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345 items

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy. ...
    ... well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy. ...
    ... production of hydrogen [39], or semi-coke [36]). As for coal and hydrocarbon fuels, formulas for the calculation of the calorific value of plastic waste material and biomass plastic fuel were proposed [40,41]. Less attention was given to detailed characterization of all three (solid, gas, and liquid) products ...

  • The interaction of organoselenium trans-palladium(II) complexes toward small-biomolecules and CT-DNA

    Vera M. Divac, Aleksandar Mijatović, Marina D. Kostić, Jovana Bogojeski (2017)
    Serija organoselenijum trans-paladijum(II) kompleksa 1 (bis(2-(fenilselanilmetil)oksolan)dihloropaladijum(II)), 2 (bis(2-(fenilselanilmetil)oksan)dihloropaladijum(II)) i 3 (bis(2) ,2-dimetil-3-(fenilselanil)oksan)dihloropaladijum(II)) su korišćeni za ispitivanje reaktivnosti ovog specifičnog tipa kompleksa prema različitim bio-molekulima. Ovaj sistem je od posebnog interesa jer se jako malo zna o supstitucionim reakcijam organoselenijum paladijum(II) kompleksa sa trans konfiguracijom. Zamena koordinovanog hlorida sa serijom malih bio-molekula (l-Met, l-His, l-Cis, GSH i 5′-GMP) proučavana je pod uslovima pseudo-prvog reda kao funkcija koncentracije nukleofila i temperature korišćenjem tehnika zaustavljenog toka. Rezultati za proučavane komplekse ukazuju da ...
    Pd(II), Selen, Substitucija, Kinetika, Mehanizam

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... correction, and 91500 standard zircons (Wiedenbeck et al. 1995) were used as unknown to correct systematic error. Reference material NIST610 was used as standard material for trace elements. Data reduction was processed through Iolite software v2.5 (Paton et al. 2011), applying down-hole fractionation ...
    ... ruptures, which have reached the bottom of the lithosphere triggering the melting of the upper lithosphere, previously metasomatized by crustal material (Cvetković et al. 2004, 2014; Prelević et al. 2005). This trigger produced volcanic activity with elevated potassium content in the Miocene, in ...

  • LRMI markup of OER content within the BAEKTEL project

    Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić (2015)
    ... Core, plus additional terms from LOM and Dublin Core. The metadata schema Schema.org defines the metadata schema for basic information about material on the Web, such as a “Creative Work” in the form of a “Book,” which has metadata like author, publisher, datePublished, etc. It also defines ...
    ... machines make sense of the data on web pages, interrelate it, and ultimately enable more adaptive learning environments for students. So the more material we tag with detailed microdata, the more “findable” our content and educational resources will be for teachers and students. The solution ...

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

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... customer demands. However, when the 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 ...
    ... STOCKYARD SIZE AS A FUNCTION OF COAL RECLAIMING METHOD Just as there are several stacking methods, there are also several methods for reclaiming material from stockyards. The reclaiming method does not greatly affect the size of the homogenization stockyard, since most of the activities of importance ...

  • Towards translation of educational resources using GIZA++

    Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević (2016)
    ... information about translation offerings in the coming months. In this phase, course lectures are translated via subtitles while all other course material, including quizzes and assignments, are in the source language. Coursera welcomes at the moment 145 partners across 28 countries offering over ...
    ... and is used in this research, and a comparison of results is in progress. Machine translation research using Giza++ and is usage for eLearning material is in its initial phase, but it is clear that the most effective way of translating is obtained using all three methods of translation (Computer ...

  • New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)

    Nevenka Đerić, Nataša Gerzina (2014)
    Gornja kreda, radiolarije, Jadar blok, zapadni pojas Vardarske zone, zapadna Srbija
    ... area.The inset to the right shows the column interval studied for radiolarians, with the sample locations indicated. The micropaleontological material is housed at the Faculty of Mining and Geology in Belgrade (registration numbers BR 1/1, BR 1/2 and BR 1/3). 4.SECTION DESCRIPTION AND BIOS ...
    ... Late Jurassic obduction and subsequent erosion in the Dinaridic-Hellenic belt, Cretaceous synorogenic basins were formed and filled with clastic material composed of variable amounts of ophiolitic, terrigenous and carbonate detritus (LUŽAR-OBERITER et al., 2012). Therefore, the obducted ophiolitic ...

  • 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 ...
    ... those in bitumen of raw samples, which is reflected through the increase of lower homologues. In addition to the fact that the distribution of n-alkanes depends on maturity changes that particularly occur in the CS pyrolysis, it also depends on the kerogen precursor material. The prevalence of lower ...
    ... 1University of Belgrade, Serbia, 2RWTH Aachen University, Germany The 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 ...
    ... abundances of odd and even homologues, resulting in a reduction of the CPI values (~ 1) in relation to the bitumen (1.37–1.87). In initial bitumen of both raw samples, the pristane/phytane (Pr/Ph) ratio is similar (< 0.4). In LPs from the OS the values of Pr/Ph are 1.23 and 1.74. That might be explained ...

