Претрага
569 items
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Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine
Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...... presented at the end. Energies 2019, 12, 4044 10 of 18 Table 3. Availability of analyzed machines. Years of Operation B1 B2 B3 t1, h t2, h A(t) t1, h t2, h A(t) t1, h t2, h A(t) N 1 519 20 0.96 0.96 934 25 0.97 0.97 753 37 0.95 0.94 2 1893 92 0.95 3004 128 0.96 3741 290 0.93 O 3 3372 334 0.91 0 ...
... Ristovic, I. Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining. Energies 2019, 12, 2245. [CrossRef] 23. Karimnia, H.; Bagloo, H. Optimum mining method selection using fuzzy analytical hierarchy process-Qapiliq salt mine, Iran. Int. J. Min. Sci. Technol. 2015, 25, 225–230 ...
... Conlon, J.C.; Lilius, W.A.; Tubbesing, F.H., Jr. Test and Evaluation of System Reliability, Availability and Maintainability, A Primer; No. DOD-3235.1-H; Department of Defense: Washington, DC, USA, 1982. 5. International Electrotechnical Commission. INTERNATIONAL STANDARD IEC—Dependability Management ...Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović. "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine" in Energies, MDPI AG (2019). https://doi.org/10.3390/en12214044
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Some models for determination of parameters of the soil oscillation law during blasting operations
... Figure 2. Graphic view of the polygonal line, N-1 of the trapezoid and curve v = K ¨ R´n. If: Ri`1 ´ Ri “ h “ RN ´ R1 N ´ 1 (19) then, for ST, the following value is obtained: ST “ h 2 rv1 ` 2 pv2 ` v3 ` . . . ` vN´1q ` vNs (20) If points Ri are not equally spaced, namely if: Ri`1 ´ Ri “ hi ...
... RR RR £R R Figure 2. Graphic view of the polygonal line, N-1 of the trapezoid and curve v = K- R™". If: Ry —R Rigi -Ri =h= a (19) then, for S7, the following value is obtained: h Srp = = [01 +2(v2 +03 +...+U0N-1) + UN] (20) 2 If points R; are not equally spaced, namely if: Rig1 -R; =; (i =1,2,.. ...
... ‚ Model 2 v2 “ 59.7588 ¨ R´1.5419 (29) ‚ Model 3 By using experimental data given in Table 1, where: R1 = 10.7722; RN = R10 = 30.1621; Ri+1 ´ Ri = h = 2.1544, according to the Equation (20) we obtain: ST = 12.9953 In this case for n = 1.5, according to Equation (25) we obtained the equation of the ...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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Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)
In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...Pavle Tančić, Aleksandar Kremenović, Predrag Vulić. "Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)" in Powder Diffraction, Cambridge University Press (CUP) (2019). https://doi.org/10.1017/S0885715619000897
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Numerical modeling of Selanac debris flow propagation using SPH code
The Selanac debris flow is a very huge event triggered after extreme rainfall caused by Cyclone Tamara activity in the Republic of Serbia in May 2014. The Selanac case study was already modelling in different programs using Voellmy rheology assumptions like RAMMS software. In this paper research are focusing particularly on the process of debris flowing from initiation zone to main deposition area using Geoflow SPH two-phase model considering frictional rheology law. Main rheological parameters are back-calculated using also ...... n of erosion rate, i.e. time derivative of the ground surface elevation, which is supposed equal the product of velocity (v), propagation height (h) and “landslide grow rate” (Er). The latter is independent to the flow velocity and is related by Hungr (1995) to the initial and final landslide volume ...
... (5) The erosion rate can be modelled as proportional to the product of velocity (v) and propagation height (h). 4 RESULTS DTM of 5x5m resolution is used as main topo file, with 133 452 points. Definition of the source area was made by comparing DTMs of different ...
