Land Use Policy
(Elsevier Ltd.)
• 21 Sep 2019
Ristić, Dušan • Vukoičić, Danijela • Milinčić, Miroljub
With the formulation of tourism development strategies for the social and economic development of an area, rural tourism moved to a more complex phase of development. Numerous empirical studies have shown that different forms of rural tourism can have positive and negative effects on the natural and socio-economic context in the area where they are present. There are several methodologies for assessing the development of tourism in rural areas. One of the efficient and commonly used tools in pre ...
Optics Express
(Optica Publishing Group (Formerly OSA))
• 23 Jun 2022
Drljača, Branko • Savović, Svetislav • Kovačević, Milan • Simović, Ana • Kuzmanović, Ljubica • Djordjevich, Alexandar • Min, Rui
By solving the time-independent power flow equation (TI PFE), we study mode coupling in a multimode W-type microstructured polymer optical fiber (mPOF) with a solid-core. The multimode W-type mPOF is created by modifying the cladding layer and reducing the core of a multimode singly clad (SC) mPOF. For such optical fiber, the angular power distributions, the length Lc at which an equilibrium mode distribution (EMD) is achieved, and the length zs for establishing a steady state distribution (SSD) ...
Frontiers in Physics
(Frontiers)
• 25 May 2022
Savović, Svetislav • Djordjevich, Alexandar • Drljača, Branko • Simović, Ana • Min, Rui
Using the power flow equation (PFE), this article investigates mode coupling in step-index
(SI) multimode (MM) polymer optical fiber (POF). This equation’s coupling coefficient was
initially fine-tuned so that it could appropriately reconstruct previously recorded far-field
(FF) power distributions. The equilibrium mode distribution (EMD) and steady-state
distribution (SSD) in the SI MM POF were found to be obtained at lengths Lc = 15 m
and zs = 41 m, respectively. These lengths are substan ...
Polymers
(MDPI)
• 01 Dec 2021
Drljača, Branko • Savović, Svetislav • Kovačević, Milan • Simović, Ana • Kuzmanović, Ljubica • Djordjevich, Alexandar • Min, Rui
By solving the time-dependent power flow equation, we present a novel approach for evaluating the bandwidth in a multimode step-index polymer photonic crystal fiber (SI PPCF) with a solid core. The bandwidth of such fiber is determined for various layouts of air holes and widths of Gaussian launch beam distribution. We found that the lower the NA of SI PPCF, the larger the bandwidth. The smaller launch beam leads to a higher bandwidth for short fibers. The influence of the width of the launch be ...
Polymers
(MDPI)
• 17 Nov 2021
Simović, Ana • Savović, Svetislav • Drljača, Branko • Alexandar, Djordjevich • Min, Rui
The bandwidth of multimode W-type plastic optical fibers (POFs) with graded-index (GI) core distribution is investigated by solving the time-dependent power flow equation. The multimode W-type GI POF is designed from a multimode single-clad (SC) GI POF fiber upon modification of the cladding layer of the latter. Results show how the bandwidth in W-type GI POFs can be enhanced by increasing the wavelength for different widths of the intermediate layer and refractive indices of the outer cladding. ...
Optics Express
(Optica Publishing Group)
• 13 Sep 2021
Simović, Ana • Drljača, Branko • Savović, Svetislav • Djordjevich, Alexandar • Min, Rui
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 conditions (radial offsets) of multimode GI POF. Our
theoretical results are supported by the experimental results which show that bandwidth decreases
with increasing radial offset. This decrease is more pronounced at short fiber lengths. At fiber
length close to the coupl ...
Optics and Laser Technology
(Elsevier)
• 11 Jun 2021
Simović, Ana • Djordjevich, Alexandar • Drljača, Branko • Savović, Svetislav
A method is proposed for investigation of transmission along a multimode W-type (doubly clad) plastic optical fiber (POF) with graded index (GI) distribution of the core. The multimode W-type GI POF is designed from a multimode singly clad (SC) GI POF fiber upon modification of the cladding layer of the latter. The transmission characteristics of such proposed W-type GI POF are determined from the numerical solution of the power flow equation. We have shown that coupling length Lc at which an eq ...
