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769 items
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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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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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Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal
Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)... oC (b), 450 oC (c) and 500 oC (d)., Figure S2: TICs of liquid products obtained by HDPE pyrolysis in the open system at 400 oC (a), 450 oC (b) and 500 oC (c), Figure S3: TICs of aliphatic fractions of liquid products obtained by lignite/HDPE co-pyrolysis in the open system at 400 oC (a), 450 oC (b) and ...
... (a), 450 oC (b) and 500 oC (c), Figure S7: Mass fragmentograms m/z (170 + 184 and 178 + 192) of aromatic fractions of liquid products obtained by pyrolysis in the open system at 500 oC; lignite (a, c), lignite/HDPE mixture (b, d), Figure S8: TGA-FTIR thermograms of lignite (a), HDPE (b) and lignite/HDPE ...
... obtained by pyrolysis in the open system at 500 oC; lignite (a), HDPE (b), lignite/HDPE mixture (c), Figure S5: TICs of aromatic fractions of lignite EOM (a), and liquid products obtained by lignite pyrolysis in the open system at 400 oC (b), 450 oC (c) and 500 oC (d), Figure S6: TICs of aromatic fractions ...Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović. "Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal" in Polymers, MDPI AG (2021). https://doi.org/10.3390/polym13050759
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Keyword Extraction from Parallel Abstracts of Scientific Publications
... inter- section of a set of keywords annotated by a human (A) and a set of keywords annotated using algorithm (B) divided by the number of keywords annotated using the algorithm: P = A ∩ B B . (1) The recall is calculated as the number of keywords in the intersection of a set of keywords annotated by ...
... I., Lazić, B., Trtovac, A.: Rule-based auto- matic multi-word term extraction and lemmatization. In: Proceedings of the 10th International Conference on Language Resources and Evaluation, LREC 2016, Por- torož, Slovenia (2016). ISBN 978-2-9517408-9-1 15. Stanković, R., Krstev, C., Lazić, B., Vorkapić ...
... s. - The Repository is available at: www.dr.rgf.bg.ac.rs Keyword Extraction from Parallel Abstracts of Scientific Publications Slobodan Beliga1(B), Olivera Kitanović2, Ranka Stanković2, and Sanda Martinčić-Ipšić1 1 Department of Informatics, University of Rijeka, Radmile Matejčić 2, 51 000 Rijeka ...Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić . "Keyword Extraction from Parallel Abstracts of Scientific Publications" in Sematic Keyword-Based Search on Structured Data Sources - Third International KEYSTONE Conference, IKC 2017 Gdańsk, Poland, September 11–12, 2017 Revised Selected Papers and COST Action IC1302 Reports, Springer (2017)
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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 ...Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić, Goran Todorović, Dragan Novaković. "Izbor rotornih bagera za proces revitalizacije: primer rotornih bagera SRs 1200 u rudarskom basenu Kolubara" in XIV Međunarodna konferencija OMC 2020, Zlatibor, Srbija, 14-17. oktobar 2020., Jugoslovenski komitet za površinsku eksploataciju (2020)
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Geostatički proračuni sanacije klizišta šipovima
U ovom radu su, polazeći od rezultata geotehničkih istraživanja, prikazani geostatički proračuni sanacije klizišta vertikalnim šipovima. Metodologija proračuna je složena, jer podrazumeva interakciju klizišta i stabilizirajućih šipova. Stoga se simultano analiziraju stabilnost klizišta i stabilnost šipova. Prilikom određivanja bočne otpornosti tla oko šipova koristi se metoda Brinč Hansena koja uzima u obzir trodimenzionalne uslove u tlu i može da se primeni u složenim geološkim uslovima koji su česti u Srbiji. Analize stabilnosti klizišta vrše se odgovarajućim metodama granične ravnoteže. ...sanacija klizišta, interakcija klizišta i šipa, bočna otpornost šipova, stabilnost klizišta i šipova... c — kohezija К K. - koeficijenti bočnog pritiska tla Dijagrami za određivanje kocficijenta K, i K. dati su na Slikama 2 i 3. Na ovim dijagramima B је širina/prečnik šipa, а ф је ugao unutrašnjeg trenja. = Ке = 759 К = 222 р c=1–S 80 g=45'__|--1""T" o=40. ——— ·_,··"' /" 50 — _ | = 40 | ___---81 ...
... 7___ 40.2 / -_'_________-–·—···""—–"·_– — 1,93 ;zi:: zip 00 __ —18.14 r= 5 1 ___ | _____log? | ) 4»/"_/ К'„' = 0 2а ф = 0% 2 р & a 2 20 0 5 102/B 15 20 2/8 Slika 3. Koeficijent bočnog.pritiska а koji zavisi od kohezije (Brinč Hansen, 1961) Figure 3. Coefficient of lateral pressure which is ...
... 460. , 2018, pp. 111-127. Duncan, J.M., Wright, S.G.: Soil strength and slope stability, John Wiley & Sons, New Yersey, 2005, pp. 297. Hansen, J. B.: The ultimate resistance of rigid piles against transversal forces, Danish Geotechnical Institute, Bulletin No. 12, Copenhagen, 1961. Hutchinson, J ...Slobodan Ćorić, Dragoslav Rakić, Dušan Berisavljević. "Geostatički proračuni sanacije klizišta šipovima" in Zbornik radova osmog naučno-stručnog međunarodnog savetovanja - Geotehnički aspekti građevinarstva, Savez građevinskih inženjera Srbije, (2019)
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A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia
When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...... available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Please cite this article as: B. Pavlović, D. Ivezić andM. Živković, Amulti-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case ...
... Accepted 4 February 2021 Available online xxxx Keywords: Electricity generation Renewable energy sources Multi-criteria decision analysis Serbia a b s t r a c t When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective ...
... could contribute to accomplishing renewable energy targets (SOR, 2020) since Serbia ∗ Corresponding author. E-mail address: boban.pavlovic@rgf.bg.ac.rs (B. Pavlović). is largely dependent on coal. Around 2/3 of domestic electricity generation originates from lignite-fired thermal power plants. The challenges ...Boban Pavlović, Dejan Ivezić, Marija Živković. "A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia" in Energy Reports, Elsevier BV (2021). https://doi.org/10.1016/j.egyr.2021.02.072
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Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia
... Jurassic paleomagnetic results from stable core: Tectonic implications. Tecfonopihnsics 700701, |-- 18. Schmid, S.M., Bemoulli, D., Figenschuh, B., Matenco, B., Schefer, S., Schuster, R., Tischler, M. & Ustaszewski, K. 2008. The Alpine — Carpathian — Dinaric orogenic system: correlation and evolution ...Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović. "Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia " in Environmental, Structural and Stratigraphical Evolution of the Western Carpathians, 11th ESSEWECA Conference, Geophysical Institute, Slovak Academy of Sciences Bratislava (2018)
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Some models for determination of parameters of the soil oscillation law during blasting operations
... Surface S confined by continuous curve y = f (x), x-axis, and vertical lines x = a and x = b, if f (x) ě 0 for a ď x ď b (Figure 1), as the definite integral of the function f (x), obtains the following: S “ b ż a f pxq dx (17) Energies 2016, 9, 617 5 of 15 ...
... spaced, namely if: Ri`1 ´ Ri “ hi pi “ 1, 2, . . . , N ´ 1q (21) Energies 2016, 9, 617 5 of 15 a b X Figure 1. Surface S confined by continuous curve y = f(x), x-axis, and vertical lines x = a and x = b. When carrying out blasting operations, we register (measure) at suitable measuring points the values ...
... c 3 ¨ Q 4 ¨ π (4) Energies 2016, 9, 617 3 of 15 By replacing the value r0 from the Equation (4) into Equation (3), we obtain: v “ Kv ¨ ˝ 3 b 3¨Q 4¨π r ˛ ‚ n “ Kv ¨ ˜ 3 c 3 4 ¨ π ¸n ¨ ˆ 3 ? Q r ˙n “ Kv ¨ K1 ¨ ˆ r 3 ? Q ˙´n “ K ¨ ˆ r 3 ? Q ˙´n “ K ¨ R´n (5) where as: ˜ ...Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić. "Some models for determination of parameters of the soil oscillation law during blasting operations" in Energies, Basel, Switzerland : MDPI (2018). https://doi.org/10.3390/en9080617
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Примена геоелектричних атрибута и псеудо 3Д интерпретација података добијених укрштеним квадратним распоредом у кластичном депозиционом систему
Сретеновић Бранислав, Васиљевић Ивана, Цветков Весна, Бродић Бојан. "Примена геоелектричних атрибута и псеудо 3Д интерпретација података добијених укрштеним квадратним распоредом у кластичном депозиционом систему" in Оптимално истраживање и одрживо коришћење геолошких ресурса : зборник радова XVI конгреса геолога Србије, Donji Milanovac, 22-25.05.2014. = Optimal Reserach and Sustainable Usage of the Geological Resources : proceedings of the XVI Serbian Geologcal, Београд:Српско геолошко друштво (2014): 691-698
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Application of Finite Difference Time Domain method in Pulsed Thermography
