Претрага
1000 items
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Fuzzy Model for Risk Assessment of Machinery Failures
The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...... 2, 3, 3, 3,4, 4, 4, 4.5, 4.5, 5, 5, 5, 6, 8, 8, 8, 8.5, 10, 10 Failure of structure of conveyor 15 31, 60, 79, 90, 105, 135, 217, 252, 255, 470, 500, 552, 782, 985, 1256 2, 3, 3, 3, 3, 4, 4, 4, 4.5, 4.5, 5, 6, 6, 7, 8 Drive head pulley 7 124, 192, 322, 477, 957, 1041, 2014 4, 4, 4, 5, 6.5, 8, 8 ...
... = (1/0, 2/1, 3/1, 4/1, 5/0); Relectrical system = (1/0, 2/0, 3/1, 4/1, 5/0); Rcrushing = (1/0, 2/1, 3/1, 4/1, 5/0); Rscreening = (1/0, 2/1, 3/1, 4/0, 5/0); Rtransport = (1/0, 2/1, 3/1, 4/0, 5/0); Rfeeder = (1/0, 2/0.65, 3/0.65, 4/0, 5/0); Rconstruction = (1/0, 2/0.65, 3/0.65, 4/0, 5/0). A min–max ...
... 2/0, 3/0, 4/0, 5/0.65, 6/0.65, 7/0.65, 8/0.65, 9/0, 10/0); R2 = (1/0, 2/0, 3/1, 4/0, 5/0.65, 6/0.65, 7/0.65, 8/0.65, 9/0, 10/0); R3 = (1/0, 2/0, 3/0, 4/0.75, 5/0.65, 6/0.65, 7/0.65, 8/1, 9/0, 10/0); R4 = (1/0, 2/0, 3/1, 4/0.65, 5/0.65, 6/0.65, 7/0.65, 8/0, 9/0, 10/0); R5 = (1/0, 2/0, 3/0, 4/0, 5/0, ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy Model for Risk Assessment of Machinery Failures" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12040525
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Flotability of chalcopyrite from the Rudnik deposit
Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...Đurica Nikšić, Predrag Lazić, Milena Kostović. "Flotability of chalcopyrite from the Rudnik deposit" in Journal of Mining Science, Springer Verlag (2021). https://doi.org/10.1134/S1062739121030170
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Хазард од клизишта у Србији у 21. веку
Biljana Abolmasov (2019)... > 1 >- > . > > > > 2 > > > . 15. 4 30. 5. 2014. > > > > > [26] ( >» 6) 550.0 +5 m0 Oe = = - =; 0.0 A || al Ve ["] I Ih sigs 500.0 t — 1s — ; 450.0 an ——+ 20.0 400.0 : 6 30.0 == “2 349.7_, 350.0 40.0" = Se ale lad = E i ee ra £ 300.0 500 £ --4 $ 3 250.0 4 J eosaa==4 “=| 600 & & - mania Average 5 —— Valje ...
... ������ 68 1. > [4] [5] > ( type of material) > ( type of movement) ( -) soil ( -) rock ( debris ( .) soul . / ( falling ( - rock fall ( debris fall earth ffall ( toppling . ( . rock ‘topple ( debris) toprle earth )ttopple O) Ke ql / ~ ( rock slump. debris) slun(p earth )glump / 4 ( rodk glfide. debris ...
... �����������. ���� �������� �� ������ 15. 4 � 30. 5. 2014. ��›����� ������� ›���� ��� �������� ›���›���� ����� �� ���›�� �������� [26] ( ��›� 6). ���›� 6. �������� ��� ����� ������� ›������� �������� �� 10 ›������� ������ � ������ � ���, �� ������ 15. 4 � 30. 5. 2014. 5. ������ �� �������� � ������ ...Biljana Abolmasov. "Хазард од клизишта у Србији у 21. веку" in Геохазард у Србији у 21. веку – знање је најбољи бедем против стихије, Српска академија наука и уметности (2019)
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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
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Named Entity Recognition for Distant Reading in ELTeC
Francesca Frontini, Carmen Brando, Joanna Byszuk, Ioana Galleron, Diana Santos, Ranka Stanković (2020)Akcija COST „Udaljeno čitanje za evropsku književnu istoriju“, koja je počela 2017. godine, ima među svojim glavnim ciljevima stvaranje višejezične zbirke evropskih književnih tekstova (ELTeC) otvorenog koda. U ovom radu predstavljamo rad koji je obavljen na ručnom označavanju selekcije ELTeC kolekcije za imenovane entitete, kao i na proceni postojećih alata za prepoznavanje imenovanih entiteta u pogledu njihove sposobnosti da automatski urade takve anotacije. U poslednjem paragrafu se razmatraju zajedničke tačke između ove inicijative i CLARIN-a.... 0 11 50 4 5 4 0 d e u 6 6 2 3 2 3 12 0 9 7 3 4 5 8 4 e n g 5 6 7 198 37 0 11 8 4 2 0 3 25 f ra 7 7 3 2 6 2 2 2 128 9 0 0 2 4 4 18 h u n 2 9 7 152 2 0 0 1091 3 6 7 7 n o r 4 8 83 25 3 9 9 0 2 01 10 p o r1 17 9 351 19 0 9 4 0 4 9 0 5 4 p o r2 3 4 1 2 5 6 3 0 7 1 05 9 3 4 7 7 slv 133 5 4 3 3 6 37 ...
... L O C 2 2 5 8 4 4 4 0 0 .3 3 8 0 .7 2 8 0 .6 6 2 P E R S 4 6 5 2 5 6 3 7 4 0 .5 5 4 0 .6 4 5 0 .4 4 6 P A L A V R A S -p o r 2 L O C 1 51 6 7 9 1 0 .6 2 4 0 .6 9 3 0 .3 7 6 P E R S 8 5 7 1 3 3 2 8 5 0 .7 5 0 0 .8 6 6 0 .2 5 0 S P A C Y -p o r2 L O C 1 5 7 5 7 3 9 6 0 .2 8 4 0 .7 3 4 0 .7 1 6 P E ...
... M - f r a L O C 7 3 1 1 2 8 4 0 .4 6 5 0 .3 9 5 0 .5 3 5 P E R S 8 2 5 1 2 1 1 5 0 .4 1 6 0 .1 3 8 0 .5 8 4 S P A C Y -f ra L O C 1 0 3 7 8 4 6 8 0 .1 8 0 0 .5 6 9 0 .8 2 0 P E R S 3 2 9 1 9 4 2 9 7 0 .5 2 6 0 .6 2 9 0 .4 7 4 P A L A V R A S -p o r 1 L O C 2 2 3 6 3 4 4 0 .8 3 5 0 .7 8 0 0 .1 6 5 ...Francesca Frontini, Carmen Brando, Joanna Byszuk, Ioana Galleron, Diana Santos, Ranka Stanković. "Named Entity Recognition for Distant Reading in ELTeC" in CLARIN Annual Conference 2020, Oct 2020, Virtual Event, France, CLARIN (2020)
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Specifičnosti fundiranja u lesnim naslagama – objekat Poreska uprava Zemun
Anja Dević (2024)U ovom završnom radu prikazani su literaturni podaci koji se odnose na geotehničke karakteristike terena izgrađenih od lesa na primeru šireg istražnog prostora, tzv. Zemunskog lesnog platoa, kao i rezultati detaljnih geotehničkih istraživanja na lokaciji objekta Poreske uprave Zemun. U prvom delu rada prikazani su uslovi nastanka karakteristične makroporozne strukture lesa i njen uticaj na fizičko-mehaničke karakteristike i stabilnost terena izgrađenih od lesa. Na osnovu analize i interpretacije rezultata detaljnih geotehničkih istraživanja na lokaciji objekta Poreske uprave Zemun prikazane su ...... |. = 0.244 = = . —> = . B/2 10 23 Aoga = 4* qn * l, = 4*52 * 0.244 = 50.75 kPa Za tačku A na dubini za = 3.2 + 1.5 + 5246 =7.5 m: L/2 139/2 ~ 69.5 B/2 „20/2 ~ 10 = 6.95 Ž _ 75 0.75 — I 0.217 = — = . -4 = . B/2 10 24 Aoza = 4*qn* l,, = 4*52*0.217 = 45.14 kPa Za tačku A na dubini zs ...
... 20/2 ~ 10 = 6.95 Z. 11 B/2 10 Aogs = 4*qn* l,,s = 4*52 *0.195 = 40.56 kPa Za tačku A na dubini ze = 3.2 + 1.5 + 5.6 + 1.4 + ** = 13.9 m: L/2 139/2 695 B/2 · 20/2 ~ 10 = 6.95 Ze _ 13.9 — _ -- – 1,39 s „ = 0.173 B/2 10 6 Aoze = 4*dqdn* Izx« = 4*52 *0.173 = 35.98 kPa Za tačku A na dubini ...
... —— =1.66— l,, = 0.154 B/? 10 Aozy = 4*qa * Iz, = 4*52 * 0.154 = 32.03 kPa Za tačku A na dubini zg = 3.2 + 1.8 +5.0+1.4+4.4+1+ 32—3 = 18.75 m: L/2 | 139/2 ~ 69.5 = = = 6.95 B/2 _ 20/2 10 Za 18.75 — _ __ – 1.875 — „ = 0.142 B/? 10 Aogg = 4*qn* Iz = 4*52 * 0.142 = 29.54 kPa Za tačku A na ...Anja Dević. Specifičnosti fundiranja u lesnim naslagama – objekat Poreska uprava Zemun, 2024
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Substitutional and positional disorder in Sr2.87Cu3.13(PO4)4
Karanović Ljiljana, Šutović Sabina, Poleti Dejan, Đorđević Tamara, Pačevski Aleksandar. "Substitutional and positional disorder in Sr2.87Cu3.13(PO4)4" in Acta Crystallographica Section C C66 no. 4, Rosenoerns Alle 1; PO Box 227; Copenhagen V, 1502; Denmark:Blackwell Munksgaard (2010): i42-i44. https://doi.org/10.1107/S0108270110007146
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Geotehnički uslovi rekonstrukcije Zavičajnog muzeja u Jagodini
Milan Tokanović (2024)U radu su prikazana geotehnička istraživanja za potrebe rekonstrukcije Zavičajnog muzeja Jagodina.Zavičajni muzej u ulici Kneginje Milice br.82 u Jagodini, ima ozbiljna oštećenja pojedinih delova konstrukcije koja su nastala na objektu tokom više od 80 godina eksploatacije.Kako bi se trajno rešio problem dinamičke stabilnosti i statičke održivosti konstruktivnog sistema objekta,neophodno je bilo definisanje geotehničkih uslova u zoni interakcije prirodne sredine i konstrukcije predmetnog objekta.Izvedena su terenska i laboratorijska ispitivanja na osnovu kojih su dobijene geotehničke podloge. Na osnovu dobijenih geotehničkih podloga ...geotehnička istraživanja, Zavičajni muzej, temelji, fundiranje, nosivost, sleganje, istražne jame, laboratorijska geomehanička ispitivanja, Jagodina... | 1.90 | 1.57 | 41.1 |0.697, 79.8 2 |4-2592) | J-4 2.10 12.6 | 32.4 | 20.7 | 11.6 | 1.7| CIL | 9 70|14B|2|0/|/0/0 2.68 4.82 | 6667 | 9524 |14815 29 13.7 | 1.80 | 1.60 | 40.4 |0.677, 50.0 3 |4-2590 | J-5 2.20 16.0 | 33.7 | 19.7 | 14.0 | 1.3| CIL | 10,64/14|8|4| 0|0 0 2.69 5.03 | 6250 | 8333 |11429 ...
