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Упит dcterms_subject_txt:Insulating properties

364 items

  • Analiza uporednog praćenja temperature površine ohlađenih materijala pri njihovom zagrevanju do ambijentalne temperature

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Katarina Nestorović (2021)
    U datom eksperimentalnom radu su termografskim metodama ispitivane termofizičke karakteristike različitih materijala. Za ispitivanja su izabrani mesingani niovčić, ugalj i pelet, jer imaju različita termoizolaciona svojstava i različito stanje površine. Uzorci su najpre hlađeni, a zatim je njihovo zagrevanje na sobnoj temperaturi praćeno termalnom kamerom. U drugom delu eksperimenta, korišćena je impulsna termografija, a zagrevanje površine uzoraka vršeno je svetlosnom pobudom.
    termografija, impulsna termografija, nedestruktivno testiranje materijala, mesing, ugalj, pelet

  • Split-Desktop software for the analysis of fragment size distribution of blasted rock mass

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)
    Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...
    Split-Desktop softver, drobljenje stena, miniranje, analiza, digitalna obrada fotografija

  • 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

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... emission requirements. Coal quality control between the mine site and the utility plant is a complex problem owing to the variable nature of coal properties (heating value, sulfur, ash), even within the same coal seam. Due to the fluctuation of the coal quality, mine planning and coal homogenization are ...
    ... produced and emissions, utilities had no economic interest in monitoring or managing coal quality. It is preferred that feeds the plants coals whose properties, especially that of calorific value, conform to the power plant design and whose sulfur content meets the sulfur emission re- quirement after ...
    ... 2014, Vol. 18, No. 4, pp. 1361-1372 1361 * Corresponding author; e-mail: dstevanovic@rgf.bg.ac.rs source because of the variable nature of coal properties. Homogenization of coals from different working benches within the single mine or even more mines are therefore becoming mandatory not only from ...

  • English for Geology Students. 1

    Lidija Beko (2023)
    Engleski jezik
    ... OM .. NN cg 16 Reading Comprehension...........i cc 20 Part2 PHYSICAL PROPERTIES ............ta tt a 22 VM(eyeP-Uylyar .00 o aG D JIO OGG OO O BO D 0 24 Reading Comprehension...........i .. 27/ Part3 CHEMICAL PROPERTIES ...........vt e 28 Mocabulanya. .0 . O -aOP - -- -PN.)B /. .|.A O a . - ...

  • Sinteza i strukturna karakterizacija novih cezijumskih i kalijumskih silikata sa elementima retkih zemalja

    Predrag Z. Dabić (2022)
    Predmet i ciljevi naučnog istraživanja ove doktorske disertacije su sinteza i strukturna karakterizacija novih cezijumskih i kalijumskih silikata sa elementima retkih zemalja. Istraživanja su izvedena u okviru sistema SiO2–REE2O3–XF, gde REE predstavlja trovalentni katjon elementa retkih zemalja (Sc, Y, Sm, Eu, Gd, Ho, Er, Tm, Yb, Lu), dok X predstavlja jednovalentni katjon alkalnih metala (K, Cs). Rad na disertaciji bio je fokusiran na sintezu monokristala, određivanje kristalnih struktura, kao i na kristalografsko i kristalohemijsko ispitivanje sintetisanih monokristala. Monokristali su sintetisani ...
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu, elementi retkih zemalja

  • The Nooj System as Module within an Integrated Language Processing Environment

    Ranka Stanković, Duško Vitas, Cvetana Krstev (2008)
    NooJ, electronic dictionary, lexical resources
    ... corresponding transductor labeled Knnn. A set of optional tags +SinSem follows, which describe the syntactic, semantic, derivational and other properties of the lemma (Courtois & Silberztein 1990). The WS4LR module has been developed to enable the entry, editing and review of lemmas of simple ...
    ... and then editing an existing lemma, which in some cases facilitates the work. The regular expression or a FST graph describing the inflectional properties of the selected lemma can be inspected and corrected if found inadequate. The FST can also be applied to a lemma, and the user can inspect the ...
    ... is also an edit view for the synset which allows the user to modify the synset contents: word-sense pairs, definition, usage, but also other properties, such as semantic relations to other synsets. In the hypernym/hyponym view, the user can easily navigate through its hypernym/hyponym tree and ...

  • Multiword Expressions between the Corpus and the Lexicon: Universality, Idiosyncrasy and the Lexicon-Corpus Interface

    Verginica Barbu Mititelu, Voula Giouli, Kilian Evang, Daniel Zeman, Petya Osenova, Carole Tiberius, Simon Krek, Stella Markantonatou, Ivelina Stoyanova, Ranka Stankovic, Christian Chiarcos (2024)
    Predstavljamo trenutne aktivnosti na definisanju interfejsa leksikona i korpusa koji će služiti kao referenca u prikazu polileksemskih jedinica - višečlanih izraza - (različitih tipova - imenskih, glagolskih, itd.) u specijalizovanim leksikonima i povezivanju ovih unosa sa njihovim pojavljivanjima u korpusima. Konačni cilj je korišćenje ovakvih resursa za automatsko identifikovanje višečlanih izraza u tekstu. Uključivanje nekoliko prirodnih jezika ima za cilj univerzalnost rešenja koje nije usredsređeno na određeni jezik, kao i prilagođavanje idiosinkrazijama. Raspravljaju se izazovi u leksikografskom opisu višerečnih ...
    multiword expression lexicon, corpus, proof-of-concept lexicon encoding

