Претрага
463 items
-
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... analizirano kao primer II (linije zelene boje na istoj slici). Vertikalna isprekidana linija označava vreme kada amplituda GQD/22.1 kHz signala ima minimalnu vrednost (primer I), dok vertikalna tačkasta linija označava vreme kada amplituda signala ima maksimalnu vrednost (primer II), za koja su računate ...
... II 50 0.86 2.64 0.87 2.9 9.24102 1.18103 - - - - 75 1.09106 1.26106 - - - - 80 4.46106 5.04106 5.710-3 22.810-3 5.7 22.8 Vrednosti momenta električnog dipola MQ (Ckm) pri povećanju koncentracije elektrona do vrednosti 4.7106 m-3 za I i 5106 m-3 za II primer ...
... 24 2.1. Intenzivna atmosferska pražnjenja koja iniciraju sprajtove Snažna atmosferska pražnjenja, u završnim fazama razvoja konventivnih kompleksa srednjih razmera MCC (eng. Mesoscale Convective Complex), koja proizvode sprajtove, često prenose pozitivno naelektrisanje iz olujnog oblaka sa ...Aleksandra B. Kolarski. "Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-08-25)
-
A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)
... hidrogeološki parametri 1. INTRODUCTION Kolubara Coal Basin (KCB) is the strongest link of the Electric Power Industry of Serbia. Since World War II, it has produced more than 580,000,000 tons of coal. Every other kilowatt in Serbia comes from KCB’s lignite (brown coal). A daily extraction rate of ...Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin. "A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)" in Underground Mining Engineering no. 29, Belgrade : University of Belgrade - Faculty of mining and geology (2016): 43-54
-
Аnaliza mogućnosti povećanja nagiba završne kosine površinskog kopa “Podbraćan”
Vladimir Čebašek, Veljko Rupar (2018)Eksploatacijom boksita iz ležišta "Podbraćan" formiran je površinski kop sa maksimalnom visinom zavšne kosine od 280 m. Redovnom kontrolom stabilnosti trenutnog stanja kosina površinskog kopa utvrđeno je da faktor sigurnosti iznosi Fs = 1.71 – 1.85, a što je ukazalo da postoji mogućnost povećanja nagiba kosine. U radu je prikazan postupak analize mogućnosti povećanja nagiba završne kosine površinskog kopa "Podbraćan".Vladimir Čebašek, Veljko Rupar. "Аnaliza mogućnosti povećanja nagiba završne kosine površinskog kopa “Podbraćan”" in Mining and Geology Today, II international symposium, Belgrade, 04 - 05.12.2018., Rudarski institut, Balkanska akademija nauka, Akademija inženjerskih nauka Srbije (2018). https://doi.org/10.25075/SI.2018.17
-
GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities
Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević . "GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities" in Contributions to International Conferences on Engineering Surveying. Springer Proceedings in Earth and Environmental Sciences, Dubrovnik, Croatia, October 22-23, 2020, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-51953-7_21
-
Threshold-induced correlations in the Random Field Ising Model
... the two mechanisms: (i) implicit or explicit application of a �nite threshold resulting in low levels of avalanche activity not being detected, and (ii) e�ects due to details of the implementation of the external driving. While we focus here on the �rst mechanism, a more detailed study of the interplay ...
... the two mechanisms: (i) implicit or explicit application of a finite threshold resulting in low levels of avalanche activity not being detected, and (ii) effects due to details of the implementation of the external driving. While we focus here on the first mechanism, a more detailed study of the interplay ...
... S; are the nearest neighbors of S;, and J > 0 is a ferromagnetic coupling constant. Hence, the system Hamiltonian reads H = -J978)8; — HTS; — 7his;, (ii) i i (22) and in this expression the first sum refers only to the nearest-neighbor spins S; and S;, the second term describes the coupling of spins ...Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević. "Threshold-induced correlations in the Random Field Ising Model" in Scientific Reports, Springer Science and Business Media LLC (2018). https://doi.org/10.1038/s41598-018-20759-6
-
Српски језик у дигиталном добу -- The Serbian Language in the Digital Age
Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević (2012)... деградације информације приликом транслитера- ције из латинице у ћирилицу. Тако, на пример, www може постати њњњ, а латинично Petar II може по- стати Пеар ИИ уместо Пеар II. Оа алфаета се користе у савременој издавачкој продукцији. Према подацима из Народне илио- теке Срије, током 2010. ојављене ...