... “Interplay of Rheology and Entrainment in Debris Avalanches: A Numerical Study.” Canadian Geotechnical Journal 51 (11): 1318–1330. Huang, Y., Cheng, H., Dai, Z. et al. (2015). ‘’SPH- based numerical simulation of catastrophic debris flows after the 2008 Wenchuan earthquake’’. Bull Eng Geol Environ ...Jelka Krušić, Biljana Abolmasov, Miloš Marjanović, Manuel Pastor, Saeid M. Tayyebi . "Numerical modeling of Selanac debris flow propagation using SPH code" in SCG-XIII International Symposium on Landslides. Cartagena, Colombia- February 22-26, 2021, International Society for Soil Mechanics And Geotechnical Engineering (2021)
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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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Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)
Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu. "Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)" in Carbonates and Evaporites, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s13146-020-00550-3
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Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria
The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijumaVladimir Krivošić, Luka Crnogorac, Rade Tokalić. "Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria" in Underground mining engineering, University of Belgrade - Faculty of Mining and Geology (2024)
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Sastav i teksture minerala FeO-Fe2O3-TiO2 sistema u vulkanskim stenama i porfirskim ležištima bakra Borske metalogenetske zone
Aleksandar Luković (2021)Proces obrazovanja minerala iz sistema FeO-Fe2O3-TiO2 u uzorcima vulkanskih stena i porfirskih orudnjenja borske zone prikazan kroz pojavu magnetita/hematita i njihovih alteracija. Minerali ove zone su ispitivani optičkim metodama (odbijena i propuštena svetlost), SEM-EDS/BSD, XRPD, LA-ICP-MS metodama. Rezultati ispitivanja su, pored glavnih Fe – Ti oksida, otkrili prisustvo ferijskog ilmenita u hornblenda andezitima I vulkanske faze kao i magnetita sa većim koncetracija Cr u zoni zlotske magnetne anomalije. Ispitivanje uzoraka iz bušotina porfirskih sistema borske zone otkriva postojanje nekoliko ...... Lindsley, D. H., (1962): Investigations in the system FeO-Fe2O3-TiO2. Yb. Carnegie Instn. Wash. 61, 100-6. Lindsley, D. H., (1965). Iron-titanium oxides. Carnegie Inst. Washington Yearb, 64, 144-148. Lindsley, D. H., (1991): Experimental studies of oxide minerals. In:Lindsley, D. H. (ed.) Oxid ...
... odnosu na istu refleksiju ovog minerala iz Krivelja (VK2002/01; publikovano u Luković et al., 2021). In te n z it e t I-H – ilmenohematit H-I – hemoilmenit Q – kvarc R – amfibol (ribekit?) P - plagioklas In te n z it e t 42 ...
... 13-30. Bojar, A. V., Neubauer, F., Fritz, H., (1998): Cretaceous to Cenozoic thermal evolution of the southwestern South Carpathians: evidence from fission-track thermochronology. Tectonophysics, 297, 229-249. 89 Bosi, F., Halenius, U., & Skogby, H., (2009): Crystal chemistry of the magnet ...Aleksandar Luković. Sastav i teksture minerala FeO-Fe2O3-TiO2 sistema u vulkanskim stenama i porfirskim ležištima bakra Borske metalogenetske zone, Beograd : [A. Luković], 2021
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Zbirka rešenih zadataka iz termodinamike
Marija Živković, Aleksandar Madžarević (2023)... Skica uz zadatak 39: Prikaz procesa u p-v dijagramu 116 ZBIRKA REŠENIH ZADATAKA IZ TERMODINAMIKE 56. Dimni gas molarnog sastava 12% CO 2 , 6% H 2 O , 5% O 2 i 77% N 2 , počet- nog stanja 0,9 MPa i 1000 °C izentropski ekspandira u turbini do pritiska 0,1 MPa, a zatim se izobarski hladi ...
