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Упит dcterms_creator_txt:Bojan B. Hajdin

951 items

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... borehole (Krupaja Spring, thermal spring, and borehole B-1). Sustainability 2023, 15, 11146 4of14 Karstification bl,depih Thermal spring Borehole B-1 Figure 3. Krupaja system phenomena (Krupaja Spring, thermal spring, and borehole B-1). Borehole B-1 log according, to video-endoscopy, thermal logging ...
    ... Serbia _+ r ? F| . o s 5 ing Borehole B-1 [0] ! Krupaja spring = 5 Pz h E [ % < Fj | |-} ~+ 0a |55] Figure 1. Geographic location of the Krupaja karst system with micro location of (ML): Karst spring, thermal spring, and borehole B-1. The Krupaja Spring is a strong spring ...
    ... 17 Krupaja Spring, 57 0.3 26.1 0.7 Table 4. Results of ŽH radioactive isotope content test in thermal spring, and B-1 borehole. Radioactive Isotope ŠH (TJ) (+/—) 1 Sigma Borehole B-1 3.9 0.3 Krupaja thermal spring, 1.7 0.2 During the high flow period, young, freshly infiltrated water primarily ...

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... respectively B1 to B6 in B, and C1 to C5 in C. At the second level of synthesis, A, B and C parameters are synthesized into the M (Figure 4).Energies 2020, 13, x 9 of 15 Figure 4. Hierarchical structure of fuzzy composition. Partial indicators of optimal method of selection, A, B and C, are presented ...
    ... Part of the Model The synthesis of partial indicators (A, B, C) into one (M) is performed by fuzzy composition, which is a model that provides the structure of indicators-influencing M performance. In other words, if the influence indicators A, B and C are presented as fuzzy numbers [20], their composition ...
    ... C4—very high, C5—low, a GL method is obtained. Partial indicators of optimal method of selection, A, B and C, are presented as membership function µ: A = (µA 1, . . . , µA j, . . . , µA n); B = (µB 1, . . . , µB j, . . . , µB n); C = (µC 1, . . . , µC j, . . . , µC n); (2) M assessment is obtained ...

  • Palinomorfe sa lokaliteta Gostuška reka (Stara planina)

    Ivan Rutović (2024)
    U radu su prikazani rezultati palinološkog istraživanja permsko-trijaskih sedimenata sa lokaliteta Gostuška reka. Palinološki kompleksi su detaljno analizirani, što je omogućilo morfološku, taksonomsku i paleoekološku identifikaciju palinomorfi. Istraživanje je pokazalo prisustvo velikog broja spora i polena golosemenica, dok je polen skrivenosemenica zastupljen u manjem procentu. Na osnovu paleoekoloških analiza, zaključeno je da je tokom formiranja sedimenata na lokalitetu vladala aridna klima, sa povremenim vlažnim fazama koje su omogućavale razvoj močvarne vegetacije.
    palinomorfe, paleoekologija, perm - trijas, Stara planina, Gostuška reka
    ... (00)00076-2 4nđelković J., Krstić B., Bogdanović P., Jadranin D., Milenković P., Milošaković R., Fotić P., i Jovanović LJ., 1969: Osnovna geološka karta SFRJ – Pirot 1:100 000. Beograd: Zavod za geološke i geofizička istraživanja. 4Anđelković J., Krstić B., Bogdanović P., Jadranin D., Milenković ...
    ... sporae dispersae des neiderrheinischen Zechsteins. — Fortschr. Geol. Rheinid. U. Westf, Krefeld, str. 6 — 24. Tvančević B., Savić S., Sabovljević M., Niketić M., Zlatković B., Tomović G., Lakušić D., Ranđelović ., Ćetković 4., Pavićević D., Krpo–Četković J., Crnobrnja-Isailović J., Puzović S. ...
    ... rpepanta (CC BY-NC-ND) AyTOpcTBO — HEKOMePIHJaJIHO — J(eJ1HTH IIOJ{ HCTHM yCJ1OBHMa (CC BY-NC-SA) Ayropcrno — 06e ripepajta (CC BY-ND) . i B O B | AyTOpcTBO — J(eJIHTH ITOJ( HCTHM ycJ1OBHMa (CC BY-SA) (Qaokpyotcume cao jeOHy oO wecm nonybenux nuujenHuyu. Kpamak onuc utyeniyu je cacmasenu ...

