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Упит dcterms_subject_txt:Natural two dimensional materials

747 items

  • Size–strain line-broadening analysis of anatase/brookite (TiO<sub>2</sub>)-based nanocomposites with carbon (C): XRPD and Raman spectroscopic analysis

    Aleksandar Kremenović, Mirjana Grujić-Brojčin, Nataša Tomić, Vladimir Lazović, Danica Bajuk-Bogdanović, Jugoslav Krstić, Maja Šćepanović (2022)
    A size-strain line-broadening analysis of the XRPD patterns and Raman spectra for two anatase/brookite (TiO2)-based nanocomposites with carbon (C) was carried out and the results compared with those of a similar sample free of carbon. The crystal structures and microstructures of anatase and brookite, as well as their relative abundance ratio, have been refined from XRPD data by the Rietveld method (the low amount of carbon is neglected). The XRPD size-strain analysis resulted in reliable structure and microstructure results ...
    Materials Chemistry, Metals and Alloys, Atomic and Molecular Physics, Optics, Electronic, Optical and Magnetic Materials

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... course content, goals, outcome, as well as the basic course materials, and dynamic data – information on all important events during the course: results of test and activities, various announcements, additional course materials added by teachers, etc. In the initial phase of portal development ...
    ... for a forthcoming instruction class, download course materials or get informed about their test and exam results, date and time of forthcoming tests and exams, etc., without being physically present in the FMG building. Course materials available on the portal to date cover approximately ...
    ... development the basic data for all courses were imported from the accreditation materials prepared for the accreditation process FMG underwent shortly before that. An example of these basic data is given in Figure 1 which depicts a portal page with basic information for the course Informatics ...

  • 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
    ... mining and geology, Department of Geotechnics, 458 (in Serbian). 10) Rakić D., Čaki L., Ćorić, S. (2013): Shear strength of municipal waste materials from two landfills in Serbia, Coupled Phenomena in Environmental Geotechnics (CPEG) — from theoretical and experimental research to practical a ...
    ... similar to paste (Machado et al., 2008). Within the fibrous phase, authors have included plastic materials, textile and other similar materials. Thus defined four-phase system divides solid materials by type and shape but does not take into account their temporal variability. A different proposition ...
    ... organic (o), liquid (v) and gaseous (a) phase (Figure 3). Inert phase consists of non-degradable materials such as plastic, metal, rock pieces, ceramics, glass and similar materials. All other materials would be in organic phase. This four-phase representation of municipal waste phase composition ...

  • Structural features of two novel alluaudite-like arsenates Cd1.16Zn2.34(AsO4)1.5(HAsO4)(H2AsO4)0.5 and Cd0.74Mg2.76(AsO4)1.5(HAsO4)(H2AsO4)0.5

    Stojanović Jovica, Đorđević Tamara, Karanović Ljiljana (2012)

  • 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

  • Novel cerium and praseodymium doped phosphate tungsten bronzes: Synthesis, characterization, the behavior in the Briggs-Rauscher reaction and photoluminescence properties

    Tijana Maksimović, Pavle Tančić, Jelena Maksimović, Dimitrije Mara, Marija Ilić, Rik Van Deun, Ljubinka Joksović, Maja Pagnacco (2023)
    Due to the interesting and potentially useful properties, phosphate tungsten bronzes are constantly being studied and attract a lot of attention. In the present work, two different metallic elements, belonging to the group of rare-earth metals, cerium and praseodymium, were used as a dopants for phosphate tungsten bronzes. Novel cerium and praseodymium doped phosphate tungsten bronzes were successfully synthesized and further characterized by thermal analyses, Fourier-transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy with energy-dispersive X-ray spectrometer and ...
    Electrical and Electronic Engineering, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic Materials, Inorganic Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Spectroscopy

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... collection. Smooth shells represent only approximately 10% of the collection. The aforementioned circumstances make it possible to measure the dimensional parameters of the shells on one dimension only and, on the ribbed shells, to count the number of ribs lying at the umbilicus and outside of the ...
    ... are not evident in the Serbian specimen. A related species, also in terms of size, is Hypo- lissoceras subtilior (Zittel, 1870). It differs in dimensional parame- ters, especially in the greater width of the umbilicus. Distribution. This species is probably known only from the Stramberk Limestone ...
    ... demonstrate that Ps. fasciculatus has denser ribs than Ps. lorioli because the ribs of the latter species have wider intercostal spaces. Among the dimensional parameters reported by Arkadiev and Bogdanova (2012), the lower H/D value differs somewhat from the Serbian specimen. Distribution. Jacobi Zone ...