... |11429 27 15.1 | 1.93 | 1.67 | 37.8 |0.608, 70.6 4 |4-2591 | J-3 2.50 22.8 | 35.5 | 19.3 | 16.1 | 0.8|CIM |11)76|7|4|2|0/|0/0 8696 | 9756 24 15.5 | 1.93 | 1.57 | 41.4 | 0.705, 86.5 l– E I“ GEOM d.o.o. Beograd, Kumodraška 328/1a. % Telefon : 011 2496 779, Fax : 011 3985 379 MC Lokacija laboratorije: ...
... international Adresa 10 avijatičara br. 4/27 Telefon Ugovor Početak 25.10.2021. Kraj ispitivanja 04.11.2021. Podaci o uzorku : Rb. |Bušotina i Dubina Vrsta materijala - uzorka Oznaka uzorka lab. br. od do 1 J-4 2.10 Neporemecen uzorak tla J-4 (2.10 - ) 14-2592 Napomena: Uzorkovanje ...Milan Tokanović. Geotehnički uslovi rekonstrukcije Zavičajnog muzeja u Jagodini, 2024
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Утицај обртног магнетног поља на дерацемизацију кристала натријум-хлората
... 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. Stefanidis, Crysf. Growth Des., 15 (2015) 5476–5484. [4] K. Suwannasang, A. E. Flood, C ...
... 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. Stefanidis, Crysf. Growth Des., 15 (2015) 5476–5484. [4] K. Suwannasang, A. E. Flood, C ...
... 11000 beozpao e-mail: andrijana(q)ff.bg.ac.rs BuynmaH puneHusr [1], npaMeHa yarrpaaByuHuax rTanaca [2], nonaBampe npumeca [3] HpoMecHa TeMmeparype [4] npencrTaBJbajy HeKc OJU HauHHa MepaueMMH3amuje KpHcTajla pacnMx H3 BOJIĆHMX pacTBOpa. Y OBOM pany OMhc nmpHMkaaaHM pe3ynrarm yrHmMaja porupajyher ...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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Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia
Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić (2023)Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive industry and the local community. On the example of the "Valjevo" B-Li deposit, data on structural settings and previous hydrogeological investigations were combined with the results of resource drilling and geophysical ...... „420, a w 7,424,000 7,426,000 7,428,000 7,430,000 » A NZ ELB drillhole 4, 91 0, 00 0 Water temperature *C 11 - 20 e 21-30 e 31-40 4, 90 8, 00 0 Cross section line 4, 90 6, 00 0 -| š 4, 90 2, 00 0 4, 90 0, 00 0 Figure 1. Location of the investigated area, basemap: OGK 1:100 ...
... for deposit exploration. 7,41?,000 7,418,000 ,422, 7,424,000 7,426,000 —. { 4, 91 0, 00 0 2N - 4, 90 8, 00 0 N = -ON a jE /Ž | aA Ž .;/ • - ELB drihole ———= Miocene base isoline 4, 90 4, 00 0 4 T; š Miocene basement a P Taž Limestone T2! Dolomitic limestone T, Limesotne ...
... map (Figure 4). 7,416,000 7,418,000 7,420,000 7,422,000 7,424,000 7,426,000 4, 90 8, 00 0 4, 90 6, 00 0 3 • ELB drilhole Geothermal gradient isoline Geothermal gradient map *Cilm 0.031 - 0.040 0.041 - 0.050 0.051 - 0.060 0.061 - 0.070 || 0.071 - 0.080 4, 90 4, 00 0 w E ganja ...Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić. "Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia" in Proceedings 9th International Conference mining and environmental protection, MEP23, Sokobanja, 24-27th May 2023, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet (2023)
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Effects of Energy Production and Consumption on Air Pollution in Serbia
Marija Živković (2019)Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...... pollution > A Chapter 2: Outlook for air pollution Se > A Chapter 3: Energy action for cleaner air 4 ~ QQ Part B: Country profiles 8 > A Chapter 4: United States 4 > A Chapter 5: Mexico Redact vo 2 = B16 ssn 4 Qa z& Q, Fill & Sign [BS send for Review More Tools > A Chapter 6: European a Union Biomass ...
