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Упит dcterms_subject_txt:phase composition

312 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
    ... and a square section for gripping with wrenches during installation and removal [3.,8]. The chemical composition of the steel used for making sucker rods varies. Based on the steel composition, pumping rods are generally classified into tvo groups: carbon– manganese and nickel-molybdenum groups ...
    ... traveling valve opens, and the plunger moves downward through the fluid inside the pump cylinder. This part is known as the pump system'"s discharge phase, during which the pressure inside the cylinder remains constant and is equal to the sum of the discharge pressure and the pressure needed to move ...
    ... fuel for these engines can be dry and wet gas, liquefied gas, gasoline, and diesel fuels. Where electrical power is available, asynchronous three-phase electric motors are most commonly used, specifically with 28 a squirrel-cage rotor. They typically operate at a voltage of 380 V with three phases ...

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... Pseu- dosubplanites as one of the starting elements of the newly emerging, family Neocomitidae. This concept is also accepted here. Species composition and their detailed characterisation have been recently mainly addressed by Arkadiev and Bogdanova (2012) and Hoedemaeker et al. (2016). The latter ...
    ... sequence is topped by the Grandis Zone. The following succession characterises the studied section, Ded- ina, in terms of ammonite species composition. At the beginning of the section,in itslowest part, there is a single specimen of Hegaratella oxycostata. The first 12 following layers contain ...
    ... 'Z EC 9S OI (E CO Z) IS I lU O4 DO SO y Sn O0 0D lO RD Z. Vašiček, D. Rabrenović, P. Skupien et al. the genera and species composition of ammonites, the association described here appears to be close to the ammonite association in Crimea. 7. Conclusion According, to a preliminary ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... The materials will be supported by electronic terminological resources, as well as services, and search and browse functionalities. Given the composition of the project partners the platform will be initially populated by materials from the domains of ICT, geoinformatics, mining and environmental ...
    ... thus provide educational support for a variety of users at different levels, offering an educational continuum. It will even support the initial phase © Institute of Knowledge Asset Management - ISBN 978-88-96687-04-8 Proceedings of IFKAD - ISSN 2280-787X Matera, Italy, 11-13 June 2014 www ...

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... sulfate dihy- drate is the principal phase present in raw phosphogypsum sam- ples, which is formed according to the chemical reaction in Eq. (6): Cayjo(POx);F+ + 10H>SOa + 20H,O — 10CaSOu · 2H,O + 6H5PO, + 2HF (6) Quartz is the predominant Si-bearing phase, originating from the parent phosphate ...
    ... Digestion System (ETHOS 1, Milestone, Italy) using an HPR-1000/10S high-pressure segmented rotor. X-ray diffraction measurements Mineralogical composition was determined using a Philips PW 1710 automated diffractometer, using: Cu-Ko: radiation (, = 1.54184 A) on randomly oriented powders in the range ...
    ... samples. The samples were dried at 50% for 48h and sieved through a 2mm sieve. These raw samples, labelled as PGI and PG2, were subjected to chemical, phase and morphological characterization, as well as activity concen- tration determination. Sample PG1, due to its higher activity concentration of ...

  • Петрологија црвених пешчара источне Србијe

    Андреј Марковић (2024)
    У источној Србији формација црвених пешчара има велико распрострањење и улази у састав многих планина овог дела наше земље. Формацију чине кластичне стене интензивно црвене боје псамитске, ређе псамитско-псефитске структуре и алевритске структуре. Ове стене леже трансгресивно преко старијих пермо-карбонских и карбонских стена, док навише прелазе у доњотријаске седименте. Формација црвених пешчара захвата два појаса унутар Карпато-балканида – унутрашњи и средишњи део. Узорци анализирани у овом раду део су средишњег појаса. Тема завршног рада је петрологија црвених пешчара источне ...
    источна Србија, црвени пешчар, петролошко-минералошке карактеристике, аркозе
    ... nempojouwko-MuHepaaouuke kapakmepucmuke, apko3e. ABSTRACT Red sandstone formation in Eastern Serbia is widespreaded and is included in the composition of many mountains in this part of our country. This formation consists of intensely red-colored clastic rocks, psammitic, rarely psammite-psephitic ...