... distortion of the message when a text is transliterated from Latin to Cyrillic. us, for example www can become њњњ, аnd Latin Petar II may become Петар ИИ instead of Петар II. Both alphabets are used in contemporary publishing. According to the data of the National Li- brary of Serbia, a total of 12,57 ...
... техно- логија. Током периода санкција Уједињених нација, одржавање одређеног нивоа активности је ило мо- гуће захваљујући учешћу у пројектима TELRI I и II [52]. Иако српске истраживачке групе у то време нису могле да учествују на пројекту MULTEXT- East [53], оне су ипак произвеле корисне ресурсе у формату ...Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević. "Српски језик у дигиталном добу -- The Serbian Language in the Digital Age" in META-NET White Paper Series, G. Rehm, H. Uszkoreit (eds.), Springer (2012)
-
Development of Open Educational Resources (OER) for Natural Language Processing
In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...... There are also courses in Italian related to NLP 8 , such as the course “Linguaggio Naturale” by Francesco Cutugno from Universita di Napoli Federico II”. It aims to provide an overview of the technologies of automatic processing of written and spoken language. Another valuable educational resource ...Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević. "Development of Open Educational Resources (OER) for Natural Language Processing" in The Sixth International Conference on e-Learning (eLearning-2015), September 2015, Belgrade, Serbia, Belgrade : Belgrade Metropolitan Univesity (2015)
-
Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7
Part of E-80 highway that passes through Serbia (from the city of Nis to the administrative border Merdare) is 77 km long. The highway is divided into two sections: the first from Nis to Plocnik (39.4 km long) and the second from Plocnik to the administrative border with Kosovo. The route is designed through a typical plain and hilly terrain in which different geological units are dominant: crystalline schists, neogene sediments of foothills and quaternary sediments in the valley ...... is divided into two characteristic zones: Zone I - consists of alluvial-terraced or alluvial-proluvial sediments in the surface zone, and Zone II - consists of deluvial-proluvial sediments in the surface zone (terrain base is made of Mio- Pliocene clayey-marl sediments). On this subsection ...Dragoslav Rakić, Zoran Berisavljević, Irena Basarić, Snežana Bogdanović, Jovana Janković. "Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7" in Proceedings of the XVII European Conference of Soil Mechanics and Geotechnical Engineering ECSMGE-2019, Reykjavik, Iceland, 1-6. 09. 2019., ISSMGE, ECSMGE-2019 (2019). https://doi.org/10.32075/17ECSMGE-2019-0393
-
Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households
The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...... 20 Sept. 2020). [16] IPCC, Intergovernmental Panel on Climate Change, Climate change (2014). Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the IPCC, IPCC, Geneva, Switzerland.https://www.ipcc.ch/site/assets/uploads/2018/05/SYR_AR5_FINAL_full _wcover ...Boban Pavlović, Dejan Ivezić, Marija Živković. "Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households" in 5th International Scientific Conference ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo, 2020, University of East Sarajevo, Faculty of Mechanical Engineering East Sarajevo (2020)
-
Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US
Even in the third decade of the 21st century, large power plants are still responsible for more than half of the electricity production in Europe and US. They predominantly use fossil fuels in their work, which results in the emission of pollutants into the air, soil and water. In addition to the production of electric energy, fossil fuels, including coal, are used for industrial purposes. Although the use of coal, especially in the countries of the European Union, is ...... EU-27 and the US in 2021 [13, 14, 15] Power plant Countr: State/ emics(s)iž)ns Coal / Fuel lnsolalšd Ratio Generation Ratio Wer p MM | - Province ŠOs ii p [ICO2/MW] |_ [MWh] | |[tCO2/GWh] IMt] [MW]| Belchatow Poland | \VOjew0dZtWO | -25540 Lignite 5097 5,01 27400 0,93 lodzkie Neurath Germany | Norh ...Uroš Djorgovski, Aleksandar Madžarević, Predrag Jovančić. "Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US" in International Conference on Global Energy and Climate Change - ICGRECC-23, New York, 2023, Research Galery- Science Leagues (2023)
