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1006 items
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Analiza softvera za projektovanje ESP sistema
Aleksandar Sredojević (2024)U momentu kada pritisak na dnu bušotine nije dovoljan da savlada ukupne gubitke pritisaka od dna bušotine do separatora, proizvodnja pomoću ležišne energije nije više moguća i bušotina prestaje sa eruptivnim radom. Kako bi ponovo omogućili proizvodnju fluida iz bušotine, potrebno je primeniti neke od mehaničkih metoda eksploatacije. Najprimenljivije mehaničke metode eksploatacije su: gas lift (GL), dubinske pumpe sa klipnim šipkama (SRP), električne uronjene centrifugalne pumpe (ESP), zavojne pumpe (PCP) i hidraulične pumpe (HP). Jadna od tih metoda koja ...električna centrifugalna pumpa (ESP), proizvodnja fluida, mehaničke metode eksploatacije, Prosper, Pipesim... studije ANALIZA SOFTVERA ZA PROJEKTOVANJE ESP SISTEMA Student: Mentor: Aleksandar Sredojević Prof. dr Dušan Danilović R515/23 Beograd, septembar 2024. godine Komisija: prof. dr Dušan Danilović, mentor Rudarsko-geološki fakultet Beograd doc. dr Miroslav Crnogorac, član Rudarsko-geološki ...
... prethodne uslove, Darsijeva jednačina se može rešiti da bi se pronašao protok u bušotini: 2nrkh 3.1 q= W (P- — bwfF) uin{;e q - protok, m*/dan k - efektivna propusnost, m? h - debljina sloja, m u – viskoznost tečnosti, Pas Te – drenažni radijus, m Tw - radijus bušotine, m pr - pritisak ...
... izolacije koja se bira u zavisnosti od radnog, okruženja; postoje posebne izolacije kablova za teške sredine i korozivne tečnosti (Abdlunebi Jasim, K.). Ovi kablovi rade u izuzetno teškim uslovima i moraju da ispune sledeće važne zahteve: • mali prečnik, tako da bi mogli da se postave u prsten ...Aleksandar Sredojević. Analiza softvera za projektovanje ESP sistema, 2024
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In vitro and in silico study of the biological activity of tetradentate Schiff base copper(II) complexes with ethylenediamine-bridge
Aleksandar Mijatović, Nevenka Gligorijević, Dušan Ćoćić, Snežana Spasić, Aleksandar Lolić, Sandra Aranđelović, Milan Nikolić, Rada Baošić (2023)The biological activity of six structurally similar tetradentate Schiff base copper(II) complexes, namely [Cu(ethylenediamine-bis-acetylacetonate)] (CuAA) and five derivatives where two methyl groups are replaced by phenyl, (CuPP), CF3 (CuTT) or by mixed groups CH3/CF3 (CuAT), Ph/CF3 (CuPT), and Ph/CH3 (CuAP) has been investigated. The set of antioxidant assays was performed, and the results were expressed as IC50 and EC50 values. The series of complexes showed interesting bioactivity and were investigated for the determination of antioxidant, antifungal, antimicrobial, and cytotoxic ...Aleksandar Mijatović, Nevenka Gligorijević, Dušan Ćoćić, Snežana Spasić, Aleksandar Lolić, Sandra Aranđelović, Milan Nikolić, Rada Baošić. "In vitro and in silico study of the biological activity of tetradentate Schiff base copper(II) complexes with ethylenediamine-bridge" in Journal of Inorganic Biochemistry, Elsevier BV (2023). https://doi.org/10.1016/j.jinorgbio.2023.112224
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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 ...... T E T U B E O G R A D U , R U D A R S K O - G E O L O Š K I F A K U L T E T Beograd, Đ u š i n a 7 Tehnička dokumentacija: G E O T E H N I Č K I E L A B O R A T ZA P O T R E B E I Z G R A D N J E P E Š A Č K O G M O S T A K O D S T A R O G G R A D A U UŽICU ...
... 2034 821 1/1 INJEKTING-K2 www.ading.com.mk 3-3 S t e n s k a m a s a R=1:25 2 —340x50x340 S9 mm 1 =400x50x400 ·Pocinkovana rabic mreza 1 . 6 0 x 1 9 x 1 9 m m na s v a k a 3 - 4 c m 2 =340x50x340 S i k a G r o u t Đ - 3 1 4 RS “ = 4 0 0 x 5 0 x 4 0 0 Prilog ...
