Претрага
231 items
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Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention
Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol InjectionMilica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović. "Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention" in Underground Mining Engineering, Beograd : Rudarsko-geološki fakultet (2023)
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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... -8000 Polished rod position (in} Polished rod position (in} Rotaded card Rotaded card Surface card Dovwnhole card Surface card Downhole card c) Lo ad (I b} o — Lo ad (Ib} ) [-] 8 Š } [[ (3} 0 30 40 50. Polished rod position (in} Polished rod position (in} 42 Figure ...
... 0 30 40 50 60 -8000 -4000 Polished rod position {in} Polished rod position (in) Rotaded card Rotaded card Surface card Downhole card Surface card Downhole card o < Lo ad {Ib } Lo ad |Ib } Polished rod position {in} Polished rod position (in} Figure 6.2. Examples of sensor faults ...
... rapid algorithm changes. It is 58 also important to first test algorithms without tuning, and then with hyperparameter tuning to determine if adjustments improve accuracy. After testing, algorithms with better performance should be validated on larger datasets. Additionally, considering the use ...Maja Trikić. Application of machine learning for diagnosing the operation of a deep well pump in oil production, 2024
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Stratigraphic position of the Danube River Terraces in Eastern Serbia
Tanasković Ljiljana, Stejić Petar, Nenadić Draženko. "Stratigraphic position of the Danube River Terraces in Eastern Serbia" in Comptes rendus de l'Académie Bulgare des Sciences 5 no. 70, Sofia: (2017): 671-679
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Stratigraphical position of pleistocene fluvial polycyclic deposits of Serbia
Nenadić Draženko, Gaudenyi Tivadar (2013)Nenadić Draženko, Gaudenyi Tivadar. "Stratigraphical position of pleistocene fluvial polycyclic deposits of Serbia" in Programme & abstracts / One Day Workshop Neogene and quaternary stratigraphy - actual terminology and nomenclature, Belgrade, September 20, 2013, Beograd:Serbian Geological Society (2013): 44-47
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The stratigraphical position and the use of the term Eopleistocene in Serbian geological literature
Gaudenyi Tivadar, Nenadić Draženko, Jovanović Mlađen, Bogićević Katarina. "The stratigraphical position and the use of the term Eopleistocene in Serbian geological literature" in Quaternary International no. 319, Oxford:Pergamon (2014): 150-159
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Геофизичко-геолошка испитивања источног обода Вардарске зоне ( Geophysical-geological inferences on the geotectonic position of the East Vardar ophiolites)
Петровић Драгана (2013)Петровић Драгана. "Геофизичко-геолошка испитивања источног обода Вардарске зоне ( Geophysical-geological inferences on the geotectonic position of the East Vardar ophiolites)" in Записници Српског геолошког друштва за 2013. годину (Comptes rendus des séances de la Société Serbe de géologie pour l' année 2013), Београд:Српско геолошко друштво (2013)
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Vertical Mineralization Interval and Forecast of the Orebody Position in the Alšar Sb-As-Tl Deposit, FYR Macedonia
Jelenković Rade, Boev Blažo (2011)Jelenković Rade, Boev Blažo. "Vertical Mineralization Interval and Forecast of the Orebody Position in the Alšar Sb-As-Tl Deposit, FYR Macedonia" in Geološki anali Balkanskog poluostrva no. 72, Beograd:Rudarsko-geološki fakultet (2011): 119-129. https://doi.org/10.2298/GABP1172119J
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Stratigraphical position of Pleistocene fluvial deposits of southeastern Srem and the Danube terraces in eastern Serbia
Nenadić Draženko, Gaudenyi Tivadar, Bogićević Katarina, Ganić Meri. "Stratigraphical position of Pleistocene fluvial deposits of southeastern Srem and the Danube terraces in eastern Serbia" in Bulletin of the Natural History Museum no. 8, Beograd: (2015): 7-19
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The application of Euler deconvolution for defining the position and depth of magnetic anomaly sources
Ignjatović Snežana, Vasiljević Ilija, Negovanović Milanka, Kričak Lazar, Pantović Radoje. "The application of Euler deconvolution for defining the position and depth of magnetic anomaly sources" in Proceedings of the 49th International October Conference on Mining and Metallurgy IOC 2017, Bor, Serbia:University of Belgrade, Technical Faculty in Bor (2017): 471-475
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Increasing the Local Road Network Resilience from Natural Hazards in Municipalities in Serbia
Biljana Abolmasov, Miloš Marjanović, Ranka Stanković, Uroš Đurić, Nikola Vulović. "Increasing the Local Road Network Resilience from Natural Hazards in Municipalities in Serbia" in Progress in Landslide Research and Technology, Volume 3, Issue 1, Springer Cham. (2024). https://doi.org/https://doi.org/10.1007/978-3-031-55120-8_22
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Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”
... solutions were conditioned by the spatial position and geometry of the open pit including appertaining structures, underground mine chambers constructed in the seventies within the underground production system at that time, as well as by spatial position and geometry of the bauxite deposit (Qiang ...
... analysis of standard deviation for the position of the last point E420-10 in terms of adopted tolerances for parameters to be set out, indicate: - that standard deviation for setting out direction angles of σ β = ± 20" causes standard deviation for the position of the last point of ; - that standard ...
... resource mining contain in certain cases speci�c technical and technological solutions, these being the result of the mine’s characteristic spatial position and the geometry of the ore deposit, existing mining works, struc- tures, and terrain relief etc. For the purpose of completion of the mining project ...Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić. "Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”" in Revista Escola de Minas, School of Mines Magazine, Sao paulo, Brasil : SciELO (2015)
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Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept
Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov. " Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept" in Engineering Geology , Elsevier (2019). https://doi.org/10.1016/j.enggeo.2019.05.007
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Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm
Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering... checks, based on the most unfavorable scenario, it is possible to reliably conclude which wind turbines do not have the optimal position and to correct their position in order to eliminate negative impacts. In this way, potential negative spatial/territorial impacts are eliminated in the planning ...
... of Belgrade, 11000 Belgrade, Serbia; aleksandar.cvjetic@rgf.bg.ac.rs * Correspondence: bosko@iaus.ac.rs Abstract: Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems ...
... SEA. These methods positively affect the application of the principle of preventive protection through the opti- mal selection of the number and position of wind turbines on one hand and the objectivity of draw- ing conclusions based on which strategic decisions are made in the final phase of the SEA ...Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić. "Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm" in Energies, MDPI AG (2021). https://doi.org/10.3390/en14196174
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GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities
Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević . "GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities" in Contributions to International Conferences on Engineering Surveying. Springer Proceedings in Earth and Environmental Sciences, Dubrovnik, Croatia, October 22-23, 2020, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-51953-7_21
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Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)
Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...Nevenka Novaković, Predrag Dabić, Vesna Matović. "Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2023). https://doi.org/10.1007/s12665-023-10794-6
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Palaeoflora of Kamenica (Pranjani Basin, western Serbia)
Palaeofloras of the Paleogene in Serbia are relatively rare, especially in comparison with floras from Neogene sediments. Most Paleogene phytoas sociations from the territory of Serbia existed in a dry and warm climate. The youngest Paleogene phytoassociation originates from the Pranjani Basin (Western Serbia), locality Kamenica. The age of this palaeoflora is determined as Late Oligocene. This fossil plant assemblage is different from other Paleo gene phytoassociations.The palaeoflora from Kamenica is characterized with leaf imprints larger than in other ...... MiLiVojEVić & iVAnA VASiLjEVić Geol. an. Balk. poluos., 2019, 80 (2), 53–6354 Fig. 1. Position of Čačak-Kraljevo Basin and position of palae- oflora locality. Fig. 2. Gravity anomaly map (Dg) with the position of Neogene basins (yellow shaded areas) and the location of the paleontolog- ical site ...
... correlation between the position of Neogene basins and the distribution of gravity anomalies. Neogene basins are filled with sediments of low density, in comparison to the density values of the basement and surrounding rocks. In the pre- sented study area (Fig. 2), the position of Neogene basins mostly ...Zorica Lazarević, Ljubica Milovanović, Jelena Milivojević, Ivana Vasiljević . "Palaeoflora of Kamenica (Pranjani Basin, western Serbia)" in Geološki anali Balkanskog poluostrva, Beograd : Rudarsko-geološki fakultet (2019). https://doi.org/10.2298/GABP1902053L
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Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data
Vesna Cvetkov, Ilija Vasiljević, Mirko Petković. "Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data" in 5. Hrvatski geološki kongres. Abstract Book 5th Croatian Geological Congress, Hrvatski geološki institut (2015)
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Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata
... [Burrough & McDonnel, 2006]. Simply put, spatial or geographic data are data on geographic entities, that is, data that identify the geographic position and shape of natural and artificial objects, such as roads, rivers, cadastral parcels or landfills. Namely, any object that can be represented on ...
... model the geology and the terrain, estimate the reserves, plan the yearly production, monitor statistical data on exploitation costs, monitor the position and availability of mining equipment (excavators, conveyor belts, trucks, etc.), the state of mining objects, works on mine benches coal and waste ...
... namely: attributes (data describing a geographic entity numerically or textually), geometry (data defining the shape and size of an entity and its position in space) and topology (data defining relations between different geographic entities). Consequently, there are three basic groups of data in a GIS ...Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović. "Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata" in Podzemni radovi, Beograd : Univerzitet u Beogradu - Rudarsko-geološki fakultet (2012)
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Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation
The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...... rising Fig.7 a The position of Dark Gate and the direction of water draining from slope; b directions of water moving down slope and rising from the ground Linear damage index - Dl,„ 82007 02014 quantifiable evidence that the eastern side is more damaged due to its position and contact with the ...
... facades, cast-west oriented parts of the gate). This approach allowed assessment and comparison of weath- ering rates according to the gate's position and the expo- sure of the stone to environmental influences. The linear damage index showed that the moderate damage is the dominant category ...
... separated as the zone of the monument that had suffered the heaviest damage. Differ- ences among the values of damage indices showed that the position of the gate is one of the main causes of the present state of stone blocks built in the Dark Gate. They also showed that a carefully made damage ...Maja Franković, Nevenka Novaković, Vesna Matović. "Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation" in Environmental Earth Sciences, Springer Science and Business Media LLC (2015). https://doi.org/10.1007/s12665-014-3843-z
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Application of ERT in the study of debris-flow source area: Case study Selanac debris flow
Dragana Đurić, Jelka Krušić, Biljana Abolmasov. "Application of ERT in the study of debris-flow source area: Case study Selanac debris flow" in 11th Congress of the Balkan Geophysical Society, Volume 2021, Online-Romania, 10 -14. Oct 2021,, European Association of Geoscientists & Engineers (2021). https://doi.org/10.3997/2214-4609.202149BGS15