine learning and heuristic approach

    Cvjetko Sandić, Miloš Marjanović, Biljana Abolmasov, Radislav Tošić (2023)
    In this work, landslide assessment of the Doboj City area was modeled by combining machine learning and heuristic tools. The machine learning part was used to map the Morphometric factor. i.e. probability of landslides based on relation between the magnitude of events and morphometric parameters: elevation, distance to streams, slope, profile curvature, and aspect. The Random Forest and Support Vector Machines algorithms were implemented in the learning protocol, which included several strategies: balancing of the training/testing set size, algorithm ...
    podložnost na kliženje, magnituda klizišta, mašinsko učenje, heuristički pristup, Doboj

  • Application of the principle of circular economy to the thermal groundwater, the example of the municipality of Bogatić

    Marija Jovanović, Vesna Ristić Vakanjac (2021)
    There are about 360 locations of thermal and thermo-mineral waters in Serbia, whose water temperatures range from 14 to 98°C, which ranks Serbia as the richest European country in geothermal energy. The mentioned water resources (thermal and thermomineral waters) are used, mostly, for therapeutic purposes in spas and sports and recreational centers. The main problem that is present is the fact that they are not used in a rational and efficient way. The paper will give examples territorially related ...
    water-food-energy nexus, geothermal resources, groundwater management, sustainability, Bogatić

  • Synthesis of MnCo2O4 nanoparticles as modifiers for simultaneous determination of Pb(II) and Cd(II)

    Vesna Antunović, Marija Ilić, Rada Baošić, Dijana Jelić, Aleksandar Lolić (2019)
    The porous spinel oxide nanoparticles, MnCo2O4, were synthesized by citrate gel combustion technique. Morphology, crystallinity and Co/Mn content of modified electrode was characterized and determined by Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction pattern analysis (XRD), simultaneous thermogravimetry and differential thermal analysis (TG/DTA). Nanoparticles were used for modification of glassy carbon electrode (GCE) and new sensor was applied for simultaneous determination of Pb(II) and Cd(II) ions in water samples with the ...
    MnCo2O4 nanočestice, modifikatori, određivanje Pb (II) and Cd(II)

  • Fluid inclusion study in quartz of the Rudnik Pb-Zn-Cu-Ag skarn deposit, Serbia

    Stefan Petrović, Ronald J. Bakker, Vladica Cvetković, Rade Jelenković (2023)
    Six types of fluid inclusions were identified in three growth zones of hydrothermal quartz from the Rudnik skarn deposit. In the core zone, primary two-phase fluid inclusions of high (type 1) and moderate salinity (type 2) homogenized to liquid between 350-430 °C and 340-420 °C, respectively. Raman analysis revealed that the vapour phases are a CO2-CH4 gas mixture, with a predominance of CO2. The core contains and dispersed vapour-rich fluid inclusions of low salinity (type 3) composed of CO2-CH4-H2S ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... the interval of vitrinite reflectance from 1.00 to 1.40% [8]. Lignite and low-rank bituminous coal have huminite/vitrinite reflectance (Rr) in the range from 0.30 to 0.50% and cannot be used for coking. Our previous investigations showed that Serbian lignite is not suitable for coal briquetting, whereas ...
    ... the interval of vitrinite reflectance from 1.00 to 1.40% [8]. Lignite and low-rank bituminous coal have huminite/vitrinite reflectance (Rr) in the range from 0.30 to 0.50% and cannot be used for coking. Our previous investigations showed that Serbian lignite is not suitable for coal briquetting, whereas ...
    ... <30%). The objective was to examine and confirm the existence of a synergetic effect during low-quality lignite and HDPE co-pyrolysis, using a wide range of methods, and to establish the minimal co-pyrolysis temperature, which is required for a considerable synergetic effect. The manuscript also considers ...

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... tion on mining block level 2.1.7. Discretization on mining cuts level of and reporting Discretization of geological model on mining blocks is suitable for both long and short range production planning, but it can’t provide answers regarding current excavation (real time excavation). For ...
    ... between power plant and Kolubara Basin, delivered coal should have lower calorific value (LCV) in range 6700 kJ/kg  5%. The goal of operational planning of excavation is to achieve this range as much as possible. LCV for first mining cut (Figure 8.) is defined with equations: LCVI cut = ...
    ... based on correlation between Ash and LCV (Figure 4). Figure 4. Preliminary statistic analyses of Ash/LCV corelation 2.1.2. Geological Modeling The geological model for Tamnava West was developed using the Minex software package with the data provided by EPS. To provide a better structural ...

  • 3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia

    Saša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac (2013)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Geothermal potential, chemical characteristic and utilization of groundwater in Serbia

    Tanja Petrović Pantić, Katarina Atanasković Samolov, Jana Štrbački, Milan Tomić (2021)
    To collect and unify data about all geothermal resources in Serbia, a database was formed. The database allows us to perceive the geothermal resources of Serbia and their potential for utilization. Based on the data available in the geothermal database, the estimated temperatures of reservoirs, heat power, and geothermal energy utilization were calculated. The database contains 293 geothermal records (springs, boreholes) registered at 160 locations, with groundwater temperatures in the range between 20 and 111 °C. The maximum expected ...
    Geothermal database, Geothermal resources, Geothermal potential, Hydrochemistry, Hierarchical cluster analysis, Serbia