... toplotu vodi tem- perature 25 °C, koja se pri stalnom pritisku 0,2 MPa zagreva do stanja su- vozasićene pare. Za maseni protok dimnih gasova 15000 kg/h, izračunajte snagu gasne turbine i maseni protok rashladne vode. REŠENJE: Molarni sastav je jednak zapreminskom sastavu, pa je: Gasna konstanta smeše ...Marija Živković, Aleksandar Madžarević. Zbirka rešenih zadataka iz termodinamike, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, 2023
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Paleomagnetic evidence for post-collisional Miocene clockwise rotation in the Serbian segment of the Vardar Zone and the Danubicum
Vesna Lesić, Emő Márton, Vesna Cvetkov, Dragana Tomić. "Paleomagnetic evidence for post-collisional Miocene clockwise rotation in the Serbian segment of the Vardar Zone and the Danubicum" in 26th IUGG General Assembly Prague, Czech Republic, International Union of Geodesy and Geophysics (2015)
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Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine
Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić. "Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945617
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Primena termografije u rudarstvu
Stevan Đenadić, Vesna Damnjanović, Predrag Jovančić, Dragan Ignjatović, Dragutin Jovković, Filip Miletić (2019)Danas, gotovo da nema oblasti u nauci i tehnici u kojoj se Infracrvena termografija ne primenjuje kao metoda za lociranje i praćenje zagrejanih objekata ili tela, beskontaktnu procenu temperature površina, i nedestruktivno ispitivanje materijala. U radu su prikazane mogućnosti i perspektive primene ove metode u oblasti rudarstva.... proseku, za rešavanje ovakvih problema potrebno je 4 do 6 h, što na kopu srednje veličine znači da se ne bi otkopalo materijala reda veličine nekoliko 104 t. U slučaju blagovremenog otkivanja greške ICT metodom, isti problem može rešiti za manje od 1 h. Nakon sprovedenih mera održavanja opreme, stručnjaci ...
... K., Inovative Run Flat System. Journal of KONES Powertrain and Transport, Vol. 22 (1) 299-306, 2015 [17] Ulah I., Yang F., Khan R., Liu L., Yang H., Gao B. & Sum K., Predictive Maintenance of Power Substation Equipment by Infrared Thermography Using a Machine-Learning Approach. Energies. Vol ...Stevan Đenadić, Vesna Damnjanović, Predrag Jovančić, Dragan Ignjatović, Dragutin Jovković, Filip Miletić. "Primena termografije u rudarstvu" in IX Međunarodna konferencija UGALJ 2019, Zlatibor, Srbija, 23-26. oktobar 2019., Jugoslovenski komitet za površinsku eksploataciju (2019)
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Indeksi kontrole održavanja i korišćenja rotornog bagera
Razvoj površinske eksploatacije se u velikom stepenu zasniva na svestranoj mehanizaciji rudarskih radova. Kako bi se zadovoljili potrebni kapaciteti, neophodna je primena savremene mehanizacije, velikih kapaciteta i pouzdanosti u radu. Naime, sa stepenom povećanja mehanizovanosti radova smanjuje se broj zaposlenih radnika, povećava produktivnost rada, smanjuju troškovi po jedinici proizvoda, a samim tim i povećava ekonomičnost površinske eksploatacije. Predmet istraživanja su rotorni bageri SRs 1200 koji predstavljaju samohodne mašine kontinuiranog dejstva namenjene za otkopavanje jalovine i korisne supstance na površinskim ...Jovana Mitrović, Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić. "Indeksi kontrole održavanja i korišćenja rotornog bagera" in XI Međunarodna konferencija "Ugalj i kritični minerali 2023", CCM 2023, Zlatibor, 11-14. oktobar 2023., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2023)
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Split-Desktop software for the analysis of fragment size distribution of blasted rock mass
Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović. "Split-Desktop software for the analysis of fragment size distribution of blasted rock mass" in 9th International Conference Mining and environmental protection, Sokobanja, Serbia, 24 – 27. May 2023, Belgrade : University of Belgrade, Faculty of Mining and Geology (2023)
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Preparation, characterization and photocatalytic activity of lanthanum and vanadium co-doped mesoporous TiO2 for azo-dye degradation
Nešić Jelena, Manojlović Dragan D., Anđelković Ivan, Dojčinović Biljana, Vulić Predrag, Krstić Jugoslav, Roglić Goran (2013)Nešić Jelena, Manojlović Dragan D., Anđelković Ivan, Dojčinović Biljana, Vulić Predrag, Krstić Jugoslav, Roglić Goran. "Preparation, characterization and photocatalytic activity of lanthanum and vanadium co-doped mesoporous TiO2 for azo-dye degradation" in Journal of Molecular Catalysis A: Chemical 378, Amsterdam:Elsevier (2013): 67-75. https://doi.org/10.1016/j.molcata.2013.05.018
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Joint interpretation of paleomagnetic, structural and AMS results from the Vardar Zone of Serbia
Emo Marton, Marinko Toljić, Vesna Lesić, Vesna Cvetkov. "Joint interpretation of paleomagnetic, structural and AMS results from the Vardar Zone of Serbia" in 18th Meeting of the Central European Tectonic Studies Group (CETEG) & 25th Meeting of the Czech Tectonic Studies Group, 22-25th April, 2021, Terchová, Slovakia, Department of Geological Sciences, Masaryk University in cooperation with the Czech Geological Survey, IPE MU Brno and UK Praha (2021)
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Actual contamination of the Danube and Sava rivers at Belgrade (2013)
Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening... Water Supp. 7 (1989) 11 35. N. Huppert, M. Würtele, H. H. Hahn, Fresenius J. Anal. Chem. 362 (1998) 529 36. J. Albaiges, F. Casado, F. Ventura, Water Res. 20 (1986) 1153 37. D. Kolpin, E. Furlong, M. Meyer, E. M. Thurman, S. Zaugg, L. Barber, H. Buxton, Phar- maceuticals, Hormones, and Other Organic ...
