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Упит dcterms_subject_txt:Statistical and Nonlinear Physics

2442 items

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Analysis of the intensity of erosive processes and state of vegetation cover in the zone of influence of the Kolubara Mining Basin

    Milica Živanović, Miško M. Milanović, Branislav Trivić, Snežana Đurđić, Miroljub Milinčić, Milisav Tomić, Goran Grozdanić (2024)
    Ensuring the quality protection of geospatial elements entails environmental control, a task unattainable without precise measurement results. This article aims to conduct a spatio-temporal analysis of soil degradation and vegetation status within the influence zone of the Kolubara Mining Basin in Serbia. Remote sensing is employed to assess vulnerability to erosion using the erosion potential method. A geographic information system environment is utilized to generate an erosion map, illustrating erosive processes across different time periods, particularly comparing the present situation (2022) to 1983. Results indicate that observed areas are experiencing ...
    коришћење земљишта, даљинска детекција, НДВИ, Колубара МБ, Србија

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)

  • 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 ...
    ... application with metadata editor, statistical module, lexical analisys, bag of words and tag cloud for each document, new filtering option of concordances, etc. and support- ing database organization. The number of used lexical resources is also increased by 3 new term databases and the quality of previously ...
    ... synonyms, hyponyms and hypernyms. Biblǐsa also uses various domain specific bilingual dictionaries and termbases. One of dictionaries used is “Dictionary of librarianship: English-Serbian and Serbian-English” [4]. GeolISSTerm and RudOnto were developed at the Faculty of Mining and Geology, University ...
    ... semantic, morphologi- cal and semantic, semantic and English and all tree types of expansion (full). Retrieval with full expansion is assumed to have recall 1 and other results are calculated as relative to it. Manual evaluation was performed for 24 queries, half of them with Serbian and half with English initial ...

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)

  • Using Metadata For Content Indexing Within An OER Network

    Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci (2014)

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES

  • Design and drilling of wells in formations with high pressure

    Vojin Solomun (2024)
    Objectives of this Thesis are to: - Develop an awareness of the challenges presented from elevated temperatures and pressures in well construction. - Learn the key differences between ―normal‖ condition wells and HPHT wells. - Understand some of the indicators of thermal- and pressure-related problems. - Understand the responses which may be made to mitigate high pressure and high temperature ,,HPHT‘‘ challenges while drilling wells. HPHT wells are an unavoidable consequence of the ever expanding search for oil and gas resources around the world. As wells are ...
    HPHT, well, challenges, design, oil and gas
    ... (Marshall, 2016.) Surge & Swab: - Calculate and Document surge and swab pressures for every trip in and out; - Measure and confirm surge and swab pressures when possible with memory tools; - Calculate surge and swab pressures for casing and liner installations; - Monitortrip tank volumes ...
    ... sure that minimum and maximum pore and fracture pressures are presented and understand the assumptions made by G&G. Discuss to resolve as much as possible any significant uncertainty in pore and fracture pressures. Use real time pore and fracture estimation on the rig and keep liaising with G&G ...
    ... discovered by Mobil Oil Corporation in 1968 and developed by Mobil and Pertamina. The field began production in 1975 and produces natural gas and condensates. Arun Field Picture 2.3 – Arun field (NExT, 2016.) The initial reservoir pressure was 490 bar and the temperature 177%C. ata datum depth ...

  • 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 ...

  • Timing and facies analysis of the Middle Miocene Badenian flood deposits in southern Central Paratethys—insights from KC-4 borehole, western Serbia

    Ljupko Rundić, Violeta Gajić, Stjepan Ćorić, Jelena Stefanović, Natalija Batoćanin, Marija Radisavljević, Dejan Prelević (2024)
    facijalna analiza, biostratigrafija, U–Pb datiranje, badenska transgresija, Juzni Cetralni Paratetis
    ... data were collected. Statistical analyses were not performed and only the abundance trend of some taxa was estimated. Species identification was conducted by use of a Citoval 2 Zeiss binocular microscope with foraminifera taxonomy according to Papp et al. (1978), Papp and Schmid (1985), Cicha ...
    ... grains. Taxonomy and paleoecology of ostracods follow van Morkhoven (1963), Zorn (2003, 2004), Gross (2006), Hajek-Tadesse and Prtoljan (2011), and Piller et al. (2022). SEM images of foraminifera, ostracods and calcareous nannoplankton were performed at the Faculty of Mining and Geology, University ...
    ... 5a-c). Small broken quartz and feldspar clasts are interstitial to the matrix and volcanic breccia, and there are many plagioclase phenocrysts and anhedral grains of haematite in the matrix (Fig. 5d). Coarse-grained plagio- clase phenocrysts are occasionally present and usually exhibit single ...

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...
    mine planning, variability of coal quality, simulation, coal blending
    ... of the volume and the input properties of the different layers. Calculation of the intersection of the layers and slices provides the vol- ume contribution of the layers in the slices vi and vj in eq. (7). The homogenization efficiency is then obtained by calculating the statistical properties of the ...
    ... the output (standard deviation and auto correlation function) and comparing them with the statistical properties of the input. Figure 3. Schematic illustration of a strata homogenization pile Banković, M., et al.: Improving Efficiency of Thermal Power Plants through … THERMAL SCIENCE: Year ...
    ... operation, according to Cole and Frank [4], are ash content, ash composition, sulphur content, and moisture content. Higher ash content results in increased system throughput, increased erosion, and shortened boiler and ash handling systems. Schimmoller [5] discussed coal and ash handling in search of ...

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost

  • Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++

    Branislava Šandrih, Ranka Stanković (2020)
    U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...
    ekstrakcija terminologije, validacija terminologije, GIZA++, grafovi, Unitex, klasifikacija teksta

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... ine are found in samples a, b and d, while albite is found only in samples a and b. Crocidolite is found in samples b and d, while tremolite is found in samples b and c. Diopside and orthopyroxene are found in samples b and c, while talc is found in samples c and d. Minor abundant mineral phases ...
    ... by the turning: movement and pressure of the hands. The diameters of the individual fibers range between about 100 nm and 1 hm, and the length can reach a few centimeters. The fibers form heaps and clumps, and big grains are visible (see, e.g., Figure l1a, spots 3, 4,8 and 6). The red color of the ...
    ... 1080) and 620 cm-! (Figure 3), are characteristic of asbestos and similar compounds (amphiboles and pyroxenes) [14-21]. From this first analysis, it can be seen that the samples b and d on the one hand and the samples a and c on the other hand are rather similar, but sample d appears to be more h ...

  • Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica

    Natalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel (2019)
    Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and Technology

  • 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
    ... fresh and fossil wood, and is often abundant in low rank coal and in some oils having a terrigenous origin (Simoneit et al., 1986; Heppenheimer et al., 1992; Otto et al., 1997; Stefanova et al., 2005; Tuo and Philp, 2005; Haberer et al., 2006). Lists of com- pounds identified in fossil wood and coal (Otto ...
    ... (Serbia, Denmark, Sweden, Canada and Green- land). A collection of worldwide coals and mudstones has previ- ously been analyzed for other compounds (Nytoft, 2011; Nytoft et al., 2015 and refs. therein). Several of them – from Colombia, Nigeria, Indonesia and Vietnam (tropic and subtropic), were rean- alyzed ...
    ... abundant in high latitude coals and mudstones ranging from Triassic to Miocene, and in high latitude oils (Canada and Greenland) sourced from terrigenous organic matter. The trans/(cis + trans) dehydroicetexane ratio is low in immature sediments, but usually around 0.83 in oils and mature sediments with vitrinite ...