Претрага
393 items
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Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells
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 ...Bojan Martinovic, Marija Živković, Branko Grubač. "Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells" in International Journal of Oil, Gas and Coal Technology, Inderscience Publishers (2021). https://doi.org/10.1504/IJOGCT.2021.10043281
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Održiva eksploatacija izvorišta mineralnih voda na primeru Vrnjačke banje
Vladimir Živanović, Veselin Dragišić, Sava Magazinović, Jakov Andrijašević, Nebojša Atanacković (2022)Jedna od najznačajnijih i najposećenijih banja u Srbiji je Vrnjačka Banja koja je poznata po bogatstvu i dugoj istoriji korišćenja mineralnih voda. Obimna hidrogeološka istraživanja izvedena proteklih nekoliko decenija ukazala su na ograničenost rezervi mineralnih voda u uslovima dosta složene hidrogeološke građe područja pojavljivanja. Poslednjih godina eksploatacija ovog dragocenog resursa zadobija novu dimenziju, naročito nakon privatizacije pojedinih hotelskih kompleksa kada se povećavaju potrebe za mineralnim vodama i od kada počinje izrada novih vodozahvata što dovodi u pitanje održivu eksploataciju ...mineralne vode, izvorišta mineralnih voda, održivo korišćenje mineralnih voda, monitoring mineralnih voda, Vrnjačka BanjaVladimir Živanović, Veselin Dragišić, Sava Magazinović, Jakov Andrijašević, Nebojša Atanacković. "Održiva eksploatacija izvorišta mineralnih voda na primeru Vrnjačke banje" in Zbornik radova XVI srpskog Simpozijum o hidrogeologiji sa međunarodnim učešćem, Univerzitet u Beograd, Rudarsko-geološki fakultet (2022)
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Definisanje parametara čvrstoće na smicanje kod izvođenja kosina u ispucalom stenskom masivu
Zoran M. Berisavljević (2016-04-01)Definisanje parametara čvrstoće na smicanje ispucalih stenskih masa predstavlja jedanod najzahtevnijih zadataka mehanike stena. Geotehnička istraživanja su uglavnomograničena na rezultate laboratorijskih ispitivanja malih makroskopski homogenihuzoraka, sa kojih se vrši ekstrapolacija rezultata na terensku razmeru. Ispitivanja semogu vršiti in situ, ali su i ona ograničena veličinom korišćene aparature imikrolokacijom na kojoj se vrše ispitivanja. Pored toga, moguće je vršiti različitaispitivanja na fizičkim modelima, koja su veoma složena i skupa. Ekstrapolacijapodataka sa malog uzorka na terensku razmeru daje mnogo bolje rezultate ...naponsko stanje, ispucalost, heterogenost, čvrstoća na smicanje, geološki indeksčvrstoće, Hoek-Brownov materijal, kompozitni uzorci, dezintegracija, povratna analizaZoran M. Berisavljević. "Definisanje parametara čvrstoće na smicanje kod izvođenja kosina u ispucalom stenskom masivu" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-04-01)
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Low-temperature phase transition and magnetic properties of K3YbSi2O7
Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica... phase transition; magnetic properties; crystal field splitting; lanthanide silicates. CCDC references: 1774871; 2089284 Supporting information: this article has supporting information at journals.iucr.org/b Low-temperature phase transition and magnetic properties of K3YbSi2O7 Predrag Dabić,a* ...
... with interesting luminescent and magnetic properties (Felsche, 1973; Latshaw et al., 2015a; Figueiredo et al., 2016, and references cited therein). REE silicates also exhibit a broad structural diversity (Liebau, 1985). According to their magnetic properties, the alkaline REE silicate structures can ...
... determined. The magnetic properties of K3YbSi2O7 are interpreted based on the features of its crystal structures. Using group theory, the structural phase transition between �- and �0-K3YbSi2O7 was analyzed in more detail and its possible influence on the magnetic properties of K3YbSi2O7 was examined ...Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović. "Low-temperature phase transition and magnetic properties of K3YbSi2O7" in Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, International Union of Crystallography (IUCr) (2021). https://doi.org/10.1107/S2052520621006077
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Microstructural and magnetic properties of electrospun hematite/cuprospinel composites
Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic MaterialsMira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić. "Microstructural and magnetic properties of electrospun hematite/cuprospinel composites" in Journal of Materials Science: Materials in Electronics, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s10854-020-03526-0
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The shear strength evaluation of rough and infilled joints and its indications for stability of rock cutting in schist rock mass
Construction of E75 highway section through Grdelica gorge was one of the most demanding projects realized in recent Serbian history. The alignment approximately 25 km long consists of several tens of bridges, two tunnels, three galleries and cuts with total length of 6 km. The alignment passes through highly anisotropic Palaeozoic schist rock formation of different weathering grades. This study focuses on shear strength properties of discontinuities, which are found to be the critical feature contributing to the occurrence ...Dušan Berisavljević, Zoran Berisavljević, Svetlana Melentijević. "The shear strength evaluation of rough and infilled joints and its indications for stability of rock cutting in schist rock mass" in Bulletin of engineering geology and the environment, Springer (2022). https://doi.org/10.1007/s10064-022-02580-8
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Mineraloške karakteristike granitoida Južne Pelagonije posmatrane kroz akcesorne minerale
Cvetko Markov (1965)Cvetko Markov. Mineraloške karakteristike granitoida Južne Pelagonije posmatrane kroz akcesorne minerale, Beograd:Rudarsko-geološki fakultet, 1965
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Kristalografske i kristalohemijske karakteristike nemetaličnih minerala iz skarnova rudnog polja Sasa