  • Синтеза, структурне и магнетне особине Ca1-xGdxMnO3 нанопрахова

    Milena Rosić (2014-12-05)
    У оквиру ове докторске тезе, испитиване су оптималне методе за добијањенанопраха – калцијум манганског оксида допираног јонима гадолинијума. Циљистраживања је испитивање одговарајућих прекурсора који су подесни да седобију чисти нано прахови манганита са перовскитском структуром, као имонофазни чврсти раствори са перовскитском структуром. Као подесан методкоришћена је модификована глицин нитратна метода, а од прекурсора нитрати иацетати одговарајућих метала. Модификација глицин нитратне методе се односина делимичну замену нитрата ацетатима, чиме је ублажена бурност реакције.Испитан је различити однос прекурсора, који дају наночестичне ...
    Наноструктурни материјали, Оксиди, Термална анализа,Рендгенструктурна анализа, Магнетна мерења.
    ... structural and magnetic properties of Ca1- xGdxMnO3 nanopowders Milena Rosić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Синтеза, структурне и магнетне особине Ca1-xGdxMnO3 нанопрахова;Synthesis, structural and magnetic properties of Ca1-xGdxMnO3 nanopowders ...
    ... stability, structure and thermoelectric properties of CaMn1-xNbxO3 phases, Acta Materialia 57, 5667–5680. Bose, E., Karmakar, S., Chaudhuri, B. K., Pal, S., Martin, C., Hébert, S., Maignan, A. (2007): Correlation of structural, magnetic and transport properties with the tolerance factor in a low-doped ...
    ... rt properties of Ce doped nanocrystalline LaMnO3, Journal of Alloys and Compounds 438, 1–7. Kubo, K., Ohata, N. (1972): A Quantum Theory of Double Exchange. I. Journal of The Physical Society of Japan, Vol. 33, No.1, 21-32 Leslie-Pelecky, D. L. and Rieke, R. D. (1996): Magnetic Properties of ...

  • Sinteza i karakterizacija nanoprahova u CeO2-Bi2O3 sistemu

    Marija D. Prekajski (2014-04-04)
    Nanoprahovi kristalnih faza iz serije čvrstih rastvora u pseudo-binarnom sistemuCeO2-Bi2O3 sintetisani su primenom jednostavne i ekonomične samopropagirajućemetode na sobnoj temperaturi korišćenjem nitrata metala i natrijum-hidroksida kaopolaznih supstanci. Osim krajnjih članova niza, CeO2 i niskotemperaturne polimorfnemodifikacije α-Bi2O3, sintetisani su i čvrsti rastvori nominalnog sastava Ce1-xBixO2-δ,gde je x = 0,1; 0,2; 0,3; 0,4; 0,5; 0,6; 0,7; 0,8; 0,9. Rezultati proučavanja metodomrendgenske difraktometrije na polikristalnom materijalu i ramanske spektroskopskeanalize pokazali su da su sintetisani prahovi sa nižim sadržajem bizmuta (x = 0,1 ...
    nanostrukturni materijali, čvrsti rastvori, CeO2, Bi2O3, rendgenskadifraktometrija praha, Ritveldova metoda, mikrostrukrurna analiza

  • The Rift Sequence Stratigraphy of the Itebej Field (Pannonian Basin, Serbia)

    Saša Ivanišević, Jelena Radišić, Ivana Isić, Dejan Radivojević (2019)
    ... are syn-rift reef complex sediments and pre-rift deep-water turbidites. The syn-rift carbonate reservoir rocks have high-quality petrophysical properties with commercial quantities of heavy to heavy medium paraffin-base crude oil. The seal rock are deep-water syn-rift pelagic sediments and hemipelagic ...

  • Hazardous substances in karst aquifer waters - one of the results of the operational monitoring of groundwater in Serbia

    Zoran Stevanović, Veljko Marinović, Branislav Petrović (2020)
    У циљу оцене стања животне средине и разумевања потенцијалних узрока још раније евидентираног лошег хемијског статуса водног тела подземних вода „Крш–север“, извршенa je хидрогеолошка проспекција шире околине лежишта бакра Мајданпек, која је укључилаистраживање површинског копа, флотационог језера и главних карстних врела и пећина. Имајући у виду да се експлоатационо поље рудника бакра Мајданпек директно граничи са карстном издани и водним телом подземних вода „Крш–север“, параметри квалитета подземне воде су анализирани (in situ и лабораторијски) на два главна карстна врела ...
    Опасне супстанце, карстна издан, бакар, флотацијско језеро, Мајданпек, Србија

