Prikazano Природно-математички факултет za datum izdavanja

Prikaz rezultata 1-20 od 269

    • GIS analysis of land cover changes on the territory of the Prokuplje municipality 

      Valjarević, Aleksandar; Živković, Dragica; Valjarević, Dragana; Stevanović, Vladica; Golijanin, Jelena (Hindawi, 2014-01-03)
      The monitoring of the territory of Prokuplje Municipality was done based on 1 : 25,000 topographic maps in three different time periods (1969, 1974, and 1984) and land cover map in 2012. Analogous topographic maps done in ...

    • Nanospectroscopy of thiacyanine dye molecules adsorbed on silvernanoparticle clusters 

      Ralević, Uroš; Isić, Goran; Vasić-Anićijević, Dragana; Laban, Bojana; Bogdanović, Una; Lazović, Vladimir; Vodnik, Vesna; Gajić, Radoš (Elsevier, 2017-10-25)
      The adsorption of thiacyanine dye molecules on citrate-stabilized silver nanoparticle clusters drop-cast onto freshly cleaved mica or highly oriented pyrolytic graphite surfaces is examined using colocalized surface-enhanced ...

    • Ternary NR/BR/SBR rubber blend nanocomposites 

      Jovanović, Slaviša; Samaržija-Jovanović, Suzana; Marković, Gordana; Jovanović, Vojislav; Adamović, Tijana; Marinović-Cincović, Milena (SAGE, 2018-02-24)
      The goal of this work was to synthesize and characterize ternary rubber blends based on polyisoprene (natural rubber (NR)), polybutadiene rubber (BR), and styrene–butadiene rubber (SBR) (NR/BR/SBR = 25/25/50) reinforced ...

    • STRUKTURIRANJE EKOLOSKI PRIHVATLJIVIH ELASTOMERNIH KOMPOZITNIH MATERIJALA 

      Kojić, Dejan; Vukić, Nevena; Samaržija-Jovanović, Suzana; Erceg, Tamara; Jovičić, Mirjana; Aleksić, Vojislav; Ristić, Ivan; Mićić, Vladan (Univerzitet u Kragujevcu, Agronomski fakultet u Čačku, 2018-03-09)
      Kod recikliranja otpadne gume neophodno je poznavati hemijski sastav otpadnog proizvoda, ukoliko će se on koristiti u recepturama za nove hibridne elastomerne materijale. Kompozitni elastomerni materijali dobijeni od ...

    • 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 ...

    • Environmental risk assessment of radioactivity and heavy metals in soil of Toplica region, South Serbia 

      Stevanović, Vladica; Gulan, Ljiljana; Milenković, Biljana; Valjarević, Aleksandar; Zeremski, Tijana; Penjišević, Ivana (Springer, 2018-03-13)
      Activity levels of natural and artificial radionuclides and content of ten heavy metals (As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn and Hg) were investigated in 41 soil samples collected from Toplica region located in the south ...

    • 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 ...

    • Influence of mode coupling on three, four and five spatially multiplexed channels in multimode step-index plastic optical fibers 

      Savović, Svetislav; Djordjevich, Alexandar; Simović, Ana; Drljača, Branko (Elsevier, 2018-04-04)
      We investigate the influence of mode coupling on space division multiplexing capability of three multimode step-index plastic optical fibers with different strengths of mode coupling. Results show that mode coupling ...

    • Neodrživost prakse urbanističkog planiranja u Srbiji – primer izmena i dopuna planova generalne regulacije. 

      Ristić, Dušan; Ivanović, Marko; Marjanović, Marjan; Milošević, Dušan; Miličević, Mario (Asocijacija prostornih planera Srbije, Univerzitet u Beogradu – Geografski fakultet, 2018-04-10)
      Srbija nakon 2000. godine, urbzano prolazi kroz proces post-socijalističke transformacije. Ovaj proces prati transformacija socijalističke privrede, odlikovane snažnom regulatornom ulogom države, ka kapitalističkoj privredi, ...

    • DOPRINOS FIGURATIVNIH BROJEVA RAZVOJU VIZUELNO LOGIČKOG PRISTUPA REŠAVANJU ZADATAKA SA BROJNIM NIZOVIMA 

      Mihajlov Carević, Miroslava; Petrović, Milena; Denić, Nebojša (Univerzitetska misao - časopis za nauku, kulturu i umjetnost, Novi Pazar, 2018-05-01)
      Savremena nastava matematike na svim nivoima obrazovanja uglavnom se svodi na primenu algebarskih formula i algebarskih postupaka. Vizuelno-logički pristup sagledavanju i rešavanju matematičkih zadataka vrlo malo je prisutan ...

