Bulletin of Natural Sciences Research
• 01 Apr 2024
Gulan, Ljiljana • Jakšić, Tatjana • Milenković, Biljana • Stajić, Jelena
This paper deals with investigations of elemental concentrations and soil-to-moss transfer factors of radionuclides in area of municipalities Kosovska Mitrovica and Zubin Potok. Twelve samples of soil and moss Hypnum cupressiforme Hedw. were collected during May 2018. Transfer factors of radionuclides: 226Ra, 232Th, 40Kand 137Cs were calculated with regard to elemental concentrations of radionuclides in soil and moss samples. Analysis was done in order to indicate the different ways of adopting ...
Information
(MDPI)
• 27 Oct 2020
Perić, Zoran • Denić, Bojan • Savić, Milan • Despotović, Vladimir
A compression method based on non-uniform binary scalar quantization, designed for
the memoryless Laplacian source with zero-mean and unit variance, is analyzed in this paper. Two quantizer design approaches are presented that investigate the effect of clipping with the aim of reducing the quantization noise, where the minimal mean-squared error distortion is used to determine the optimal clipping factor. A detailed comparison of both models is provided, and the performance evaluation in a wide ...
Bulletin of Natural Sciences Research
(Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica)
• 01 Apr 2024
Ristić, Milenko • Dekić, Biljana • Radulović, Niko • Aksić, Marija
In this research, the synthesis of a new azine derivative with coumarin moiety was performed in three reaction steps, starting from 4-hydroxycoumarin. The first step in synthesis was the acetylation of 4-hydroxycoumarin to yield 3-acetyl-4-hydroxycoumarin and then the obtained 3-acetyl-4-hydroxycoumarin was reacted with hydrazine hydrate and give a corresponding hydrazone. Condensation of the hydrazone with 4-ethoxy-3-methoxybenzaldehyde afforded the target compound 1-[1-(4-hydroxy-2-oxo-2H-chro ...
UNIVERSITY THOUGHT Publication in Natural Sciences
(Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica)
• 01 Apr 2024
Dekić, Vidoslav • Radulović, Niko • Ristić, Milenko • Dekić, Biljana • Ristić, Novica
This research involves the reaction of 4-chloro-3-nitrocoumarin and (4-methoxyphenyl)methanamine, whereby a novel coumarin derivative 4-[(4-methoxybenzyl) amino]-3-nitro-2H-chromen-2-one was obtained in good yield. The reaction was carried out in ethyl acetate, in the presence of triethylamine. Also, a detailed spectral analysis of a new coumarin derivative is presented. Resonance assignment was achieved using one- (1H NMR and 13C NMR) and two-dimensional NMR techniques (1H-1H-COSY, NOESY, HSQC, ...
UNIVERSITY THOUGHT Publication in Natural Sciences
(Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica)
• 01 Apr 2024
Dekić, Vidoslav • Ristić, Novica • Dekić, Biljana • Ristić, Milenko
Considering the facts that phenolic compounds have many pharmacological effects, as well that antioxidant effect of phenolic compounds has been proven in various experimental systems, aim of this research was to determine the content of total phenols and flavonoids and evaluation of antioxidant activity in ethanol, ethyl acetate and chloroform extracts of fruits and leaves of the plant species Crataegus monogya Jacq., which is known as common hawthorn. The content of total phenolic compounds was ...
UNIVERSITY THOUGHT Publication in Natural Sciences
(Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica)
• 01 Apr 2024
Ristić, Novica • Radulović, Niko • Dekić, Biljana • Ristić, Milenko • Dekić, Vidoslav
Synthesis, spectral characterization, and evaluation of in vitro antioxidant activity of a new coumarin derivative, 4- ((1,3,4-thiadiazol-2-yl)amino)-3-nitro-2H-chromene-2-one, are described. The synthesis of the new product was performed in three reaction steps, with a good overall yield (78%). The structure was corroborated by detailed spectral analysis, including the 1D and 2D NMR experiments (1H- and 13C NMR; 1H-1H COSY, NOESY, HSQC, and HMBC). The in vitro antioxidant activity was evaluated ...
University Thought - Publication in Natural Science
• 23 Jun 2019
Djosić, Danijel • Stefanović, Caslav • Milić, Dejan • Stefanović, Mihajlo
The paper takes into consideration dual-branch selection combining (SC) diversity reception technique in the presence of dissimilar fading at their branches. We efficiently obtained first and second order closed form statistics at the output of the considered model such as probability density function (PDF), cumulative distribution function (CDF) and average level crossing rate (aLCR). Moreover, obtained results are numerically presented for various sets of system model parameters and mainly con ...
