Претрага
584 items
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Facies analyses, biostratigraphy and radiometric dating of the Lower-Middle Miocene succession near Zajecar (Dacian basin, eastern Serbia)
Ljupko Rundić, Nebojsa Vasić, Miodrag Banješević, Dejan Prelević, Violeta Gajić, Bojan Kostić, Jelena Stefanović (2020)Седиментна сукцесија између доњег и средњег миоцена и складан тј. дискордантан однос између језерско-континенталних наслага (нпр. DLS, SLS) и баденских морских седимената представља једну од занимљивих тема. У овом раду смо проучавали пет истражних бушотина (источна Србија) и анализирали главни фацијални образац, биостратиграфске карактеристике миоценске сукцесије и применили U-Pb радиометријско датирање вулканских туфова интерстратификованих у седиментној серији са слојевима угља (бушотина NRKR-17002). Добиjeна је конкордија старост од 16,9 ± 0,2 милиона година за сва анализирана зрнца циркона без наследних ...Ljupko Rundić, Nebojsa Vasić, Miodrag Banješević, Dejan Prelević, Violeta Gajić, Bojan Kostić, Jelena Stefanović. "Facies analyses, biostratigraphy and radiometric dating of the Lower-Middle Miocene succession near Zajecar (Dacian basin, eastern Serbia)" in Annales geologiques de la Peninsule balkanique, National Library of Serbia (2020). https://doi.org/10.2298/GABP1902013R
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Testing the energy value of different types of coal by the method of active thermography
In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković. "Testing the energy value of different types of coal by the method of active thermography" in 9th International Scientific Conference on Defensive Technologies, Belgrade, Serbia, 15-16 October 2020, The Military Technical Institute (2020)
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Projection of SO2 emissions in coal power plants in Serbia
Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac (2023)The production of electricity in the countries of South-Eastern Europe (SEE) was mainly related to the use of coal, predominantly lignite. The total installed capacity of thermal power plants using coal in these seven countries is 17.813 MW, distributed in 31 thermoblocks. The mentioned plants are the dominant pollutant emitters in all observed countries. Data on the largest emitters in the countries of the European Union and a comparison with SEE countries were collected. The calculation of emissions of ...... plants in Serbia;Projekcija emisije SO2 u termoelektranama na ugalj u Srblji Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Projection of SO2 emissions ...
... plants in Serbia;Projekcija emisije SO2 u termoelektranama na ugalj u Srblji | Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac | 9th International Conference Mining and environmental protection, Sokobanja 24-27th May 2023. | 2023 | | http://dr ...
... Serbia PROJEKCIJA EMISIJE SO, U T FRMOELEKTRANAMA NA UGALJ U SRBLJI Aleksandar Madžarević!, Predrag Jovančić!, Stevan Đenadić', Fi ilip Miletić!, Miodrag Ristović”, Miroslav Crnogorac! ! Univerzitet u Beogradu – Rudarsko-geološki fakultet, Beograd, SRBIJA, E-mail: aleksandar.madzarevic(orgf.bg.ac ...Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac. "Projection of SO2 emissions in coal power plants in Serbia" in 9th International Conference Mining and environmental protection, Sokobanja 24-27th May 2023., Belgrade : University of Belgrade, Faculty of Mining and Geology (2023)
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Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)
Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović. "Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)" in Challenges : Sustainable Land Management – Climate Change, Advances in Geoecology 43, Catena Verlag GMBH (2014)
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Distribution Modulo One of the Sum of Powers of a Salem Nubmer
Stankov Dragan (2015)Stankov Dragan. "Distribution Modulo One of the Sum of Powers of a Salem Nubmer" in Šesti simpozijum Matematika i primene zbornik radova, Beograd:Univerzitet u Beogradu Matematički fakultet (2015)
