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Упит dcterms_creator_txt:Goran H. MARINKOVIĆ

736 items

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... Fbc JicJTa, H npepajie, ako ce HaBeJIe Me ayTOpa Ha HauHH OnpebeH 0J1 crpaHe ayropa HJm maBaona JIHHCHIIC, daK H y KOMepHHjaJIHe cBpXe. OBo je Hajcno60/iHHja OJI CBHX nHILeHHMH. 2. | AyropcrBo — HeKOMEpIHUjajIHO. J[03B0JbaBaTe yMHO)KaBaMbe, JCTpHOyIHjy H jaBHO caonurraBahbeć ema, H mpepajie, aKO ...
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    ... ILCH1IC, OBOM JIHIIČHIIOM Ce OTpaHHuaBa HajBehu OGHM (ČIHTH NOJL HCTHM ycno0BHMa. IlmBOMBaTC caonmrraBalbc JIena, H npcpajc, aKO Cc HaBeMe aHe ayTOpa HH NaBaOHa JIHHCHHC M aKO CC H CHHUHOM JHMHHCHHOM. OBa nHMHeHma He cpana. 55 BuGanoreka Pygapeko-reonoukor dakyatera im x Tlors phyje ce aje ...

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... abundant diterpenoid in aliphatic fraction of Lower Miocene lignites is 16α(H)-phyllocladane, whereas in Middle Miocene samples it is isopimarane or norabietane. The hopanoid distributions of all samples dominated by C3117(H)21(H)22(R)-hopane, but Lower- and Middle Miocene lignites notably differ according ...

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... of degradation and to display their change, if the initial conditions are known. beforc h·odcgrudaum'\ , iibeć- air (a) h, biodegradation Ž::·'l AhA FB, w water(v) h, j air(a) f water (v) Fig. 3. Phase system change of municipal waste during, iodegradation (Gourc and Staub, 2010). Values ...
    ... physical parameters in a certain stage of biodegradation are determined according to the following expressions: |. O ı_M H[l Ah (1—"0)F n=m An—n„—To Q) 1_Z H() w=w, — 4 G) m where: mx, mya — initial dry mass and mass of drained water Žuo, }a — Initial dry unit weight and dry unit ...
    ... @523331 the phase composition and physical indicators of iušLte008| Y Horanalysis| municipal waste. In addition, physical properties of •n žž% M:s| ; H n pj ii r waste change over time, both in depth and from · · O waste- location to location, so the method of taking and O selection of representative ...

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • Geostatički proračuni sanacije klizišta šipovima

    Slobodan Ćorić, Dragoslav Rakić, Dušan Berisavljević (2019)
    U ovom radu su, polazeći od rezultata geotehničkih istraživanja, prikazani geostatički proračuni sanacije klizišta vertikalnim šipovima. Metodologija proračuna je složena, jer podrazumeva interakciju klizišta i stabilizirajućih šipova. Stoga se simultano analiziraju stabilnost klizišta i stabilnost šipova. Prilikom određivanja bočne otpornosti tla oko šipova koristi se metoda Brinč Hansena koja uzima u obzir trodimenzionalne uslove u tlu i može da se primeni u složenim geološkim uslovima koji su česti u Srbiji. Analize stabilnosti klizišta vrše se odgovarajućim metodama granične ravnoteže. ...
    sanacija klizišta, interakcija klizišta i šipa, bočna otpornost šipova, stabilnost klizišta i šipova
    ... 4, 1975., pp. 43-59. -18, Tuzla, 2000. NAVFAC, Design Manual DM -7.1., Soil mechanics, Department of the Navy, Alexandria, 1982. Poulos, H. G. and Davis, E. H.: Pile foundation analysis and design, John Wiley & Sons, New York, 1980. Tomlinson, M. J.: Foundation design and construction, The Pitman ...
    ... Tomlinson, 1980) Hansen, 1961) je 1). Figure 1. Brinch Hansen’s method 295 Ома metoda зе одло05! па krute vertikalne Чроуе koji, род dejstvom sile H, гобтаји oko tačke O. Veličina bočnih pritisaka от, koja uzima и obzir trodimenzionalne uslove u kojima se šip nalazi i koja predstavlja razliku bočnih ...
    ... = 1.2 – 1.5, zemljotresa Fs = 1.1. horizontalne sile Hp šip u kliznom telu (Slika 6). Figure 6. Calculation of pile stability 298 1 2 pF - F = H (2) 1 1 2 2F e = F e (3) o 0 površine Lb Navfac, 1982; Poulos et al., 1980 u silu Hp šipu, a zatim da se izvrši dimenzionisanje šipa. U vezi sa tim ...

