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174 items

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    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 Injection

  • Stepen metamorfizma metaklastita rudnika

    Vanja Ćuk (2024)
    Zadatak ovog rada je bio, potvrda saznanja da se na planini Rudnik dogodio kontaktni metamorfizam gornjokrednih sedimentnih stena i da se ispita intenzitet kontakto-metamorfnih promena. Posle kraćeg opisa geografskog položaja, pregleda ranijih istraživanja i geologije šireg područja, usmerena je pažnja na petrološka ispitivanja metaklastita i na kontaktno-metamorfne facije. Usled stvaranja različitih vulkanogenih facija odnosno usled vulkanskih erupcija, delovanjem zagrejane magme (lave) ili zagrejanih fluida, došlo je do kontaktnog metamorfizma, na granici oligocen-miocen i do stvaranja različitih metamorfnih stena, a ...
    Kontaktni metamorfizam, Rudnik, metakonglomerati, metapeščari, metaalveroliti

  • 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
    ... Pty Ltd; D. Basima, Ministry of Energy and Milerals Development of Uganda, "First Application of Progressive Cavity Pumps for Appraisal Well Testing in the Ugandan Albertine Graben Basnin", San Antonio, Texas, 2012 • Heriot-Watt Manual, Heriot-Watt University, "Production Technology 2", Morikawa ...

  • 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

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... of climate change. CO- emissions is a major cause of climate change. With the carbon cycle, humans and animals exhale CO» and inhale oxygen. Also, green plants absorb CO-» for photosynthesis and emit oxygen back into the atmosphere. CO» is used for many purposes such as preserving food and filling ...
    ... the carbon for other purposes such as enhanced oil recovery and chemical production. Industrial CCUS plants mitigate global warming by reducing Green House Gases emissions in the atmosphere though they have been challenges in implementing CCUS on a large scale due to financial and technical issues ...
    ... underground, thus effectively decreasing emissions in the atmosphere. Energy players and government are paying more attention to the development of green and clean energy aimed at saving energy and reducing the emissions of greenhouse gases for financial benefits. Many countries are and energy players ...

  • A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice

    Nikola Lilić, Ivan Obradović, Ranka Stanković (2002)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...
    ... developed enable a dynamic communication between different phases of the outlined approach. This yields practically unlim- ited possibilities for the testing of different modifications of the system until a final solution is reached, which will satisfy all the criteria that were set. 3. Software Implementation ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... phy­3rd­suppl­to­2nd­ed­pdf.pdf (last accessed June 4, 2018). INTERNATIONAL STANDARD ORGANIZATION (ISO) 1171 (1997): Methods for analysis and testing of coal and coke. Determination of ash content.– Internation­ al Organization for Standardization, Switzerland (10 p). INTERNATIONAL STANDARD OR ...
    ... Institute for Standardization of Serbia, Belgrade, Serbia, 5 p. (in Serbian). SRPS ISO/IEC 17025:2006 (2006): General requirements for the competence of testing and calibration laboratories.– Institute for Standardization of Serbia, Belgrade, Serbia, 59 p. (in Serbian). STEVANOVIĆ, P. (1951): Pontische Stufe ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    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
    ... Strategic Environmental Assessment. J. Environ. Assess. Policy Manag. 2001, 3, 305–327. 5. Nilssona, M.; Björklund, A.; Finnveden, G.; Johansson, J. Testing an SEA methodology for the energy sector: A waste incinera- tion tax proposal. Environ. Impact Assess. Rev. 2005, 25, 1–32. 6. Maričić, T.; Josimović ...

