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388 items

  • Analiza uporednog praćenja temperature površine ohlađenih materijala pri njihovom zagrevanju do ambijentalne temperature

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Katarina Nestorović (2021)
    U datom eksperimentalnom radu su termografskim metodama ispitivane termofizičke karakteristike različitih materijala. Za ispitivanja su izabrani mesingani niovčić, ugalj i pelet, jer imaju različita termoizolaciona svojstava i različito stanje površine. Uzorci su najpre hlađeni, a zatim je njihovo zagrevanje na sobnoj temperaturi praćeno termalnom kamerom. U drugom delu eksperimenta, korišćena je impulsna termografija, a zagrevanje površine uzoraka vršeno je svetlosnom pobudom.
    termografija, impulsna termografija, nedestruktivno testiranje materijala, mesing, ugalj, pelet

  • Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera

    Aleksandra B. Kolarski (2016-08-25)
    Radio talasi vrlo niskih frekvencija VLF (eng. Very Low Frequency) frekventnog opsega od 3 do 30 kHz, koji se prostiru talasovodom Zemlja-jonosfera (50 -90 km) su, kao što je poznato, efikasni i nezamenljivi u osmatranju pojava u niskoj jonosferi, sa tla...
    prostiranje talasa vrlo niskih frekvencija, talasovod Zemlja-jonosfera, globalno električno kolo, atmosfersko električno pražnjenje, kratkotrajne svetlosne pojave
    ... to 1.61011 m-3, while the dissipated energy is estimated to vary between 5.4 kJ and 714 MJ. VLF perturbations related to elve event occurrence with parent lightning peak current of 250 kA amount to electron density of 7107 m-3, with the dissipated energy estimated to 6 GJ. The present results ...
    ... appropriate time scales. In this study we focus on ionization changes that most dominantly affect the VLF wave propagation: the strong release of energy by atmospheric lightning discharges. The increased ionization along the propagation path is apparent in the perturbation (incr ...
    ... 1. Primer načina zapisa podataka o pražnjenjima registrovanih WWLLN mrežom Y/M/D Hr:Mn:sec.fract UT Lat () Lon () resid (s) nsta Energy (J) energy_ uncertainty (J) esta 2012/4/23 00:00:00.149517 26.5463 135.4961 13.2 9 2741.38 332.49 5 2012/4/23 00:00:00.834707 ...

  • Analiza rada električnih centrifugalnih pumpi

    Milica Stanojević (2024)
    Ovaj rad analizira rad električne centrifugalne pumpe (ESP) u naftnoj industriji, sa fokusom na problem taloženja kamenca (karbonatnih naslaga) unutar sistema. Električne centrifugalne pumpe (ESP) predstavljaju srce mnogih naftnih bušotina. Njihova visoka pouzdanost i sposobnost rada u zahtevnim uslovima čine ih neophodnim za stabilnu i kontinuiranu proizvodnju.Senzori igraju ključnu ulogu u praćenju rada ESP sistema i detekciji ranih znakova taloženja kamenca. Problem taloženja kamenca je izuzetno značajan, jer može dovesti do smanjenja efikasnosti pumpe, povećanja troškova održavanja, i dugoročnih zastoja ...
    električne centrifugalne pumpe (ESP), formiranje kamenca (karbonatnih naslaga), hemijski inhibitori
    ... h centifugalnih pumpi 4. Senzor i SCADA sistem Senzori u SCADA automatizaciji su komponente sistema automatizacije koje mere fizičke uslove (Energy Savers Technical Services LLC). Senzor meri sedam parametara, uključujući ulazni pritisak, temperaturu fluida, temperaturu namotaja motora, temperaturu ...
    ... 41 Analiza rada električnih centifugalnih pumpi s/Brochures/web/CorsairMotors-08-19.pdf?nav=en-US_artificial- lift public (23.10.2020). 14. Energy Savers Technical Services LLC, URL: https://www.energysavers.me/sensors/ 15.Mitra, N., 2012. „„Principles. of rtificial Liff”, URL: https://www ...

