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Упит dcterms_subject_txt:dielectric properties

364 items

  • 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
    ... ultraviolet (UV) irradiation in water. For the preparation of V»Os, facile hydrothermal synthesis was used. The structural, morphological, and surface properties and purity of synthesized V»Os powder were investigated by scanning, electron microscopy (SEM), X-ray, and Raman spectroscopy. SEM micrographs ...
    ... [3] and incomplete removal by wastewater treatment plants, B-blockers are persistent in water environments and they may show potential toxic properties against nontarget organisms, i.e., aquatic organisms Molecules 2023, 28, 655. https:/ /doi.org,/10.3390/ molecules28020655 https:/ /www.mdpi.c ...
    ... the most used medicines in this class, and its usage increased four times in recent years [4]. Pindolol (PIN, Figure 1) possesses lipophilic properties and at natural pH is almost completely insoluble in water [5,6]. Nadolol (NAD, Figure 1) is another medicine from the B-blockers class, which ...

  • Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia

    Maja Milošević, Bojan Kostić (2022)
    ... in this region, therefore an adequate identification of their mineralogy and physicochemical properties is an important step to a potential technical application in the future. Characteristic properties of the sample were determined by chemical analysis, infrared spectrophotom- etry (Milošević and ...
    ... Logar, 2014; Milošević, 2011), differential thermal analysis (DTA) and X-ray diffrac- tion (powder, oriented, saturated and heated). The physical properties were determined by granulometry (pipette method), cation exchange capacity (CEC) and specific surface area (SSA) measurements. The sample consists ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... diffraction analysis, Raman spectral analysis, elemental analysis, and determination of textural and morphological properties. Obtained results showed dependence of investigated properties and the nature of precursors (glucose or fructose) as well as the type of hydroxides used as activating agents. After ...
    ... diffraction analysis, Raman spectral analysis, elemental analysis, and determination of textural and morphological properties. Obtained results showed dependence of investigated properties and the nature of precursors (glucose or fructose) as well as the type of hydroxides used as activating agents. After ...
    ... to remove different contaminants. For activated carbons, universality and adsorption properties, structure, carbon content, specific surface, etc. are very important [40] and to get material with the best properties, it is necessary to apply different preparing conditions and perform detailed charac ...

  • Hydrochemical indicators of groundwater flow in the area of “Čukaru Peki” Cu-Au underground mine in eastern Serbia

    Nebojša Atanacković, Vladimir Živanović, Jana Štrbački, Veselin Dragišić, Ivana Cvejić (2022)
    The physical and chemical properties of groundwater, together with the groundwater levels regime and rock hydraulic properties, are often used to understand and conceptualize the hydrogeological system. Prediction of the influence of mining works on groundwater, and vice versa, is a challenge due to significantly altered groundwater flow patterns in the raw materials exploitation areas in relation to natural conditions. Therefore, multiple parameters are assessed and monitored before and during exploitation to properly characterize and quantify the system for ...
    mine water, hydrogeology, multivariant statistics, groundwater inflow, water quality

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... Section 2. Section 3 presents some properties of Serbian phonology that are relevant for syllabification, and the Serbian alphabets (both Latin and Cyrillic). Then, the language material used is introduced. In Section 4, mathematical models for syllable properties under study (the rank-frequency d ...
    ... Biljana Lazić2 Sebastijan Kaplar3 Ranka Stanković4 Ivan Obradović5 Ján Mačutek6 Lívia Leššová7 Abstract. Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented ...
    ... 115 Cairns & Raimy, 2011, p. 1; Ladefoged & Johnson, 2011, p. 310). Consequently, it is very difficult to conduct a systematic study of syllable properties, as different definitions – which are to be expected if there is no established approach – inevitably lead to results which are not comparable ...

  • 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

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... pressure applied to the samples [61,62]. Since the electrical conductivity influences the polarizability of electron conductors, impedance or dielectric measurements can be in principle used for the determination of the conductivity and the degree of graphitization of carbon particles [15]. 'The ...
    ... frequencies above 100 Hz the resence of water in the saturated samples leads to an increase of o", even for the sample with ure sand, due to the high dielectric constant of water. The hydrochars approach the curve of PLOS ONE | hitps://doi.org/10.1371/journal.pone.0277365 November 17, 2022 28/38 PLOS ...
    ... however, could be a way for determining the degree of graphitization for carbon materials. The electrical impedance is closely related to the dielectric permittivity that has been used as a measure for graphitization by Abdelsayed et al. [15], but was determined on PLOS ONE | hitps://doi.org/10 ...

  • Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications

    Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалима

  • Флотабилност халкопирита из полиметаличне руде рудника „Рудник”

    Ђурица Н. Никшић (2022)
    The doctoral dissertation Chalcopyrite flotability from polymetallic "Rudnik" mine ore consists of two parts. The first part is a general part in which the theoretical foundations of the flotation concentration process, the flotation properties of chalcopyrite, the influence of certain flotation reagents and the mechanism of action on the flotation properties of chalcopyrite are presented. This part also describes the process of flotation concentration of polymetallic ore from the "Rudnik" mine. The second part is ...
    Халкопирит, флотацијска концентрација, KAX, NaCN, pH пулпе

  • 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

  • Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings

    Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić (2018)
    ... performed experimental investigations on copper ore [17]. The basic physical and mechanical properties of the rock mass were determined on samples in the laboratory. By examining the physical and mechanical properties of the work environment, the following values were obtained: • compressive strength, σp ...
    ... both economic aspect and aspect of mining exploitation technology. Physical and mechanical properties of limestone in the deposit are spatially very uneven. Examination of physical and mechanical properties of the working environment, submitted the following results: • Compressive strength 21.1–93 ...
    ... the character and behavior of the pattern of seismic wave indicate that the intensity and nature of the seismic wave are influenced by rock mass properties, and by blasting conditions. For evaluation and control of the seismic effect of blasting operations, the most commonly used equation is that of ...

  • Bridging Computational Lexicography and Corpus Linguistics: A Query Extension for OntoLex-FrAC

    Christian Chiarcos, Ranka Stanković, Maxim Ionov, Gilles Sérasset (2024)
    OntoLex, dominantni standard zajednice za mašinski čitljive leksičke resurse u kontekstu RDF-a, Linked Data i tehnologija Semantičkog veba, trenutno se proširuje sa posebnim modulom za Frekvencije, Primere i Informacije zasnovane na Korpusu (OntoLex-FrAC). Predlažemo novi komponent za OntoLex-FrAC, koji se bavi inkorporacijom korpusnih upita za (a) povezivanje rečnika sa korpusnim mašinama, (b) omogućavanje RDF baziranih web servisa da dinamički razmenjuju korpusne upite i podatke odgovora, i (c) korišćenje konvencionalnih upitačkih jezika za formalizaciju unutrašnje strukture kolokacija, skica reči i ...
    standardizacija, digitalna leksikografija, OntoLex, upiti korpusa, povezani podaci, Lingvistički povezani otvoreni podaci

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    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
    ... municipal waste is more complex, because of its extremely heterogeneous composition, consistency, biodegradability etc. In addition, physical properties of waste change over time, so the method of taking and selection of representative samples is problematic and has not yet been standardized. In ...
    ... and selection || > M @523331 the phase composition and physical indicators of iušLte008| Y Horanalysis| municipal waste. In addition, physical properties of •n žž% M:s| ; H n pj ii r waste change over time, both in depth and from · · O waste- location to location, so the method of taking and O ...
    ... particles) and porosity between partcles. However, in this way 109 definition of phase composition as well as determination of mechanical properties of municipal waste is further complicated, because in the landfil can be found particles saturated inside with contacts between them dry and ...

  • Antioxidant and antimicrobial activity of some tetradentate Schiff bases and their Cu (II) complexes

    Aleksandar Mijatović, Milan Nikolić, Snežana Spasić, Aleksandra N. Žerađanin, Kristina Joksimović, Aleksandar Lolić, Rada Baošić (2020)
    Šifove baze i njihovi Cu(II) kompleksi su poznati po svojoj biološkoj aktivnosti. U ovom radu proučavana je antibakterijska aktivnost protiv gram-negativnih sojeva Escherichia coli, Pseudomonas aeruginosa i Staphilococcus piogenes, kao i Gram-pozitivnih Staphilococcus piogenes i Pseudomonas aeruginosa, zajedno sa antifungalnim dejstvom protiv Musperg strainilusa, A. Takođe, tehnički jednostavni i brzi testovi kao što su ABTS, HORAC i ORAC korišćeni su za ispitivanje antioksidativne aktivnosti kako bi se uporedili dobijeni rezultati sa različitim tipovima testova. Uprkos tome što je princip ...

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Дефинисање механичких својстава алтерисаног стенског материјала лабораторијским методама

    Вељко М. Рупар (2022)
    Основни циљ овог рада је да представи методологију одређивања механичких својстава хетерогеног стенског масива који изграђују дацит (Д) и алтерисани дацит (АД), где је уочена је зона постепеног преласка од алтерисаног дацита до дацита. Механичка својства стенског масива у тој зони утврђена су на основу лабораторијских испитивања једноосне и троосне чврстоће на притисак стенског материјала композитних узорака. Композитни узорци су се састојали од дискова стенског материјала, при чему је висина дискова h дефинисала различити процентуални удео појединог стенског материјала, ...
    дацит, алтерисани дацит, једноосна чврстоћа на притисак, троосна чврстоћа на притисак, композитни узорци, механика стена, стабилност косина

  • The Newton method for solving nonlinear equations based on aggregation operators

    Nebojša M. Ralević, Dejan Ćebić (2019)

  • Hydraulic impact of pressure transients from water conveyance tunnel on the complex hydrogeological system: A case study HPP

    Igor Jemcov, Maja Todorović, Aleksandar Jemcov, Marina Ćuk Đurović (2024)
    Tunel pod pritiskom, Unutrašnji pijezometri, Tranzijenti pritiska, Karstna izdan, Pukotinska izdan, Hidraulički odziv
    ... key factor in this regard (Chen et al., 2023). Geological formations have a complex void system, that affects the hydraulic properties of fractured rocks. These properties can change due to engineering activities during construction and operation in many engineering practices (Zhou et al., 2023) ...
    ... pressure tunnel, creating two characteristic unsteady flow phenomena: water hammer – WH and water mass oscillation – WMO (Fig. 3). The elastic properties of Water lead to the appearance of a hydraulic transient – WH, in the zone of appearance of the high-pressure part of the tunnel and are related ...

  • 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 ...
    ... potential for carbon storage. Quantification of functional groups is interesting because chemical reactivity of biochar can have effect on soil properties. In this researh different samples of biochar are used and one as referent sample. Oxygen surface ‘groups were determinated by Boehm titration ...