Zbornik radova sa Međunarodne konferencije o nastavi fizike i srodnih nauka
(Društvo fizičara Srbije, Beograd)
• 07 Oct 2018
Gulan, Ljiljana • Vučković, Biljana • Kevkić, Tijana • Drljača, Branko
Sistematska merenja koncentracije radona se najčešće izvode na slučajnim uzorcima stambenih objekata. Međutim, škole se mogu pokazati kao pogodniji izbor, jer su uniformno raspoređene po celoj teritoriji područja ili naselja, na način da se njihova prostorna raspodela može dovesti u vezu sa gustinom naseljenosti, tako da manji broj merenja može dati relevantne podatke. U cilju kontorole i zaštite dece i odraslih sprovedena istraživanja izlaganja populacije radonu u školama u većini evropskih zem ...
Zbornik radova sa Međunarodne konferencije o nastavi fizike I srodnih nauka, Subotica 2018
(Društvo fizičara Srbije, Beograd)
• 07 Oct 2018
Vučković, Biljana • Gulan, Ljiljana • Kevkić, Tijana • Živković Radovanović, Jelena
Prirodno pozadinsko zračenje koje se registuje u normalnim uslovima potiče od kosmičkog zračenjai prirodnih radionuklida, a zavisi od geologije tla i nadmorske visine mernog mesta, pa je karakteristično za neki prostor. Ono što definiše jačinu zračenja je vrednost ambijentalnog doznog ekvivalenta gama zračenja. Rezultati predstavljeni u ovom radu jedna su od eksperimentalnih vežbi u okviru predmeta Dozimetrija i zaštita od zračenja na odseku za fiziku Prirodno-matematičkog fakulteta. Istraživanj ...
ICEST 2019, Proceedings of papers
• 01 Jul 2021
Zlatković, Dragan • Denić, Nebojša • Ilić, Miloš • Petrović, Milena
The process of developing e-learning is based on standards in the field of information security (ISO) and learning technologies (IEEE, IMS), and criteria for quality assurance have been taken as input parameters. The overall development was carried out through the PDCA cycle and with upgraded LTSA architecture.
Zbornik radova XXX Simpozijuma DZZSCG, Divčibare 2019
(Institut za nuklearne nauke „Vinča―Društvo za zaštitu od zračenja Srbije i Crne Gore)
• 04 Oct 2019
Gulan, Ljiljana • Ivanović, Đorđe • Vučković, Biljana
Грађевински материјали (гранит, песак, шљунак, камен, и др.) садрже природне радионуклиде пореклом из земље. Да би анализирали утицај грађевинских материјала на концентрацију радона у објектима старије градње, спроведено је истраживање у седам специфичних кућа на простору северног дела Косова и Метохије. Изабране су породичне куће са подрумом, старости од 30-120 година, изграђене од различитих грађевинских материјала. Детектори радона Airthings Corentium Home, засновани на алфа спектрометријском ...
19th International Symposium INFOTEH-JAHORINA, 18-20 March 2020
• 18 Mar 2020
Mihajlov Carević, Miroslava • Petrović, Milena • Nebojša, Denić
In this paper, we deal with the dominating set and the domination number of rhomboidal cactus chains. We determine minimum dominating sets and domination numbers of two special types of rhomboidal cactus chains, meta and ortho-chains. Thereafter, we determined the minimum dominating set for the icosahedral hexagonal network. Keywords: dominating set; rhomboidal cactus chains; icosahedral hexagonal network.
МЕЂУНАРОДНО саветовање Управљање знањем и информатика (6 ; 2020 ;Копаоник)
(Управљање знањем - Зборници)
• 13 Jan 2020
Zlatković, Dragan • Denić, Nebojša • Petrović, Milena • Ilić, Dejan
Ово је концептуални рад на проучавању употребе електронских уџбеника (е-уџбеник)
као алата за е-учење. Истраживачки рад разматра литературу о основним концептима е-
уџбеника. У раду се разматрају и анализирају ранија истраживања и студије о е-уџбенику и
његовој употреби у образовању, посебно у процесу наставе и е-учења. Налази укључују
вишеструке дефиниције е-уџбеника, ограничења и предности које се чине најутицајнијим у
његовој употреби у процесу е-учења и да ли су се перцепције корисн ...
International conference on Applied Internet and Information TechnologiesOctober 3-4, 2019, Zrenjanin, Republic of Serbia
• 03 Oct 2019
Zlatković, Dragan • Denić, Nebojša • Petrović, Milena
Implementation of E-Learning is one of the ways of applying modern information technologies to achieve a high quality of higher education. The transition of higher
education institutions towards E-Learning should be an integral part of strategic planning that seeks to change and improve the work of universities. This paper explains the
importance of systematic implementation of E-Learning in higher education institutions. The article analyzes internal strengths and weaknesses, as well as exter ...
(Informacione tehnologije, obrazovanje i preduzetništvo ITOP19)
• 01 Apr 2024
Zlatković, Dragan • Denić, Nebojša • Petrović, Milena • Ilić, Miloš
U nastavi studenata na visokoškolskim ustanovama i studijskim programima
elektronsko učenje ima značajnu ulogu. Cilj ovog istraživanja koje je sprovedeno na Alfa
BK Univerzitetu u Beogradu je istražiti odnos između elektronskog učenja i unutrašnje
motivacije studenata. Sveobuhvatno, rezultati ovog istraživanja potvrdili su da je
elektronsko učenje bitan elemenat koji utiče na motivaciju studenata. U metodološkom okviru istraživanja – kao instrument istraživanja, upitnik je primenjen za prik ...
(Society of Physical Chemists of Serbia)
• 28 Sep 2018
Sejdinović, Dijana • Laban, Bojana • Marković, Mirjana • Ralević, Uroš • Badnjević, Almir • Omanović Miklićanin, Enisa • Jokić, Anja • Vasić, Vesna
In this work, we present a simple green method for Ag and Au nanoparticles (NPs) synthesis in an aqueous medium. Ag and Au NPs were synthesized by chemical reduction method, using amino acid L-Methionine as reducing as well as a stabilizing agent. The size of Ag and Au NPs was controlled by changing the pH values of the reaction mixture. They were characterized by UV-Vis spectroscopy, FTIR spectroscopy, and measurement of electrophoretic properties. The size of NPs was determined by atomic force ...
(Society of Physical Chemists of Serbia)
• 28 Sep 2018
Momić, Tatjana • Lazarević-Pašti, Tamara • Laban, Bojana • Marković, Mirjana • Vasić, Vesna
Gold nanoparticles and quercetin-conjugated gold nanoparticles complex were synthesized using trisodium citrate as reducing agent. Both kinds of nanoparticles were characterized using spectrophotometry, dynamic light scattering and zeta potential measurements. Comparison of the results confirmed successful synthesis of quercetin-conjugated gold nanoparticles complex.
(Српско хемијско друштво)
• 19 Jun 2022
Laban, Bojana • Vujačić Nikezić, Ana
U poslednje vreme intenzivno se ispituju nanočestice metala za primenu u medicini kao nosači lekova i drugih biološki važnih molekula, koji bi poboljšali stabilnost leka i terapeutsku efikasnost. U ovom radu je ispitana adsorpcija fluorescentne boje indocijanin zeleno (ICG) na površini nanočestica srebra i zlata. Nanočestice srebra i zlata dobijene su zelenom sintezom u prisustvu aminokiseline L-metionina kao redukcionog i stabilizacionog sredstva. Dobijene su nanočestice sfernog oblika, negativ ...
