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Упит dcterms_creator_txt:Kounov A.

1304 items

  • Допринос одређивању безопасног растојања при извођењу минирања

    Slobodan Trajković, Sanja Bajić, Ivan Krsmanović (2023)
    минирање, експлозија, потреси од минирања
    ... XHJIpOKCHJIHMa TBO:>I}a. #+ „HuHcehepckO - 20O0J0LMKe Kapakmepucmuke jecuuwama — OBe CreHc npHnajajy IpyrnM Be3aHHMX CTCHa, KOJC Cy HHTC3HBHO HcIyIaHc H KapcrTHQ)MMKOBaHe. HcenarTHBaMbeM je yTBPpleHOo a Cy yCJIOBH 30 paji, Kao H BHIHCTOJHIHH4 CKcIIJOATALIHJA jc moKa3aa a Cy HH)KEHbCDpCKO- ...
    ... 3anrTHTe OKOJIHHX rpabeBHHcKHX O0jeKaTa KOJI yrBpbHBaba OesomacHor · pacrojaba · H MaKCHMaJIHEC KOJIHUHHC CKCIIIO3HBa KOJa CČ MOXKC aKTHBHpaTH a a HeMa OmrrehePa Ha rpabeBHHCKHM O0jeKTHMa. KijbyuHe peuM: MHHHpabć, CKCIJIO3HJA, TIOTpecH 0JI MHHHPpahba. 1. YBOJI Koji B3Boljeba MHHHPpaMb5a ...
    ... , THM IIpe mro y CpOujH jomi yBEK He mMNOCTOJE 173 ABSTRACT This paper elaborates the problems connected with establishment of a safety distance paying a particular attention to unfavorable effects occurring during blasting. One of these unfavorable effects refers to seismic activity caused ...

  • 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
    ... should not be used as a household fuel” [12]. However, a relatively high amount of low-rank coal in addition to thermal power plants is used in households (for cooking and heating), particularly in Serbia, India, and China [13,14]. Numerous studies were performed on lignite pyrolysis as a method for its improved ...
    ... ons were carried out on lignite or bituminous coal having a low ash (4–12%, dry basis) and relatively high carbon content (62–84%, dry, ash-free bases) [33,35,36], not on low-quality lignite with a high ash content (>40%) and, consequently, a low calorific value (net calorific value <15 MJ/kg). Our ...
    ... lignite/HDPE co-pyrolysis as a possible method for utilization of lignite of extremely low quality (ash content > 40%; organic carbon content <30%). The objective was to examine and confirm the existence of a synergetic effect during low-quality lignite and HDPE co-pyrolysis, using a wide range of methods, ...

  • LRMI markup of OER content within the BAEKTEL project

    Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić (2015)
    ... providing a vocabulary for semantic markup. The most prevalent of these standards are Microformats, which use style definitions to annotate HTML text with terms from a fixed set of vocabularies; RDFa which is used to embed any kind of RDF data into HTML pages, and Microdata, a recent, currently ...
    ... Schema.org provides a collection of microdata schemas, i.e. HTML tags that can be added to web pages to describe the things their pages are about. Schema.org was launched in 2011, as a joint initiative of Google, Yahoo, Microsoft Bing, Yandex and W3C. Schema.org provides a collection of schemas ...
    ... GLC is that the choice of a standardized learning object metadata vocabulary has valuable and beneficial institutional and pedagogical implications. When a large amount of OER is reached, it is even more important that they are well described and tagged in a standard way in machine readable ...

  • Business Models for Small-scale Biomass Projects Development

    Dejan Ivezić, Miodrag Gluščević, Marija Živković (2019)
    Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...
    ... buildings. The system has been operating since 2007 as a part of the Public Utility Company (PUC) “BB term” from Bajina Bašta. A boiler plant is located in the local schoolyard. The biomass project is given in detail in [4 - 6] and it includes a fuel switch to biomass, i.e. wood chips. Based on an increased ...
    ... installation of new biomass boilers instead of a refurbishment of the existing oil boilers is planned. The total annual space heat demand was assumed to be around 8,842 MWh/a. The total connected consumer peak load is 1.4 MW. For the existing DH grid with a trench length of 2,900 m, losses of 25% of heat ...
    ... was shown in [4] that a new biomass DH system is economically advantageous compared to a refurbishment of the existing fossil-fueled DH system. In addition, the new biomass DH system, compared to the refurbished fossil-fueled DH system, avoids the thermal utilization of 2.65 GWh/a of heavy fuel oil and ...

  • Uniaxial compressive strength test before and after standard fire test on rock mass

    Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)
    ... cemnet with a clayey component, and fine-grained quartz which can be seen in some parts. The rock color (black) is most likely a consequence of the presence of divalent (ferro) iron. In Figure 1 is shown a microscopic image of rock sample. Figure 1. Microscopic image of a rock sample; ...
    ... is performed on a hydraulic press. A total of 6 samples (1-6) are tested and uniaxial compressive strength is determined. The same 6 samples (7-12) are placed in a furnace that simulates effect of fire. After that, the compressive strength of 6 samples (7-12) from furnace on a hydraulic press ...
    ... RESEARCH 2.1. Material characterization, microscopic description Rock has a clastic, psammitic texture. It is made of quartz clast, fragments of rock minerals and mica (muscovite and chlorite) which are bound with a limonite clay cement. Quartz clusters dominate, building about 60% of the rock ...

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • Geochemical study of U, Th and REE mineralizations in Jurassic sediments and hydrochemical characterization of groundwaters in Eastern Serbia – Case study: Plavna area

    Jovan Kovačević, Maja Todorović, Marina Ćuk, Petar Papić (2016)
    jurski sedimenti, uran, torijum, elementi retkih zemalja, podzemna voda, istočna Srbija

  • Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera

    Aleksandra B. Kolarski (2016-08-25)
    Radio talasi vrlo niskih frekvencija VLF (eng. Very Low Frequency) frekventnog opsega od 3 do 30 kHz, koji se prostiru talasovodom Zemlja-jonosfera (50 -90 km) su, kao što je poznato, efikasni i nezamenljivi u osmatranju pojava u niskoj jonosferi, sa tla...
    prostiranje talasa vrlo niskih frekvencija, talasovod Zemlja-jonosfera, globalno električno kolo, atmosfersko električno pražnjenje, kratkotrajne svetlosne pojave
    ... a) GQD/22.1 kHz b) DHO/23.4 kHz c) ICV/20.27 kHz d) HWU/18.3 kHz e) FTA/20.9 kHz f) NWC/19.8 kHz g) NAA/24.0 kHz h) NDT/22.2 kHz Slika 5.1.1.1. Trase signala emitovanih ka Beogradu iz: a) Skelton-a, b) Rhauderfehn-a, c) Isola di Tavolara-e, d) Rosnay-a, e) Sainte-Assise-a, f) ...
    ... 1996). Snimci halo-a praćenog sprajtom i halo-a koji se javlja bez sprajta (eng. “spriteless halo”, Bering et al., 2004) prikazani su na Slici 2.2.3. a) b) Slika 2.2.3. Snimci različitih tipova halo-a: a) karot sprajt sa ...
    ... C. P., Inan, U. S., Stanley, M., Cummer, S. A., Sprites triggered by negative lightning discharges, (1999). Geophys. Res. Lett., 26 (24), pp. 3605-3608. Bedard Jr., A. J., Lyons, W. A., Armstrong, R. A., Nelson, T. E., Hill, B., Gallagher, S. (1999). A search for low-frequency atmospheric acoustic ...

  • Development of a petrographic classification system for organic particles affected by self-heating in coal waste. (An ICCP Classification System, Self-heating Working Group – Commission III)

    M. Misz-Kennan, J. Kus, D. Flores, C. Avila, Z. Büçkün, N. Choudhury, K. Christanis, J.P. Joubert, S. Kalaitzidis, A.I. Karayigit, M. Malecha, M. Marques, P. Martizzi, J.M.K. O'Keefe, W. Pickel, G. Predeanu, S. Pusz, J. Ribeiro, S. Rodrigues, A.K. Singh, I. Suárez-Ruiz, I. Sýkorová, N.J. Wagner, D. Životić (2020)
    Self-heating of coal waste is a major problem in the leading coal-producing and consuming countries, independent of the recent or past coal exploitation history. The phenomenon of self-heating is dependent on many factors such as the properties of organic matter (maceral composition and rank), moisture and pyrite content, climate effects, and storage conditions (shape of the dump or compaction of the coal waste). Once deposited, coal waste undergoes oxidation, which can lead to self- heating with the overall temperatures ...
    Stratigraphy,Economic Geology,Geology,Fuel Technology

  • Open Educational Resources in Serbia

    Ivan Obradović, Ranka Stanković, Marija Blagojević, Danijela Milošević (2020)
    Open educational resources, BAEKTEL, Metadata portal
    ... Open Education Initiative, founded by a group of university teachers, and intended for all those who work in education and share the view that knowledge is a common good and that it should be available for everyone (http://oer.rs/) The portal is developed as a WordPress platform with metadata about ...
    ... institutions and industry in order to develop quality OERs. This partnership gave a successful example for further cooperation in the OER domain. Sharing and reuse of OER could also be a measure of outcome. As Serbia is a country with few years’ experience in OER implementation, some BAEKTEL OERs were ...
    ... OERs as a good pool of best practice examples. With raise of OER in Serbia the global community has become a stakeholder for created OERs. National community is organized through the well-known initiatives like Serbia's Open Education Initiative (oer.rs). The Initiative provides a platform ...

