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Упит dcterms_subject_txt:Optical and Magnetic Materials

2350 items

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... landslides were defined as translational and rotational debris and earth slides and rock falls. Over 60% of the occurrences have been defined as intermediate and deep, and those mostly occurred in debris material overlying hard rock masses or in fluvioglacial and proluvial sediments. The depth of some ...
    ... depending on the analyzed region and conditioning parameters used, the proportions and values of the ratings and sensitivity co- efficients need to be carefully selected. This selection should be done by an expert team and then checked by running several combinations of ratings and sensitivity coefficients ...
    ... type (14.08% and 16.6%, for WLT-TLSR-100 and WLT- TLSR-500 variants, respectively), followed by slope inclination (12.97% and 14.69%, for WSI-TLSR-100 and WSI-TLSR-500 var- iants, respectively). The smallest changes in landslide distribution are noted for land use (6.83% for WLU-TLSR-100 and 2.39% WL ...

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... ropalaeontological, magnetostratigraphic and · geochemical methods. The Dedina section yields rich and diverse associations of macrofauna represented by cephalopods (ammonites, aptychi and belemnites), brachiopods, and bivalves. Among the most frequent and diverse are ammonites. The current study ...
    ... Besnosov and Mikhailova (1991), Wright et al. (1996), Kvantaliani et al. (1999), Klein (2005), Arkadiev and Bogdanova (2004, 2005), Bogdanova and Arkadiev (2005), Arkadiev and Bogdanova (2012), Arkadiev (2014), Bulot et al. (2014), Frau et al. (2016a,b), Hoedemaeker et al. (2016), and Szives ...
    ... tional deposits between the Tithonian and Berriasian and, according to Arkadiev and Bogdanova (2012), from the lower Ber- riasian (Jacobi Zone) of Crimea, Bulgaria, Romania, Austria, France, and Spain. Occurrence. Light grey marlstones of layers 80 and 96. Pseudosubplanites subrichteri (Retowski ...

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... properties and relations with other objects. GIS allows users to create queries, analyze spatial information, manage data and maps, and present results of all these operations. GIS enable the user to create regional and detailed maps of both active and prospective open pits, model the geology and the terrain ...
    ... geometry (data defining the shape and size of an entity and its position in space) and topology (data defining relations between different geographic entities). Consequently, there are three basic groups of data in a GIS, namely: vector data, attribute data and raster data. Geodatabase development ...
    ... development reduces data redundancy and enables better documenting and maintenance of the entire system. The general strategy for using UML CASE tools for design and development of geodatabases entails the use of UML for defining the database schema, creation of classes, and only after that, filling with ...

  • Trace elements and garnet formation in a distal skarn zone: a case study of the Rudnik deposit, Central Serbia

    Bojan Kostić, Pavle Tančić, Natalija Batoćanin (2024)
    geohemija granata, retke zemlje, fluidne inkluzije, skarnovsko ležište Rudnik

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

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... can be used to calculate, plan, control and predict the quality of ore being stacked and/or reclaimed with a great degree of accuracy. Robinson (2004) presents mathematical and computer models for the geometry of a stockpile, using both actual grade data and a variogram to describe the input variation ...
    ... chevron and window methods. Given than the windrow method is technologically more complex and requires the use of more complicated and more expensive machines, the chevron method is generally more desirable. There is no general rule defining which number of layer is considered small and which ...
    ... causes problems in organizing operations at the stockyard and arranging coal stacking and reclaiming. Namely, the rule is that piles are alternately filled and emptied, so that when the pile is being filled it is filled completely, and emptied completely when being emptied. In the example of coal ...

  • Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases

    Nikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić (2021)
    Ispitivani su uticaji primene mono- i dvokomponentnih organskih modifikatora na određivanje lipofilnosti 12 tetradentatnih Šifovih baza metodom reverzno-fazne tankoslojne hromatografije. Osnovni cilj je da se proceni tip interakcije između posmatranih jedinjenja i komponenti primenjenih hromatografskih sistema i uspostavi neki obrazac ponašanja kako bi se lakše izabrala kombinacija organskih modifikatora koji će simulirati interakciju u biološkim sistemima na osnovu činjenica da iste osnovne intermolekularne interakcije su odgovorne za ponašanje supstanci i u biološkom i u hromatografskom sistemu. Primenjeni organski modifikator ...
    Šifove baze, Lipofilnost, RP-TLC, Organski modifikatori

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... Subunit and one at the contact between them (Fig. 5, Table 1). Each thin-section was cut parallel to the stretching lineation in the sample. We used optical microscopy to determine mineral assemblages, metamorphic grade, and micro-scale deforma- tions in the Serbo-Macedonian, Supragetic and their contact ...
    ... direction/dip and stretching lineation trend/plunge taken in the Serbo-Macedonian and Supragetic Unit and at their contact (i.e., measurements taken in the tens of metres wide zone at the contact between the two tectonic units) were separately analysed. By combining map data and our field measurements ...
    ... Serbo-Macedonian Massif and Supragetic units. Sampling site V2. Parallel-polarized lights in c and cross-polarized lights in d and e. f — Top-NE normal sense of shear in the Supragetic unit in cross-polarized lights. Sampling site V1. 402 STOJADINOVIC, KRSTEKANIĆ, KOSTIĆ, RUŽIĆ and LUKOVIĆ GEOLOGICA ...

  • From DELA Based Dictionary to Leximirka Lexical Database

    Biljana Lazić, Mihailo Škorić (2020)
    In this paper, we will present an approach in transforming Serbian language Morphological dictionaries from a DELA text format to a lexical database dubbed Leximirka. Considering the benefits of storing data within a database when compared to storing them in textual documents, we will outline some of the functionality that the database has made possible. We will also show how hand-made rules that use category labels lexical entries are marked with can be used to link lexical entries. ...
    Morfološki rečnici, jezički resursi, Leksimirka
    ... simple and multiword units. The basic components of the simple word morphological vocabulary system are DELAS (fr. DELA de formes simple) and DELAF (fr. DELA de formes Fléchies) (Courtois and Silberztein, 1990). A single DELAS entry consists of a word lemma and its inflective, semantic, and syntactic ...
    ... compound nouns “NC” and grammatical categories for the masculine “m”, the plural “p”, accusative case “4” and the animateness tag for living beings - “v”. For the sake of simplicity, semantic and domain markers were omitted in the example. All types of dictionaries were stored and used in the form of ...
    ... from the morphological dictionaries and to make them in- teroperable and reusable. Three standards for lexical information have been considered: Guidelines for Electronic Text Encoding and Interchange, Text Encoding Initiative (TEI)3, Lexical Markup Framework (LMF)4 and the Lemon model5. Although Chapter ...

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... metamorphic rocks from the Getic zone and the SMM that have experienced clockwise rotation and dextral strike-slip tectonics during the Alpine orogeny (e.g. Csontos and Voros 2004; Figenschuh and Schmid 2005). The evidence of pre-Variscan deformation and HP metamorphism proposed previously ...
    ... amphibolite facies overprint and locally migmatisation occurring in the Variscan (Dimitrijević 1967; Balogh et al. 1994; Zagorchev and Milovanović 2006; Nenova and Zidarov 2008; Peytch- eva et al. 2009a; Antić et al. 2015b). Additionally, U-Pb dating of titanite and several K/Ar analyses have yielded ...
    ... kyanite eclogites and eclogittized gabbro-norites of the Serbo- macedonian unit. Central Serbia, reaction textures and geother- mobarometry. Zbornik abstraktov. Bratislava, pp 13-14 Kostopoulos D, Reischmann T, Sklavounos S (2001) Palaeozoic and early Mesozoic magmatism and metamorphism in the ...

  • Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy

    Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana (2021)
    ... Miskolc, Hungary CULTURAL HERITAGE AND PROTECTION OF HAND-WHEELED POTTERY MANUFACTURE IN WESTERN SERBIA: CHARACTERISTICS OF ZLAKUSA POTTERY BASED ON SEM-EDS AND OPTICAL MICROSCOPY MILOŠEVIĆ, M.1, ZDRAVKOVIĆ, A.1, ĐORĐEVIĆ, B.2 & JELIĆ, I.3 1Faculty of Mining and Geology, University of Belgrade ...
    ... Измењено: 2023-10-14 04:27:01 Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana Дигитални ...
    ... Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy | Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana | 8th ...

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... are vastly spread both horizontally and vertically (approximately 300m in thickness) and discordantly lies over the older beds. They are consisted of sandy and grav- elly clays, clayly and ironaceus quartz sands and semi-consolidated sand- stones, laterally and vertically shifting on the bauxite ...
    ... adit (GIP) to the surface, and afterwards with the same truck to the ore dump location. A special feature of this project requires an analytical and systematic approach when de�ning the existing spatial position and geometry, and setting out structures designed at and under the terrain surface ...
    ... mining and surveying tasks during the pre-project and project stage of mining, as well as during the construction of mining facilities and excavation of mineral resources. Speci�c features of the project concerning excavation of the remaining reserves of bauxite in the deposit of "Podbracan", and in this ...

  • Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis

    Ivan Kojić, Achim Bechtel, Reinhard Sachsenhofer, Dragana Životić, Ksenija Stojanović (2019)
    ... fractions of lignite extracts and pyrolysis prođucts are садајепе and retene. The matunty ratios based оп trimethyinaphthalenes (ТММЕ) and tetramethyinaphthalenes (TeMNr) slightly increase from Pyr400 to Pyr500. The same 15 тејајед to methylfluorene (МЕ) гано (2-+3-MF)/(1-+4-MF) and methyiphenanthrene (МР) ...
    ... Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs MATURATION AND ISOTOPIC СНАМСбЕ5 ОЕ INDIVIDUAL HYDROCARBONS IN LIGNITE LITHOTYPES THROUGH DIAGENESIS AND EARLY CATAGENESIS ...
    ... 400 "С and 500 %C. Aliphatic апд aromatic fractions isolated from lignite extracts and hquid pyrolysis prođucts were analyzed by gas chromatography-mass spectrometry. Carbon isotope determinations (65С) of indiviđual compounds in these fractions were also performed. Compositions ог апрћанс and aromatic ...

  • 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
    ... scanned and then optical character recognition (OCR) is applied. A text that fully corresponds to the original is rarely obtained since OCR is prone to errors. The quality of the resulting text depends on various factors: the software used, quality of the paper and print of the original text, and its language ...
    ... called “diacritic restoration”, and procedures that perform this task using various approaches were developed for many languages. (Krstev et al., 2018). Errors produced during machine text input, for instance by Optical Char- acter Recognition (OCR), are of a different type and different solutions were developed ...
    ... confused, for instance letters ‘п’, ‘и’, ‘н’, letters ‘с’ and ‘е’, letters ‘с’ and ‘о’ (but not ‘е’ and ‘о’); – A group of letters can be confused for one letter or another group of letters, e.g. two letters ‘га’ and one letter ‘ш’; two letters ‘шп’ and two letters ‘иш’; – Letters can be confused for digits ...

  • Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia

    Maja Milošević, Bojan Kostić (2022)
    ... spacing value of 15.11 Å at 5.86 (2θ) and less frequent minerals such as quartz, carbonates and feldspars. This mineralogy was confirmed by XRD for oriented, saturated and heated samples. DTA curve, in addi- tion to the typical peaks related to montmorillonite (≈ 140 °C and 600 °C), also contains two smaller ...
    ... clay has a high content of montmoril- lonite and a smaller amount of quartz, carbonates, iron oxy/hydroxides and feldspars. Acknowledgements. Ministry of Education and Science, Republic of Serbia, on realization and financing of scientific research work in 2022, contract No. 451-03-68/2022-14/200126 ...
    ... Kliment Ohridski” Earth and Man National Museum Scienti�c and Technical Union of Mining, Geology and Metallurgy PLATINUM SPONSOR GOLD SPONSORS ORGANIZERS AND SPONSORS Lead partner Host Institution ...

  • 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
    ... Šandrih, and Kitanović 2019). For a number of years now, students at the Faculty of Mining and Geology have been undergoing training to enter data into and use the Wikidata11 database, while the In- telligent Systems doctoral course features the subjects Knowledge Represen- tation and Semantic Web ...
    ... the item’s corresponding title and description, so as to remove any ambiguity. An identifier of a data item (QID) can, in addition to being linked to a title and a description, have a number of aliases and statements (claims, expressions) representing its properties and values. A statement is an ordered ...
    ... RDF triples and it is a very important step. Here are some characteristic examples with comments: – Title (P1476), in English and Serbian (both scripts, Cyrillic and Latin, for the sake of search); – Main subject of the creative work (P921), key words, where the existing ones are linked and new ones are ...

  • Classification of Terms on a Positive-Negative Feelings Polarity Scale Based on Emoticons

    Mihailo Škorić (2017)
    The goal of this paper is to draw attention to the possibility of using emoticon-riddled text on the web in language-neutral sentiment analysis. It introduces several innovations in the existing framework of research and tests their effectiveness. It also presents a software tool especially made for that purpose, explains how it builds a database with sentimental value of terms and offers the user manual. Finally, it presents a software tool that tests the new database and gives some examples ...
    data mining, information extraction, emotions, text on the web
    ... will be searched for and the values that they stand for. Determiners and values can be set one by one, or this step can be skipped. In case this step is skipped, the software will automatically load the default determiners and their values (Table 1). All default determiners and their values listed in ...
    ... are replaced with hahaha and haha respectively. If this option is not checked, this step will be skipped and only determin- ers in its default form, which is listed on the advanced mining tab, will be found and processed. The mere extraction involves loading selected terms and their values from advanced ...
    ... will not be executed, and if the value of an expression is not between −1 and 1 the program will report an error and stop the execution. After each of the determiners is replaced with a node whose attribute is its value (Figure 6), XML document becomes well-formed again and is ready for further processing ...

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... Cupressaceae and Phyllocladaceae, whereas cuparene and dehydroicetexane are specific for Cupressaceae (Nytoft et al., 2019). Slight input of aquatic macrophytes and ferns is also evident. The degrees of aromatization of diterpenoids and non-hopanoid pentacyclic triterpenoids (Stojanović and Životić ...
    ... greater contribution of angiosperms. The contents of C27 and C29 n-alkanes in relation to C31 and C33 homologues imply similar impact of forested and reed-mire vegetation. The presence of tricyclic (abietane, pimarane, isopimarane) and tetracyclic (phyllocladane, bayerane, kaurane) diterpenoids ...
    ... DISTINGUISH LOWER AND MIDDLE MIOCENE LIGNITES FROM THE COAL-MINING DISTRICT OF LUSATIA I. Kojić1, J. Kus2, D. Životić1, K. Stojanović1 1University of Belgrade, Serbia 2Federal Institute for Geosciences and Natural Resources, Germany The organic geochemical study of Lower and Middle Miocene ...

  • Environmental flows and demands for sustainable water use in protected karst areas of the Western Balkans

    Zoran Stevanović, Aleksandra Maran Stevanović, Želimir Pekaš, Romeo Eftimi, Veljko Marinović (2021)
    Karst terrains cover some 30% of the Western Balkans, where rich karst aquifers represent the main source of potable water supply and ensure the development of local economies and tourism. In this “classical karst” region, there are also numerous sites or areas under different forms of protection—from those that are included in the UNESCO World Heritage list to natural monuments and landscapes that are protected by national legislation. In and around them are specific representatives of flora and fauna ...
    Karst, Zaštićena područja, Ekosistem, Ranjivost i održivost, Zapadni Balkan