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New Technology for Prevention of Eolian Erosion of Ash on the Ash Disposals in Power Plant Nikola Tesla in Serbia
Ristović Ivica, Borisavljević Ana (2010)Ristović Ivica, Borisavljević Ana. "New Technology for Prevention of Eolian Erosion of Ash on the Ash Disposals in Power Plant Nikola Tesla in Serbia" in Global Change-Challenges for Soil Management no. 41, :CATENA VERLAG GMBH (2010): 278-285
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Problemi i smerovi istraživanja u razvoju bežičnih senzorskih mreža u rudarstvu
Aleksandrović Snežana, Jović Mihajlo, Damnjanović Vesna. "Problemi i smerovi istraživanja u razvoju bežičnih senzorskih mreža u rudarstvu" in Zbornik radova [Elektronski izvor] / Yu Info 2014, 20th Conference and Exhibition, Kopaonik 9-13. mart 2014, Beograd:Društvo za informacione sisteme i računarske mreže (2014): 112-115
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Assessments of effects of implementation of strategic plans for development of Belgrade District heating system
The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić. "Assessments of effects of implementation of strategic plans for development of Belgrade District heating system" in Sustainable Cities and Society, Elsevier BV (2020). https://doi.org/10.1016/j.scs.2020.102304
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Business Models for Small-scale Biomass Projects Development
Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...... Business Models for Small-scale Biomass Projects Development Dejan Ivezić1, Miodrag Gluščević2, Marija Živković1 1University of Belgrade – Faculty of Mining and Geology 2Standing Conference of Towns and Municipalities, Belgrade Abstract: Biomass is recognized as the most promising ...Dejan Ivezić, Miodrag Gluščević, Marija Živković. "Business Models for Small-scale Biomass Projects Development" in 19th International Conference on Thermal Science and Engineering of Serbia, Niš : Faculty of Mechanical Engineering (2019)
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Sprega neuronskih mreža i numeričkih modela zadefinisanje sigurnih rastojanja kod razletanja komada pri miniranju
Saša S. Stojadinović (2013-09-16)Doktorska disertacija sa navedenim naslovom prezentuje rezultate istraživanjaproblema razletanja komada pri miniranjima. Cilj istraživanja bio je kreiranje opšteg iuniverzalno primenljivog modela za prognozu maksimalnih dometa razletelih komada idefinisanje sigurnih rastojanja. Kombinacijomterenskih istraživanja, numerikogmodeliranja balistikih trajektorija razletelih komada i adaptivne prirode neuronskihmreža definisan je koncept neuro-numerike sprege. Sprega je objedinila univerzalnuprimenljivost numerikog modela i sposobnost prilagoavanja neuronskih mrežalokalnim uslovima u opšti model za prognozu maksimalnih dometa razletelih komada.Za potrebe sprege, a kao integralni deo disertacije, razvijen je metod za odreivanjekoeficijenta ...Razletanje, miniranje, domet, sigurna rastojanja, numeriki modeli,neuronske mreže, sprega, verifikacijaSaša S. Stojadinović. "Sprega neuronskih mreža i numeričkih modela zadefinisanje sigurnih rastojanja kod razletanja komada pri miniranju" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-09-16)
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Upotreba lidar tehnologije i digitalne fotogrametrije primenom iPhone pametnih telefona na primeru rudnika "Rudnik"
Nikola Mirković, Luka Crnogorac, Aleksa Paunović. "Upotreba lidar tehnologije i digitalne fotogrametrije primenom iPhone pametnih telefona na primeru rudnika "Rudnik"" in 15. Simpozijum „Rudarstvo 2024“ Održivi razvoj u rudarstvu i energetici, Vrnjačka banja, 21-24. maj 2024., Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina (2024)
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Споменица 1991. – 2015. година: 135 година геологије и 70 година рударства на Универзитету у Београду
... г начина израде подземних просторија у руднику мрког угља "Беране" Израда подзем. просторија Р. Токалић Н. Видановић, К. Путић 139. Танасковић М. Миодраг 22.03.2011. Техно - економска анализа оправданости хомогенизације угља са површинског копа "Тамнава", РБ "Колубара" ПМС Д ...