  • Influence of Post-Synthesis Treatments on the Properties of Brushite/Monetite Powders

    Željko Radovanović, Lidija Radovanović, Aleksandar Kremenović, Đorđe Janaćković, Rada Petrović (2022)
    Dicalcium phosphate (DP) materials, of which brushite and monetite were the most known, have been intensively studied for several decades because of excellent resorptive and osteoconductive properties that can satisfy the requirements needed for various medical applications, such as bone cements, coatings of metallic implants and bone grafts ...

  • 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
    ... in multiferroism was strongly influenced by a scarcity of materials [1,2]. The discovery of extreme electric polarization behavior in BiFeOa and manganite muhltiferroic derivatives have accelerated research on this topic in the past two decades [3,4]. In the past few years, researchers have begun ...
    ... community has been focused on the development of advanced muhltifunctional composite materials. More specifically, the magnetoelectric coupling, is a consequence of the strain induced on the interface between two different Jnorganics 2023, 11, 51. https:/ /doi.org//10.3390/inorganics11020051 https:/ ...
    ... D.; Ksenevich, V.; Bychanok, D.; Selskis, A.; uzhir, P.; et al.: The Phosphate-Based Composite Materials Filled with Nano-Sized BaTiOy and Fes3Oux: Toward the Unfired Multiferroic Materials. Materials 2021, 14, 133. [CrossRef] [PubMed] Omelyanchik, A.; Antipova, V.; Gritsenko, C.; Kolesnikova, V ...

  • A Tel Platform Blending Academic And Entrepreneurial Knowledge

    Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović (2013)
    ... enables the publishing of learning materials in various languages. Keywords: Technology enhanced learning, e-Learning, Open courseware, Open educational resources 1. INTRODUCTION It is safe to say that in the majority of engineering disciplines two major sources of knowledge exist. One ...
    ... blending knowledge from the two sources, academic and entrepreneurial, within BAEKTEL, a platform founded on OER principles. Namely, BAEKTEL enables higher education institutions to publish various academic learning resources (video lectures, course planning materials and evaluation tools as ...
    ... tutors, virtual learning communities, and learning management systems (LMS) — have enabled further advances in the sharing of educational ideas, materials, and knowledge" [2]. The idea and practice of offering free educational resources in the form of courses through the Internet in the form ...

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... University of Belgrade, Serbia 7 Conference of The Serbian Society for Ceramic Materials preliminary Q-band measurement indicates that this spectrum is a superimposition of the spectra of VO ions located in two different positions in the KGa-l structure). A sharp intense peak near g = 2.002 ...
    ... Serbian Society for Ceramic Materials The Serbian Society for Ceramic Materials Institute for Multidisciplinary Research, University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions ...
    ... Ceramic Materials Committees Organizer The Serbian Society for Ceramic Materials Institute for Multidisciplinary Research (IMSI), University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use ...

  • 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

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... platform. edX-BAEKTEL platform contains two main components. The first one is a portal aimed for course enrolment and usage of course materials, and the second (edX Studio) is a backend control panel for creating and updating published materials [5]. edX Studio allows creating and combining ...
    ... idea of implementing OER materials in higher education is still new. This paper presents a pioneer project in this area, creation of OER course “Preparation for entry exam”, using the edX platform. The course “Preparation for entry exam” is aimed at presenting course materials to help freshmen prepare ...
    ... edX-BAEKTEL platform1 (Image 1). We believe this is a suitable way for making preparation materials accessible to a larger community of potential students. Such a course allows them to access free and open materials anytime from anywhere. The course contains the following sections: Courseware, Course ...

