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Упит dcterms_creator_txt:Aleksandar R. Radivojević

1303 items

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

    Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević (2021)
    Изингов модел, хексагонална решетка
    ... D (S,wnd) R (S) ≡ ∫ H eff c (R)+rβδh′ 0 H eff c (R)−rβδh′ 0 D (S) R,H (S)dH, (8) collected in the small windows of the external field for various disorders between R = 0.48 and R = 0.54. For each R the corresponding window is centered at the effective critical field H eff c (R), i.e., at the ...
    ... external field H and disorder R > Rc > 0 follow the scaling prediction [8,15,24,25] D (S) R,H (S) = S−τ D (S) + (Sσ r, h′r−βδ ). (6) Here, σ is the cutoff exponent describing the scaling Smax ∼ r−1/σ of the largest avalanche-size Smax with the reduced dis- order r = 1 − Rc/R, τ is the avalanche-size ...
    ... in Eq. (6) as X = Sσ r and Y = h′r−βδ . Integrating the distribution D (S) R,H (S) over all values of external field H , one gets the integrated avalanche-size distribution D (S,int) R (S) ≡ ∫ ∞ −∞ DS R,H (S)dH which scales as D (S,int) R (S) = S−(τ+σβδ) D̂ (S,int) + (Sσ r), (7) and has D̂ (S ...

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје
    ... corresponding value of external field is the critical field H (r) c (R, L) for the regular systems at disorder R < Reff c (L). However, if a spanning interface is preset, then at a certain value H (i) c (R, L) of external field, lower than H (r) c (R, L) and playing the role of critical field, a spanning ...
    ... (i) c (R, L) for Rc < R < Reff c (L) and has no this effect at lower disorders. This, together with all foregoing findings, suggests the following recipe for singling out the Rc and Reff c (L) values: Reff c (L) is disorder above which H (i) c (R, L) = H (r) c (R, L); below it H (i) c (R, L) < H ...
    ... and external field should be such that one of 2L2 spins flips first, leading to Hc(R, L) = 4 − R √ 2erf−1 ( 1 − 1 L2 ) . (4) Analogous equations Hc(R, L) = 4 − R √ 2erf−1 ( 1 − 2 L2 ) , (5) Hc(R, L) = 2 − R √ 2erf−1 ( 1 − 1 L ) , (6) we derived for the regular 2D-quadratic system and ...

  • Investigation of Co0.9Ho0.1MoO4 Nanopowders Obtained by Glycine Nitrate Procedure

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... University in Skopje, R. N. Macedonia Members: Assoc. Prof. Dr. Vojo Jovanov, Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University in Skopje, R. N. Macedonia Iva Dimitrievska, MSc, Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University in Skopje, R. N. Macedonia ...
    ... and Metallurgy, Ss. Cyril and Methodius University in Skopje, R. N. Macedonia Members: Prof. Dr. Trajče Stafilov, Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University in Skopje, R. N. Macedonia Prof. Dr. Viktor Stefov, Institute of Chemistry ...
    ... Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University in Skopje, R. N. Macedonia Prof. Dr. Blazo Boev, Faculty of Natural and Technical Sciences, Goce Delčev University, Štip, R. N. Macedonia Prof. Dr. Panče Naumov, Division of Science and Mathematics, New York University ...

  • Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević (2019)
    Изингов модел, критично понашање, танки системи
    ... value H j (R) of the external field at which the system experiences a first-order phase transition manifested in a jump of magnetization �M(R) that is caused by infinite avalanche(s). Both H j (R) and �M(R) depend on disorder R, and, when R tends to Rc from below, the transition field H j (R) tends ...
    ... approximations have been proposed so far. Thus, r= (R—R.)/R, ’ =H — H, + br, and 1/L was pro- posed by Sethna etal. (see Ref. [3] and the references therein), whereas Perez-Reche and Vives [63] proposed u = u; + Au; and v =v; + B’u, instead of r and h’, where uj = (R— R.)/Re and v; = (H — H.)/H,. Although seemingly ...
    ... appropriate exponents. In the case of infinite RFIM systems and x1 = r, x2 = h′ this implies that the reduced magnetization m = −∂g/∂h′ satisfies m(r, h′) = a−1+α2 m(aα1 r, aα2 h′), or equivalently m(r, h′) = |r|(1−α2 )/α1M±(h′|r|−α2/α1 ), 032113-11 CRITICAL DISORDER AND CRITICAL MAGNETIC FIELD ...

  • Hydrogeothermal potentials of Rogozna mountain and possibility of their valorization

    D. R. Ivanović, Dj. A Valjarević, R. D. Srećković-Batoćanin, N. M. Martić-Bursać, D. Ž. Vukoičić, R. M. Ivanović (2020)
    Geotermalna energija, hidrogeotermalni potencijal, stepen iskorišćenja, banja, Rogozna, Srbija

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method

  • Contribution to the geotechnical classification of municipal waste landfills in Serbia

    Dragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić (2018)
    Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental Engineering
    ... 37·86 100·0 100 Ada Huja 90 80 70 60 50 40 30 20 10 0 IC 26·6% R 73·4% 1 10 100 Grain size d: mm P e r ce n t fi n e r b y w e ig h t: % R u b b e r – 6 ·1 % T e xt ile – 1 2 ·6 % P a p e r – 1 9 ·8 % P la st ic – 6 1 ·5 % Cumulative Plastic Paper Textile ...
    ... UnclassifiedP e r ce n t fi n e r b y w e ig h t: % R u b b e r – 1 ·6 % W o o d – 2 ·9 % T e xt ile – 3 ·4 % P a p e r – 5 ·3 % M e ta l – 5 ·7 % C e ra m ic s – 8 ·9 % G la ss – 1 4 ·3 % U n cl as si fi ed – 5 7 ·9 % R 49·5% IC 50·5% ...
    ... Sad 100 90 80 70 60 50 40 30 20 10 0 1 10 100 Grain size d: mm R u b b e r – 6 ·4 % T e xt ile – 9 ·1 % P a p e r – 2 1 ·0 % P la st ic – 6 3 ·5 % R 85·4% IC 14·6% P e r ce n t fi n e r b y w e ig h t: % Cumulative Plastic Paper Textile Rubber Figure ...

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... Assessment in Oil and Gas Industry Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Integrative GHG Assessment in Oil and Gas Industry | Aleksandar Mirković, Marija Živković, Stevan ...
    ... UDK 628.539:504.3.054 Integrative GHG Assessment in Oil and Gas Industry Određivanje emisije gasova staklene bašte u industriji nafte i gasa Aleksandar Mirković*, Marija Živkovic'", Stevan Denadić“, Darja Lubarda*, Chinedu Anyanwa* *MudoZangl Nigeria Itd. ""University of Belgrade, Faculty of ...
    ... and gas production, Energy Conversion and Management: X, Vol. 17, 100347, 2023. https://doi.org/10.1016/j.ccmx.2023.100347 AUTORI/AUTHORS Aleksandar Mirković - MSc, petroleum cngincering, MudoZangl Nigeria Itd., aleksandar.mirkovic(0)mudozangl.com, ORCID 0009-0008- 1000-1441 Marija Živković ...

  • Korelacija magnetnog susceptibiliteta i sadržaja metala u flotacijskom jalovištu

    Filip Abramović, Vesna Cvetkov, Aco Ilić, Dragana Životić (2022)
    Procena metala u rudama, jalovištu i zemljištu se tradicionalno određuje hemijskim metodama kao što su Rengen fluorescentna analiza (XRF), Instrumentalna neutronska aktivaciona analiza (INAA) i Masena spektrometrija induktivno spregnute plazme (ICP-MS). Neke od pomenutih metoda su veoma zahtevne i skupe, te se nametnula potreba ka traženju jeftinijeg alata za brzu procenu prisustva pojedinih metala. Tokom poslednjih nekoliko decenija, mnoge studije su pokazale da su magnetna merenja dovoljno osetljiva da detektuju magnetni signal feromagnetnih materijala, a samim tim i metala ...
    flotacijsko jalovište, makroelementi, magnetna merenja

  • Debris-flow Susceptibility Assessment in Flow-R: Ribnica River Case Study

    Ksenija Micić, Miloš Marjanović, Biljana Abolmasov (2024)
    Debris flows are among the most dangerous erosional geohazards due to the fast rate of movement and long runout zones. Even though the initiation can be triggered in mountainous areas, inhabited and with steep slopes, their propagation and deposition can endanger not only buildings and infrastructure in the urbanized areas, but also threaten human lives. As these initiation areas usually represent unattainable terrains with rapid vegetation cover development, field observations and aerial photo analysis become high-demanding tasks. Consequently, medium-to-regional ...
    tečenje drobine, Flow-R, procena podložnosti, empirijski model

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost

  • Effects of external noise on threshold-induced correlations in ferromagnetic systems

    Dragutin Jovković, Sanja Janićević, Svetislav Mijatović, Lasse Laurson, Đorđe Spasojević (2021)
    Изингов модел, праг детекције, екстерни шум
    ... ns obtained for four systems such that their dimensions L, disorders R, and threshold levels Vth satisfy conditions Eq. (6): L = 1448, R = 2.27,Vth = 75, L = 2046, R = 2.25,Vth = 102, L = 2508, R = 2.24,Vth = 126, and L = 3072, R = 2.231,Vth = 153. On the main panels are shown the collapses of the ...
    ... threshold axis by the amount p(σ ), it overlaps with the distribution n(Tw; R,Vth, σ = 0, L): n(Tw; R,V ′ th − p(σ ), σ, L) = n(Tw; R,Vth, σ = 0, L). (2) For the fixed R > Rc, where Rc = 2.16 is the critical disor- der in the three-dimensionalnonequilibrium RFIM [49], the shift parameter is independent ...
    ... the noise standard deviation), while r = (R − Rc)/R represents reduced disorder of the system. The exponent αint is used because the data was gathered from the finite windows of the external magnetic field [55,68]. This means that the distribu- tions DTw (Tw;Vth, r, 1/L) of the waiting time, Tw multiplied ...

