Претрага
4853 items
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Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija
Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić (2015)Biougalj se dobija pirolizom iz organskog otpada. Smatra se ,,modifikatorom'' zemljišta i koristi se kao đubrivo i kao rezervoar za skladištenje ugljenika. Kvantifikacija funkcionalih grupa je važna zbog hemijske reaktivnosti biougljeva koji imaju uticaj na svojstva zemljišta. U istraživanju su korišćena 3 uzorka biouglja različitog porekla i jedan referentni, aktivni ugalj. Sadržaj kiselih funkcionalnih grupa je određivan titracijom po Boehm-u na dva načina: uvođenje N2 tokom titracije i tretman sa BaCl2. Optimizovan je način pripreme tri Boehm ova rastvora ...... aktivni ugalj. Sadr2aj kiselih funkcionalnih grupa je odredivan titracijom po Boehm-u na dva natin: uvodenje Nz tokom titracije i tretman sa BaCl. (1). Optimizovan je natin pripreme tri Bochm- ‘ova rastvora (NaOH, Na:COs, NaHCOs, koncentracije 0,05 mol/dm*). Ispitivan je na¢in pripreme standardnog ...
... sample. Oxygen surface ‘groups were determinated by Boehm titration in two manners: sparging with Nz during titration and the treatment with BaCl.(1]. The preparation of three Boehm’s solutions was optimized (NaOH, Na:COs, NaHCOs, conc. 0,05 mol/dm*). The preparation of the NaOH standard solution ...
... ‘This work was funded by the Ministry of Education, Science and Technological Development od the Republic of Serbia, Project No. 172051 Reference 1. Rivka B. Fidel, David A. Laird, Michael L. Thompson, Journal of Environmental Quality 42 (2013) 1771-1778 ...Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić. "Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija" in 52. savetovanja Srpskog hemijskog društva, Srpsko hemijsko društvo (2015)
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Ventex: an expert system for mine ventilation systems analysis
roblems relating to mine ventilation systems analysis are usually of a very complex nature. They involve the estimation of numerous interdependent parameters pertaining to the network status, ventilation status, ventilation system stability, air current losses, climate conditions, gas state, fire risk and dangerous dust pollution risk. The solution to these problems relies, to a great extent, on numerical methods. With the development of computer technology these methods were incorporated as numerical routes in software packages, such as the mine ...Nikola Lilić, Ranka Stanković, Ivan Obradović. "Ventex: an expert system for mine ventilation systems analysis" in Mining Technology, United Kingdom (1997)
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Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia
The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...Jelka Krušić , Biljana Abolmasov, Miloš Marjanović. "Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia" in Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-60706-7_25
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Parametri zbijanja komunalnog otpada određeni različitim laboratorijskim metodama
Jovana M Janković Pantić, Dragoslav R Rakić, Irena G Basarić Ikodinović, Tina D Đurić, Snežana Bogdanović (2021)Zbijanje komunalnog otpada predstavlja jednu od osnovnih faza korišćenja komunalne deponije. Zbog toga je kao i kod drugih nasutih građevina, veoma korisno odrediti parametre zbijanja: maksimalnu suvu zapreminsku težinu (dmax) i optimalnu vlažnost (wopt). Dobijeni rezultati mogu da posluže prilikom projektovanja kapaciteta deponije kao i prilikom definisanja obradivosti otpada. U dosadašnjoj praksi najčešći način određivanja parametra zbijanja je standardna metoda (Proktorov opit) koja se koristi u mehanici tla, uz eventualnu redukciju energije zbijanja. Međutim, različiti tretmani komunalnog otpada na ...... šiljcima prikazane su na slici 9. о | | 0-1 pre izvođenja opita — — U-I nakon izvođenja opitaj a — 98 ||——U-?Preizvođenja opita 1 ; % љо | | — U-akomizvođenja opitaj ! ı -88 . з % e — || = Ћ %|-- J —+ =- || i < 8 4 з0 # ' [ 20 10 } o — 0.01 о 1 10 100 prečnik sitinih о D (mm) Slika ...
... SRBIJE UDK: 624(059) ISSN 0352-2733 COBISS.SR – ID 43031 GRAĐEVINSKI KALENDAR 2020 Građevinski kalendar, Vol. 52 Beograd, mart 2021, p. 1-1Х, 1-67 Јоуапа Janković Pantić, dipl. inž. geol.! Prof. dr Dragoslav Rakić, dipl. inž. geol.? Irena Вазатте Ikodinović, dipl. inž. građ.ž Tina Đurić ...
... konačnog odlaganja (Tabela 1). Ропоупа upotreba komunalnog otpada uticala је na povećanje maksimalne suve zapreminske težinc i optimalnc vlažnosti, odnosno da је vlažni deo Proktorove krive za više puta zbijani komunalni otpad, znatno БИЖ liniji (krivi) zasićenja [4]. Тађеја 1. Рагатет zbijanja komunalnog ...Jovana M Janković Pantić, Dragoslav R Rakić, Irena G Basarić Ikodinović, Tina D Đurić, Snežana Bogdanović . "Parametri zbijanja komunalnog otpada određeni različitim laboratorijskim metodama" in Građevinski kalendar, Savez građevinskih inženjera Srbije (2021)
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The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines
In this paper we present how resources and tools developed within the Human Language Technology Group at the University of Belgrade can be used for tuning queries before submitting them to a web search engine. We argue that the selection of words chosen for a query, which are of paramount importance for the quality of results obtained by the query, can be substantially improved by using various lexical resources, such as morphological dictionaries and wordnets. These dictionaries enable semantic ...LR web services, MultiWord Expressions & Collocations, Information Extraction, Information Retrieval... on the following content: Sastojci za 10 porcija: 3 glavice crnog luka, 1 šoljica ulja, 1/2 čaša belog vina, 1 čaša soka od paradajza (The ingredients for 10 portions: 3 onions, 1 cup of oil, ½ glass of white wine, 1 glass of tomato juice.) This false retrieval occurs because two constituents ...
... The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines Cvetana Krstev 1 , Ranka Stanković2 , Duško Vitas 3 , Ivan Obradović4 1 professor, Faculty of Philology, Belgrade, 2 assistant, Faculty of Mining and Geology, Belgrade 3 professor, Faculty of ...
... these examples show that the number of documents obtained through a query by using our approach can double and even quadruple in some cases. 1. Introduction When delivering a query to a web search engine the user is typically interested in information available on the web related to a ...Krstev Cvetana, Stanković Ranka, Vitas Duško, Obradović Ivan. "The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines" in LREC 2008: Conference on Language Resources and Evaluation, Marrakesh, Morocco, May 2008, European Language Resources Association (ELRA) (2008)
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Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)
Miloš Radonjić (2020)This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides... avec les autres flores du Culm des Vosges.– Bulletin Sci- ences Géologiques, 26/1, 43–68. doi: 10.3406/sgeol.1973.1425 DABER, R. (1959): Die Mittel-Visé-Flora der Tiefbohrungen von Doberlug-Kirchhain.– Geologie, 8/26, 1–83. Berlin. DIMITRIJEVIĆ, M.D. (1997): Geology of Yugoslavia.– Geological Institute ...
... Ltd., London, 205 p. doi: 10.1201/b15204 STPANEK, J. & GEYER, G. (1989): Spurenfossilien aus dem Kulm (Unterkarbon) des Frankenwaldes.– Beringeria, 1, 1–55. UCHMAN, A. (2004): Phanerozoic history of deep-sea trace fossils.– In: MCILROY, D. (ed.): The Application of Ichnology to Palaeoenvironmental ...