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)

  • 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
    ... of F, folds suggests top-WNW tec- tonic transport direction for D, phase. Transposition by solution and neo-crystallization of So„ bedding due to intense D, deformation was frequently observed (Fig. 3). Structures of D, phase were not observed neither in the Southern Triassic unit which preserves ...
    ... cases linked, sug- gesting that fault-related folding was the predominant mechanism during the Do phase. No penetrative planar structure has been observed to be associated with the D, phase except for the rare occurrence of a So» crenulation cleavage (folding the S, axial plane cleavage) in ...
    ... plastic deformation phase within our study area, and the estimated temperature based on D, microstructures is in a good agreement with the Kibler Indices, we correlate the anchizonal metamor- phism of the Northern Triassic and Paleozoic units with the D, deformation phase. Therefore, we interpret ...

  • Lamprofiri Kolaričke reke (Boranja)

    Luka Jović (2024)
    Lamprofiri su grupa egzotičnih ultrakalijskih stena poznatih po sadrţaju nekompatibilnih elemenata i elemenata retkih zemalja. U našem delu sveta pojavljuju se u okviru ultrakalijskih provincija u Španiji, Italiji, Srbiji, Makedoniji i Turskoj. U Srbiji su zastupljeni ponajviše u zapadnim delovima zemlje, oko opština Ljubovija i Mali Zvornik, ali i u široj okolini Rudnika, Kopaonika i u istočnoj Srbiji. Mnoga ispitivanja sprovedena su u rudnom polju Veliki Majdan u zapadnoj Srbiji sa čije jugoistočne strane protiče Kolarička reka. Ovaj lokalitet ...
    geohemija, lamprofiri, ultrakalijski magmatizam, elementi retkih zemalja, mešanje magmi, mineta, kersantit, flogopit
    ... Beogradu, p. 34. Janković S., 1990: Rudna ležišta Srbije, Univerzitet u Beogradu, p. 67. Hart S.R., Zindler A., 1986: In search of a bulk-Earth composition, Chemical Geology, Volume 57., p. 247-267. Hofmann A.W., 2003: Sampling Mantle Heterogenecity through Oceanic Basalts: Isotopes and Trace Elements ...
    ... Variscides, IOS Press BV, Amsterdam. Sun S., McDonough W. F., 1989: Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes , Geological Society, London. Cvetković V., Prelević D., Downes H., Jovanović M., Vaselli O., & Pćcskay Z., 2004: Origin and ...

  • Analiza toplotne moći i Vobeovog indeksa prirodnog gasa različitog porekla

    Lana Mitrović (2024)
    U radu su prikazane najznačajnije osobine prirodnog gasa, uključujući hemijski sastav, jednačine sagorevanja i termodinamičke karakteristike koje predstavljaju osnovu za dalje razumevanje rada. Prikazane su količine prirodnog gasa na evropskom trţištu prema zemlji porekla, kao i njihove zasebne hemijske i termodinamičke karakteristike.Kvalitet prirodnog gasa u Republici Srbiji je posebno poglavlje u radu u okviru kog je detaljnjije opisano snabdevanje Republike Srbije prirodnom gasom, kao i zahtevani kvalitet.Na kraju, obuhvatajući sve prethodno navedeno, prikazan je postupak rešavanja Studije slučaja koja ...
    prirodni gas, toplotna moć, Vobeov broj, zahtevani kvalitet prirodnog gasa, namešavanje

  • Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia)

    Nikita Bragin, Nevenka Đerić (2020)
    Radiolaria, Dinarides, Jurassic, stratigraphy, Serbia
    ... Bajocian. Further study of the bio- stratigraphy and detailed analysis of the sections would be needed to achieve a better understanding of the composition and nature of the Ljubiš Formation. 5. CONCLUSIONS Middle Jurassic (Bajocian-Bathonian) radiolarian assemblages were discovered in radiolarites ...

  • From DELA Based Dictionary to Leximirka Lexical Database

    Biljana Lazić, Mihailo Škorić (2020)
    In this paper, we will present an approach in transforming Serbian language Morphological dictionaries from a DELA text format to a lexical database dubbed Leximirka. Considering the benefits of storing data within a database when compared to storing them in textual documents, we will outline some of the functionality that the database has made possible. We will also show how hand-made rules that use category labels lexical entries are marked with can be used to link lexical entries. ...
    Morfološki rečnici, jezički resursi, Leksimirka
    ... time of making Leximirka database, Lemon model consisted of five modules: Ontology-lexicon interface – ontolex, Syntax and Semantics – synsem, De- composition – decomp, Variation and Translation – vartrans and Linguistic Metadata – lime. The most commonly used module is ontolex that describes lexical entry ...

