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Упит dcterms_subject_txt:Rastvorne soli

521 items

  • Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4

    Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)
    In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...

  • The number of nonunimodular roots of a reciprocal polynomial

    Dragan Stankov (2023)
    We introduce a sequence Pd of monic reciprocal polynomials with integer coefficients having the central coefficients fixed as well as the peripheral coefficients. We prove that the ratio of the number of nonunimodular roots of Pd to its degree d has a limit L when d tends to infinity. We show that if the coefficients of a polynomial can be arbitrarily large in modulus then L can be arbitrarily close to 0. It seems reasonable to believe that if ...
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... indexes, glossaries, taxonomies, thesauruses and ontologies. Basically, each of them is an extension of the one that precedes it, thus forming the so called ontological spectrum [3], as depicted in Figure 1. We will give a brief outline of these forms, but it should be stressed that the boundaries ...
    ... RudOnto is a multilingual resource, another type of relations is introduced, namely those between equivalent terms in different languages, or the so called translational equivalents. However, although a term in one language can have several equivalents in another, for practical reasons one of them ...
    ... all subfields of mining engineering, or specific mining engineering concepts. The hypernym/hyponym relation in RudOnto is enabled by involution, so that each hyponym can appear only once in the resource hierarchy, and have only one hypernym above it. All other semantic relations between concepts ...

  • 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
    ... nodes representing sets of synonymous word (synsets) which are linked by various semantic relations. The first built wordnet was English wordnet, so-called Princeton Wordnet (PWN), having today approximately 140,000 synsets. Due to its remarkable size and successful inclusion in various com ...
    ... language extension”. In the same form user can choose to morphologically inflect all chosen keywords in both languages. If she/he wishes to do so the box “With inflection” should be checked. Morphological expansion is performed by Unitex modules that use morphological dictionaries of simple ...
    ... s. This options works only if a particular query keyword is listed in the morphological dictionary of the corresponding language. If it is not so, the aligned text will be searched only with the original keyword. As shown in Figure 2, the automatically added inflected forms of chosen keywords ...

  • Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology

    Mihailo Škorić, Mauro Dragoni (2019)
    This paper is a result of a task that was presented to attendants of Keyword Search in Big Linked Data summer school, that was organized by Vienna University of Technology, under the Keystone COST action in the summer of 2017. It presents a specific approach to the classification via creation of minimal document surrogates based on the US National medical library’s MeSH ontology, which is derived from the Medical Subject Headings thesaurus. In a series of previously classified medically ...
    document classification, MeSH, ontology, information extraction
    ... considered the length of the identifiers, so they were replaced by a certain number of iterations of the parent class depending on their length, to test the assumption that the use of more specialized terms was more important for determining the class of documents. So, instead of reducing the identifiers ...
    ... restricted domain of classes, and in an unknown one. For both, the problem is reduced to calculating the similarity of docu- ments, usually with use of the so-called Dice6 index or coefficient. sim(Di, Dj) = 2|Si ⋂ Sj | |Si|+ |SJ | (1) Dice’s equation tells us that if Si is a set of terms from document ...
    ... classified, a second C# code has been prepared. It loads the classification documents one at a time and applies the script generated in the previous step so that the concepts are found by name and replaced by an ontology node identifier. This stage is the longest and the most time consuming because our experiment ...

  • Cyanobacterial diversity and toxicity of biocrusts from the Caspian Lowland loess deposits, North Iran

    Tamara Dulić, Jussi Meriluoto, Tamara Palanački Malešević, Violeta Gajić, Tamara Važić, Nada Tokodi, Igor Obreht, Bojan Kostić, Petar Kosijer, Farhad Khormali, Zorica Svirčev (2016)
    Biocrusts and adjacent sediments were collected from the so-called loess plateau of Northern Iran and the loess deposits on the foothills of Alborz Mountains. The mineralogical and granulometric analyses characterized sediments as quartz-rich clayey or sandy silts. Cyanobacterial diversity, colony morphology and grain stabilization were studied by light and scanning electron microscopy, which showed glue-like layers of cyanobacterial EPS and dense networks of filamentous cyanobacteria immobilizing finer and bigger grains, respectively. Amorphous, tuft and globular cyanobacterial colony structures were also detected. 15 cyanobacterial genera were ...
    Biokore, Cijanobakterije, Diverzitet, Cijanotoksini, Stabilizacija sedimenata, Les

  • Status and tendencies under development and application of underground coal gasification-UCG

    David Petrović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić (2018)
    Podzemna gasifikacija uglja u Svetu poslednjih decenija doživljava znatnu ekspanziju u istraživanju i razvoju zbog uveliko iskorišćenih ležišta uglja i loših ekoloških efekata (pri sagorevanju u TE) na životnu okolinu. Srbija ima znatne rezerve uglja, a kada bi se za PGU koristile samo vanbilansne rezerve i otkopni ostaci bilansnih, jasno je kakvi bi bili ekonomski (a i energetski i ekološki) efekti. U radu su sagledane aktivnosti u Svetu na tom planu, pa smatramo da ima smisla i potrebe za primenu ove ...
    energetika, ugalj, ekologija, gasifikacija

  • Annotation of the Serbian ELTeC Collection

    Ranka Stanković, Cvetana Krstev, Branislava Šandrih Todorović, Mihailo Škorić (2021)
    Ovaj rad predstavlja takozvano izdanje nivoa 2 kolekcije tekstova SrpELTeC razvijene u okviru aktivnosti Radne grupe 2 – Metode i alati COST akcije CA 16204 (Distant Reading for European Literary History) i njene specifikacije šeme. Izdanje nivoa 2 je nastavak izdanja nivoa 1, koje se koristi kao ulaz za morfosintaksičke i NER anotacije romana. Srpska obrada nivoa-2 je navedena kroz potrebne korake, uključujući metode i alate koji se koriste u tom procesu. Neki statistički podaci iz srpske kolekcije nivoa ...
    udaljeno čitanje, literarni korpus, tagiranje, prepoznavanje imenovanih entiteta, lematizacija, ELTeC

  • Structural and microstructural study of brookite based TiO2 nanocomposites with carbon black (C)

    Aleksandar Kremenović, Mirjana Grujić-Brojčin, Nataša Tomić, Maja Šćepanović (2022)
    Structural and microstructural properties of TiO2-based nanocomposites with carbon black (C), synthesized by sol-gel-hydrothermal method, have been studied by XRPD and Raman scattering. Detailed size-strain analyses of XRPD and Raman scattering results are presented in order to investigate the influence of C content on brokite and anatase phase formation. The XRPD size-strain analyses have resulted in reliable structure and microstructure results for both anatase and brookite and their relative abundance ratio has been refined by Rietveld method. The brookite ...

  • Karst wastewater as a high quality, renewable and within the circular economy water resource

    Jovana Nikolić, Vesna Ristić Vakanjac (2021)
    High quality drinking water in it’s natural state is becoming less and less available to the human population. Based on the expected climate changes, it is considered that this resource will be less in the world but also in our region. Also, the accompanying polluting components that exceed the maximum allowable concentration are increasingly present in the waters. Even after the water treatment, it happens that some components are still in the drinking water, which adversely affects human health. ...
    water resource, groundwater, karst aquifer, water supply, irrigation

  • Pećina Peštera kod Laznice - primer razvića speleoloških objekata u zoni raseda (rasednoj breči)

    Mihajlo Mandić, Ana Mladenović (2022)
    Pećina Peštera se nalazi istočno od sela Laznica kod Žagubice. Iako lako pristupačna za posetioce i istraživače, do sada nije bila predmet detaljnijih istraživanja. Pominje se samo u prikazu arheološki interesantnih objekata okoline Žagubice, ali sa svedenim i uglavnom netačnim podacima o morfološkim karakteristikama. Speleološki značaj joj daje, pored relativno velikih dimenzija dvorane, njen razvoj u tektonski veoma oštećenoj zoni ukrštanja dva raseda što za posledicu ima potpunu dezintegraciju stenske mase u breču. Proces karstifikacije breče formira specifične morfološke ...
    speleomorfologija, breča, Laznica, Žagubica

  • 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)
    ... as a very important and even sole resource in large parts of this region. The proposals that can be considered most important are: (i) opening ofnew sources for regional water supply based on alluvial groundwater and (ii) centralizing waterworks at municipality levels so that water will be adequately ...

  • 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

  • Производња и одржавање рударске опреме на примеру предузећа Колубара метал

    Вања Миловановић (2024)
    У раду је извршено пројектовање технолошког процеса израде вратила на стругу. Кроз теоријску анализу, дати су основни постулати обраде стругањем, стругови као машине алатке, врсте стругова, начини стругања и примењени алати. У практичном делу, дефинисани су редоследи операција и захвата, режими обраде, изабрана машина алатка и алати за све захвате и одређено укупно време обраде потребно да се направи финални производ. Вратило из студије случаја представља компоненту редуктора погона за копање роторног багера SRs.1200.24/4+VR.
    производно машинство, обрада метала резањем, израда вратила на стругу

  • From ELTeC Text Collection Metadata and Named Entities to Linked-data (and Back)