-
Analysis of the exhaust emissions inventory from auxiliary mining machines
Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović. "Analysis of the exhaust emissions inventory from auxiliary mining machines" in 9th International Conference Mining and Environmental Protection, University of Belgrade, Faculty of Mining and Geology (2023)
-
Control of substructure construction of railways in the Republic of Serbia
Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...... Minimum thickness constructions safe on frost including the protective layer of the planum EV2 (MN/m2) Rc* EV2 (MN/m2) Rc* Frost action zone I (m) II (m) III (m) Open track tracks, running (through) track and relief tracks 120 1,00 80 1,00 0,50 0,60 0,70 other tracks 80 0,97 45 0,95 0,30 0,40 0 ...Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović. "Control of substructure construction of railways in the Republic of Serbia" in International Conference On Contemporary Theory and Practice in Construction XV, Banja Luka 16-17 jun 2022., University of Banja Luka Faculty of Architecture, Civil Engineering and Geodesy (2022)
-
Ionothermal synthesis and crystal structure of a new organic–inorganic hybrid compound:catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]
A new organic-inorganic hybrid compound, catena-poly[bis(1-ethyl-3-methylimidazolium) [μ5-bromido-tri-μ3-bromido-tri-μ2-bromido-pentacuprate(I)]], {(C6H11N2)2[Cu5Br7]}n, has been obtained under ionothermal conditions from a reaction mixture containing Ba(OH)2•8H O, Cu(OH)2•2H2O, As2O5 , 1-ethyl-3-methylimidazolium bromide and distilled water. The crystal structure consists of complex [Cu5Br7]2- anions arranged in sinusoidal {[Cu5Br7]2-}n chains running along the a axis, which are surrounded by 1-ethyl-3-methylimidazolium cations. Three of the five unique Br atoms and one of the three Cu(I) atoms occupy special positions with half-occupancy (a mirror plane perpendicular to the b ...кристална структура, органско-неорганско хибридно једињење, бакар(I) бромид, јонотермна синтеза, 1-етил-3-метилимидазолијум бромид, Cu•••Cu интеракцијеLjiljana Karanović, Dejan Poleti, Tamara Đorđević. "Ionothermal synthesis and crystal structure of a new organic–inorganic hybrid compound:catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]" in Acta Crystallographica Section C Structural Chemistry, International Union of Crystallography (IUCr) (2014). https://doi.org/10.1107/S205322961402172X
-
Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes
Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović . "Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes" in Energies (2016). https://doi.org/https://doi.org/10.3390/en9121071
-
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)
-
A necessary and sufficient condition for an algebraic integer to be a Salem number
Dragan Stankov (2019)We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.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. "A necessary and sufficient condition for an algebraic integer to be a Salem number" in Journal de theorie des nombres de Bordeaux (2019). https://doi.org/10.5802/jtnb.1076
-
P-T analiza uglja RB Kolubara
Rada Vitomir (2024)Rudarski basen Kolubara predstavlja jedno od najvažnijih ležišta lignita u Republici Srbiji i ključni je faktor u snabdevanju zemlje energijom. Kvalitet uglja iz ovog basena direktno utiče na efikasnost termoelektrana i zadovoljenje energetskih potreba. U ovom radu, opisan je značaj tehničke i elementarne analiza uglja kako bi se utvrdili fizičko-hemijski parametri uglja iz Rudarskog basena Kolubara. U drugom delu rada dat je opis P-T analize uglja i njen značaj za ocenu mogućnosti čišćenja uglja. Takođe, dati su i rezultati ...... 1350%. Elementi-primese u uglju. U pepelu mnogih ugljeva prisutni su u većim ili manjim količinama izvesni elementi, kao germanijum, galijum, uran, bakar, berilijum, vanadijum, molibden, volfram, kobalt, zlato, srebro, elementi retkih zemalja itd. Većina ovih elemenata vezana jJe za mineralne primese ...
