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Упит dcterms_subject_txt:Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

2352 items

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • Efikasnost različitih tipova glina Srbije za adsorpciju metilen plavog

    Maja D. Milošević (2016-12-09)
    Adsorpciona efikasnost različitih uzoraka glina sa lokaliteta Srbije određenaje njihovim tretiranjem različitim koncentracijama rastvora metilen plavog (MP).Detaljna mineraloška karakterizacija ispitivanih glina i rezultati njihove interakcijesa rastvorima MP dobijeni su primenom optičkih, rendgenskih, hemijskih, DTA ispektroskopskih metoda.Na osnovu formiranja MP agregata u izmenljivim pozicijama i površiničestica gline, razlikuju se dva tipa glinovitih minerala: visoko naelektrisani(smektiti) i nisko naelektrisani (kaoliniti). Dimeri se stvaraju na naelektrisanimpovršinama, a granica njihovog razvoja omogućuje determinaciju mineralne vrste.Molekuli MP stoje pod uglom od 21.5o kada se ...
    minerali glina, metilen plavo, kristali metilen plavog, difuznarefleksija, adsorpcija, flokulacija, naelektrisanje slojeva
    ... l results and model calculations. Clays Clay Miner. 46: 340 - 348 Sagara T., Nomaguchi H. and Nakashima N. 1996. Surface anisotropic electroreflectance response at an edge-plane pyrolytic graphite electrode. Journal of Physical Chemistry 100: 6393 - 6396 Salopek B., Krasić D. and Filipović S ...
    ... electrode. Journal of Physical Chemistry 94: 3681 - 3689 Capkova P., Pospisil M. and Lerf A. 2002. Molecular simulations in structure analysis of tantalum sulfide intercalated with methylene blue. Solid State Sciences 4: 671 - 676 Cariati F., Erre L., Gessa C., Micera G. and Piu P. 1983. Polarization ...
    ... surfaces. Journal of Physical Chemistry 95: 6984 - 6990 Hotta Y., Banno T., Nomura Y., Sano S. and Oda K. 1999. Factors affecting the plasticity of Georgia Kaolin Green Body. J. Ceramic Soc. of Japan 107: 868 - 871 Imai G. 1980. Settling behavior of Clay Suspension. Soils and Foundations 20: 61 ...

  • Fizičko-hemijsko raspadanje krečnjaka ugrađenih u objekte Beogradske tvrđave i mogućnost konsolidacije

    Maja Z. Franković (2022)
    Beogradska tvrđava, spomenik kulture od izuzetnog značaja za Republiku Srbiju, izgrađena je od krečnjaka badenske starosti. Njihova litološka heterogenost, u sadejstvu sa uticajima okruženja, rezultira visokim intenzitetima raspadanja. Korelacijom intrinzičnih sa ekstrinzičnim faktorima, definisani su fizičko-hemijski procesi raspadanja ugrađenih mikrofacija krečnjaka. Aplikacijom neorganskih konsolidanata na karbonatnoj bazi (nano-kreča i Ca-acetoacetata) i alkoksisilana, te korelacijom fizičko-mehaničkih svojstava pre i nakon tretmana, ispitana je efektivnost u pogledu zaustavljanja dekohezije krečnjaka. Određivanjem petroloških, tehničkih svojstava i mapiranjem formi raspadanja Mračne kapije kao ...
    krečnjaci, forme i intenziteti degradacije, fizičko-hemijsko raspadanje, konsolidacija, nano-kreč, Ca-acetoacetat, alkoksisilani, Mračna kapija

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... REFERENCES 1. J. Felsche, In The Crystal Chemistry of the Rare-Earth Silicates. Rare Earths. Structure and Bonding, Vol. 13, Heidelberg: Springer, Berlin, Germany, 1973 (https://doi.org/10.1007/3-540-06125-8_3) 2. A. Kitai, In Luminescent Materials and Applications, John Wiley & Sons Ltd., Chichester ...
    ... of optical and magnetic properties combined with high thermal stability.1‒9 All this makes them very interesting and promising materials for different applications. REE silicates also exhibit a broad structural diversity.10 A highly adaptive framework can incorporate almost all REEs and this opens ...
    ... crystal structure of this compound, K3EuSi2O7, has not been described in the literature so far. EXPERIMENTAL Materials and measurements All the materials were of analytical reagent grade and used as received without further purification. The crystal structure of K3EuSi2O7 was analyzed by the sing ...

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • FTIR spectroscopic study оf S-мetolachlor сorption оn inorganic and organically modified montmorillonite from Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... n of montmorillonite as well as the interaction of herbicide S-metolachlor with inorganic and organically modified montmorillonite from Bogovina (Boljevac municipality, Serbia). MATERIALS AND ME THODS Materials HDTMA-bromide was obtained from Alfa-Aesar Chemical Company (Karlsruhe, Germany) ...
    ... quartz, cristobalite and carbonate minerals. Organic montmorillonites were obtained after modification with different concentrations of organic complex (HDTMA and PTMA), whereas inorganic modification was performed with IM NaCI!I solution. The interaction between minerals and herbicide was monitored ...
    ... absorption bands, second derivatives were obtained for all samples. RESULTS AND DISCUSSION FTIR spectroscopy of samples without S-metolachlor Detailed information on the interactions between S-metolachlor and the inorganic and organic montmorillonite was obtained by using infrared spectroscopy. In ...

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

    Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević (2021)
    Изингов модел, хексагонална решетка

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... B). The physical properties of the ash and slag facilitate their use as building materials for transport infrastructure, reducing the use of natural resources inroad building projects. The chemical properties of fly ash and slag are the most important indicator in the evaluation of their suitability ...
    ... of combustion coal, and based on that different values of the chem- ical, mineral and physical compositions are obtained. From the entire study the following conclusions can be drawn: – fly ash and slag have variable chemical, mineralogical and physical properties, and depend on the natural ...
    ... mineral and physical properties of fly ash (VASSILEV & VAS- SILEVA, 2007). Based on the most common characteristics (chemical and mineral composition) of ash and slag from the Ko- lubara and Kostolac coal basins, the research objectives presented in this paper are the laboratory testing and research ...

  • Photocatalytic Activity of the V2O5 Catalyst toward Selected Pharmaceuticals and Their Mixture: Influence of the Molecular Structure on the Efficiency of the Process

    Sanja J. Armaković, Aleksandra Jovanoski Kostić, Andrijana Bilić, Maria M. Savanović, Nataša Tomić, Aleksandar Kremenović, Maja Šćepanović, Mirjana Grujić-Brojčin, Jovana Ćirković, Stevan Armaković (2023)
    Due to the inability of conventional wastewater treatment procedures to remove organic pharmaceutical pollutants, active pharmaceutical components remain in wastewater and even reach tap water. In terms of pharmaceutical pollutants, the scientific community focuses on -blockers due to their extensive (over)usage and moderately high solubility. In this study, the photocatalytic activity of V2O5 was investigated through the degradation of nadolol (NAD), pindolol (PIN), metoprolol (MET), and their mixture under ultraviolet (UV) irradiation in water. For the preparation of V2O5, facile ...
    DFT analysis, metoprolol, nadolol, nanomaterial characterization, photocatalysis, pindolol, β-blocker
    ... Greenwood, J.; Braden, D.; Philipp, D.; Rinaldo, D.; Halls, M.; Zhang, J.; Friesner, R. Jaguar: A high-performance quantum chemistry software program with strengths in life and materials sciences. Int. J. Quantum Chem. 2013, 113, 2110-2142. [CrossRef] Cao, Y.; Halls, M.; Vadicherla, T.; Friesner, R.A ...
    ... mechanism and the generation of various intermediates during the degradation process (Figures 10 and 13). 3. Materials and Methods 3.1. Chemicals and Solutions The active components of B-blockers, NAD (>99%, Sigma-Aldrich, Hamburg, Ger- many), PIN (>99%, Sigma-Aldrich, Hamburg, Germany), and MET (>99% ...
    ... experimental and theoretical study. RSC Aduv. 2015, 5, 54589—54604. [CrossRef] Armaković, S.; Armaković, S.; Šibul, E; Četojević-Simin, D.; Tubić, A.; Abramović, B. Kinetics, mechanism and toxicity of intermediates of solar light induced photocatalytic degradation of pindolo]: Experimental and computational ...

