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Упит dcterms_subject_txt:chemical mixture

105 items

  • 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
    ... appropriate acetylacetonate complexes necessary to obtain 0.013 mol of ferrite/titanate composite were used. The thermal decomposition of the mixture suspended in toluene was performed in an electrical furnace with a heating, rate of 10 "C/min at t = 500 SC for 1 h, followed by pulverization ...
    ... applications [35,41,42]. Although the increase in spinel content negatively affects magnetoelectric response [40], careful selection of ferrite chemical composition, as well as an attentive choice of synthesis protocol may serve to overcome such negative influence [43-45]. Many different methods ...
    ... BaTiOy /ZnFe>Ou, and BaTiOy / Nip ,s Znp,s Fe)Oa samples. 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 ...

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... temperature in DK-I-60-3 was around 314 ◦C, and similar results were obtained in the case of physical mixtures S6 and S8. The melting peak in physical mixture S5 was 2 ◦C lower, probably due to interactions between DK-I-60-3 and excipients, as their concentration was the highest in this formulation. The melting ...
    ... 11000 Belgrade, Serbia; danijela@nanosys.ihtm.bg.ac.rs * Correspondence: snezana.savic@pharmacy.bg.ac.rs Abstract: Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome ...
    ... - logical drugs led to the development of drug candidates with increased lipophilicity and high molecular weight. It is estimated that 90% of new chemical entities are poorly soluble, which is recognized as a major obstacle in drug development [1]. Because conventional for- mulations fail to meet re ...

  • Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia

    Fen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... SYNTHESIS AND CHARACTERIZATION OF SPHENE BASED CERAMICS Abstract Sphene (CaTiSiO5) was successfully obtained from a mixture of TiO2, SiO2 and CaCO3 using mehanochemical activation. This simple method proved to be suitable to get sphene ceramics. Theoretical density was ...
    ... процессов. Новосибирск: Издво Наука, Сибирское отдние. Avvakumov E., Senna M. and Kosova N. (2001) Soft Mechanochemical Synthesis: A Basis for New Chemical Technologies. Kluwer Academic Publishers, 207. Angel R.J. (1997) Transformation of fivefold-coordinated silicon to octahedral silicon in calcium ...
    ... Јелена Пантић 116 Beddow, J.K. (1980) Particulate science and technology. Chemical Pub. Co., New York. Benjamin J.S. (1992) Fundamentals of Mechanical Alloying. Mater Sci Forum 1: 88-90. Bismayer U., Schmahl W., Schmidt ...

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... SYNTHESIS AND CHARACTERIZATION OF SPHENE BASED CERAMICS Abstract Sphene (CaTiSiO5) was successfully obtained from a mixture of TiO2, SiO2 and CaCO3 using mehanochemical activation. This simple method proved to be suitable to get sphene ceramics. Theoretical density was ...
    ... процессов. Новосибирск: Издво Наука, Сибирское отдние. Avvakumov E., Senna M. and Kosova N. (2001) Soft Mechanochemical Synthesis: A Basis for New Chemical Technologies. Kluwer Academic Publishers, 207. Angel R.J. (1997) Transformation of fivefold-coordinated silicon to octahedral silicon in calcium ...
    ... Јелена Пантић 116 Beddow, J.K. (1980) Particulate science and technology. Chemical Pub. Co., New York. Benjamin J.S. (1992) Fundamentals of Mechanical Alloying. Mater Sci Forum 1: 88-90. Bismayer U., Schmahl W., Schmidt ...

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)

    N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero (2020)
    Paleontology,Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics,Oceanography

  • 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

  • Integrated Stratigraphy of the Middle–Upper Jurassic of the Krížna Nappe, Tatra Mountains

    Renata Jach, Nevenka Đerić, Špela Goričan, Daniela Reháková (2014)
    carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Krížna Nappe, West ern Carpathians, Tethys
    ... suggests that 8SC of bulk samples of micritic carbonates from carbonatc-biosilicecous deposits, containing only a small amount of carbonate ad- mixture (up to 12 wt% of CaCO;), can be used effectively in chemostratigraphic studies. Carbon-isotope stratigraphy The unique 815C isotope pattern in ...

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... Organic Pollutants in Serbia 269 Table 3. The 16 New POPs (UNEP 2017) Chemical Annex Source Alpha hexachlorocyclohexane A P Beta hexachlorocyclohexane A P Chlordecone A P Decabromodiphenyl ether (commercial mixture, c-cdecaBDE) A IP Hexabromobiphenyl A IP Hexabromocyclododecane A IP ...
    ... working as a professor of Inorganic Chemistry, Inorganic Chemical Technology, Technological Operations, and Ceramics and Glass Technology. Professor Milić's research interest has always been in the area of chemistry, chemical technology, and chemical engineering, and especially in electrochemistry, metal ...
    ... Metallurgy in Bor, Serbia, as an associate senior researcher at the Department of Chemical Technology. Professor Dimitrijević”s research interest has always been within a wide area of chemistry, chemical technology, and chemical engineering, with the main focus on leaching of metals and sulfides, mineral ...

  • Mineragenetske karakteristike i potencijalnostjuvelirskih mineralnih resursa leckog vulkanskog kompleksa

    Zoran Ž. Miladinović (2012-12-11)
    Jedan od najznačajnijih regiona u Srbiji, sa stanovišta potencijalnosti juvelirskih mneralnih resursa, predstavlja lecki vulkanski kompleks, tercijarne starosti i dominantno andezitskog sastava. Ovaj vulkanski kompleks površine preko 700km2 nalazi se u južnojSrbiji na prostoru imeđu Kuršumlije, Lebana i Medveđe.Prvi su pažnju na juvelirske mineralne sirovine ovog prostora obratili graditeljiJustinijane Prima-e (VI vek). Najintenzivnija istraživanja izvršena su u periodu 1980–1982. ali samo na malom prostoru krajnjeg jugoistočnog dela vulkanskog kompleksa.U Leckom vulkanskom kompleksu dominiraju andezitske stene i njihovi piroklastiti.Smatra se ...
    vulkanski kompleks, mineragenetske karakteristike, juvelirski mineralni resursi, nalazišta, potencijalnost, kvarc, ametist, ahat, kalcedon, jaspis, prognoza
    ... mineral composition of gemstone is mainly represented by quartz (low temperature α-quartz, chalcedony („length-fast“ and „length-slow“) and jasper (mixture of quartz and chalcedony). Numerous subvarieties (regarding colour and texture characeristics) of chalcedony (agate, carnelian, sard, black chalcedony ...
    ... and rock crystal) are present. A number of different laboratory analisys were used: optical mineralogical and petrological, X-Ray diffraction, chemical trace analisys (ICP-MS and ICP-OES), scaning electron microscopy (SEM), differential thermal analysis (DTA). Some gemmological analysis were also ...
    ... 133, 1998, p. 96-105. Götze J., Tichomirowa M., Fuchs H., Pilot J. Sharp D.Z., Geochemistry of agates: a trace element and stable isotope study, Chemical Geology 175, pp. 523–541, 2001. Graetsch H., Structural characteristics of opaline and microcrystalline silica minerals, Reviews in Mineralogy ...

  • Отпад из процеса сагоревања угља као сировина за добијање елемената ретких земаља

    Бојан Земљак (2024)
    Због великог броја индустрија у којима се користе ови ресурси, глобална економија се у великој мери ослања на елементе ретких земаља. Елементи ретких земаља су есенцијална сировина — материјал за развој савремених технологија, али у односу на њихову огромну потражњу, њихово вађење је ограничено и повезано је са значајним утицајима на животну средину. Због њихове ограничене доступности, проблема који се јављају при процесима експлоатације, све више и више земаља почиње да тражи повољније могућности вађења елемената [REE] из секундарних ...
    Елементи ретких земаља, резерве, употреба, представници и методе опоравка елемената ретких земаља
    ... Reynaud, G. and Crane, P., 2014. Honeymoon Mine Australia: commissioning and operation of the process plant using a novel solvent extraction reagent mixture in a high chloride environment. [101] SCHONEVELD, L.E., 2013. Genesis of the Central Zone of the Nolans Bore Rare Earth Element Deposit, Northern ...
    ... Metals 2021, 11, p.142. [25] Teterin, Y.A. and Teterin, A.Y., 2002. Structure of X-ray photoelectron spectra of lanthanide compounds. Russian Chemical Reviews, 71(5), p.347-381. [26] Oudet, X., 1989. Rare earth electronic configurations and 3d—— 4f transitions. In Annales de la Fondation Louis ...
    ... 1, 2, and 13) catalyzed hydroamination. Hydrofunctionalization, p.51-114. [33] Bunzli, J.C.G., 2000. Lanthanides. Kirk-Othmer Encyclopedia of Chemical Technology, p.1-43. [34] Kelly, R.P., 2013.Advances in the organometallic and organoamidometallic chemistry of the lanthanoids and alkaline ...

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • 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
    ... methylene blue on fused quartz. Chemical Physics Letters 349: 376 - 382 Kobayashi M., Tokunaga H., Okubo J., Hoshi T. and Tanizaki Y. 1988. Measurements of the polarized ATR spectra for adsorbed dye layers by using a stack of thin glass plates. Bulletin of the Chemical Society of Japan 61: 4171 - ...
    ... Society Glossary of Clay Science. The Clay Minerals Society, Chantilly, VA. Crowley J.K. and Vergo N. 1988. Near infrared reflectance spectra of mixture of kaolin-group minerals: use in clay minerals studies. Clays & Clay Miner. 36 (4): 310 - 316 https://en.wikipedia.org/wiki/International_Co ...
    ... blue (MB). Mineralogical characterisation of investigated clays and their interactions with MB solutions where determined using optical, XRD, chemical, DTA and spectrophotometric methods. The type of the MB aggregation on the clay particles enabled distinguishing of two types of clay minerals: ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... mechanisms of groundwater recharge; groundwater mean residence . time and groundwater age; interconnections between surface and groundwater and mixture of water from different aquifers using isotopic and hydrochemical characteristics of water. She achieved her scientific and professional skills ...
    ... Mangan (Mn), Amonijak (NHa), Nitrite (NO). Uređaji za ispitivanje fizičko-hemijskih parametara vode na terenu Devices for measurements of physico-chemical parameters of water in situ Specijalna istraživanja koja izvodi CHK Poseban segment CHK-a čine specijalna – speleološka istraživanja (jame i ...
    ... standards and other supporting equipment). In-situ water quality monitoring The CKH is equipped with modern devices for testing the physico-chemical parameters of water directly in the field. CKH has devices for measuring: T (*C), pH, Turbidity (NTU), EFlectrical conductivity (HS/cm), Redox ...

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... of the petrochemical and chemical industries and the sphere of energy sources of today. Fischer-Tropsch synthesis is a key measure of harnessing existing resources, primarily synthesis gas, to produce alternative hydrocarbon fuels, a series of petrochemicals and chemical products. Fischer-Tropsch ...
    ... process. USA: Speight, J.G. [3] De Klerk, A. (2013). Kirk – Othmer Encyclopedia of Chemical Technology. Chapter: The Fischer-Tropsch process. Weinheim: Wiley-VCH. [4] Martin, M.M. (2017). Industrial chemical process analysis and design. Elsevier Ltd. [5] Xu, R. (2013). Introduction to Fisc ...
    ... consequences for material goods and human lives. The gas detection system monitors the most likely source of uncontrolled discharge of gas, steam or mixture (pipelines, tanks, gas boilers rooms, etc.) and activates alarms or protective devices to prevent the ignition of uncontrolled leaked gas, vapors ...

  • Концепт расположивости при дефинисању ефикасног одржавања помоћне механизације на површинским коповима

    Radiša D. Đurić (2016-05-30)
    Оцена расположивости представља основну компоненту уинжењерском управљању опремом. Расположивост је свеобухватни концепткоји представља меру употребног квалитета техничких система, који садржичитаву серију парцијалних индикатора који се односе на време у раду ивреме у отказу система као и на његову функционалну погодност. Овадисертација даје структурну анализу парцијалних индикатора као и развојмодела њихове синтезе на ниво расположивости. Поменути подаци имајухибридни карактер (измерени и експертски добијени) и њихова интеграцијаи синтеза је остварена коришћењем фази пропозиције и фази закључивања.Овакав приступ омогућава оцену техничког система ...
    управљање опремом, инжењерство одржавања,расположивост, фази закључивање, прикупљање података, булдозер
    ... Wood, R.J.K., Wang, L., Callan, R., Powrie, H.E.G., 2008. Wear detection of rolling element bearings using multiple-sensing technologies and mixture-model-based clustering method. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability; 222: 207-218, http://dx ...

  • Природни потенцијал минералних вода Србије - Natural potential of mineral waters in Serbia

    Оливера Крунић (2021)
    минералне воде