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... and water vapor. First phase is bacteria fermentation, which in a process of hydrolysis dissolve complex organic compounds into smaller molecules. Second phase is the transformation of those molecules into organic acids, carbon-dioxide and hydrogen. The last phase is methane production by m ...
    ... degradation and its environmental implications with special reference to Poly(ethylene terephthalate). Polymers, 5, pp. 1-18. YUE, D. et al. (2013) Composition and Distribution of Non-Methane Organic Compounds at Municipal Solid Waste Landfill Surfaces. Semanticscholar. [Online] Available from: pdfs ...

  • Classification of mining waste landfills according to legislation in Serbia

    Dragana Nišić, Uroš Pantelić, Nikoleta Aleksić, Neda Nišić (2021)
    rudarski otpad, jalovina, uredba, deponija, kategorija A, klasifikacija
    ... terms of classification. It is determined that the landfill is cla- ssified based on the possibility of a potential failure and the character and composition of the waste disposed on it, while the process of classification according to the consequences of the failure runs thro- ugh three iterations ...

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... Bryozoans are represented by branching forms. Ac- cording to RUNDIĆ et al. (2013) the Leitha Limestone in the study area, due to the predominant fossil composition could be catego- rized as an algal-foraminifer-bryozoan type of limestone. 4.1.3. Middle Miocene (Marine-brackish Sarmatian) Rakovica deposits ...
    ... ‒ Austrian Journal of Earth Sciences, 108/2, 82–104. doi: 10.17738/ajes.2015.0015 KOVAČIĆ, M., HORVAT, M., PIKIJA, M. & SLOVENEC, DA. (2011): Composition and provenance of Neogene sedimentary rocks of Dilj gora Mt. (south Pannonian Basin, Croatia).‒ Geologia Croatica, 64/2, 121–132. doi: 10.4154/GC ...
    ... & MAN- DIC, 2008; MAGYAR et al., 2013; SANT et al., 2017). The peak of extensional tectonics was reached during the Badenian–Sar- matian rifting phase (ca. 16–12 Ma) (e.g. FODOR et al., 2005; RADIVOJEVIĆ et al., 2010; MATENCO & RADIVOJEVIĆ, 2012; RADIVOJEVIĆ & RUNDIĆ, 2016). The long-lived Lake ...

  • Preparation of Multimedia Document “YU Rock Scene”

    Milena Obradović, Aleksandra Arsenijević, Mihailo Škorić (2017)
    SUMMARY: This study will present the preparation process of a multimedia document entitled YU ROCK SCENE in which participants were senior students of undergraduate studies of the Department of Library and Information Science at the University of Belgrade Faculty of Philology during the academic year 2014/2015, as a part of the subject Multimedia Documents. This study gives an overview of the historical development of rock and roll in the territory of the former Yugoslavia, rock scene in Yugoslav republics, ...
    multimedia document, library science, information science, rock and roll, music, Yugoslavia
    ... 1103.jpg 1103b.txt 1103d.txt 1103.mp3 Table 1. Example of a part of the grupe table Figure 1. Example of a region page – Slovenia First the basic composition was made with hierarchy architecture in its core. Instead of making HTML pages for each and every region, city or band, four PHP- scripts that consult ...

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... complex BAEKTEL network. Given the Author composition of the project partners the network is initially populated by materials from the domains of ICT, geoinformatics, mining engineering and environmental ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • P-T analiza RMU Bitola – krupne klase

    Nemanja Dobrosavljević (2024)
    Cilj ovog diplomskog rada je bio ispitivanje mogućnosti i tehnologije čišćenjauglja, kao i predstaviti rezultate pliva – tone analize koja ima za cilj ocenu mogućnosti čišćenja uglja - krupnih klasa posmatranog uzorka. Da bi se ispitivanje i analiza mogućnosti čišćenja rovnog uglja u REK Bitola uspešno priveli kraju, moralo se uraditi uzorkovanje reprezentativnog uzorka iz koga se potom izdvaja prvi deo koji služi za određivanje sadržaja vlage. Pored tog dela iz uzorka se izdvaja i drugi njegov deo koji će ...
    ugalj, lignit, Bitola, PT analiza, pliva-tone analiza, čišćenje uglja, suvi ugalj, vlažan ugalj, pepeo, donja toplotna moć, čist ugalj, jalovina, bilans
    ... for determining the granulometric composition. At the end, a part ofthe sample is separated from the sampled pit coal for PT analysis. After sampling the pit coal and dividing it into segments for further analysis, an analysis of its granulometric composition was performed, using standard and non- ...

