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Упит dcterms_subject_txt:MIS 5 to MIS 3

1894 items

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    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 ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... and downtime due to failures in the subsystem “construction”. Subsystem Failure of Element Number of Failures Time to Failure (h) Time to Repair (h) C o n st ru ct io n Belt construction bending 2 553, 1792 3, 7 Belt construction fracture 6 90, 192, 230, 295, 305, 1276 2, 4, 4, 5, 6, 8 Sieve plate ...
    ... = (1/0, 2/0.65, 3/0.65, 4/0.65, 5/0); Rengine = (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 ...
    ... Element Number of Failures Time to Failure (h) Time to Repair (h) F e e d e r Feeder oil leakage 2 1201, 3046 1, 2 Feeder support fracture 2 1113, 3478 2, 4 Feeder shaft fracture 2 2253, 3476 24, 40 Loading points fracture 2 1240, 2951 2, 5 Feeder oil overheating 3 897, 1036, 3325 1, 1.5, 2.5 ...

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    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 ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе
    ... 1.3 2.6 44 Ww 2.4 4.2 0.9 2.2 4 0.7 2 3.8 0.5 1.8 3.6 0.3 1.6 3.4 0.2 14 3.2 3 > ( ) 2011 2040, 2014 2070. 2071 2100. ( ) 0,25 x 0/29) ) ANN A1B 2011-2040 ANN A1B 2041-2070 ANN A1B 2071-2100 30 30 20 20 10 10 5 5 0 ) -5 -5 -10 -10 -20 -20 -30 -30 2011 2040, 2014 2070. 2071 2100. 0,25 x 0,;:2529)]) ...
    ... > 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 200.0 |} en » ...
    ... 100.0 —Tuzla 0.0 + | seeedes Zenic: 110.0 as S$ 8 8&8 S§ 8 8 $8 $$ FS 8B BS HF SF FF 8 3 8 $8 § &§ &$ 8 &€ 8 8 8 8 8 8 8 B = = = = = = = = = = = = = = = = a a a a a a a a a a a a a a a a >» 6. 10 > , 15. 30. 5. 2014. 5. 21. > > > > , _ . > > Intergovernmental Panel on Climate Changes) > > > [27]. ...

  • Extreme Rainfall Event and Its Aftermath Analysis—IPL 210 Project Progress Report

    Biljana Abolmasov, Mileva Samardžić Petrović, Ranka Stanković, Miloš Marjanović, Jelka Krušić, Uroš Đurić (2021)
    Landslides, Extreme precipitation, Data analysis, IPL project report

  • Evidence for Ladinian (Middle Triassic) platform progradation in the Gyulakeszi area, Tapolca Basin, Western Hungary: Microfacies Analysis and Biostratigraphy

    Zsolt Robert Nagy, Nevenka Đerić, Sándor Kovács, Anna Oravecz-Scheffer, Felicitász Velledits, Olga Piros, Gabor Csillag (2014)
    anizik, ladin, karbonati, litostratigrafija, biostratigrafija, konodonti, radiolarije, dijageneza
    ... layer due to the uniform size of carbonate particles. The angle between the lamination and the bedding is estimated to be < 5 degrees. Bioclasts mostly include abundant foraminifers, occasional fossil fragments without any large reworked oncoids. The thickness of the layer is about 1 to 3 centi- ...
    ... MFI: Fine bioclasltic cher·ty m·udf _ stone to wackestone witb yvadiolarians vnd filments Reitzi, Filaments are abundant compo- Tiepoldii Felsoeoersensis nents of the reddish-brown cherty lime- stone of the five samples (Fzsl to Fzs-5 on Fig. 3) collected on the cast side of the dirt road ...
    ... point to microerosional surface with dolosilt. Note the normal grading in the rudstone layer in 4/1 and in the intraclastic grainstone layer in 4/2-3. In addition, note the increasing amount of spar in the mid-section of 4/1. Sample and scale bar: 1 – Gy1_1, 10mm;2 — Gy2_3,5 mm; 3 – Gy2_2, 5 mm. 4) ...

  • Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings

    Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić (2018)
    ... equation we get : r0 = 3 √ 3Q 4π . (4) By replacing the value r0 from the Equation (4), in the Equation (3), we obtain: v = Kv   3 √ 3Q 4π r   n = Kv· ( 3 √ 3 4π )n · ( 3 √ Q r )n = Kv·K1· ( r 3 √ Q )−n = K· ( r 3 √ Q )−n = K·R−n, (5) whereas: ( 3 √ 3 4π )n = K1; Kv ...
    ... data given in Table 5, the equation of rock mass oscillation is calculated by the Equation (1)—by the models 1, 2 and 3. The calculation of the curve was carried out for values of reduced distances from R = 15.2808 to R = 45.0858. Thus, curve parameters were calculated enabling us to determine the equation ...
    ... comes down to equation: logv + 3 = −0.8891logR + 5.2588. (61) Figure 5 graphically represents the values of logarithms of the rock mass oscillation velocities and the logarithms of the reduced distances, whereby the logarithms of the rock mass oscillation velocity are increased by number 3. Minerals ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Multivarijabilni modeli upravljanja u rudarstvu

    Marjan M. Hudej (2014-02-03)
    osetljivost i rizik. Više pobuda generiše ovakvu atribuciju. Prva je, multivarijabilnostambijentalnih uslova i funkcionalna i strukturna složenost rudarskih sistema (čovek -priroda (radna sredina) - mašina – okruženje); Druga se odnosi na ne postojanje opštenaučne saglasnosti oko ocene pogodnosti modela za podršku odlučivanju i upravljanje.Treća, ako bi saglasnost i postojala, nije sigurno da bi raspoloživi modeli, metode i taktike,dale ekvivalentne rezultate za iste rudničke uslove. Četvrta, sistemske nauke još uveknemaju opšte prihvaćen i u praksi primenljiv algoritam izbora najboljeg rešenja ...
    rudarstvo, odlučivanje, upravljanje, model,multivarijabilno, multiatributno, multikriterijumsko
    ... K4 K5 K6 Min/max min min max max max max Te hn ol oš ko r eš en je A1 17,06 45,72 3 4 0 2 A2 19,52 48,05 3 4 0 2 B1 15,34 52,79 3 4 3 3,5 B2 17,79 55,14 3 4 3 3,5 C 17,67 34,16 5 5 5 2 D 10,57 49,77 4,5 5 4 3 E 6,69 55,68 4 5 4,5 5 Preferencija 0,3 0,3 0,1 0,1 0,15 0,05 Tabela ...
    ... max max max max max max Te hn ol oš ko r eš en je A1 0,058617 0,021872 3 4 0 2 A2 0,051230 0,020812 3 4 0 2 B1 0,065189 0,018943 3 4 3 3,5 B2 0,056211 0,018136 3 4 3 3,5 C 0,056593 0,029274 5 5 5 2 D 0,094607 0,020092 4,5 5 4 3 E 0,149477 0,017960 4 5 4,5 5 Suma 0,531924 0,147089 ...
    ... 1 0 V2 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 R a n g PK1 2 1 1 1 1 1 1 1 1 1 1 PK2 1 3 3 3 3 4 4 4 4 4 4 PK3 3 2 2 2 2 2 2 2 2 2 2 PK4 5 5 5 5 5 5 5 5 5 5 5 PK5 4 4 4 4 4 3 3 3 3 3 3 Marjan Hudej, doktorska disertacija: MULTIVARIJABILNI MODELI UPRAVLJANJA U RUDARSTVU ...