... atmospheric pollution 4. The need to control atmospheric emissions of greenhouse and other gases and substances leads to the necessity of improving efficiency in energy production, transmission, distribution and consumption in the at the global level, or level of the country, region etc 4. Nowadays the most ...
... fourth-largest threat to human health, behind high blood pressure, dietary risks and smoking 4. Poverty and fossil fuel-intensive development and urbanization are determined as the main causes of air pollution 4. Emissions can be quantified at the level of total primary energy consumption, transformation ...Marija Živković. "Effects of Energy Production and Consumption on Air Pollution in Serbia" in Mining and Environmental Protection-MEP 2019, University of Belgrade, Faculty of Mining and Geology (2019)
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Development of integrated fuzzy model for mine management optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)... 134|0.324 | 0.677 A3 2 3 1 1 1 3 4 5 |0.212)0.394|0.744 A4 |0.33|0.5 1 0.2 | 0.95/0.3| 1 1 1 |0.062 0.104 | 0.225 Al 1 1 1 |0.33, 0.5 1 |0.25| 0.3 | 0.5} 1 2 3 |0.085|0.165 | 0.332 A2 1 1 1 1 a 4 5 |2 3 4 |0.231,0.435|0.786 A3 2 3 | 4 | 0.2 |0.25|0.33| 1 1 1 2 3 4 |0.171,0.315 | 0.564 A4 |0.25|0 ...
... 102 | 0.225 | 0.440 A5 2 3 | 4 |0.33| 0.5 1 1 1 |0.2|0.25|0.33|0.113 | 0.203 | 0.381 A4 1 2)|3 3 4 5 3 4 5 1 1 1 |0.256,0.472 | 0.841 Ka Al 1 1 1 1 2 3 |0.25| 0.3 |0.5| 1 2 3 |0.114,0.267|0.581 A2 |0.33|05)/ 1 1 1 1 1 2 3 1 2 3 |0.116,0.277 0.620 A3 2 3)|4 1 1 1 1 |0.3| 0.5 1 |0.128)0.252|0 ...
... with the largest “weight" re- Table ı Criteria analysis Crite- KI K2 K3 KA Wc}ght rion coefficients KI 1 1 1 4 5 6 4 5 6,7 Š ,0.375 0.538 | 0.774 K2 |0.17| 0.2 |0.95| 1 1 1 3 4)5)6,0.179 0.275 | 0.415 K3 }0.17} 0.2 } 0.25 | 0.25 | 0.33 | 0.5 1 1 1 |2,3,4,0.085 )0.135|0.212 K4 |0.13|0.14 ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of integrated fuzzy model for mine management optimization" in Comptes rendus de l'Académie Bulgare des Sciences (2023)
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Ontološki model upravljanja rizikom u rudarstvu
Olivera Kitanović (2021)Rudarska proizvodnja obuhvata kompleksne tehnološke sisteme, što nameće potrebu za uspostavljanjem i unapređivanjem sistema upravljanja rizikom. Heterogenost i obim podataka neophodnih za upravljanje rizikom zahtevaju sistem koji ih na fleksibilan način integriše i omogućava njihovo optimalno korišćenje. Osnovni cilj ove disertacije je razvoj ontologije za domen rudarstva i na njoj zasnovanog modela za upravljanje rizikom. Njegova realizacija podrazumeva i implementaciju algoritama ekstrakcije informacija za popunjavanje ontologije, kao i odgovarajuće softversko rešenje. Razvoj modela obuhvata i značajno proširenje rudarskog korpusa, kao ...rudarstvo, rizik, upravljanje rizikom, procena rizika, ontologija, semantička mreža, ekstrakcija informacija, upravljanje znanjem, računarska lingvistika... Slika 4-10. Slika 4-10 Konkordance u alatu Sketch engine Statistički prikaz frekvencija može se prikazati i grafički. Slika 4-10 prikazuje frekvencije pojave termina rizik sa pridruženim pridevima. 76 Slika 4-11 Frekvencije kolokacija za reč rizik u alatu Sketch engine Slika 4-12 prikazuje ...
