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Упит dcterms_subject_txt:crystal structure

445 items

  • Novi pristup proučavanju tekstura minerala značajnih za istraživanje rudnih ležišta

    Aleksandar Pačevski (2022)
    ... determined by the microprobe analysis methods of a mineral composition (EMPA and LA-ICP-MS). However, using the microprobe analysis methods of a crystal structure of mineral, such as micro-Raman spectroscopy and TEM analysis with prior sample preparation by Focused Ion Beam (FIB), it was found that only ...

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... org/IFKAD 802 The language support system, whose structure is outlined in Figure 3, is based on electronic language resources, namely, lexical resources, textual resources and grammars. Bilingual dictionaries ...
    ... at FMG within the GeolISS project.6 Thesauruses are complex terminological resources, usually related to a specific domain, with as semantic structure formed by semantic relations between terms, and thus in some of their features resembling wordnets. RudOnto is another complex terminological ...

  • Петрологија црвених пешчара источне Србијe

    Андреј Марковић (2024)
    У источној Србији формација црвених пешчара има велико распрострањење и улази у састав многих планина овог дела наше земље. Формацију чине кластичне стене интензивно црвене боје псамитске, ређе псамитско-псефитске структуре и алевритске структуре. Ове стене леже трансгресивно преко старијих пермо-карбонских и карбонских стена, док навише прелазе у доњотријаске седименте. Формација црвених пешчара захвата два појаса унутар Карпато-балканида – унутрашњи и средишњи део. Узорци анализирани у овом раду део су средишњег појаса. Тема завршног рада је петрологија црвених пешчара источне ...
    источна Србија, црвени пешчар, петролошко-минералошке карактеристике, аркозе
    ... this part of our country. This formation consists of intensely red-colored clastic rocks, psammitic, rarely psammite-psephitic and siltstone structure. These rocks lie transgressively above older Permo-Carboniferous and Carboniferous rocks while upwards they pass into the Lower Triassic sediments ...
    ... binders. According to size, degree of roundness and sorting, they are determined as fine-grained medium-sorted sandstones-siltstone- psammitic structure. The binder is calcite cement and clayey-ferrous matrix. The color of the rocks is distinctly red conditioned by presence of iron minerals. Key ...

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • ‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions

    Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban (2020)
    Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...
    Firing, Glaze, Traditional ceramics, Provenance studies, Augite

  • Callovian (Middle Jurassic) Sphriganaria (Brachiopoda) from the Jordan Valley (Middle East)

    Howard R. Feldman, Barbara V. Radulović, Fayez Ahmad (2023)
    Brachiopods, Middle Jurassic, Sphriganaria, shell microstructure, Ethiopian Province

  • Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series

    Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)
    Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...
    deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija
    ... where Lsum = ∑M i=1 Li. Note also that the structure of the matrix YVYT V , is as follows: YVYT V =  Y(1)Y(1)T Y(1)Y(2)T · · · Y(1)Y(M)T Y(2)Y(1)T Y(2)Y(2)T · · · Y(2)Y(M)T ... ... . . . ... Y(3)Y(1)T Y(3)Y(2)T · · · Y(3)Y(M)T , (7) The structure of the matrix YVYT V is similar to the ...
    ... Lsum = yM , Li. Note also that the structure of the matrix Yy YJ, is as follows: » as the eigen- values of YyYJ, arranged in decreasing order ay, 2 ...Ay. yYOyQT yQAy@ro... yA)y(M)T YAyQT yy2T ... y2)y(M)T Wy = . Dok . (7) yYOYUT y@yQT ... y@)y(Myr The structure of the matrix wy is similar to the ...

  • Structural and geochronological constraints from the Drina-Ivanjica thrust sheet (Western Serbia): implications for the Cretaceous–Paleogene tectonics of the Internal Dinarides

    Kristof Porkoláb, Szilvia Kövér, Zsolt Benkó, Gabor Héja, Melinda Fialowski, Balázs Soós, Nataša Gerzina Spajić, Nevenka Đerić, László Fodor (2019)
    Internal Dinarides, Drina-Ivanjica thrust sheet, Deformation history, K–Ar dating, Obduction, Structural analysis
    ... nal evolution of the area. Distinction between metamorphic and non-metamorphic units as well as units which have or have not been affected by crystal plastic deformation allows the re-interpretation of the ori- gin of Triassic sequences outcropping necar the Paleozoic core of the Drina-Ivanjica ...
    ... an overview of the deformational structures is presented below in a relative chronological order. D, structures represent the only ductile (crystal plastic) structures found in the Paleozoic and in the Northern Tri- assic unit of the study area (Figs. 2, 3). Dynamic recrys- tallization of ...
    ... 6b) implies that the K/Ar ages become younger with a decrease of the KI values. The decrease in KI values means increase in the change of the crystal structures of the K-white mica min- erals, which is the result of increasing metamorphic degree. Based on IC measurements (Table 1) and microstructural ...

  • Testing the energy value of different types of coal by the method of active thermography

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2020)
    In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...
    Infrared imaging, nondestructive testing, active thermography, coal.