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics
    ... taking into account the driving rate, we have modified the scaling (B.3) and (B.4) to the forms mR,L(H) = |r|βM̃±(h ′/|r|βδ, 1/L|r|ν, Ω|r|ν), (B.5) χR,L(H) = |r|β−βδX̃±(h ′/|r|βδ, 1/L|r|ν, Ω|r|ν). (B.6) Given that the systems parameters satisfy the conditions Lrν = const. and Ωrν = const., the scaling ...
    ... distributions For finite systems in the adiabatic regime, the finite-size scaling of M and χ is of the form mR,L(H) = |r|βM̃±(h ′/|r|βδ, 1/L|r|ν), (B.3) χR,L(H) = |r|β−βδX̃±(h ′/|r|βδ, 1/L|r|ν). (B.4) In order to test the validity of the aforementioned scaling for the finite driving case, we have performed ...
    ... mR(H) = |r|βM±(h ′/|r|βδ), (B.1) and χR(H) = |r|β−βδX±(h ′/|r|βδ). (B.2) https://doi.org/10.1088/1742-5468/ac1f12 18 J . S ta t. M e c h . (2 0 2 1 ) 0 9 3 3 0 1 The effect of finite driving rate on avalanche distributions Figure B1. (a) Single-run magnetizations for system with L = 512, R = 2.12–2 ...

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...

  • Reprint of Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: implication on grindability index

    Životić Dragana, Bechtel A., Sachsenhofer R., Gratzer R., Radić D., Obradović M., Stojanović Ksenija (2015)

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе

  • On the distribution modulo 1 of the sum of powers of a Salem number

    Dragan Stankov (2016)
    It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials
    ... can use [2], Theorem 4.6.3. Consequently, for all L, R such thatOR<1/2, 572 D. Stankov / C. R. Acad. Sci. Paris, Ser. I 354 (2016) 569–576 lim N→∞ 1 N card{n < N|L ≤ ‖nω‖ ≤ R} = 2(R − L), lim N→∞ 1 N card{n < N|L ≤ ‖nω + 1 2 ‖ ≤ R} = 2(R − L). Let K1 ≤ K be natural number such that Q −1 ...
    ... function, resulting from the previous corollary: 572 D. Stankov / C. R. Acad. Sci. Paris, Ser. | 354 (2016) 569-576 1 lim yeardin < NL < ||n@|| < R} =2(R—-L), N>oo 1 1 lim —card{n < N|L <||n =||<R}=2(R-L). Jim, jcard{n < NiL <|Ino+ >| <R}=2(R—L) Let K; < K be natural number such that Qy', Qs',..., Qk, are ...
    ... zero in R/Z when θ is a Pisot number. If θ is a Salem number then (θn)n≥1 is dense in R/Z, i.e. the fractional parts of θn are dense in the unit interval [0, 1], but are not uniformly distributed. (See [2], pp. 87–89.) Moreover, Salem numbers are the only known numbers whose powers are dense in R/Z. A ...

  • Допринос одређивању безопасног растојања при извођењу минирања

    Slobodan Trajković, Sanja Bajić, Ivan Krsmanović (2023)
    минирање, експлозија, потреси од минирања
    ... rzacuH [2,3]: v=-K,R .1 ede cy: – Op3uHa ocnuJIoOBabba uecTHIIa TJIA V MHHMHpabeM no0yleHe cpejiHe, cm/s – KOCOD. H ČKCHOHCHT KOJH 3A4BHCC OJL IŽ“ yCHOBa MHHHpaMba H KapaKkTepHcTHKa pajiHe cpejuHe, - pejNlyKOBaHO pacToOjaĐe, KOje CC R MOXE H3pa3HTH OJIHOCOM R=r/{Qa p pacrojape OJ MeCTa ...
    ... O0e30ebDeHa je y3 ycJloB: r>15,797 3/Qa, „(m) (3.6.) rnmeje: r—-— (OesonacHo pacrojabe,(m) 178 Quk — yKyHHO yHnoTpcOJbeHa KOJIHUHHA eKcIIo3HBa, (kg). rpH MeMy TpeOa BOJIHTH pauyHa, Ipe CBaKOTr | MMHHHpaPa, a pe)nyKoBaHo pacrojaec (R) Oyne Behc HHH jemHako R > 15,797 rama he oueKHBaHa Op3HHa ...
    ... MOTy OJIpa3HTH Ha OKOJIHe O0jekTe. r= 15.797 Q B e z b e d n o ra st oj an je , r (m ) O 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 Kolicina eksploziva, Q (kg) Cimka 3.2. KpaBa Oe3onacHor pacrTojahba (r) y 33BHCHOCTH OJI KOJIHUHHC CKCIIJIO3HBa ...