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Упит dcterms_subject_txt:Numerical modeling

247 items

  • 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
    ... which affects the conditions for their application. The theory of fuzzy sets and, in general, fuzzy logic is a conceptual and mathematical tool for modeling different processes dominated by uncertainty, multidimensionality, subjectivity and indeterminacy. Optimization criteria were taken into account ...
    ... and Fuzzy Logic Techniques. Energy Sources Part A Recovery Util. Environ. Eff. 2014, 36, 1276–1284. [CrossRef] 3. Jafarinezhad, S.; Shahbazian, M. Modeling the Porosity of the Carbonate Reservoir Using a Genetic Type-2 Fuzzy Logic System. Energy Sources Part A Recovery Util. Environ. Eff. 2015, 37, 1354–1362 ...
    ... open-pit mines equpment - Study on the bases of fuzzy algebra rules. Eksploat. Niezawodn-Maint. Reliab. 2013, 15, 66–74. 24. Wang, J. A subjective modeling tool applied to formal ship safety assessment. Ocean Eng. 2000, 27, 1019–1035. [CrossRef] 25. Gluščević, A. Optimizacija rada bušotina u dubinskom ...

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... The VENTEX [2] system was developed as a knowledge-based (symbolic) upgrade of the SimVent numerical package and it thus belongs to the category of coupled numerical and symbolic systems. The numerical part consists of SimVent simulation routines and the symbolic part of the mine ventilation expert’s ...
    ... concept in complex mine ventilation network analysis. INVENTS is composed of a number of integrated software packages, which couple both well known numerical optimization and various artificial intelligence methods. By introducing heuristics into the knowledge base existing mathematical models are upgraded ...
    ... structure of the air pollution protection system is depicted in Figure 3. The system combines AI methods (GA and NN) coupled in PollutNet [3] with CFD modeling to attain a reliable estimation of air pollution distribution. The relations between GA, NN and CFD are largely influenced by the scale and quality ...

  • Uticaj utiskivanja gas-lift gasa na prenos mase i toplote

    Branko Grubač (2019)
    Nakon uvođenja kontinualnog gas-lifta, primećen je porast proizvodnje tečnog naftnog gasa, TNG, u postrojenju za preradu gasa, kao jednog od finalnih proizvoda dobijenog iz fluida gaso kondenzatnih i rastvorenog gasa iz naftnih bušotina. Pretpostavljeno je da se prisustvom gas-lift gasa uspostavlja drugačija ravnoteža faza u odnosu na slučaj bez gaslifta, te da je gas-lift gas stripovao propan i butane iz tečne u parnu fazu, što je dovelo do povećanja prinosa TNG-a. Napravljen je model bušotine koja radi u kontinualnom gas-liftu ...
    gas-lift, modelovanje bušotine, prenos mase i toplote, taloženje parafina
    ... E. Bobok, Flow and heat transfer in geothermal systems, Chepter 9, Elsevier, str 181-194, (2017) [22] H. Rahnema , J. You, M. McMillan, Numerical modeling of unsteady-state wellbore heat transmission, Journal of natural gas science and engineering, Vol. 34, str 1062- 1076, (2016) [23] Wanqiang ...
    ... [43] J. Faustinelli, D. Doty, Dynamic flow performance modeling of a gas-lift valve, Society of petroleum engineers, SPE Latin American and Caribbean Petroleum Engineering Conference, Buenog Aires, str 1-11, (2001) [44] X. Zhao, J. Xu, Numerical simulation of temperature and pressure distribution ...
    ... precipitation of paraffins begins at greater depths and that the amount of deposit is higher in the gas-lift well. Key words: gas-lift, well modeling, mass and heat transfer, paraffin deposition Scientific area: Mining engineering Scientific subfield: Elements of mechanical and energy systems ...

  • Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation

    Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer (2021)
    kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje
    ... displacements (Lauer et al. 2020), geodetically observed strain rates of glaciers (Lhermitte et al. 2020) or interpretation of 2-D deformation in numerical geodynamic models. 7 C O N C LU S I O N S We have applied methods to update Lagrangian material displacements using incremental, space-based (Eulerian) ...
    ... types of tectonic deformation—extension, shortening and strike-slip—contribute to the cumulative deformation, documented through physical analogue modeling. A PIV-derived classification of the type of strain can so complement visual inspection of the type of faulting (e.g. as in Willingshofer & Sokoutis ...
    ... ns of those. In this paper we will discuss various deformation tensors that are common, infinitesimal strain, or less common in the geophysical modeling literature, finite strain and finite stretch. We will argue which tensors are best suited to describe large deformation and classify deformation ...

