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1991 items

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • Back-arc underplating provided crustal accretion affecting topography and sedimentation in the Adria microplate

    Paolo Mancinelli, Vittorio Scisciani, Cristina Pauselli, Gérard M. Stampfli, Fabio Speranza, Ivana Vasiljević (2021)
    Supported by evidence of deep crustal sources for the observed magnetic anomalies in Central Italy and by outcropping gabbros in the Croatian archipelago, we model the observed gravity and magnetic anomalies in the Central Adriatic Sea and surroundings. We suggest that the major magnetic anomalies in the area are related to a wide underplating and propose that this volume represents the first stage of the back-arc Adria continental breakup in Early Permian times. During the Palaeotethys-Adria collision, underplating has ...
    Underplating, akrecija kore, Magnetske anomalije, Jadranska ploča

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... room temperature for the sintered samples are listed in Table 2. Microstructure (grain size) and phase composition, as well as their interplay guuide the magnetization process and influence magnetic properties in general [69]. With an increase in sintering temperature up to 1300 "C, different phase ...
    ... functional properties, the XRPD, as well as SEM was performed and the results were evaluated in detail. Generally, the spinel and perovskite phases were dominant for as-prepared materials, while spinel, perovskite, and barioferrite-like phases in different ratios prevailed in the case of sintered samples ...
    ... composition [28,29]. Barium titanate (BaTiOx) is a well-known compound used to develop magnetoelectric muhltiferroic materials. This is due to its unique dielectric properties in the tetragonal phase with the P4mm space group [30-—33]. In order to design novel multiferroic composites based on ...

  • Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases

    Nikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić (2021)
    Ispitivani su uticaji primene mono- i dvokomponentnih organskih modifikatora na određivanje lipofilnosti 12 tetradentatnih Šifovih baza metodom reverzno-fazne tankoslojne hromatografije. Osnovni cilj je da se proceni tip interakcije između posmatranih jedinjenja i komponenti primenjenih hromatografskih sistema i uspostavi neki obrazac ponašanja kako bi se lakše izabrala kombinacija organskih modifikatora koji će simulirati interakciju u biološkim sistemima na osnovu činjenica da iste osnovne intermolekularne interakcije su odgovorne za ponašanje supstanci i u biološkom i u hromatografskom sistemu. Primenjeni organski modifikator ...
    Šifove baze, Lipofilnost, RP-TLC, Organski modifikatori

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs J. Serb. Chem. Soc. 79 (5) 597–612 (2014) UDC 547.99:627.8.034.7:665: JSCS–4611 628.5(282.243.742) Original scientific paper 597 The use of biological markers in the det ...
    ... 17α(H)21β(H) and 22(S) configurations, as well as by the presence of typical geo-isomers, 18α(H)- -neohopanes (Fig. 3). These compounds have never been reported in biosphere and recent singenetic organic matter. The presence of singenetic immature orga- nic matter in the sediments was confirmed by the i ...
    ... 20(S)-configurations, as well as the typical geo-isomers, 13β(H)17α(H)- and 13α(H)17β(H)-diasteranes, were present (Fig. 4). The values of the sterane matu- rity ratios are in a range typical for crude oils (Table VI).1 The slightly lower values of these parameters than in crude oils could be attributed ...

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... period. Figure 7. Registered individual well discharges, January 1 to December 31, 2009 The individual well discharges in the model of Šumice were specified in accordance with both the recorded operating hours and discharge rates. The well screens were Journal of Sustainable Development ...
    ... combining forward-in time and backward-in time transport modeling, it is possible to determine the impact of potential contaminant sources at unknown locations within a well capture zone, including the expected times of arrival of a contaminant, the dispersion-related reduction in concentration, the ...
    ... model based on voluminous borehole data collected in the extended area. Figure 4 shows the three-dimensional hydrogeological model of the sectional view of Šumice. The tapped water-bearing horizon is shown in blue, with production well screens shown in green. As previously mentioned, the overlying ...

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs COAL HOMOGENIZATION STOCKYARD SIZING, “TAMNAVA ...
    ... basis, especially the number of layers and length of the pile. The quality of lignite extracted in Serbia is characterized by large variations in moisture and ash content, resulting in variations in lower heating value. The sulphur content is low, as is iron content, while mercury is monitored ...
    ... can be stacked in 16 to 90 layers. For a more realistic hourly capacity, the minimum and maximum number of layers changes. For a pit rate of 3000 t/h, coal can be stacked in 25 to 150 layers. The example in Figure 2 shows the problem when the pit operates at a lower capacity, and in a zone containing ...

  • The interaction of organoselenium trans-palladium(II) complexes toward small-biomolecules and CT-DNA

    Vera M. Divac, Aleksandar Mijatović, Marina D. Kostić, Jovana Bogojeski (2017)
    Serija organoselenijum trans-paladijum(II) kompleksa 1 (bis(2-(fenilselanilmetil)oksolan)dihloropaladijum(II)), 2 (bis(2-(fenilselanilmetil)oksan)dihloropaladijum(II)) i 3 (bis(2) ,2-dimetil-3-(fenilselanil)oksan)dihloropaladijum(II)) su korišćeni za ispitivanje reaktivnosti ovog specifičnog tipa kompleksa prema različitim bio-molekulima. Ovaj sistem je od posebnog interesa jer se jako malo zna o supstitucionim reakcijam organoselenijum paladijum(II) kompleksa sa trans konfiguracijom. Zamena koordinovanog hlorida sa serijom malih bio-molekula (l-Met, l-His, l-Cis, GSH i 5′-GMP) proučavana je pod uslovima pseudo-prvog reda kao funkcija koncentracije nukleofila i temperature korišćenjem tehnika zaustavljenog toka. Rezultati za proučavane komplekse ukazuju da ...
    Pd(II), Selen, Substitucija, Kinetika, Mehanizam

  • Reconstruction of the Tethys’ Waning in the Balkans

    Dejan Prelević, Kristijan Sokol, Ana Mladenović, Violeta Gajić, Vladica Cvetković (2024)

  • Chemo-probe into the mantle origin of the NW Anatolia Eocene to Miocene volcanic rocks: Implications for the role of, crustal accretion, subduction, slab roll-back and slab break-off processes in genesis of post-collisional magmatism

    E. Yalçın Ersoy, Martin R. Palmer, Ş. Can Genç, Dejan Prelević, Cüneyt Akal, İbrahim Uysal (2017)
    Post-collisional Cenozoic magmatic activity in NW Anatolia produced widespread volcanism across the region. In the Biga Peninsula, in the west, medium-K calc-alkaline to ultra-K rocks with orogenic geochemical signature were emplaced at ~43–15 Ma (Biga orogenic volcanic rocks; BOVR). Volcanic activity in the Central Sakarya region, to the east, is mainly restricted to ~53–38Ma, but also continued during the Early Miocene with small basaltic extrusives (Sakarya orogenic volcanic rocks; SOVR). This study presents a new set of geochemical data ...

  • Strategic Environmental Assessment and the precautionary principle in the spatial planning of wind farms – European experience in Serbia

    Boško Josimović, Aleksandar Cvjetić, Danilo Furundžić (2021)
    Spatial determination planning is at an initial and very sensitive step in the development of wind farms. On one hand, it is important to maximize the potential of wind in a particular area, and on the other hand, it is important to achieve environmental protection (including the human population and natural heritage) in the same space at the same time. With this in mind, it is important to balance all the requirements that are relevant for reaching the optimal ...
    Obnovljiva energija, Održivost, Životna sredina

  • GIS Application Improvement with Multilingual Lexical and Terminological Resources

    Ranka Stanković, Ivan Obradović, Olivera Kitanović (2010)
    ... for each entry, synonyms and bibliographical references, as well as equivalent terms and definition in other languages. GeolISSTerm supports semantic and multilingual expansions of the query, as well as multilingual map annotation. In the initial phase around 3,500 Serbian concepts were entered ...
    ... http://www-igm.univ-mlv.fr/~unitex/ Case="1" Anim="=$a" Gen="=$g" Num="s" /> In addition to morphological dictionaries, wordnets in XML format are also used for expanding queries with related words as well as for bilingual searches. The Serbian wordnet (SWN), conceived within the Balkanet ...
    ... l'activité volcanique explosive direct, OrigID=2356, Lng=FR) Figure 2: GeolISSTerm HH tree in GeolISSTerm Further development is underway, as well as concept restructuring and synchronization in compliance with the ISO 1087-1 TMF standard (ISO, 2000). As to the physical (internal) imp ...

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... Serbia, as well as 276581 end customers (269380 in regulated supply and 1515 in free market) [71]. The wholesale natural gas market, except for the purchase of gas for the needs of public suppliers, is based on bilateral contracts between suppliers and between producers and suppliers. In 2018, in the wholesale ...
    ... higher consumption of natural gas, mainly because of combined heat and power production gas usage in industrial plants as well as in new gas plants with a combined cycle. Gas plants should be very important in the future, covering daily and seasonal unavailability of plants producing electricity from in ...
    ... mitigating climate change and providing equal access to energy [9]. In general, energy security is inextricably linked to the national security of a country and as such can be considered in the context of comprehensive security, as well as an independent integral part of a more general term [10]. Energy ...

  • Numerical modeling of Selanac debris flow propagation using SPH code

    Jelka Krušić, Biljana Abolmasov, Miloš Marjanović, Manuel Pastor, Saeid M. Tayyebi (2021)
    The Selanac debris flow is a very huge event triggered after extreme rainfall caused by Cyclone Tamara activity in the Republic of Serbia in May 2014. The Selanac case study was already modelling in different programs using Voellmy rheology assumptions like RAMMS software. In this paper research are focusing particularly on the process of debris flowing from initiation zone to main deposition area using Geoflow SPH two-phase model considering frictional rheology law. Main rheological parameters are back-calculated using also ...
    debris flow, modelling, SPH code, DEM
    ... heterogeneous in lithological SCG-XIII INTERNATIONAL SYMPOSIUM ON LANDSLIDES. CARTAGENA, COLOMBIA- JUNE 15th-19th-2020 composition, as well as grain size distribution (from fines to up to m 3 boulders in volume). The total length of the flow is 1.5 km and width is about 350 m in the widest part ...
    ... comparing to the depths in deposition zone, but actual run-out distance of debris flow was longer than the measured run-out distance obtained by the SPH simulation model. Also, simulation results show heights and volume change as well as depths of eroded material, which are in accordance with previous ...
    ... dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND ...

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... cnergy sources into usable forms in refineries and power plants, transmission and distribution of fucls, and the use of fuels in stationary and mobile applications. These activities result in emissions of carbon dioxide (CO») from the combustion of fossil fuels, as well as from non-combustion sources ...
    ... available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs e> energija, ekonomija, ekologija, 2023, god. XXV, br. 1 doi: 10.46793/EEE23-1.51M 51 Originalni naučni rad UDK 628.539:504.3.054 Integrative GHG Assessment in Oil and Gas ...
    ... activities focused on reducing ncgativc anthropogenic effects. With thc Paris Agreement in 2015, signatory countries achicved international consensus to limit increases in the global average temperature to well below 2%C compared to pre-industrial levels, and to make efforts to limit the temperature ...

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...
    mine planning, variability of coal quality, simulation, coal blending

  • Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2

    Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)
    Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...
    Metals and Alloys, Biochemistry, Biomaterials, Biophysics, Chemistry (miscellaneous)
    ... 0088h Pancreatic phospholipase A2 (PLA2) plays an important role in cellular homeostasis as well as in the process of carcinogenesis. Effects of metallo-drugs used as chemotherapeutics on the activity of this enzyme are unknown. In this work, the interaction between porcine pancreatic PLA2 and two ...
    ... from hen’s egg yolk incubated with porcine pancreatic PLA2 for different times (1, 2, 5, 15 and 30 min) as well as unperturbated phospholipid spectra are presented in Fig. 1. Peaks of interest in this study have values m/z = 760.6 and m/z = 782.6 for the proton and sodium adduct of PC 16 : 0; 18 : ...
    ... dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 1056 Metallomics, 2011, 3, 1056–1063 This journal ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... advances in involving hazard component into the analysis, complete solutions from inventory to risk, as well as early-warning systems development as a final stage and purpose of LSA (Dai et al., 2002). We have addressed several of these state-of-the-art aspects in our recent work, as well (Marjanović ...
    ... dimension of the process, as well as detailed element at risk inventory, resulted in a very detailed, very realistic landslide risk map. The map depicts realistic risk distribution over the populated areas. Intermediate models, such as susceptibility, exposure, hazard etc., as well as the final risk model ...
    ... that model well recognizes highly populated areas along the main valley and mainly leaves them in low risk as they are flat and landslide free areas. On the other hand, a good overlap of populated areas and landslide prone areas is achieved (overlap of red and purple polygons in Fig. 9). ...

  • Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites

    Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)
    To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...
    Perovskite/spinel ceramics, Multiferroic, Sintering, Influence of synthesis method