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Упит dcterms_subject_txt:space group

380 items

  • Sitni, ali bitni: uloga sitnih sisara, herpetofaune i mekušaca u rekonstrukciji pleistocenskih paleosredina

    Katarina Bogićević, Draženko Nenadić, Dragana Đurić, Mihajlo Jovanović, Aleksandra Savković (2023)
    Fosilni ostaci životinja i biljaka imaju važnu ulogu u rekonstrukciji pleistocenskih paleosredina. U ovom radu opisan je značaj tri grupe životinja: sitnih sisara, herpetofaune I mekušaca. Mada je za rekonstrukciju važan sastav čitave asocijacije, nalasci pojedinih vrsta mogu biti dovoljno indikativni da otkriju tip staništa ili klimatske uslove. Posebnu teškoću pri rekonstrukciji paleosredina u Srbiji predstavlja činjenica da klimatske promene na Balkanskom poluostrvu nisu bile tako oštre kao u srednjoj i zapadnoj Evropi, pa ne postoji drastična razlika u ...
    ... type reconstruction is the method of ecological groups. For each species, it is determined in which group of habitats it most often lives today, and then the percentage representation of each group in the entire fauna is calculated. One of the variants is the TH- index method, where the affinity ...

  • Is the Sava-Vardar zone a remnant of an Upper Cretaceous ocen? Pro et contra

    Vladica Cvetković, Dejan Prelević, Ana Mladenović (2024)
    Neotethys, ocean closure, subduction
    ... of them world- scale, porphyry Cu and epithermal Au-Cu ore deposits. These features are commonly found in modern subduction environments. Both group of statements corroborate the hypothesis that after a major convergence and obduction of Balkan ophiolites in the latest Jurassic, a Neotethyan ...

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike
    ... Some reflections indicate a doubled b-axis (~8 instead of ~4 Å) and a reduction of symmetry from the usual orthorhombic Pnma space group to the mono- clinic P21/c space group, caused by a certain degree of ordered distribution of Pb and Bi over the mixed octahedral sites. This ordering process has ...
    ... Innsbruck, Innrain 52, 6020 Innsbruck, Austria ABSTRACT The crystal structure of cosalite from the Trepča orefield was refined in the orthorhombic space group Pnma [a¼ 23.7878 (9), b¼4.0566 (3), c¼ 19.1026 (8) Å, V¼1843.35 (17) Å3, Z¼2] from single-crystal data (MoKa X-ray diffraction, CCD area detector) ...
    ... described in some other complex sulfides (Berlepsch et al. 2001b, Bindi et al. 2017 and references therein). The refinement in the monoclinic space group was unstable and the differences in bond lengths between different Me–S sites were not significant, suggesting that the Pb and Bi atoms are only ...

  • Late Triassic radiolarians from the Grivska formation, internal Dinarides, SW Serbia

    Nikita Bragin, Liubov Bragina, Nevenka Đerić, Nataša Gerzina-Spajić (2019)
    Paleontology, Stratigraphy, Economic Geology, Geochemistry and Petrology, Geology, Geophysics, Geotechnical Engineering and Engineering Geology
    ... different sedimentary successions, MISssoNI et al. (2012) restrict the name Grivska to Triassic hemipe- lagic sequences and advocate the term Grivska Group, which comprises different Middle and Late Triassic hemipelagic bedded cherty limestones with layers of calciturbidites with shallow-water debris ...
    ... GAWLICK et al. (2017) offered definitions and emendations of some for- mations in the Inner Dinar- ides, including some parts of the Grivska Group. According to GAWLICK et al. (2017) the Grivska Formation is repre- sented by Upper Triassic (lo- wer Carnian - Rhaetian) cherty limestones ...

  • Digitalizacija u rudarstvu: Kreiranje sistema za efikasno poslovno izveštavanje

    Stevan Đenadić, Aleksandar Mirković, Veljko Rupar (2024)
    Proces donošenja odluka u oblasti rudarstva i geologije uslovljen je blagovremenim posedovanjem kvalitetnih podataka i informacija. Kompleksnost rudarskih procesa nalaže prikupljanje podataka na dnevnom odnosno na smenskom nivou. Podaci kao takvi bez analitičkog pristupa nisu dovoljni. Kako bi pristup podacima bio brz i efikasan neophodno je posedovanje adekvatnog digitalnog rešenja uz adekvatne centralizovane baze podataka. U ovom radu je dat pregled trenutne pozicije rudarstva sa aspekta digitalne transformacije kao i predlog jednostavnog prototipa u obliku digitalnog sistema za poslovno ...
    rudarstvo, digitalna transformacija, baze podataka
    ... automatizacije procesa [2]. Prema Indeksu digitalne akceleracije (engl. Digital Acceleration Index, DAI) kompanije BCG (engl. Boston Consulting Group) navodi da je industrija metala i rudarstva digitalno 30-40% manje razvijena u poređenju sa drugim sličnim industrijama [3]. Generalno posmatrano ...
    ... itemId=/content/component/b9ed6f5e-en [3] Ganerwalla, A. & Harnathka, S. (2021). Racing Toward a Digital Future in Metals and Mining. Boston Consulting Group. available on: https://www.bcg.com/publications/2021/adopting-a-digital-strategy-in- the-metals-and-mining-industry [4] Stolterman, E. & Fors, A ...

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе

  • Integrisano okruženje za pripremu paralelizovanog korpusa

    Ivan Obradović, Ranka Stanković, Miloš Utvić (2007)
    Razvoj paralelizovanih korpusa zahteva pripremu paralelnih tekstova za njihovu integraciju u paralelizovani korpus. Reč je o jednom kompleksnom zadatku koji se može rešiti na različite načine, i koji mora da se odvija u nekoliko koraka. U ovom radu najpre je iznet postupak pripreme paralelnih tekstova za paralelizovani korpus koji se koristi u Grupi za jezičke tehnologije Univerziteta u Beogradu. Potom je dat kratak pregled programa (XAlign, Concordancier, WS4LR), odnosno softverskih alata koji se pri tome koriste. Nedostatak udobnog okruženja ...

  • Part of Speech Tagging for Serbian language using Natural Language Toolkit

    Ranka Stanković, Boro Milovanović (2020)
    Dok se razvijaju složeni algoritmi za NLP (obrada prirodnog jezika), osnovni zadaci kao što je označavanje ostaju veoma važni i još uvek izazovni. NLTK (Natural Language Toolkit) je moćna Python biblioteka za razvoj programa zasnovanih na NLP-u. Pokušavamo da iskoristimo ovu biblioteku za kreiranje PoS (vrsta reči) oznake za savremeni srpski jezik. Jedanaest različitih modela je kreirano korišćenjem NLTK API-ja za označavanje. Najbolji modeli se transformišu sa Brill tagerom da bi se poboljšala tačnost. Obučili smo modele na označenom ...
    obrada prirodnog jezika, mašinsko učenje, neuronske mreže

  • 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

  • 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 ...

  • 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
    ... used to develop magnetoelectric muhltiferroic materials. This is due to its unique dielectric properties in the tetragonal phase with the P4mm space group [30-—33]. In order to design novel multiferroic composites based on barium titanate, ferrites are one of the ideal candidates due to their attractive ...
    ... e-like phases were formed. However, spinel and tetragonal BaTiOs phases remain unchanged. The transformation of BaTiOs from P4Amm to P4/mmm space group Was observed at 1300 ?C in all studied cases. Inorganics 2023, 11, 51 3of 19 as-prepared In te ns it y [A rb . un it s] In te ns it ...
    ... 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 calculated by the RIR method. Samples Phase ...

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... 50. 1–2 — 7iubospongopallium sp.; 3 — Triassoastrum sp.; 4 — Monocapnuchosphaera sp.. 5 — Capnuchosphaera sp., 61 — Capnodoce crystallina Pessagno group; 8 — Capnodoce sp. cf. C. crystallina Pessagno; 9 — Capnodoce anapetes De Wever; 10 — Poulpus sp. cf. P. piabyx De Wever, 11 — Crucella tenuis Tekin; ...
    ... organisms are missing. The following taxa were deter- mined (Fig. 6): Canesium sp., Canoptum? sp., Capnodoce anapetes De Wever, C. crystallina Pessagno group, Capnucho- sphaera sp., Corum regium Blome, C. sp. cf. C. regium Blome, C. sp. cf. C. speciosum Blome, Crucella tenuis Tekin, Japono- campe sp ...
    ... Capnuchosphaera theloides De Wever; 5 — Capnuchosphaera sp. cf. C. triassica De Wever; 6 — Capnuchosphaera sp.; 7–8 — Capnodoce crystallina Pessagno group; 9 — Poulpus sp. cf. P. piabyx De Wever; 10 — Praeprotunuma sp. cf. P. antiqua Tekin; 11 — Spinosicapsa sp. cf. S. yazgani (Tekin); 12 — Pachus ...

  • Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

    Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)
    Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...
    Geochemistry and Petrology
    ... identical, with a charac- teristic fragment at m/z 146 originating from cleavage of ring B at the benzylic carbons and m/z 227 from loss of the isopropyl group. The Norra Albert samples contain an additional unidentified compound (U1) eluting slightly later on GC than cis- dehydroicetexane (Fig. 3) and only ...
    ... icetexanes. One of them (U2) is clearly visible in Fig. 3. They probably all have a seven carbon B-ring, like the dehydroicetex- anes, but the isopropyl group could be attached to other carbons in the aromatic ring. Two unidentified isomers of dehydroabietane and dehydroice- texane (U3 and U4), having similar ...
    ... with important fragments at m/z 270, 255 and 227 shifted to 256, 241 and 213, indicating loss of methyl from ring A and the presence of an isopropyl-group in the aromatic ring. However, clean mass spectra were not obtained for any of them. 3.4. Dehydroicetexanes in sediments and crude oils Dehydroicetexanes ...

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes
    ... collapse of the burned structure, a new layer of sediment is laid by the prehistoric inhabitants for the purpose of leveling the area and creating a clear space for new houses. The origin of the “fresh” sediment was presumed to be taken from the imminent environment of the set- tlement simply because logistics ...
    ... and V6. Lowest concentrations are found in the paleosol layer, as formerly suggested by mineralogy data. 4.4. Maceral analysis Liptinite maceral group prevails in sediment samples V1, V2, V6, and V10. In samples V3 and V4, huminite macerals dominate, while in samples V5, V7, V8, and V10 huminite prevail ...
    ... over liptinite macerals. Textinite, remains of well-preserved woody tissue, is present in high amount in the sample V4. Resinite, maceral of liptinite group, is the most abundant in the sample V6. Inertinite macerals are present in a variable amount in all studied samples. Photomicrographs of typical macerals ...

  • Mineralogy, chemistry, and distribution of selected trace elements in coal and shale from the Ibar Basin (South Serbia)

    Željana Novković, Nenad Nikolić, Nevena Andrić-Tomašević, Violeta Gajić, Mercedes Suárez, Emilia García-Romero, Vladimir Simić, Dragana Životić (2024)
    Ibarski basen, kameni ugalj, glinci, mineralogija, elementi u tragovima

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... first group rTefers to the work of the CKH's members in commercial scientific research projects both in Serbia and the region and abroad. The projects, which are financed by government institutions and defined as projects of national importance belong to the second group. The third group of projects ...
    ... 9781138029682, Taylor & Francis group, pp. 71-86 . Milanović, S. (2016): 3D Spatial modelling of karst channels-The Beljanica karst massif, Karst without Boundaries, edt. Z. Stevanović, N. Krešić, N. Kukurić, CRC Press/Balkema, ISBN 9781138029682, Taylor & Francis group, pp.169– 188 . Milanović, S ...
    ... CRC Press/Balkema, ISBN 9781138029682, Taylor & fFrancis group, pp. 321-336 . Stevanović, Z., Kresic, N. and Kukuric, N. (2016): (Eds.): Karst without boundaries, IAH Selected Papers edition, 376 pp. CRC Press, Taylor & Francis Group . Milanović, S. (2015): Choosing Optimal Dam Sites and Preventing ...

  • History of meteorite donations to the Collection of Minerals and Rocks of the University of Belgrade, Faculty of Mining and Geology (Serbia)

    Alena Zdravković, Maja Milošević, Kristina Šarić, Ivana Jelić, Ana Černok (2021)

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

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)

  • E-Connecting Balkan Languages

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Svetla Koeva (2009)
    In this paper we present a versatile language processing tool that can be successfully used for many Balkan languages. This tool relies for its work on several sophisticated textual and lexical resources that were developed for most of Balkan languages. These resources are based on several de facto standards in natural language processing.
    Query expansion, e-dictionary, wordnet, proper name, aligned text