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... Appl. Geochem. 17, 517, 2002. 16. GOLDBERG S. Chemical Modeling of Specific Anion Adsorbtion on Oxides, Clay Minerals, and Soils, ENVI- ROSOFT, CML Publications, Ashurst Southampton, U.K. 86, pp. 671-688, 1986. 17. MANNING A.B., GOLDBERG S. Modeling arsenate com- petitive adsorption on kaolinite, mont ...

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    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 ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... 0 0 µE3-SC6 0.74 0.74 0.26 0.26 0.09 0 0 0 0 0 Symmetry 2020, 12, 908 21 of 42 4.2. Fuzzification of Numerical Input Data This subsection summaries information about fuzzification of numerical input data. 4.2.1. Socio-Economic Applicability’s Partial Indicators Analysis In addition to the expert ...
    ... 3385174 3883750 5386354 6265377 t CO2 Emissions NOx 6034 6923 9601 11,168 kg NOx Numerical input data for partial indicator GHG emissions (E1) for all combined scenarios is presented in Table 24. Table 24. Numerical input data for partial indicator GHG emissions (E1). E1 SC 1 SC 2 SC 3 SC 4 SC 5 SC ...
    ... emitted, which was obtained by using the nitrogen oxide emission factor from Table 1. Numerical input data for partial indicator pollutant emissions (E1) for all combined scenarios is shown in Table 26. Table 26. Numerical input data for partial indicator pollutant emissions (E2). E2 SC 1 SC 2 SC 3 SC 4 ...

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... (14) where C, α, β - constants defined by the user, e.g., C = 0.5; α = 1 or 2; β = 1 or 2; t - the generation number. 4. NUMERICAL EXAMPLE Proposed optimisation model based on GA application is tested in design task for development of ore deposit composed of four ore bodies ...
    ... to create a population. They work with chromosome genotype. The population evolves toward the better chromosomes by applying genetic operators modeling the genetic processes occurring in the nature selection, recombination and mutation. Selection compares the chromosomes in the population aiming ...

  • Model inteligentnog sistema adaptivnog upravljanja procesom prerade rude

    Ivana M. Jovanović (2016-01-13)
    U oblasti procesa prerade rude, flotacijska koncentracija predstavlja jednu od najznačajnijih i najčešće primenjivanih metoda separacije korisnih od nekorisnih minerala. Samim tim, veoma je važno osigurati uspešan rad flotacijskog postrojenja kroz dostizanje zadovoljavajućih tehno-ekonomskih pokazatelja. Cilj upravljanja procesom flotacijske koncentracije je upravo optimizacija kvaliteta i iskorišćenja korisne komponente u koncentratu uz maksimizaciju profita. Shodno tome, istraživanja na polju modelovanja i upravljanja ovim procesom zauzimaju značajno mesto u praksi kontolnog inženjenringa.Teorijska istraživanja u okviru doktorske disertacije obuhvatila su analizu položaja ...
    flotacijska koncentracija, modelovanje, upravljanje, inteligentni sistem, soft kompjuting, fazi logika, veštačke neuronske mreže
    ... A., Harris, M.C., 2007. Modeling and simulation of industrial flotation processes. Froth Flotation: A Century of Innovation (Edited by M.C. Fuerstenau, G.J. Jameson, R.H. Yoon), Publisher:SME, pp. 757–777. 101. Herbst J. A., Flintoff B., 2012, Recent Advances in Modeling, Simulation, and Control ...
    ... Massinaei, M., 2014b. Fuzzy-based modeling and control of an industrial flotation column. Chemical Engineering Communications 201 (7) pp. 896–908 119. Jahedsaravani, A., Marhaban, M.H., Massinaei, M., 2016. Application of statistical and intelligent techniques for modeling of metallurgical performance ...
    ... Engineering 23, pp. 968–972 16. Bartolacci, G., Pelletier Jr., P., Tessier Jr., J., Duchesne, C., Bossé, P.-A., Fournier, J., 2006. Application of numerical image analysis to process diagnosis and physical parameter I. Jovanović, MODEL INTELIGENTNOG SISTEMA ADAPTIVNOG UPRAVLJANJA PROCESOM PRERADE RUDE ...