Applied Surface Science
(Elsevier)
• 25 Oct 2017
Ralević, Uroš • Isić, Goran • Vasić-Anićijević, Dragana • Laban, Bojana • Bogdanović, Una • Lazović, Vladimir • Vodnik, Vesna • Gajić, Radoš
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 Raman spectroscopy and atomic force microscopy. The incidence of dye Raman sig-natures in photoluminescence hotspots identified around nanoparticle clusters is considered for both citrate- and borate- capped silver nanoparticles and found to be substantially lower in the for ...
Journal of Inorganic Biochemistry
(Elsevier)
• 11 Dec 2019
Laban, Bojana • Ralević, Uroš • Petrović, Suzana • Leskovac, Andreja • Vasić-Anićijević, Dragana • Marković, Mirjana • Vasić, Vesna
The simple green method for synthesis of stable L-Methionine (L-Met) capped silver (Ag@LM NPs) and gold (Au@LM NPs) nanoparticles (NPs) without adding any additional reduction agent or stabilizer was developed. Colloidal dispersions were characterized by UV–Vis spectrophotometry. The size and spherical shape of NPs were evaluated by transmission electron microscopy. Their surface covering was confirmed by atomic force
microscopy, Fourier transform infrared spectroscopy, dynamic light scattering ...
International Journal of Molecular Sciences
(MDPI)
• 11 Aug 2022
Bondžić, Aleksandra • Jovanović, Dunja • Arsenijević, Nevena • Laban, Bojana • Lazarević-Pašti, Tamara • Klekota, Urszula • Bondžić, Bojan
The study of the interactions between nanoparticles (NPs) and proteins has had a pivotal
role in facilitating the understanding of biological effects and safe application of NPs after exposure to the physiological environment. Herein, for the first time, the interaction between L-methionine capped silver nanoparticles (AgMet), and bovine serum albumin (BSA) is investigated in order to predict the fate of AgMet after its contact with the most abundant blood transport protein. The detailed insigh ...
Mediterranean Journal of Mathematics
• 01 Apr 2024
Maksimović, Miroslav • Zlatanović, Milan
By using decomposition of curvature tensors of generalized Riemannian space in the Eisenhart sense, the Einstein type curvature tensors and Einstein type tensors of that space are determined and defined. All these tensors vanish if the corresponding Ricci tensors also
vanish in the observed space. All these tensors are traceless tensors and their properties of symmetry and anti-symmetry were examined. We proved that the Einstein type curvature tensors of the second kind, of the fourth kind and o ...
Journal of Lightwave Technology
(IEEE)
• 03 Jul 2019
Savović, Svetislav • Simović, Ana • Drljača, Branko • Djordjevich, Alexandar • Stepniak, Grzegorz • Bunge, Christian Alexander • Bajić, Jovan
A method is proposed for predicting the evolution of the power distribution along graded-index plastic optical fibers. This method is verified against our recently reported measurements. The strong influence of mode coupling on the power distribution is demonstrated on a specific graded-index plastic fiber to illustrate the influence of mode coupling in applications, such as
data transmission, power delivery, and sensing systems.
Optics and Laser Technology
(Elsevier)
• 02 Nov 2018
Simović, Ana • Savović, Svetislav • Drljača, Branko • Djordjevich, Alexandar
We propose a multimode W type (doubly clad) plastic optical fiber which takes the characteristic W-shaped index profile designed from a multimode singly clad step index plastic optical fiber upon modification of the cladding layer of the latter. For different widths of the inner cladding and refractive index of the outer cladding, the bandwidth and steady-state loss are determined for such W type plastic optical fiber. We have shown that bandwidth of W type plastic optical fiber is significantly ...
Optics and Laser Technology
(Elsevier)
• 04 Apr 2018
Savović, Svetislav • Djordjevich, Alexandar • Simović, Ana • Drljača, Branko
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 significantly limits the fiber length at which the space division multiplexing can be realized with
a minimal crosstalk between the neighbor optical channels. Three, four and five spatially multiplexed
channels in the investigated multimode step-index plastic optical fibers can be ...
Surfaces and Interfaces
• 01 Apr 2024
Stanković, Dalibor • Ognjanović, Miloš • Fabián, Martin • Viktorovich Avdin, Vyacheslav • Manojlović, Dragan • Vranješ Đurić, Sanja • Petković, Branka
The goal of this work was to develop green electrode material that unites all advantages of domestic made, synthesized porous carbon powder and ceria dioxide nanoparticles known due to exceptional catalytic properties. Thermal decomposition of Novolac phenol-formaldehyde resin and cerium sulfate resulting in producing a high-performance CeO2 porous carbon material highly sensitive to dopamine (DA) electrooxidation. Morphological
and structural characteristics of the material were determined by ...
Dalton Trans.
• 01 Apr 2024
Savić, Nada • Petković, Branka • Vojnović, Sandra • Mojicevic, Marija • Wadepohl, Hubert • Olaifa, Kayode • Marsili, Enrico • Nikodinović-Runić, Jasmina • Djuran, Miloš • Glišić, Biljana
New dinuclear silver(I) complexes with N,N’,N’’,N’’’-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc), [Ag2(NO3)(tpmc)]NO3·1.7H2O (1), [Ag2(CF3SO3)2(tpmc)] (2), and [Ag2(tpmc)](BF4)2 (3) were synthesized and characterized by NMR (1H and 13C), IR and UV-Vis spectroscopy, cyclic voltammetry and molar conductivity measurements. The molecular structures of the complexes were determined by single-crystal X-ray diffraction analysis. The spectroscopic and crystallographic data showed ...
Microchemical Journal
• 01 Apr 2024
Knežević, Sara • Ognjanović, Miloš • Nedić, Nemanja • Mariano, José • Milanović, Zorana • Petković, Branka • Antić, Bratislav • Vranješ Djurić, Sanja • Stanković, Dalibor
In order to ensure high food quality, one of the prime importance is the detection and quantification of histamine, well known marine food poison. In this work, we constructed novel electrochemical biosensor for the detection of histamine based on gold nanoparticles decorated on manganese dioxide (Au/MnO2) and used for modification of screen-printed carbon electrode (Au/MnO2@SPCE). The constructed sensor was then used for the estimation of histamine content in a single drop. Materials used in th ...
Electrochimica Acta
• 01 Apr 2024
Jevtić, Sonja • Vukojević, Vesna • Đurđić, Slađana • Pergal, Marija • Manojlović, Dragan • Petković, Branka • Stanković, Dalibor
This work present a new approach for the detection of relatively new herbicide pethoxamid (POA), a first electrochemical behavior and determination based on its oxidation on boron-doped diamond electrode in Britton-Robinson buffer solution at pH 4. Square wave voltammetric technique was used for quantification of POA at anodic potential of 1.35 V vs reference Ag/AgCl electrode. The proposed electroanalytical method is operational in the linear working range from 3 to 100 μM of POA with a limit o ...
Environmental Science and Pollution Research
• 01 Apr 2024
Pergal, Marija • Kodranov, Igor • Dojčinović, Biljana • Avdin, Viacheslav • Stanković, Dalibor • Petković, Branka • Manojlović, Dragan
Chlorine dioxide (ClO2) degradation of the organophosphorus pesticides azamethiphos (AZA) and dimethoate (DM) (10 mg/L) in deionized water and in Sava River water was investigated for the first time. Pesticide degradation was studied in terms of ClO2 level (5 and 10 mg/L), degradation duration (0.5, 1, 2, 3, 6, and 24 h), pH (3.00, 7.00, and 9.00), and
under light/dark conditions in deionized water. Degradation was monitored using high-performance liquid chromatography. Gas chromatography coupl ...
Applicable Analysis and Discrete Mathematics
(University of Belgrade - School of Electrical Engineering)
• 26 Oct 2021
Najdanović, Marija • Velimirović, Ljubica • Rančić, Svetozar
In this paper we consider infinitesimal bending of the second order of curves
and knots. The total torsion of the knot during the second order infinitesimal
bending is discussed and expressions for the first and the second variation of
the total torsion are given. Some examples aimed to illustrate infinitesimal
bending of knots are shown using figures. Colors are used to illustrate torsion
values at different points of bent knots and the total torsion is numerically
calculated.
Mediterranean Journal of Mathematics
(Birkhaeuser Verlag AG)
• 11 May 2022
Najdanović, Marija • Velimirović, Ljubica • Vesić, Nenad
Infinitesimal deformations of subspaces of a generalized Riemannian
space are studied in this paper. Variations of some geometric
objects are found. Necessary and sufficient conditions which provide the
existence of a geodesic infinitesimal deformation of a generalized Riemannian
space are obtained. Basic equations of a geodesic infinitesimal
deformation such as a system of differential equations which determined
an infinitesimal deformation field are given.