  • Arhitektonsko-građevinski kamen Crne Gore, stanje i potencijali

    Darko Božović, Vladimir Simić (2023)
    arhitektonsko-građevinski kamen, rezerve, kvalitet, potencijalnost

  • The Dictionary of the Serbian Academy: from the Text to the Lexical Database

    Ranka Stanković, Rada Stijović, Duško Vitas, Cvetana Krstev, Olga Sabo (2018)
    In this paper we discuss the project of digitization of the Dictionary of the Serbo-Croatian Standard and Vernacular Language. Scanning and character recognition were a particular challenge, since various non-standard character set encoding was used in the course of the almost 60-year long production of the dictionary. The first aim of the project was to formalize the micro-structure of the dictionary articles in order to parse the digitized text of and transform it into structured data stored in relational lexical database. This approach ...
    computer lexicography, lexical database, language resources, dictionary, Serbian language
    ... considered (Vitas & Krstev, 2015; Ivanović et al. 2016). The digitization (which is also the topic of the present paper) of the published volumes and raw materials (lexicographic leaflets) began in 2016, and the first use of the two volumes that were 1 Упутство за обраду Речника, Београд: Институт за ...
    ... Arts, was published in 1959 in paper form. Out of 35 planned volumes, 19 volumes have been published with the 20th volume to be re- leased soon. The material used for the dictionary covers written resources of the standard Serbo-Cro- atian language from the beginning of the 19th century to the present day ...
    ... u: S. Ristić i dr. (ed.), Leksikologija i leksikografija u svetlu savremenih pristupa, Beograd: Institut za srpski jezik SANU, pp. 133–154. [The material of the Dictionary of the SANU - the needs and pos- sibilities of digitization in the light of contemporary approaches (in Cyrillic)]. Lemnitzer, ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)

  • An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)

    N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero (2020)
    Paleontology,Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics,Oceanography

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... operational life of sucker rods depends on the quality of the material as well as the working conditions, including: maximum stress, the range of maximum and minimum stress, and the number of strokes per minute. All these factors affect material fatigue and the potential for rod failure,. In some cases ...
    ... of the rod pump. - Hydrodynamic Friction: Between the rod strings and the fluid through in which they move. – Internal Friction: Within the material of the rod strings and tubing, which occurs due to deformation under stress [3,4]. Walking Beam Equalizer Bearing Horsehead — Horsel Equalizer ...
    ... operation under harsh conditions where sand and corrosion are expected, the internal or external surface may be coated with various metals. The cylinder material itself can also vary. Chroming provides very strong resistance to abrasive damage. Nickel-carbide cylinders have a steel base over which a nickel ...

  • Polymorphism and photoluminescence properties of K3ErSi2O7

    Predrag Dabić, Marko G. Nikolić, Sabina Kovač, Aleksandar Kremenović (2019)
    alkalni silikati elemenata retkih zemalja, silikati lantanoida, polimorfizam, fotoluminescencija, kristalna struktura

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... license, and indicate if changes were made. �e images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended ...
    ... Avalanches in Wood Compression. Phys. Rev. Lett. 115, 055501 (2015). 22. Baró, J. et al. Statistical Similarity between the Compression of a Porous Material and Earthquakes. Phys. Rev. Lett. 110, 088702 (2013). 23. Navas-Portella, V., Corral, A. & Vives, E. Phys. Rev. E 94, 033005 (2016) 24. Soprunyuk ...
    ... Avalanches in Wood Compression. Phys. Rev. Lett. 115, 055501 (2015). 22. Bard, J. et al. Statistical Similarity between the Compression of a Porous Material and Earthquakes. Phys. Rev. Lett. 110, 088702 (2013). 23. Navas-Portella, V., Corral, A. & Vives, E. Phys. Rev. E 94, 033005 (2016) 24. Soprunyuk ...

  • Actual contamination of the Danube and Sava rivers at Belgrade (2013)

    Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)
    rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening
    ... samples of 2.5 L were taken from approxi- mately 20 cm below the water surface nearby the river bank and bottled in pre-cleaned flasks. The sample material was stored in the dark at a temperature of approximately 4 °C. Before extraction and TOC determination, all water samples were filtered through ...
    ... sediment samples were taken at the same five sampling loc- ations along the Danube and the Sava Rivers in Serbia (see Table S-I, of the Supplementary material to this paper). Sediment samples from the first two locations on the Sava River (Zabran and Makiš) were taken by means of a Van Veen grab from a ...
    ... non-target analyses indicates to potential misinter- pretation of the real state of pollution by restricted analytical approaches. SUPPLEMENTARY MATERIAL Tables S-I–S-IV are available electronically from http://www.shd.org.rs/JSCS/, or from the corresponding author on request. Acknowledgement. ...

  • A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area

    Filip Anđelković, Dejan Radivojević (2018)
    baden, Beograd, facije, facijalna raznovrsnost, sedimenti
    ... ap of Yugoslavia, Geology of Serbia (Pet‐ ković, 1977) and Geology of the Belgrade and its surroundings (Anđelković M., 1987, 1989a, 1989b).     MATERIAL AND METHODS    The  fieldwork  that  had been  carried  out  in  the Belgrade  area  studied  two  facies:  Tašmajdan  limestones  (so  called  ...

  • English for Geology Students. 2

    Lidija Beko (2023)
    Engleski jezik
    ... prof. dr Juliana Vučo and prof. dr Dragoslava Mićović, demonstrated true faith in me and were extremely helpful with their patient reading of the material, along with their sugge- stions without which this textbook would not have been finalized. I would like to thank dr Marija Đurić, professor at ...

  • Novi pristup proučavanju tekstura minerala značajnih za istraživanje rudnih ležišta

    Aleksandar Pačevski (2022)
    ... Ag-bearing pyrite was prevented, and the porous character of this mineral was emphasized, what underlines the specificity in the conditions of ore material deposition. Further examination of the Fe isotope composition of pyrite by LA-MC-ICP- MS, but on well-defined textural varieties such as colloform ...

  • 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