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Exhumation history of the Juhor Mts. in central Serbia, the Northern Serbo–Macedonian Subunit

    Uros Stojadinovic, Hannah Pomella, Nemanja Krstekanić, Bojan Kostić, Maja Maleš, Nikola Randjelovic, Miloš Radonjić (2024)
    Northern Serbo–Macedonian Subunit, low-t thermochronology, kinematic analyses, extensional deformations

  • Modeliranje buke u urbanoj sredini u okolini Doma zdravlja u Pančevu

    Stefan Mandić (2024)
    Prisustvujemo epohi gde buka predstavlja veoma rasprostranjen i moderan fenomen koji možemo deklarisati kao problem. Svedoci smo toga da moderni problemi zahtevaju malo drugačiji pristup nego u prošlosti, odnosno zahtevaju moderna rešenja. Samim tim, vremenom je došlo do modernizacije alata,u ovom slučaju došlo je do razvoja modela za rasprostiranje buke koji su se vremenom unapređivali pa tako danas imamo jedno moćno sredstvo za borbu protiv buke u vidu kompjuterskog softvera.Ovaј master rad, pod nazivom „Modeliranje buke u urbanoj sredini ...
    buka, zvuk, saobraćaj, modeliranje, merenje buke
    ... covers all the necessary steps for the successful creation of a computer model for the purposes of modeling noise propagation in industrial environments. Keywords: Noise, sound, traffic, modeling, noise measurement Modeliranje rasprostranjenosti buke u urbanoj sredini u okolini Doma zdravlja ...
    ... improved over time, so today we have a powerful tool to combat noise in the form of computer software. This master's thesis, entitled "Noise modeling in the urban environment in the vicinity of the Pančevo Health Center" contains 10 chapters, where all the necessary steps, data, methods, as ...
    ... collect the necessary data: measuring noise in the field at the location itself, counting road users, both light and heavy motor vehicles, and finally modeling the spread of the noise impact through computer software. We were able to present three scenarios in order to gain an insight into the real state ...

  • Hydrogeochemistry of Uranium in the Groundwaters of Serbia

    Marina Ćuk, Maja Todorović, Petar Papić, Jovan Kovačević, Zoran Nikić (2015)

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... significant professional contribution. It is reflected in the solving of a number of practical problems in oil production optimization process and the modeling of a new and more efficient oil exploitation technology. Key words: oil, production, optimization, Amal, Libya. Scientific ...
    ... Gas Field Processing, CRC Press. Abdul-Wahab S., Elkamel A., Madhuranthakam C.R., Al-Otaibi M.B. (2006) Building inferential estimators for modeling product quality in a crude oil desalting and dehydration process, Chemical Engineering and Processing: Process Intensification, Volume 45, Issue ...
    ... its damage to fracture sconductivity. Nat. Gas Ind. 28(2), 99–101. Mahdi K., Gheshlaghi R., Zahedi G., Lohi A. (2008) Characterization and modeling of a crude oil desalting plant by a statistically designed approach, Journal of Petroleum Science and Engineering, Volume 61, Issues 2–4, 116- ...

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... significant professional contribution. It is reflected in the solving of a number of practical problems in oil production optimization process and the modeling of a new and more efficient oil exploitation technology. Key words: oil, production, optimization, Amal, Libya. Scientific ...
    ... Gas Field Processing, CRC Press. Abdul-Wahab S., Elkamel A., Madhuranthakam C.R., Al-Otaibi M.B. (2006) Building inferential estimators for modeling product quality in a crude oil desalting and dehydration process, Chemical Engineering and Processing: Process Intensification, Volume 45, Issue ...
    ... its damage to fracture sconductivity. Nat. Gas Ind. 28(2), 99–101. Mahdi K., Gheshlaghi R., Zahedi G., Lohi A. (2008) Characterization and modeling of a crude oil desalting plant by a statistically designed approach, Journal of Petroleum Science and Engineering, Volume 61, Issues 2–4, 116- ...

  • Hibridni sistem za planiranje i analizu ventilacije rudnika

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilacija rudnika, informacioni sistemi
    ... okviru ove knjige za fazu analize razvoja softvera usvojen je UML (Unified Modeling Language) kao standardni jezik za vizuelizaciju, specifikaciju, konstruisanje i dokumentovanje činjenica o softveru. UML (Unified Modeling Language) je jezik za modeliranje sistema koji koristi objektno-orijentisane ...
    ... analizu ventilacije rudnika 8 Kako koristiti elektronsku knjigu? Sadržaj knjige UML notacija Index About the book UML UNIFIED MODELING LANGUAGE UML (Unified Modeling Language) je stadardni jezik za specifikaciju, vizuelizaciju i dokumentaciju činjenica vezanih za softverski sistem. Korišćenjem ...
    ... Defining Aerodynamic Resistance Distribution in Ventilation Networks Modeling and Development of a Software Package for Defining Aerodynamic Resistance Distribution in Complex Mine Ventilation Networks…………………...130 CHAPTER 5 MODELING OF AIR FLOW DISTRIBUTION Air Flow Distribution………………………………………………………………… ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... er) and multimedia. A small dynamic map of the surrounding area of the selected mine site with a zoom in possibility is shown with textual and numerical data. Further possibilities for data management and analysis are accessible only for authorized users, who can login in the site home page to proceed ...
    ... and to ensure that full synergies are achieved. 4. Materials and Methods 4.1. Geodatabase Model The geodatabase model was developed using Unified Modeling Language (UML) and Computer-Aided Software Engineering (CASE) tool Microsoft Visio (Microsoft Corporation: Redmond, WA, USA), which has a developed ...
    ... Information Systems KML Keyhole Markup Language WMS Web Map Service WFS Web Feature Service CASE Computer-Aided Software Engineering UML Unified Modeling Language References 1. Hall, A.; Scott, J.A.; Shang, H. Geothermal energy recovery from underground mines. Renew. Sustain. Energy Rev. 2011, 15 ...

  • Open Educational Resources in Serbia

    Ivan Obradović, Ranka Stanković, Marija Blagojević, Danijela Milošević (2020)
    Open educational resources, BAEKTEL, Metadata portal
    ... portal content by type Topics of content (titles and keywords) are visualised by a word cloud in Figure 3. It can be seen that computer science, modeling and language technologies are dominant. 12 Chapter # - will be assigend by editors Figure ...
    ... received MSc and PhD degrees at the University of Belgrade. Her expertise includes distance learning, intelligent tutoring systems, adaptive user modeling and Semantic Web. She teaches traditional, online and blended IT courses. She was coordinator of the regional Tempus project DL@WEB for improving ...

  • Opremanje bušotine X zavojnom pumpom

    Milan Filipović (2024)
    Ovaj rad se bavi osnovnim pojmovima i karakteristikama zavojnih pumpi.Prikazan je sklop zavojnih pumpi i njena prateća oprema. Objašnjen je princip rada zavojnih pumpi kao i uloga svakog mašinskog elementa koji se nalazi u pumpi. Razmotrene su prednosti i nedostaci primene ovih primarnih mehaničkih metoda eksploatacije ugljovodonika. Dat je uvid u inovativna rešenja problematike primene zavojnih pumpi. Na konkretnom primeru bušotine X su prikazani problemi kao i rešenja primene ovih primarnih mehaničkih metoda u praksi. Napravljena je detaljna analiza ...
    zavojne pumpe, oprema, primarne mehaničke metode, ugljovodonici, analiza rada
    ... y-pump-design-makes-maintenance-a-breeze • Zhu,J. & Zhang H.Q. (2018). "A Review of Experiments and Modeling of Gas&Liquid Flow in Electrical Submersible Pumps", project: Mechanistic modeling in Electrical Submersible Pumps (ESP) Soleša, M., Danilović, D., Buza, Z. (1999). "Sistem analiza p ...

  • Mogućnost infracrvene termografije pri detekciji štetnih gasova

    Stevan Đenadić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2021)
    Curenje pojedinih gasova je opasnost koja može da izazove velike nezgode. Često je praćeno požarima i eksplozijama koji za posledicu mogu da imaju kako ljudske povrede, tako i štetan uticaj na ekologiju i ekonomiju. Da bi se izbegle takve situacije, preventivna inspekcija je od presudne važnosti. Curenje većine gasova se ne može uočiti golim okom a za otkrivanje i procenu stepena curenja može se koristiti tehnologija toplotnog snimanja (infracrvena termografija). U datom radu predstavljene su mogućnosti i ograničenja primene ...
    IC termografija, curenje gasa, termogram

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... training: ground for experimental analysis of the choice of the type of reclamation and the appropriate arrangement of the landscape. Such process modeling of the unified reclamation system foresees a total of 10 alternative possibilities for designing reclamation contents and arranging the post-exploitation ...