  • 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

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... трансфомацији из P21/a у A2/a просторну групу постају уже. 4000 3500 3000 2500 2000 1500 1000 500 0 10 20 30 40 50 60 70 80 90 100 435 473 562 633 705 675862 T ( % ) cm-1) 373 A2/a P2 1 /a Слика 4.3.5.1. Инфрацрвени спектри а) сфена30 (P21/a) и б) сфена5 (A2/a) након синтеровања ...
    ... анатаса у рутил. 20 40 60  ° a cc cc c c c c c cc ccr r r a a 120 min 60 min 30 min 15 min c - CaCO 3 a, r - TiO 2 a r c Слика 4.1.4.1. Дијаграми механички активираних прахова сфен15, сфен30, сфен60 и сфен120. Симболи: с - СаСО3, док a и r представљају полиморфне модификације ...
    ... 86(3) 113,86(2) 113,90(3) Запремина јединичне ћелије (Å3) * 370 368,49(6) 370,12(5) 370,22(6) 365,88(5) Просторна група A2/a (C2/c) A2/a P21/a P21/a P21/a Израчуната густина (g/cm3) 3,53 3,52 3,52 3,56 локалитет Lindviksollеn, Norway Zillertal, Italy синтетички синтетички ...

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... трансфомацији из P21/a у A2/a просторну групу постају уже. 4000 3500 3000 2500 2000 1500 1000 500 0 10 20 30 40 50 60 70 80 90 100 435 473 562 633 705 675862 T ( % ) cm-1) 373 A2/a P2 1 /a Слика 4.3.5.1. Инфрацрвени спектри а) сфена30 (P21/a) и б) сфена5 (A2/a) након синтеровања ...
    ... анатаса у рутил. 20 40 60  ° a cc cc c c c c c cc ccr r r a a 120 min 60 min 30 min 15 min c - CaCO 3 a, r - TiO 2 a r c Слика 4.1.4.1. Дијаграми механички активираних прахова сфен15, сфен30, сфен60 и сфен120. Симболи: с - СаСО3, док a и r представљају полиморфне модификације ...
    ... 86(3) 113,86(2) 113,90(3) Запремина јединичне ћелије (Å3) * 370 368,49(6) 370,12(5) 370,22(6) 365,88(5) Просторна група A2/a (C2/c) A2/a P21/a P21/a P21/a Израчуната густина (g/cm3) 3,53 3,52 3,52 3,56 локалитет Lindviksollеn, Norway Zillertal, Italy синтетички синтетички ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... oWns is a model of underwater camera for wells with a rotating lens. The CKH has: a camera for recording exploratory wells with a small diameter of up to 50 mm to a depth of 300 m, 4 vertical cameras (diameter 50-70 mm) with high resolution for recording to depths of 300 and 500 m and a camera ...
    ... Zlatibora i Cačka do Beograda. Direktor IRCK-a, Jiang luchi i dr Cao Jianhua boravili su u Beogradu od 15. do 18. juna, kao gosti CHK-a. Tokom njihovog boravka organizovan je prijem od strane Dekana RGF-a i sastanak tokom kojeg su članovi IRCK-a i CHK-a izlagali svoje aktivnosti i aktuelne projekte ...
    ... oooiaaaaaa diii 29 Publications of Centre for Karst Hydrogeology.......caaaaaaaaaaa a aaeanaaniaanaaee— 29 Terenska oprema CHK ........aaaaaaaa a enad n ao a iioaroieoiadatttı 34 Field equipment CKHi.......ć.aaaaaaaaaaaaaa a aaaeaeaaiaa eiaaeialiaaei iii akaaaakiakapiaaiakiakabaaeka 34 Članovi Centra ...

  • Contribution to the geotechnical classification of municipal waste landfills in Serbia

    Dragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić (2018)
    Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental Engineering

  • An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction

    Dejan Ćebić, Nebojša Ralević, Marina Marčeta (2020)
    нелинеарна једначина, 16.ред конвергенције, оптималне методе, подељене разлике

  • Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia

    Maja Milošević, Mihovil Logar, Biljana Đorđević (2021)
    ... minerals. A total of three vessels were analysed, broken down by type of workmanship: coiling technique (traditional handmade clay pot made by coiling on a hand-turned wheel) marked -1-; wheel throwing (on a wheel with an electric drive) marked as -4- and by moulding (application of a mould) marked ...
    ... traditionally (wood-fired oven), stands out. A microscopic examination of the thin sections revealed a uniform mineral composition and porosity. For sample -5- a specific fluid-structure is consistent with the way it was introduced by the application of a mould. The measurements of moisture absorption ...
    ... territory of Serbia. What makes it a unique phenomenon, in technological terms, is the fact that with the discovery of new techniques and production processes, the old ways, already adopted and mastered continued to live and actively coexist until today. This also brings a rise in imitations of pottery ...

  • Hydrogeochemistry of Uranium in the Groundwaters of Serbia

    Marina Ćuk, Maja Todorović, Petar Papić, Jovan Kovačević, Zoran Nikić (2015)

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... Energy security is a parameter whose specificity lies in the influence of many factors, so it is not possible to define a unique methodology for determining it [1]. Namely, each country brings into consideration some specificity and its own approach to energy development. Defining a methodological ...
    ... actively promoted, is energy security. Energy security is a synthesis of the geopolitical and energy aspects of energy availability in various forms in satisfactory quantities and at affordable prices. Energy security as indicator is described with a group of synthesis indicators. It is necessary to c ...
    ... essential indicator. Energy security is a top priority issue for rapidly developing countries and, in energy terms, the demand for available energy is growing intensively [7]. In general, energy security is inextricably linked to the national security of a country and as such, can be considered ...