  • Efikasnost različitih tipova glina Srbije za adsorpciju metilen plavog

    Maja D. Milošević (2016-12-09)
    Adsorpciona efikasnost različitih uzoraka glina sa lokaliteta Srbije određenaje njihovim tretiranjem različitim koncentracijama rastvora metilen plavog (MP).Detaljna mineraloška karakterizacija ispitivanih glina i rezultati njihove interakcijesa rastvorima MP dobijeni su primenom optičkih, rendgenskih, hemijskih, DTA ispektroskopskih metoda.Na osnovu formiranja MP agregata u izmenljivim pozicijama i površiničestica gline, razlikuju se dva tipa glinovitih minerala: visoko naelektrisani(smektiti) i nisko naelektrisani (kaoliniti). Dimeri se stvaraju na naelektrisanimpovršinama, a granica njihovog razvoja omogućuje determinaciju mineralne vrste.Molekuli MP stoje pod uglom od 21.5o kada se ...
    minerali glina, metilen plavo, kristali metilen plavog, difuznarefleksija, adsorpcija, flokulacija, naelektrisanje slojeva
    ... A. 1992. Testing a simple methylene blue method for surface area estimation in soils. Agrochimica 36(3): 224 - 232 ASTM. 1984. Standard test method for methylene blue index of clay (C 837- 99). In: 1984 Annual Book of ASTM Standards, sect. 15, vol. 15.02. American Society for Testing and Materials ...
    ... suspension. Determination of the layer change is possible by observing the color changes after MB saturation. Color is changing from saturated blue to green (smectite) or it remains blue, followed by changes in saturation (kaolinite). By adjusting grain size, zeta potential and pH of the suspension it ...
    ... Physical Chemistry 95: 6984 - 6990 Hotta Y., Banno T., Nomura Y., Sano S. and Oda K. 1999. Factors affecting the plasticity of Georgia Kaolin Green Body. J. Ceramic Soc. of Japan 107: 868 - 871 Imai G. 1980. Settling behavior of Clay Suspension. Soils and Foundations 20: 61 - 77 Imamura K ...

  • Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad)

    Vladimir Kovačević (2024)
    Za potrebe izrade završnog rada na četvrtoj godini Rudarsko-geološkog fakulteta, studijskog programa Geotehnika, pod mentorstvom doc. dr Zorana Berisavljevića, odabrana je tema „Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad)“. Osnovni metodološki pristup koji je korišćen za rešavanje postavljenog problema predstavlja kabinetsko istraživanje dostupne dokumentacije, analiza i interpretacija rezultata izvedenih geoloških,geotehničkih i geomehaničkih istraživanja. Predstavljene su osnovne informacije,karakteristike i upotreba prednapregnutih geotehničkih sidara.Analiziran je tok testiranja granične nosivosti prednapregnutih sidara. Na osnovu izvršenih geotehničkih istraživanja terena i ispitivanja ...
    geotehnička istraživanja, prednapregnuta sidra, nosivost sidra, standard SIA V 191
    ... Hoek-ovoj ćeliji 1/5 Opit Jednoaksijalne čvrstoće na pritisak 272 ISRM. (2007) The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974—2006. In: Ulusay, R., Hudson, J.A. (eds) 19 4.3. Interpretacija testa vodopropusnosti pod pritiskom (Lugeon-ova ili ...
    ... skupljanje (u plastičnoj fazi i u fazi očvršćavanja) • Ne izaziva koroziju • A1 klasa zapaljivosti ODOBRENJA / STANDARDI • Technical and testing building institute Prague (TZUS) - 1020- CPR -020032279 • CE Marking and Declaration of Performance to EN 1504-3 - Products and systems for the ...

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

  • Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study

    Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)
    Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...
    Pharmaceutical Science
    ... decreased to below 80%, indicating insufficient sucrose concentration. This was considered unacceptable and this combination was excluded from further testing. Although isotonic preparations are preferable, hypertonic formulations are acceptable for parenteral administration, especially if the stability ...

  • Named Entity Recognition for Distant Reading in ELTeC

    Francesca Frontini, Carmen Brando, Joanna Byszuk, Ioana Galleron, Diana Santos, Ranka Stanković (2020)
    Akcija COST „Udaljeno čitanje za evropsku književnu istoriju“, koja je počela 2017. godine, ima među svojim glavnim ciljevima stvaranje višejezične zbirke evropskih književnih tekstova (ELTeC) otvorenog koda. U ovom radu predstavljamo rad koji je obavljen na ručnom označavanju selekcije ELTeC kolekcije za imenovane entitete, kao i na proceni postojećih alata za prepoznavanje imenovanih entiteta u pogledu njihove sposobnosti da automatski urade takve anotacije. U poslednjem paragrafu se razmatraju zajedničke tačke između ove inicijative i CLARIN-a.
    ... c e . T h e re s u l ts o f th e la te s t ro u n d o f a n n o ta tio n s (M a y 2 0 1 9 ) a re p re s e n te d in T a b le 1. 2.3 Testing automatic NER A n o th e r im p o r ta n t a c tiv i ty o f W G 2 is te s t in g e x is t in g to o ls to a s s e s s th e ir c a p a ...

  • 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
    ... with right Cauchy—Green deformation tensor C and left Cauchy—Green deformation tensor B. The components of finite strain tensors E and E* read (Malvern 1969): 1 (du; Ou; dug Oux Ej; = x d — 25 / (het ant oe ie) (25) 1 (du; du; du, d Bea (44 eee (26) J 2 Ox; OX; OX; Ox; The Lagrange—Green strain tensor ...
    ... displacements (green arrows) on an initial material grid (black), representing virtual material points, at the first epoch. Middle panel: PIV-derived Eulerian displacements (black arrows) and initial grid (black) and interpolated displacements on the deformed material grid (green) at the second epoch ...
    ... (2011). For large strains it matters whether the strain is described with respect to the undeformed state E—Lagrange–Green strain tensor—or, with respect to the deformed state E∗ —Almansi–Green strain tensor: E = 1 2 ( FT F − I ) = 1 2 ( C − I ) (23) D o w n lo a d e d fro m h ttp s ://a ...

  • Specifičnosti izgradnje deonice 3 brze saobraćajnice Požarevac-Golubac na organskom tlu

    Vojislav Lučić (2024)
    U ovom završnom radu prikazani su podaci koji se odnose na metode ojačanja terena izgrađenog od slabonosivog organskog tla, kao i njegove geotehničke karakteristike na primeru šireg istražnog prostora, u okolini sela Kumane duž trase treće dionice brze saobraćajnice Požarevac-Golubac. U radu su prvo prikazane osnovne karakteristike i podele organskog tla i treseta, zatim su navedene metode ojačanja tla koje mogu da se koriste na datom istražnom prostoru i na kraju je izvršena analiza i interpretacija rezultata geotehničkih istraživanja ...
    organsko tlo, treset, metode ojačanja slabonosivog tla, slieganje, konsolidacija i vremenski tok konsolidacije
    ... poglavlje 10; ~ R ——r O —T! Gniel J. i Bouazza A., Construction of geogrid encased stone columns: A new proposal based on laboratory testing, februar 2010, Volume 28, pages 108- 118, https://doi.org/10.1016/j.geotexmem.2009.12.012; 7. Hadži-Niković G., Geostatički proračuni, Univerzitet ...

  • 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
    ... Rock-Eval et ses applications. Deuxième partie. Rev. Inst. Français Pétrole 1985, 40, 755–784. [CrossRef] 49. ISO 1171. Methods for Analysis and Testing of Coal and Coke. In Determination of Ash Content; International Organization for Standardization: Geneva, Switzerland, 1997; p. 10. 50. Sun, Y.H ...

  • Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike

    Milanka N. Negovanović (2015-06-30)
    Modeliranje predviđanja potresa tla od miniranja primenom fazi logike i metode MonteKarlo zasnovano je na podacima dobijenim terenskim merenjima potresa uzrokovanihminiranjem. Promenljive modela definisane su analizom parametara bušenja i miniranjaminskih serija, kao i velosigrama izmerenih potresa od miniranja. Iskorišćene suprednosti fazi logike u implementaciji mnogo većeg broja ulaznih i izlaznih veličina zamodeliranje u odnosu na postojeće empirijske modele. Na osnovu identičnih podataka,dobijen je regresioni model predviđanja potresa, da bi se izvršilo testiranje novogmodela. U cilju povećanja pouzdanosti modela predviđanja, ...
    model, predviđanje potresa, miniranje, površinski kop, Monte Karlo, fazilogika, regresiona analiza, FFT analiza, spektri odziva, pomeraj pukotina
    ... the existing empirical models are apllied. The regression model for the prediction of vibrations is obtained on the basis of identical data for testing the new model. In order to increase the reliability of prediction model, the analysis of measured vibration characteristics according to existing ...
    ... registered on November 3rd 2010. with its epicenter in Kraljevo, which enabled the analysis of vibration time histories induced by earthquake. Testing the model revealed the high reliability of prediction in relation to existing regression model. Taking into account the complexity of prediction ...
    ... 64. Dowding, C.H., Beck, W.K., Atmatzidis, D.K., Blast Vibration Implications of Cyclic Shear Behavior of Model Plaster Panels, ASTM Geotechnical Testing Journal, Vol. 3, No. 2, 1980, 81-90. 65. Medearis, K., The Development of Rational Damage Criteria for Low-Rise Structures Subjected to Blasting ...

  • Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike

    Milanka N. Negovanović (2015-06-30)
    Modeliranje predviđanja potresa tla od miniranja primenom fazi logike i metode MonteKarlo zasnovano je na podacima dobijenim terenskim merenjima potresa uzrokovanihminiranjem. Promenljive modela definisane su analizom parametara bušenja i miniranjaminskih serija, kao i velosigrama izmerenih potresa od miniranja. Iskorišćene suprednosti fazi logike u implementaciji mnogo većeg broja ulaznih i izlaznih veličina zamodeliranje u odnosu na postojeće empirijske modele. Na osnovu identičnih podataka,dobijen je regresioni model predviđanja potresa, da bi se izvršilo testiranje novogmodela. U cilju povećanja pouzdanosti modela predviđanja, ...
    model, predviđanje potresa, miniranje, površinski kop, Monte Karlo, fazilogika, regresiona analiza, FFT analiza, spektri odziva, pomeraj pukotina
    ... the existing empirical models are apllied. The regression model for the prediction of vibrations is obtained on the basis of identical data for testing the new model. In order to increase the reliability of prediction model, the analysis of measured vibration characteristics according to existing ...
    ... registered on November 3rd 2010. with its epicenter in Kraljevo, which enabled the analysis of vibration time histories induced by earthquake. Testing the model revealed the high reliability of prediction in relation to existing regression model. Taking into account the complexity of prediction ...
    ... 64. Dowding, C.H., Beck, W.K., Atmatzidis, D.K., Blast Vibration Implications of Cyclic Shear Behavior of Model Plaster Panels, ASTM Geotechnical Testing Journal, Vol. 3, No. 2, 1980, 81-90. 65. Medearis, K., The Development of Rational Damage Criteria for Low-Rise Structures Subjected to Blasting ...

  • Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova

    Zoran M. Štirbanović (2015-07-01)
    Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...
    rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina
    ... primenjujući teoriju grubih skupova. Bai i Sarkis [53] su koristeći teoriju grubih skupova izvršili analitičku procenu razvoja „zelenih“ dobavljača (Green supplier development). Yan et al [54] su pomoću teorije grubih skupova izvršili mapiranje glečera kao jednog od bioindikatora globalnog zagrevanja ...
    ... potentialities using a Dominance-based Rough Set Approach, Journal of Environmental Management 144, 2014, pp. 160-167. 53. C. Bai, J. Sarkis, Green supplier development: analytical evaluation using rough set theory, Journal of Cleaner Production 1, 2010, pp. 1200–1210. 54. L. Yan, J. Wang, X ...
    ... point of a doctoral dissertation, examining the possibilities of its application in mining. In the experimental part of the dissertation was done testing the possibilities for application of rough set theory to solve three problems: choosing location for the flotation tailings landfill, choosing flotation ...