... oloeo samorazlivajuci A | _ m y K I R | Q m o m a l t e r sa - a a e | | JOR 3 čianB k o m p e n z o v a n i m 132 104 90 . | | @_ \ 0 80 600 \amo@l 10 m m a d o m m m _ A C _ U _ _ m _ d e S i k a G r o u t Đ - 3 1 4 RS 0 3 0 O 1 ...Vladimir Kovačević. Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad), 2024
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Neanderthal Settlement of the Central Balkans during MIS 5: Evidence from Pešturina Cave, Serbia
Dušan Mihailović, Stefan Milošević, Bonnie A.B. Blackwell, Norbert Mercier, Susan M. Mentzer, Christopher E. Miller, Mike W. Morley, Katarina Bogićević, Dragana Đurić, Jelena Marković, Bojana Mihailović, Sofija Dragosavac, Senka Plavšić, Anne R. Skinner, Iffath I.C. Chaity, Yiwen E.W. Huang, Seimi Chu, Draženko Nenadić, Predrag Radović, Joshua Lindal, Mirjana Roksandić (2022)Recent research in the southern Central Balkans has resulted in the discovery of the first Middle Paleolithic sites in this region. Systematic excavations of Velika and Mala Balanica, and Peˇsturina (southern Serbia) revealed assemblages of Middle Paleolithic artifacts associated with hominin fossils and animal bones. This paper focuses on Pesturina Layer 4, radiometrically and biostratigraphically dated to Marine Isotope Stage (MIS) 5, which yielded traces of temporary hunting camps. The remains of large ungulate prey are associated with predominantly ...Dušan Mihailović, Stefan Milošević, Bonnie A.B. Blackwell, Norbert Mercier, Susan M. Mentzer, Christopher E. Miller, Mike W. Morley, Katarina Bogićević, Dragana Đurić, Jelena Marković, Bojana Mihailović, Sofija Dragosavac, Senka Plavšić, Anne R. Skinner, Iffath I.C. Chaity, Yiwen E.W. Huang, Seimi Chu, Draženko Nenadić, Predrag Radović, Joshua Lindal, Mirjana Roksandić. "Neanderthal Settlement of the Central Balkans during MIS 5: Evidence from Pešturina Cave, Serbia" in Quaternary International (2022)
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Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine
Orange single crystals of new polymeric cobalt(II) complex {[Co(bipy)(H2O)4]2[Co(μ-mell)(H2O)2]·10H2O}n, 1, were synthesized by slow evaporation method at room temperature (bipy = 2,2′-bipyridine, mell = hexaanion of mellitic acid) and its crystal structure was determined by single-crystal X-ray diffraction. The complex 1 was characterized based on elemental analysis, FTIR spectroscopy and thermal (TG/DTA) analysis followed by computational analysis of noncovalent interactions and quantum chemical calculations of interaction energies. In 1, two crystallographically different Co(II) atoms adopt a deformed octahedral geometry, ...Lidija Radovanović, Dušan P. Malenov, Marko V. Rodić, Aleksandar Kremenović, Jelena Rogan. "Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine" in Journal of Molecular Structure, Elsevier BV (2021). https://doi.org/10.1016/j.molstruc.2021.132202
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In vitro and in silico study of the biological activity of tetradentate Schiff base copper(II) complexes with ethylenediamine-bridge
Aleksandar Mijatović, Nevenka Gligorijević, Dušan Ćoćić, Snežana Spasić, Aleksandar Lolić, Sandra Aranđelović, Milan Nikolić, Rada Baošić (2023)The biological activity of six structurally similar tetradentate Schiff base copper(II) complexes, namely [Cu (ethylenediamine-bis-acetylacetonate)] (CuAA) and five derivatives where two methyl groups are replaced by phenyl, (CuPP), CF3 (CuTT) or by mixed groups CH3/CF3 (CuAT), Ph/CF3 (CuPT), and Ph/CH3 (CuAP) has been investigated. The set of antioxidant assays was performed, and the results were expressed as IC50 and EC50 values. The series of complexes showed interesting bioactivity and were investigated for the determination of antioxidant, antifungal, antimicrobial, and ...Aleksandar Mijatović, Nevenka Gligorijević, Dušan Ćoćić, Snežana Spasić, Aleksandar Lolić, Sandra Aranđelović, Milan Nikolić, Rada Baošić. "In vitro and in silico study of the biological activity of tetradentate Schiff base copper(II) complexes with ethylenediamine-bridge" in Journal of Inorganic Biochemistry, Elsevier BV (2023). https://doi.org/10.1016/j.jinorgbio.2023.112224
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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 ...... COMMISSION 1. Prof. Dr. Vesna Karović-Maričić Faculty of Mining and Geology 2. Prof.Dr. Branko Leković Faculty of Mining and Geology 3. Prof. Dr. Dušan Danilović Faculty of Mining and Geology Contents ONRN:2. OOA VARAANAARAAAAAAAARAANAANAANAAAANATANAANAANATAAAARAARARRRARRATARARRRARARARARARAA ...