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... that HTC-obtained carbon containing materials from glucose and fructose do not possess crystal structures. It was of interest to determine whether additional activation with different hydroxides had an influence on crystalline structures of prepared carbonaceous materials, i.e., whether activation takes ...
    ... reduced by carbon to K, K2O, CO, and CO2 what also, as a consequence, may have creating porous Minerals 2018, 8, 246 10 of 21 carbon surface. An additional reason for microstructure destroying is that since the boiling point of K is close to 750 ◦C (temperature of activation), it is possible that potassium ...
    ... well as about mechanism of removal of different heavy metals from aqueous solutions. However, for better understanding it is necessary to perform additional investigations and that will be the aim of our future work. After experiments on model solutions, ACs samples were also tested for the treatment ...

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... This paper has been realized in the scope of the project “Improving the technology of open pit exploitation of lignite with the goal of enhancing energy efficiency, work safety and security” (Unapređenje tehnologije površinske eksploatacije lignita u cilju povećanja energetske efikasnosti, sigurnosti ...

  • Konceptualni model hidrogeotermalnog sistema šire okoline Brusa - geotermalna karakterizacija sistema / Conceptual model of hydrothermal system of Brus area - system geothermal characterization

    Dejan Milenić, Ana Vranješ, Marinko Toljić, Ivana Vasiljević, Natalija Radosavljević, Matija Ognjanović (2024)
    Postavljeni konceptualni model hidrogeotermalnog sistema Brusa sa širom okolinom testiran je primenom različitih hidrohemijskih i izotopskih metoda u cilju njegove verifikacije i karakterizacije. Rezultati su ukazali na atomsfersko poreklo geotermalnih fluida i na razviće primarnih rezervoara u okviru karbonatnih stena. Prvi rezervoar formiran je u okviru krečnjaka gornjotrijakse starosti, dok drugi rezervoar egzistira u okviru trijskaih mermera. Zone prihranjivanja locirane su u zapadnom delu terena. Sistemi gravitacionih raseda kontrolišu kretanje fluida u sistemu, dok proces jonske izmene dominira u ...
    hidrogeotermalni sistem, hidrohemijske i izotopske metode, mladi intruzivi

  • Bezbednosna rastojanja u jamskim magacinima eksploziva u domaćoj i međunarodnoj praksi

    Luka Crnogorac, Ognjen Popović, Toma Jovičić, Veljko Lapčević (2024)
    Projektovanje jamskih magacina eksploziva predstavlja složen inženjerski problem. Sama namena jamskih magacina zahteva ispunjenost niza uslova koji se odnose na bezbedno pozicioniranje magacina, ispunjenost uslova ventilacije, pristupa, rukovođenja magacinom, načina skladištenja eksplozivnih sredstava, protivpožarne zaštite, elektro zaštite itd. Veoma važan parametar prilikom projektovanja jamskih magacina eksplozivnih sredstava predstavlja minimalno sigurnosno rastojanje između susednih komora u kojima su smeštena eksplozivna sredstva u cilju sprečavanja potencijalnog neželjenog dejstva vazdušnog udarnog talasa, razornog dejstva eksplozije i seizmičkog dejstva eksplozije. U ovom radu su prikazani ...
    jamski magacini, eksplozivi, bezbednosna rastojanja
    ... Pravilnik o tehničkim normativima pri rukovanju eksplozivnim sredstvima u miniranju u rudarstvu, Beograd Department of Natural Resoruces, Mines and Energy of Queensland (2008) Guidance Note QGN 11 Handling Explosives in Underground Mines, Queensland, Australia BNQ (2022) Explosives - Magazines for ...