27th Telecommunications forum TELFOR 2019
(27th Telecommunications forum TELFOR 2019)
• 27 Nov 2019
Marković, Aleksandar • Perić, Zoran • Panić, Stefan
The closed-form expression for Q-function does not exist so it is necessary to develop its approximation in order to overcome the difficulties that might appear in diverse
research areas. In this paper the authors are presenting overview of two improved models for Q-function approximation with wide applicability. The first one is based
on Karagiannidis and Mils model and the second one is based on Borjesson model to obtain the desired improved form of Qfunction approximation.
Physical Chemistry 2018, 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry
• 01 Apr 2024
Pergal, Marija • Kuč, Dragana • Kodranov, Igor • Pergal, Miodrag • Stanković, Dalibor • Petković, Branka • Manojlović, Dragan
In the present study, the degradation of azamethiphos using chlorine dioxide was studied. The optimization of the azamethiphos degradation in terms of chloriпe dioxide dosage, different time of degradation and at different рН values, was performed in system with deionized water. The degradation was monitored using high performance liquid chromatography (НPLC-DAD) analysis. It was found that complete degradation was achieved with optimal concentration of 5 mg/dm3 chlorine dioxide at concentration ...
Physical Chemistry 2018, 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Belgrade
• 01 Apr 2024
Vukojević, Vesna • Đurđić, Slađana • Jevtić, Sonja • Pergal, Marija • Petković, Branka • Stanković, Dalibor
In this work, for the first time, we proposed electrochemical behavior and development of analytical procedure for quantification of pesticide azamethiphos, using boron doped diamond (BDD) electrode. It was found that azamethiphos electrochemical behavior is irreversible oxidation at potential of around 1.70 V, in 1 M nitric acid. Square wave voltammetric technique was most appropriate for azamethiphos quantification. Under optimized experimental conditions linear working range from 2 to 1ОО μ ...
Proceedings of the CODEMA 2020
(Union od Mathematicians of Macedonia – ARMAGANKA)
• 01 Apr 2024
Najdanović, Marija • Velimirović, Ljubica • Rančić, Svetozar
In this paper we point out the geometric aspect of knots. By the term
knot we mean a closed self-avoiding curve in a 3-dimensional Euclidean space.
We consider infinitesimal bending of knots and examine the behavior of torus
knots under this type of deformation.
The Secend International Conference on Sustainable Enviroment and Technologies, 23-24 September 2022, Belgrade, Serbia
• 01 Apr 2024
Laban, Bojana • Milenković, Mila • Petković, Branka
In this work, we present a review of the simple synthesis of iron(III)-oxide nanoparticles (Fe2O3 NPs), their characterization and potential application as nanosorbents and voltammetric sensors. Fe2O3 NPs were obtained from Fe2+ and Fe3+ salts by the solid-state method and characterized by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), Ultraviolet-visible spectroscopy (UV-Vis) and Fourier-transform infrared spectroscopy (FTIR). The morphology and average size of Fe ...
57th meeting of the Serbian Chemical Society, Kragujevac, Serbia, June 18/19, 2021
• 01 Apr 2024
Pantović, Tijana • Jovanović, Filip • Petković, Branka • Laban, Bojana
Nanočestice metala i oksida metala (NPs) privlače pažnju mnogih istraživača zbog svojih jedinstvenih optičkih i električnih svojstva. Ove nanočestice nalaze primenu u biologiji, medicini, kao i u elektronici, za izradu senzora. U ovom radu sintetisane su nanočestice srebra (Ag NPs) i gvožđe(III)-oksida (Fe2O3 NPs), jednostavnom „solid-state“ metodom iz čvrstog stanja uz prisustvo različitih soli kao stabilizatora. Sintetisane su Ag i Fe2O3 NPs uz trinatrijum citrat kao stabilizator, kao i Fe2O3 ...
8th SYMPOSIUM Chemistry and Enviromental Protection, 30.05.-01.06. 2018. Kruševac, Serbia
• 01 Apr 2024
Jevtić, Sonja • Vukojević, Vesna • Đurdjić, Slađana • Pergal, Marija • Manojlović, Dragan • Petković, Branka • Stanković, Dalibor
Pethoxamid (РОА) is relatively new herbicide and it belongs to group of chloroacetamides. lt inhibits the germination of target weeds in com, soybeans, peas and beans, tobacco and other crops and it can affects on herbicide-resistant weeds. There are no many research records about this, in the future quite applicable, herbicide. Bearing in mind that pethoxamid is high soluble in water, with almost no sorption in soils [1], the leaching and runoff of this compound in ground and surfac ...
8th SYMPOSIUM Chemistry and Enviromental Protection, 30.05.-01.06. 2018. Kruševac, Serbia
• 01 Apr 2024
Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Jevtić, Sonja • Petković, Branka • Marković, Gordana • Marinović-Cincović, Milena
Zbog emisije formaldehida (СН2О) iz drvenih proizvoda, gde se urea- formaldehidne (UF) smole, izmedu ostalog, koriste za impregnaciju drvenih panela koje se koriste u unutrasnjosti stambenih i drugih objekata pozeljno је da procenat slobodnog formaldehida (СН2О) u samoj smoli bude sto manji, jer је poznato da formaldehid ima stetno dejstvo na coveka, odnosno сео zivi svet. Pare formaldehida jako nadrazuju disajne puteve. Koncentracije od 10-20 ppm otezavaju disanje, а konc ...
56th meeting of the Serbian Chemical Society, Niš, Serbia, June 7/8, 2019
• 01 Apr 2024
Laban, Bojana • Veljović, Đorđe • Petković, Branka • Jokić, Anja
Nanočestice plemenitih metala (NPs) od velikog su interesa zbog svojih izvanrednih optičkih, hemijskih i fizičkih svojstava1. Nanočestice srebra (Ag NPs) privukle su posebnu pažnju zbog njihove primene u različitim oblastima. Ag NPs čestice najčešće se dobijaju redukcijom jona Ag+ u vodenim rastvorima. Međutim, koloidne disprezije su stabilne samo pri niskim koncentracijama metala i teško je dobiti prah NPs iz njihovih disperzija. U literaturi je objavljena sinteza praha Ag NPs primenom skroba m ...
56th meeting of the Serbian Chemical Society, Niš, Serbia, June 7/8, 2019
• 01 Apr 2024
Savić, Nada • Glišić, Biljana • Petković, Branka • Wadepohl, Hubert • Vojnović, Sandra • Nikodinović-Runić, Jasmina • Djuran, Miloš
U ovom radu, N,N',N'',N'''-tetrakis(2-piridilmetil)-1,4,8,11-tetraazaciklotetradekan (tpmc) kao makrociklicni ligand sa 2-piridilmetil grupama je korišćen za sintezu kompleksa srebra(I). Različite AgX soli (X = CF3SO3-, CF3COO- i BF4-) su korišćene za sintezu u cilju ispitivanja uticaja kontra-anjona na nuklearnost, stabilnost i biološku aktivnost kompleksa. Sintetisani kompleksi srebra(I) su okarakterisani primenom različitih spektroskopskih metoda, ciklične voltametrije i rendgenske strukturne ...