... SADRŽAJ BLG p AAAAAA ARAAA AAARAAA 1 2. TEORIJSKI OKVIR ... aanaaa a a aaa a aaaai ag aae 2 2.1. Osnovni pojmovi o uglju ......c.aaaaa a n a aaaaa a ii aaiaiaae 2 2.2. Karakteristike i klasifikacija uglja.... 2.3. Elementarna i tehnička analiza uglja..............aaaaaanaaaaaanaaanaadaanaot 6 2 ...
... b) slabo vezan — blagim pritiskom palca raspada se u prah c) vezan — blagim pritiskom palca raspada se u komade ; praktično bez praha i sjaja; II -umanjena polazna zapremina (skupljen) a) umereno čvrst — slabo ispucan do zaobljen kolačić, može da se zapara noktom, prija prste, crn je ı bez ...Rada Vitomir. P-T analiza uglja RB Kolubara, 2024
-
Планирање – функција менаџмента пројекта минералне индустрије
Жељко Вучић (2024)Просторно планирање је комплексан мултидисциплинаран процес утврђивања оптималног распореда људи, добара и делатности на одређеној територији ради његове оптималне употребе. Циљ просторног планирања је распоредити и најбоље користити садржаје у простору што је неизводљиво без детаљних анализа потенцијалних, штетних агенаса на целокупно подручје и његово становнисштво. Утицај рударства на окружење вишеструко се повећао након увођења технологије површинске експлоатације минералних сировина, али и свеукупног лошег дејства на животну средину. Под појом животне средине подразумевамо природне и радом створене вредности у ...... tananateranatatatataataaaaeke 35 7 MH}KEM5EPCKO-TEO71IOHIKE KAPAKTEPMCTMHME 71E}KMIMITA .........aaaaaaa a aeaaaaaaeevaeaaeaeeve 36 OBBRRRJS,G V ii el [e],|[0D,f.(o}H1:(, 7 OAARAAAAAAAARAAAAARAAAARANAAAAAAAAAAAANAAAAAAAAARARAAARANARAAAAAAAAARANANANAAAAAAAAAAAAAARAAAAAAAAAANIA 38 8.1. |= (e][0] ...
... H. (2016): KpariukH OCBpT Ha IIpaBHJIHHKC H Jpyre akTe. 30opHHK pajioBa rpabjeBHHckKor (bakynrera, CyOCoruma; 29:69-81. 11. Tpadjkopuh M, Byunh II. (2010): Varora karacrpa y nnraHHpam»y H H3rpajubH rpaJiCKOr noxjpyuja. 30opHHk pajioBa rpabeiHckor bakyanrera, Cyooruma; 19:135-40. 12. 3aKoH O ...
... (Qakynrera je (aaokpyotcumu JeOHy oO O6e onuuje): @ pe/LyKOBaHOo JUOCTyIaH KpoO3 HaCJIOB 3aBPIHor pajla H pe3HMe pajla cCa KJbyuHHM peunMa; II. JjaBHO JOcTymaH y OTBOpEHOM TIpHCTyrIIy, TaKO Jla Ta MOTy KODpHCTHTH CBH KOJH nomrryjy ojpenOe canpxkaHc y OJaOpaHoM THy JNMHHCHHC KpeaTHBHC 3ajeHHIC ...Жељко Вучић. Планирање – функција менаџмента пројекта минералне индустрије, 2024
-
Praktikum za vežbe iz Informatike 1
Ranka Stanković, Ivan Obradović, Olivera Kitanović, Mirjana Banković. Praktikum za vežbe iz Informatike 1, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, 2014
-
Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support
Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović. "Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support" in Journal of Vibroengineering (2017). https://doi.org/10.21595/jve.2016.17321