... Jović N., Pavlović Miodrag B., Kremenović A., Manojlović D., Vučinić-Vasić M., Nikolić Aleksandar S.: Magnetization enhancement in nanostructured random type MgFe2O4 spinel prepared by soft mechano- chemical route, Journal of Applied Physics, 2010. 26. Burić N., Ranković D., Todorović K., Vasović N.: ...
... са подземном експлоатацијом Механизација и аутоматизација у рударству и енергетика В. Чокорило З. Петковић, Н. Видановић 54. Денић Д. Миодраг 26.02.1999. Моделирање параметара проветравања откопа у руднику мрког угља "Соко" Вент. и тех. заштита Н. Лилић Д. Гагић, Ј. Пејчиновић ...главни и одговорни уредник Душан Поломчић. Споменица 1991. – 2015. година: 135 година геологије и 70 година рударства на Универзитету у Београду, Београд : Универзитет у Београду, Рударско-геолошки факултет, 2016
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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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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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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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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
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Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema
Svetlana M. Štrbac-Savić (2016-06-10)Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija... periodu k moţe se reprezentovati skupom tehnologija eksploatacije (MTS): ( ) ( ), ( ) : ( ) , ( ) , ( ) moţe ostvariti ( ) .g lMTS k I k O k I k R O k R I k O k (4.1) gde je 1 2, ,...,k k k gI k i i i ulazni vektor tehnologije eksploatacije, a 1 2, ,...,k k k lO k ...
... 748 10 1 8,749 10 1 9,492 10 1 0,0027 k y k x k x k x k x k x k x k e x k x k x k x k 1 5 1 6 325 1 0,0517784 1 ; 0,1,2,3,4 x k x k k (5.1) AGO i IAGO ...
... 748 10 1 8,749 10 1 9,492 10 1 0,0027 k y k x k x k x k x k x k x k e x k x k x k x k 1 5 1 6 325 1 0,0517784 1 ; x k x k k=5+h; h=0,1,2,3,4 DOL-AGO 7,892 8,981 ...Svetlana M. Štrbac-Savić. "Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-06-10)
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The number of unimodular roots of some reciprocal polynomials
Dragan Stankov (2020)We introduce a sequence P2n of monic reciprocal polynomials with integer coefficients having the central coefficients fixed. We prove that the ratio between number of nonunimodular roots of P2n and its degree d has a limit when d tends to infinity. We present an algorithm for calculation the limit and a numerical method for its approximation. If P2n is the sum of a fixed number of monomials we determine the central coefficients such that the ratio has the minimal limit. ...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. "The number of unimodular roots of some reciprocal polynomials" in Cmptes rendus mathematique (2020). https://doi.org/10.5802/crmath.28
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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... K3YbSi2O7. M2 0eff M2 1eff M2 2eff E1/k (K) E2/k (K) � (K) � (K)† 1.904 (3) 4.4 (3) 7.1 (2) 82 (4) 253 (19) �0.015 (3) �56 (1) † Obtained from Curie–Weiss law within the 150–300 K range. electronic reprint research papers when studied at a very low temperature (~10' K). In the present case, the deviation ...
... interactions. The obtained value of 6 = —0.015 K shows that exchange inter- Table 11 Effective magnetic numbers and positions of the crystal field levels of the symmetrically independent Yb** ion in K;YbSi,Oy. Moetr Mie Mio Ek (K)— Exlk (K) 0 (K) 0 (K)t —56 (1) 1.904(3) 4.4(3) 7.1(2) 82(4) 253 (19) ...
... Starting from room temperature the sample was heated to 1273 K with a rate of 200 K h�1. The maximum temperature was maintained for 12 h. Subsequently, the container was cooled to 1023 K at a rate of 2 K h�1. When reaching a temperature of 1023 K, the furnace was switched off. The resulting material was ...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