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Упит dcterms_subject_txt:Standards for LRs

1390 items

  • A necessary and sufficient condition for an algebraic integer to be a Salem number

    Dragan Stankov (2019)
    We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... highest likelihood of predicting the ophiolite class. Furthermore, the TP rate for the ophiolite class is also the highest for the C dataset. Overall, within the C dataset, the RF_C_100 model, which employed 100 trees for modeling, was found to be the most optimal. The model exhibits a relatively ...
    ... chosen models for all three datasets are illustrated in Fig. 7. The chosen RF models comprise of 50, 100, and 250 trees for every used input dataset. The RF model, which employed the A dataset and con- sisted of 50 trees as depicted in Fig. 6, generated 935 pre- dictions for the ophiolite class ...
    ... metrics for three groups of RF models with vary- ing numbers of trees. The results indicate that the RF model utilizing the completely balanced C dataset, despite hav- ing the least amount of data for model training compared to other input data groups, yields the best overall outcomes for predictive ...

  • 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

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... stockyard is connected with a mine (pit), it is used for homogenization of run-of-mine coal or other ore or material. In order to restrict the time necessary for homogenization activities, stockyards are divided into smaller units, piles, used for homogenization of coal delivered in a relatively ...
    ... meaning that the selected number of layers will not be sufficient for the homogenization process to be carried out. It then follows that for the contractually specified range, in deciding on the level of the pit (mine), for safety reasons that range should be decreased, particularly considering ...
    ... stacking layers. In the example shown in Figure 1 it can be seen that for a range of 300 kJ/kg the number of layers should be around 50, while for an extremely small range of 200 kJ/kg more than 170. So, in general, for the entire stockyard the number of layers is around 50, however both a smaller ...

  • Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2

    Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)
    Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...
    Metals and Alloys, Biochemistry, Biomaterials, Biophysics, Chemistry (miscellaneous)
    ... Concentrations of starting solutions were 10 mg ml�1 for phospholipids, 0.2 mg ml�1 for the internal standard LPC 14 : 0, 0.2 mg ml�1 for PLA2 and 1 mM for platinum and ruthenium complexes. Incubation of phospholipids with the enzyme was performed for different substrate concentrations, metal complex ...
    ... Concentrations of starting solutions were 10 mg ml! for phospholipids, 0.2 mg ml! for the internal standard LPC 14:0, 0.2 mg ml! for PLA, and | mM for platinum and ruthenium complexes. Incubation of phospholipids with the enzyme was performed for different substrate concentrations, metal complex co ...
    ... are numerous methods established for monitoring the PLA2 activity, but they usually require radioactive or fluorescence labeling of the substrate, which implies the use of a non-native substrate for the enzyme. In addition, these methods are time- consuming for experimental preparation, while c ...

  • ‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions

    Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban (2020)
    Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...
    Firing, Glaze, Traditional ceramics, Provenance studies, Augite

  • Using English Baits to Catch Serbian Multi-Word Terminology

    Cvetana Krstev, Branislava Šandrih, Ranka Stanković (2018)
    In this paper we present the first results in bilingual terminology extraction. The hypothesis of our approach is that if for a source language domain terminology exists as well as a domain aligned corpus for a source and a target language, then it is possible to extract the terminology for a target language. Our approach relies on several resources and tools: aligned domain texts, domain terminology for a source language, a terminology extractor for a target language, and a ...
    aligned texts, word alignment, terminology extraction, electronic dictionaries, morphological inflection
    ... that if for a source language domain terminology exists as well as a domain aligned corpus for a source and a target language, then it is possible to extract the terminology for a target language. Our approach relies on several resources and tools: aligned domain texts, domain terminology for a source ...
    ... very difficult to produce and main- tain up-to-date terminology resources, especially for lan- guages for which terminology in many fields is transferred and adapted from other languages. Such is the case for Ser- bian for which terminological resources in many domains, if existing, tend to be obsolete. ...
    ... source language, a terminology extractor for a target language, and a tool for word and chunk alignment. In this first experiment a source language is English, a target language is Serbian, a domain is Library and Information Science for which a bilingual terminological dictionary exists. Our term extractor ...

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... the blend. In Serbia, biodiesel quality and usage standards are generally based on the standards of the European Committee for Standardization: • SRPS EN 500, which is based on Directive 98/70/EC, defines the requirements and test methods for diesel, including the maximum of 7% (v/v) of biodiesel ...
    ... creation of new 3national regulations and standards and to harmonization with the existing regulations and standards applied in the EU. Finally, as stated earlier, as a result of the projects: “Enabling Activities for the Development of a National Plan for Implementation of the Stockholm Convention ...
    ... with European standards and norms in the area of planning and development of space with the aim of creating conditions for international cooperation which transcends borders, and the inclusion of the Republic of Serbia in the processes of European integration. The Spatial Plan for the Republic of ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... well-known for its mining activities, which bring welfare into the region and stimulate urban development. On the other hand, it is also known for rugged, steep terrain, hostile geological environment, underground mining side-effects (settlement), which is why it has been chosen for a focused ...
    ... . - The Repository is available at: www.dr.rgf.bg.ac.rs INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND GEOTECHNICAL ENGINEERING This paper was downloaded from the Online Library of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). The library is available here: ...
    ... the City of Tuzla in Bosnia and Herzegovina, which is known for instabilities due to rugged steep slopes, but also destabilizing effects of underground and open pit mining, which has a long tradition in Tuzla. However, the main motive for considering this case study lies in severe landslidng episode ...

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... balanced SLS and PVP concentration for particle size preservation. However, solidification of developed dispersions would be the next step to maintain stability. Besides for storage, this process would be important for dose-ranging studies, which are mandatory for new drug substances [2,9]. Table 4 ...
    ... dispersions an interesting option for many challenging drug substances [7], especially the ones with solubility in water less than 200 µg/mL, high melting point, and high molec- ular weight [8]. Although suitable for almost all administration routes, the majority are investigated for oral administration. Many ...
    ... and centrifuged for 10 min at 1000× g (MiniSpin® plus centrifuge, Eppendorf, Hamburg, Germany) for plasma separation. Parts of the liver, kidney, and brain were taken as well, weighted, and homogenized in 1 mL of methanol by ultrasonic probe. Homogenized samples were then centrifuged for 20 min at 3400× ...

  • 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

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)
    ... multimedia part, and the active pages for database search. Web GIS For several projects online GIS maps were created with the ArcGIS extension: HTML ImageMapper NG2, allowing full control over cartographic quality and functionality. This approach was implemented for small to medium sized GIS Projects ...
    ... methods for ranking search results, based on weight factors associ- ated with specific fields in the function of search cri- teria. Since the data on available search fields, as well as the weight factors for each field, are located in the database, a simple change of these values provides for dynamical ...
    ... the set of results. Entering different search criteria is provided for by JavaScript functions, while the search engine was developed with the use of PHP script language and AJAX. By using HTML and CSS for markup, JavaScript for the access to DOM elements, XML (Extensible Markup Language) or JSON ...

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • 3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia

    Saša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac (2013)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • From post-disaster landslides inventory to open landslides data

    Biljana Abolmasov, Miloš Marjanović, Uroš Đurić, Jelka Krušić (2021)

  • Development of the hybrid MCDM model for evaluating and selecting bucket wheel excavators for the modernization process

    Snezana Savkovic, Predrag Jovancic, Stevan Djenadic, Milos Tanasijevic, Filip Miletic (2022)
    This paper presents a methodology for evaluating and ranking different bucket wheel excavators (BWE) for determining which machine should enter in the process of revitalization and modernization. Various multicriteria methods are used. Combining them achieves the best effect when choosing BVE for the modernization process. AHP, TOPSIS, VIKOR, and PROMETHEE methods are used. The hybrid models are developed from the multi-criteria decision making (MCDM) methods and they are used to evaluate the basic indicators that characterize the operation of ...
    višekriterijumsko odlučivanje, rotorni bageri, modernizacija, ekspertska analiza

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • 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)

  • Infotheca (Q25460443) in Wikidata

    Ranka Stanković, Lazar Davidović (2021)
    Vikipodaci su baza znanja Zadužbine Vikimedija koja predstavlja zajednički izvor različitih vrsta podataka koje koriste ne samo drugi Vikipedijini projekti, već sve više i brojne aplikacije semantičkog veba. U ovom radu ćemo prezentovati primer integracije Vikipodataka sa digitalnim bibliotekama i eksternim sistemima, kao i mogućnost ubrzanja pripreme i unosa podataka na primeru radova iz časopisa za digitalnu humanistiku Infoteka.
    semantički veb,otvoreni povezani podaci, vikpodaci,Infoteka, metapodaci časopisa
    ... publisher (P123) for published works, founding (P571) for organizations and the like. The value of an item cam be a literal itself, that is, a character string (for instance: the length of the Danube is 2860 km) or a reference to some other item (the capital of Serbia is Belgrade, for example). An item ...
    ... information about their authors was an indispensable step and a prerequisite for further work. After data entry has been completed, SPARQL 17 queries for different views were created, using Wikidata integrated technologies too for visualizing the results. Every Infotheca journal article from the Biblisha ...
    ... integra- tion of Wikidata with digital libraries and ex- ternal systems, as well as the potential for speeding up the process of data preparation and entry using the articles published in In- fotheca, Journal for Digital Humanities as an example. KEYWORDS: Semantic Web, Open Linked Data, Wikidata, Infotheca ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... machine individually during the first ten years it spent in exploitation. For each type of machine the average machine-hours were separately calculated for each year. Using the given data, the mean value of machine-hours per year for every type of machine was calculated. That data represents a valuable source ...
    ... The basis for defining the questions was the definition of the proper functioning of the dozer as well as raising the level of safety of the staff and the equipment [10]. After defining the structure of the AHP model (Figure 5), which is adapted for choosing the right type of dozer for certain con ...
    ... (input) data necessary for the analysis, results of the pair-wise comparison and ranking are presented in Tables 4–18. Because of the calculation complexity of the input data for analysis [33], only the final values of the considered alternatives are given in these Tables. Input data for the technical parameters ...