Претрага

Упит dcterms_creator_txt:Vesna M. Pavelkić

1358 items

  • Determination of oxygen surface groups on biochars using Boehm-titration method

    Krstić D. Aleksandar, Lolić Đ. Aleksandar, Ilić Marija, Mijatović Aleksandar, Zlatanović J. Snežana, Nedić P. Zoran, Pavelkić M. Vesna (2015)

  • Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija

    Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić (2015)
    Biougalj se dobija pirolizom iz organskog otpada. Smatra se ,,modifikatorom'' zemljišta i koristi se kao đubrivo i kao rezervoar za skladištenje ugljenika. Kvantifikacija funkcionalih grupa je važna zbog hemijske reaktivnosti biougljeva koji imaju uticaj na svojstva zemljišta. U istraživanju su korišćena 3 uzorka biouglja različitog porekla i jedan referentni, aktivni ugalj. Sadržaj kiselih funkcionalnih grupa je određivan titracijom po Boehm-u na dva načina: uvođenje N2 tokom titracije i tretman sa BaCl2. Optimizovan je način pripreme tri Boehm ova rastvora ...
    ... površini biougljeva primenom Boehm-ovih titracija Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Određivanje sadržaja kiselih ...
    ... površini biougljeva primenom Boehm-ovih titracija | Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić | 52. savetovanja Srpskog hemijskog društva | 2015 | | http://dr.rgf.bg.ac.rs/s/repo/item/0005644 Дигитални репозиторијум ...
    ... povréini biougljeva primenom Boehm-ovih titracija Aleksandar D. Krstié, Aleksandar D. Lolié, Marija A. li, Aleksandar M. Mijatovi¢*, ‘Snezana J. Zlatanovi¢'*, Zoran P. Nedi¢***, Vesna M. Pavelki¢**** Hemijski fakultet, Univerzitet u Beogradu, Studentski trg 12-16, Beograd, Srbija; *Rudarsko-geoloski ...

  • Malathion-induced inhibition of human plasma cholinesterase studied by the fluorescence spectroscopy method

    V. M. Pavelkić, K. S. Krinulović, J. Z. Savić, M. A. Ilić (2008)
    The in vitro effect of technical grade malathion was assessed via the kinetic parameters of human plasma butyrylcholinesterase (BChE) using N-methylindoxyl acetate as a substrate for BChE. An inhibitor kinetics study demonstrated the existence of a biphasic inhibition curve, indicating high- and low-affinity binding sites of malathion. The IC50 values as calculated from the experimental inhibition curves were 1.33 × 10–9 and 1.48 × 10–5 M for the high- and low-affinity binding sites, respectively; Hill’s analysis gave 1.29 × ...
    Малатион, инхибиција, хумана плазма холинестераза, метода флуоресцентне спектроскопије

  • Characterization of biochar surface functional groups

    Marija Ilić, Vesna Pavelkić, Aleksandar Lolić, Branko Leković (2021)
    In this work, biochar originating from paper fibres was examined. Biochar was prepared via pyrolysis method at 550°C. Oxygen-containing functional groups on biochar surface were determined. The surface functional groups of biochar were analysed by Fourier transform infrared spectroscopy. The amount of oxygen-containing functional groups was performed with Boehm titration. The total acidity of biochar was mostly attributed to carboxylic and lactonic groups.
    biochar, surface functional groups, spectroscopy

  • Prevencija toksikacije lanca ljudske ishrane polihlorovanim bifenilima (PCB) primenom hemijskih postupaka degradacije

    Dragan Manojlović, Olgica Cvetković, Ilić Marija, Vesna Pavelkić, Tomislav Jovanović, Miodrag Pavlović (2010)

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... porcine pepsin activityin vitro Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] The influence of Al3+ion on porcine pepsin activityin vitro | Vesna M. Pavelkić, Kristina R. Gopcević, Danijela ...
    ... Chemistry, December 2008; 23(6): 1002—-1010 informa healthcare • 3+ • • • •. B •. The influence of A' ion on porcine pepsin activity 2? TfO VESNA M. PAVELKIC!, KRISTINA R. GOPCEVIC?, DANIJELA Z. KRSTIC?, & MARIJA A. ILIC? lDepartmem of Physical Chemistry, Vinca-pInstitute of Nuclear Science ...
    ... activator concentration that gives a rate equal to half at a saturating concentration of activator, were found to be 8.82 + 0.90 „M, 8.39 + 0.76 „ M, and 8.05 + 0.48 „M respectively. Native PAGE electrophoresis shows the decrease in electrophoretic mobility of pepsin and confirms modification of the ...

  • Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija

    Krstić Aleksandar, Lolić Aleksandar, Ilić Marija, Mijatović Aleksandar, Zlatanović Snežana, Nedić Zoran, Pavelkić Vesna (2015)

  • Unusually sluggish microemulsion system with water, toluene and a technical branched alkyl polyethoxylate

    Marija Ilić, Franz-Hubert Haegel, Vesna Pavelkić, Snežana Zlatanović, Zoran Marković, Aleksandar Cvjetić (2015)
    Microemulsion systems with water, toluene and nonionic surfactants are interesting for application due to the excellent solvent properties of aromatic hydrocarbons. In this study, the pseudo-binary phase diagram (“fish-diagram”) of such a ternary system was investigated using a branched technical alkyl polyethoxylate. Lutensol ON 50 (i-C10E5) was considered a suitable surfactant. The system with technical branched i-C10E5 exhibits very long, and for compositions near optimum solubilization, i.e., the minimum content of surfactant needed for a bicontinuous microemulsion, extremely long ...
    микроемулзија, толуен, оксоалкохол етоксилат, термодинамичка стабилност, тернарни фазни дијаграми, дијаграми „fish“

  • Application of Peleg model on mass transfer kinetics during osmotic dehydratation of pear cubes in sucrose solution

    Vesna Pavelkić, Tanja Brdarić, Marija Petrović, Gavrilo Šekularac, Milica Košević, Lato Pezo, Marija Ilić (2015)
    The applicability of Peleg model was investigated for predicting mass transfer kinetics during the osmotic dehydration (OD) process of pears, at different concentrations (40, 60 and 70%, w/w) and temperatures (20, 35 and 50 °C) of sucrose solution. Increase in sucrose solution concentration resulted in higher water loss (WL) and solid gain (SG) values through the osmotic treatment period. After 360 min of osmotic treatment of pears, WL ranged from 23.71 to 31.68% at 20 °C, from 24.80 to ...
    осмотска дехидрација, крушкa, кинетика, температурни ефекат, Пелег модел

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми
    ... The Repository is available at: www.dr.rgf.bg.ac.rs Chemical Industry & Chemical Engineering Quarterly MARIJA ILIĆ! FRANZ-HUBERT HAEGEL? VESNA PAVELKIĆ? DRAGAN ZLATANOVIĆ“ SNEŽANA NIKOLIĆ-MANDIĆ* ALEKSANDAR LOLIĆ ZORAN NEDIĆE !Faculty of Mining and Geology, University of Belgrade, Belgrade ...
    ... FRANZ-HUBERT HAEGEL? VESNA PAVELKIĆŠ DRAGAN ZLATANOVIĆ“ SNEŽANA NIKOLIĆ-MANDIĆS ALEKSANDAR LOLIĆS ZORAN NEDIĆS [29] [30] [31] [32] W.C. Griffin, J. Soc. Cosmet. Chem. 1(5) (1949) 311-326 M. Kahlweit, R. Strey, Angew. Chem. Int. Ed. Engl. 24 (1985) 654-668 M. Kahlweit, R. Strey, ...
    ... alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic Дигитални репозиторијум Рударско-геолошког факултета Универзитета ...

  • Испитивање магнетске сусцептибилности прашине антропогеног порекла

    Дубравка Новичић, Весна Цветков, Весна Дамњановић (2019)
    ... антропогеног порекла Дубравка Новичић, Весна Цветков, Весна Дамњановић Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Испитивање магнетске сусцептибилности прашине антропогеног порекла | Дубравка Новичић, Весна Цветков, Весна Дамњановић | VII Меморијални научни ...
    ... sredine „Docent dr Milena Dalmacija“, 2019. ISPITIVANJE MAGNETSKE SUSCEPTIBILNOSTI PRAŠINE ANTROPOGENOG POREKLA Dubravka Novičić1, Vesna Cvetkov2, Vesna Damnjanović3 1,2,3Univerzitet u Beogradu, Rudarsko-geološki fakultet, Đušina 7, Beograd dubravka.novicic@rgf.bg.ac.rs Izvod ...
    ... n u primenjenom magnetskom polju H. Razlikujemo tri vrste : masenu m, zapreminsku V i molarnu mol, koje su definisane sledećim jednačinama, respektivno: V m mol m mol M V H          , (1) gde je M – magnetizacija,  - gustina a Vmol – molarna zapremina. Uprkos široko ...

  • Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке

    Весна Цветков, Илија Васиљевић, Бранислав Сретеновић, Весна Дамњановић (2018)
    ... податке Весна Цветков, Илија Васиљевић, Бранислав Сретеновић, Весна Дамњановић Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке | Весна Цветков ...
    ... RHEOLOŠKIH OBJEKATA NA LOKALITETU KREMENITE NJIVE PRIMENOM  OJLEROVE 3D DEKONVOLUCIJE NA MAGNETOMETRIJSKE PODATKE    Vesna Cvetkov1, Ilija Vasiljević2, Branislav Sretenović1, Vesna Damnjanović1    1) Univerzitet u Beogradu, Rudarsko‐geološki fakultet, e‐mail: vesna.cvetkov@rgf.bg.ac.rs  2) NAFTAG ...
    ... DEFINITION OF ARCHAEOLOGICAL OBJECTS ON THE LOCATION KREMENITE NJIVE  USING EULER 3D DECONVOLUTION ON MAGNETIC DATA    Vesna Cvetkov1, Ilija Vasiljević2, Branislav Sretenović1  ,   Vesna Damnjanović1    1) University of Beograde, Faculty of Mining and Geology, e‐mail: vesna.cvetkov@rgf.bg.ac.rs  2)  ...

  • Clockwise vertical-axis rotation in the West Vardar zone of Serbia: Tectonic implications

    Vesna Lesić, Emo Márton, Violeta Gajić, Dragana Jovanović, Vesna Cvetkov (2018)
    The Vardar-Tethyan mega-suture between the Eurasian and Adria (Gondwana) margins comprises remnants of oceanic lithosphere of Neotethys and distal parts of the adjacent continental margins including unconformable Late Cretaceous sedimentary cover and Cenozoic igneous rocks of post-obduction age. This study provides kinematic constraints for displacements and rotations affecting the Serbian part of the West Vardar and Jadar-Kopaonik units after the closure of the Neotethyan (= Sava) Ocean. The targets of the paleomagnetic research were Late Cretaceous sediments representing an ...
    Paleomagnetism, Clockwise rotation, Dinarides, West Vardar zone
    ... Tectonic implications Vesna Lesić, Emo Márton, Violeta Gajić, Dragana Jovanović, Vesna Cvetkov Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Clockwise vertical-axis rotation in the West Vardar zone of Serbia: Tectonic implications | Vesna Lesić, Emo Márton, ...
    ... Urošević, M., Pavlović, Z., Klisić, M., Brković, T., Malšević, M., Stefanović, M., et al. (1973a). Geological map and Explanatory Notes of the Basic Geological Map of SFRJ, sheet Vrnjci (1:100 000) (p. 69). Beograd: Savezni Geološki Zavod. Urošević, M., Pavlović, Z., Klisić, M., Karamata ...
    ... www.dr.rgf.bg.ac.rs Clockwise vertical-axis rotation in the West Vardar zone of Serbia: tectonic implications Vesna Lesić1 • Em}o Márton2 • Violeta Gajić3 • Dragana Jovanović1 • Vesna Cvetkov4 Received: 28 May 2018 / Accepted: 23 September 2018 / Published online: 24 October 2018 � Swiss Geological ...

  • Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia

    Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović (2018)
    ... Zone of Serbia Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia | Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana ...
    ... Book, 29-30% November2018,Bratislava, Slovakia Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zoneof Serbia VESNA LESIĆ!, EMO MARTON?, VESNA CVETKOV" and DRAGANA JOVANOVIĆ! 1 – Republic Geodetic Authority, Department ofGeomagnetism and4erohomy, Bulevar vojvode Mišića 39, 11000 ...
    ... Огедаћома Mgr. Peter Kiss Mgr. Samuel Rybar, PhD. Mgr. Leonard Zahradnik e ComeniusUniversity in Bratislava ISBN: 978-80-223-4614-6 Зијап, M., Csibri, T., Kiss, P. and Rybar, S. (Eds.): Environmental, Structural and Stratigraphical Evolution of the Western Carpathians: 11'h ESSEWECAConference ...

  • Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta

    Vesna Cvetkov (2020)
    ... kod prospekcije arheoloških lokaliteta Vesna Cvetkov Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta | Vesna Cvetkov | Aktuelna interdisciplinarana ...
    ... Мужијевић, Р., Старчевић, М., Стојановић, Р. 1992. Примена геофизике у археологији. Археологија и природне науке (ур. Д. Срејовић), Београд: 115-123. Maher, B. A., Taylor, R. M. 1988. For- mation of ultrafine-grained magnetite in soils. Nature 336: 368-371. Mikić, M., Stojanović, V., Mrđić, N ...
    ... available at: www.dr.rgf.bg.ac.rs 14 ZNAČAJ GEOGRAFSKE ŠIRINE ZA LOCIRANJE UZROČNIKA MAGNETNIH ANOMALIJA KOD PROSPEKCIJE ARHEOLOŠKIH LOKALITETA Vesna Cvetkov Rudarsko-geološki fakultet, Univerzitet u Beogradu Klјučne reči: magnetometrija, asimetrija magnetnih anomalija, inklinacija, redukcija na ...

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... Mesozoic carbonate rocks in Serbia used as dimension stone Vesna Matović, Tijana Vojnović Ćalić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Mesozoic carbonate rocks in Serbia used as dimension stone | Vesna Matović, Tijana Vojnović Ćalić | Bulletin of Engineering ...
    ... the low-mountainous terrain of the Maljen (400 m) and Suvobor (500 m) mountains. The Struganik quarry is irregular in shape, elongated in a NW-SE direction, and occupies an area of 0.32 km”. The maximum ore thickness is estimated to be 76 m (Kijanović 2007). The Upper Cre- taceous (Turon ...
    ... slightly and is in range of 2,650–2,690 kg/ m* (Fig. 4a). The values of real density (2,700–2,712 kg/ m?) are in accordance with the mineral composition of these almost pure limestones (the main mineral is calcite with a density value of 2,710 kg/m?*; Fig. 4a). The constant real density values ...

  • Numerical modelling of a single intra-oceanic subduction for the origin of the Balkan ophiolites

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2024)

  • Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data

    Vesna Cvetkov, Ilija Vasiljević, Mirko Petković (2015)

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • Numerical modelling of the roughly simultaneous emplacement of two distinct ophiolite belts

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2024)