56th meeting of the Serbian Chemical Society, Niš, Serbia, June 7/8, 2019
• 01 Apr 2024
Milenković, Mila • Jevtić, Sonja • Laban, Bojana • Petković, Branka • Jokić, Anja
Nanočestice na bazi oksida gvožđa (NPs) su privukle veliku pažnju imajući u vidu njihove fizičke, posebno magnetne, i hemijske osobine. U ovom istraživanju su nanočestice gvožđe(III)-oksida (Fe2O3 NPs) sintetisane jednostavnim hemijskim metodom u čvstom stanju iz dve različite soli, FeSO4 . 7H2O i FeCl3 . H2O, u molskom udelu (1 : 2,5). Veličina NPs od 3 nm i njihov sferni oblik su određeni TEM merenjima. Dobijene NPs su dispergovane u vodi i monodisperzni koloid je okarakterisan UV-Vis i FTIR s ...
Twenty-first YUCOMAT 2019 & Eleventh WRTCS 2019, Herceg Novi, September 2 - 6, 2019
• 01 Apr 2024
Petković, Branka • Stanković, Dalibor • Ognjanović, Miloš • Viktorovich Avdin, Vyacheslav • Radović, Magdalena • Manojlović, Dragan • Vranješ Đurić, Sanja
The novel carbon material modified with Co3O4 particles, prepared by calcination and mixed with single wall carbon nanotubes, was characterized and used for sensing of prominent antioxidant α- lipoic acid (LA). The new material was prepared by thermolysis of Novolac phenol-formaldehyde resin and cobalt(III) nitrate mixed with graphite powder, producing mostly glassy carbon decorated with cobalt oxide. XRD and SEM measurements were used to study composition, structure and morphology of cobalt oxi ...
INFOTEH-JAHORINA (INFOTEH 2020)
(2020 19th International Symposium INFOTEH-JAHORINA (INFOTEH))
• 16 Apr 2020
Vasić, Nikola • Stefanović, Dušan • Rančić, Dejan • Milić, Dejan • Đošić, Danijel
This paper presents initial results of a research towards statistical description of diversity-combined wireless signals that propagate over different environments. This kind of situation is encountered when receiver has multiple input antennas which are positioned in such a way that the fading environment cannot be considered uniform for all propagating paths of signals. We consider a three-input selection combining (SC) combiner with three different fading statistics on each of them, and deriv ...
UNITECH 2018, International Scientific Conference, 16-17 November, Gabrovo 2018, Bulgaria
(TECHNICAL UNIVERSITY OF GABROVO, 2018 UNIVERSITY PUBLISHING HOUSE “V. APRILOV” – GABROVO, 2018)
• 01 Apr 2024
Vujaković, Jelena • Panić, Stefan • Kontrec, Nataša
In real iterations, several types of mean value theorems for definite integrals are used. In complex domain, we cannot specifically formulate the mean value theorem of a particular complex line integral (L) ∫f(z)dz , since we are unable to give an appropriate geometric interpretation of the integral over the surface below a curve L (from z0 to z1 ). Based on the
mean value theorems for a complex line integral in [Vujakovic J., The mean value theorem of line complex integral and Sturm functio ...
UNITECH 2018, International Scientific Conference, 16-17 November, Gabrovo 2018, Bulgaria
(TECHNICAL UNIVERSITY OF GABROVO, 2018 UNIVERSITY PUBLISHING HOUSE “V. APRILOV” – GABROVO, 2018)
• 01 Apr 2024
Vujaković, Jelena • Kontrec, Nataša • Panić, Stefan
The theory of complex differential equations represents an important mathematical discipline both from the theoretical point of view and from numerous applications. Its development was equally encouraged by mathematicians, physicists and engineers. By using the series-iterations method we have explained how the obtained results could be
applied to the complex linear homogeneous first order and canonical complex linear second order differential equations. We have also formulated some conclusi ...
International Scientific Conference UNITECH 2019, Gabrovo, 15-16 November 2019, Bulgaria
(TECHNICAL UNIVERSITY OF GABROVO, 2019 UNIVERSITY PUBLISHING HOUSE “V. APRILOV” – GABROVO, 2019)
• 01 Apr 2024
Vujaković, Jelena • Kontrec • Panić, Stefan
The problem of location of the zero solution of the second order complex oscillator equation for the given analytic function is unlikely to be completely solved. Therefore, estimates have long been resorted to. The easiest case is if the zeros are aligned at the same direction, which is rare. Since there are no other zeros between the two directions, we will assume that there are many zeros on practically every direction in the sector
International Scientific Conference UNITECH 2019, Gabrovo, 15-16 November 2019, Bulgaria
(TECHNICAL UNIVERSITY OF GABROVO, 2019 UNIVERSITY PUBLISHING HOUSE “V. APRILOV” – GABROVO, 2019)
• 01 Apr 2024
Vujaković, Jelena • Jovanović, Tanja • Kontrec, Nataša
By solving the frequency function equation only a small number of complex equations of the second order oscillations can be solved. The simplest way is to observe canonical complex differential equations with constant coefficient. In this paper we give an overview of eight cases of complex differential equations in which the coefficient is a polynomial or a variable coefficient
Mathematics, its Applications and Mathematical Education (MAME’20), Proceedings of the VII International Conference, September 7 – 12, 2020, Ulan-Ude, Baikal
(Ulan-Ude , Publishing Department of East Siberia State University of Technology and Management)
• 01 Apr 2024
Taseiko, Olga • Milošević, Hranislav • Vujaković, Jelena • Kontrec, Nataša • Panić, Stefan
В работе рассмотрены водные экосистемы как элементы единой социально природно-техногенной системы, предлагаемой для решения задач управления развитием промышленных территорий. Для оценки территориальных рисков водных экосистем отдельных регионов СФО предложен метод, сочетающий иерархический кластерный анализ и вероятностные оценки реализации негативных воздействий.
Proceeding of the CODEMA 2020 - Зборник на трудови од CODEMA
(Union od Mathematicians of Macedonia – ARMAGANKA)
• 01 Apr 2024
Vujaković, Jelena • Paunović, Ljiljana • Taseiko, Olga
The opinion is that the most important result in the metrical theory of
fixed points is the famous Banach contraction principle from 1922. It has been
generalized and extended in several directions. One of the most interesting
extensions was provided by Wardowski in 2012. He described a new
contraction, so–called F-contraction and proved that every F-contraction has a
unique fixed point, where F:(0,+infinity)->(0,+infinity) satisfies conditions (F1 ), (F2 ) and (F3). Several authors general ...
ICPRSE – International Conference on Teaching Physics and Related Sciences
• 07 Oct 2018
Kevkić, Tijana • Vučković, Biljana • Gulan, Ljiljana • Drljača, Branko
This paper oresents the results if measurements of ultraviolet radiation in Kuršumlija - Blace on July 15th 2018, and in Kruševac - Trstenik on July 16th 2018.
ICPRSE – International Conference on Teaching Physics and Related Sciences
• 07 Oct 2018
Gulan, Ljiljana • Vučković, Biljana • Kevkić, Tijana • Drljača, Branko
Sistemska merenja koncentracije radona senajčešće izvode na slučajnim uzorcima stambenih objekata.
ICPRSE – International Conference on Teaching Physics and Related Sciences
• 07 Oct 2018
Drljača, Branko • Đokić, Boban • Šiljić, Ivan • Kevkić, Tijana • Gulan, Ljiljana
Veliki broj osnovnih i srednjih škola u Republici Srbiji nije adekvatno opremeljen za izvođenje nastave fizike. Tu se pre svega misli na nedovoljnu opremljenost kabineta za nastavu fizike, kojima često nedostaje oprema za izvođenje nastave fizike.
