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Упит dcterms_subject_txt:Solid solution

321 items

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multi-word units, noun phrases, query expansion
    ... the overall solution was considered as correct; b) If the system produced the correct lemma but failed to assign the correct inflectional class, whereas the assigned super-class was correct, the overall solution was considered as partly correct; c) In all other cases the solution was considered ...
    ... first of the two options offered by the strategy is the correct solution. For the third MWU, Stari Grad ‘Old City (a municipality of Belgrade)’ the strategy offers as much as 6 options, among which the third represents the correct solution. Such a large number of options offered is due to the fact that ...
    ... transducer in the last column of this partly correct solution. The 8 th MWU, petokraka zvezda is already in the dictionary which is evidenced by the fact that the column ‘ClfxDic’, and the following four columns are already filled. The solution offered by the strategy is almost the same as the one ...

  • 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

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... was developed. 3 The Improved Solution The initial solution has been used from 2008, while the development of the improved solution started at the beginning of 2015 and is available for use since June 2015. Besides tackling the problem of morphology this new solution also offers new features that enable ...
    ... example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents ...
    ... of big data that requires the solution of three basic problems: the repre- sentation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduc- AQ1 tion of document indexing as a possible solution to document represen- tation. ...

  • Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles

    Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)
    Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... perchloric acid solution, HClO4 (Merck, ‘‘Suprapure’’, p.a.) was used. The concentration of the resulting solution was determined by potentiometric titration against tris(hydroxymethyl)aminomethane. The concentration of HClO4 solution was 0.0923 M, and the concentration of NaOH solution was 0.0982 M ...
    ... of complex with standard NaOH solution. The formation constants of complexes formed were determined by titrating the solution mixture of Ru(II) complex (2 mM) and ligand (50-GMP or L-His) in concentration ratios of 1:1 and 1:2 (complex:ligand). The titration solution mixtures had a volume of 20.0 ...
    ... plexes of [Ru(terpy)(bipy)H2O] 2? are present in solution in considerable amounts (Supplementary Material, Fig. 3S). The distribution diagram of the [Ru(trpy)(bpy)- H2O] 2? ? L-His system, shown in Fig. 7, indicates that in highly acidic solution the complex [Ru(trpy) 0.0E +00 1.0E +05 2.0E +05 ...

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)

  • Using Metadata For Content Indexing Within An OER Network

    Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci (2014)
    ... Studi della Basilicata, roberto.linzalone@unibas.it, giovanni.schiuma@unibas.it, daniela.carlucci@unibas.it Abstract:This paper outlines the ICT solution for a metadata portal indexing open educational resources within a network of institutions.The network is aimed at blending academic and entrepreneurial ...
    ... resources can be published in different original languages, with adequate support offered for their translation[2]. The conceptual model of the ICT solution for BAEKTEL OER framework envisages a network of nodes offering OER content and a central repository,the BAEKTEL Metadata Portal (BMP), where ...
    ... Studi della Basilicata, roberto.linzalone @unibas.it, giovanni.schiuma@unibas.it, daniela.carlucci @unibas.it Abstract:This paper outlines the ICT solution for a metadata portal indexing open educational resources within a network of institutions.The network is aimed at blending academic and entrepreneurial ...

  • VENTEX: An Expert System for Mine Ventilation Systems Analysis

    Ranka Stanković, Nikola Lilić, Ivan Obradović (1996)
    Analiza sistema za ventilaciju je komleksan proces, koji bazira na proračunu brojnih parametara, koji se odnose na: stanje mreže, provetrenost, stabilnost sistema, gubitke vazduha, klimatske uslove, gasno stanje, ugroženost od požara i opasne prašine. Navedeni problemi se uspešno rešavaju paketom SimVent, ali potpuno razumevanje i korišćenje dobijenih rezultata zahteva angažovanje iskusnog specijaliste iz oblasti ventilacije. Rešenje je nađeno u kreiranju ekspertnog sistema VENTEX, čija je baza znanja formalizacija ekspertskog znanja iz oblasti ventilacije rudnika. U radu je prikazana metodologija ...
    ekspertni sistem, ventilacija
    ... evaluation analysis problem was proposed. As a consequence, the solution of this complex problem which is based on the estimation of a number of mutually dependent parameters is greatly facilitated. Then a possible approach to the solution of this problem through the development of an expert system ...
    ... ventilation status, ventilation system stability, air current losses, climate conditions, gas state, fire risk and dangerous dust pollution risk. The solution of these problems relies to a great extent on numerical methods. With the development of computer technology these methods were incorporated ...
    ... very often that of rules, being thus declarative in its character. Hence both procedural and declarative knowledge are needed for a successful solution of problems in mine ventilation systems analysis. This paper describes an approach to mine ventilation system analysis which is based on a symbolic ...

  • Photocatalytic Activity of the V2O5 Catalyst toward Selected Pharmaceuticals and Their Mixture: Influence of the Molecular Structure on the Efficiency of the Process

    Sanja J. Armaković, Aleksandra Jovanoski Kostić, Andrijana Bilić, Maria M. Savanović, Nataša Tomić, Aleksandar Kremenović, Maja Šćepanović, Mirjana Grujić-Brojčin, Jovana Ćirković, Stevan Armaković (2023)
    Due to the inability of conventional wastewater treatment procedures to remove organic pharmaceutical pollutants, active pharmaceutical components remain in wastewater and even reach tap water. In terms of pharmaceutical pollutants, the scientific community focuses on -blockers due to their extensive (over)usage and moderately high solubility. In this study, the photocatalytic activity of V2O5 was investigated through the degradation of nadolol (NAD), pindolol (PIN), metoprolol (MET), and their mixture under ultraviolet (UV) irradiation in water. For the preparation of V2O5, facile ...
    DFT analysis, metoprolol, nadolol, nanomaterial characterization, photocatalysis, pindolol, β-blocker
    ... dissolved in 80 mL of distilled water, resulting, in a pale yellow solution. To adjust the pH of the reaction solution to about 4, the diluted acetic acid (C(HaCOOH/Hx»O = 1:1 v/v) was added drop-wise. The final orange solution was placed into a Teflon-lined stainless steel autoclave and kept at ...
    ... did not show a positive effect on the removal of NAD and MET rom the aqueous solution (Figure 9b). Moreover, the efficiency of the process has decreased in comparison to DE We can conclude that the turbidity of the solution resulting from he presence of nanomaterials decreased the removal efficiency ...
    ... DF decomposes, the pH of the solution plays a vital role in the creation of reactive oxygen species and the further interaction of released ions and radicals. The pH value of the aqueous solutions for DF was about 7.5 + the specified pH value of the aqueous solution, reactive oxygen species can ...

  • Hybrid Model for Optimisation of Waste Dump Design and Site Selection in Open Pit Mining

    Aleksandar Doderovic, Svetozar-Milan Doderovic, Sasa Stepanovic, Mirjana Bankovic, Dejan Stevanovic (2023)
    Waste management is an unavoidable technological operation in the process of raw material extraction. The main characteristic of this technological operation is the handling of large quantities of waste material, which can amount to several hundred million cubic metres. At the same time, this operation must comply with all administrative and environmental standards. Therefore, optimising waste rock management (particularly haulage and dumping) has the potential to significantly improve the overall value of the project. This paper presents a hybrid ...
    projektovanje odlagališta i izbor lokacije, hibridni model, optimizacija, genetski algoritam

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • An Approach to Efficient Processing of Multi-Word Units

    Cvetana Krstev, Ivan Obradović, Ranka Stanković, Duško Vitas (2013)
    Efficient processing of Multi-Word Units in the course of development of morphological MWU dictionaries is not easy to achieve, especially when languages with complex morphological structures are concerned, such as Serbian. Manual development of this type of dictionaries is a tedious and extremely slow process. To alleviate this problem we turned to our multipurpose software tool, dubbed LeXimir, in the production of lemmas for e-dictionaries of multi-word units. In addition to that, we developed a procedure aimed at making ...
    Natural Language Processing, Grammatical Category, Lexical Representation, MWU, multi-word unit
    ... first of the two options offered by the strategy is the correct solution. For the third MWU, Stari Grad ‘Old City (a municipality of Bel- grade)’ the strategy offers as much as 6 options, among which the third represents the correct solution. Such a large number of options offered is due to the fact that ...
    ... transducer in the last column of this partly correct solution. The 7th MWU, petokraka zvezda is already in the dictionary which is evidenced by the fact that the column ‘ClfxDic’, and the fol- lowing four columns are already filled. The solution offered by the strategy is almost the same as the one ...
    ... possibility of a “partly” correct solution that we have recognized in the previous subsections, the evaluation results were classified as follows: 1. The system produced the correct lemma and assigned the correct inflectional class for a given MWU, and thus the overall solution is considered as correct; ...

  • Substitution reactions of some novel sterically hindered monofunctional Pd(II) complexes

    Aleksandar Mijatović, Jovana Bogojeski, Biljana Petrović, Živadin D. Bugarčić (2011)
    Reakcije supstitucije monofunkcionalnih kompleksa [(TLtBu)PdCl]+ i [Pd(tpdm)Cl]+, gde je TLtBu = 2,6-bis[(1,3-di-terc-butilimidazolin-2-imino)metil]piridin i tpdm = terpiridindimetan, sa nukleofilima kao što su: tiourea, I−, Br−, NO2−, piridin i dimetil-sulfoksid (DMSO) proučavani su u 0,1 M vodenom rastvoru NaClO4 u prisustvu 10 mM NaCl. Reakcije su sprovedene na tri različite temperature (288, 298 i 308 K) korišćenjem tehnike zaustavljenog protoka na različitim temperaturama. Reakcije supstitucije su praćene pod uslovima pseudo prvog reda sa velikim viškom nukleofila. Dobijeni rezultati pokazuju da kompleks ...
    Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry
    ... conditions. All substitution reactions were studied in 0.1 M NaClO4 aqueous solution. The NaClO4 was taken because it is well known that perchlorate ions do not coordinate to Pt(II) or Pd(II) in aqueous solution [27]. To the solution was added 10 mM NaCl to prevent the spontaneous hydrolysis of the complexes ...
    ... conditions. All substitution reactions were studied in 0.1 M NaClO, aqueous solution. The NaClO, was taken because it is well known that perchlorate ions do not coordinate to Pt(II) or Pd(II) in aqueous solution [27]. To the solution was added 10 mM NaCl to prevent the spontaneous hydrolysis of the complexes ...
    ... terpyridinedimethane, with nucle- ophiles such as: thiourea, I�, Br�, NO2 �, pyridine and dimethyl-sulfoxide (DMSO) were studied in 0.1 M NaClO4 aqueous solution in the presence of 10 mM NaCl. The reactions were carried out at three different temperatures (288, 298 and 308 K) using a variable-temperature s ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... multi-criteria decision-making methods such as Promethee, AHP, TOPSIS. Decision support models consider several criteria to determine the optimum solution, also used to support decision makers in solving complex problems through simple procedures. It is important to point out that the defined model ...
    ... after reclamation, their feature, advantages and disadvantages. Table 1. Comparison of methods which can be used for choosing a recultivation solution Method Feature Advantage Disadvantage Partial ranking of the User-friendly outranking i ; method, completeness of Does not provide a clear method ...
    ... for each alternative | an alternative is added to or the positive ideal : : . :. : in a simple mathematical form. | removed from the decision solution problem. Logical Use simple diagrams to Framework P d Clarify the cause and Greatly affected by analyze complex · : : · Approach : effect ...

  • The impact of calculation of resources and reserves on mining activity in Serbia

    Jelena Zakonović, Katarina Urošević, Radmila Gaćina (2019)
    The appearance of interest of the world's most important mining companies i for investment in Serbia imposes the problem of harmonization of domestic legislation with foreign ones. In this paper, specific categorization and classification of mineral raw materials, which do not match in domestic and foreign practice, are treated. The existence of such a conflict of criteria in use for categorization and classification can lead to misunderstanding and create certain complications in business. The following sections outline some of ...
    geological exploration, deposits, solid mineral raw materials, mineral projects, mineral resources and reserves

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... replaced by one offered solution. In the case of the Ekavian source sample, three different word forms had to be replaced – posledica ‘consequence’, delu, a form of delo ‘work’ and deo ‘part’, and rešenje ‘solution’. Two forms were correctly replaced by one offered solution – posledica and rešenje ...
    ... words” or “suspicious words” are recognized by dictionaries (as not belonging to them), a problem specific solution is applied to transform them, and they are corrected if the offered solution is in a dictionary. The problems are usually solved locally, which means that only “incorrect words” and “suspicious ...
    ... new, we repair . . . ”, pp. 61–80 punctuation marks and digits. OCR errors can also produce valid words or non-valid words. We will present the solution for detecting and correcting OCR errors developed for the compilation of the corpus of Serbian novels written and published in the period 1840–1920 ...

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • 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

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... compaction. Keywords: ѕphene, mechanochemistry, Rietveld refinement, optical spectroscopy, microstructural analysis, phase transition, solid solution Scientific Field: Geosciences Field of Academic Expertise: Crystallography UDC Number: 549.655(043.3) 541.1:548(043.3) Садржај ...
    ... Federation, 59. German, R. M. (1996) Sintering theory and practice.Wiley, New York. Gopal R. and Calvo C. (1972) Crystal structure of βVPO5. J. Solid State Chem 5: 432-435. Gražulis S., Chateigner D., Downs R.T., Yokochi A.F.T., Quirós M., Lutterotti L., Manakova E., Butkus, J., Moeck P. and ...
    ... Mater 86: 223-230. Kubelka P., Munk F., (1931) Ein Beitrag zur Optik der Farbanstriche. Zeit Für Tekn Physik 12: 593-601. Kuzmany H. (2009) Solid-State Spectroscopy, 2nd edn., Springer-Verlag, Berlin. Kunz M., Arlt T. аnd Stolz J, (2000) In situ powder diffraction study of titanite (CaTiOSiO4) ...

  • Investigation of Co0.9Ho0.1MoO4 Nanopowders Obtained by Glycine Nitrate Procedure

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... photocatalytic activity of acquiring CoooHoo.MoO+4 nanopowders was estimated by the photocatalytic degradation of crystal violet in an aqueous solution. We present a simple and effective method for controlling the composition and morphology of CoooHooMoOu, as well as a possible new approach in inorganic ...
    ... inorganic synthesis methodology. During photocatalytic testing, the studied nanoparticle powder indicated a potentially i promising solution in photocatalytic processes toward green chemistry and sustainable development. Keywords: X-ray diffraction, Electron microscopy, Nanostructured materials ...