  • Multivarijabilni modeli upravljanja u rudarstvu

    Marjan M. Hudej (2014-02-03)
    osetljivost i rizik. Više pobuda generiše ovakvu atribuciju. Prva je, multivarijabilnostambijentalnih uslova i funkcionalna i strukturna složenost rudarskih sistema (čovek -priroda (radna sredina) - mašina – okruženje); Druga se odnosi na ne postojanje opštenaučne saglasnosti oko ocene pogodnosti modela za podršku odlučivanju i upravljanje.Treća, ako bi saglasnost i postojala, nije sigurno da bi raspoloživi modeli, metode i taktike,dale ekvivalentne rezultate za iste rudničke uslove. Četvrta, sistemske nauke još uveknemaju opšte prihvaćen i u praksi primenljiv algoritam izbora najboljeg rešenja ...
    rudarstvo, odlučivanje, upravljanje, model,multivarijabilno, multiatributno, multikriterijumsko
    ... K4 K5 K6 Min/max min min max max max max Te hn ol oš ko r eš en je A1 17,06 45,72 3 4 0 2 A2 19,52 48,05 3 4 0 2 B1 15,34 52,79 3 4 3 3,5 B2 17,79 55,14 3 4 3 3,5 C 17,67 34,16 5 5 5 2 D 10,57 49,77 4,5 5 4 3 E 6,69 55,68 4 5 4,5 5 Preferencija 0,3 0,3 0,1 0,1 0,15 0,05 Tabela ...
    ... max max max max max max Te hn ol oš ko r eš en je A1 0,058617 0,021872 3 4 0 2 A2 0,051230 0,020812 3 4 0 2 B1 0,065189 0,018943 3 4 3 3,5 B2 0,056211 0,018136 3 4 3 3,5 C 0,056593 0,029274 5 5 5 2 D 0,094607 0,020092 4,5 5 4 3 E 0,149477 0,017960 4 5 4,5 5 Suma 0,531924 0,147089 ...
    ... 1 0 V2 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 R a n g PK1 2 1 1 1 1 1 1 1 1 1 1 PK2 1 3 3 3 3 4 4 4 4 4 4 PK3 3 2 2 2 2 2 2 2 2 2 2 PK4 5 5 5 5 5 5 5 5 5 5 5 PK5 4 4 4 4 4 3 3 3 3 3 3 Marjan Hudej, doktorska disertacija: MULTIVARIJABILNI MODELI UPRAVLJANJA U RUDARSTVU ...

  • 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)
    equipment selection, mine mechanization, expert judgment, linguistic variables, MCDM, FAHP

  • An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction

    Dejan Ćebić, Nebojša Ralević, Marina Marčeta (2020)
    нелинеарна једначина, 16.ред конвергенције, оптималне методе, подељене разлике

  • Low-temperature phase transition and magnetic properties of K3YbSi2O7

    Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica
    ... Table 3 Selected bond lengths (Å) and angles (�) for �-K3YbSi2O7. K1—O1 2.8668 (3) �6 Yb1—O1ii 2.220 (2) �5 K1—O1i 3.032 (3) �3 Yb1—O1 2.221 (2) K2—O1 2.785 (3) �6 Si1—O1 1.615 (2) �3 K2—O2 3.3067 (3) �3 Si1—O2 1.6411 (17) O1—Si1—O1iii 110.65 (11) �3 Si1iv—O2—Si1 180.0 O1—Si1—O2 108.27 (11) �3 Symmetry ...
    ... � 6 0.502 � 5 1.025 � 3 2.06 0.088 � 3 0.501 O2 0.042 � 3 0.955 2.036 � ij (v.u.) 1.086 1.152 3.011 4.03 References for bond valence parameters: (a) Brown & Altermatt (1985), (b) Brese & O’Keeffe (1991). Table 5 Selected bond lengths (Å) and angles (�) for �0-K3YbSi2O7. K1—O1 2.842 (5) �2 K2—O3iii ...
    ... research papers Table 3 . Table 5 . Selected bond lengths (A) and angles (°) for B-K3YbSi,O7. Selected bond lengths (A) and angles (°) for B’-K3YbSi,O7. K1—O1 2.8668 (3) x6 Yb1—O1" 2.220 (2) x5 K1—O1 2.842 (5) x2 K2—03"! 2.938 (10) Ki—ol' 3.032 (3) x3 Yb1—O1 2.221 (2) K1—O1' 2.876 (5) x2 K2—03'" 3.489 (6) ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... absolute priority 8 1/8 (0.125) Higher priority 7 1/7 (0.143) High to higher priority 6 1/6 (0.167) High priority 5 1/5 (0.200) Moderate to high priority 4 1/4 (0.250) Moderate priority 3 1/3 (0.333) Equal to moderate priority 2 1/2 (0.500) Equal priority 1 1 (1.000) The result of elements pair-wise ...
    ... absolute priority 8 1/8 (0.125) Higher priority 7 1/7 (0.143) High to higher priority 6 1/6 (0.167) High priority 5 1/5 (0.200) Moderate to high priority 4 1/4 (0.250) Moderate priority 3 1/3 (0.333) Equal to moderate priority 2 1/2 (0.500) Equal priority 1 1 (1.000) The result of elements pair-wise ...
    ... 1/6 (0.167) High priority 5 1/5 (0.200) Moderate to high priority 4 1/4 (0.250) Moderate priority 3 1/3 (0.333) Equal to moderate priority 2 1/2 (0.500) Equal priority 1 1 (1.000) The initial assumption in this work is that the simplest and the most correct decisions are made when there are only two ...