... 2006, 18, 768—776. [24] K. J. Reddy, J. et al.: Simultaneous Capture and Mineralization of Coal Combustion Flue Gas Carbon Dioxide, Energy Procedia 2011, 4, p1574—1583. [25] A. G. N. MacDowell, N. Florin, A. Buchard, J. Hallett, N. S. G. Jackson, C. S. Adjiman, C. K. Williams, P. Fennell, :An ...
... pp. 3—14. [43] K. Kusakabe, T. Kuroda, and S. Morooka, “Separation of carbon dioxide from nitrogen using ion-exchanged faujasite-type zeolite membranes formed on porous support tubes,” Journal of Membrane Science, 1998, vol. 148, no. 1, pp. 13—-23. [44] D. Dortmundt and K. Doshi, Recent Developments ...John Nyame. Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs, 2024
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Connections between the Levant and the Balkans in the late Middle Pleistocene: Archaeological findings from Velika and Mala Balanica Caves (Serbia)
Dušan Mihailović, Steven L. Kuhn, Katarina Bogićević, Vesna Dimitrijević, Ana B. Marín-Arroyo, Jelena Marković, Norbert Mercier, Bojana Mihailović, Mike W. Morley, Predrag Radović, William J. Rink, Senka Plavšić, Mirjana Roksandić (2022)Major changes in the technological, economic, and social behavior of Middle Pleistocene hominins occurred at the onset of the Middle Paleolithic, 400e200 ka. However, until recently it was not possible to establish when, where, and how certain forms of Middle Paleolithic behavior appeared and spread into Southeastern Europe, mainly owing to gaps in the Paleolithic record. Here we report new results of dating, material culture, and the archaeological context of finds from the Balanica Cave Complex in Sicevo (Serbia). ...Dušan Mihailović, Steven L. Kuhn, Katarina Bogićević, Vesna Dimitrijević, Ana B. Marín-Arroyo, Jelena Marković, Norbert Mercier, Bojana Mihailović, Mike W. Morley, Predrag Radović, William J. Rink, Senka Plavšić, Mirjana Roksandić . "Connections between the Levant and the Balkans in the late Middle Pleistocene: Archaeological findings from Velika and Mala Balanica Caves (Serbia)" in Journal of Human Evolution (2022)
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The external aggregation Newton's method for solving nonlinear equations and applications
Marija Paunović, Dejan Ćebić, Nebojša Ralević. "The external aggregation Newton's method for solving nonlinear equations and applications" in The University Thought - Publication in Natural Sciences, Centre for Evaluation in Education and Science (CEON/CEES) (2020). https://doi.org/10.5937/univtho10-24982
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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 ...... Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic | Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović ...
... energies Article Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic Miroslav Crnogorac *, Miloš Tanasijević , Dušan Danilović, Vesna Karović Maričić and Branko Leković Faculty of Mining and Geology, University of Belgrade, 11000 Belgrade, Serbia; milos.ta ...
... and exploration of oil and gas]. Univerzitet u Beogradu, Rudarsko-Geološki Fakultet: Beograd, Serbia, 2015; p. 260. 20. Teodorovic, D.; Vukadinovic, K. Traffic Control and Transport Planning: A Fuzzy Sets and Neural Networks Approach. Int. Ser. Intell. Technol. 1998. [CrossRef] 21. Miodragovic, R.; ...Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković. "Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic" in Energies, MDPI AG (2020)
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Evaluation of melioration area damage on the river Danube caused by the hydroelectric power plant ‘Djerdap 1’ backwater
P. Pajic, L. Andjelic, U. Urosevic, D. Polomcic. "Evaluation of melioration area damage on the river Danube caused by the hydroelectric power plant ‘Djerdap 1’ backwater" in Water Science and Technology, IWA Publishing (2014). https://doi.org/10.2166/wst.2014.230
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Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems
Dejan Ćebić, Nebojša M. Ralević (2021)Dejan Ćebić, Nebojša M. Ralević. "Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems" in Journal of Mathematical Chemistry, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10910-021-01253-3
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Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer
Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)... 2023-10-14 03:22:57 Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić Дигитални репозиторијум Рударско-геолошког факултета Универзитета ...
