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Упит dcterms_subject_txt:chemical composition

312 items

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • GIS Application Improvement with Multilingual Lexical and Terminological Resources

    Ranka Stanković, Ivan Obradović, Olivera Kitanović (2010)
    ... properties for features within the same layer. For example, in a layer of geologic units, the user might label those with a general type of geologic composition, genesis, morphology term, geologic process, metamorphic grade etc. Development of GeolISSTerm and its integration within GeolISS provides ...

  • OER obrazovni sadržaji kao spona između akademskog i preduzetničkog znanja

    Ivan Obradović, Ranka Stanković, Marija Radojičić (2014)
    ... [13] M. Allon. ‘Operations Management’, Udemy. Chronicle of Higher Education, 59(6), 2012, B10–11. [14] J. Rice. What I learned in MOOC. College Composition and Communication, 64(4), 2013, 695–703. [15] Y. Belanger, J. Thornton. Bioelectricity: quantitative approach. Retrieved on May 7 from http:/ ...

  • Effects of Energy Production and Consumption on Air Pollution in Serbia

    Marija Živković (2019)
    Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...
    energy related emissions, Serbia
    ... points of air pollution. Estimation of pollutants emission is more demanding comparing with determination of carbon dioxide emission. Besides fuels composition values of emission factors are strongly driven by the nature of combustion processes (excess air coefficient, level of mixing fuel and oxidizer, ...

  • Geotechnical conditions of “Debelo brdo” tunnel construction on the highway E-80: Nis-Merdare-Pristina (“Peace Highway”)

    Dragoslav Rakić, Irena Basarić Ikodinović, Radojica Lapčević, Dragan Lukić (2024)
    The construction of the highway E-80 has begun in Serbia, which will represent the traffic hub of the Western Balkans and will be part of the main regional transport network of Southeast Europe. Its total length through Serbia is 77 km, and one part of the route is designed through a typical plain terrain, while a larger part of the route passes through hilly terrain. The construction of the tunnel “Debelo brdo” is planned partly in an open cut ...
    „Debelo brdo“ tunnel, temporary slopes, open cut excavation, tunnel excavation, piles

  • Improvement of geodatabase queries within GeolISS

    Ranka Stanković (2008)
    ... (e.g. attributes) that characterize some geological occurrence. The description tables of basic geological entities (mapped unit, lithology composition and geological structure) contain common attributes that specify the purpose and context of the description. The description purpose attribute ...

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... village of Slovac. The limestone deposit "Nepričava" is consisted of rock masses of sedimentary origin, which are not entirely homogeneous in composition. Limestones are the most important lithological members from both economic aspect and aspect of mining exploitation technology. Physical and mechanical ...

  • Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world

    Bogoljub Vučković, Bojan Dimitrijević (2023)
    The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...
    lignite, heavy metals, concentrations
    ... layers; as well as from the ashes after burning the same samples. A total of 155 samples were taken from coal and 45 from 179 ash. A total of 22 chemical elements were analyzed. Here is an overview of three. It can be concluded that there is a certain lateral zonation of the distribution of Zn, Cu ...
    ... DISTRIBUTION A large number of individual samples were taken in the vertical profile and 17 lithological members were laboratory tested for 22 chemical elements, including the surface humus layer, gravel, coal layers and all types of clay and sand. A presentation of the vertical distribution of ...
    ... contents of heavy metals in the top soil of the mentioned cities in Serbia, Region, Europe and World are mainly a consequence of the geological composition and geochemical background of that region, as well as anthropogenic/industrial influence. REFERENCES: 1. Aguilera A., Bautista F., Gutierez-Ruiz ...

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... column of the exploration borehole. Test samples D and AD undoubtedly show the same structural-textural character- istics, as well as the mineral composition. Only the intensities of secondary alterations, calcification, limonitization, and chlorination are different (Figure 2). The analyzed rock material ...
    ... Tziallas et al. [1] and Berisavljević et al. [6]. The reasons for this should be sought in the effect of rock material mineralogical- petrographic composition and micro-heterogeneity (heterogeneity on the level of mineral grains of individual rock types). The values of the constant mi are calculated based ...

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Maja Franković, Nevenka Novaković, Vesna Matović (2015)
    The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...
    Krečnjak, mapiranje, Indeks raspadanja, brzina raspadanja, progresija
    ... compounds are fossil fragments of red algae (Lithotamnium ramisissimum; family Corallinaceae) (Fig.2e). The algal remains are micrite in composition with a well-developed and promi- nent mesh texture consisting: of micron-sized rectangle chambers. Fragments of some other species (diverse asso- ...
    ... Rudstone |0 Grainstone MB Brick Fig. 3 The results of the lithological mapping of rock types for south and north facades of the Dark Gate composition. Bioclasts include shallow water, macrofaunal remains, usually completely recrystallized and molds of microfauna as well as algal debris (Fig ...

  • Granatski amfiboliti Bistrice

    Jovana Opančina (2024)
    Predmet ispitivanja ovog završnog rada su granatski amfiboliti Bistrice. Izvršena su petrografska i hemijska ispitivanja s ciljem da se odredi stepen metamorfizma, protolit ispitivanih stena i P-T uslovi nastanka. Ispitivani granatski amfiboliti geografski pripadaju Prijepolju, tačnije nalaze se na ulasku u Prijepolje, mesto Bistrica. Geološka građa obuhvata uglavnom mezozojske tvorevine među kojima se nalaze sedimentne, magmatske i metamorfne stene. Geološki procesi koji su doveli do stvaranja amfibolita su procesi subdukcije i obdukcije koji su se pretpostavljamo dešavali na većim ...
    granatski amfiboliti, Bistrica, elektronska mikrosonda, polarizacioni mikroskop

  • Improvement of education through the cooperation between CEEPUS EURO Geo-Sci network and scientific projects: examples from UB-FMG

    Kristina Šarić, Dejan Prelević, Miloš Marjanović, Uroš Stojadinović, Vladimir Simić (2024)
    CIII-RS-0038, Recon Tethys, DEMONITOR, TMCmod, REASONING

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... favorable feedstock energy because of their high calorific value, low ash content, and slagging rate [20]. The basic information and material composition of HSs are given in Table 2 [21], [22]. The materials mentioned in Table 2 form the bulk of the furnace’s weight (90%). Other materials that constitute ...

  • Extreme Rainfall Event and Its Aftermath Analysis—IPL 210 Project Progress Report

    Biljana Abolmasov, Mileva Samardžić Petrović, Ranka Stanković, Miloš Marjanović, Jelka Krušić, Uroš Đurić (2021)
    Landslides, Extreme precipitation, Data analysis, IPL project report

  • Konceptualni model hidrogeotermalnog sistema šire okoline Brusa - geološki, geofizički i hidrogeološki uslovi / Conceptual model of hydrothermal system of Brus area - geological, geophysical and hydrogeological condition

    Dejan Milenić, Ana Vranješ, Marinko Toljić, Ivana Vasiljević, Natalija Radosavljević, Matija Ognjanović (2024)
    Na širem području Brusa izvedena su naučna multidisciplinarna istraživanja za potrebe ocene geotermalnog potencijala sa zadatkom de9inisanja uslova formiranja geotermalnih i termomineralnih resursa. Interpretacijom podataka zaključeno je da je na predmetnom terenu formiran "hibridni" hidrogeotermalni sistem, koji sadrži elemente sistema u rov-strukturi i elemente konvektivnog hidrogeotermalnog sistema sa rezervoarom u pokrivaču granitoidne intruzije. Sistem čine dva nezavisna hidrogeotermalna rezervoara. Prvi rezervoar formiran je u gornjokrednim krečnjacima na dubini od oko 1550 m. Maksimalne prognozne temperature hidrogeotermalnih resursa u krečnjačkom ...
    hidrogeotermalni sistem, gornjokredni krečnjaci, trijaski mermeri, Brus

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... oceanic crust, 2) Middle and Upper "Triassic ribbon radiolarites, and 3) open marine limestones from the continental slope. On the basis of this composition we can conclude that the Upper Triassic radiolarite clasts derive cither from 1) the younger parts of the sedimentary succession above the oceanic ...
    ... and cvolution of oceanic volcanic rocks in the Central and Northern Balkans. Lifhos 108, I—4, 72—105. Zuffa G.G. 1980: Hybrid arenites: thcir composition and classifi- cation. J. Sediment. Petrol. 50, 21—29. Zuffa G.G. 1985: Provenance of arenites. D. Reide/! Publishing, Dordrecht, 1—408. GEOLOGICA ...

  • Хидрогеохемијске карактеристике и квалитет вода слива Требишњице, Република Српска, Босна и Херцеговина

    Dragoslav R. Banjak (2016-08-25)
    Упркос неповољном временском и просторном распореду, воде су најзначајнијиприродни ресурс Источне Херцеговине. Ова чињеница довела је до реализацијепројекта „Вишенамјенског хидросистема Требишњица“, којим је, премаМилановићу (2006), до сада обухваћено: седам хидроелектрана, шестакумулација, шест брана, шест тунела укупне дужине 59,7 km, неколикоприступних тунела, 62,5 km бетонског канала кроз Попово поље, канал крозДабарско (6750 m) и Фатничко поље (2770 m) и систем тунел-канал или цјевоводпрема Дубравама.У почетку са доминантним енергетским предзнаком, концепција јетрансформисана у интегрално рјешење вишенамјенског коришћења и заштитевода и животне ...
    хидрогеохемијски процеси, мултиваријантна статистичкаанализа, инверзно геохемијско моделовање, квалитет воде, употребиљивост водеза наводњавање, слив Требишњице
    ... Gorica it is confirmed that the primarily significance in forming its chemical composition has a drain from accumulation Bileća, then the Sušica river, but the impact of the spring in Lastva is unsignificant. Chemical composition of the water in the river Trebišnjica catchment is a result of environment ...
    ... water quality, have not been made. The main factors which determine water chemical composition and their quality are relations rock-water, water regime, rainfall, antropogenic impact, geolocical structures, mineral composition of aquifer and their geological processes (Abreha, 2014). Mutual influences ...
    ... the impact of pollutants. Inverse modelling in the river Trebošnjica catchment has been made in order to reconstruct chemical evolution of water and changes in chemical composition along the flow path. There are two kinds of inverse geochemical model: evolution of undergruond water between two ...

  • Споменица 1991. – 2015. година: 135 година геологије и 70 година рударства на Универзитету у Београду

    главни и одговорни уредник Душан Поломчић (2016)
    Рударско-геолошки факултет
    ... U., Jović Borka M., Karanović L., Krstajić Nedeljko V.: Ni–Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects, International journal of hydrogen energy , 2012. 152. Ivić A., Wu J.: On the General Additive Divisor Problem ...
    ... geochemical studies. Journal of Serbian Chemical Society, 77, 1109–1127, doi:10.2298/JSC111126017S ŽIVOTIĆ D., STOJANOVIĆ K., GRŽETIĆ I., JOVANČIĆEVIĆ B., CVETKOVIĆ O., ŠAJNOVIĆ A., SIMIĆ V., STOJAKOVIĆ R., SCHEEDER G., 2013: Petrological and geochemical composition of lignite from the D field, Kolubara ...
    ... acid treatment on the composition of bentonite. Clays and Clay Minerals, 54 (6), 697–702. NOVAKOVIC T., ROZIC LJ., PETROVIC S., ROSIC A., 2008: Synthesis and characterization of acid-activated Serbian smectite clays obtained by statistically designed experiments. Chemical Engineering Journal, 137 ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... threads and a square section for gripping with wrenches during installation and removal [3.,8]. The chemical composition of the steel used for making sucker rods varies. Based on the steel composition, pumping rods are generally classified into tvo groups: carbon– manganese and nickel-molybdenum groups ...
    ... Seal Head- zaptivna glava • „Automatic Dynamometer Recording System (optional) • Kezing-Tubing Connection, also known as Short Connection • Chemical Injection System (optional) 4.1 Horsehead Horseheads are mechanical installations installed on the surface that lift the rod strings and fluid ...