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Оптимизација управљања процесима рекултивације површинских копова угља

    Bojan S. Dimitrijević (2014-05-30)
    Ширење површинске експлоатације минералних сировина а нарочито енергетских ресурсафосилних горива, чине површинске копове угља просторно доминантним објектима великих рударскихбасена како у нас тако и у свету. Експлоатациона активност, прати негативне еколошке утицаје наживотну средину шире околине, што нас обавезује на интегрално планирање, ревитализацију,рекултивацију и уређење нарушеног простора за његово поновно хумано коришћење упостексплоатационом периоду. Постексплоатационо санирање и уређење предела површинских коповаи одлагалишта односно нарушеног простора изазваног рударским радовима и пратећих објеката,представља синтетички мултидисциплинарно-интердисциплинаран веома комплексан вишефазниинжењерски пројектни задатак.У уводном ...
    рекултивација, постексплоатациони предео, површински коп угља,вишеатрибутна анализа, одлучивање, процеси, рекултивационо решење
    ... 8 = -3 1 s = 2 x = 5 - 8 = -3 1 s = 3 x = 5 - 8 = -3 1 s = 4 x = 5 - 8 = -3 1 s = 5 x = 5 - 9.5 = -4.5 1 s = 6 x = 5 - 2 = 3 0 s = 7 x = 5 - 8 = -3 1 s = 8 x = 5 - 2 = 3 0 s = 9 x = 5 - 9.5 = -4.5 1 s = 11 x = 5 - 2 = 3 0 a11, as x = k9(a11) - k9(as) P9(a11, as) ...
    ... = 10 x = 5 - 5 = 0 0 s = 11 x = 5 - 2 = 3 0 a7, as x = k7(a7) - k7(as) P7(a7, as) s = 1 x = 5 - 4 = 1 0 s = 2 x = 5 - 6 = -1 1 s = 3 x = 5 - 5 = 0 0 s = 4 x = 5 - 2 = 3 0 s = 5 x = 5 - 6.5 = -1.5 1 s = 6 x = 5 - 5 = 0 0 s = 8 x = 5 - 2 = 3 0 s = 9 x = 5 - 6.5 = -1 ...
    ... -1 1 s = 3 x = 5 - 4 = 1 0 s = 4 x = 5 - 2 = 3 0 s = 5 x = 5 - 8 = -3 1 s = 6 x = 5 - 8 = -3 1 s = 7 x = 5 - 8 = -3 1 s = 8 x = 5 - 2 = 3 0 s = 9 x = 5 - 8 = -3 1 s = 11 x = 5 - 2 = 3 0 a11, as x = k4(a11) - k4(as) P4(a11, as) s = 1 x = 2 - 2 = 0 0 s = 2 x = ...

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • Terminology Acquisition and Description Using Lexical Resources and Local Grammars

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Biljana Lazić (2015)
    Acquisition of new terminology from specific domains and its adequate description within terminological dictionaries is a complex task, especially for languages that are morphologically complex such as Serbian. In this paper we present an approach to solving this task semi-automatically on basis of lexical resources and local grammars developed for Serbian. Special attention is given to automatic inflectional class prediction for simple adjectives and nouns and the use of syntactic graphs for extraction of Multi-Word Unit (MWU) candidates for ...
    ... 8% occurring 3 to 5 times and 1.9% with more than 5 occurrences. The graph 3 (N2X) extracted 31% of all MWUs with frequency greater than 1. It is fol- lowed by graph 6 (NXN) with 26% MWUs, graph 4 (N4X) with 22%, graph 1 (AXN) with 16%, and the remaining six graphs with 6%. As to MWUs with frequency ...
    ... Example alica N 5 f - N650 97 95 98 sijalica alica N 5 f - N1650 97 1 1 Skalica alica N 5 f + N651 27 26 96 varalica alica N 5 f + N1651 27 1 4 Lalica ica N 3 m + N1683 145 142 98 Milojica ica N 3 m + N1741 145 3 2 Prica ica N 3 m/f + N683 40 33 83 tvrdica ica N 3 m/f + N679 40 7 18 ...
    ... English and German, related to theory and practice of librari- anship and information sciences and a wide range of close or related fields. Table 2. Frequencies of terms of different lengths in samples from 3 termbases Dictionary Term length (in number of words) 1 2 3 4 ≥5 GeolISS Term 1436 ...

  • 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 polynomials

  • Microstructural and magnetic properties of electrospun hematite/cuprospinel composites

    Mira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić (2020)
    Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...
    Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic Materials