Optics Communications
(Elsevier)
• 13 Mar 2018
Djordjevich, Alexandar • Simović, Ana • Savović, Svetislav • Drljača, Branko
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 depths and widths of the fiber’s
intermediate optical layer. This enables a tailoring of configuration of the W-type
fiber to suit an application at hand. We have shown that the proposed W-type fiber
has better transmission characteristics at longer infrared wavelengths.
Optics Communications
(Elsevier)
• 30 Jun 2018
Kovačević, Milan • Kuzmanović, Ljubica • Simović, Ana • Savović, Svetislav • Drljača, Branko • Djordjevich, Alexandar
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 size
and/or spacing of air holes in it. For various arrangements of air-holes, bandwidth is determined for such fiber
by the time-dependent power flow equation. Fiber bandwidth is thus not only a function of transmission length
but also of the spacing and size of air-holes a ...
Optical Fiber Technology
(Elsevier)
• 28 Aug 2018
Simović, Ana • Savović, Svetislav • Drljača, Branko • Djordjevich, Alexandar
Transmission characteristics (bandwidth and steady state loss) of multimode W-type glass optical fibers are investigated by solving the time-dependent power flow equation. Results show how the bandwidth in W-type glass optical fibers can be enhanced by shifting from the red to infrared wavelength region for different depths and widths of the intermediate layer as well as for different launch excitations. Such characterization of these fibers is consistent with their manifested effectiveness in r ...
Open Physics
(De Gruyter)
• 26 Jan 2022
Kevkić, Tijana S. • Nikolić, Vojkan R. • Stojanović, Vladica S. • Milosavljević, Dragana D. • Jovanović, Slavica J.
Modeling of the electrostatic potential for fully depleted (FD) silicon-on-insulator (SOI) metal-oxide-semiconductor field effect transistor (MOSFET) is presented in this article. The modeling is based on the analytical solution of two-dimensional Poisson’s equation obtained by using the homotopy perturbation method (HPM). The HPM with suitable boundary conditions results in the so-called HPM solution in general and closed-form, independent of the surface potential. The HPM solution has been app ...
Open Physics
(De Gruyter)
• 10 May 2022
Milosavljević, Dragana D. • Kevkić, Tijana S. • Jovanović, Slavica J.
Photovoltaic (PV) systems are an excellent solution to meet energy demand and protect the global environment in many cases. With the increasing utilization of the PV system worldwide, there is an increasing need for simulation tools to predict the PV system’s performance and profitability. This research includes testing and comparison of PV tools: photovoltaic geographical information system (PVGIS), PVWatts, SolarGIS, RETScreen, BlueSol, PVsyst, HelioScope, PV*SOL, Solarius PV, Solar Pro, PV F- ...
Advanced technologies
(Univerzitet u Nišu - Tehnološki fakultet, Leskovac)
• 10 Jul 2021
Kostić, Marija • Cakić, Suzana • Ristić, Ivan • Marinović-Cincović, Milena • Nikolić, Ljubiša • Samaržija-Jovanović, Suzana
Biodegradable polyurethanes can be the basis for drug delivery systems that
are sensitive to external changes. pH-sensitive polyurethanes (PUs) have been
used successfully as intravaginal rings and specific drug delivery systems for
the colon. In this study, a series of pH-sensitive polyurethane hydrogels with a
change of the polyol component (poly(ethylene glycol) 400/poly(propylene glycol)
2000/poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene
glycol) 1100), sacchari ...
Chemical Industry and Chemical Engineering Quarterly
(Association of Chemical Engeneers of Serbia)
• 24 Jan 2019
Jovanović, Slaviša • Jovanović, Vojislav • Marković, Gordana • Samaržija-Jovanović, Suzana • Milićević, Zoran • Marinović-Cincović, Milena • Budinski-Simendić, Jaroslava
The elastomeric materials based on NR/BR/SBR ternary rubber blend were investigated. The polyisoprene (NR), butadiene (BR) and styrene butadiene (SBR) rubbers were used as network precursors and carbon black (CB) as an active filler (60 phr) for elastomeric materials preparation. For sample preparation, the mass ratio of NR to BR was constant, 1:1, but the SBR content was varied from 0 to 80 phr. The morphological, mechanical and thermal properties of prepared elastomeric materials were determin ...
International Journal of Adhesion and Adhesives
(Elsevier)
• 15 Jun 2022
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Jovanović, Tijana • Kostić, Marija • Petković, Branka • Marković, Gordana • Porobić, Slavica • Papan, Jelena • Marinović-Cincović, Milena
Urea-formaldehyde (UF) composites with a formaldehyde/urea (FA/U) ratio = 0.8 and different particle sizes of montmorillonite (MMT), namely UF/KSF and UF/K10 were synthesized. The hydrolytic stability of modified UF composites was determined by measuring the content of the liberated formaldehyde of modified UF composites after acid hydrolysis. The synthesized modified UF composites were irradiated (50 kGy) and the effect of γ–irradiation was evaluated on the basis of these thermal behaviors. The ...
Polymer Bulletin
(Springer Nature)
• 25 Jan 2021
Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Petković, Branka • Jovanović, Slaviša • Marković, Gordana • Porobić, Slavica • Marinović-Cincović, Milena
The hydrolytic stability of two nano-SiO2-based UF composites with derivates of coumarin (names as K-1 and K-2) was investigated. K-1 is 3-nitro-4-(p-tolylamino)-2H-chromen-2-one and K-2: 4-((3-nitro-2-oxo-2H-chromen-4-yl)amino)benzenesulfonamide. Two types of nano-silica-based urea–formaldehyde (UF), composite materials with a formaldehyde-to-urea (F/U) ratio of 0.8, were synthesized (UF/K-1/SiO2, and UF/K-2/SiO2). The hydrolytic stability of modified UF composite was determined by measuring th ...
Polymer Composites
(Wiley)
• 16 Sep 2020
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Jovanović, Tijana • Marković, Gordana • Porobić, Slavica • Papan, Jelena • Marinović-Cincović, Milena
Urea-formaldehyde resin (F/U ratio of 0.8)/thermally activated montmorillonite (UF/ΔTK10) nanocomposite was synthesized. The hydrolytical, thermal, and UV radiation stability of UF/ΔTK10 nanocomposites are determined. UF hybrid nanocomposites have been irradiated with UV light with a wavelength of 254 nm and 366 nm, and after that, their radiation stability was evaluated. The free formaldehyde (FA) percentage in all prepared samples was determined. The sample was characterized by using X-ray dif ...
