Претрага
1295 items
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A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System
This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFISMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić. "A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System" in Energies, MDPI AG (2023). https://doi.org/10.3390/en16072958
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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: ...Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić. "Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals" in Review on advanced materials science, Walter de Gruyter GmbH (2020). https://doi.org/10.1515/rams-2020-0043
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Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex
Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males (2024)Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males. "Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex" in Annales geologiques de la Peninsule balkanique, National Library of Serbia (2024). https://doi.org/10.2298/GABP240116003S
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Assessment of environmental radioactivity and health hazard at Stara Planina region
Slavko Dimovic, Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Radoje Bankovic (2021)Циљ студије је био да се процени потенцијални ризик од зрачења у близини напуштених рудника уранијума, јаловишта или лежишта уранијума на Старој планини у Србији. За процену ризика одређено је неколико параметара: активност еквивалента радијума, Raeq, екстерни индекс опасности, Hex, брзина апсорбоване дозе гама зрачења, D, годишња ефективна доза на позадинској експозицији гама гама на отвореном, AEDoutdoor и ризик од рака током живота, ELCR. Добијени резултати су показали да сви узорци, осим једног, имају Raeq вредност и до два ...Slavko Dimovic, Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Radoje Bankovic. "Assessment of environmental radioactivity and health hazard at Stara Planina region" in Nuclear Technology and Radiation Protection (2021). https://doi.org/10.2298/NTRP2004354D
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Nonequilibrium athermal random-field Ising model on hexagonal lattices
Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević. "Nonequilibrium athermal random-field Ising model on hexagonal lattices" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.032147
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Crystal structure of K3EuSi2O7
alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu... ISBN:9780470985687) 3. A. M. Latshaw, W. M.Chance, N. Trenor, G. Morrison, M. D. Smith, J. Yeon, D. E. Williams, H.-C. zur Loye, CrystEngComm 17 (2015) 4691 (https://doi.org/10.1039/C5CE00630A) 4. A. M. Latshaw, K. D. Hughey, M. D. Smith, J. Yeon, H.-C. zur Loye, Inorg. Chem. 54 (2015) 876 (https://doi ...
... b) 5. A. M. Latshaw, B. O. Wilkins, K. D. Hughey, J. Yeon, D. E. Williams, T. T. Tran, P. S. Halasyamani, H.-C. zur Loye, CrystEngComm 17 (2015) 4654 (https://doi.org/10.1039/C5CE00671F) 6. A. M. Latshaw, G. Morrison, K. D. zur Loye, A. R. Myers, M. D. Smith, H.-C. zur Loye, CrystEngComm 18 ...
... Program available from www.CCP14.ac.uk 24. I. D. Brown, D. Altermatt, Acta Cryst. B41 (1985) 244 (https://doi.org/10.1107/S0108768185002063) 25. N. E. Brese, M. O’Keeffe, Acta Cryst. B47 (1991) 192 (https://doi.org/10.1107/S0108768190011041) 26. R. D. Shannon, Acta Cryst. A32 (1976) 751 (https://doi ...Sabina Kovač, Predrag Dabić, Aleksandar Kremenović. "Crystal structure of K3EuSi2O7" in Journal of the Serbian Chemical Society, National Library of Serbia (2021). https://doi.org/10.2298/JSC210218026K
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Opremanje bušotine X zavojnom pumpom
Milan Filipović (2024)Ovaj rad se bavi osnovnim pojmovima i karakteristikama zavojnih pumpi.Prikazan je sklop zavojnih pumpi i njena prateća oprema. Objašnjen je princip rada zavojnih pumpi kao i uloga svakog mašinskog elementa koji se nalazi u pumpi. Razmotrene su prednosti i nedostaci primene ovih primarnih mehaničkih metoda eksploatacije ugljovodonika. Dat je uvid u inovativna rešenja problematike primene zavojnih pumpi. Na konkretnom primeru bušotine X su prikazani problemi kao i rešenja primene ovih primarnih mehaničkih metoda u praksi. Napravljena je detaljna analiza ...... izračunati na sledeći način: 4ed,„O =0 a 2[ dr—;a:csin[z_*}'iž'_đ]_„/sq _0 [d—ž_ 5)] r (2.2) +4ed-86- z(0d—6%,6>0 4ed,- Seć- a(dd,- 6%,06<0 A — poprečni presek [m?] Š – faktor uklapanja [m] d, — prečnik rotora [m] d — prečnik statora [m] e — ekscentričnost [m] Nakon određivanja površine ...
... krive. Reservoir pressure: 67.5 bara i Reservoir temperature: 68 degcC . IPR basis: Liquid AOFP: 21.59047 sm3/d , Vogel coefficient: 0.8 Use test data: [v] Q Pwf Pws . sm3/d Y |bara Y |bara ” |_ |15.6 32.2 67.5 Slika 15 Ulazni podaci za IPR Na slici 16 je prikazana IPR kriva na kojoj ...
... atNA PatNA % 4 sm3/d · ~|bara , 5 1 |UNCONVERG.. LJ 2 PWSTATCC=84.. 01744064 — M461618 _P 3 |PWSTATIC=30,, 226063 | 845007 š i žs : fa 55 H 25 : 585 30 ||] HE HEJ 89 ž 15 10 5 ) ___ _, [| } li LJ [| L) 12 4 % 18 IJ Stock.tank liquid at nodal point (sm3/d) —— inflov: PWSTATIC=67 ...Milan Filipović . Opremanje bušotine X zavojnom pumpom, 2024
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Protection of lignite opencast mine Radljevo North from the water of river Pljostanica
Šubaranović Tomislav, Ivoš Vladimir, Pavlović Vladimir, Minić Zvonko. "Protection of lignite opencast mine Radljevo North from the water of river Pljostanica" in Proceedings of the XIV International conference of the open and underwater mining of minerals, Varna, Bulgaria:Scientific and technical union of mining, geology and metallurgy Bulgaria (2017): 350-354
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Cement sheath integrity control during well life
Bošković Zvonimir, Čebašek Vladimir, Mitrović Vladimir, Stanić Slobodan. "Cement sheath integrity control during well life" in Technics Technologies Education Management / TTEM (2010): 450-454
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Tangential stress in the well in the casing-cement stone-formation system
Čebašek Vladimir, Bošković Zvonimir, Mitrović Vladimir, Gojković Nebojša. "Tangential stress in the well in the casing-cement stone-formation system" in Technics Technologies Education Management / TTEM (2010): 495-501
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Radial stress and deformation of cement stone in the wells
Čebašek Vladimir, Bošković Zvonimir, Mitrović Vladimir, Gojković Nebojša. "Radial stress and deformation of cement stone in the wells" in Technics Technologies Education Management / TTEM (2010): 840-846
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Rock Stability Analysis On The Model Of Designed And Constructed Roadways In The Jama Bor
Zlatanović Dragan, Milisavlјević Vladimir, Tokalić Rade, Čebašek Vladimir. "Rock Stability Analysis On The Model Of Designed And Constructed Roadways In The Jama Bor" in Underground Mining Engineering - Podzemni radovi no. 26, :Univerzitet u Beograd - Rudarsko-geološki fakultet (2015): 35-47
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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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Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian
Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek (2021)Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek. "Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian" in Language and Text: Data, models, information and applications, John Benjamins Publishing Company (2021). https://doi.org/10.1075/cilt.356.04ruj
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Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2
Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...... k, Rapid Commun. Mass Spectrom., 1993, 7, 1090–1094. 43 D. C. Muddiman, A. I. Gusev, A. Proctor, D. M. Hercules, R. Venkataraman and W. Diven, Anal. Chem., 1994, 66, 2362–2368. 44 D. C. Muddiman, A. I. Gusev, K. Stoppeklangner, A. Proctor, D. M. Hercules, P. Tata, R. Venkataramanan and W. Diven, J ...
... 87, >60] | ] 5.04 {5 = a8} |s = D |= 2 3012| fo “oS 18 8 2018 mE 12 bec 1.0] 0 © © Zz S 0.0 Zz (=) on Fig.3 Ky, (A and C), Vinax (B and D) values obtained for phospho- lipase A, in the presence of different concentrations of [RuCl,(bipy)2]Cl (A-B) and [PtCl,(bipy)] (C—D). Experimental condi- tions are ...
... replacement of one neutral HCl molecule by H2O. Fig. 3 Km (A and C), Vmax (B and D) values obtained for phospho- lipase A2 in the presence of different concentrations of [RuCl2(bipy)2]Cl (A–B) and [PtCl4(bipy)] (C–D). Experimental condi- tions are described in the section: Preparations of samples ...Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković. "Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2" in Metallomics, Oxford University Press (OUP) (2011). https://doi.org/10.1039/c1mt00088h
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Optimizacija površinskog kopa Ciganuša – Škorac
Vasilije Zejak (2024)U radu se govori o značaju optimizacije u savremenom rudarstvu i kako nam to softveri štede vreme, novac i olakšavaju procese planiranja.Konkretno u izradi ovog rada korišćen je softverski paket Whittle.Da bi se optimizacije mogla uspešno sprovesti, potrebno je konstruisati pre svega blok model ležišta kao i definisati niz tehno – ekonomskih parametara. Na osnovu tih podataka definiše se optimalna kontura i dinamika razvoja radova. U skladu sa definisanim podaci i odgovarajućim podlogama definisana je optimalna kontura površinskog kopa Ciganuša ...optimizacija, površinski kop Ciganuša - Škorac, blok model, strateško planiranje, optimalna kontura, dinamika razvoja, fazni razvoj... radova (Stevanović D. , 2015)........... 25 Slika 3.3 Geološki blok model (Stevanović D. , 2015)......c.aaaaaaaananananannnnnnnn 28 Slika 3.4 Grid model ležišta sa generisanim slojevima (Stevanović D. , 2015) ...... 29 Slika 3.5 Metodologija eksplicitnog modeliranja (Stevanović D. , 20153) ...... ...
... razvoja (Stevanović D. , 2015)65 Slika 3.35 Prikaz faza razvoja na profilu (Stevanović D. , 2015) .....canan.. 65 Slika 3.36 Konture faza razvoja sa rudonosnim blokovima (Stevanović D. , 2015)65 Slika 3.37 Pojedinačni prikaz faza razvoja sa pripadajućim rudnim blokovima (Stevanović D. , 2015)..... ...
... otkopavanja -– Best case (Kržanović P. D., 2016)....... 68 Slika 3.39 Najgori Scenario otkopavanja -Worst case (Kržanović P. D., 2016) .....o8 Slika 3.40 Milawa NPV (Kržanović P. D., 2016).........c.aaaaaananaaaaaadnnnne 69 Slika 3.41 Milawa Balanced (Kržanović P. D., 2016).......c..aaaaananannnnnnn ...Vasilije Zejak. Optimizacija površinskog kopa Ciganuša – Škorac, 2024
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Metallogenic Implications of the High-Precision U-Pb Zircon Geochronology of Igneous Rocks from the Rogozna Skarn-hosted Au-Zn-Pb-Cu Project
Sean P. Gaynor, Milorad D. Antić, Vladica Cvetković, Kristina Šarić, Urs Schaltegger. "Metallogenic Implications of the High-Precision U-Pb Zircon Geochronology of Igneous Rocks from the Rogozna Skarn-hosted Au-Zn-Pb-Cu Project" in XXII International Congress of the Carpathian-Balkan Geological Association, Geologica Balcanica, Plovdiv, Bulgaria, 7–11 September 2022, Geological Institute, Bulgarian Academy of Sciences (2022)
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Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova
Zoran M. Štirbanović (2015-07-01)Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina... vrednost a D-neophodna za x. • Ako za svaki atribut a∈C vrednost a D-neophodna za x, onda se C može nazvati D-nezavisan (ortogonalan) za x. • Podskup C’⊆C je D-redukcija od x (redukcija vrednosti), akko je C’ D-nezavisan za x i [x]I(C) ⊆ [x]I(D) implicira [x]I(C’) ⊆ [x]I(D). Skup svih D-neophodnih ...
... neke vrednosti D određene vrednostima C. Formalno zavisnost se može definisati na sledeći način. Neka su D i C podskupovi od A. Možemo reći da D zavisi od C u stepenu k (0 ≤ k ≤ 1), C ⇒kD, ako je k =γ (C,D). Ako je k=1 možemo reći da D potpuno zavisi od C, a ako je k<1 možemo reći da D delimično ...
... konzistentnosti tabele odlučivanja i označava se sa γ(C,D), gde su C i D atributi uslova i odluke respektivno. Dakle ako je γ(C,D)=1 tabela odlučivanja je konzistentna, a ako je γ(C,D)≠1 tabela je nekonzistentna. Na primer, za tabelu 1 imamo γ(C,D)=4/6=0,667, što znači da je tabela 1 nekonzistentna ...Zoran M. Štirbanović. "Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-07-01)
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Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”
... variance-covariance matrix for standard deviations of coordinate differences was established: 22 , , 22 , 0 0 N N ET d N E N E E N N N E d d d K A K A E E N E d ν σ σσν σ σσ ν ν ν Δ Δ Δ Δ Δ Δ Δ Δ ∂Δ ∂Δ ∂Δ ∂Δ⎡ ⎤ ⎡ ⎤ ⎢ ⎥ ⎢ ⎥ ⎡ ⎤⎡ ⎤∂ ∂ ∂ ∂= ⋅ ⋅ = ⋅ ⋅ =⎢ ⎥ ⎢ ⎥ ⎢ ⎥⎢ ⎥∂Δ ∂Δ ∂Δ ∂Δ⎢ ⎥ ⎢ ⎥⎣ ...
... is located at the level +420m. This is the longest complex of the designed underground chambers, whose spatial length is d k =743.52m, and total horizontal length is d=739.73m. The total of 54 points is designed in those chambers; those points are to represent the future mine continuing series ...
... 2007): 1 1 1 1 1 tan i i i i i i i i i d H H H H i l z − − − − − = + Δ = + + − Whereby: H i - the level of the last point set out; H i-1 - the level of the previously set out point; ∆H i i-1 - the altitude difference be- tween points; d i i-1 - the horizontal length between points ...Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić. "Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”" in Revista Escola de Minas, School of Mines Magazine, Sao paulo, Brasil : SciELO (2015)
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Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta
Vesna Cvetkov (2020)... Prospecting Methods in Archaeology. London: Routledge. Conyers, L.B., Goodman, D. 1997. Ground-penetrating radar. An introdu- ction for archaeologists.Walnut, Creek, Altamira press. Cooper, G. R. J., Cowan, D. R. D. 2005. Differential reduction to the pole. Computer & Geosciences 31: 989- 999 ...
... doprinelo je da magnetometrija postane značajan alat u arheologiji. Smatra se da su istra- 16 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e živači Laboratorije za arheologiju i isto- ...
... ostale arheloške strukture veza- ne za iskopavanje i premeštanje gornjih slojeva tla. 18 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e Otklanjanje asimetrije magnetnih anomalija ...Vesna Cvetkov. "Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta" in Aktuelna interdisciplinarana istraživanja tehnologije u arheologiji jugoistočne Evrope: Zbornik radova, Prvi skup Sekcije za arheometriju, arheotehnologiju, geoarheologiju i eksperimentalnu arheologiju Srpskog arheološkog društva, Beograd, 28.02.2020. , Beograd : Srpsko arheološko društvo (2020)