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Упит dcterms_subject_txt:rock breakage by explosives

1106 items

  • 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 ...

  • Rule-based Automatic Multi-word Term Extraction and Lemmatization

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac (2016)
    In this paper we present a rule-based method for multi-word term extraction that relies on extensive lexical resources in the form of electronic dictionaries and finite-state transducers for modelling various syntactic structures of multi-word terms. The same technology is used for lemmatization of extracted multi-word terms, which is unavoidable for highly inflected languages in order to pass extracted data to evaluators and subsequently to terminological e-dictionaries and databases. The approach is illustrated on a corpus of Serbian texts from ...
    term extraction, terminology, multi-word units, lemmatization, finite-state transducers
    ... Površinska povreda ‘surface injury’ was ranked lower by CValue (27) than by Freq (17) because it is part of two other MWUs with three components. One of them, površinska povreda potkolenice ‘surface lower leg injury’ was ranked higher by CValue (867) than by Freq (1660), and as this term is more common ...
    ... of graphs is: AXN, 2XN (a noun preceded by a word that does not inflect in the MWU), N2X (a noun followed by a word that does not inflect in the MWU), NXN. Thus, two MWU forms mašine taložnice and korita trake ‘belt troughs’ would be both extracted by graph 03 (structure N2X) and graph 06 ...
    ... common in the mining corpus than in SrpKor, it was ranked higher by LLR (1544) and Keyness (1521) than by Freq (1660). A similar example is vibracija šake ‘hand vibration’ and MWUs that contain it. On the other hand, električna energija ‘electrical energy’ is more frequently mentioned in SrpKor ...

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... composition (fig. 1): – long-term variability as measured by trends of monthly or longer duration, and – operational variability is generally measured by short period inter-train variability around the long-term trend and is little affected by the long-term variability. The objectives of the operational ...
    ... layers can be described by the matrix: Xm Xm 0 *X where m is the number of stocked layers, / — the length of the bed, and n = //d. The volume of the material reclaimed from layer i in cut is denoted by v,,, The average grade of material reclaimed in whole cut 7 is then computed by the formula: Ny Xi xX ...
    ... and homogenization piles and geostatistical simulations are described [6, 7]. US power stations have experienced reduction in SOx emis- sions, by up to 20%, by homogenizing coal feeds to power plants [8]. Kriging technique is a very good estimator, but it is not adequate to predict the uncer- tainty ...

  • Simple 2D gravity–density inversion for the modeling of the basin basement: example from the Banat area, Serbia

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić (2019)
    We have developed a technique to calculate lateral density distribution of the sedimentary basin basement by combining linear gravity–density inversion and 2D forward modeling. The procedure requires gravity anomaly data, depth-to-basement data and density data for the sediments (density–depth distribution). Gravity efect of density variations in the basement was extracted from the total gravity anomaly by removing the joint efect of the sediments with vertical density variations and homogeneous basement of average density contrast (calculated by 2D modeling). Gravity ...
    funkcije raspodele gustine, lateralna raspodela gustine, karta gustine podloge

  • 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
    ... the age of metamorphism. The formation of white micas may be a long-lasting process, which can be strongly influenced by the chemical composition of fluids present in the rock (Roberson and Lahann 1981). Moreover, isotopi- cally non-equilibrated detrital micas can be present in metasedimentary ...
    ... was extracted from the minerals by fusing the samples by high frequency induction heating at 1300 "C. The released gases were cleaned in two steps in a low-blank vacuum system by St-700 and Ti-getters. The isotopic composition of the spiked Ar was measured by a Nier-type mass spectrometer. The ...
    ... fractions were analyzed by the K-Ar method (Balogh 1985) in the K-Ar laboratory of the Institute for Nuclear Physics of the Hungarian Academy of Sciences in Debrecen. The potassium content was mea- sured on 50 mg sample aliquots after dissolution by HF and HNOx, by a Sherwood-400 type flame ...

  • Regional Scale Screening of Groundwater Pollution Risk Induced by Regional Scale Screening of Groundwater Pollution Risk Induced by Historical Mining Activities in Serbia

    Atanacković Nebojša, Dragišić Veselin, Živanović Vladimir, Ninković Sunčica, Magazinović Sava (2015)

  • Understanding partitioning of deformation in highly arcuate orogenic systems: Inferences from the evolution of the Serbian Carpathians

    Nemanja Krstekanić, Liviu Matenco, Marinko Toljić, Oleg Mandić, Uroš Stojadinović, Ernst Willingshofer (2020)
    orogeneza, oroklini, višesmerna ekstenzija, transkurentna kretanja, Srpski Karpati
    ... 195 (2020) 103361 Available online 27 October 2020 0921-8181/© 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Understanding partitioning of deformation in highly arcuate orogenic systems: ...
    ... indicates a minimum of 10–15 km offset. The youngest sedi- ments affected by this thrusting are Lower Cretaceous limestones (Fig. 3), while the Supragetic thrust contact is truncated by all subse- quent deformation and is often covered by Oligocene - Miocene sedi- ments of the Morava Valley Corridor (Fig. ...
    ... the coupled strike-slip and orogen- parallel deformation. The former is driven by the interference with the geodynamic evolution of a different orogen (i.e. Dinarides). The latter is driven by the orogenic pull exerted by a slab-retreat in a curved orogen, where orogen-parallel deformation starts closer ...

