Природно-математички факултет: Recent submissions
Prikaz rezultata 141-160 od 269
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Софтверски пакет као интерактивни алат у настави физике
(Природно‐математички факултет, Скопје, 2022-05-08)Развој савремених технологија утиче на промену живота људи све већом брзином. Напредак технологије омогућава примену великог броја мултимедијалних уређаја помоћу којих се ученицима могу приближити и поједноставити појаве ... -
Optical light beam propagation control trought the defect in one-dimensionalphotonic lattice
(University in Banjaluka, Faculty of Technology, 2022-10-22)Photonic lattices represent are periodic structures, suitable for investigation of wave propagation and localization. Within these systems, different phenomenon such as discrete difraction, lattice solitons, Anderson ... -
A study of pv system application on the sustainable development in Serbia, XIV Conference of Chemists
(University in Banjaluka, Faculty of Technology, 2022-10-22)Climate change is one of the most significant environmental problems and is affecting the entire global population. Renewable sources of energy (RES) are vital to deal with this problem. Solar energy, especially ... -
Modeling of power flow in multimode W-type photonic crystal fibers
(МИНИСТЕРСТВО НАУКИ И ВЫСШЕГО ОБРАЗОВАНИЯ РОССИЙСКОЙ ФЕДЕРАЦИИ Некоммерческое акционерное общество «Алматинский университет энергетики и связи имени Гумарбека Даукеева» Федеральное государственное бюджетное образовательное учреждение высшего образования «Казанский государственный энергетический университет», 2023-01-01)In this paper recent advances in application of power flow equation to Wtype photonic crystal fibers (PCF) is presented. As known for many years power flow equation has been proven to be best solution when transmission ... -
Radon levels and indoor air quality after application of thermal retrofit measures - a case study
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 ... -
Identification of high radon dwellings, risk of exposure, and geogenic potential in the mining area of the “TREPČA” complex
This study was performed to investigate radon levels in dwellings in the mining area near the town of Kosovska Mitrovica. The Passive radon technique based on the charcoal canister test kit conducted in summer and autumn ... -
Plant uptake and soil retention of radionuclides and metals in vineyard environments
In most European countries, each adult citizen drinks on averagemore than 20 L of wine every year. Three popular wine-growing areas (Aleksandrovac, Topola, and Orahovac) in Serbia were studied in order to investigate the ... -
Mosses as bioindicators of radionuclide and metal pollution in northern Kosovo and Metohija mountain region
The study investigates mosses (Hypnum cupressiforme Hedw.) as bioindicators of pollution in three non-urban mountain areas of northern Kosovo and Metohija regions. Concentrations of radionuclides and metals were measured ... -
Spa environments in central Serbia: Geothermal potential, radioactivity, heavy metals and PAHs
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 ... -
Effective doses estimated from the results of Direct Radon and Thoron Progeny Sensors (DRPS/DTPS), exposed in selected regions of Balkans
The main contribution to population exposure is due to radon and thoron progenies and not radon itself. The aim of this study was therefore to estimate annual effective dose using the results of Direct Radon and Thoron ... -
Environmental radioactivity with respect to geology of some Serbian spas
(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 ... -
Environmental risk assessment of radioactivity and heavy metals in soil of Toplica region, South Serbia
(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 ... -
The floral scent of Dianthus cruentus Griseb. (Caryophyllaceae)
The genus Dianthus L. (Caryophyllaceae) comprises over 300 species of herbaceous plants that are spread over a vast area, especially in the Mediterranean region. Species of this genus, represented with 38 taxa in the Serbian ... -
Synthesis, complete assignment of 1H- and 13C-NMR spectra and antioxidant activity of new azine derivative bearing coumarin moiety
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 ... -
Synthesis and complete NMR spectral assignments of new benzylamino coumarin derivative
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 ... -
Phenolic and flavonoid content and antioxidant evaluation of hawthorn (Crataegus Monogyna Jacq.) fruits and leaves extracts
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 ... -
Synthesis and antioxidant activity of a new 4-aminocoumarin derivative
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 ... -
Small deformations, variations and energies of curves
Contrary to isometries as transformations that preserve distances, in- finitesimal bending is a type of small deformation in which the arc length is invariant with appropriate precision. The influence that given ... -
Knot Energy
(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 ... -
Antimicrobial activity of new mixed azines of coumarins and heteroaryl aldehydes
The azine functional group is a part of numerous compounds exhibiting a range of pharmacological activities. As part of our continuous search for new pharmacologically active compounds, we designed, synthesized, and ...