Tomić Ljubiša, Elazar Jovan, Damnjanović Vesna, Milanović Bojan. "Application of Finite Difference Time Domain method in Pulsed Thermography" in Book of abstracts FOTONIKA 13, Belgrade, Serbia:Institute of Physics University of Belgrade (2013): 122-122
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Defect Detection in Aluminium Using Pulse Thermography for a Simple width Periode Structure
Tomić Ljubiša, Elazar Jovan, Damnjanović Vesna, Milanović Bojan. "Defect Detection in Aluminium Using Pulse Thermography for a Simple width Periode Structure" in The 3rd International Conference on the Physics of Optical Materiales and Devices ICOM 2012, Belgrade, Serbia:Agencija FORMAT Belgrade (2012): 269-269
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Integrated Management of Groundwaters in Mountain Areas-Zlatibor Mountain Case Study (Western Serbia, Europe)
Milenić Dejan, Milanković Đuro, Vranješ Ana, Dončev Bojan. "Integrated Management of Groundwaters in Mountain Areas-Zlatibor Mountain Case Study (Western Serbia, Europe)" in Proceedings of the AWRA 50 th Annual Water Resources Conference, Tysons Corner, VA, USA, :American Water Resource asociation (2014)
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Bacteriological pollution of the groundwater of karst springs in Zlatibor
Milenić Dejan, Vranješ Ana, Dončev Bojan, Jovanović Marina. "Bacteriological pollution of the groundwater of karst springs in Zlatibor" in Proceedings of the 22nd International Karstological School “Classical Karst” Karst and microorganisms, Postojna, Slovenia, Postojna:Karst Research Institute ZRC SAZU (2014): 55-56
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Повећање енергетске ефикасности површинског копа угља Дрмно у Републици Српској применом хоризонталних дренажних бушотина
Шубарановић Томислав, Степановић Саша, Димитријевић Бојан, Петровић Бранко. "Повећање енергетске ефикасности површинског копа угља Дрмно у Републици Српској применом хоризонталних дренажних бушотина" in Зборник радова Међународна конференција термоенергетика и одрживи развој TENOR 2011, Угљевик, Република Српска, БиХ:Народна Библиотека Филип Вишњић -Бијељина (2011)
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Rešenje sistema za navodnjavanje spoljašnjeg odlagališta površinskog kopa Drmno
Milanović Radomir, Vuković Zoran, Dimitrijević Bojan, Pavlović Milan. "Rešenje sistema za navodnjavanje spoljašnjeg odlagališta površinskog kopa Drmno" in Zbornik radova 5. Međunarodna konferencija UGALj 2011 no. V, Zlatibor, Srbija:Jugoslovenski Komitet za površinsku eksploataciju Saveza inženjera rudarstva i geologije Srbije (2011): 191-198
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Енергетски развој Републике Србије базиран на површинској експлоатацији
Јованчић Предраг, Димитријевић Бојан, Шубарановић Томислав, Степановић Саша. "Енергетски развој Републике Србије базиран на површинској експлоатацији" in VII -Стручно саветовање са међународним учешћем из области површинске и подземне експлоатације минералних сировина no. VII, Радовиш, Македонија:Здружение на рударските и геолошки инжењери, Македонија (2014)
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Preview of irrigation system for the Drmno open pit mine outer dump solution
Milanović Radomir, Dimitrijević Bojan, Vuković Zoran, Pavlović Milan. "Preview of irrigation system for the Drmno open pit mine outer dump solution" in X national conference of the open and underwater mining of minerals with international participation no. XI, Varna, Bulgaria:Scientific and Technical Union of Mining, Geology and Metallurgy (2011): 312-317
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Energetski razvoj Republike Srbije baziran na površinskoj eksploataciji lignita
Jovančić Predrag, Dimitrijević Bojan, Šubaranović Tomislav, Stepanović Saša. "Energetski razvoj Republike Srbije baziran na površinskoj eksploataciji lignita" in VII Stručno savetovanje sa međunarodnim učešćem – PODEKS-POVEKS 2014 1, Radoviš:Udruženje rudarskih i geoloških inženjera Republike Makedonije (2014): 203-211
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Geomehanical Aspects Of The Openpit Mutalj External Landfill Design
Čebašek Vladimir, Gojković Nebojša, Dimitrijević Bojan, Rupar Veljko. "Geomehanical Aspects Of The Openpit Mutalj External Landfill Design" in Proceedings of the 13th International Symposium Continuous surface mining ISCSM 2016, Beograd:Yugoslav Opencast Mining Committee (2016): 33-44