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Упит dcterms_subject_txt:Choke Position Adjustments

231 items

  • Pre-failure deformation monitoring as rockfall prediction tool

    Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić (2021)
    General Engineering
    ... and assuming the constant wave velocity distance to reflected object is calculated and stored together with horizontal and vertical angle per each position. It can also detect reflectivity of the target point, as potentially valuable information in rock slope analysis (surface rock type, weathering ...
    ... scan (figure 3-4). In addition, a vertical profile line was constructed to extract cross-sections from point clouds for each sequence at the same position and provide 2D impression (XZ) of the componential and total displacements. Profile line is placed across the most active part of the AOI selection ...

  • Грешка инклинације код депозиционе реманетне магнетизације

    Mirko Petković, Vesna Cvetkov (2019)
    ... influence of the Earth's magnetic field in the geological past, with the aim of defining the spatial and temporal position of the investigated rock complexes. The spatial position of the remanent magnetization vector is determined by the paleo declination and inclination. However, the processes ...

  • Digitalizacija u rudarstvu: Kreiranje sistema za efikasno poslovno izveštavanje

    Stevan Đenadić, Aleksandar Mirković, Veljko Rupar (2024)
    Proces donošenja odluka u oblasti rudarstva i geologije uslovljen je blagovremenim posedovanjem kvalitetnih podataka i informacija. Kompleksnost rudarskih procesa nalaže prikupljanje podataka na dnevnom odnosno na smenskom nivou. Podaci kao takvi bez analitičkog pristupa nisu dovoljni. Kako bi pristup podacima bio brz i efikasan neophodno je posedovanje adekvatnog digitalnog rešenja uz adekvatne centralizovane baze podataka. U ovom radu je dat pregled trenutne pozicije rudarstva sa aspekta digitalne transformacije kao i predlog jednostavnog prototipa u obliku digitalnog sistema za poslovno ...
    rudarstvo, digitalna transformacija, baze podataka
    ... is necessary to have an adequate digital solution along with appropriate centralized databases. This paper provides an overview of the current position of mining from the perspective of digital transformation, as well as a proposal for a simple prototype in the form of a digital system for business ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... width b = 5 mm and length of l = 65 mm (Figures 7 and 8) [14,17]. σ σ σ (a) (b) Figure 7. Wedge test method: (a) the wedge and (b) wedge position while testing cutting force. This test method suggests that the rock sample is installed into a suitable hydraulic press, used to apply the vertical ...
    ... loads so that the surrounding (confining) pressure value is constant and that it acts uniformly in all directions (Figure 10). σ Figure 10. The position of the wedge in the modified wedge test method. Cutting resistance tests for underwater coal mining conditions were carried out by using the equipment ...
    ... 14. Modified triaxial test equipment for underwater coal mining cutting resistance testing: (a) modified triaxial test equipment, (b) testing wedge position. 7. Test Results 7.1. Triaxial Compression Test (Triaxial Test) Method The triaxial compressive strength is determined on coal samples of cylindrical ...

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... 0258 0.3861 SRP 4.4314 0.3122 ESP 6.9750 0.3086 HP 5.0320 0.3901 PCP 4.5774 0.3128 New well 6.1590 0.3410 Figure 7 shows that the position of new wells close to the position of the standard for method GL, with a slight tilt towards the ESP method. Energies 2020, 13, 1758 13 of 15 The sensitivity of ...
    ... maintenance (maintainability). It contains supportability and design predispositions for maintenance. Grades are given depending on the geographical position of the well and the well characteristics themselves, i.e., the possibility of quick and easy servicing of problems in the well. Figure 3. The ...
    ... maintenance (maintainability). It contains supportability and design predispositions for maintenance. Grades are given depending on the geographical position of the well and the well characteristics themselves, i.e., the possibility of quick and easy servicing of problems in the well. A3 = {spare parts ...

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... 7600000 ı model (DEM) of study area a with highlighted testing and training area; (b) Geographical position of study area (red poly- gon) within North Macedonia; (c) The geographical position of North Macedonia Elevation (m) BB so- 250 [ 250 - 5oo [Z soo - 750 [___] 750 - 1000 [___] ...
    ... machine (SVM) algorithm exhibited the highest computational time, while the RF and artificial neural netvorks (ANN) algo- rithms shared the second position. A prevalent strategy for reducing computational time involves the reduction of the number of features utilized, with the least informative ones ...
    ... via, Federal Geological Survey, Belgrade, p 61 (in Macedonian) Đurić D (2023) Overview on the Results of Potential Field Methods for the Spatial Position of East Vardar Ophiolites. In: Chitea F (ed) Insights of Geosciences for Natural Hazards and Cultural Herit- age. Zenodo. https://doi.org/10. ...

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... A short history of geolISSTerm and an overview of the structure and the way of arranging terms, in view of the terminological resources and the position of the geolISSTerm dictionary in the semantic spectrum is fol- lowed by a description of the approach to the development of the geologic terminology ...
    ... vocabulary, such as meronymy, antonymy, etc., as well as “is_used for”, “is derived_from” and those specific to geology, which will improve the position of geolISSTerm on the semantic scale, promoting it to the status of an ontology. 3. The GeolISSTerm data model 3.1. The approach to the development ...
    ... the fundamental unit in lithostratigraphic classification. A formation is a body of rock identified by lithic characteristics and stratigraphic position; it is prevailingly, but not necessarily, tabular and is map- pable at the earth’s surface or traceable in the subsur- face (NAcSN, 2005). Synonyms ...

  • Stratigraphy and microfossils (radiolarians and planktonic foraminifers) of the Upper Cretaceous (upper Santonian–lower Campanian) Struganik limestone (Western Serbia)

    Liubov G. Bragina, Nikita Yu. Bragin, Ludmila F. Kopayevich, Nevenka Đerić, Nataša Gerzina Spajić (2019)
    Paleontology, Stratigraphy, Ecology, Evolution, Behavior and Systematics

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Debris-flow Susceptibility Assessment in Flow-R: Ribnica River Case Study

    Ksenija Micić, Miloš Marjanović, Biljana Abolmasov (2024)
    Debris flows are among the most dangerous erosional geohazards due to the fast rate of movement and long runout zones. Even though the initiation can be triggered in mountainous areas, inhabited and with steep slopes, their propagation and deposition can endanger not only buildings and infrastructure in the urbanized areas, but also threaten human lives. As these initiation areas usually represent unattainable terrains with rapid vegetation cover development, field observations and aerial photo analysis become high-demanding tasks. Consequently, medium-to-regional ...
    tečenje drobine, Flow-R, procena podložnosti, empirijski model

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (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 ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

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

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... stockpile size and shape. Another feature of interface is visualization of cross section for differ- ent stacking granularity, for selected pile and position within pile, fig. 2. The shadings of layer's cross-sections in fig. 2 are corresponding to the percentage of sulfur. Stevanovi}, D. R., et al.: ...
    ... stockpile size and shape. Another feature of interface is visualization of cross section for differ- ent stacking granularity, for selected pile and position within pile, fig. 2. The shadings of layer's cross-sections in fig. 2 are corresponding to the percentage of sulfur. The reclaiming model Developed ...
    ... l mine scheduling model, stocking model and reclaiming model, fig. 5. According simulated daily or shift mine plan each BWE has working bench position and pro- duction parameters. Mass and quality control will be done by on-line devices and weightmeters on main belt conveyor. If coal quality ...

  • A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area

    Filip Anđelković, Dejan Radivojević (2018)
    baden, Beograd, facije, facijalna raznovrsnost, sedimenti
    ...  either  in their geo‐   235 graphical extent, or  the age and genesis of  these  sediments. A palaeogeographical‐facial map, which  displays the position of these facies as interpreted by Stevanović (1974), is shown in picture 1.   In their paper, Anđelković M. & Anđelković J. (1997) classified th ...

  • Understanding partitioning of deformation in highly arcuate orogenic systems: Inferences from the evolution of the Serbian Carpathians

    Nemanja Krstekanić, Liviu Matenco, Marinko Toljić, Oleg Mandić, Uroš Stojadinović, Ernst Willingshofer (2020)
    orogeneza, oroklini, višesmerna ekstenzija, transkurentna kretanja, Srpski Karpati
    ... structure (compiled after Balázs et al., 2016 and Matenco and Radivojević, 2012). Isoline numbers are in kilometres. Black rectangle indicates the position of Figs. 5, 7, 8 and 10. TF-Timok Fault; CF-Cerna Fault. Intramontane basins: 1-Bozovici Basin, 2-Sicheviţa Basin, 3-Donji Milanovac Basin, 4-Orşova ...
    ... the definition of new major tectonic contacts that are relevant at map scale. Furthermore, in order to understand the regional effects and super- position, we have also measured deformation at farther distances from major faults of shear zones (black faults in Figs. 5, 7, 8 and 10). Deformation has ...
    ... . Black faults are other major faults in the area. Suggested faults or faults covered by Neogene sediments are dashed. Black rectangle shows the position of the inset in right part of the figure. Inset: Simplified geological map of a segment of the Senje-Resava Basin thrusted by Permian sediments of ...

  • 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
    ... in concentration, the time taken to breach a certain quality objective and the corresponding exposure times [16]. Figure 1. Geographic position of study area GEOLOGICAL SETTING OF THE STUDY AREA Extensive geological research (exploratory drilling, geophysical activities, paleontological ...
    ... of the wells on the groundwater source, was simulated through a specific flux boundary. In this case, the flux was specified as a function of position and time. Figure 5 shows the positions of the wells, whose operation was simulated in the model with a specified prescribed-flux boundary condition ...

  • Structural and geochronological constraints from the Drina-Ivanjica thrust sheet (Western Serbia): implications for the Cretaceous–Paleogene tectonics of the Internal Dinarides

    Kristof Porkoláb, Szilvia Kövér, Zsolt Benkó, Gabor Héja, Melinda Fialowski, Balázs Soós, Nataša Gerzina Spajić, Nevenka Đerić, László Fodor (2019)
    Internal Dinarides, Drina-Ivanjica thrust sheet, Deformation history, K–Ar dating, Obduction, Structural analysis
    ... sediments Jadar-Kopaonik - Drina-Ivanjica East-Bosnian-Durmitor fold extension Europe undifferentiated e Position of the | I p compression s Southern Triassic unit [) Position of the Northern Triassic unit Cretaceous -– Paleogene thrust Late Jurassic thrust NE 70-45 Ma Collision ...
    ... basement. We propose that this southern Triassic originated from a more external Dinaridic thrust sheet and was trans- ported to its present-day position by a top-NE backthrust presumably during late Early Cretaceous-Paleogene times. Map- scale, NW-SE striking D„- thrust faults and abundant NW-SE ...
    ... more external Dinaridic thrust sheet, most likely from the East Bosnian-Durmitor thrust sheet, and having been transported to its present-day position by a top-NE backthrust (D-). 4. Latest Cretaceous-Paleogene collision between Adria and Europe is reflected in a brittte NE-SW shortening event ...

  • Избор одговарајуће механичке методе

    Анастасија Мирјанић (2024)
    Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина