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706 items
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Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential
The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти... Agency). Available online: https://www.irena.org/geothermal (accessed on 28 May 2020). 4. Stegnar, G.; Staničić, D.; Česen, M.; Čižman, J.; Pestotnik, S.; Prestor, J.; Urbančič, A.; Merše, S. A framework for assessing the technical and economic potential of shallow geothermal energy in individual and ...
... S.; Dusseault, M. A comprehensive review of geothermal energy evolution and development. Int. J. Green Energy 2019, 16, 971–1009. [CrossRef] 8. Mahbaz, S.; Dehghani-Sanij, A.; Dusseault, M.; Nathwani, J. Enhanced and integrated geothermal systems for sustainable development of Canada’s northern communities ...
... 38. Marović, M.; Toljić, M.; Rundić, L.; Milivojević, J. Neoalpine Tectonics of Serbia; Serbian Geological Society: Belgrade, Serbia, 2007; ISBN 86-86053-03-3. 39. Toljić, M.; Matenco, L.; Ducea, M.N.; Stojadinović, U.; Milivojević, J.; Ðerić, N. The evolution of a key segment in the Europe–Adria ...Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić. "Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential" in Applied Sciences-Basel, МDPI (2021). https://doi.org/10.3390/app11062691
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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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Određivanje zbijenosti starog komunalnog otpada
Bez obzira na savremene tretmane komunalnog otpada u svetu, u Srbiji je i dalje najčešći vid odlaganja na komunalne deponije, pa zbijanje otpada predstavlja jednu od ključnih faza formiranja deponije. Na ovaj način znatno se smanjuje zapremina otpada, ubrzava proces degradacije i produžava radni vek deponije. Zbog toga su geotehničke karakteristike komunalnog otpada prilikom zbijanja, veoma bitne kako u fazi projektovanja tako i u fazi izgradnje deponije i optimizacije prostora. Tu se pre svega misli na maksimalnu suvu zapreminsku ...Jovana Janković, Dragoslav Rakić, Irena Basarić Ikodinović, Tina Đurić. "Određivanje zbijenosti starog komunalnog otpada" in Konferencija Otpadne vode, komunalni čvrsti otpad i opasan otpad, 16-18.06.2021., Beograd : Udruženje za tehnologiju vode i sanitarno inženjerstvo (2021)
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Hidrogeohemijska valorizacija esencijalnih mikroelemenata mineralnih voda Srbije
Jana S. Stojković (2013-09-25)Mineralne vode još od davnina privlače pažnju ljudi i to kako u pogledu istraživanja iproučavanja, tako i u pogledu njihovog iskorišćavanja. Naročito je važno poznavanjesadržaja mikroelemenata u njima, jer su to komponente njihovog hemijskog sastavakoje ih odvajaju od tzv. „običnih“ malomineralizovanih voda.U ovom radu proučavani su odabrani esencijalni mikroelementi (fluor, bor, litijum,kalijum, stroncijum i silicijum), u mineralnim vodama Srbije, pri čemu je analiziranopreko 130 uzoraka mineralnih voda iz različitih geoloških sredina, to jest hidrogeološkihrejona. Cilj ovog istraživanja bio je ...esencijalni mikroelementi, faktori migracije, zakonomernosti rasprostranjenja, hidrogeohemijski procesi, multivarijantna statistička analiza, mineralne vode Srbije... 1/agr11.htm. 72. Murray, J. J. (1986) Appropriate Use of Fluorides for Human Health. Geneva: World Health Organization. 73. Nešić, S. M., Marinković, S. R. i Kostić-Pulek, A. B. (2001) Opšta i neorganska hemija. Beograd: Rudarsko-geološki fakultet. 74. Osborne, J. W. (2010) “Improving your ...
... Statistics and Probability, Pp. 111-150. 5. Appelo, C. A. J. and Postma, D. (1996) Geochemistry, Groundwater and Pollution. Rotterdam: A. A. Balkema. 6. Babič, D. (2003) Mineralogija. Beograd: Prof. dr Danilo Babič. 7. Bowen, H. J. M. (1966) Trace Elements in Biochemistry. New York: Academic ...
... the Natural Environment on Public Health, by O. Sellinus, et al., Elsevier, Pp. 301-329. 27. Ellis, A. J. and Mahon, W. A. (1966) “Geochemistry of the Ngawha hydrothermal area.” New Zealand J. Science 9. 28. EPA (2008) Drinking Water Health Advisory for Boron. Washington, DC: U.S. Environmental ...Jana S. Stojković. "Hidrogeohemijska valorizacija esencijalnih mikroelemenata mineralnih voda Srbije" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-09-25)
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Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources
Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...... language. CoRR abs/1209.4471 (2012). http:// arxiv.org/abs/1209.4471 18. Mladenović, M., Mitrović, J., Krstev, C., Vitas, D.: Hybrid sentiment analysis framework for a morphologically rich language. J. Intell. Inf. Syst. 1–22, to appear 19. Nadeau, D., Sekine, S.: A survey of named entity recognition ...
... Boncz, P., Brodie, M.L., Erling, O.: The meaningful use of big data: four perspectives-four challenges. ACM SIGMOD Rec. 40(4), 56–60 (2012) 2. Callan, J., Croft, W.B., Harding, S.: The inquery retrieval system, pp. 78–83 (1992) 3. Courtois, B., Silberztein, M.: Dictionnaires électroniques du français ...
... similarity of short texts in lan- guages with a deficient natural language processing support. Decis. Support Syst. 55(3), 710–719 (2013) 6. Graovac, J.: Wordnet-based serbian text categorization. INFOtheca 14(2), 2a–17a (2013) 7. Gross, M.: The use of finite automata in the lexical representation of ...Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović. "Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources" in Trans. Computational Collective Intelligence - Lecture Notes in Computer Science 26, Springer (2017). https://doi.org/10.1007/978-3-319-59268-8_8
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Production of morphological dictionaries of multi-word units using a multipurpose tool
The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...electronic dictionary, Serbian, morphology, inflection, multi-word units, noun phrases, query expansion... a ’ Gen= ‘=$g />j f e l o v a k u l a ’> j s k i r a d o v i ’>
... ID= ‘2 ’ Case = ‘1 ’ Num= ‘ p ’ />j s k o cvece ’> grammatical conditions, namely, that it is a ...
... no. 2, 2008. [6] C. Krstev and D. Vitas, “Finite State Transducers for Recognition and Generation of Compound Words,” in IS-LTC 2006, T. Erjavec and J. Žganec Gros, Eds. Ljubljana, Slovenia: Institut “Jožef Stefan”, October 2006, pp. 192–197. [7] A. Savary, “Multiflex: A Multilingual Finite-state ...Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas. "Production of morphological dictionaries of multi-word units using a multipurpose tool" in Proceedings of the Computational Linguistics-Applications Conference, October 2011, Jachranka, Poland, Jachranka, Poland : PTI - Polish Information Processing Society (2011)
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Развој геолошког терминолошког речника ГеолИССТерм
... ivni centar stude- nata, 486 str., Beograd.; Sedimentologija grubić, A., Obradović, J., vasić, N. 1996 Univerzitet u Beogradu, 436 str., Beograd.; International Stratigraphic guide. hedberg, h. D. (ed.) 1976 J. Wiley & Sons. - Inter- science publication, 200 str., New york; NASc (North American ...
... le maitre, r.W. (editor), Streckeisen, A., Zanettin, B., le Bas, m.J., Bonin, B., Bateman, P., Bellieni, g., Dudek, A., efremova, S., keller, J., lameyre, J., Sabi- ne, P.A., Schmid, r., Sørensen, h., and Woolley, A.r. 2002. Igneous rocks: A classification and glossary of terms, recommendations of ...
... Sons. mcguinness, Deborah. 2003. Ontologies come of Age. Spinning the Semantic Web: Bringing the World Wide Web to Its Full Potential, Dieter Fensel, J im hendler, henry lieberman, and Wolfgang Wahlster, editors. mIT Press. gillespie, m.r., & Styles, m.T., 1999. Classification of igneous rocks: Volume ...Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić. "Развој геолошког терминолошког речника ГеолИССТерм" in INFOteka: časopis za informatiku i bibliotekarstvo, Beograd : Zajednica biblioteka univerziteta u Srbiji (2011)
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Availability as a dimension of energy security in the Republic of Serbia
Boban Pavlović, Dejan Ivezić (2016)There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...... norm 1 , , 1, ,ij n ij i a A i j n a = = = ∑ (19) Next step is to determinate the criteria weight vector, wi, which is built by averaging the entries on each row of the normalised pairwise comparison matrix, Anorm: 1 , , 1,1 , n i ij j i jw na n = == ∑ (20) Obtained values ...
... of life to the whole society. References [1] Ren, J., Sovacool, B. K., Quantifying, Measuring, and Strategizing Energy Security: Determining the Most Meaningful Dimensions and Metrics, Energy, 76 (2014), Nov., pp. 838-849 [2] Cherp, A., Jewell, J., The Concept of Energy Security: Beyond the Four As ...Boban Pavlović, Dejan Ivezić. "Availability as a dimension of energy security in the Republic of Serbia" in Thermal Science, National Library of Serbia (2016). https://doi.org/10.2298/TSCI160923303P
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Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics
Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar. "Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics" in Clay Minerals, Mineralogical Society (2019). https://doi.org/10.1180/clm.2019.49
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2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem
... reactive extrusion. Energy Procedia, 56, pp. 547-554. ŠPERL, J. and TROČKOVA, J. (2008) Permeability and porosity of rocks and their relationship based on laboratory testing. Acta Geodynamica et Geomaterialia, 5 (1), pp. 41-47. THEMELIS, J. N. and PRISCILLA, A. U. (2006) Methane generation in landfills ...
... com/web [Accessed 13/04/19] LOKE, M.H. (2004) Tutorial: 2-D and 3-D electrical imaging surveys. Geotomo Software, Res2dinv 3.5 Software. MARKOVIĆ, J. and STEVOVIĆ, S. (2016) The process of creation and analysis of the landfill gas from the landfill in the region of Pchinja. Journal on Processing and ...Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov. "2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem" in Podzemni radovi, Centre for Evaluation in Education and Science (CEON/CEES) (2019). https://doi.org/10.5937/PodRad1934059S
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Classification of mining waste landfills according to legislation in Serbia
... 10/- nzsold_dam_safety_guidelines-may-2015-1.pdf, pristupljeno 19.09.2021. [15] Guerra, M. B. B, Teaney, B. T, Mount, B. J, Asunskis, D. J, Jordan, B. T., Barker, R. J, Santos, E. E. and Schaefer, C.E.G, Post-catastrophe analysis of the Fundão Tailings dam failure in the Doce River sy- stem ...
... L, Katalog otpada, Uputstvo za odre- đivanje indeksnog broja, Agencija za zaštitu životne sredine, Beograd, 2010 [22] Wahlström M, Laine-Ylijoki J, and Kaartinen T, Acid neutralization capacity of waste-specification of req- uirement stated in landfill regulations. Nordic Co- uncil of Ministers ...Dragana Nišić, Uroš Pantelić, Nikoleta Aleksić, Neda Nišić. "Classification of mining waste landfills according to legislation in Serbia" in Tehnika, Centre for Evaluation in Education and Science (CEON/CEES) (2021). https://doi.org/10.5937/tehnika2105575N
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Integrative GHG Assessment in Oil and Gas Industry
Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...... CO emission factor for gas flaring can be most accurately calculated by using the stoichiometric equation [8]: C.H,O. +[x+ _ Z)-oz » xCO, +[y]·H20 j 4 2 2 (6) where: X – stoichiometric cocfficient for carbon; y – stoichiometric cocefficicnt for hydrogen; z - stoichiometric coefficicnt for oxygen ...
... content of hydrocarbon compound can be calculated using the cquation [8]: 12 b C _ X Ib mole C Ib mole C_ Ib mole Cj ..{_P _ | b mole where: J - any hydrocarbon compound from Equation 6; 12 - molecular wcight of carbon; X - Stoichiometric cocfficient for carbon; Mw - molecular weight of ...
... ally calculated emission _ eS | factor, adjusted for combustion efficiency to Is flare gas composition - icci ; measurement available? |-|MČq*č—— j}| estimate CO> emlsslqn;. Estimate . uncombusted CHu by utilizing combustion efficiency Figure 1. Flare Gas Emissions- Decision Schema e> energija ...Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa. "Integrative GHG Assessment in Oil and Gas Industry" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.51M
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Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data
Vesna Cvetkov, Ilija Vasiljević, Mirko Petković. "Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data" in 5. Hrvatski geološki kongres. Abstract Book 5th Croatian Geological Congress, Hrvatski geološki institut (2015)
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Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike
... Voćarstvo, Vol. 40. br. 155 (2006, 3), 255–261. [6] Olga Mitrović, Branislav Zlatković, Miodrag Kandić, Jelica Gavrilović-Damnjanović, Branko Popović, Vladan Milinković (2009). Tehnološke karakteristike ploda nekih novih sorti šljive za sušenje, Journal of Pomology, 43, 167-168 (2009) 101-106. [7] Božović ...
... [7] Мулић, В., Мулић, Ј. (2019).ПРОПОРЦИОНАЛНА ТЕХНИКА-предавања, Зрењанин ВТШСС, , [8] Мулић, В., Мулић, Ј. (2019):ПРОПОРЦИОНАЛНА ТЕХНИКА-збирка задатака, Зрењанин ВТШСС, , [9] Мулић, В., Мулић, Ј. (2019)ПРОПОРЦИОНАЛНА ТЕХНИКА-практикум, Зрењанин ВТШСС, , [10] Петрић, Ј. (1998) Запис предавања ...