  • 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

  • Wordnet Development Using a Multifunctional Tool

    Ivan Obradović, Ranka Stanković (2007)
    In this paper we present a multifunctional tool for manipulating heterogeneous language resources. The tool handles electronic dictionaries, wordnets and aligned texts, and provides for their synchronous use in various tasks. We focus here on the description of the possibilities this tool offers in the development of wordnets. Besides the wordnet module which enables parallel handling of two wordnets, other modules, such as the module for morphological dictionaries and the module for aligned texts, as well as available finite ...
    Wordnet development, language resource integration, HLT tools
    ... This index also gives access to a shared top-ontology that provides a common semantic framework for all the languages, while language specific properties are maintained in the individual wordnets. BalkaNet, a project aimed at developing wordnets for Bulgarian, Greek, Romanian, Serbian and Turkish ...
    ... corresponding transductor labeled Knnn. A set of optional tags +SinSem follows, which describe the syntactic, semantic, derivational and other properties of the lemma. The format of the lemmas for compound words is more complex, but it basically relies on the same principles. The format used ...
    ... or by copying an existing lemma, which in some cases facilitates the work. The regular expression or a FST graph describing the inflectional properties of the selected lemma can be inspected and corrected if found inadequate. An important feature of this module is the ability of retrieving ...

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... (CO), carbon-dioxide (CO2) and the side effects of decomposition of polyethylene-terephthalate (PET). 3.2.1 Asbestos Because of its mechanical properties, asbestos was used in civil engineering from the beginning of the twentieth century. During the 1980’s health consequences were established (a ...
    ... have a waste dump site for the disposal of environmental threatening and industrial waste where asbestos, mineral wool, waste with adsorption properties and ionic masses belong (Environmental protection secretariat, 2008). Because of this kind of assertion, it is not unlikely that during the lifespan ...
    ... is half-crystalline, thermoplastic polyester which is one of the most used varieties of polyester due to its superior mechanical and chemical properties (Supawee and Wanlop, 2014). Primary use of PET containers in everyday life is for water and soft drink packaging, as well as electronics, home ...

  • Unraveling Innerworkings of Magmatic System Beneath the East Pacific Rise 9º50’N

    Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Felix Waldhauser, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Malden R. Nedimović, Juan Pablo Canales, Hélène D. Carton, Javier Escartin, John C. Mutter (2021)
    ... activity is readily observed and monitored for subaerial volcanoes; however, due to inaccessibility, little is known about the dynamics and physical properties of magmatic systems that govern eruptions. Some of the most active magmatic systems operate beneath portions of mid-ocean ridges (MOR), which ...

  • Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides

    Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević (2021)
    ... Repository is available at: www.dr.rgf.bg.ac.rs Call for contributions Clean water and sanitation & Life on land Linking soil mineralogy to soil properties and functions EUROSOIL2020CONT-1798 CHARACTERIZATION OF NATURAL CLAY FROM BOGOVINA (SERBIA) AND POSSIBLE UTILIZATION IN SORPTION OF THE HERBICIDES ...

  • Investigation of Co0.9Ho0.1MoO4 Nanopowders Obtained by Glycine Nitrate Procedure

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... Niš, Serbia *mrosic(ovinca.rs Nanometric size CoooHooiMoO+ powder particles were obtained by applying glycine nitrate procedure (GNP). Powder properties have been studied by DTA, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, Spectroscopy, Field emission scanning electron ...

  • Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7

    Dragoslav Rakić, Zoran Berisavljević, Irena Basarić, Snežana Bogdanović, Jovana Janković (2019)
    Part of E-80 highway that passes through Serbia (from the city of Nis to the administrative border Merdare) is 77 km long. The highway is divided into two sections: the first from Nis to Plocnik (39.4 km long) and the second from Plocnik to the administrative border with Kosovo. The route is designed through a typical plain and hilly terrain in which different geological units are dominant: crystalline schists, neogene sediments of foothills and quaternary sediments in the valley ...
    ... over 2 m in height. Heterogeneity in terms of lithological composition, weathering degree of rocks as well as variable physical- mechanical properties, does not have significant impact on conditions of construction. Category B includes terrains that can be conditionally stable in inadequate ...
    ... heterogeneity in terms of lithological composition, weathering degree and primary alternation of rock mass as well as variable physical-mechanical properties. In these terrains, temporary reduction of safety factor can be caused by short-term and temporarily events. Category C includes terrains ...
    ... on construction conditions has the heterogeneity in terms of lithological composition, weathering degree and variable physical-mechanical properties. 3.2.1. Section: Nis – Prokuplje (km: 0.0-17.2) Section of the highway Nis (south) – Prokuplje (east) from km: 0.0-17.2, is divided in two ...

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... multiple objectives (subproblems) solvable by different methods are encountered; 3) Polymorphism - development of polymorphic systems which display properties of different intelligent methods within a single architecture. Hybrid systems can be classified accordingly, on basis of their functionality ...
    ... minimum itself. The development of a hybrid system usually consists of the following six stages: 1) Problem analysis; 2) Identification of the properties required by an intelligent method in order to solve the given problem, followed by the selection of appropriate method(s); 3) Selection of an ...