ПЛАТОН репозиторијум: Recent submissions

Now showing items 181-200 of 1190

    • Hydrolytic, thermal, and UV stability of urea-formaldehyde resin/thermally activated montmorillonite nanocomposites 

      Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Petković, Branka; Jovanović, Tijana; Marković, Gordana; Porobić, Slavica; Papan, Jelena; Marinović-Cincović, Milena (Wiley, 2020-09-16)
      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 materials based on rubber blend nanocomposites 

      Porobić, Slavica; Marković, Gordana; Ristić, Ivan; Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Budinski-Simendić, Jaroslava; Marinović-Cincović, Milena (Wiley, 2019-08-15)
      In this applicative work, two types of silica filler were used to increase the adhesion strength between steel and elastomeric hybrid materials based on chlorosulfonated polyethylene rubber (CSM) and polychloroprene rubber ...

    • Properties Of Elastomeric Composites Based On Three Network Precursors 

      Jovanović, Vojislav; Jovanović, Slaviša; Marković, Gordana; Samaržija-Jovanović, Suzana; Porobić, Slavica; Budinski-Simendić, Jaroslava; Marinović-Cincović, Milena (Wiley, 2019-04-10)
      The powder recycled rubber (PRR) can be used as a filler and a modifier for elastomeric materials and asphalt. Composites based on elastomers and recycled rubber powders are a serious challenge for the environment. The ...

    • Biocomposites Based On Cellulose And Starch Modified Urea-Formaldehyde Resin: Hydrolytic, Thermal And Radiation Stability 

      Jovanović, Vojislav; Samaržija-Jovanović, Suzana; Petković, Branka; Milićević, Zoran; Marković, Gordana; Marinović-Cincović, Milena (Wiley, 2019-04-10)
      Two biocomposites based on cellulose (UFC) and starch modified urea formaldehyde (UFS) resin (F/U ratio of 0.8) were synthesized using the same procedure. The hydrolitical, thermal, and radiation stability of biocomposites ...

    • Ternary NR/BR/SBR rubber blend nanocomposites 

      Jovanović, Slaviša; Samaržija-Jovanović, Suzana; Marković, Gordana; Jovanović, Vojislav; Adamović, Tijana; Marinović-Cincović, Milena (SAGE, 2018-02-24)
      The goal of this work was to synthesize and characterize ternary rubber blends based on polyisoprene (natural rubber (NR)), polybutadiene rubber (BR), and styrene–butadiene rubber (SBR) (NR/BR/SBR = 25/25/50) reinforced ...

    • Thermal behavior of gamma-irradiated urea-formaldehyde composites based on the differently activated montmorillonite K10 

      Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Jovanović, Tijana; Petković, Branka; Marković, Gordana; Porobić, Slavica; Marinović-Cincović, Milena (Springer, 2022-07-09)
      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 ...

    • Synthesis, characterization, hydrolytic, and thermal stability of urea–formaldehyde composites based on modified montmorillonite K10 

      Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Jovanović, Tijana; Petković, Branka; Marković, Gordana; Porobić, Slavica; Marinović-Cincović, Milena (Springer, 2022-02-11)
      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 ...

    • Radiation stability and thermal behaviour of modified UF resin using biorenewable raw material-furfuryl alcohol 

      Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Petković, Branka; Jovanović, Slaviša; Marković, Gordana; Porobić, Slavica; Marinović-Cincović, Milena (Elsevier, 2019-06-15)
      The thermal stability of organic-inorganic nano-composites prepared by a two-stage polymerization of urea-formaldehyde resin (UF) with furfuryl alcohol (FA) and TiO2 before and after irradiation has been researched. The ...

    • Gamma Irradiation: Properties, Behavior and Applications 

      Marković, Gordana; Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Budinski-Simendić, Jaroslava; Marinović-Cincović, Milena (Nova Science Publisher, 2021-08-11)
      Gamma radiations are used for sterilization processes in medical devices, food industry as well as in nuclear power plants or aerospace. Gamma irradiation is a very convenient tool for the modification of polymeric materials. ...

    • Crosslinking of Polymers: Rubber Vulcanization 

      Marković, Gordana; Marinović-Cincović, Milena; Samaržija-Jovanović, Suzana; Jovanović, Vojislav; Budinski-Simendić, Jaroslava (Springer Nature Switzerland AG, 2020-10-02)
      Crosslinking is a process whereby the polymer segments from different polymer chains are interconnected by covalent (and sometimes ionic) linkages. Crosslinks can be formed either during the polymer synthesis process, or ...

    • Radionuclides and Metals in the Parks of the City of Belgrade, Serbia: Spatial Distribution and Health Risk Assessment. 

      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 ...

    • An Improved Modification of Accelerated Double Direction and Double Step-Size Optimization Schemes 

      Petrović, Milena J.; Valjarević, Dragana; Ilić, Dejan; Valjarević, Aleksandar; Mladenović, Julija (MDPI, 2022-01-13)
      We propose an improved variant of the accelerated gradient optimization models for solving unconstrained minimization problems. Merging the positive features of either double direction, as well as double step size accelerated ...

    • Radon concentration in dwellings in the mining area of “Trepča” complex. 

      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 ...

    • Ash radioactivity level and ambient dose equivalent rate in the vicinity of the TPP „Kosovo B“ Obilić. 

      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 ...

    • Analiza visoke koncentracije radona u jednoj kući u rudarskom području kompleksa „Trepča“ 

      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 ...

    • Visoke koncentracije radona u porodičnoj kući u okolini Kosovske Mitrovice 

      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 ...

    • Procena zdravstvenog rizika izloženosti radonu iz vode u opštini Novo Brdo 

      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 ...

    • Фактори опредељења студената Учитељског факултета за активно бављење спортом 

      Миленовић, Живорад М. (Факултет за спорт и физичко васпитање у Лепосавићу, Универзитет у Приштини – Косовска Митровица, 2021)
      Аутор у раду проучава најчешће разлоге опредељења студената учитељског факултета за активно бављење спортом у спортским клубовима. У истраживању се пошло од опште претпоставке да се студенти учитељског факултета из различитих ...

    • Васпитно деловање у периоду Хитлерове националсоцијалистичке омладине 

      Миленовић, Живорад М.; Рајчевић, Петар Ђ. (Филозофски факултет Универзитета у Приштини са привременим седиштем у Косовској Митровици, 2021)
      Проблем проучавања овог рада је васпитно деловање у периоду Хитлерове националсоцијалистичке омладине у њена два огранка: Хитлер југенду и Савезу немачких девојака. Оба огранка су настала у периоду Вајмарске републике, али ...

    • Најчешћи реметилачки фактори наставе на даљину у млађим разредима основне школе у условима глобалне пандемије Ковид-19 

      Миленовић, Живорад; Ботић, Младен (Универзитет у Нишу, Филозофски факултет, Департман за педагогију, 2021)
      Проблем истраживања овог рада су најчешћи недостаци наставе на даљину у условима глобалне пандемије Ковид-19. У истраживању се пошло од опште претпоставке да је настава на даљину у млађим разредима основне школе у условима ...