Претрага
781 items
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Ефикасност дистрибуције и коришћења природног гаса у домаћинствима
Dejan Brkić (2010-03-30)Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm... 7II 2 873II 1 3II 3 3I 2 3I 1 431I F F F F F x ∆C Q,CF ∆C C-F 0 ∆C C-F 0 ∆C C-F ∆C C,C,CF ∆C C-F 00 0 ∆C C-F ∆C C,C,CF ∆Q Q-F ∆C C-F ∆C C-F 0 ∆C C-F ∆C C,C,CF ∆C C-F 00 ∆C C-F ∆C C-F C C,C,CF (163) Матрична једначина (163) се односи на мрежу с ...
... ⎫ ∂ ∂ = ∂ ∂ ∂ ∂ = ∂ ∂ ∂ ∂ = ∂ ∂ ∂ ∂ = ∂ ∂ 5 6IV 4 6V 3 7II 2 7III 3 3I 1 3III 2 3I 1 3II ∆C C-F ∆C C-F ∆C C-F ∆C C-F ∆C C-F ∆C C-F ∆C C-F ∆C C-F M (164) В.3. Обједињени метод чворова и петљи (The Node‐Loop Method) Метод чворова ...
... 1 10 1 1 C C C C C C C C D D D D D D D D x D )D(C D )D(p D )D(p 00000 D )D(p D )D(C 0 D )D(p 0000 D )D(p 0 D )D(C D )D(p D )D(p 000 0 D )D(p D )D(p D )D(C 0 D )D(p 00 00 D )D(p 0 D )D(C D )D(p D )D(p 0 000 D )D(p D )D(p D )D(C 0 D )D(p 0000 ...Dejan Brkić. "Ефикасност дистрибуције и коришћења природног гаса у домаћинствима" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2010-03-30)
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Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems
Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević. "Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems" in Physical Review E, American Physical Society (APS) (2019). https://doi.org/10.1103/PhysRevE.100.032113
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Multiple-Criteria Decision-Making in Mine Development Planning
Sanja Bajić (2023)The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.Sanja Bajić. "Multiple-Criteria Decision-Making in Mine Development Planning" in Proceedings of the 5th International Underground Excavations Symposium, 5-6-7 June 2023, Istanbul, Topkapi : Dinç Ofset Mat. Rek. San. ve Tic. Ltd. Şti. (2023)
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The analysis of the geothermal energy capacity for power generation in Serbia
Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)... is [1]: t[°C] ~27315 (1) 1112 7 [4.91 —log(SiO, )] Finally, for the expected temperatures below 100°C, formula for the amorphous silica geothermometer [8] is: t[°C]= 27315 (2) 731 t[°C]= : [452 — log(SiO, )] ~27315 (3) The Giggenbach [9] Na-K geothermometer has formula: t [ C] Na K � � ...
... for groundwater below 100 °C because it may long remain oversaturated with respect to quartz. Table 1. Results of estimated groundwater temperatures on the basis of applied geothermometers Locality Tm SiO2amorphous [°C] SiO2chalcedony [°C] SiO2quartz [°C] Giggenbach [°C] (1) Vranjska spa (VG-2 ...
... also is characterized by elevated silica. Amorphous SiO2 (60-80 mg/L at 0 °C; 100-140 mg/L at 25 °C; 300-380 mg/L at 90 °C) is much more soluble than the almost insoluble crystalline SiO2, quartz in particular (6 mg/L at 25 °C). Solubility of SiO2, both amorphous and crystalline, grows with the rising ...Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk. "The analysis of the geothermal energy capacity for power generation in Serbia" in Thermal Science, National Library of Serbia (2013). https://doi.org/10.2298/TSCI120215033S
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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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Laboratory testing of fly ash
Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction... 0 % 423,5 0 % 402,0 0 % 402,0 L 2 % 790,7 C 2 % 1139,6 L 2 % 783,1 C 2 % 1159,0 L 2 % 787,5 C 2 % 1147,2 L 4 % 753,7 C 4 % 1308,5 L 4 % 864,9 C 4 % 1333,4 L 4 % 817,2 C 4 % 1324,4 L 6 % 735,8 C 6 % 1250,6 L 6 % 950,4 C 6 % 1202,8 L 6 % 832,6 C 6 % 1227,1 The value ranges of the uniaxial ...
... 538,4 0 % 527,2 0 % 527,2 L 2 % 1147,8 C 2 % 1139,6 L 2 % 1039,3 C 2 % 1159,0 L 2 % 1087,4 C 2 % 1147,2 L 4 % 1890,1 C 4 % 1308,5 L 4 % 1726,8 C 4 % 1333,4 L 4 % 1772,8 C 4 % 1324,4 L 6 % 2312,0 C 6 % 1250,6 L 6 % 2390,8 C 6 % 1202,8 L 6 % 2387,4 C 6 % 1227,1 The value ranges of the uniaxial ...
... Compressive strength Rc / kPa L 2 % 1489,5 C 2 % 1663,8 L 2 % 1352,7 C 2 % 1542,2 L 2 % 1406,0 C 2 % 1523,4 L 4 % 2668,9 C 4 % 1901.0 L 4 % 2723,7 C 4 % 1610,6 L 4 % 2689,2 C 4 % 1748,7 L 6 % 4196,1 C 6 % 1831,2 L 6 % 4094,7 C 6 % 1883,6 L 6 % 4008,0 C 6 % 1872,5 3.5.2 Indirect tensile strength ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Laboratory testing of fly ash" in Tehnički vijesnik (2016). https://doi.org/10.17559/TV-20150317171035
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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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Efficiency and lifetime of medium voltage transformers
Snežana Aleksandrović, Vesna Damnjanović. "Efficiency and lifetime of medium voltage transformers" in XVI International Scientific – Professional Symposium, INFOTEH, Jahorina, 22. mart - 24. mart 2017., Istočno Sarajevo : Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu (2017)
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Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia
Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeFen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic. "Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia" in Environmental Earth Sciences, Springer Science and Business Media LLC (2019). https://doi.org/10.1007/s12665-019-8452-4
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Утицај обртног магнетног поља на дерацемизацију кристала натријум-хлората
... H Op3HHe porTanje TIOJba, Beh CaMO 0J1 Đ=croBe JauuHc [5]. [1] C. Viedma, Phys. Rev. Lett., 94 (2005) 005504-1-065504-4. [2] C. Rougeot, F. Guillen, J.-C Plaquevent, G. Coquerel, Cryst. Growth Des., 15 (2015) 2151—2155. [3] C. Xiouras, J. V. Aeken, J. Panis, J. H. T. Horst, T. V. Gerven, G. D ...
... field rotational frequency, but only on its strength [5]. [1] C. Viedma, Phys. Rev. Lett., 94 (2005) 0065504-1-065504-4. [2] C. Rougeot, F. Guillen, J.-C Plaquevent, G. Coquerel, Cryst. Growth Des., 15 (2015) 2151—2155. [3] C. Xiouras, J. V. Aeken, J. Panis, J. H. T. Horst, T. V. Gerven, G. D ...
... KpHcTaja HaTpHjyM-XJopaTa MH3 BOJUĆHHMX pacrBopa dacHheHMx Ha TeMmeparypH 7,={(3l.0+0.1)C. Kpucrama cy HyKJIeHcaHH H pacjiH y TOHIJIOTHO H3OJTIOBaHoj mocy,)uH ca 20 ml pacrBopa Ha TeMrIIepaTypH 7T =(26.0+0.1)"C , y oOprHOM MaTrHCTHOM ITIOJby jauHHe B = (150+9) mT, npu Op3HHH porauuje 200-1200 ob/min ...М. Милојевић, А. Жекић, П. Дабић, Б. Вучетић, Б. Максимовић. "Утицај обртног магнетног поља на дерацемизацију кристала натријум-хлората" in XXVII конференција Српског кристалографског друштва, Чачак, 14-15. јун, 2023., Београд : Српско кристалографско друштво (2023)
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Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije
Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacijaJelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar. "Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije" in 11. Međunarodna konferencija “Ugalj i kritični materijali" CCM 2023, Zlatibor, 11-14. oktobar 2023., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2023)
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Tectonic evolution of the Circum-Moesian orocline of the Carpatho-Balkanides: Paleomagnetic constraints
Emő Márton, Vesna Cvetkov, Miodrag Banješević, Gábor Imre, Aleksandar Pačevski. "Tectonic evolution of the Circum-Moesian orocline of the Carpatho-Balkanides: Paleomagnetic constraints" in Journal of Geodynamics, Elsevier BV (2024). https://doi.org/10.1016/j.jog.2024.102058
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Polyhedral characteristics of the cosalite-type crystal structures
Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus. "Polyhedral characteristics of the cosalite-type crystal structures" in The Canadian Mineralogist, Mineralogical Association of Canada (2019). https://doi.org/10.3749/canmin.1900017
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A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenikaGordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević. "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, Elsevier BV (2021). https://doi.org/10.1016/j.marpetgeo.2021.105383
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Managing mining project documentation using human language technology
Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentationAleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja . "Managing mining project documentation using human language technology" in The Electronic Library (2018). https://doi.org/10.1108/EL-11-2017-0239
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The effect of finite driving rate on avalanche distributions
Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear PhysicsSonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević. "The effect of finite driving rate on avalanche distributions" in Journal of Statistical Mechanics: Theory and Experiment, IOP Publishing (2021). https://doi.org/10.1088/1742-5468/ac1f12
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Lamprofiri Kolaričke reke (Boranja)
Luka Jović (2024)Lamprofiri su grupa egzotičnih ultrakalijskih stena poznatih po sadrţaju nekompatibilnih elemenata i elemenata retkih zemalja. U našem delu sveta pojavljuju se u okviru ultrakalijskih provincija u Španiji, Italiji, Srbiji, Makedoniji i Turskoj. U Srbiji su zastupljeni ponajviše u zapadnim delovima zemlje, oko opština Ljubovija i Mali Zvornik, ali i u široj okolini Rudnika, Kopaonika i u istočnoj Srbiji. Mnoga ispitivanja sprovedena su u rudnom polju Veliki Majdan u zapadnoj Srbiji sa čije jugoistočne strane protiče Kolarička reka. Ovaj lokalitet ...geohemija, lamprofiri, ultrakalijski magmatizam, elementi retkih zemalja, mešanje magmi, mineta, kersantit, flogopit... Ctc/OP?b t/II6GP?T PcOtcO'b O B P A / O ' JN PCLG61'0 9 0 c 6 0 C O tetlOPTO0 8ogbcCO0 IV SbP8cCIRC COCg'C IIGIG/C I6GccOC O C C I C C C 6/OS6/.C S O I G B ' C IV L O C C L L I P6CSP69'lL /CctcOR'T Z t O I O Z I LL Lbt861'6 CPtP/O'6 tI9CO01l'6 CCGCPbC6 ...
... 1I60I8O0'S 9O0ISIgC 9 6 0 1 P i (6O/SdBdCR C/CPOL'P} PSCSS6'C OCCCBO't PSIC6/'C +6tO0867C tc8068C 68C8O8'C 96COPO'S P6OSt6'P #SCc69/P6'P SIN OPC8C'O O C I / C C O C c 8 8 O P C IC/tCOr'I PIIGCCO C6cC/09'0 O S P I I E C /OICCCC t6B8C8O'I OCIP/ST O6CredCC SdeCIOPC ...
... 8 6 / P I F O CcIIcTO c g c e I T O 1088900 t60990'0 O 6cc610'0 Pc6cIO0'0 I/OCIO'0 tc1Oc0'0 bće! C t R P A C I ICCOIP' I PPStE/P I C P P C C P I PSOSPP I cIZ/ECI OCOOPP'I Ćl 1 8 8 1 0 1 tPoc6'O C/S/OO0'T oclIcO' O o C L S L C P COOO/LC'P PIPoSP?b ...Luka Jović. Lamprofiri Kolaričke reke (Boranja), 2024
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Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels
Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković. "Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels" in SPE Journal (2023)
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Long-term planning methodology for improving wood biomass utilization
The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković. "Long-term planning methodology for improving wood biomass utilization" in Energy, Elsevier BV (2019). https://doi.org/10.1016/j.energy.2019.03.105
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Application of Peleg model on mass transfer kinetics during osmotic dehydratation of pear cubes in sucrose solution
Vesna Pavelkić, Tanja Brdarić, Marija Petrović, Gavrilo Šekularac, Milica Košević, Lato Pezo, Marija Ilić (2015)The applicability of Peleg model was investigated for predicting mass transfer kinetics during the osmotic dehydration (OD) process of pears, at different concentrations (40, 60 and 70%, w/w) and temperatures (20, 35 and 50 °C) of sucrose solution. Increase in sucrose solution concentration resulted in higher water loss (WL) and solid gain (SG) values through the osmotic treatment period. After 360 min of osmotic treatment of pears, WL ranged from 23.71 to 31.68% at 20 °C, from 24.80 to ...Vesna Pavelkić, Tanja Brdarić, Marija Petrović, Gavrilo Šekularac, Milica Košević, Lato Pezo, Marija Ilić. "Application of Peleg model on mass transfer kinetics during osmotic dehydratation of pear cubes in sucrose solution" in Chemical Industry and Chemical Engineering Quarterly (2015). https://doi.org/10.2298/CICEQ141014004P