Tena Šijakova-Ivanova (1989)Tena Šijakova-Ivanova. Kristalografske i kristalohemijske karakteristike nemetaličnih minerala iz skarnova rudnog polja Sasa, Beograd:Rudarsko-geološki fakultet, 1989
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Geološke karakteristike nalazišta juvelirskih mineralnih sirovina Šumadijskog mineragenetskog rejona
Lidja Marčeta (2005)Lidja Marčeta. Geološke karakteristike nalazišta juvelirskih mineralnih sirovina Šumadijskog mineragenetskog rejona, Beograd:Rudarsko-geološki fakultet, 2005
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Stepen oslobađanja minerala u zavisnosti od koncentracije korisne komponente u sirovini i finoće usitnjavanja
Rudolf Tomanec (1989)Rudolf Tomanec. Stepen oslobađanja minerala u zavisnosti od koncentracije korisne komponente u sirovini i finoće usitnjavanja, Beograd:Rudarsko Geološki Fakultet, 1989
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Contribution to the geotechnical classification of municipal waste landfills in Serbia
Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental EngineeringDragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić. "Contribution to the geotechnical classification of municipal waste landfills in Serbia" in Environmental Geotechnics, Thomas Telford Ltd. (2018). https://doi.org/10.1680/jenge.18.00028
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Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery
... Monteiro S.N. (2008) Characteristics of clays and properties of building ceramics in the state of Rio de Janeiro, Brazil. Construction and Building Materials, 22, 781–787. Winkler H.G.F. (1954) Bedeutung der Korngrossenverteilung und des Mineral-bestandes von Tonen fir die Herstellung grobkerarnischer ...
... Mineralogy The mineral phases identified in the CIMx sample are kaolinite/ halloysite, mica/illite, smectite, quartz, paragonite, feldspar, calcite and hematite ( ), in accordance with the mineral phases reported by Milošević et al. ( ). Quartz is the most abundant non-clay mineral, while calcite ...
... production of pottery in the broad sense is one of the oldest activities in human history. With the discovery, 30,000 years ago, of the special properties that clay acquires upon firing, the first synthetic material was created: ceramic (Vandiver et al., 1989). To date, in Serbia, only the Zlakusa ...Maja Milošević, Biljana Đorđević, Mihovil Logar. "Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery" in Clay Minerals (2020). https://doi.org/10.1180/clm.2020.20
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Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites
Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković. "Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites" in Science of Sintering (2023). https://doi.org/10.2298/SOS220512013S
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Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)
Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...Nevenka Novaković, Predrag Dabić, Vesna Matović. "Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2023). https://doi.org/10.1007/s12665-023-10794-6
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Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty
... masses anisotropy is especially manifested on their following properties: mechanical resistance, elasticity, deformability, water permeability and heat conductivity. Rocks often exhibit a macroscopic anisotropy of mechanical properties (Petružálek et al., 2008). Ultrasonic laboratory experiments on ...
... (2015) Ultrasonic pulse velocity for the evaluation of physical and mechanical properties of a highly porous building limestone. Ultrasonics, 60, pp. 33 – 40. YAVUZ H. et al. (2006) Estimating the index properties of deteriorated carbonate rocks due to freeze–thaw and thermal shock weathering ...
... show evidence for both layering and fracture related anisotropy in different rock types (Melaku, 2007). Ultrasonic velocities are related to the properties of the stone and they can thus be applied to assess the quality of the stones, to detect any presence of microscopic fissuring and cracks, to ...Miloš Gligorić, Jelena Majstorović, Suzana Lutovac. "Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty" in Underground Mining Engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2018). https://doi.org/10.5937/PodRad1832001G
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Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)
Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović. "Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)" in Materials, MDPI AG (2024). https://doi.org/10.3390/ma17040820
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Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4
Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan. "Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4 " in XIV Conference of chemists, technologists and environmentalists of Republic of Srpska, Academy of sciences and arts of the Republic of Srpska, Banja Luka, Republic of Srpska, B&H, October 21st-22nd, 2022, University in Banjaluka, Faculty of Technology (2022)
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Geološke karakteristike i praktični značaj nalazišta juvelirskih mineralnih sirovina Fruške gore
Zoran Ž. Miladinović (2005)Zoran Ž. Miladinović. Geološke karakteristike i praktični značaj nalazišta juvelirskih mineralnih sirovina Fruške gore, 2005
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Metalični minerali i rude kontaktno-metamorfnog oreola kopaoničkog granitoida
MIloš Radukić (1965)MIloš Radukić. Metalični minerali i rude kontaktno-metamorfnog oreola kopaoničkog granitoida, Beograd:Rudarsko Geološki Fakultet, 1965
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Proučavanje mineralno-hemijskog sastava i prostorne orjentacije žičnih serpentinskih minerala
Mihovil Logar (1989)Mihovil Logar. Proučavanje mineralno-hemijskog sastava i prostorne orjentacije žičnih serpentinskih minerala, Beograd:Rudarsko Geološki Fakultet, 1989