  • 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
    ... well-rocking/ [11] H. Winkler, S. Smith, Camco gas-lift manual, Camco Inc, Houston, str 20-140, (1962) [12] A. Hasan, C. Kabir, Fluid flow and heat transfer in wellbores, Second edition, Society of Petroleum Engineers, str 23-46, 85-192, (2002) [13] M. Schlumberger, H. Doll, A. Perebinossoff ...
    ... Chemical Engineering Science, Vol. 49, str 2163-2172, (1994) [67] H. Mukherjee, J. Brill, Pressure drop correlations for inclined two-phase flow, Journal of Energy Resources Technology, Vol. 107, str 549-554, (1985) [68] H. Mukherjee, J. Brill, Liquid holdup correlations for inclined two-phase ...
    ... Viscosity of liquids, Springer, (2006) [75] H. Zhang, Q. Wang, C. Sarica, J. Brill, Unified model for gas - liquid pipe flow via slug dynamics-part 1: model development, Journal of Energy Resources Technology, Vol. 125, str 266-273, (2003) [76] H. Zhang, Q. Wang, C. Sarica, J. Brill, Unified ...

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • 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
    ... molekulski agregati će apsorbovati svetlost i na višim i na nižim talasnim dužinama pa samim tim imaju osobine i H i J agregata (Czimerova et al., 2004). Da bi postojali H dimeri ili veći H agregati potrebno je imati veoma kratko rastojanje između susednih negativnih naelektrisanja. Zapažena su znatna ...
    ... apsorbovanih katjona sa drugim katjonima iz rastvora. Osnovni katjoni koji se nalaze u pozicijama za izmenu su Ca2+, Mg2+, Na+, K+, Li+ i H+. Na niskim pH vrednostima H+ zamenjuje druge katjone. Redosled katjonske izmene zavisi od naelektrisanja i jonskog radijusa katjona i na toj osnovi može se predstaviti ...
    ... njihova apsorpcija svetlosti se odigrava na nižim energetskim nivoima tj. na dužim talasnim dužinama u odnosu na H - agregate (Bujdak et al., 2002). Slika 10. Šema strukturnog modela H – agregata (a), J – agregata (b) i dimera formiranih na površini gline (c) (Bujdak and Iyi, 2002) Na agregaciju ...

  • Influence of Ag doping on the morphological and magnetic properties in CuO nanopowders

    Maria Čebela, Uroš Čakar, Vesna Lojpur, Maja Milošević, Sanja Krstić, Vladimir Dodevski, Milena Rosić (2023)
    ... Technology, University of Novi Sad, Serbia Dr. Zorica Branković, Institute for Multidisciplinary Research, University of Belgrade, Serbia Dr. Goran Branković, Institute for Multidisciplinary Research, University of Belgrade, Serbia Dr. Zorana Dohčević-Mitrović, Institute of Physics, University ...
    ... 7 Conference of The Serbian Society for Ceramic Materials SPECIAL THANKS TO Penyoannka Cpouja MIHHIICTAPCTBO HAYKE, TEXHO.TOIIIKOI PA3BOJA H HHOBAIIHJA NATIONAL TOURISM ORGANISATION of SERBIA Turistička organizacija [Q, Beograda 7 Conference of The Serbian Society for Ceramic ...
    ... temperature, during which a successful reaction between metal nitrate and sodium hydroxide occurred. Prepared powders were calcinated at 700 "C for 2 h. The diffraction pattern was recorded at room temperature and atmospheric pressure without of any re-heating of the sample. The Rietveld method for ...

  • Mikrobiološki diverzitet kiselog jezera Robule i uticaj jezerske vode na oksidaciju sulfidnih minerala

    Srđan B. Stanković (2016-09-11)
    Jezero Robule, formirano u podnožju rudničke raskrivke Oštreljski planir (Rudnik bakra Bor), je nastalo kao posledica rudarskih aktivnosti. Mikrobiološki diverzitet ekstremno kiselog jezera Robule ispitivan je primenom kako klasičnih mikrobioloških metoda (svetlosna mikroskopija i kultivacija na selektivnim podlogama) tako i primenom savremene metode molekularne biologije (analiza polimorfizama terminalnih restrikcionih fragmenata; T-RFLP). Takođe, ispitivan je i potencijal i efikasnost jezerske vode u biološkom luženju mineralnog koncentrata, kao i u bioluženju uzoraka stare flotacijske jalovine Rudnika bakra Bor.Na osnovu dobijenih rezultata ...
    jezero Robule, acidofilne bakterije, bioluženje, kisele rudničke vode, flotacijska jalovina
    ... of the microbiological popualtions of mine wastes, PhD thesis, University of Wales, United Kingdom 16. Bugarin M., Stevanović Z., Gardić V., Marinković V. (2012) Pregled dosadašnjih geoloških istraživanja starog flotacijskog jalovišta i EU regulativa iz oblasti zaštite voda, Rudarski radovi 4: ...
    ... minerala polisulfidnim mehanizmom se može prikazati sledećim hemijskim reakcijama (Vera et al., 2013): MS + H+ → M2+ + 0,5H2Sn (n ≥ 2) (7) 0,5H2Sn + Fe3+ → 0,125S8 + Fe2+ + H+ (8) 0,125S8 + 1,5O2 + H2O → SO4 2- + 2H+ (bakterijski metabolizam) (9) Polisulfidni mehanizam ...
    ... elektrona vodi ka redukciji NAD+ u NADH + H+ koji je nepohodan kao donor elektrona tokom procesa fiksacije CO2 u Kalvinovom ciklusu. Pošto je oksido-redukcioni potencijal redoks para Fe2+/Fe3+ znatno pozitivniji u odnosu na redoks potencijal para NAD+/NADH + H+ koji iznosi -320 mV, acidofilne bakterije ...

  • Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event

    Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco (2023)
    Brachiopods, taxonomy, biostratigraphy, early Toarcian Anoxic Event, Bulgaria

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... Marine and Petroleum Geology, 59: 22–34. Hrvatović, H., 2006. Geological Guidebook trough Bosnia and Herzegovina. Geological Survey of Federation Bosnia and Herzegovina, Sarajevo, 172 pp. Hunt, J. M., 1996. Petroleum Geochemistry and Geology. W. H. Freeman and Company, New York, 743 pp. Hutton, A ...
    ... Marine and Petroleum Geology, 59: 22-34. Hrvatovic, H., 2006. Geological Guidebook trough Bosnia and Herzegovina. Geological Survey of Federation Bosnia and Herzegovina, Sarajevo, 172 pp. Hunt, J. M., 1996. Petroleum Geochemistry and Geology. W. H. Freeman and Company, New York, 743 pp. Hutton, A. ...
    ... I., Pocock, S. A. J., van Gijzel, P., Welte, D. H. & Yukler M. A. (eds), How to Assess Maturation and Paleotemperature, SEPM Short Course 7. Society for Sedimentary Geology, Tulsa, Oklahoma, pp. 159–216. Van Unen, M., Matenco, L., Nader, F. H., Darnault, R., Mandic, O. & Demir, V., 2019. Kinematics ...

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... Department of Biochemistry and Environmental Chemistry, The John Paul II Catholic, University of Lublin, Konstantynów 1 I, 20-708 Lublin, Poland H I G H L I G H T S • The GWP of the gases released by xylitic lignite was the lowest among the sam- ples. • Extraction of the detritic lignite may re- duce ...
    ... abbreviations as in Table 1. K B R V LN -W 1 V LN -W 2 K N N -W 1 K N N -W 2 TC B - W 1 TC B - W 2 B C B - W 1 B C B - W 2 H C 4 H C l o m n ( n oitc u d or p 4 ss a m yr d g 1- y a d 1- ) 0.0 0.2 0.4 0.6 60.0 80.0 100.0 120.0 K B R V LN -W 1 V LN -W 2 K ...
    ... G.P., Prigent, C., Prinn, R., Ramonet, M., Regnier, P., Riley, W.J., Rosentreter, J.A., Segers, A., Simpson, I.J., Shi, H., Smith, S.J., Paul Steele, L., Thornton, B.F., Tian, H., Tohjima, Y., Tubiello, F.N., Tsuruta, A., Viovy, N., Voulgarakis, A., Weber, T.S., Van Weele, M., Van Der Werf, G.R., Weiss ...

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • Аnaliza mogućnosti povećanja nagiba završne kosine površinskog kopa “Podbraćan”

    Vladimir Čebašek, Veljko Rupar (2018)
    Eksploatacijom boksita iz ležišta "Podbraćan" formiran je površinski kop sa maksimalnom visinom zavšne kosine od 280 m. Redovnom kontrolom stabilnosti trenutnog stanja kosina površinskog kopa utvrđeno je da faktor sigurnosti iznosi Fs = 1.71 – 1.85, a što je ukazalo da postoji mogućnost povećanja nagiba kosine. U radu je prikazan postupak analize mogućnosti povećanja nagiba završne kosine površinskog kopa "Podbraćan".
    stabilnost kosina, povećanje nagiba kosina, metoda konačnih elemenata

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... отеженом тек негде после педесете итерације, са  дистрибуцијом протока: Q1=913,72 m 3/h, Q2=1086,28 m 3/h, Q3=82,01 m 3/h, Q4=804,27 m 3/h,  Q5=‐137,86 m 3/h, Q6=251,58 m 3/h, Q7=633,60 m 3/h, Q8=448,42 m 3/h.  Знак  минус  (‐)  испред  бројчане вредности крајњег протока у цеви 5 значи да је см ...
    ... ом тек негде  после педесете итерације,  са дистрибуцијом протока: Q1=902,27 m 3 /h, Q2=1097,73m 3 /h, Q3=94,86m 3 /h, Q4=802,87 m 3 /h,  Q5=‐146,23m 3 /h, Q6=248,50 m 3 /h, Q7=643,36 m 3 /h, Q8=451,50 m 3 /h. Последње  три итерације  се овде не приказују  као у  случају  прорачуна  гасоводне мреже ...
    ... супротним  знаком,  од  добијеног  формулом ∆=F(Q)/|F’(Q)|.  Добијени  протоци  су  након  7  итерација:  Q1=171,65 m 3 /h,  Q2=371,65 m 3 /h,  Q3=‐28,34 m 3 /h  и  Q4=‐128,34 m 3 /h.  Након  седме  итерације разлика квадрата почетног и крајњег притиска је само ‐2,4 Pa, Чиме је задовољен и други Ки ...