... 63 Slika 4-4 Primer RDF serijalizacije termina iz oblasti rizika ...................................................................... 64 Slika 4-5 Veb alat za anotaciju teksta vrstom reči i lemom ........................................................................ 66 Slika 4-6 Deo panela ...
... Model for Ontologies (lemon)59(J. McCrae, Spohr, and Cimiano 2011; J. McCrae et al. 2012). Slika 4-4 daje primer RDF izvoza za kojim sledi Turtle RDF Syntax60 koja ilustruje upotrebu modela. Slika 4-4 Primer RDF serijalizacije termina iz oblasti rizika Napomenimo samo važnost povezivanja koncepata ...Olivera Kitanović. Ontološki model upravljanja rizikom u rudarstvu, Beograd : [O. Kitanović], 2021
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Effectiveness Analysis of Different Bucket-wheel Excavators
Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić. "Effectiveness Analysis of Different Bucket-wheel Excavators" in 8th International Conference Mining and Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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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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Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit
... equation: 3 3 4 orQ , from where there is: 3 4 3 Q ro . (3) By replacing the value ro from the equa- tion (3), in the equation, the following is obtained (2): n nn v nn v n v RK Q r K Q r KK r Q K r Q Kv 331 3 3 3 4 34 3 Whereas: 1 3 4 3 K n ; KKKv 1 ; ...
... eksploziva Q vezani su jedna- činom: 3 3 4 orQ , odakle je: 3 4 3 Q ro . (3) Zamenom vrednosti ro iz jednačine (3) u jednačini (2) dobijamo: n nn v nn v n v RK Q r K Q r KK r Q K r Q Kv 331 3 3 3 4 34 3 gde je stavljeno: 1 3 4 3 K n ; KKKv 1 ; R Q r 3 i gde ...
... po jednačini (4) u obliku: n RKv (4) parametar n možemo odrediti uzastopnim aproksimacijama uz primenu Lagranžove teoreme 8 . Ako zakon brzine oscilovanja stenske mase dat jednačinom (4) diferenciramo po R dobićemo: 1n RKnv , tj. n RK R n v . (5) Imajući u vidu (4), jednačina (5) ...Suzana Lutovac, Nebojša Vidanović, Čedomir Beljić, Zoran Gligorić. "Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit" in Mining and Metallurgy Engineering Bor, Bor : Mining and Metallurgy Institute Bor (2015). https://doi.org/10.5937/MMEB1503053L
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Development of an integrated model for open-pit-mine discontinuous haulage system optimization
Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović (2024)Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović . "Development of an integrated model for open-pit-mine discontinuous haulage system optimization" in Sustainability, MDPI (2024). https://doi.org/10.3390/su16083156
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Analiza pouzdanosti dozera angažovanih na površinskim kopovima RB Kolubara
U radu je izvršena uporedna analiza pouzdanosti transportnih sistema dozera koji rade na površinskim kopovima Rudarskog basena Kolubara. Period za koji je vršena analiza je prvih deset godina eksploatacije. Efikasnost tehnološkog procesa na otkopavanju korisne mineralne sirovine i otkrivke u velikoj meri zavisi od rada dozera. Iskorišćene su matematičke metode za aproksimaciju i identifikaciju zabeleženih vremena u radu, kako bi se dobili analitički pokazatelji pouzdanosti. Na ovaj način se bitno podiže kvalitet upravljanja procesom eksploatacije i održavanja mašina na ...... analize za dozer CAT D8R i 1 2 3 4 5 6 t, h 285,00 570,00 855,00 1140,00 1425,00 1995,00 t, 1000 h 0,285 0,57 0,855 1,14 1,425 1,995 N (t) 13 15 5 6 2 2 N (t) 13 28 33 39 41 43 n (t) 30 15 10 4 2 0 n (t-t) 43 30 15 10 4 2 MR, % 29,2627 63,8249 75 ...