ICPRSE – International Conference on Teaching Physics and Related Sciences
• 19 Dec 2019
Drljača, Branko • Đokić, Boban • Spasić, Dušica
Na osnovu pregleda najsavremeniji nastavni proces fizike u osnovnim školama svake godine postaje izazovniji. Glavno pitanje je kako pronaći prikladna sredstva za približavanje fizike učenicima. Na fizici primarnog nivoa je često teško objasniti fizičke procese zbog relativno visokog nivoa zamišljenosti. Škole smeštene u gradovima uglavnom su opremljene nastavnim alatima koji se mogu koristiti u nastavi fizike. S druge strane, škole u seoskim oblastima Srbije slabo su ili nisu opremljene nastavni ...
Зборник на трудови Трета меѓународна конференција за образованието по математика, физика и сродни науки
(Природно‐математички факултет, Скопје)
• 08 May 2022
Đokić, Boban • Milentijević, Miljana • Drljača, Branko
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 које је тешко дочарати помоћу
стандардних метода предавања табла, креда и презентација. У овом раду је кроз неколико
примера из физике, у оквиру једне наставне теме, предложено могуће решење за извођење
наставе у школама које немају адекватно опремљене кабинете за наста ...
XIV Conference of Chemists, Technologists and Ecologists of the Republic of Srpska Banja Luka, Bosnia and Hercegovina
(University in Banjaluka, Faculty of Technology)
• 22 Oct 2022
Jovanović, Slavica • Todorović, Dragana • Stojanović-Krasić, Marija • Kevkić, Tijana • Milojević, Nenad • Drljača, Branko
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 localization and defects localizations can be analyzed. The lattice periodicity in
one or more dimensions leads to the zonal structure in terms of existing permitted and forbidden
zones which can allow or stop light beam propagation. Manipulation with the zonal structure can ...
Technologists and Ecologists of the Republic of Srpska Banja Luka, Bosnia and Hercegovina
(University in Banjaluka, Faculty of Technology)
• 22 Oct 2022
Todorović, Dragana • Jovanović, Slavica • Kevkić, Tijana • Stojanović Krasić, Marija • Milojević, Nenad • Drljača, Branko
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 photovoltaic (PV) technologies, is one of the most promising renewable energy
sources and is, therefore, one of the fastest-growing industries in this field. Thus, this paper focuses
on the performance analyses of rooftop on-grid PV system in real climatic conditions in Niš
(Se ...
International Scientific and Technical Conference “Energy, Infocommunication Technologies and Higher Education”
(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»)
• 01 Jan 2023
Drljača, Branko • Savović, Svetislav • Kovačević, Milan S. • Simović, Ana • Kuzmanović, Ljubica • Djordjevich, Alexandar • Yussupova, Gulbakhar
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 characteristics of multimode
optical fibers are to be modeled. Transmission properties of multimode optical fibers depend
strongly upon modal dispersion, mode-dependent attenuation and the rate of mode coupling.
Throughout years different simulation models have been develo ...
XXI Geometrical Seminar, Book of Abstracts
(Faculty of Mathematics, University of Belgrade, Serbia)
• 01 Apr 2024
Najdanović, Marija
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 deforma-
tions have on geometric quantities is measured by variations. In this talk we
discuss the infinitesimal bending of curves and variations of their energies.
In particular, we consider spherical curves and an infinitesimal bending field
that leaves a given curve on a sphere ...
Proceedings of the 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces & Related Problems
(Kyung Hee University , RIRCM, OCAMI & BK21PLUS)
• 31 Jul 2019
Velimirović, Ljubica • Najdanović, Marija • Rančić, Svetozar
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 torsion and total normalcy
under infinitesimal bending of knots is considered. Our visualization tool devoted
to visual representation of infinitesimal bending of knots is used to present the
deformation.
58th MEETING OF THE SERBIAN CHEMICAL SOCIETY Book of Abstracts
(Serbian Chemical Society)
• 01 Apr 2024
Ristić, Milenko • Dekić, Biljana • Radulović, Niko • Stojanović-Radić, Zorica • Dekić, Vidoslav • Aksić, Marija • Janićević, Suzana
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 spectrally characterized a series of
mixed azines containing coumarin and another heterocyclic moiety. Antimicrobial activity
of the synthesized compounds was evaluated by a microdilution assay against five
different microorganisms, namely Gram-positive bacteria (Staphylococcus ...
56th MEETING OF THE SERBIAN CHEMICAL SOCIETY Book of Abstracts
(Serbian Chemical Society)
• 01 Apr 2024
Ristić, Milenko • Radulović, Niko • Dekić, Biljana • Ristić, Novica • Dekić, Vidoslav
During our previous work, we prepared a series of mixed azines with a coumarin moiety and
different benzaldehydes, and tested their acute toxicity and antioxidant activity. Since
heterocyclic compounds possess a broad range of biological activities, in the continuation
of our work, we designed, synthesized and fully spectrally characterized a series of new
mixed azines starting from 3-acetyl-4-hydroxycoumarin and different heteroaromatic
aldehydes. The synthesized compounds were evaluated f ...
55th Meeting of SCS, Book of Abstracts
(Serbian Chemical Society)
• 01 Apr 2024
Radulović, Niko • Ristić, Milenko • Mladenović, Marko • Ristić, Novica • Dekić, Vidoslav • Dekić, Biljana • Ranđelović, Vladimir
Detailed GC and GC-MS analysis of a diethyl ether washings of fresh flowers of Dianthus cruentus Griseb. (Caryophyllaceae) enabled the identification of 153 constituents. The major identified compounds were long-chain n-alkanes - pentacosane (5.0 %), heptacosane (19.5 %) and nonacosane (6.5 %). Detailed analyses, in combination with synthesis and chemical transformations (transesterification and synthesis of dimethyl disulfide adducts), led to the identification of a homologous series of n-, iso ...
Proceedings XXIII YuCorr, International Conference Meeting Point Of The Science And Practice In The Fields Of Corrosion, Materials And Environmental Protection. May 16-19, 2022, Divčibare, Serbia. pp.229-234.
• 01 Apr 2024
Mitrovic, Marija • Lempic, Aleksandra • Gulan, Ljiljana
This paper presents the results of radon concentration in ground floor dwellings in the vicinity of the "Trepča" mine. Earlier studies on radon in the area of Kosovska Mitrovica have shown that there are dwellings with high values of this radioactive gas, which can be related to technological activities that can change the concentrations of natural radioactive materials in the environment. According to the World Health Organization, radon is the second leading cause of lung cancer after smoking. ...
Proceedings XXIII YuCorr, International Conference Meeting Point Of The Science And Practice In The Fields Of Corrosion, Materials And Environmental Protection. May 16-19, 2022, Divčibare, Serbia.pp.223-228
• 01 Apr 2024
Gulan, Ljiljana • Jovanović, Stanimirka • Mitrović, Marija • Stajić, Jelena M.
In this paper, the specific activities of radionuclides in ash and ambient dose equivalent rate of gamma radiation in the air in the vicinity of the thermal power plant (TPP) "Kosovo B", Obilić were measured. Five samples for determination the activity of radionuclides in the ash by gamma spectrometric method were taken from the ash dump of the TPP "Kosovo B". The specific activities of the radionuclide 226Ra in the ash are in the range of 9.5 ± 0.6 Bq/kg - 22.4 ± 0.8 Bq/kg. The specific activit ...