  • Sinteza i strukturna karakterizacija mikroporoznih arsenata i fosfata

    Sabina Z. Kovač (2015-09-28)
    Predmet rada i istraživanja ove doktorske disertacije su sinteza i strukturnekarakteristike novih kristalnih arsenata i fosfata koji sadrže Mg, K, Ca, Mn, Fe, Co, Ni,Cu, Zn, Sr, Ba i druge katjone. U strukturama arsenata i fosfata, AsO4- i PO4-tetraedrinajčešće se vezuju sa tetraedarski ili oktaedarski koordinisanim katjonima prelaznihmetala formirajući otvorene strukture (slojeve ili 3D mreže) sa širokim opsegomrazličitih topologija. U šupljinama ili porama u obliku povezanih ili nepovezanihkanala, tunela, kaveza i međuslojnog prostora mogu se ugraditi različiti vanmrežni joni(obično ...
    hidrotermalna sinteza, mikroporozna jedinjenja, arsenati, fosfati,rendgenska strukturna analiza
    ... protonated forms. The quality of the obtained single crystals was evaluated using an optical or binocular microscope, and the crystal structure was solved using single-crystal X-ray diffraction data. For the morphological and chemical characterization the scanning electron microscopy (SEM), coupled ...
    ... sulfides and a preliminary table of sulfide crystal radii. In Structure and Bonding in Crystals 2 (M. O’Keeffe & A. Navrotsky, eds.), Academic Press, New York, N.Y. (53–70). 143. Sheldrick, G. M. (1997). SHELXL97. Program for the Refinement of Crystal Structures. University of Göttingen, Germany ...
    ... synthesis and crystal structure of microporous (H3NCH2CH2NH3)(ZnPO4)2, XVIII konferencija SKD, Andrevlje, 2‒4. jun 2011. (Izvodi radova, str 58‒59), poster – nagrada za najbolji poster XVIII konferencije SKD. 12. Šutović, S., Đorđević, T., Karanović, Lj., Tsumcorite – like structure of arsenate ...

  • 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

  • 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

  • Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer

    Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)
    ... Distribution and Use Systematic geological research in this region began at the end of the nineteenth century. The first data about the geological structure date came from the drilling of artesian wells. Later on, systematic searches for oil reserves resulted in numerous studies and maps reconslructing ...

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... mechanism, diffusion through the surface layer (McIntire 1963; Smith et al. 2004). Parti tio- ning controlled by bulk crystal chemistry would be expected to occur during slow crystal growth, with the fluid chemistry buffered by the pre-existing local mineral/rock assemblage (Smith et al. 2004). Oscillatory ...
    ... several attempts were made for garnet. Despite their highly variable composition due to a number of substitutions that may take place in the structure, garnet beco- mes a suitable geochemical tracer. Such application is suppor- ted by its common presence in skarn deposits and its high physical ...
    ... calcite could be noticed. Skarns occur as small-scale bodies up to a few metres thick. Their texture is either granoblastic or nematoblastic, and structure is massive, rarely banded. The selected sample for detailed ana lyses contains calcite + garnet + epidote + chlorite + quartz (Fig. 2). Garnets ...

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... with modified outcome through ranking was proposed. The indicator structure is shown in Figure 1, and it is used to define the level of energy security in the two stages of the analysis, for a certain energy scenario. The indicator structure is thus created to be an operational, decoupling, but also complete ...
    ... the accompanying effect of the use of natural gas on other energy products, i.e., the structure of energy use and energy efficiency measures. Natural gas appliances are more efficient, characterized by compact structure, lower costs of exploitation and low investment costs. Usage of natural gas also impacts ...
    ... synthesis model for evaluation of energy security assessment of energy development scenarios is explained in detail in this section. 2.1. Indicator Structure An integral analysis of the energy security of the natural gas sector of the Republic of Serbia was carried out by developing a mathematical model ...

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... cycle is performed until the optimization criterion is met (Shopova and Vaklieva-Banacheva, 2006). A typical genetic algorithm has the following structure: Optimisation of underground mine decline ... 37 1 ...

  • Why classical sequence stratigraphy doesn't work in Pannonian basin?

    Dejan Radivojević (2018)
    basen iza ostrvskog luka, detačment, miocen, Panonski basen, riftogeneza, sekvenciona stratigrafija
    ...  Memoir 57, 545 pp  Matenco, L., Radivojević, D., 2012. On the formation and evolution of the Pannonian Basin: Constraints  derived  from  the  structure  of  the  junction  area  between  the  Carpathians  and  Dinarides,  Tectonics 31(6), TC6007.  Nottvedt, A. R.H. Gabrielsen, and R.J. Steel, 1995 ...

  • Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...
    Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatori

  • Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils

    Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)
    MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii
    ... nutrient medium rich in Urea (Figure 2). The crystal forms (marked with red arrows in Figure 2) were observed as reflected solid structures of each colony, but with different positions relative to the colony center. Furthermore, the shape and size of crystal Microorganisms 2021, 9, 1691 7 of 20 forms ...
    ... 775 and 0.726, respectively. The greater standard score for bacterial isolates was reached because these five bacteria were effective in inducing crystal formation on nutrient media with and without Urea, while referent strains induced precipitation on only one type of media. This suggests that referent ...
    ... pseudofirmus DSM 8715. Figure 2. Optical microscopy of bacterial colonies on Urea-CaCl2 agar (400 × magnifications; scale bar 2 mm; red arrow indicated crystal formation with different positions relative to the colony center). 3.2. Bacterial Strain Identification The five bacterial isolates (previously named ...