  • Neogena i kvartarna herpetofauna (Anura i Squamata) Srbije : doktorska disertacija

    Dragana D. Đurić (2019)
    U radu je prvi put opisan deo herpetofaune (Anura i Squamata) iz neogenih i kvartarnih lokaliteta Srbije. Obrađeni su lokaliteti Sibnica, Prebreza, Lazarevc, Vračević i Riđake, neogene starosti. Lokaliteti kvartarne starosti su pećine Mala i Velika Balanica, Pešturina, Hadži Prodanova, Baranica, Vrelska pećina i sedimentne ispune fisura u kamenolomima Venčac i Beočin. U radu je prikazana je taksonomska analiza herpetoloških ostataka. Pored taksonomske analize fosilnog materijala dat je kratak geografsko-geološki opis proučavanih lokaliteta, osnovne osteološke karakteristike anura i skvamata ...
    paleoherpetofauna, Anura, Squamata, kvartar, pleistocen, neogen, Srbija, paleoekologija, paleoklima
    ... skeletni elementi guštera opisani u ovom radu. A – premaksila, B – maksila, C – dentale, D – parietale, E – frontale, F – postfrontale, G – palatinum, H – pterigoid, I – jugale, J – kvadratum. A,B,C,D,E,F,G,H,I,J – spoljašnja strana, A’,B’,C’,D’,E’,F’,G’,H’,I’,J’ – unutrašnja strana, A’’ – bočno. (iz ...
    ... istaknutiji u poređenju sa B. bufo (sl. 49a). Preacetabularna jama jasno uočljiva a proksimalni nastavak (ala ilii) je nešto tanji i duži nego kod B. bufo. Skapula ima ravnomerno razvijene pars glenoidalis i pars acromialis, ponekad je razvijena i fossa supraglenoidalis (kod B. calamita mnogo razvijenija ...
    ... Vračević, premaksila: a – labijalno, b – lingvalno. NH-115/3. Sl. 2a, 2b. Latonia gigantea (Lartet, 1851); Vračević, maksila: a – labijalno, b – lingvalno. NH-115/5. Sl. 3a, 3b. Latonia gigantea (Lartet, 1851); Vračević, fragment maksile: a – labijalno, b – lingvalno. NH-115/2. Sl. 4a, 4b. ...

  • Microscopical characterization of carbon materials derived from coal and petroleum and their interaction phenomena on making steel electrodes, anodes and cathodes blocks

    Predeanu G., Panaitescu C., Balanescu M., Bieg G., Gómez Borrego A., Diez M.A., Kwiecińska B., Marques M., Mastalerz M., Misz-Kennan M., Pusz S., Suárez Ruiz I., Rodriguez S., Singh A.K., Varma A., Zdravkov A., Životić Dragana (2013)

  • Microemulsion with aromatic oil as cleaner media for electropolymerisation

    M. Ilić, F.-H. Haegel, S. Zlatanovic, N. Potkonjak, B. Simonovic (2005)
    Abstract Microemulsion polymerization is widely used as a cleaner alternative way to prepare intrinsically conductive polymers. We studied isothermal phase diagrams for microemulsions of the electropolymerizable heterocyclic aromatic oil 3,4-ethylenedioxythiophene (EDOT), aqueous LiClO4 solution and alkyl polyethoxylate. Our specific goal was to assess the effect of LiClO4 salt on the phase behaviour. The phase behaviour was characterized by stepwise titration and microscopic analyses. Here we found that the increase of the concentration of LiClO4 salt shifts the microemulsion region ...
    Микроемулзија, понашање фаза, EDOT, LiClO4

  • Geomechanical research for defining terms of performing the first section of waterproof screen in the open pit “Drmno”

    Dragana Savić, Majstorović Jelena, Dimitrijević Bojan (2012)

  • Laboratorijska geomehanička ispitivanja odloženog morenskog materijala na površinskom kopu Zagrad-Nikšić,

    Majstorović Jelena, Korać Milutin, Dimitrijević Bojan (2012)

  • Results of laboratory tests for ultrasound anisotropy bridge chains across the Boka Kotorska bay

    Majstorović Jelena, Stepanović Saša, Dimitrijević Bojan (2010)

  • Анализа могућности селективног одлагања на површинским коповима источног дела Колубарског басена угља

    Илић Саша, Шубарановић Томислав, Димитријевић Бојан (2017)

  • Вулканолошке одлике северозападног дела лецког вулканског комплекса. Српски геолошки конгрес, Врњачка Бања, 17‐20. мај 2018, Књига апстраката 1, 198-200.

    Костић Бојан, Цветковић Владица, Шарић Кристина (2018)

  • The occurrence of iron mineralization in vicinity of Ostenjak (Aranđelovac), Serbia

    Pantelić Nemanja, Kostić Bojan, Vulić Predrag (2016)

  • Вулканолошке одлике северозападног дела лецког вулканског комплекса. Српски геолошки конгрес, Врњачка Бања, 17‐20. мај 2018, Књига апстраката 1, 198-200.

    Костић Бојан, Цветковић Владица, Шарић Кристина (2018)

  • Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells

    Bojan Martinovic, Marija Živković, Branko Grubač (2021)
    Electric submersible pumps (ESP) are applied in wells where additional energy is needed to ensure discharge of the fluid to the surface through the tubing. At the discharge side of the pump the fluid has bigger velocity, thus the pump induces a forced convection between the fluid and the tubing inner surface. Understanding of convective heat transfer in wellbores and analyses of influential parameters provides a possibility to optimise value of convective heat transfer coefficient in order to avoid ...
    prenos toplote konvekcijom, ESP pumpa, svojstva fluida, problemi u radu bušotine

  • Vulkanološke odlike severozapadnog dela Leckog vulkanskog kompleksa

    Bojan Kostić, Vladica Cvetković, Kristina Šarić (2018)

  • Tehnika i tehnologija izrade koso-usmerenih i horizontalnih lateralnih bušotina za potrebe odvodnjavanja površinskih kopova

    Мitrović Vladimir, Dimitrijević Bojan, Stupar Jelka (2010)

  • The geochronological comparison of three major porphyry systems in Timok magmatic complex: Bor, Veliki Krivelj and Čukaru Peki

    Miloš Velojić, Dina Klimentyeva, Bojan Kostić (2022)

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... mine closure and reclamation Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Conversion of land areas after coal mine closure and reclamation | Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić | 9th International ...
    ... Conference MINING AND ENVIRONMENTAL PROTECTION May 2023, Serbia CONVERSION OF LAND AREAS AFTER COAL MINE CLOSURE AND RECLAMATION Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia radmila.gacinarpf.bg.ac.rs; bojan.dimitrijevicorgf ...

  • Увођење доменских и семантичких маркера за област рударства у српске електронске речнике

    Иван Обрадовић, Александра Томашевић, Ранка Станковић, Биљана Лазић (2017)
    ... 16 И в ан О б р ад о в и ћ , А л ек с ан д р а Т о м аш ев и ћ , Р ан к а С тан ко в и ћ , Б и љ ан а Л ази ћ 1 5 4Табела 4. Резултати обраде текстова за рударски корпус Тип текстова Б р о ј те к ст о в а Б р о ј р еч ен и ц а Б р о ј р еч и Б р о ј р аз л ...
    ... при- казани су постојећи и новопредложени доменски маркери значајни за област рударства. И в ан О б р ад о в и ћ , А л ек с ан д р а Т о м аш ев и ћ , Р ан к а С тан ко в и ћ , Б и љ ан а Л ази ћ 1 5 0Табела 1. Доменски из области рударства Маркер Опис Статус Примери +Mining Рударство ...
    ... и примерима приказана је у табели 3, заједно са примерима употребе пос- тојећих маркера. И в ан О б р ад о в и ћ , А л ек с ан д р а Т о м аш ев и ћ , Р ан к а С тан ко в и ћ , Б и љ ан а Л ази ћ 1 5 2Табела 3. Семантички маркери за област рударства Маркер Опис Статус Примери ...

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... for the R indicator, analyst number 1 assigned it 70% to grade ‘A’ and 30% to grade ‘B’. For indicator M he assigned 40% to grade ‘A’ and 60% to grade ‘B’, while for indicator S, he assigned to grades ‘A’ and ‘B’ 30% to 70%, respectively. The other five machines were also evaluated following the same ...
    ... and the results are shown in Tables 4 and 5. Table 4. Results of questionnaire for new machines. Analyst B1-N B2-N B3-N ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ 1. R 0.7 0.3 0.8 0.2 0.6 0.4 M 0.4 0.6 0.7 0.3 0.5 0.5 S 0.3 0.7 0.6 0.4 0.6 0.4 2. R 0.6 0.4 0.6 0.4 0.3 0.7 M 0 ...
    ... 475 0 0 0 Energies 2019, 12, 4044 11 of 18 Table 5. Results of questionnaire for old machines. Analyst B1-O B2-O B3-O ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ 1. R 0.6 0.4 0.7 0.3 0.8 0.2 M 0.6 0.4 0.6 0.4 0.4 0.6 S 0.3 0.7 0.5 0.5 0.4 0.6 2. R 0.9 0.1 0.5 0.5 0.2 0.8 M 0 ...