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Приказ резултата 123-142 од 269

    • Influence of the Wavelength on the Bandwidth in W-Type Plastic Optical Fibers 

      Drljača, Branko; Simović, Ana; Djordjevich, Alexandar; Savović, Svetislav (Springer Link, 2021-07-03)
      We investigate the bandwidth and steady-state losses of multimode W-type plastic optical fibers solving the time-dependent power flow equation and show how the bandwidth in W-type plastic optical fibers can be enhanced ...

    • Influence of wavelength on equilibrium mode distribution and steady state distribution in W-type plastic optical fibers 

      Drljača, Branko; Simović, Ana; Djordjevich, Alexandar; Savović, Svetislav (IOP Science, 2020-05-27)
      Wavelength dependence of equilibrium mode distribution (EMD) and steady state distribution (SSD) in W-type plastic optical fibers (POFs) is investigated in this paper for parametrically varied width of the fiber’s ...

    • Influence of wavelength on the bandwidth of W-type plastic-clad silica optical fibers 

      Drljača, Branko; Simović, Ana; Djordjevich, Alexandar; Savović, Svetislav (IOP Science, 2020-01-07)
      The bandwidth and steady-state loss of multimode W-type plastic-clad silica optical fibers are investigated by solving the time-dependent power flow equation. The results show how the bandwidth of W-type plastic-clad ...

    • Influence of width of launch beam distribution and mode coupling on transmission characteristics of W-type plastic optical fibers 

      Drljača, Branko; Simović, Ana; Djordjevich, Alexandar; Min, Rui; Jovanović, Slavica; Savović, Svetislav (IOP Science, 2021-07-16)
      We show strong effects of width of the launch beam’s angular distribution on bandwidth and mode coupling in W-type plastic optical fibers (POFs). In general, the broader this width, the stronger the coupling and the lower ...

    • Influence of zero boresight and non-zero boresight pointing error on BER FSO transmission over Malaga atmospheric channel 

      Smilić, Marko; Perić, Zoran; Milić, Dejan; Marković, Aleksandar; Savić, Milan (Oficyna Wydawnicza Politechniki Wroclawskiej, 2018-03-22)
      In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free-space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for ...

    • Infrared wavelength dependence of leaky mode losses and steady state distribution in W-type glass optical fibers 

      Djordjevich, Alexandar; Simović, Ana; Savović, Svetislav; Drljača, Branko (Elsevier, 2018-03-13)
      Infrared wavelength dependence of leaky mode losses and steady state distribution (SSD) in W-type glass optical fibers (doubly clad fibers with three layers) is investigated in this paper for parametrically varied ...

    • Initial improvement of the hybrid accelerated gradient descent process 

      Panić, Stefan; Petrović, Milena; Mihajlov Carević, Miroslava (Cambridge University Press, 2018-08-01)
      We improve the convergence properties of the iterative scheme for solving unconstrained optimisation problems introduced in Petrovic et al. [‘Hybridization of accelerated gradient descent method’, Numer. Algorithms (2017), ...

    • Interaction between gold nanoparticles and selected antitumor gold complexes 

      Bondžić, Aleksandra; Vujačić Nikezić, Ana; Kalska, Beata; Klekota, Urszula; Laban, Bojana; Vodnik, Vesna; Vasić, Vesna (Society of Physical Chemists of Serbia, 2018-09-28)
      The paper presents the results of study of interaction between citrate capped gold nanoparticles (AuNPs) and some antitumor gold complexes with pyridine ligands (AubipyC, AubipyOH and AupyOAc), in order to elucidate the ...

    • Investigation of bandwidth in multimode graded-index plastic optical fibers 

      Simović, Ana; Drljača, Branko; Savović, Svetislav; Djordjevich, Alexandar; Min, Rui (Optica Publishing Group, 2021-09-13)
      A new method is proposed for investigating the bandwidth in multimode graded-index plastic optical fibers (GI POFs). By numerically solving the time-dependent power flow equation, bandwidth is reported for a varied launch ...

    • Iron Oxide Nanoparticles: Synthesis, Characterization and Application 

      Laban, Bojana; Milenković, Mila; Petković, Branka
      In this work, we present a review of the simple synthesis of iron(III)-oxide nanoparticles (Fe2O3 NPs), their characterization and potential application as nanosorbents and voltammetric sensors. Fe2O3 NPs were obtained ...

