Претрага
312 items
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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... n of phase composition and morphology. The magnetic, dielectric, and ferroelectric properties were investigated. The optimal phase composition in the BaTiOy /NiFe»Ou composite, sintered at 1150 ?"C, resulted in a wide frequency range stability. Addi- tionally, particular phase composition indicates ...
... Table 1. The phase composition of prepared composites. In parenthesis next to the phase chemical formulae crystal system and space group are presented as well as corresponding, PDF card numbers from the ICDD database. Phase abundances are calculated by the RIR method. Samples Phase BaTiOs Nii ...
... 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 composition was obtained (Table 1) and the microstructure ...Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković. "BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties" in Inorganics, MDPI AG (2023). https://doi.org/10.3390/inorganics11020051
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Phase and microstructural study of urinary stones
In this paper we present the phase and morphological characteristics of urinary stones from Serbian patients. The study included for the first time the determination of the phase composition and a statistical analysis of the presence of different types of urinary stones in both men and women in Serbia. The main goal of study was representation of collected data for the first time. For past three years, more than 600 samples were collected from Serbian patients. The phase composition ...бубрежно камење, фазни састав, статистика, рендгенска дифракција праха, скенирајућа електронска микроскопијаMiljana Mirković, Anja Dosen, Suzana Erić, Predrag Vulić, Branko Matović, Aleksandra Rosić. "Phase and microstructural study of urinary stones" in Microchemical Journal, Elsevier BV (2019). https://doi.org/10.1016/j.microc.2019.104429
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Properties of fly ash and slag from the power plants
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... As- sociation, 1–24. VASSILEV, S., BAXTER, D., ANDERSON, L. & VASSILEV, C. (2013): An overview of the composition and application of biomass ash. Part 1. Phase-mineral and chemical composition and classification.– Fuel, 105, 40–76. VASSILEV, S., BAXTER, D. & VASSILEV, C. (2014): An overview of the ...
... R. (2003): Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 1. Characterization of feed coals and fly ashes.– Fuel, 82, 1793–1811. VASSILEV, S., MENENDEZ, R., ALVAREZ, D., DIAZ-SOMOANO, M. & MARTI- NEZ-TARAZONA, R. (2004a): Phase-mineral and ...
... and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 2. Characterization of ceramic cenosphere and salt concentrates.– Fuel, 83, 585–603. VASSILEV, S., MENENDEZ, R., BORREGO, A., DIAZ-SOMOANO, M. & MARTI- NEZ-TARAZONA, R. (2004b): Phase-mineral and chemical c ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Properties of fly ash and slag from the power plants" in Geologia Croatica, Zagreb : Croatian Geological Survey (2016). https://doi.org/10.4154/gc.2016.26
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Ni–Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects
Jović Vladimir, Lačnjevac Uroš, Jović Borka, Karanović Ljiljana, Krstajić Nedeljko.. "Ni–Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects" in International journal of hydrogen energy 37 no. 23, Radarweg 29; Amsterdam, 1043 NX; Netherlands:Elsevier BV (2012): 17882-17891. https://doi.org/10.1016/j.ijhydene.2012.09.110
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Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic
This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композицијаMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović. "Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic" in Energies, MDPI AG (2022). https://doi.org/10.3390/en15186786
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Effect of natural gas composition on methane number: A case of gas reservoirs in Serbia
Natural gas is considered as the most environmentally acceptable fossil fuel, thus it is an alternative to petroleum derivate, dominantly used in internal combustion engines. Physical properties of a fuel as well as behavior during combustion process are affected by its composition. This article presents analysis of effect of natural gas composition on methane number (MN), conducted for natural gas deposits in Serbia. For empirically determination of MN: California air resources board (CARB) method and Linear and Anstalt für ...Marija Živković, Milica Ivić, Dejan Ivezić, Aleksandar Madžarević. "Effect of natural gas composition on methane number: A case of gas reservoirs in Serbia" in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects (2017). https://doi.org/10.1080/15567036.2017.1403518
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Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System)
Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević, Ksenija Stojanović (2021)The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined. The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently ...... isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their ...
... Измењено: 2023-10-14 04:29:21 Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System) Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević, Ksenija Stojanović ...
... Stojanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System) | Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić ...Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević, Ksenija Stojanović. "Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System)" in 30th International Meeting on Organic Geochemistry (IMOG 2021), European Association of Geoscientists & Engineers (2021). https://doi.org/10.3997/2214-4609.202134040
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Laboratory testing of fly ash
Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction... classes of pozzolanic material can be identified as given in Tab. 5. The composition of pozzolan mainly includes oxides SiO2, Al2O3 and Fe2O3. These oxides are usually present in the form of an amorphous (glassy phase) that causes pozzolanic activity: during the reaction between Al and Si ...
... 1983 to 2004, testing of chemical composition was done for 59 samples and results are presented in Tab. 1. Table 1 The results of the chemical composition of ashes from PPNT A for the period from 1983 to 2004 Chemical composition min max mean Ash composition, mass / % SiO2 21,98 71,75 53 ...
... classifications, by chemical composition, content of specific oxides, means of depositing and other, but previous classifications are most commonly used in practice. 3.2 Test results of mineral composition of fly ash X-ray diffraction is determined by the mineral composition of the ash and slags ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Laboratory testing of fly ash" in Tehnički vijesnik (2016). https://doi.org/10.17559/TV-20150317171035
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Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)
Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović. "Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)" in Physics and Chemistry of Minerals, Springer Science and Business Media LLC (2014). https://doi.org/10.1007/s00269-014-0693-x
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Microemulsion with aromatic oil as cleaner media for electropolymerisation
Abstract Microemulsion polymerization is widely used as a cleaner alternative way to prepare intrinsically conductive polymers. We studied isothermal phase diagrams for microemulsions of the electropolymerizable heterocyclic aromatic oil 3,4-ethylenedioxythiophene (EDOT), aqueous LiClO4 solution and alkyl polyethoxylate. Our specific goal was to assess the effect of LiClO4 salt on the phase behaviour. The phase behaviour was characterized by stepwise titration and microscopic analyses. Here we found that the increase of the concentration of LiClO4 salt shifts the microemulsion region ...M. Ilić, F.-H. Haegel, S. Zlatanovic, N. Potkonjak, B. Simonovic. "Microemulsion with aromatic oil as cleaner media for electropolymerisation" in Environmental Chemistry Letters, Springer Science and Business Media LLC (2005). https://doi.org/10.1007/s10311-005-0101-3
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Phase relations and physical indicators of municipal waste from old landfills in Serbia
Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science... three-phase system for municipal waste does not take into account a fact that the composition and thus the volume of organic materials, i.c. part of a solid phase, 106 changes over time. Therefore, it should be noted that there is a different representation of municipal waste phase composition ...
... ceramics, glass and similar materials. All other materials would be in organic phase. This four-phase representation of municipal waste phase composition allows to determine basic physical parameters in a certamn stage of degradation and to display their change, if the initial conditions are known ...
... etc. (Vosniakos and Patronic, 2009). Therefore, data on the composition, shape and size of n i Ra5 o — - particles in the landfill can be of great use in defining m:;';]on and selection || > M @523331 the phase composition and physical indicators of iušLte008| Y Horanalysis| municipal waste. In addition ...Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić. "Phase relations and physical indicators of municipal waste from old landfills in Serbia" in Japanese Geotechnical Society Special Publication, The Japanese Geotechnical Society (2021). https://doi.org/10.3208/jgssp.v09.cpeg016
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Contribution to the geotechnical classification of municipal waste landfills in Serbia
Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental EngineeringDragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić. "Contribution to the geotechnical classification of municipal waste landfills in Serbia" in Environmental Geotechnics, Thomas Telford Ltd. (2018). https://doi.org/10.1680/jenge.18.00028
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Fuzzy Model for Risk Assessment of Machinery Failures
The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...... depending on the classification. 3.3. Fuzzy Composition upon a Level of Risk Assessment The synthesis of risk indicators is performed based on appropriate fuzzy composition. According to Kundu [30], min–max composition is more precise than max–min composition in the sense that there is a concentration ...
... structures (using min–max composition). The outcome is defined as the expected (mean value) grade in the min–max composition. In other words, an RPN number is used, where all partial risk indicators equally impact the risk assessment. In the case of a level three min–max composition, the outcome can be ...
... Subsystem Using Min–Max Composition A risk level assessment for the elements in a subsystem was done based on a symmetric min–max composition of the analyzed risk indicators: failure severity, frequency of occurrence, and the ability to detect a failure. The min–max composition of the fuzzy sets was ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy Model for Risk Assessment of Machinery Failures" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12040525
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Comparative study of Serbian Miocene coals – insights from biomarker composition
Stojanović Ksenija, Životić Dragana (2013)Stojanović Ksenija, Životić Dragana. "Comparative study of Serbian Miocene coals – insights from biomarker composition" in International Journal of Coal Geology 107 no. 1, Amsterdam, Netherlands:Elsevier BV (2013): 3-23. https://doi.org/10.1016/j.coal.2012.09.009
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Mineral composition of sulphide-oxide Pb - Zn ore from Rudnik mine
Tomanec Rudolf, Lazić Predrag (2012)Tomanec Rudolf, Lazić Predrag. "Mineral composition of sulphide-oxide Pb - Zn ore from Rudnik mine" in Underground Mining Engineering no. 21, Beograd:Faculty of Mining and Geology, University of Belgrade, Belgrade (2012): 151-159
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Crystal Structure and Chemical Composition of Ludwigite from Vranovac Ore deposit (Boranja Mountain, Serbia)
Tančić Pavle, Dimitrijević Radovan, Poznanović Maja, Pačevski Aleksandar, Sudar Slobodanka. "Crystal Structure and Chemical Composition of Ludwigite from Vranovac Ore deposit (Boranja Mountain, Serbia)" in Acta Geologica Sinica 86, Beijing:Geological Society of China (2012): 1524-1538
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Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf (Note)
Poleti Dejan, Karanović Ljiljana, Zdujić Miodrag, Jovalekić Čedomir. "Phase composition of Bi2O3 specimens doped with Ti, Zr and Hf (Note)" in Journal of the Serbian Chemical Society 77 no. 8, Karnegijeva 4/3, 11000 Beograd:Srpsko hemijsko društvo (2012): 1091-1096. https://doi.org/10.2298/JSC110914215P
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Deformation and permeability of cement stone of diferent composition in hard formations
Bošković Zvonimir, Čebašek Vladimir, Nuhanović Sanel, Crnogorac Jovana. "Deformation and permeability of cement stone of diferent composition in hard formations" in Rudarski radovi/Mining Engineering no. 2, Resavica:Komitet za podzemnu eksploataciju mineralnih sirovina/Committee of Underground Exploitation of the Mineral Deposits (2014): 37-45
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Variety in texture and chemical composition of pyrite from the Čoka Marin polymetallic deposit, Serbia
Pačevski Aleksandar, Šarić Kristina (2010)Pačevski Aleksandar, Šarić Kristina. "Variety in texture and chemical composition of pyrite from the Čoka Marin polymetallic deposit, Serbia" in 20th General Meeting of the International Mineralogical Association, 21–27 August, 2010, Budapest, Hungary, Acta Mineralogica-Petrographica, Budapest: (2010): 6-6
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Mineral composition of PM10 particles from the atmosphere near the coal mine power plant: Veliki Crljeni (Serbia)
Cvetković Željko, Logar Mihovil, Erić Suzana. "Mineral composition of PM10 particles from the atmosphere near the coal mine power plant: Veliki Crljeni (Serbia)" in Acta Mineralogica – Petrographica, Abstract Series, IMA 2010 - 20th General Meeting of the International Mineralogical Association 6, Szeged, Hungary:Dept. of Mineralogy, Geochemistry and Petrology, University of Szeged (2010): 324