  • Remedijacija otpadnih voda Rudnika prirodnim zeolitom

    Igor Veličković (2024)
    U radu je razmatrano prečišćavanje otpadnih flotacijskih voda sa područja rudnika Rudnik prirodnim zeolitskim tufom sa planine Jastrebac. Prečišćavanje otpadnih flotacijskih voda sa područja rudnika Rudnik prirodnim zeoliskim tufom sa obronaka planine Jastrebac pokazala se veoma efikasnom. Naime, u tri otpadne flotacijske vode utvrđen je povišen sadržaj arsena, hroma, gvožđa, mangana, kao i nikla. Jednostavnim tretmanom zeolitskim tufom iz ovih voda uklonjeni su svi ovi elementi. Sadržaji gvožđe i mangana su sniženi od 95 do 99 %, dok su ...
    flotation waste water, zeolite tuff, purification
    ... Mineralogy and genetic characteristics of the Rudnik Pb-Zn/ Cu,Ag,Bi,W polymetallic deposit (Central Serbia) - new occurrence of Pb(Ap)Bi sulfosalts. Periodico di Mineralogia 85, 121—135. Shoumkova A. 2011. Published by the Australian Institute of High Energetic Materials Zeolites for water and wastewater ...
    ... Other Inorganic Anions by Organo-Zcolite. Environ. Sci. Technol. 1994, 28, 452—458. Janković, S., 1984. Major metallogenic units and ore deposits in Yugoslavia. In: Exp. Memoir of the Metallogenic Map of Europe, 1:2500000. UNESCO, Paris, pp. 385—395. Janković, S., 1990. Ore Deposits of Serbia. ...
    ... Tumač za list Kragujevac, L34- 138, OGK SFRJ 1:100000. Savezni Geološki Zavod, p 60. Breck D.W., 1974. Zeolite molecular sieves: Structure, chemistry and use. New York, USA. Cvetković, V., Šarić, K., Pćcskay, Z., Gerdes, A., 2016. The Rudnik Mts. Volcano- Intrusive Complex (central Serbia): ...

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... Materials and methods The materials and methods chapter, and the results and dis- cussion chapter, follow Fig. 3, which displays the research workflow. Data sources, including multispectral satel- lite imaging, geophysical data, and geological data, are described in the materials and methods ...
    ... algorithms RF and KNN with various data. In this study, both RF and KNN were used to combine satellite multispectral data with geo- physical airborne and terrestrial data, as well as the distance to fault map, as features. Incorporating these data, particu- larly geophysical data (airborne and terrestrial) ...
    ... geological and geo- physical data, and this was the primary reason for using this algorithm to predict ophiolite. Tuning and validation are essential components of all ML -based models, including the RF algorithm. According to previous research (Breiman 2001; Catani et al. 2013; Harris and Grunsky ...

  • Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    kvalitet podzemnih voda, arsen, analiza rizika, Panonski Basen
    ... by high con- centrations of naturally-occurring organic substances, and the presence of humic and fulvic acids and their salts. This is a result of their inability to break down into inorganic end products due to a lack of oxygen and bacteria in the ground- water, such that the organic substances are ...
    ... more other elements such as oxygen, chlorine, and sulfur. This combination is referred to as inorganic arsenic. Arsenic combined with carbon and hydrogen is referred to as organic arsenic. The organic forms are usually non-toxic or less toxic than the inorganic forms. The two most com- mon non-toxic forms ...
    ... forms of organic arsenic are arsenobetain and arsenocholine. Organic arsenic is completely excreted within 1 to 2 days after ingestion and there are no residual toxic metabolites. In natural waters, arsenic is mainly pre- sent in its inorganic forms, As (V) and As (III). Compounds of As (III) are generally ...

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... gas mixture of UCG, and its possible storage carbon capture and storage, depends on the technological development of the separation and storage of CO [3]. Syngas can be used to produce a number of usable products, such as electricity, liquid fuels and chemical raw materials. The competitiveness ...
    ... coal roof and coal fioor. Coal gasification chemistry includes Gasification cavity shape seven primary reactions occurring within the with CRIP layer. The primary reaction that happens is the displacement reaction of the generated water vapor (H.O) and gas, where water vapor and carbon from ...
    ... the massif, unlike surface waters, have been ex- posed to significantly different physical-chemical conditions and interdependencies, where the concentration of dissolved substances in them is much more diverse and changes according to the specific rules all the time. This is especially the case ...

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... by high con- centrations of naturally-occurring organic substances, and the presence of humic and fulvic acids and their salts. This is a result of their inability to break down into inorganic end products due to a lack of oxygen and bacteria in the ground- water, such that the organic substances are ...
    ... more other elements such as oxygen, chlorine, and sulfur. This combination is referred to as inorganic arsenic. Arsenic combined with carbon and hydrogen is referred to as organic arsenic. The organic forms are usually non-toxic or less toxic than the inorganic forms. The two most com- mon non-toxic forms ...
    ... forms of organic arsenic are arsenobetain and arsenocholine. Organic arsenic is completely excreted within 1 to 2 days after ingestion and there are no residual toxic metabolites. In natural waters, arsenic is mainly pre- sent in its inorganic forms, As (V) and As (III). Compounds of As (III) are generally ...

  • Effects of external noise on threshold-induced correlations in ferromagnetic systems

    Dragutin Jovković, Sanja Janićević, Svetislav Mijatović, Lasse Laurson, Đorđe Spasojević (2021)
    Изингов модел, праг детекције, екстерни шум

  • Određivanje zbijenosti starog komunalnog otpada

    Jovana Janković, Dragoslav Rakić, Irena Basarić Ikodinović, Tina Đurić (2021)
    Bez obzira na savremene tretmane komunalnog otpada u svetu, u Srbiji je i dalje najčešći vid odlaganja na komunalne deponije, pa zbijanje otpada predstavlja jednu od ključnih faza formiranja deponije. Na ovaj način znatno se smanjuje zapremina otpada, ubrzava proces degradacije i produžava radni vek deponije. Zbog toga su geotehničke karakteristike komunalnog otpada prilikom zbijanja, veoma bitne kako u fazi projektovanja tako i u fazi izgradnje deponije i optimizacije prostora. Tu se pre svega misli na maksimalnu suvu zapreminsku ...
    komunalni otpad, deponija, Proktorov opit, optimalna vlažnost, maksimalna suva zapreminska težina

  • 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
    ... Minerals, Metallurgy and Materials, 2011. 74. Kremenović A., Antić B., Blanuša J., Čomor M., Colomban P., Mazerolles L., Božin E. S.: Heterogeneity and Disorder in Ti1-xFeyO 2- d nanocrystal rutile-based flowerlike aggregates: Detection of anatase, Journal of Physical Chemistry C, 2011. 75. Gligorić ...
    ... B.: Metals in the sediment and liver of four fish species from different trophic levels in Tisza River, Serbia, Chemistry and Ecology, 2013. 219. Ćosović V., Pavlović M., Ćosović A., Vulić P., Premović M., Živković D., Talijan N.: Microstructure refinement and physical properties of Ag-SnO2 4 ...
    ... Đorđević T.: Ionothermal synthesis and crystal structure of new organic-inorganic hybrid compound (C6H11N2)2[Cu5Br7], Acta crystallographica. Section C, Structural chemistry, 2014. 288. Bragina L., Bragin N., Đerić N., Gajić V.: Late cretaceous radiolarians and age of flyschoid sediments in the ...

  • 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

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika