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Упит dcterms_subject_txt:Metals and Alloys

2334 items

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... 99.9 % trace metals basis) and La2(CO3)2 (Sigma- Aldrich, 99.9% trace metals basis, ≤ 1500.0 ppm Trace Rare Earth Analysis) were used for sequential extraction. The concentration of stock solution amounted to 2000 mg L-1, and working solutions used for determining sorption capacity and Freundlich adsorption ...
    ... greater quantities than in the earth’s crust and that are more cost effective than the earth’s resource.7, 8 Ionic radiuses of these elements are such that enable an easy replacement with alkaline and alkaline-earth metals, adsorbing at the surface9 and at the interlayer places of clay mineral. In ...
    ... ELEMENTS AND SOIL 3 As the source of lanthanum, erbium and gadolinium (III)– ions, their nitrate –hexahydrate salts (Sigma-Aldrich, 99.9 % trace metals basis, ≤1500.0 ppm Trace Rare Earth Analysis) were used for determining Freundlich adsorption isotherm, whereas as the source of neodymium and lanthanum ...

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)
    ... with keeping track of exploration and exploitation permits and works in the mineral resources field, and represents a basis for archiv- ing and efficient handling of vector, raster and related thematic alphanumeric content in one place, as well as efficient management and usage of mineral resources.8 Google ...
    ... archiving, query, retrieving, analysis and visualization of geologi- cal data. The development and implementation of GeolISS is managed by a team from the Faculty of Mining and Geology at the University of Belgrade (FMG) and funded by the Ministry of the Environment, Mining and Spatial Planning (MEMSP). The main ...
    ... archiving, query, retrieving, analysis and visualization of geological data. The development and implementa- tion of GeolISS is managed by a team from the Faculty of Mining and Geology at the University of Belgrade (FMG). Following the development of a geodatabase in ArcSDE and an ArcMap extension for data manage- ...

  • 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

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... OF SERBIA by Boban S. PAVLOVIĆ* and Dejan D. IVEZIĆ Faculty of Mining and Geology, University of Belgrade, Belgrade, Serbia Original scientific paper DOI:10.2298/TSCI160923303P There is a range of modern approaches and models in literature for the evaluation and determination of energy security ...
    ... diversification and energy supplier diversifica- tion, – the accessibility to resources, in terms of the availability of related energy infrastructure and energy transportation infrastructure, and – geopolitical relations. In order to provide a framework for identifying, measuring and managing v ...
    ... multi-dimensional concept of energy security, and from the selection of critical dimensions for functioning of the energy system and its safety. In APERC report on energy security in Asia [7], availability and affordability are merged with acceptability and accessibility, as four main dimensions of energy ...

  • Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++

    Branislava Šandrih, Ranka Stanković (2020)
    U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...
    ekstrakcija terminologije, validacija terminologije, GIZA++, grafovi, Unitex, klasifikacija teksta
    ... unrelated to the individual pieces, (3) non-substitutability of synonym words (e.g., by and big), and (4) ambiguity between MWE and non-MWE readings of a substring by and large (e.g., by and large we agree versus he walked by and large tractors passed him). Due to all these difficulties, tackling MWEs represents ...
    ... extraction and alignment that differ in method- ology, resources used, languages involved and purpose for which they were built. Bilingual lexica were compiled for different language pairs: En- glish/French (Bouamor et al., 2012; Hamon and Grabar, 2016; Hazem and Morin, 2016; Hakami and Bollegala, 2017; ...
    ... (Lahbib et al., 2014; Naguib Sabtan, 2016; Hewavitharana and Vogel, 2016), En- glish/Urdu (Hewavitharana and Vogel, 2016), English/Italian and En- glish/German (Arcan et al., 2017), English/Slovene (Vintar and Fǐser, 2008), English/Croatian, Latvian and Lithuanian (Pinnis et al., 2012), En- glish/Chinese ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... ine are found in samples a, b and d, while albite is found only in samples a and b. Crocidolite is found in samples b and d, while tremolite is found in samples b and c. Diopside and orthopyroxene are found in samples b and c, while talc is found in samples c and d. Minor abundant mineral phases ...
    ... by the turning: movement and pressure of the hands. The diameters of the individual fibers range between about 100 nm and 1 hm, and the length can reach a few centimeters. The fibers form heaps and clumps, and big grains are visible (see, e.g., Figure l1a, spots 3, 4,8 and 6). The red color of the ...
    ... 1080) and 620 cm-! (Figure 3), are characteristic of asbestos and similar compounds (amphiboles and pyroxenes) [14-21]. From this first analysis, it can be seen that the samples b and d on the one hand and the samples a and c on the other hand are rather similar, but sample d appears to be more h ...

  • Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica

    Natalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel (2019)
    Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and Technology

  • 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

  • Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7

    Dragoslav Rakić, Zoran Berisavljević, Irena Basarić, Snežana Bogdanović, Jovana Janković (2019)
    Part of E-80 highway that passes through Serbia (from the city of Nis to the administrative border Merdare) is 77 km long. The highway is divided into two sections: the first from Nis to Plocnik (39.4 km long) and the second from Plocnik to the administrative border with Kosovo. The route is designed through a typical plain and hilly terrain in which different geological units are dominant: crystalline schists, neogene sediments of foothills and quaternary sediments in the valley ...
    ... (clayey silts), lower weathering zone of gneiss (degraded and faulted fine grained gneiss, micaschist gneiss and amphibolite gneiss) and faulted fresh fine grained gneiss, micaschist and amphibole gneiss with appearance of marble and quartzite. In the initial zone of the section, the problem ...
    ... extremely variable along the route, and is difficult to describe in general, but has been analysed for each structure separately. In crystalline schist complex, the interaction of more compact and solid components - quartzite and marble, and softer and more degraded gneisses of different ...
    ... the Western Balkan and is part of the main regional transport network in Southeast Europe. Total length of the route is 77 km, and it is divided into two sections: the first one, 39.4 km long (ends at the Neolithic settlement Plocnik), and the second B.4 - Structures and infrastructure ...

  • A Tool for Enhanced Search of Multilingual Digital Libraries of E-journals

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Aleksandra Trtovac, Miloš Utvić (2012)
    This paper outlines the main features of Bibliša, a tool that offers various possibilities of enhancing queries submitted to large collections of TMX documents generated from aligned parallel articles residing in multilingual digital libraries of e-journals. The queries initiated by a simple or multiword keyword, in Serbian or English, can be expanded by Bibliša, both semantically and morphologically, using different supporting monolingual and multilingual resources, such as wordnets and electronic dictionaries. The tool operates within a complex system composed ...
    multilingual digital libraries, query expansion, TMX
    ... Serbian and English version of journal articles were manually preprocessed and then automatically aligned, and the alignments manually corrected using ACIDE. Table 1 shows the total, minimum, maximum and average length of articles (in words and sentences), given separately for Serbian and English ...
    ... finite automata and transducers, these dictionaries represent the basis for morphological expansion of queries. As for semantic and bilingual expansion, the system relies on wordnets (Serbian and English at present) and a bilingual English/Serbian dictionary of Library and Information Science ...
    ... online, and the Dictionary of librarianship is selected as the resource for semantic and bilingual expansion, on-line will be added as another English keyword, and onlajn and u mreži as Serbian keywords. A concurrent search with these two lists will reveal that both English terms: online and on-line ...

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • Strain partitioning in a large intracontinental strike-slip system accommodating backarc-convex orocline formation: The Circum-Moesian Fault System of the Carpatho-Balkanides

    Nemanja Krstekanić, Liviu Matenco, Uroš Stojadinović, Ernst Willingshofer, Marinko Toljić, Daan Tamminga (2022)
    oroklini, raspodela deformacija, transkurentna kretanja, Karpato-balkanidi, Cirkum-mezijski rasedni sistem
    ... orientations of faults and fault zones, foliations within fault gouge and cataclasite, faulting-related cleavage and observations of tilting and rotations. Slickenside kinematic indicators (including calcite slickenfibres, grooves and other brittle indicators), Riedel shears and brittle shear bands ...
    ... Carpathians (Fig. 1b; Fügenschuh and Schmid, 2005; Matenco and Schmid, 1999; Schmid et al., 1998) and the late Oligocene – middle Miocene creation of the curved Cerna and Timok Faults system (Fig. 1b). 2.1. The Cretaceous multi-phase nappe structure, extension and associated magmatism The remnants ...
    ... the Western and Eastern Carpathians during Paleogene-Miocene times. The nature of the subducted slab is still debated and could have had oceanic or highly extended continental character (e.g., Bokelmann and Rodler, 2014; Necea et al., 2021). The N-, NE- and E-ward Miocene roll-back and closure of ...

  • Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin

    Dušan Polomčić, Bojan Hajdin, Marina Ćuk, Petar Papić, Zoran Stevanović (2014)
    menadžment podzemnih voda, monitoring, kvalitet podzemnih voda, bilans, baza podataka

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... Conceptualisation and methodology, L.V. and S.M.; data collection by all authors; data curation, L.V., S.M. and T.D.; software and formal analysis, L.V. and S.M.; writing:— original draft preparation, L.V.; writing—review and editing, L.V., S.M. and T.D.; visualisation, L.V. and S.M.; supervision ...
    ... system was reviewed and analyzed and conclusions were made related to the genesis of the karst groundwater and its circulation conditions. 2. Materials and Methods The Krupaja system represents one of the most complex karst systems within the Beljanica karst massif, and as such, it is of gr ...
    ... channels and indicated that they may function as part of an aquifer that is completely dependent on recharge and whose circulation takes place through large and well-developed karst channels. This model of karst channels, its spatial position and dependence in relation to recharge and discharge ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Development of A Business Intelligence Tool For Accident Analysis in Mines

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Uroš Pantelić (2015)
    ... reliable information for managers and decision makers. In addition to that, different ICT support systems and tools have been developed and implemented, such as diagnostic and prognostic decision support systems, computerized maintenance management systems (CMMS) and enterprise resource planning systems ...
    ... Mining and Geology, Serbia, ljiljana.kolonja@rgf.bg.ac.rs 2 University of Belgrade, Faculty of Mining and Geology, Belgrade, ranka.stankovic@rgf.bg.ac.rs 3 University of Belgrade, Faculty of Mining and Geology, Serbia, ivan.obradovic@rgf.bg.ac.rs 4 University of Belgrade, Faculty of Mining and Geology ...
    ... g and online analytical processing (OLAP) techniques, where data warehousing pertains to collecting relevant data into a repository, where it is organized and validated for decision-making purposes. KM and BI, while having slightly different focuses, should be considered as integrated and mutually ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... zation, I.K., K.S., and D.Ž.; methodology, I.K., A.B., G.G., N.A., S.T., D.Ž., and K.S.; formal analysis, I.K., A.B., N.A., S.T., and G.G.; investigation, I.K. and K.S.; writing—draft preparation, K.S. and I.K.; writing—review and editing, K.S. and A.B. All authors have read and agreed to the published ...
    ... ics of solid residues and gases obtained by lignite/HDPE co-pyrolysis were also studied and compared to those from pyrolysis of lignite and HDPE alone. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at various temperatures (400, 450, 500, 550, and 600 ◦C). For the char ...
    ... of Applied Geosciences and Geophysics. 2.7. Characterization of Initial Substrates and Solid Pyrolysis Products Initial pre-extracted lignite; HDPE; and solid residues obtained by pyrolysis of lignite, HDPE, and their mixtures (Section 2.4.) were characterized by Rock-Eval and elemental analysis. Rock-Eval ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian

    Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić (2020)
    The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...
    Part-of-Speech tagging, lemmatization, corpus, evaluation, Serbian, morphological dictionary
    ... rule could be formulated and used. Our aim to include gram- matical categories of comparative degree (for adjectives) and gender (for nouns, adjectives, some forms of verbs and some types of pronouns and numbers) into tagger models required an update of the training corpus and addition of re- spective ...
    ... automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment between Serbian morphological dictionaries, MULTEXT-East and Universal Part-of-Speech tagset. The trained models will be used to publish ...
    ... (morphological, semantic and syntactic) rules, machine learning methods (Giménez and Màrquez, 2004; Denis and Sagot, 2009; Manning et al., 2014) or state-of-the-art Deep Neural Networks (DNNs) (Huang et al., 2015; Choi, 2016; Akbik et al., 2018). The first operational tagger and lemmatization model ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... injection and groundwater pollution control. In his scientific career, he has so far published 60 scientific and professional papers as an author and co-author, both in journals from the SCI list and international monographs (a total of 9 papers and chapters) and at international and domestic c ...
    ... scientific gatherings and expert meetings on its premises as well as in partners' exhibition and meeting halls. Within the scope of its tasks, mission, and objectives, it develops and · stimulates: a scientific approach to karst/hydrogeology, · organizes and | promotes fundamental and applied scientific ...
    ... Director of IRCK and Dr. Cao Jianhua. Scientific and technical cooperation was signed in 2011 between CKH and IRCK, so more about this visit was discussed in the chapter Scientific and technical cooperation. In June 2016, the Centre for Karst Hydrogeology and the Faculty of Mining and Geology were ...