    Milica Ikonić Nešić, Ranka Stanković, Christof Schöch and Mihailo Škorić (2022)
    In this paper we present the wikification of the ELTeC (European Literary Text Collection), developed within the COST Action ``Distant Reading for European Literary History'' (CA16204). ELTeC is a multilingual corpus of novels written in the time period 1840—1920, built to apply distant reading methods and tools to explore the European literary history. We present the pipeline that led to the production of the linked dataset, the novels’ metadata retrieval and named entity recognition, transformation, mapping and Wikidata population, ...
    Wikidata, linked data, SPARQL, distant reading, literary corpus, named entity linking, ELTeC

  • Towards ELTeC-LLOD: European Literary Text Collection Linguistic Linked Open Data

    Ranka Stanković, Christian Chiarcos, Miloš Utvić, Olivera Kitanović (2023)
    Овај рад описује студију случаја о генерисању повезаних података креираних на основу обечежених текстуалних корпуса коришћењем формата размене података у обради природних језика (NIF). Као основа за ово истраживање послужио је подскуп корпуса ELTeC, који се састоји од 900 романа из периода 1840-1920 за 9 европских језика. Верзија романа са коментарима, у такозваном TEI level-2 формату, трансформисана је у NIF, формат заснован на RDF/OWL који има за циљ постизање интероперабилности између алата за обраду природних језика, језичких ресурса и ...
    повезани отворени подаци, корпус, SrpELTeC, NIF

  • Low-temperature phase transition and magnetic properties of K3YbSi2O7

    Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica
    ... local symmetry is lower than cubic, so 2F7/2 splits into four levels with twofold degeneracy (Kramer’s doublets). In order to describe the susceptibility within the whole temperature range, one has to account for the thermal population of Kramer’s doublets, so the molar susceptibility of K3YbSi2O7 ...
    ... site local symmetry is lower than cubic, so Fp splits into four levels with twofold degeneracy (Kramer’s doublets). In order to describe the susceptibility within the whole temperature range, one has to account for the thermal population of Kramer’s doublets, so the molar susceptibility of K3YbSi,O, is ...
    ... transition in these apatite compounds is a reversible process. For potassium-containing rare-earth disilicates two struc- ture types have been described so far, which crystallize in the space groups P63/mcm and P63/mmc, respectively (Vidican et al., 2003; Latshaw et al., 2016c; Dabić et al., 2019). The ...

  • LRMI markup of OER content within the BAEKTEL project

    Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić (2015)
    ... like author, publisher, datePublished, etc. It also defines specific metadata for types like Article, ImageObject, AudioObject, VideoObject, and so forth. The LRMI specification proposed classes AlignmentObject and EducationalAudience, as well as properties 1 : alignmentType, education ...
    ... learning resources is exploring the use of JSON-LD for sharing LRMI metadata as stand-alone records rather than embedded in the HTML of web pages so that it may be used in resource discovery by search services that are connected to the Learning Registry. Other OER projects, similar to BAEKTEL ...
    ... available in edX-platform, including a comprehensive set of course information, including enrollment information, configurable marketing copy, and so on. Figure 2: LRMI tagging in BAEKTEL Edx platform is using Mongo NoSQL database for storing courses and custom APIs are used for retrieving ...

  • Simpson's rule application for experimental determining parameters of rock mass oscillation equation at limestone

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Branko Gluščević, Luka Crnogorac (2021)
    By its form, the use of explosives has a destructive character. However, energy of chemical explosives is tamed and perfected in many effects, so that is developed a series of activities which work is unthinkable without the use of explosives. In mining industry, explosives are most commonly used for exploitation in hard rock mass. Thereby, large amounts of explosives can be used, especially for mass blasting. The application of large amounts of explosives gives auspicious techno – economic indicators ...
    working environment, seismic effects of blasting, oscillation velocity, rock mass oscillation equation, Simpson’s rule

  • Prilog poznavanju režima voda reke Visočice

    Vesna Ristić Vakanjac, Jovan Nikolić, Marina Čokorilo Ilić, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin, Jelena Ratković (2018)
    Специфични геолошки и хидрогеолошки услови у области слива реке Височице, а пре свега широко распрострањење карбонатног средње тријаског комплекса стена, као и доњо тријаске шарене серије (алевролити, пешчари, конгломерати) имали су за последицу формирање специфичног типа дренажне мреже као и специфичног режима отицаја реке Височице и њених значајнијих притока. У конкретном случају, у горњим деловима слива ове реке као и њених главних притока, у оквиру доњо тријаских седимената развијен је дендритичан тип хидрографске мреже, док преласком на средње тријаске ...
    režim, specifični oticaj, Visočica