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213 items
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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 ...... 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 ...Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković. "Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic" in Energies, MDPI AG (2020)
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Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)
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 ...Pavle Tančić, Aleksandar Kremenović, Predrag Vulić. "Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)" in Powder Diffraction, Cambridge University Press (CUP) (2019). https://doi.org/10.1017/S0885715619000897
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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
... 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. ...Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski. "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" in Earth Science Informatics, Springer Science and Business Media LLC (2024). https://doi.org/10.1007/s12145-024-01243-4
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Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics
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 ...Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić. "Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics" in Minerals, MDPI AG (2024). https://doi.org/10.3390/min14050511
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Развој геолошког терминолошког речника ГеолИССТерм
... 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 ...Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić. "Развој геолошког терминолошког речника ГеолИССТерм" in INFOteka: časopis za informatiku i bibliotekarstvo, Beograd : Zajednica biblioteka univerziteta u Srbiji (2011)
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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)Liubov G. Bragina, Nikita Yu. Bragin, Ludmila F. Kopayevich, Nevenka Đerić, Nataša Gerzina Spajić. "Stratigraphy and microfossils (radiolarians and planktonic foraminifers) of the Upper Cretaceous (upper Santonian–lower Campanian) Struganik limestone (Western Serbia)" in Palaeoworld, Elsevier BV (2019). https://doi.org/10.1016/j.palwor.2019.05.001
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A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area
Filip Anđelković, Dejan Radivojević (2018)... 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 ...Filip Anđelković, Dejan Radivojević. "A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area" in 17th Serbian Geological Congress, Vrnjačka Banja, 17-20 maj 2018, Srpsko geološko društvo (2018)
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Application of stochastic models for mine planning and coal quality control
... 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 ...Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković. "Application of stochastic models for mine planning and coal quality control" in Thermal Science, Belgrade : Vinča Institute of Nuclear Sciences (2014). https://doi.org/10.2298/TSCI130201031S
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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)... 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 ...Nemanja Krstekanić, Liviu Matenco, Marinko Toljić, Oleg Mandić, Uroš Stojadinović, Ernst Willingshofer. "Understanding partitioning of deformation in highly arcuate orogenic systems: Inferences from the evolution of the Serbian Carpathians" in Global and Planetary Change, Elsevier BV (2020). https://doi.org/10.1016/j.gloplacha.2020.103361
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Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)
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 ...... 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 ...Dušan Polomčić, Dragoljub Bajić, Jelena Zarić. "Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)" in Journal of Sustainable Development of Energy, Water and Environment Systems (2015). https://doi.org/10.13044/j.sdewes.2015.03.0017
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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 ...Kristof Porkoláb, Szilvia Kövér, Zsolt Benkó, Gabor Héja, Melinda Fialowski, Balázs Soós, Nataša Gerzina Spajić, Nevenka Đerić, László Fodor. "Structural and geochronological constraints from the Drina-Ivanjica thrust sheet (Western Serbia): implications for the Cretaceous–Paleogene tectonics of the Internal Dinarides" in Swiss Journal of Geosciences (2019)
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Trans-Lithospheric Diapirism as a Possible Mechanism for Ophiolite Emplacement?
Nikola Stanković, Taras Gerya, Vladica Cvetković, Vesna Cvetkov. "Trans-Lithospheric Diapirism as a Possible Mechanism for Ophiolite Emplacement?" in EGU General Assembly 2024, Vienna, 14-19 April 2024, Göttingen : Copernicus GmbH (2024). https://doi.org/10.5194/egusphere-egu24-568
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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)Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt. "Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)" in International Journal of Earth Sciences, Springer Science and Business Media LLC (2015). https://doi.org/10.1007/s00531-015-1266-z
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Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone
The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm ...Emő Márton, Marinko Toljić, Vesna Cvetkov. "Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone" in Journal of Geodynamics, Elsevier BV (2022). https://doi.org/10.1016/j.jog.2021.101880
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The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector
Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...... accompany energy security analysis. The fuzzy–AHP synthesis model uses the asymmetric fuzzy inference approach for an outcome finding with the asymmetric position of fuzzy sets. The most important characteristic of the proposed model is its ability to operate with numerical and linguistic data and universality ...
... country’s economy, new investments and market’s development [1]. The energy security is one of the most important parameters in determining the current position/condition and in defining the future development of all countries and regions. Demand for energy in the region of Southeast Europe is growing, but ...
... accompany energy security analysis. The fuzzy-AHP synthesis model uses the asymmetric fuzzy inference approach for an outcome finding with the asymmetric position of fuzzy sets. The most important characteristic of the proposed model is its ability to operate with numerical and linguistic data and universality ...Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković. "The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12060908
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Еоценска фауна југозападног дела Сирт басена (Либија)
Љупко Рундић, Мери Ганић (2020)Љупко Рундић, Мери Ганић. "Еоценска фауна југозападног дела Сирт басена (Либија)" in Записници Српског геолошког друштва, Српско геолошко друштво (2020)
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An intelligent hybrid system for surface coal mine safety analysis
Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić. "An intelligent hybrid system for surface coal mine safety analysis" in Engineering Applications of Artificial Intelligence (2010)
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Availability as a dimension of energy security in the Republic of Serbia
Boban Pavlović, Dejan Ivezić (2016)There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...... another, and other values (2-8) are in between that range. One always enters the whole number in its appropriate position and automatically enters its recipro- cal in the transpose position [21]. For this purpose, the only one criterion for comparing the components is defined. That is individual c ...Boban Pavlović, Dejan Ivezić. "Availability as a dimension of energy security in the Republic of Serbia" in Thermal Science, National Library of Serbia (2016). https://doi.org/10.2298/TSCI160923303P
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Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)
... events that affected this unit (e.g. Himmerkus et al. 2009a, b; Mein- hold et al. 2010; Kydonakis et al. 2014, 2015a, b). Due to its particular position between the two divergent belts of the Alpine orogen, unravelling of thermal and deformation history of the SMM becomes essential for correct ...
... related to the shallow inclination Kobila area. For structural data in Vranjska Banja area, please see Fig. 8. Inset shows the relative scale and position in Fig. 3 of one of the limbs, whereas the generally steeply inclined foliations are measured along the other limb of F, folds. Occasionally ...
... southern part of Vlasina Unit, b northern part of Vlasina unit, and c Božica area. Symbol legend is given in Fig. 4. Inset shows the relative scale and position in Fig. 3 the axial-plane cleavage of tight to isoclinal recumbent folds F, (Fig. 10a). Due to their presumed kilometre-scale size, these folds ...Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel. "Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)" in International Journal of Earth Sciences, Springer Science and Business Media LLC (2016). https://doi.org/10.1007/s00531-016-1380-6
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Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules
The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analizaSvetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón . "Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules" in Bulletin of Engineering Geology and the Environment , Springer (2024). https://doi.org/10.1007/s10064-024-03667-0