  • 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
    ... and altered dacite and the transition zone between these two rock materials. Based on the dependence of the constant mi and the altered dacite (AD%) volumetric participation (Figure 17), the overall interval of the mi value can be divided into two intervals. The first interval includes values for 0% to ...
    ... = 26 ± 6. The overall interval of constant mi values refers to dacite and altered dacite and the transition zone between these two rock materials and can be divided into two intervals. Namely, for the first interval (0% to 30% of AD), it is possible to define the value of the constant mi = 28 ± 3, which ...
    ... Suggested Methods for Determining the Uniaxial Compressive Strength and Deformability of Rock Materials. Int. J. Rock Mech. Min. Sci. 1979, 16, 135–140. 19. Suggested methods for determining the strength of rock materials in triaxial compression. Int. J. Rock Mech. Min. Sci. Géoméch. Abstr. 1978, 15, 47–51 ...

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... growing number and availability of learning materials, had a strong impact on changes in learning environments. New learning environments are needed, requiring appropriate technology to facilitate access to and management of learning materials in specific domains. Bearing this in mind, d ...
    ... considerably, as mathematical materials in Serbian are available in different formats, alphabets and dialects. Besides coping with different ways of writing mathematical formulae, one of the main challenges in obtaining a searchable format of these materials is the conversion of source files ...
    ... to corpus processing results from the use of two alphabets: Latin and Cyrillic, with different coding schemas and formats of source texts, as well as from various ways of expressing mathematical content. In order to resolve the problem of two alphabets, the entire corpus is transliterated ...

  • Applicability of the risk ranking methodology designed for water reservoirs to tailings storage facilities

    Dragana Nišić, Dinko Knežević, Aleksandar Cvjetić, Neda Nišić, Vladimir Jovanović (2022)
    The risks associated with operating water reservoirs and tailings storage facilities (TSFs) are different because of their different purposes, methods of construction and operation, and characteristics of the materials impounded and their flow behaviour. Regardless of the differences, these two types of structures are often put in the same category when it comes to risk assessment and the application of relevant methodologies, which may result in unrealistic outcomes. In this paper we investigate whether it is possible to apply ...
    procena rizika, akumulacije za vodu, jalovište, TSF, ICOLD, FMEA

  • Chemo-probe into the mantle origin of the NW Anatolia Eocene to Miocene volcanic rocks: Implications for the role of, crustal accretion, subduction, slab roll-back and slab break-off processes in genesis of post-collisional magmatism

    E. Yalçın Ersoy, Martin R. Palmer, Ş. Can Genç, Dejan Prelević, Cüneyt Akal, İbrahim Uysal (2017)
    Post-collisional Cenozoic magmatic activity in NW Anatolia produced widespread volcanism across the region. In the Biga Peninsula, in the west, medium-K calc-alkaline to ultra-K rocks with orogenic geochemical signature were emplaced at ~43–15 Ma (Biga orogenic volcanic rocks; BOVR). Volcanic activity in the Central Sakarya region, to the east, is mainly restricted to ~53–38Ma, but also continued during the Early Miocene with small basaltic extrusives (Sakarya orogenic volcanic rocks; SOVR). This study presents a new set of geochemical data ...

  • 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

  • Advantages and Disadvantages of a Parallel and Zigzag Method of Acquisition in Walking Mode in Magnetometric Archeological Research

    Mirko Petković, Vesna Cvetkov, Branislav Sretenović (2014)
    магнетометријска испитивања, цик-цак и паралелна аквизиција у ходајућем моду, линеарне аномалије, археологија
    ... ARCHAEOLOGY. INTRODUCTION The diff erences in the physical properties of the subsurface materials are the basic prerequisite for the application of geophysical methods to be successful. The use of iron-based materials during human history allows for the successful application of magnetometry, which is ...
    ... vantage of this instrument is its ability to measure the gradient of Total Magnetic Intensity (TMI), which is achieved by using two identical probes. By measuring TMI on two coupled probes in the same time interval, allows the avoidance of varia- tions of TMI in the base survey. Also, another important ...
    ... traverse, an er- ror of 2m can be regarded as a common error for each traverse. In the case when the distance be- tween two adjacent profi les is 1 m (in archaeology the distance between two adjacent profi les is often less than 1m), this error can result in the complete fl ecking of the anomalies, such ...