... [ДР РГФ] Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer | Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić | Transboundary Water Resources Management - A Multidisciplinary Approach ...Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić. "Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer" in Transboundary Water Resources Management - A Multidisciplinary Approach, Weinheim, Germany : Wiley-VCH (2011): 143-149
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Оптимална конструкција бушотине на експлоатационом пољу Мајдан
Бранислав Миловановић (2024)Одређивање параметара конструкције бушотине представља најважнији корак ка сигурном и ефикасном опремању сваке бушотине. У овом раду биће предложен поступак за одређивање оптималних параметара експлоатационог поља Мајдан. Пример експлоатационог поља Мајдан ће бити коришћен за илустрацију предложеног поступка. Ово поље има специфичне геолошке и хидрогеолошке карактеристике које ће бити детаљно анализиране у раду. На основу ових анализа, биће предложени оптимални параметри бушотине који ће осигурати сигурно и ефикасно опремање бушотина на овом подручју.... Dfg) [bar] (7.2) bsv = 0,0981 · Hoy · py [bar] (7.3) 39 JIanuja ma3ajHHpatba Ha ycruMa OymorTuHe: A = Dps · K+ [bar] (7.4) Jianuja naaajHHpatba Ha neTH KOJIOHc: B = (I» — ps„) · K+ [bar] (7.5) Ine cy: Tp- HHJeKLHHOHH IIpHTHCaK Ha TICTH IIOBpIHHHCKC KOJIOHC [bar] Grpk- rpajujer(bpakrypHpatba ...
... cnane Bojle H3a ToBpmmHHcKe KonoHe [kg/dm?] Dg — rycruHa cnojHor (bayuana (raca) y cayuajy noroka y Oymoruny [kg/dm"] K+ - 0akTrop maajHapabba 3a yHyTpanimH ripHTucak (rrynambe) K» - oakrop JuiaajHupamba 3a cnoJbanıpH rpHTHcak (rEbeueMbe) 'VHonrtePbeM BPpeJiHOcTH mapaMeTapa y rope HaBe/ieHe JeiHauuHHe ...
... Ha yCTHMa OyIIOTHHC H3HOCH pPus= 182,15 [bar]|. 3arMM MO)KeMO OJpeHTH NHHHJy ,3ajHHpaMba Ha yCTHMa H Ha Hy OymroruHe noMohy jejHauHHe: A = bus · K [bar] (6.1) '3 BpeyiHocr QakTopa nuHaajHupama Ha yHyTpatiH rpHTucak oJ 1,10, gH3apauyHara BpejiHocT rparaHcKa HaHocu 200.,4 {[bar]. 28 6.2 IipopauyH ...Бранислав Миловановић. Оптимална конструкција бушотине на експлоатационом пољу Мајдан, 2024
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Definisanje geotehničkih karakteristika terena za potrebe izgradnje stanice za snabdevanje gorivom “OMV” u Trsteniku
Milica Dutina (2024)U ovom Završnom radu prikazana su istraživanja na osnovu kojih su urađeni grafički dio, proračun nosivosti i proračun analize slijeganja terena za potrebe izgradnje benzinske stanice sa pratećim objektima. Detaljno je analiziran prodajni objekat,čelični rezervoar za gorivo i znak. Za proračun graničnog opterećenja korišćena je metoda Mayerhofa, dok je analiza slijeganja urađena Konsolidacionom metodom slijeganja za prodajni objekat i čelični rezervoar za gorivo, a za temelj znaka po principu slijeganja i rotacije krutih temelja - Gorbun Posadov. Sve dobijene ...terenska istraživanja, laboratorijska ispitivanja, geotehnička istraživanja, geotehnički model terena, osnovne tehničke karakteristike, analiza slijeganja, proračn nosivosti... Slijeganje nekog k-tog sloja je izračunato po sljedećoj formuli: AG"Hk Sck — M VK 32 Sck — Konsolidaciono slijeganje k-tog sloja Ao - Priraštaj vertikalnog napona u sredini sloja k usljed dopunskog opterećenja Hy – Debljina sloja k Myk — Modul stišljivosti u sredini sloja k koji odgovara ...
... Prof. dr Dragoslav Rakić Rudarsko-geološki fakultet, Beograd 2. Prof. dr Miloš Marjanović Rudarsko-geološki fakultet, Beograd 3. Doc. dr Dušan Berisavljević Rudarsko-geološki fakultet, Beograd Datum odbrane: 27.09.2024. Rezime U ovom Završnom radu prikazana su istraživanja na osnovu ...
... benzinske stanice. 13 Bogdanje BornaHkbe —— \\ f_,·'} / j f _— __ Trstenik TpcTeHMK !OMV Diesel fuel Čairi _ Wdavipv Odžaci :T. Gernji k O ebu Pu6H Slika 3 – Prikaz lokacije OMV stanice (Google Maps) U morfološkom smislu teren Jje uniforman i predstavlja poljoprivredno zemljište ...Milica Dutina. Definisanje geotehničkih karakteristika terena za potrebe izgradnje stanice za snabdevanje gorivom “OMV” u Trsteniku, 2024
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Одређивање оптималне производње дубинске пумпе на клипним шипкама
Лука Перишић (2023)У условима смањене цене нафте, ради одржавања конкурентности на тржишту, нафтне компаније су приморане да проналазе све више начина оптимизације производне опреме. Нешто што би у време економског раста и „цветања“ нафтне индустрије био прихватив губитак, сад је прилика за уштеду и стварања предности над конкуренцијом. Инжењери производње су у оваквим околностима приморани да користе новије методе анализа и тражења бушотина кандидата за оптимизацију. Применом итеративних метода мењања параметара рада дубинских пумпи који су већ у производњи може се постићи ...Лука Перишић. Одређивање оптималне производње дубинске пумпе на клипним шипкама, 2023
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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... 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 >25 Veličina čestica (µm) April 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12 ...
... 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 >25 Veličina čestica (µm) Jun 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12 ...
... (µm) Jul 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 >25 Veličina čestica (µm) Avgust 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 ...Željko R. Cvetković. "Mineralni i hemijski sastav čestica u atmosferi zone Kolubarskog basena i uticaj na životnu sredinu" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-11-18)
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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... 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 >25 Veličina čestica (µm) April 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12 ...
... 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 >25 Veličina čestica (µm) Jun 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12 ...
... (µm) Jul 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 20 22,5 25 >25 Veličina čestica (µm) Avgust 0% 20% 40% 60% 80% 100% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 K-11 K-12 F ( % ) 2,5 5 7,5 10 12,5 15 17,5 ...Željko R. Cvetković. "Mineralni i hemijski sastav čestica u atmosferi zone Kolubarskog basena i uticaj na životnu sredinu" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-11-18)
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Analiza primenjenih metoda za transport parafinske nafte
Dunja Milojević (2024)Sadržaj parafina u nafti ima dominantan uticaj na svojstva parafinskih nafti. Taloženje parafina, odnosno taloženje čvrstih čestica parafinskog voska, predstavlja ozbiljan globalni problem tokom proizvodnje i transporta sirove nafte. Samo taloženje voska zavisi od termodinamičkih faktora, poput temperature, pritiska i sastava nafte. Transport nafte cevovodima je uobičajeni proces transporta u naftnoj industriji. Kada prilikom cevovodnog transporta parafinske sirove nafte, dođe do prekida protoka i hlađenja nafte ispod temperature stinjavanja, parafini će kristalisati, pri čemu će doći do, geliranja celokupne transportovane ...... studije ANALIZA PRIMENJENIH METODA ZA TRANSPORT PARAFINSKE NAFTE Student: Mentor: Dunja Milojević Prof. dr Dušan Danilović R104/17 Beograd, mart 2024. Komisija: 1. Prof. dr Dušan Danilović, mentor Rudarsko-geološki fakultet, Beograd 2. Doc. dr Miroslav Crnogorac, član Rudarsko-geološki ...
... Analiza postojećih domaćih grejnih kablova i razvoj specifičnog za primenu u naftnoj industriji. Tehnika - Klektrotehnika, 60, str. 606-610. 9. Doeble, K. (2018). Wax Deposition as a Function of Flow Regimes. Norway: Norwegian University of Science and Technology. 10.Elmabrouk Ali Elhaddad, E. (2014) ...
... MAPEFRE Global Risks. (2022). Oil and gas pipelines — veins of the economy. Risks Management and Insurance Magazine. 14.Misra, S., Baruah, S., & Singh, K. (1995). Paraffin Problems in Crude Oil Production And Transportation. SPE Production & Facilities, 10(1), 50-54. 15.Prstojević, B. (2012). Cevovodni ...Dunja Milojević. Analiza primenjenih metoda za transport parafinske nafte, 2024
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On the distribution modulo 1 of the sum of powers of a Salem number
Dragan Stankov (2016)It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "On the distribution modulo 1 of the sum of powers of a Salem number" in Comptes rendus Mathematique (2016). https://doi.org/10.1016/j.crma.2016.03.012