    • Environmental radioactivity with respect to geology of some Serbian spas 

      Gulan, Ljiljana; Valjarević, Aleksandar; Milenković, Biljana; Stevanović, Vladica; Milić, Gordana; Stajić, Jelena M. (Springer, 2018-05-17)
      This study was performed in order to investigate gamma dose rates, radon exhalation rates and soil radioactivity with respect to geology. Fifteen locations in three Serbian spas were under investigation. Gamma dose rate ...

    • Uticaj razlicitih doza y-zračenja na hidrolitičku stabilnost modifikovanih urea-formaldehidnih (UF) smola 

      Jovanović, Vojislav; Samaržija-Jovanović, Suzana; Jevtić, Sonja; Petković, Branka; Marković, Gordana; Marinović-Cincović, Milena (Srpsko hemijsko drustvo, 2018-05-30)
      Zbog emisije formaldehida (CH2O) iz drvenih proizvoda, gde se urea- formaldehidne (UF) smole, izmedu ostalog, koriste za impregnaciju drvenih panela koje se koriste u unutrašnjosti stambenih i drugih objekata pozeljno ...

    • C-class functions on some fixed point results in ordered partial metric spaces via admissible mappings 

      Ansari, Arslan Hojat; Došenović, Tatjana; Radenović, Stojan; Saleem, Naeem; Šešum-Čavić, Vesna; Vujaković, Jelena (Department of Mathematics and Informatics, Faculty of Sciences, Novi Sad, 2018-06-05)
      In this paper, we generalized the results presented in the paper W. Long, S. Khaleghizadeh, P. Salimi, S. Radenović and S. Shukla, Some new fixed point results in partially ordered metric spaces via admissible mappings, ...

    • Statistical causality and local uniqueness for solutions of the martingale problem 

      Petrović, Ljiljana; Valjarević, Dragana (2018-06-15)
      In this paper we consider the concept of statistical causality between filtrations associated with stopping times, which is based on Granger’s definition of causality. Especially, we consider a generalization of a causality ...

    • Determination of glass transition temperature and irradiation resistance of elastomeric materials based on chlorinated natural rubber 

      Budinski-Simendić, Jaroslava; Marinović-Cincović, Milena; Kojić, Dejan; Marković, Gordana; Pavličević, Jelena; Aroguz, Ayse; Samaržija-Jovanović, Suzana (RAD Association, 2018-06-18)
      Synthetic rubbers have different surface structures but benefit from chlorination. In many cases their tensile strength and extensibility is lower than natural rubber and for that reason more easily mechanically damaged. ...

    • SSC Reception over Kappa-Mu Shadowed Fading Channels in the Presence of Multiple Rayleigh Interferers 

      Stevanović, Aco; Panić, Stefan; Spalević, Petar; Prlinčević, Bojan; Savić, Milan (Kaunas University of Technology, 2018-06-22)
      Modelling of complex wireless transmission scenario over fading channels in the presence of multiple co- channel (CCI) interferers will be presented in this paper. Propagation environment will be modelled with general ...

    • Calculation of the bandwidth of W-type photonic crystal fibers by time-dependent power flow equation 

      Kovačević, Milan; Kuzmanović, Ljubica; Simović, Ana; Savović, Svetislav; Drljača, Branko; Djordjevich, Alexandar (Elsevier, 2018-06-30)
      A multimode photonic crystal fiber with a solid-core takes the characteristic W-shaped index profile upon forming an inner cladding layer with its own value of the effective refractive index corresponding to the distinct ...

    • Statistical causality, martingale problems and local uniqueness 

      Petrović, Ljiljana; Valjarević, Dragana (Taylor and Francis, 2018-07-21)
      The paper considers a statistical concept of causality in continuous time in the filtered probability spaces which is based on the Granger’s definition of causality. The given causality concept is then applied to the ...

    • 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), ...

    • The assessment of aridity in Leskovac Basin, Serbia (1981-2010) 

      Милентијевић, Никола; Драгојловић, Јован; Ристић, Душан; Цимбаљевић, Марија; Демировић, Дуња; Ваљаревић, Александар (2018-08-25)
      In the paper, the aridity is defined on the basis of four climate indices: De Martonne's index of aridity, Lang’s Rain Factor and Gračanin’s Rain factor for the vegetation period and hydrothermal coefficient of Seljaninov. ...