... von Nötsch und der Hochwipfel-Formation der Karnischen Alpen (Österreich).– Jb. Geol. B.-A., 135/1, 195–216, Wien. VAN AMEROM, H.W.J. & KABON, H. (1999): Neue fossile Floren aus dem Nötscher Karbon (1. Teil).– Carinthia II, 189/109, 637–672, Klagenfurt. VAN AMEROM, H.W.J. & KABON, H. (2000): Neue ...Miloš Radonjić. "Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)" in Geologia Croatica, Croatian Geological Survey (2020). https://doi.org/10.4154/gc.2020.13
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Uticaj finoće mlevenja rude rudnika Grot na tehnološke rezultate
Ivana Božović (2024)Diplomski rad sa temom „Uticaj finoće mlevenja rude rudnika Grot na tehnološke rezultate” sastoji se iz dva dijela, opšteg i eksperimentalnog. U opštem dijelu prikazani su: * Istorijski razvoj rudnika „Grot”; * Geografski položaj rudnika „Grot”; * Geološke karakteristike ležišta; * Mineralni sastav i strukturno-teksturne karakteristike; * Prikaz postupaka pripreme mineralnih sirovina koji se primjenjuje u pogonu; * Opis šeme procesa; U drugom dijelu ovog završnog rada prikazani su rezultati eksperimentalnih ispitivanja koja su obuhvatila: uzorak, mineralnu sirovinu, hemijske analize i tehnološka ispitivanja. Na kraju ovog rada dati ...... rude Grot |I ||zs3|3| } 0:d| || || dj| |a| |2 |:3]||B}|3||za || | |1||||||||| II |1111|||||| ||LII JIB ||BB1|Y| || H| B -B 50 iH | |5 |I B | || 1|1| 5 10 15 Vreme mlevenja, min % kl as e - 0 , o 7 4 m m 20 Dijagram.1. Kriva meljivosti rude rudnika “Grot” 4.3 fFlotacijska koncentracija ...
... i reagenasa u g/t prerađene rude NaCn ZaSO, DOW CaO CuSOQux KAX KEX 45 230 55 2400 100 40 4 Opit 1 – Pogonski uslovi – Finoća mlevenja 70% – 0,074 mm Mlevenje Uzorak [kg] 1 Odnos Č:T 1:0,42 CaO |{kg/t| 1,4 NaCN [g/tl 45 ZnSO4 |g/t] 230 Vreme mlevenja |min]| 11,5 Finoća mlevenja [% ...
... njihovi rezultati su prikazani u elaboratu, sa stanjem na dan 31.12.2015. kojim su bilansirane do tada registrovane geološke rezerve (tabela 1). Tabela 1. Geološke rezerve u ležištu Blagodat, stanje 31.12.2015. godine B 3. 43 e Bare·Davol]awdedcal 232.508 _| __4,97 | ___568 | _11.558,60 | 13 ...Ivana Božović. Uticaj finoće mlevenja rude rudnika Grot na tehnološke rezultate, 2024
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Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije
Marina D. Ćuk (2018-02-23)Osnovni cilj doktorske disertacije predstavljao je definisanje prirodnih koncentracija (engl. background values) U, Th, i K u podzemnim vodama, i definisanje hidrogeohemijskih uslova koji utiču na distribuciju navedenih elemenata u podzemnim vodama...prirodni radioaktivni elementi, podzemna voda, geohemijske sredine, hidrogeohemijski uslovi, neparametarska statistička analiza, logistički model, hidrohemijsko modeliranje... Bj - Bj-1 - Aj-1 48 Računanje pozicije na dijagramu: Za osmatrane (detektovane) podatke, za i=1 do Aj: pdi= (1 – pej) + ( 𝑖𝐴𝑖+1) ∙ (pej – pej+1) Za cenzurisane podatke, i=1 do Cj: pci = ( 𝑖𝐶𝑗+1)∙(1-pej), kada je i=1 do Aj: pdi =(1 – pej) + ( 𝑖𝐴𝑗+1)∙(pej – pej+1) Regresiona ...
... Mg-HCO3 6 Na-Ca-HCO3 8 Ca-Na-HCO3-Cl 11 Mg-Ca-HCO3 13 Na-Ca-HCO3-Cl 3 Ca-Mg-HCO3 12 Mg-Ca(Na)- HCO3-SO4 1 Na-HCO3-Cl 10 Ca-Mg-HCO3- SO4 1 Mg-Na-HCO3- SO4 1 Na-HCO3-SO4 6 Ca-Na-HCO3-Cl 1 Mg-Na-HCO3 4 Na-Mg(Ca)- HCO3 7 Na-Mg(Ca)- HCO3-Cl 2 UKUPNO 95 35 25 Najveći broj ...