... TD 25 H i 1 2 3 4 5 6 7 t, h 230,00 460,00 690,00 920,00 1150,00 1380,00 1610,00 t, 1000 h 0,23 0,46 0,69 0,92 1,15 1,38 1,61 N (t) 6 8 8 6 8 3 1 N (t) 6 14 22 28 36 39 40 n (t) 34 26 18 12 4 1 0 n (t-t) 40 34 26 18 12 4 1 MR, % 14,1089 ...
... izostali, dok je velike poteškoće u radu stvarala hidraulika. Procentualno učešće različitih otkaza za analizirane tipove dozera dato je na slikama 4 i 5. Slika 4. Najčešći otkazi na dozerima CATD8R i Liebherr PR 752 Slika 5. Najčešći otkazi na dozeru Dressta TD 25 H Za potrebe ovog rada biće izvršena analiza ...Filip Miletić, Dragan Milčić, Miloš Tanasijević, Miloš Milovančević. "Analiza pouzdanosti dozera angažovanih na površinskim kopovima RB Kolubara" in 10th International Conference Coal 2021, Jugoslovenski komitet za površinsku eksploataciju, Zlatibor (2021)
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Geonasleđe Golije i Peštera
Ljiljana V. Grujičić-Tešić (2017-09-01)Sprovedena istraživanja u ovoj studiji obuhvatila su izdvajanje, opis, evaluaciju i valorizaciju objekata geonasleđa u cilju razvoja istraživane oblasti sa stanovišta geonauka, geoturizma i geoekologije. Na izučavanom području objekti geonasleđa su evidentirani, interpretirani, vrednovani i kategorisani, dat je predlog promocije geoobjekata, i na kraju predložena dopuna inventara objekata geonasleđa Srbije.U protekle četiri godine, na kompleksu geotopa Golije i Peštera istražena su geološka svojstva stena (tip stene, starost, fosilni sadržaj, morfološke i hidrogeološke karakteristike itd.), na osnovu čega je bilo ...... 2 3 3 4 4 29 4 4 5 18 3 1 3 1 2 12 3 0 3 61,2 2 3 3 2 4 4 32 4 5 5 19 2 3 3 2 3 16 5 3 8 60 3 2 5 5 5 5 42 5 4 5 19 3 3 3 1 2 14 1 3 4 76 4 2 3 3 5 5 32 4 3 5 17 1 2 1 1 2 9 1 3 4 62,4 5 2 3 2 5 4 30 4 5 5 19 2 2 3 1 2 12 1 0 1 61,6 6 2 2 3 5 5 30 4 5 5 19 1 2 3 1 2 11 3 0 3 62,4 7 4 5 5 5 ...
... 5 4 45 5 5 5 20 3 3 3 3 3 18 2 3 5 88,4 8 3 5 4 2 5 35 3 5 5 18 3 3 3 2 2 15 1 0 1 69,2 9 4 5 4 5 4 44 4 5 5 19 2 2 3 1 2 12 2 3 5 81,6 10 4 5 3 5 4 43 4 5 5 19 1 2 3 1 2 11 2 3 5 79,6 11 4 5 3 5 4 43 4 5 5 19 2 2 3 1 2 12 2 3 5 80,4 12 3 5 2 5 4 38 4 4 5 18 2 1 2 1 1 8 2 0 2 68 Po te nc ...
... 13 3 0 3 76 7 2 3 4 4 4 30 3 5 5 18 3 3 3 3 2 16 3 0 3 65,6 8 2 4 4 3 4 30 5 5 4 18 1 2 3 3 2 13 3 0 3 63,5 9 3 4 4 5 0 34 4 5 5 19 3 3 3 1 2 14 2 0 2 68,8 10 3 3 3 5 0 31 4 3 5 17 1 2 1 2 2 8 2 0 2 58,8 11 2 4 5 5 4 35 5 4 4 17 2 2 3 1 3 14 3 0 3 69,2 12 2 5 5 5 3 36 3 2 5 15 3 2 3 2 3 16 ...Ljiljana V. Grujičić-Tešić. "Geonasleđe Golije i Peštera" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2017-09-01)
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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