Air Quality, Atmosphere & Health
(Springer)
• 01 Apr 2024
Gulan, Ljiljana • Stajic, Jelena M. • Spasić, Dušica • Forkapić, Sofija
This study was conducted toevaluate the influence of thermal retrofit on radon levels in workrooms,and to determine whetherthe radon concentrationin the building changes after the application of retrofit measures.In thefirst survey, digital radon detector Airthings Corentium Homewas usedfor one month radon measurementsduring heating season 2018/19.The dailyaveraged radon concentrationsvaried from 37-573 Bq/m3for ten selectedworkrooms, while hourly averaged radon measurements showed extreme varia ...
Chemosphere
(Elsevier)
• 01 Apr 2024
Gulan, Ljiljana • Penjišević, Ivana • Stajic, Jelena M. • Milenković, Biljana • Zeremski, Tijana • Stevanović, Vladica • Valjarević, Aleksandar
This study aims to estimate geothermal potential, radioactivity levels, and environmental pollution of sixmost popular spas in Central Serbia (Ovcar, Gornja Trepca, Vrnjacka, Mataruska, Bogutovacka and Sokobanja), as well as to evaluate potential exposure and health risks for living and visiting population. Thermal possibilities of the studied spas showed medium and low geothermal potential with totalthermal power of 0.025MW. Gamma dose rates in air varied from 63 to 178 nSv h-1. Specific activi ...
Environmental Geochemistry and Health
(Springer)
• 13 Mar 2018
Stevanović, Vladica • Gulan, Ljiljana • Milenković, Biljana • Valjarević, Aleksandar • Zeremski, Tijana • Penjišević, Ivana
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 part of Serbia. Radioactivity was determined by gamma spectrometry using HPGe detector. The obtained mean activity concentrations ± standard deviations of radionuclides 226Ra, 232Th, 40K and 137Cs were 29.9 ± 9.4, 36.6 ± 11.5, 492 ± 181 and 13.4 ± 18.7 Bq kg-1, respectively. Acc ...
Journal of Thermal Analysis and Calorimetry
(Springer)
• 09 Jul 2022
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Jovanović, Tijana • Petković, Branka • Marković, Gordana • Porobić, Slavica • Marinović-Cincović, Milena
This work investigated the thermal characteristics of irradiated composite materials formulated on the urea–formaldehyde resin (UF) and differently activated montmorillonite (K10). UF resin with molar ratio F:U = 0.8 was synthesized in situ with differently activated K10. K10 was activated by heating at 400 °C, with sulfuric acid (H2SO4) without and with magnetic stirring. The samples are marked with TK10, AK10, ASK10, UF/TK10, UF/AK10, and UF/ASK10, respectively. The samples were identified b ...
Journal of Thermal Analysis and Calorimetry
(Springer)
• 11 Feb 2022
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Jovanović, Tijana • Petković, Branka • Marković, Gordana • Porobić, Slavica • Marinović-Cincović, Milena
In this study, the thermal and hydrolytic properties of composite systems based on the urea–formaldehyde resin (UF) and eco-friendly montmorillonite (K10) as formaldehyde (FA) scavenger were examined. UF resin with molar ratio FA:U = 0.8 was synthesized in situ with inactivated, and activated K10. K10 was activated by sulfuric acid (H2SO4) with and without magnetic stirring. The samples are marked with K10(H2SO4),K10(H2SO4)ST, UF/K10(H2SO4), and UF/K10(H2SO4)ST, respectively. X-ray diffraction a ...
Forests
(MDPI)
• 01 Apr 2024
Gulan, Ljiljana • Stajic, Jelena M. • Zeremski, Tijana • Durlević, Uroš • Valjarević, Aleksandar
In urban areas, forest patches and parks are usually the places where people spend most of their time outdoors. Due to the poor environmental protection policy and insufficient investment in industry and energy, Serbia is often ranked among the countries with the highest environmental pollution in Europe. In recent years, ecological protests have been organized all over the country with the aim of raising ecological awareness and resolving environmental issues. The topic has become particularly ...
(Hindawi)
• 03 Jan 2014
Valjarević, Aleksandar • Živković, Dragica • Valjarević, Dragana • Stevanović, Vladica • Golijanin, Jelena
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 1969, 1974, and 1984 were used, while in 2012 the land cover map obtained by using CORINE-like approach was used. Topographic maps are developed by aerial campaign, and today they are replaced by satellite images. Topographic maps were scanned, and raster form was transformed t ...