    • Irradiation resistance of elastomeric composites based on NR/CSM blend and waste rubber powder 

      Marković, Gordana; Marinović-Cincović, Milena; Jovanović, Vojislav; Samaržija-Jovanović, Suzana; Teofilović, Vesna; Marković, Marija; Pavličević, Jelena; Budinski-Simendić, Jaroslava (RAD Centre, Niš, Serbia, 2021-06-14)
      Effect of waste rubber particles (WTR) size on elastomers based on natural rubber and chlorosulfonated polyethylene rubber (NR/CSM= 50:50) was studied. Two types of WTR with different particle size (150–250 μm and 450–600μm) ...

    • Jačina ambijentalnog doznog eкvivalenta i кorelacija sa meteorološкim parametrima u gradu Valjevu i oкolini 

      Gulan, Ljiljana; Leković, Milovan; Spasić, Dušica; Vučković, Biljana
      Ради процене стања радиоактивности у животној средини, спроведена су мерења јачине амбијенталног дозног еквивалента у ваздуху на територији града Ваљева и околине. Истраживање је спроведено Гајгер-Милеровим бројачем ...

    • Knot Bending 

      Najdanović, Marija; Velimirović, Ljubica; Rančić, Svetozar
      In this paper we point out the geometric aspect of knots. By the term knot we mean a closed self-avoiding curve in a 3-dimensional Euclidean space. We consider infinitesimal bending of knots and examine the behavior of ...

    • Knot Energy 

      Velimirović, Ljubica; Najdanović, Marija; Rančić, Svetozar (Kyung Hee University , RIRCM, OCAMI & BK21PLUS, 2019-07-31)
      We discuss infinitesimal bending of curves and knots in R3. A brief overview of the results on the infinitesimal bending of curves is outlined. Change of the Willmore energy, as well as of the total curvature, total ...

    • KORELACIJA IZMEĐU NAČINA AKTIVIRANJA MONTMORILONITA K10 I SADRŽAJA FORMALDEHIDA U UREA-FORMALDEHIDNIM KOMPOZITIMA 

      Ristić, Mirjana; Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Petković, Branka; Kostić, Marija; Jovanović, Tijana; Marinović-Cincović, Milena (Faculty of Management Herceg Novi, 2022-05-26)
      U ovom radu je izvršeno poređenje načina aktiviranja montmorilonita (MMT) K10 sa sadržajem formaldehida (FA) u urea-formaldehidnim (UF) kompozitima. Uzorci MMT-a K10 su aktivirani na dva načina: termički i pomoću sumporne ...

    • KVALITATIVNA ANALIZA EFEKATA ELEKTRONSKOG UČENJA NA UNUTRAŠNJU MOTIVACIJU STUDENATA 

      Zlatković, Dragan; Denić, Nebojša; Petrović, Milena; Ilić, Miloš
      U nastavi studenata na visokoškolskim ustanovama i studijskim programima elektronsko učenje ima značajnu ulogu. Cilj ovog istraživanja koje je sprovedeno na Alfa BK Univerzitetu u Beogradu je istražiti odnos između ...

    • Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making 

      Kontrec, Nataša; Panić, Stefan; Panić, Biljana; Marković, Aleksandar; Stošović, Dejan (MDPI, 2021-05-20)
      Reliability, the number of spare parts and repair time have a great impact on system availability. In this paper, we observed a repairable system comprised of several components. The aim was to determine the repair rate ...

    • Mathematical Modeling of Integral Characteristics of Repair Process under Maintenance Contracts 

      Kontrec, Nataša; Vujaković, Jelena; Tošić, Marina; Panić, Stefan; Panić, Biljana (MDPI, 2021-12-08)
      The repair rate is a very important parameter for system maintainability and can be defined as a frequency of successfully performed repair actions on a failed component per unit of time. This paper analyzes the integral ...

    • MAXIMUM RELIABILITY K-CENTER LOCATION PROBLEM 

      Kontrec, Nataša; Panić, Biljana; Tošić, Marina; Vujošević, Mirko (Union of Mathematicians of Macedonia - ARMAGANKA, 2020-10-31)
      This paper presents an approach for solving the maximum reliability k-center location problem. We are modifying the well-known p-center problem in order to determine the location of the observed objects and maximize the ...

    • Method for investigation of mode coupling in multimode step-index silica photonic crystal fibers 

      Savović, Svetislav; Kovačević, Milan; Simović, Ana; Kuzmanović, Ljubica; Drljača, Branko; Djordjevich, Alexandar (Elsevier, 2021-07-30)
      We propose a new method for investigation the state of mode coupling in a multimode step-index silica photonic crystal fiber (SI SPCF) with a solid-core by solving the time-independent power flow equation. For various ...