  • Mineralni i hemijski sastav čestica u atmosferi zone Kolubarskog basena i uticaj na životnu sredinu

    Željko R. Cvetković (2013-11-18)
    Čestice iz vazduha su prikupljane u blizini termoelektrane i površinskih kopovarudnika uglja u Kolubarskom basenu. Izmereni srednji sadržaji koncentracija rastvornih,nerastvornih i ukupnih taložnih materija na godišnjem nivou prelaze 200 mg/m2dan (K-1, K-3, K-4, K-5). Distribucija čestica na svim lokacijama klasifikovana je na česticeveličine veće od 10 μm, zatim na čestice veličine od 10 μm do 2,5 μm i klase česticaveličine ispod 2,5 μm. Ovakva podela je dala odnos koncentracija inhalatornih irespiratornih čestica po mernim mestima. Skenirajuća elektronska mikroskopija jepokazala ...
    mineral, četica, prašina, leteći pepeo, aerosediment, PM10, teški metali,koncentracija, veličina čestice, Kolubara
    ... (2003). Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 1. Characterization of feed coals fly ashes, Fuel 82, 1793-1811. Vassilev, V. S., Menendez, R., Borrego, D. A., Diaz-Somoano, M. and Martinez- Tarazona, R. M. (2004). Phase-mineral ...
    ... l and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 3. Characterization of magnetic and chair concentrates, Fuel 83, 1563-1583. Vassilev, V. S. and Menendez, R. (2005a). Phase-mineral and chemical composition of coal fly ashes as a basis for their m ...
    ... residues, Fuel 84, 973-991. Vassilev, V. S., Vassileva, G. C., Karayigit, I. A., Bulut, Y., Alastuey, A and Querol, X. (2005b). Phase-mineral and chemical composition of fractions separated from composite fly ashes at the Soma power station, Turkey., International Journal of Coal Geology 61, 65-85 ...

  • Mineralni i hemijski sastav čestica u atmosferi zone Kolubarskog basena i uticaj na životnu sredinu

    Željko R. Cvetković (2013-11-18)
    Čestice iz vazduha su prikupljane u blizini termoelektrane i površinskih kopovarudnika uglja u Kolubarskom basenu. Izmereni srednji sadržaji koncentracija rastvornih,nerastvornih i ukupnih taložnih materija na godišnjem nivou prelaze 200 mg/m2dan (K-1, K-3, K-4, K-5). Distribucija čestica na svim lokacijama klasifikovana je na česticeveličine veće od 10 μm, zatim na čestice veličine od 10 μm do 2,5 μm i klase česticaveličine ispod 2,5 μm. Ovakva podela je dala odnos koncentracija inhalatornih irespiratornih čestica po mernim mestima. Skenirajuća elektronska mikroskopija jepokazala ...
    mineral, četica, prašina, leteći pepeo, aerosediment, PM10, teški metali,koncentracija, veličina čestice, Kolubara
    ... (2003). Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 1. Characterization of feed coals fly ashes, Fuel 82, 1793-1811. Vassilev, V. S., Menendez, R., Borrego, D. A., Diaz-Somoano, M. and Martinez- Tarazona, R. M. (2004). Phase-mineral ...
    ... l and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 3. Characterization of magnetic and chair concentrates, Fuel 83, 1563-1583. Vassilev, V. S. and Menendez, R. (2005a). Phase-mineral and chemical composition of coal fly ashes as a basis for their m ...
    ... residues, Fuel 84, 973-991. Vassilev, V. S., Vassileva, G. C., Karayigit, I. A., Bulut, Y., Alastuey, A and Querol, X. (2005b). Phase-mineral and chemical composition of fractions separated from composite fly ashes at the Soma power station, Turkey., International Journal of Coal Geology 61, 65-85 ...