... sodium chloride solution. Heavy metal determination in sediments Prior to heavy metal analysis, the sediment samples were dried at 110 °C for 24 h. After drying, the sediments were subjected to mechanical homogenization by grounding to a powder. Then, aliquots of 0.5 g of dry sediments were digested ...
... 330 (2004) 249 13. P. Literathy, F. Laszlo, Water Sci. Technol. 32 (1995) 125 14. A. K. T. Kirschner, G. Kavka, B. Velimirov, R. Mach, R. Sommer, A. H. Farnleitner, Water Res. 43 (2009) 3673 15. V. Micic, T. Hofmann, Environ. Pollut. 157 (2009) 2759 16. A. Saliot, C. C. Parrish, N. Sadouni, I. B ...Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer. "Actual contamination of the Danube and Sava rivers at Belgrade (2013)" in Journal of the Serbian Chemical Society, National Library of Serbia (2014). https://doi.org/10.2298/JSC131105014A
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Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica
Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and TechnologyNatalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel. "Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica" in International Soil and Water Conservation Research, Elsevier BV (2019). https://doi.org/10.1016/j.iswcr.2018.12.004
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Mineral Resources of Serbia: Environmental, Societal and Economic Challenges
... and NCAR) under two scenarios (A1B and A2) for the year 2050 for ten locations (E-EKCHAM, H-HadCM, and N-NCAR) Sowing - Anthesis Sowing - Maturity 2050 2050 Loc. | AIB A2 AIB A2 E H N E H N E H N E H N CU |-7 -9 -8 -7 || -7 -7 -8 -9 -6 -9 -6 DM | -II -13 -9 -13 6 |-II -11 -14 -10 -13 -I6 ...
... Limitations for Bioenergy Use.” Waste Management 30 (10): 1889-—97. doi:10.1016/j.wasman. 2010.04.016. Silitonga, A. S., H. H. Masjuki, T. M. L. Mahlia, H. C. Ong, W. T. Chong, and M. H. Boosroh. 2013. “Overview Properties of Biodiesel Diesel Blends from Edible and Non-Edible Feedstock.” Renewable and ...
... under the A1B and A2 IPCC scenarios 2050 Absolute change in air temperature (*C) | Relative change in precipitation (%) AIB A2 AIB A2 E H N E H N E H N E H N CU | 2.8 3.9 2.5 34 48 |3.0 |-33.9 | -22.9 | -31.8 | -39.1 | -26.7 | -36.8 DM | 2.8 |4.0 2.5 34 49 |3.0 «|-38.1 | -22.6 | -40.9 | -43.8 ...Vladimir Simić, Rade Jelenković, Dragana Životić. "Mineral Resources of Serbia: Environmental, Societal and Economic Challenges" in Serbia: Current Issues and Challenges in the Areas of Natural Resources, Agriculture and Environment,, Nova Science Publishers, Inc. (2019)
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Fuzzy expert analysis of the severity of mining machinery failure
Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy expert analysis of the severity of mining machinery failure" in Applied Soft Computing, Elsevier BV (2020). https://doi.org/10.1016/j.asoc.2020.106459