  • Sinteza i strukturna karakterizacija mikroporoznih arsenata i fosfata

    Sabina Z. Kovač (2015-09-28)
    Predmet rada i istraživanja ove doktorske disertacije su sinteza i strukturnekarakteristike novih kristalnih arsenata i fosfata koji sadrže Mg, K, Ca, Mn, Fe, Co, Ni,Cu, Zn, Sr, Ba i druge katjone. U strukturama arsenata i fosfata, AsO4- i PO4-tetraedrinajčešće se vezuju sa tetraedarski ili oktaedarski koordinisanim katjonima prelaznihmetala formirajući otvorene strukture (slojeve ili 3D mreže) sa širokim opsegomrazličitih topologija. U šupljinama ili porama u obliku povezanih ili nepovezanihkanala, tunela, kaveza i međuslojnog prostora mogu se ugraditi različiti vanmrežni joni(obično ...
    hidrotermalna sinteza, mikroporozna jedinjenja, arsenati, fosfati,rendgenska strukturna analiza
    ... building units D4R dvostruki četvoročlani prsten double 4-ring EDS energetsko-disperzivna spektroskopija energy dispersive spectroscopy EDX energetsko-disperzivna rendgenska difrakcija energy dispersive X-ray en etilendiamin ethylenediamine FD gustina mreže framework density SBU sekundarna ...
    ... koristi kad se ispituju veoma mali delovi uzorka. SEM, takođe, može da se kombinuje sa EDS-om (EDS, engl. „energy dispersive X-ray spectroscopy”) koja se naziva i EDX (EDX, engl. „energy dispersive X-ray”) za dobijanja hemijske analize uzoraka. U standardnom eksperimentu proizvodi se snop primarnih ...
    ... engl. „wavelength dispersive”) ili energija (ED, engl. „energy dispersive”) emitovanog zračenja omogućava identifikaciju prisutnih elemenata. Za merenje služe spektrometri, WDS (engl. „wavelength dispersive spectometer”) i EDS (engl. „energy dispersive spectometer”). Na taj način noviji instrumenti ...

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... improvement. Acknowledgements This paper was realized as a part of the project "Improvement of Lignite Opencast Technology in Order to Increase Energy Efficiency and Occupational Safety" (TR 33039) financed by the Ministry of Education and Science of the Republic of Serbia. References 1. ...

  • A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... s and, as such, it constitutes a basis for determining which data are “critical”. The second phase is elaboration, founded upon the outcomes of additional, more recent geological and hydrogeological research. In essence, the hydrogeologic model shows the types of rocks, from a hydrogeological p ...
    ... „Polje E“ of Kolubara Coal Basin (Republic of Serbia). In: BAN, M., et al. (eds.) CD Proceedings of the 7th Conference on Sustainable Development of Energy Water and Environmental Systems. Ohrid, Republic of Macedonia, 01-07 July, 2012. Zagreb: Faculty of Mechanical Engineering and Naval Architecture ...

  • Izbor rotornih bagera za proces revitalizacije: primer rotornih bagera SRs 1200 u rudarskom basenu Kolubara

    Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić, Goran Todorović, Dragan Novaković (2020)
    Revitalizacija je proces ili skup tehničkih zahvata na mašini kojim se vrši zamena svih dotrajalih ili oštećenih delova metalne konstrukcije. Sastavni deo procesa revitalizacije je i modernizacija zastarele elektro-mašinske opreme. Principi revitalizacije sasvim sigurno nisu sadržani u okviru redovnog godišnjeg ili dnevnog održavanja. Oni predstavljaju održavanje onih veličina koje su značajne za mašinu kao celinu (u ovom slučaju rotorni bager). U ovom radu su analizirani rotorni bageri oznake SRs 1200. Na površinskim kopovima rudarskog basena Kolubara takvih bagera ima ...
    Rotorni bageri, revitalizacija, SRs1200

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... morphological characteriza- tion. The analyses were carried out on a single crystal using a JEOL JSM-6610LV instrument equipped with an Oxford INCA Energy 350 EDS detector. Synthesis and crystallization The following chemicals were used in the high-temperature flux synthesis experiment: Eu2O3 ( ...

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... and can be expressed in the range of 20% < CBR, < 150% [6]. A CBR, test can be performed in the laboratory (CBR,) and in situ (CBR+p) (Fig. 1). Additional- ly, in-situ CBR, testing can be simulated in the laboratory by conducting the CBR test using cylinders. Other than static CBR, this is the only ...
    ... d by all three test- ing devices. The influence of the measurement depth was also identical, as required for correlation without unnecessary additional influencing factors. The tests were performed on a subgrade layer made of natural stone aggregate (gravel). The subgrade layer was constructed ...
    ... as an alternative to the clas- sic method of quality control in the process of compaction and estimation of the substrate bearing capac- ity. Additional research is required to establish more precise correlations, and other material types should be considered in future work. Correlation studies ...

  • Еоценска фауна југозападног дела Сирт басена (Либија)

    Љупко Рундић, Мери Ганић (2020)
    Еоцен, крупни мекушци, нумулити, ЈЗ Сирт басен, Либија

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... ons . of the character of groundwater in areas potential for uranium mining, as well as applications of GIS in hydrogeology. As a part of her engagement at the Faculty, professor Ristić Vakanjac teaches courses in General Hydrology, Applied hydrology with basics of water management, Field Work ...
    ... y, Northern Arizona — University, fFlagstaff, and Dr. Hermann Stadler, Senior Research Fellow, from Joanneum Research - lInstitute for Water, Energy and Sustainability, Water Resources Management, Graz – Austria. CHK also had the great honor and privilege to host world-renowned experts in the ...
    ... 75:35, https://doi.org/10.1007/s12665-015-5147-3 Milenić, D., Stevanović, Z., Dragišić, V., Vranješ, A., Savić, N. (2016): Application of renewable energy sources along motorway infrastructures on high karst plateaus-West Serbia case study, Environmental Earth Science. Springer, 75:35, https://doi.org/10 ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... obedo, C.A.; S4anchez-De Jesus, F. Magnetodielectric coupling, in barium titanate-cobalt ferrite composites obtained via thermally-assisted high-energy ball milling. Ceram. Int. 2022, 48, 9527—9533. CrossRef] Dzunuzovic, A.S.; Petrovic, M.M.V.; Stojadinovic, B.S.; Ilic, N.L; Bobic, J.D.; Foschini ...
    ... ferrite nanoparticles: Synthesis by the oil-in-water microemulsion reaction method and photocatalytic water-splitting, evaluation. f. J. Hydrogen Energy 2019, 44, 12421–12429. [CrossRef] Atiq, S.; Majeed, M.; Ahmad, A.; Abbas, S.K.; Saleem, M.; Riaz, S.; Naseem, S. Synthesis and investigation of ...

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    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 ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Knowledge and Rule-Based Diacritic Restoration in Serbian

    Cvetana Krstev, Ranka Stanković, Duško Vitas (2018)
    In this paper we present a procedure for the restoration of diacritics in Serbian texts written using the degraded Latin alphabet. The procedure relies on the comprehensive lexical resources for Serbian: the morphological electronic dictionaries, the Corpus of Contemporary Serbian and local grammars. Dictionaries are used to identify possible candidates for the restoration, while the dataobtainedfromSrpKorandlocalgrammarsassistsinmakingadecisionbetween several candidates in cases of ambiguity. The evaluation results reveal that,dependingonthetext,accuracyrangesfrom95.03%to99.36%,whilethe precision (average 98.93%) is always higher than the recall (average 94.94%).
    diacritic restoration, morphological dictionary, corpus, word n-grams, local grammars
    ... presents the relations of the highlighted concept. Fig. 1 shows the relation of Import dependence concept with such concepts as Economy dependence, Energy dependence, Import substitution, Imported goods, and Import. The lower right form shows text entries for a related concept. The low right form of ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)