... imaju poreklo iz različitih populacija (Kruskal and Wallis 1952). Statistika testa H se može iskazati jednačinom: H = (𝑁 − 1) ∑ (𝑟𝑖−𝑟)2𝑔𝑖=1∑𝑔𝑖=1 ∑ (𝑟𝑖𝑗−𝑟)2𝑛𝑖𝑗=1 Gde je: H- statistika K-W testa N – ukupni broj opservacija u svim uzorcima ni – broj opservacija u grupi i rij–rank ...Marina D. Ćuk. "Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2018-02-23)
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Transboundary Karst and Karst Aquifers in West Stara Planina Mts – Characteristics and Problems
Benderev Aleksey, Stevanović Zoran, Mihaylova Boyka, Živanović Vladimir, Kostov Konstantin, Milanović Saša, Shanov Stefan, Jemcov Igor (2016)Benderev Aleksey, Stevanović Zoran, Mihaylova Boyka, Živanović Vladimir, Kostov Konstantin, Milanović Saša, Shanov Stefan, Jemcov Igor. "Transboundary Karst and Karst Aquifers in West Stara Planina Mts – Characteristics and Problems" in Karst without Boundaries. IAH - Selected Papers on Hydrogeology no. 23, Netherland:CRC Press/Balkema (2016): 71-86. https://doi.org/10.1201/b21380-8
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GIS supported bauxite deposit geological data as a tool for mining operations design
Milutinović Aleksandar, Ganić Aleksandar, Ganić Meri, Miljanović Igor. "GIS supported bauxite deposit geological data as a tool for mining operations design" in The Geology in Digital Age : proceedings of the 17th Meeting of the Association of European Geological Societies, MAEGS 17, Belgrade, [14-18. 09.] 2011 1, Beograd:The Serbian Geological Society (2011): 27-32
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Stabilization and monitoring of the slope deformation appearance on marl open-pit Filijala in order to minimize the risk of exploitation process interruption
Gojković Nebojša, Čebašek Vladimir, Ganić Aleksandar, Milutinović Aleksandar. "Stabilization and monitoring of the slope deformation appearance on marl open-pit Filijala in order to minimize the risk of exploitation process interruption" in V-th International geomechanics conference 1, Varna, Bulgaria:Scientific and Technical Union of Mining, Geology and Metallurgy (2012): 220-227
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Neogene geodynamics in the light of 3-D visualization – an example along the Sava River (Belgrade)
Ganić Meri, Knežević Slobodan, Rundić Ljupko, Milutinović Aleksandar, Ganić Aleksandar. "Neogene geodynamics in the light of 3-D visualization – an example along the Sava River (Belgrade)" in Proceedings of 17th Meeting of the Association of European Geological Societies 1, Beograd:Serbian geological Society (2011): 157-159
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Use of the 3D laser scanning while controlling the geometry of elements of bucket wheel escavator
Milošević Dragan, Pantić Marko, Stojaković Miša, Ganić Aleksandar, Milutinović Aleksandar. "Use of the 3D laser scanning while controlling the geometry of elements of bucket wheel escavator" in Energetsko rudarstvo, nove tehnologije, održivi razvoj : zbornik radova = Energy Mining, New Technologies, Sustainable Development : proceedings / III međunarodni simpozijum Energetsko rudarstvo 2010, 08-11. Septembar, 2010, Banja Junaković, Apatin = 1, Beograd:Rudarsko-geološki fakultet, Beograd (2010): 304-311
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Geochemical and Sedimentation History of Neogene Lacustrine Sediments from the Valjevo-Mionica Basin (Serbia)
Šajnović Aleksandra, Stojanović Ksenija, Simić Vladimir, Jovančićević Branimir. "Geochemical and Sedimentation History of Neogene Lacustrine Sediments from the Valjevo-Mionica Basin (Serbia)" in Geochemistry - Earth's System Processes, San Francisco State University, United States:Intech: The international journal of instrumentation and control, The Instrumentation, Systems and Automation Society (2012): 1-26. https://doi.org/10.5772/32180