... fakultet Sveučilište u Zagrebu. Zagreb [6] Mulić, V. Mulić, J. 2019.PROPORCIONALNA TEHNIKA-predavanja, VTŠSS, Zrenjanin [7] Mulić, V. Mulić, J. (2019).PROPORCIONALNA TEHNIKA-zbirka zadataka, Zrenjanin, VTŠSS [8] Mulić, V. Mulić, J. (2019).PROPORCIONALNA TEHNIKA-praktikum, Zrenjanin, VTŠSS ...Мирослав Црногорац, Душан Даниловић, Лола Томић. "Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike" in IX Naučno stručni skup Preduzetništvo, inženjerstvo i menadžment Zrenjanin, 24.10.2020. god., Visoka tehnička škola strukovnih studija u Zrenjaninu (2020)
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Грешка инклинације код депозиционе реманетне магнетизације
Mirko Petković, Vesna Cvetkov (2019)... D., Jezek, J., & Kodama, K., (2011): Propagation and incorporation the error in anisotropy-based inclination corrections, Geophysical Journal International 187, 75-84 3. Butler, R., (2014): Paleomagnetism: Magnetic Domains to Geologic Terranes (Electronic Edition). 4. Hodych, J., & Bijaksana ...
... and correct for paleomagnetic inclination shallowing, Physics and Chemistry of the Earth 27, 1273 – 1279. 5. Jackson, M., Banerjee, S., Marvin, J., Lu, R., & Gruber, W., (1991) Detrital remanence, inclination errors, and anhysteretic remanence anisotropy: quantitative model and experimental ...Mirko Petković, Vesna Cvetkov. "Грешка инклинације код депозиционе реманетне магнетизације" in II Когрес геолога Босне и Херцеговине са међународним учешћем , Удружење геолога у Босни и Херцеговини (2019)
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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 ...... Life Cycle Assessment of Individual wood Biomass Heating Systems in Households 435 [15] Goedkoop, M., Oele, M., Vieira, M., Leijting, J., Ponsioen, J., Meijer, E. (2016.), SimaPro Tutorial, PRé, San Francisco, California.https://www.pre- sustainability.com/legacy/download/SimaPro8Tutorial.pdf ...
... Cycle Assessment, Environmental Management - Science and Engineering for Industry, Butterworth- Heinemann, Oxford, pp. 57-75. [12] Pryshlakivsky, J., Searcy, C.(2013).Fifteen years of ISO 14040: a review, Journal of Cleaner Production, Vol. 57, pp. 115-123. [13] Koroneos, C.J., Nanaki, E.A.(2012) ...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)
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Метода променљивих околина за решавање проблема p-центра са поузданом мрежом
У овом раду је разматран проблем p-центра са поузданом мрежом (енгл. Reliable p-center facility location problem - RpCFLP). Решавање проблема подразумева иницијално успостављање p ресурса и алокације корисника, као и накнадну реалокацију корисника у складу са новонасталим сценаријима који садрже информације о онеспособљеним ресурсима и осталим измењеним улазним подацима. За решавање посматраног проблема предложена је метахеуристика заснована на итеративној варијанти основне методе променљивих околина (енгл. Iterated basic variable neighborhood search - IBVNS). Резултати тестирања предложене метахеуристике указују на њену ...Јована Рађеновић, Стефан Мишковић, Оливера Станчић. "Метода променљивих околина за решавање проблема p-центра са поузданом мрежом" in 50. Међународни симпозијум о операционим истраживањима SYM-OP-IS, Тара, Србија, 18-21.9.2023, Београд : Медија центар „Одбрана” (2023)
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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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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 ...... period 2023-2040 | 120 · + E o [ % Hi 100 c = o ·š 20 j Projection emission without desulfurization H r_ M i L_ ___------">~ ~.~ E [] TT C--- ” TO------ u [ {average emission 86.424 tSO2) - period 2020-2040 | 80 F as 60 10 j 40 ——Total calorific value of used coal, GJ 57 Annual ...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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Smanjenje sleganja plitkih temelja primenom mikrošipova
Slobodan Ćorić, Dragoslav Rakić (2021)Mikrošipovi su šipovi malog prečnika koji se grade tako što se u tlu specijalni postupkom formira bušotina koja se zatim armira i injektira. Njihov prečnik je najčešće 150 – 300 mm, a dužina može da bude i više desetina metara. Mikrošipovi mogu da se grade u svim vrstama tla i mogu da budu vertikalni i kosi. Oni se, stoga, koriste kao zamena za konvencionalne šipove i ankere. Primena mikrošipova u fundiranju predstavlja jedan savremeni način izgradnje i sanacije temelja/objekata. ...Slobodan Ćorić, Dragoslav Rakić. "Smanjenje sleganja plitkih temelja primenom mikrošipova" in Zbornik radova međunarodno naučno-stručnog savetovanja Zemljotresno inženjerstvo i geotehnički aspekti građevinarstva, Vrnjačka banja, 3-5. novembar 2021., Beograd : Savez građevinskih inženjera Srbije (2021)