Zbornik radova XXXI Simpozijum DZZSCG, Beograd, 6-8. oktobar 2021
• 01 Apr 2024
Gulan, Ljiljana • Forkapić, Sofija • Spasić, Dušica • Živković Radovanović, Jelena • Vučković, Biljana • Hansman, Jan • Lakatoš, Robert
Visoke koncentracije radona zabeležene su u jednoj kući u naselju Rudare u blizini
rudarskog kompleksa “Trepča”. Ugljeni kanisteri izlagani po 48 sati u julu, novembru i
decembru 2019 pokazali su vrednosti koncentracije radona: 16273±162, 962±17,
144±7 Bq/m3, respektivno. Istovremeno sa ugljenim kanisterima koncentracija radona
merena je aktivnom metodom (RAD7 uređajem) u novembru (u ciklusu 11x1h), i
vrednosti su opadale od 2764±212 do 1449±104 Bq/m3. Specifične aktivnosti
radionuklida 22 ...
Zbornik radova XXXI Simpozijum DZZSCG, Beograd 6-8. oktobar 2021
• 01 Apr 2024
Spasić, Dušica • Gulan, Ljiljana
U ovom radu su prikazani rezultati merenja koncentracije radona u jednoj porodičnoj
kući u blizini Kosovske Mitrovice u periodu od 24.03.2020 – 31.05.2020. Interval
merenja je obuhvatio period proglašenja vanredne situacije izazvane pandemijom
COVID-19. Merenje koncentracije radona izvršeno je sa dva aktivna detektora radona
(Airthings Corentium Home) postavljena u dnevnoj i spavaćoj sobi kuće starosti preko
30 godina. Vrednosti koncentracija radona očitavane dnevno su se kretale u opsegu ...
XXXI Simpozijum DZZSCG, Beograd 6-8. oktobar 2021.
• 01 Apr 2024
Vučković, Biljana • Đokić, Boban • Todorović, Nataša • Nikolov, Jovana • Gulan, Ljiljana
Postojanje radona u vodi za pić e dovodi do unutrašnje izloženosti, direktno (kroz
procese radioaktivnog raspadanja, ingestije i inhalacije) i indirektno (kada se
kombinuju kao deo lanca ishrane). Merenje zastupljenosti radona u vodi za piće
pomaže da se proceni rizik od izloženosti zračenju prilikom svakodnevne potrošnje
vode. U ovom radu koncentracija aktivnosti radona u vodi sa alternativnih izvora
snabdevanja na teritoriji opštine Novo Brdo merena je alfa spektrometrijskom metodom
RA ...
XXXI Simpozijum DZZSCG, Beograd 6-8. oktobar 2021
• 01 Apr 2024
Gulan, Ljiljana • Leković, Milovan • Spasić, Dušica • Vučković, Biljana
Ради процене стања радиоактивности у животној средини, спроведена су
мерења јачине амбијенталног дозног еквивалента у ваздуху на територији града
Ваљева и околине. Истраживање је спроведено Гајгер-Милеровим бројачем модел
FS2011, у јуну 2021 на 40 локација. Мерења су вршена на земљи и на висини од 1 m
у урбаном, руралном и индустријском подручју. Током мерења забележени су
параметри температуре, влажности ваздуха и атмосферског притиска на
локацијама. Истражена је корелација између мерења ...
• 01 Apr 2024
Spasić, Dušica • Gulan, Ljiljana
People are mainly exposed to radon in indoor environments. Exposure to radon and its decay products is the second leading cause of lung cancer, and there is a strong synergistic effect with smoking. The most significant source of indoor radon is usually the soil around building; radon penetrates into houses directly from the soil through fractures and cracks. In some cases the source of higher radon could be household water from drilled wells or exhalation from building materials. In the Europea ...
Proceedings of The first international conference on sustainable environment and technologies “Create sustainable community”, Belgrade, 24-25 September, 2021.
• 01 Apr 2024
Gulan, Ljiljana • Spasić, Dušica • Drobac, Boris • Bačević, Nikola
This study deals with continuous radon monitoring conducted to estimate the relationship between indoor radon measurements and potential occurrences of earthquake in the Balkan region. Radon monitoring was performed with the detector Airthings Corentium Home placed in the basement office of faculty building in Kosovska Mitrovica (N 42.897°, E 20.867°) in winter period of the 2020/21 (four months in continuity). According to the European Seismic Hazard Map this region is classified as moderate ha ...
Eight International Conference on radiation and applications in various fields of research, RAD8, Virtual Conference, Herceg Novi, Montenegro, July 20-24, 2020.
• 01 Apr 2024
Vučković, Biljana • Todorović, Nataša • Nikolov, Jovana • Gulan, Ljiljana
In the present study, the water samples were taken from public fountains in rural area
municipality of Kuršumlija, in southern part of Serbia. Sampling of water from public fountains began subsequently according to establishment role and analyzed by alpha spectrometric method using the system (RAD7 RAD H2O) (DURRANGE Co.). Values of radon concentration in water ranged from 4.4 Bq l-1 to 22.4 Bq l-1, with mean value of 13.8 Bq l-1. As can be seen, the radon concentrations in water samples from t ...
Eight International Conference on radiation and applications in various fields of research, RAD8, Virtual Conference, Herceg Novi, Montenegro, July 20-24, 2020.
• 01 Apr 2024
Gulan, Ljiljana • Spasić, Dušica • Živković Radovanović, Jelena • Drobac, Boris
In order to establish radon levels in outdoor atmosphere radon measurements were performed during the fifteen days by alpha spectrometric measuring method with detector Airthings Corentium Home. Measuring point was at 0.5 m height. Since meteorological conditions can have a significant impact on radon measurements, parameters such as temperature, humidity, precipitation, wind speed were also noted by SENCOR SWS 9700. The results of short term outdoor radon concentration were read out daily and v ...
Eight International Conference on radiation and applications in various fields of research, RAD8, Virtual Conference
• 01 Apr 2024
Gulan, Ljiljana • Forkapić, Sofija • Spasić, Dušica • Živković Radovanović, Jelena • Vučković, Biljana
Spike-like peaks in the concentration of radon gas prior to a major earthquake are attributed to release different gases (CO2, CH4, H2S, SO2, H2 suitable for the transport of radon to the earth’s surface) due to pre-seismic stress or fracturing of the rock. Passive radon technique based on charcoal canister test kit conducted in the environment of Kosovska Mitrovica in summer and autumn period showed inexplicable results. Since radon levels are sensitive to short-term fluctuations, an active tec ...
13th Simposium “Novel tehnologies and economic development”, Leskovac (2019)
(Faculty of Technology, Leskovac)
• 18 Oct 2019
Kostić, Marija • Čanaćević, Milena • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Marković, Gordana • Budinski-Simendić, Jaroslava
Montmorillonite clays are of great importance for processes such as adsorption and
catalysis and polymer composites fabrication . The textural properties of this filler can
be modified to increase their application. In this work the hydrolytic stability of
composites based on urea-formaldehyde resin (UF) and eco-friendly montmorillonite (KSF) as formaldehyde scavenger was investigated. KSF was activated by sulfuric acid (H2S04) with and without mechanical mixing .The degree activation was det ...
8. Simpozijum Hemija i zaštita životne sredine, Kruševac (2018)
(Srpsko hemijsko drustvo)
• 30 May 2018
Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Jevtić, Sonja • Petković, Branka • Marković, Gordana • Marinović-Cincović, Milena
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 je da procenat slobodnog formaldehida
(CH2O) u samoj smoli bude sto manji, jer je poznato da formaldehid ima štetno dejstvo
na čoveka, odnosno ceo živi svet. Pare formaldehida jako nadražuju disajne puteve.
Koncentracije od 10-20 ppm otežavaju disanje, a koncentracije od 650 p ...
XXIV Savetovanje o biotehnologiji, Čačak, Srbija
(UNIVERZITET U KRAGUJEVCU, AGRONOMSKI FAKULTET U ČAČKU)
• 15 Mar 2019
Budinski-Simendić, Jaroslava • Jovanović, Slaviša • Marković, Gordana • Aleksić, Vojislav • Jovanović, Vojislav • Tanasić, Jelena • Samaržija-Jovanović, Suzana
Poljoprivreda i poljoprivredna industrija zahtevaju elastomeme proizvode koji mogu izdržati dugotrajnu izloženost ekstremnim naponima i hemikalijama. Elastomeri dobijeni od etilen-propilen-dienskog kaučuka (EPDM) nalaze široku primenu u poljoprivredi. Ovaj prekursor mreže je nepolaran i materijali na osnovu njega imaju izvanrednu otpomost na uticaj ozona, visoke temperature i polame medije i zbog toga manje podležu reakcijama oksidacije i termičke degradacije. Umreženi EPDM je pogodan za upotreb ...
XXIII Savetovanje o biotehnologiji, Čačak, Srbija
(Univerzitet u Kragujevcu, Agronomski fakultet u Čačku)
• 09 Mar 2018
Kojić, Dejan • Vukić, Nevena • Samaržija-Jovanović, Suzana • Erceg, Tamara • Jovičić, Mirjana • Aleksić, Vojislav • Ristić, Ivan • Mićić, Vladan
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 praha otpadne
gume imaju veoma raznovrsnu primenu (podovi na farmama, sportski stadioni,
dobijanje pneumatika, u građevinarstvu kao materijali za zaštitu od vibracija itd). Cilj
ovog rada je bio da se dobiju elastomerni kompoziti na osnovu reciklirane gume.
Sintetisano je neko ...
2nd International conference on Advanced Production and Procesing-ICAPP 2022, Novi Sad, Serbia
(University of Novi Sad, Faculty of Technology Novi Sad)
• 20 Oct 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Kostić, Marija • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena
The effect of different montmorillonites (KSF and K10) and their modifications (Na-KSF, Na-K10) on content of formaldehyde-FA (free and liberated) modified urea-formaldehyde (UF) composites was investigated. KSF and K10 were modified by sodium chloride (NaCl). A total of four samples were synthesized, with the designations UF/KSF, UF/Na-KSF, UF/K10, and UF/Na-K10, under the same conditions. The content of free FA was determined by the bisulfite method. The hydrolytic stability of modified UF res ...
2nd International conference on Advanced Production and Procesing-ICAPP 2022, Novi Sad, Serbia
(University of Novi Sad, Faculty of Technology Novi Sad)
• 20 Oct 2022
Petković, Branka • Kostić, Marija • Samaržija-Jovanović, Suzana • Ivanović, Aleksandra • Laban, Bojana • Veljović, Djordje • Stanković, Dalibor
Domestic high performance electrode material was prepared by thermolysis of in situ synthesized urea-formaldehyde (UF) resins modified with Fe(III) nitrate and Ti(IV) oxide in different combinations: iron salt and UF resins (SynFe/UF-TP), titan oxide and UF resins (SynTi/UF-TP) and both metal compounds together and UF resins (SynFe+Ti/UF-TP). For comparison, the thermolysis prepared materials produced by simple physical mixture of metal compounds and UF resins (Fe/UF-TP, Ti/UF-TP and Fe+Ti/UF-TP ...
10th Jubilee International conference on radiation in various fields of research, Spring edition (RAD 2022)
• 13 Jun 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Kostić, Marija • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena
The effect of γ–irradiation on hydrolytic stability of nano-silica, nano-titania, and wood flour (WF) modified urea-formaldehyde (UF) resins was investigated. Modified UF resin with wood flour (Pinus silvestris L.) as natural filler and modified UF resin with a mixture of SiO2/WF and TiO2/WF fillers were synthesized. A total of five samples were synthesized, with the designations UF/SiO2, UF/TiO2, UF/WF, UF/SiO2/WF, and UF/TiO2/WF, under the same conditions. The content of free formaldehyde (FA) ...
XI International conference of social and technological development- STED 2022, Trebinje, Republic of Srpska, B&H
(University PIM, Banja Luka, Republic of Srpska, B&H)
• 02 Jun 2022
Kostić, Marija • Samaržija-Jovanović, Suzana • Cakić, Suzana • Ristić, Ivan
Polymers are the subject of intensive research and development, not only in science but also in industry. In the last few years, many studies have been conducted on conjugated polymers, and this study of polymers has revealed their morphological characteristics and their unique electrochemical properties, which has attracted many researchers from different fields to use their versatility as a tool for technological progress. The intensive field of research is covered by the synthesis, characteri ...
1th International Conference „Conference on advances in science and technology“ COAST 2022
(Faculty of Management Herceg Novi)
• 26 May 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Kostić, Marija • Jovanović, Tijana • Marinović-Cincović, Milena
In this paper, the methods of activation of montmorillonite (MMT) K10 with the content of formaldehyde (FA) in urea-formaldehyde (UF) composites are compared. MMT K10 samples were activated in two ways: thermally(physical activation) and with sulfuric acid (chemical activation). In situ synthesis of UF composites with unmodified and activated K10 under the same conditions was performed. A total of three UF composites were synthesized: reference UF composite containing unmodified MMT UF/K10, UF c ...
Ninth international conference on radiation in various fields of research (RAD 2021)
(RAD Centre, Niš, Serbia)
• 14 Jun 2021
Marković, Gordana • Marinović-Cincović, Milena • Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Teofilović, Vesna • Marković, Marija • Pavličević, Jelena • Budinski-Simendić, Jaroslava
Effect of waste rubber particles (WTR) size on elastomers based on natural rubber and chlorosulfonated polyethylene rubber (NR/CSM= 50:50) was studied. Two types of WTR with different particle size (150–250 μm and 450–600μm) were used. The content of carbon black was constant but the content of WTR was varied from 0 to 40 phr. The compounds were prepared by two-roll mill. The crosslinked materials were obtained in hydraulic press. The irradiation of prepared composite materials was carried out u ...
Ninth international conference on radiation in various fields of research (RAD 2021)
(RAD Centre)
• 14 Jun 2021
Jovanović, Vojislav • Samaržija-Jovanović, Suzana • Petković, Branka • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena • Teofilović, Vesna
The montmorillonite as a 2:1 smectite type clay has two tetrahedral sheets of silica sandwiching the alumina octahedral sheet. The particles of this mineral are plate-shaped with the thickness of 0.96 nm and an average diameter about 1 μm. This type of clay (K10) is using to improve the characteristics of different materials in the fields of catalysis, food additives, polymers, sorbents, etc. In this study thermally activated montmorillonite (DK10) was used because the thermal treatment alters i ...
1st International conference on Advanced Production and Procesing-ICAPP 2019
(University of Novi Sad, Faculty of Technology Novi Sad)
• 10 Oct 2019
Čanaćević, Milena • Kostić, Marija • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Marković, Gordana • Budinski-Simendić, Jaroslava
In this work the hydrolytic stability of nano-composites based on urea-formaldehyde resin (UF) and montmorillonite (K10) as formaldehyde scavenger was investigated. K10 was activated by sulfuric acid (H2SO4) with and without mechanical mixing. The degree activation was determined using specific surface measurement (Sir's method) and the cation-exchange capacity (CEC) measurement. The hydrolytic stability of modified UF composites was determined by the mass losses estimation and via free formalde ...
Seventh international conference on radiation in various fields of research (RAD 2019)
(RAD Centre, Niš, Serbia)
• 10 Jun 2019
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Slaviša, Jovanović • Marković, Gordana • Marinović-Cincović, Milena • Budinski-Simendić, Jaroslava
The hydrolytic stability of organic-inorganic nano-composites prepared by a two-stage
polymerization of urea-formaldehyde resin (UF) filled with thermally activated montmorillonite (MMT) has been assessed before and after UV irradiation. The physical modification of MMT powder (type K10 with surface area 220 – 270 m2/g) was carried out by thermal treatment. The activated samples were designated as TA-K10 and the inactivated as NA-K10. The two types of ureaformaldehyde–MMT composites (UF/TA-K10 ...
Twenty‐first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019
(Materials Research Society of Serbia)
• 02 Sep 2019
Samaržija-Jovanović, Suzana • Petković, Branka • Jovanović, Tijana • Jovanović, Vojislav • Marković, Gordana • Marinović-Cincović, Milena • Budinski-Simendić, Jaroslava
Urea–formaldehyde (UF) resin adhesive is a polymeric condensation product of formaldehyde with urea and is considered as one of the most important wood adhesives. In spite of some advantages such as lower cost, fast curing, good performance in the panel, water solubility and being colorless, UF resin adhesives also possess a critical disadvantage: formaldehyde (FA) emission from the panels. Exposure to FA may occur by breathing contaminated indoor air, tobacco smoke, or ambient urban air. Furthe ...
Sixth international conference on radiation in various fields of research (RAD 2018)
(RAD Association)
• 18 Jun 2018
Budinski-Simendić, Jaroslava • Marinović-Cincović, Milena • Kojić, Dejan • Marković, Gordana • Pavličević, Jelena • Aroguz, Ayse • Samaržija-Jovanović, Suzana
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. Chlorination reduces the coefficient of surface friction and handling characteristics. Residual free sulfur bloom during long-term storage of elastomeric products can also be diminished. Chlorinated natural rubber (CNR) as network precursor for elastomeric materials finds applic ...
XII Conference of Chemists, Technologists and Environmentalists of Republic of Srpska
(University of Banja Luka, Faculty of Technology, Banja Luka)
• 02 Nov 2018
Jovanović, Slaviša • Jovanović, Vojislav • Marković, Gordana • Marinović-Cincović, Milena • Gligorić, Miladin • Vukić, Nevena • Samaržija-Jovanović, Suzana • Budinski-Simendić, Jaroslava
The effects of pyrogeneous silica on the mechanical properties of elastomeric
materials based on natural rubber (NR), polybutadiene rubber (PB) and styrene butadiene
rubber (SBR) are reported. For sample preparations the content of
network precursor was constant (25:25:50), but the content of filler was varied (0,
40, 60, 80, 100 phr). Curing behavior was assessed using oscillating disc
rheometer. Results indicated that the minimum torque and maximum torque
increase with increasing filler ...
1th International Conference „Conference on advances in science and technology“ COAST 2022
(Faculty of Management Herceg Novi)
• 26 May 2022
Ristić, Mirjana • Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Kostić, Marija • Jovanović, Tijana • Marinović-Cincović, Milena
U ovom radu je izvršeno poređenje načina aktiviranja montmorilonita (MMT) K10 sa sadržajem formaldehida (FA) u urea-formaldehidnim (UF) kompozitima. Uzorci MMT-a K10 su aktivirani na dva načina: termički i pomoću sumporne kiseline. Nakon aktiviranja MMT-a izvršena je in situ sinteza UF kompozita pod istim uslovima. Sintetisano je ukupno tri UF kompozita i to: referentni UF kompozit koji sadrži nemodifikovan MMT (UF/K10), UF kompozit koji sadrži termički aktiviran MMT (UF/K10) i UF kompozit koji ...
The First International conference on Sustainable Environment and Technologies „Creating sustainable commUNiTy“
(University "Union Nikola Tesla", Belgrad, Serbia)
• 24 Sep 2021
Petković, Branka • Kostić, Marija • Samaržija-Jovanović, Suzana • Laban, Bojana • Veljović, Djordje • Stanković, Dalibor
In this work, we present domestic high performance electrode material
prepared by thermolysis of in situ synthesized urea-formaldehyde (UF)
resins modified with Fe(III) nitrate. For comparison, material produced by
thermolysis of physical mixture of synthesized UF resins and Fe(lll) salt was
also prepared, and produced materials were electrochemically characterized by
cyclic voltammetry. The obtained results have shown that in situ synthesized
Fe modified UF material (SynFe/UF-TP) prepared ...
The First International Conference on Sustainable Environment and Technologies „Creating sustainable commUNiTy“
• 24 Sep 2021
Samaržija-Jovanović, Suzana • Jovanović, Vojislav • Petković, Branka • Kostić, Marija • Jovanović, Tijana • Marković, Gordana • Marinović-Cincović, Milena
In this work, the hydrolytic stability of composites based on the urea-formaldehyde resin (UF) and montmorillonite-MMT (K1 0 and KSF) as a formaldehyde (FA) scavenger was investigated. K10 and KSF were activated by sodium chloride (NaCl) for the purpose of modified Na-MMT. The degree of activation was determined using specific surface measurement by Sir's method. Evaluation of MMT activation was performed by determining free and liberated FA after acid hydrolysis of synthesized crosslinked UF/MM ...
27th International Conference Ecological Truth & Environmental Research
(University of Belgrade, Technical Faculty in Bor)
• 18 Jun 2019
Budinski-Simendić, Jaroslava • Kojić, Dejan • Marković, Gordana • Jovanović, Slaviša • Erceg, Tamara • Vukić, Nevena • Tanasić, Ljiljana • Samaržija-Jovanović, Suzana
Elastomeric materials have viscoelastic properties and can be designed for numerous applications, tires production, vibration isolation and damping. These properties can be tailored for a wide temperature range and in ozone-rich atmospheres. Processing capacity of a rubber compound can be predicted by their vulcanization properties. In goals of raising environmental demands rubber manufacturers are now focusing on the uses of recycled product. Re-use, recycle, pyrolysis and recovery are the comm ...
XVlIl Scientific-Expert Conference on Railways- RAILCON
(Faculty of Mechanical Engineering Nis)
• 11 Oct 2018
Marković, Gordana • Jovanović, Vojislav • Marinović-Cincović, Milena • Samaržija-Jovanović, Suzana
Wood flour composites can be optimized to obtain new materials for a part of the railroad infrastructure. Curing, mechanical and morphological characteristics of carbon blackand silica-filled natural ntbber (NR)/chlorosulphonated (CSM)/wood flour rubber blends were studied. Results indicate that the minimum torque and max:imum torque increase with increasing filler loading in the compounds, whereas scorch time shows a decreasing trend. The cure time of carbon black--filled NRICSM/wood .flour rub ...
XII Conference of Chemists, Technologists and Environmentalists of Republic of Srpska
(University in Banjaluka, Faculty of Technology)
• 02 Nov 2018
Jovanović, Slaviša • Jovanović, Vojislav • Marković, Gordana • Marinović-Cincović, Milena • Vukić, Nevena • Samaržija-Jovanović, Suzana • Budinski-Simendić, Jaroslava
The effects of pyrogeneous silica on the mechanical properties of elastomeric materials based on natural rubber (NR), polybutadiene rubber (PB) and styrene-butadiene rubber (SBR) are reported. For sample preparations the content of network precursor was constant (25:25:50), but the content of filler was varied (0, 40, 60, 80, 100 phr). Curing behavior was assessed using oscillating disc rheometer. Results indicated that the minimum torque and maximum torque increase with increasing filler loadin ...
Proceedings of the CODEMA 2020
(Union of Mathematicians of Macedonia - ARMAGANKA)
• 31 Oct 2020
Kontrec, Nataša • Panić, Biljana • Tošić, Marina • Vujošević, Mirko
This paper presents an approach for solving the maximum reliability k-center location problem. We are modifying the well-known p-center problem in order to determine the location of the observed objects and maximize the reliability of supply system coverage. The problem is defined as a stochastic problem of multi-center location on a graph. As a solution, two new algorithms have been proposed. The first is modified Dijkstra’s algorithm for determination of the most reliable paths between nodes i ...
Lokalna samouprava u planiranju i uređenju prostora i naselja: Geneze i perspektive prostornog razvoja
(Asocijacija prostornih planera Srbije, Univerzitet u Beogradu – Geografski fakultet)
• 10 Apr 2018
Ristić, Dušan • Ivanović, Marko • Marjanović, Marjan • Milošević, Dušan • Miličević, Mario
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, zasnovanoj na principima slobodnog tržišta. Promene političkog sistema i društvenog uređenja inicirale su promenu sistema planiranja. Društveni kontekst diktira prilagođavanje procesa planiranja i planskih dokumenata aktuelnom trenutku i učestalim društvenim promenama. Pomen ...
Lokalna samouprava u planiranju i uređenju prostora i naselja: prostorne integracije
(Asocijacija prostornih planera Srbije, Univerzitet u Beogradu- Geografski fakultet)
• 10 Nov 2020
Vagić, Nemanja • Ristić, Dušan
Na prostorima neposredno uz reke, zbog hidroloških, ekoloških i bezbednosnih razloga, kao i zakonskih odredbi, načela i principa planiranja, najčešće nije dozvoljena gradnja. Planska dokumenta ove prostore uglavnom definišu kao vodno, šumsko zemljište ili zelene površine. Međutim, rečne obale su zbog estetskih, pejzažnih i ambijentalnih vrednosti veoma atraktivni prostori za izgradnju. Stoga su izložene velikom pritisku i često su primeri neadekvatne, neplanske, bespravne gradnje i uzurpacije ja ...
XI Naučno-stručni skup sa međunarodnim učešćem “Planska i normativna zaštita prostora i životne sredine”, Zbornik radova
(Asocijacija prostornih planera Srbije, Univerzitet u Beogradu – Geografski fakultet, Beograd.)
• 27 Oct 2021
Milentijević, Nikola • Ostojić, Miloš • Božović, Sanja • Stevanović, Vladica • Cimbaljević, Marija • Pantelić, Milana
Specijalni rezervat prirode (SRP) „Gornje Podunavlje“ je lociran u severozapadnoj Bačkoj, uz panonski sektor toka Dunava. U radu su predstavljene promene na osnovu CORINE Land Cover (CLC) baze podataka (1990-2018) za definisano područje istraživanja: a) promene vegetacionog pokrivača, b) prostorna distribucija promena i c) promene u načinu korišćenja zemljišta. Generalno, najintenzivnije promene su detektovane tokom devedesetih godina XX veka. U kvantitativnom i geoprostornom smislu, promene sa ...
The 5th Serbian Congress of Geographers „Innovative approach and perspectives of the applied geography“, Abstract Book
(University of Novi Sad, Faculty of Sciences, Department of Geography, Tourism and Hotel Management, Novi Sad)
• 29 Sep 2021
Milentijević, Nikola • Bačević, Nikola • Valjarević, Aleksandar • Radaković, Milica • Pantelić, Milana
Recent climate change causes significant natural and socio-economic consequences. Global climate changes are caused by natural processes and anthropogenic factor. They represent one of the major environmental problems of the late XX and early XXI century. Changes in temperature and precipitation play a significant role of understanding climate change issues. It includes numerous extreme climatic events such as heat waves, droughts, forest fires etc. Empirical studies show an increase in the aver ...
Kongres mladih matematičara Novi Sad 2022
• 01 Apr 2024
Maksimović, Miroslav
In this talk, we will discuss the generalized Riemannian manifold and introduce a quarter-symmetric connection that preserves the generalized Riemannian metric. We will also observe a quarter-symmetric connection with a special condition and recurrent torsion tensor and examine the properties of linearly independent curvature tensors of generalized Riemannian manifold.
7th International Conference CONTEMPORARY PROBLEMS OF MATHEMATICS, MECHANICS AND INFORMATICS, Book of Abstracts
(State University of Novi Pazar)
• 01 Apr 2024
Ljajko, Eugen • Najdanović, Marija • Maksimović, Miroslav • Kontrec, Nataša
In geometry teaching, visualization is an indispensable method of work. Its importance is emphasized in the study of abstract theories when the human mind is not capable enough to perceive the regularities determined by complex mathematical formulas without adequate images illustrating the problem. This is also the case with the theory of infinitesimal bending, that has recently been explored and represented with the use of computers. Use of computers, as an indispensable didactic tool for moder ...
Konferencija ITOP18
(FTN Čačak)
• 01 Apr 2024
Maksimović, Miroslav • Kontrec, Nataša • Panić, Stefan • Petrović, Milena
Istraživanja su pokazala da uprkos brojnim prednostima primene savremenih tehnologija u nastavi matematike sam proces uvođenja istih u učionice je spor i dosta složen. Upravo iz tih razloga, ovaj rad istražuje mogućnosti uvođenja matematičkog softvera u nastavni proces i kakav bi to imalo uticaj na nastavu ali i razumevanje prezentovanog sadržaja od strane studenata. Zapravo, ovaj rad ispituje efekte koje bi uvođenje programskog paketa Geogebra imalo na nastavu geometrije na odseku za matematik ...
PROCEEDINGS OF 12th INTERNATIONAL CONFERENCE SCIENCE AND HIGHER EDUCATION IN FUNCTION OF SUSTAINABLE DEVELOPMENT, Užice, Serbia
(Western Serbia Academy of Applied Studies, Užice (Serbia))
• 08 Oct 2021
Maksimović, Miroslav • Kontrec, Nataša • Panić, Stefan
With the development of information technologies and educational software, there was a need for research and examination of how and in what way to use them in teaching, without losing the quality of existing traditional methods. One of the goals in this process of finding the most suitable model for the use of educational software in teaching is to motivate students to use them independently. For that reason, this paper explores the possibilities and ways of introducing GeoGebra mathematical sof ...