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The importance of optical investigations for determination of the quality of architectural stones
Matović Vesna, Srećković Batoćanin Danica, Erić Suzana, Matović Nenad, Šarić Kristina. "The importance of optical investigations for determination of the quality of architectural stones" in Proceedings / 1th International Conference Harmony of Nature and Spirituality in Stone, 17-18 March 2011, Kragujevac, Belgrade:Stone Studio Association (2011): 113-124
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The East Serbian Paleocene alkaline rocks revisited: Evidence of decoupling of Sr-Nd and Pb isotopes in anorogenic setting
Cvetković Vladica, Šarić Kristina, Hoeck Volker, Prelević Dejan, Neubauer Franz, von Quadt Albrecht (2012)Cvetković Vladica, Šarić Kristina, Hoeck Volker, Prelević Dejan, Neubauer Franz, von Quadt Albrecht. "The East Serbian Paleocene alkaline rocks revisited: Evidence of decoupling of Sr-Nd and Pb isotopes in anorogenic setting" in International Earth Science Colloquium on the Aegean Region, IESCA-2012, 1-5 October. Abstracts, Izmir:Dokuz Eylül Üniversitesi (2012): 74-74
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Non-metallic resources as a significant additional coal open pits income, (possible $ scenario), kolubara coal mines, Serbia
Vučkovic Bogoljub, Nesic Duško, Bogdanović Vesna, Draško Zoran, Klemčić Goran. "Non-metallic resources as a significant additional coal open pits income, (possible $ scenario), kolubara coal mines, Serbia" in Proceedings 162th Annual Meeting of the Deutche Gesellschaft fur Geowissenschaften & 99th Annual Meeting of the Geologiche Vereinigung e.V. & 8th Europea Coal Conference, GeoDarmstadt 1, Darmstadt, Germany:Schriftenreihe der Deutschen Gesellschaft fur Geowissenschaften SDGG (2010): 582-582
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Application of a Complex Hydrodynamic Analysis in Assessing the Feasibility of Increasing Source Yield: Case Study of Podrum Palic (Serbia)
Polomčić Dušan, Parlić Srđan, Ristić-Vakanjac Vesna. "Application of a Complex Hydrodynamic Analysis in Assessing the Feasibility of Increasing Source Yield: Case Study of Podrum Palic (Serbia)" in Conference on Water observation and information system for decision support, 25-29 May 2010 Ohrid, Republic of Macedonia, Skopje, Macedonia:Faculty of civil engineering (2010): 1-10
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Preliminary analysis and monitoring of the road slope on the M-22 highroad near Ljig in Serbia using LIDAR data
Marjanović Miloš, Abolmasov Biljana, Đurić Uroš, Bogdanović Snežana. "Preliminary analysis and monitoring of the road slope on the M-22 highroad near Ljig in Serbia using LIDAR data" in Proceedings of XII IAEG Congress, Italy, Torino 2 no. 1, :Springer International Publishing (2014): 147-150. https://doi.org/10.1007/978-3-319-09057-
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Fuzzy model of a multigrade structure for support of decision-making and management in mineral processing
Vujić Slobodan, Miljanović Igor, Benović Tomo, Milutinović Aleksandar, Petrovski Aleksandar, Josipović Pejović Milena (2011)Vujić Slobodan, Miljanović Igor, Benović Tomo, Milutinović Aleksandar, Petrovski Aleksandar, Josipović Pejović Milena. "Fuzzy model of a multigrade structure for support of decision-making and management in mineral processing" in Proceedings of the 35th APCOM Symposium, Wollongong, Australia - no. -, Wollongong, Australia:University of Wollongong, Australia (2011): 485-490. https://doi.org/-