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... etc. The physical implementation of the OpmGIS geodatabase model has been illustrated by the example of the "Field G" open pit, followed by an outline of the way spatial-temporal data are handled, as well as by an example of visualization of spatial classes in ArcMap. Keywords: geographic information ...
    ... stratigraphic characteristics are established. Results of this research are modeled by classes: Analiza, Litologija and Stratigrafija. Their common features are modeled by the abstract class Intervali, and via this class also by abstract classes GenerickiAtributi and ESRI class Object. +OBJECTID : esri ...
    ... conceptual model, followed by logical data modeling, and finally creation of a physical model, upon which the database is ready for implementation. Implementation of the OpmGIS database model has been illustrated by the example of the “Field G” open pit. It has been demonstrated how, by means of a visual ...

  • Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System)

    Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević, Ksenija Stojanović (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined. The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently ...
    ... are 1.23 and 1.74. That might be explained by a preferred release of pristane than phytane from isoprenoid moieties during slight thermal treatment of kerogen (Larter et al., 1979). In LPs from the CS, the Pr/Ph ratio is ~1, that might be caused by the increase of maturity (Peters et al., 2005 ...
    ... window“. The biomarker data suggests that mixed type I/II kerogen attained slightly higher maturity level by the CS pyrolysis than type I kerogen. The isotopic signatures of n-alkanes in LPs obtained by the OS pyrolysis are isotopically lighter than in initial bitumen (~ 2 ‰), independently on kerogen ...
    ... molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition ...

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... can obtain the scaling laws D,(T/b; b* Vy, bSX) = bY *'D A(T; Vay A), Ds(b*~'S; b* Vy, BSA) = bY *1*D6(S3 Vays A); (13) Dry (Tiny! B5 b* Vi» BoA) = 6" Dep (Tints Vins )> (14) Dy, (Tonal; O° Vi» bSX) bY Dy (Tena Vins ¥)> Dy,,(TinilBs B*Vy BOX) = BY 'Dz, (Tins Vin )- (15) The foregoing general predictions ...
    ... called subavalanches and are obtained by separation of original avalanches in the thresholding process. The correlations are evidenced by power law distributed waiting times and are present in the system even when the original avalanche triggerings are described by a random uncorrelated process. �e ...
    ... called subavalanches and are obtained by separation of original avalanches in the thresholding process. The correlations are evidenced by power law distributed waiting times and are present in the system even when the original avalanche triggerings are described by arandom uncorrelated process. Received: ...

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... relying fully on them), or by following syllabification rules prescribed by an authority, or theoretically, establishing rules for syllable borders. Experiments were carried out e.g. by Rubach & Booij (1990) for Polish, by Schiller et al. (1996, 1997) for Dutch, and by Eddington et al. (2013a,b) for ...
    ... modelled by the Poisson distribution or by one of its generalizations or modifications, see e.g. Best (2005) and Popescu et al. (2013). Table 3. Distribution of syllable length in Serbian length frequency 1 23505 2 135938 3 54556 4 6982 5 236 6 2 The data can be fitted e.g. by the h ...
    ... usually modelled by the Poisson distribution or by one of its generalizations or modifications, see e.g. Best (2005) and Popescu et al. (2013). Table 3. Distribution of syllable length in Serbian length | frequency 1 23505 2 135938 3 54556 4 6982 5 236 6 2 The data can be fitted e.g. by the hyper-Poisson ...

  • Wordnet Development Using a Multifunctional Tool

    Ivan Obradović, Ranka Stanković (2007)
    In this paper we present a multifunctional tool for manipulating heterogeneous language resources. The tool handles electronic dictionaries, wordnets and aligned texts, and provides for their synchronous use in various tasks. We focus here on the description of the possibilities this tool offers in the development of wordnets. Besides the wordnet module which enables parallel handling of two wordnets, other modules, such as the module for morphological dictionaries and the module for aligned texts, as well as available finite ...
    Wordnet development, language resource integration, HLT tools
    ... between them. In PWN, concepts are lexicalized by one or more synonymous English words (simple or compound) and represented by a synset, a set of synonymous English word-sense pairs accompanied by a definition of the concept. Concepts are interconnected by various semantic relations, such as hype ...
    ... which can be done by searching a corpus for these words and obtaining concordances. By getting the occurrences of the words within the context, the user will be able to make a better assessment whether they are really appropriate or not. In WS4LR this can be realized by creating a regular ...
    ... other languages followed, developed by individual teams or through multilingual projects, such as EuroWordNet, when wordnets for English, Dutch, Italian, Spanish, French, German, Czech, and Estonian were developed, based on the Princeton wordnet, and aligned by interconnecting synsets representing ...

  • 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

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... outside the dialysis bag was carried out by inductively coupled plasma atomic emission spec- troscopy (ICP-AES), (Spectroflame ICP, 2.5 kV"w, 27 MHz). ICP-AES analysis was performed by measuring. the intensity of radiation of the specific wavelength emitted by aluminium at 396.152 nm and with a ...
    ... of pepsin and confirms modification of the electric charge and conformational changes of pepsin caused by bound Al on the pepsin molecule. AL induced conformational changes of pepsin were verified by UV-VIS and IR spectra. Moreover, the absence of conformational changes in the haemoglobin molecule ...
    ... rm ah ea lt hc ar e. co m by TI B/ UB Ha nn ov er on 10 /2 8/ 14 Fo r pe rs on al us e on ly . Keywords: Pepsin, altıainium, kinetics, activation, electrobhoretic mobility s -| |s y- -| : 5 9 = = zi -i Introduction pepsinogen, by removal of 44 amino acids, from ...

  • 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
    ... inflection transducer by AXN3, as this MWU does not have a plural. The correction can be made by the user by stating the new, correct name of the 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 new MWU lemma by using the ‘Inflect’ function that invokes Multiflex to perform the inflection. The outlined procedure does help in answering the two last questions posed at the end of section II. However, answers to questions 2 and 3 have to be provided by the user. Thus, by following this approach ...
    ... lexical treatment of multi-word units (MWUs) that were analyzed in detail by Savary [5]. Productive classes of MWUs, like numerals and various named entities that rely on them (e.g. measurement phrases) can best be described by dictionaries in the form of finite-state transducers (FST), and a number ...

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci
    ... the entry ‘accessory plate’ with five senses, marked by letters a-e. Two senses (a and e) are related to other dictionary terms (a to ‘quartz wedge’ by CF, and e to three synonyms and two other terms by CF), and two senses (b and c) are followed by their source (Pryor). Figure 2. An example of scanned ...
    ... affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 Faculty of Mining and ...
    ... affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by / 4.0/). 1 Faculty of Mining and Geology ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... collection. However, this shortcoming can be rectified by correcting errors (based on the list of words unrecognized by the 5 The name of the person was de-identified for privacy reasons. vocabulary), and by continuous enhancement of the vocabulary by adding new words. 6 Conclusion and Future Work The ...
    ... for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The ap- proach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several ...
    ... will be done by applying the new solution to other textual databases, as well as by applying a geodatabase for visualization of location of recognized named entities. An analysis of queries in the full sentence form is planned, which would eliminate stop words — prepositions, followed by lemmati- zation ...

  • 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
    ... induced by the rock stress surrounding the gate road. Deformation dynamics is the study of time varying response of support under dy- namic loads. These loads are primarily considered a change of rock stress intensity induced by mining activities. As a stope approaches the gate road, the rock stress intensity ...
    ... uniaxial compressive strength of rock. Grey system prediction models were developed by Xiaobo Xiong [3] for forecasting rock tunnel displacement considering the non-linear parameters of the deformation of the tunnel. Ping Tang [4] forecasted the working face underground pressure by applying a grey system theory ...
    ... underground mines are characterized by low mechanized mining methods and production disruptions can happen often. Such mining methods are characterized by a long production cycle, and if we add disruptions then it is obvious that the gate road support is exposed to the rock stress much longer than is the ...

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... analyzed within a longer period, the time dimension can be displayed by year, by quarter of the year, then by month, by date and finally selected injury levels. Figure 8 presents the number of injuries by quarter of the year, then by month, with severity of the injury, in tabular and graphical format ...
    ... y between diverse software components is secured by a system of ontologies developed for mining engineering named RudOnto. In the next section we give an overview of ICT support in knowledge management in Serbian mining companies, followed by an outline of related terminological resources developed ...
    ... time when the injury at work occurred is defined by the date, the working hour, and the shift, whereas the time of the day and day of the week are also entered for the purpose of later analyses. The place where the accident occurred is determined by location and site, and a record is also made of ...