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Упит dcterms_creator_txt:Teodorović A.

1567 items

  • Хазард од клизишта у Србији у 21. веку

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

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)
    ... was marked with a high natural α-radioactivity. Cerska slatina was slightly acidic with a pH of 6.74 and with a HCO3–Na, Ca wa- ter type, originating from an aquifer in granitoid rocks. A high content of radium isotope was found in the spring water (226Ra: 2.56±0.09 Bq/L) and a low concen- tration ...
    ... chlo- rides (3.75 %) and sulphates (1.25 %). Hierarchical cluster analysis A regional hydrogeochemical study is a multivariate problem because of a large number of chemical parameters (variables) associated with a large number of sampling sites (observations). Although multivariate statistical ...
    ... the more dilute waters. Here, a Phenon line with a linkage distance of 5 was chosen, which led to 6 clusters (C1–C6). Fig. 2. (a) The Dendrogram showing the six clusters; (b) The Stiff diagrams showing the average compositions of each cluster. 7 For a clearer presentation of the results ...

  • 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
    ... 1.14 (a-H), m 1.74 (b-H), d*, 12.8 26.00 1.14 (a-H), m 0.71 (b-H), m 2 22.27 1.49 (2H), m 22.49 1.42 (2H), m 3 42.52 1.24 (a-H), m 1.33 (b-H), m 33.96 1.03 (a-H), m 1.19 (b-H), m 4 34.18 – 33.43 – 5 56.95 1.12, m 52.1 1.46, m 6 28.38 2.12 (a-H), dd*, 8.0, 13.5 1.05 (b-H), m 23.51 1.90 (a-H), m ...
    ... addition, a trisubstituted benzene ring was identified. It was apparent from HMBC data that the methyl groups belonged to two different geminal pairs. One pair gave long-range correla- tions to one quaternary carbon, a methylene and a methine, whereas the other pair correlated to a methine and a substituted ...
    ... 38.83 1.40 (a-H), ddd*, 2.8, 13.4, 13.4 2.27 (b-H), dddd, 1.5, 3.4, 3.4, 12.6 2 19.32 1.60 (a-H), m 1.75 (b-H), m 3 41.72 1.21 (a-H), m 1.47 (b-H), dddd, 1.6, 3.3, 3.3, 13.2 4 33.43 – 5 50.41 1.35, dd, 2.3, 12.5 6 19.10 1.87 (a-H), dddd, 2.1, 2.1, 7.5, 13.3 1.70 (b-H), m 7 30.49 2.86 (a-H), m 2.92 ...

  • Geotechnical Conditions for Construction of Savski Trg Metro Station as a Part of the Belgrade Metro Line One

    Nemanja Stanic, Dragoslav Rakic, Josip Isek, Slavoljub Simic (2024)
    In order to solve serious traffic congestion in Belgrade, a number of studies regarding the Belgrade Metro construction have been carried out since 1973. However, only in 2019, the routes of the future metro lines 1 and 2 were de-fined as a part of the General Metro Construction Project. The lines are de-signed to intersect at the location of Sava Square, where an interchange met-ro station will be built. It represents a complex geotechnical structure consist-ing of three different ...
    metro station, geotechnical modelling, displacements

  • 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
    ... removal of 44 amino acids, from its amino terminus, to give a single chain enzyme with a low pl and three disulfide bridges. Each lobe of pepsin contains a catalytic aspartic acid residue Asp?? and Porcine pepsin A (EC 3.4.23.1), a prominent member of the aspartic protease, is the principal ...
    ... decreased in a dose dependent manner (Figure 5 B). Figures 5 A and B shows only UV spectra in a presence ofIO0mM AP?. IR studies. IR spectra of pepsin and haemoglobin in KBr matrices in absence (solid curve 1) and in a presence 1IOmM Al ions (dotted curve 2) are presented in Figures 6 A and B. ...
    ... slope or intercept), (I/A) against 1 / [Al3+], where A is defined as slope or intercept in the absence of activator (Al' + ions) minus that in its presence. (1,5, 10mM) and intensity of characteristic peaks have been decreased in a dose dependent manner (Figure 5 A). However, the presence of ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... average unit cell values calculated as a mean of 14 measurements are a = 5.748(06) A, b = 5.680(85) A, c = 5.775(42) A, and B = 112.05(95)?*. The calculated val- ues for Drenjak locality, the mean of four measurements, are: a = 5.744(8) A,b= 5.678(55) A, c=5.774(03) A, and P = 112.05(65)”. As reported ...
    ... electron diffraction (SAED) of the pristine, homogenous region of arsenopyrite crystal are a =5.75 A,b =5.68 A, c= 5.76 A, a, y = 90*, and 8 = 111.5 . - TEM analysis of analysed arsenopyrite confirms a monoclinic crystal system, space group P2y-. We identified numerous polysynthetic {101} twinning ...
    ... average unit cell parameters measured by XRPD of near-stoichiometric arsenopy- rite from the Drenjak locality, as a mean of four measurements, are a = 5.744(8) A, b =5.678(55) A, c = 5.774(03) A, ., y = 90*, and 8 = 112.05(65) ?*. - The unit cell values calculated from the thin TEM sample using selected ...

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)
    ... knowledge, we have resorted to a modification of this model by including a new (fourth) element, featuring the production (IF-THEN) rules related to an object in the model. Thus both the procedural and declara- tive knowledge related to a class object could be represented. Such a modified OOA model was then ...
    ... user interface and a working memory, but also a module for the interface with routines for relevant parameters determination, the Visual Basic routines themselves, and a database used by these routines (Fig. 3). The main purpose of the user interface is to provide means for a successful dialogue ...
    ... 2010 Keywords: Mining engineering Mine safety analysis Intelligent hybrid system Expert system Neural network a b s t r a c t Analysis of safety in surface coal mines represents a very complex process. Published studies on mine safety analysis are usually based on research related to accidents ...

  • 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

  • Keyword-Based Search on Bilingual Digital Libraries

    Ranka Stanković, Cvetana Krstev, Duško Vitas, Nikola Vulović, Olivera Kitanović (2017)
    This paper outlines the main features of Biblisha, a tool that offers various possibilities of enhancing queries submitted to large collections of aligned parallel text residing in bilingual digital library. Biblishsa supports keyword queries as an intuitive way of specifying information needs. The keyword queries initiated, in Serbian or English, can be expanded, both semantically, morphologically and in other language, using different supporting monolingual and bilingual resources. Terminological and lexical resources are of various types, such as wordnets, electronic ...
    ... tools and translation vendors [9]. A TMX document consists of a header and a body. The header consists of metadata describing the aligned texts, while the body contains a set of transla- tion units (TU) with two or more translation unit variants (TUV), containing a same text segment in different languages ...
    ... preceded by an identification of the document it originates from which contains a link to the full text of a docu- ment form which it was extracted. Within this identification is a link to the full metadata of a retrieved document. A few concordance lines for the initial query rudnik ‘mine’ are presented in ...
    ... search. When performing monolingual search of metadata, a user can make use of a form with predefined fields for the most commonly used data: author’s name, words from an article title, year of publication, and article keywords. As a result, a list of all articles in the language of the query that fulfill ...

  • Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia

    Predrag Radović, Miloš Radonjić, Emmanuel Billia (2020)
    Finds of Pleistocene rhinoceros are rare in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East ern Serbia). Both the morphological and metric characteristics of the teeth are consis tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no ...
    rhinoceros, Stephanorhinus hundsheimensis, Serbia

  • Bioleaching Process for Copper Extraction from Waste in Alkaline and Acid Medium

    Ivica Ristović, Darina Štyriaková, Iveta Štyriaková, Jaroslav Šuba, Emilija Širadović (2022)
    Flotation wastes are becoming a valuable secondary raw material and source of many metals and semimetals worldwide with the possibilities of industrial recycling. The flotation tailings contain oxide and sulfide minerals that have not been sufficiently stabilized and form acidic mine waters, which in turn contaminate groundwater, rivers, and reservoi6sediments. An effective way to recycle these mine wastes is to recover the metals through leaching. While the focus is on acid bioleaching by iron- and sulfur-oxidizing bacteria, alkaline leaching, ...
    bakar, alkalno, kiselo bioluženje, sekundarne sirovine

  • A Multilingual Evaluation Dataset for Monolingual Word Sense Alignment

    Sina Ahmadi, John P McCrae, Sanni Nimb, Fahad Khan, Monica Monachini, Bolette S Pedersen, Thierry Declerck, Tanja Wissik, Andrea Bellandi, Irene Pisani, [...] Ranka Stanković and others (2020)
    Aligning senses across resources and languages is a challenging task with beneficial applications in the field of natural language processing and electronic lexicography. In this paper, we describe our efforts in manually aligning monolingual dictionaries. The alignment is carried out at sense-level for various resources in 15 languages. Moreover, senses are annotated with possible semantic relationships such as broadness, narrowness, relatedness, and equivalence. In comparison to previous datasets for this task, this dataset covers a wide range of languages ...
    lexical semantic resources, sense alignment, lexicography, language resource

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... HW110g was a fine powder which could also be investigated without grinding. XPS was measured on a Phi5000 VersaProbe II from ULVAC- Phi Inc., USA with a monochromatic Al K, source at 1.486 keV, 50 W, 15 kV and with a 200 m spot. For the survey spectra, a pass energy of 187.5 eV was set with a step width ...
    ... MI, Gao B, Yao Y, Xue YW. Zimmerman A, Mosa A, et al. A review of biochars as a low-cost adsorbent for aqueous heavy metal removal. Crit Rev Environ Sci Technol. 2016; 46: 406–—433. https://doi.org/10.1080/10643389.2015.1096880. Enaime G, Bacaoui A, Yaacoubi A, Liibken M. Biochar for wastewater ...
    ... at 500 "C with a contact time of < 2 s from chopped spruce (Picea spec.) wood chips after drying to a moisture content of less than 10% [67]. HW500f was pro- duced by fast pyrolysis of hard wood in a fluidized bed reactor at 500 "C with a contact time of < 2 s. It was received as a fine powder from ...

  • Zaštita od miniranja

    Suzana Lutovac, Miloš Gligorić (2024)
    Miniranje

  • The preliminary selection of oil reservoir in Serbia for carbon dioxide injection and storage by a multicriteria decision-making approach: a case study

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović (2021)
    geološko skladištenje CO2, naftna ležišta, Srbija, VIKOR, TOPSIS
    ... preliminary selection of oil reservoir in Serbia for carbon dioxide injection and storage by a multicriteria decision-making approach: a case study | Lola Tomić, Vesna Karović Maričić, Dušan Danilović | Energy Sources, Part A: Recovery, Utilization, and Environmental Effects | 2021 | | 10.1080/15567036.2021 ...
    ... Sources, Part A: Recovery, Utilization, and Environmental Effects ISSN: (Print) (Online) Journal homepage: https://www.tandfonline.com/loi/ueso20 The preliminary selection of oil reservoir in Serbia for carbon dioxide injection and storage by a multicriteria decision-making approach: a case study Lola ...
    ... Danilović (2021): The preliminary selection of oil reservoir in Serbia for carbon dioxide injection and storage by a multicriteria decision-making approach: a case study, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, DOI: 10.1080/15567036.2021.1936303 To link to this article: ...

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija
    ... The main difference between central heating and local heating systems is that with a central heating system, the heat generation occurs in one place, such as a furnace/boiler room in a house or a mechanical room in a large building [47]. In the case of local heating (area-dedicated heating systems) the ...
    ... refers to the use of energy to provide heat in the interior area of a dwelling [7]. The term household is defined as [23]: a) A community of persons whose members live together, pre- pare food, and spend earned income jointly. b) A single person, living, preparing food, and spending income on his/her ...
    ... this type of survey. Hu et al. [5] emphasized that it is important to use a survey method to achieve a comprehensive understanding of occupants’ heating-related behaviors and their demand for heating. Surveys have proven to be a useful method for collecting detailed data on residential heating systems ...

  • The number of unimodular roots of some reciprocal polynomials

    Dragan Stankov (2020)
    We introduce a sequence P2n of monic reciprocal polynomials with integer coefficients having the central coefficients fixed. We prove that the ratio between number of nonunimodular roots of P2n and its degree d has a limit when d tends to infinity. We present an algorithm for calculation the limit and a numerical method for its approximation. If P2n is the sum of a fixed number of monomials we determine the central coefficients such that the ratio has the minimal limit. ...
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials
    ... known that the minimal polynomial of a Salem number is reciprocal. We say that a polynomial of degree d is reciprocal if P (x) = xd P (1/x). If moduli of coefficients are small then a reciprocal polynomial has many unimodular roots. A Littlewood polynomial is a polynomial all of whose coefficients ...
    ... There is a bound B1 of the modulus of the first derivative of f2(t ). Indeed | f ′ 2(t )| = | ∑k j=1 j a j sin j t | ≤ ∑k j=1 j |a j | =: B1. (ii) There is a bound B2 of the modulus of the second derivative of f2(t ). Indeed | f ′′ 2 (t )| = | ∑k j=1 j 2a j cos j t | ≤ ∑k j=1 j 2|a j | =: B2 ...
    ... unimodular. If |a | > 1 then +k C(x2" + ay x" + ax" +1) = 2arccos(1/a))/1 so that it has the minimum value 2/3 when a) = 2 and C(P) tends to one as a approaches infinity. If we exclude trinomials and quadrinomials then it is clear that the limit points of C(P2,) are always greater than zero. A natural question ...

  • The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)

    Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov (2019)
    Geography, Planning and Development,Aquatic Science,Biochemistry,Water Science and Technology

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija