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4920 items

  • Mogućnost korišćenјa toplotnih pumpi sa otpadnom toplotom iz postrojenјa za prečišćavanјe otpadnih voda kao toplotnim izvorom

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Boban Pavlović (2021)
    U narednom periodu se planira izgradnja nekoliko desetina sistema za prečišćavanje otpadnih voda u većim gradovima u Srbiji. Iskustva iz postrojenja koja su trenutno u radu, pokazuju da bi prečišćena otpadna voda, s obzirom na protok i temperaturu, mogla da predstavlja značajan izvor obnovljive energije. U radu su prikazani primeri dobre prakse korišćenja ove energije u sistemima daljinskog grejanja u zemljama Evropske unije. Analiziran je rad postrojenja za prečišćavanje otpadnih voda u Šapcu i razmotrena je mogućnost njegovog korišćenja ...
    toplotna pumpa, sistem daljinskog grejanja, postrojenje za prečišćavanje otpadnih voda
    ... treated wastewater (taking into consideration available flow and temperature) could be a significant source of renewable energy. The paper presents examples of good practice in the use of this energy source by heat pumps in district heating systems in the EU countries. The operation of the wastewater treatment ...
    ... Šapcu trenutno ne postoji centralni sistem za pripremu sanitarne vode niti centralni sistemi za hlađenje prostora u postojećim zgradama. 0 10 20 30 40 50 60 0 500 1000 1500 2000 2500 3000 3500 h e a t lo a d f o r D H g ri d i n M W hours per year Slika 3. Kriva godišnjeg ...

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... on of ground waters. Geothermics 1983, 12, 141–148. [CrossRef] 43. Milenić, D.; Vasiljević, P.; Vranješ, A. Criteria for use of groundwater as renewable energy source in geothermal heat pump systems for building heating/cooling purposes. Energy Build. 2010, 42, 649–657. [CrossRef] 44. Konstantinou ...
    ... hydrogeothermal resources accumulated in the groundwater of a temperature scope to 30 ◦C which is conditioned by the application of geothermal heat pumps [41], while Veliko Banatsko Selo comes with hydrogeothermal resources accumulated in the groundwater of temperature above 30 ◦C, which means direct ...
    ... these conditions. In order to provide relevant data for calculations, a geological/hydrogeological re- connaissance was carried out, followed by groundwater parameters regime monitoring (temperature, chemical composition, flow capacity). For the purpose of geothermal wa- ter and reservoir characterization ...

  • Improvement of geodatabase queries within GeolISS

    Ranka Stanković (2008)
    ... second section implementation details are presented, while section 3 presents GeolISS search functionalities. Efficient exploration of such a valuable source of geologic data in view of the diversity and amount of archived data, which is of paramount importance for the quality of results obtained by ...
    ... e.g., default description, necessary property description, identifying property description, or instance description. Metadata keep track of data source, links to the bibliography, the person, organization, and project responsible for original data acquisition, and the processing steps involved ...
    ... Search in GeolISS Having in mind the diversity and amount of data archived in GeolISS it is obvious that efficient exploration of such a valuable source of geologic data is of paramount importance, and hence this problem has to be handled very carefully. Spatial queries differ from SQL queries: ...

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... propagation. The standard defines favorable conditions as downwind propagation where the wind blows from the source to the receiver within an angle of +/−45 degrees from a line connecting the source to the receiver and at wind speeds appropriate for a specific project (10 m/s for this SEA), measured at ...
    ... ti o n t o i n cr ea se d n o is e le v el s 0 In units 1 and 2 no increase in the level of noise above LVNI is expected, either for the day/evening, or for the night period. Unit 2-Čantavir west (30 wind turbines) 0 Unit 3-Žednik north (22 wind turbines) L /−2 / V / P ...
    ... Gauss-Kruger coordinate system are given in Figures 2 and 3). Figure 1. Position and spatial organization of the planned Maestrale Ring wind farm. (Source: Google Earth with modifications). According to the concept of the planning document, the wind farm is conditionally divided into four units ...

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • Mathematical modeling to define catchment size and real evapotranspiration (case study: Andrića karst spring, Western Serbia)

    Marina Čokorilo Ilić, Vesna Ristić Vakanjac, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković, Bojan Hajdin (2018)
    Water resources in karst are extremely important sources of drinking water supply. The quality of groundwater formed in karst aquifers is generally high and in most cases only chlorination is required. However, from a hydrogeological perspective, these water resources are the least studied. Often only basic information is available on catchment size, groundwater reserves (dynamic and static, if any) and groundwater balance. Detailed hydrogeological investigations and long-term monitoring of karst spring discharges are needed to acquire such information. In ...
    karstno vrelo, veličina sliva, stvarna evapotranspiracija, karstno vrelo Andrića

  • Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita
    ... information on the rights of access to the digital object in accordance with copyright and intellectual property protection, the source, size and type of files on access to the source, the size and display format, and using them to actively monitor the number of users who visit and use certain content.13 ...
    ... containing over 5500 pages of plain text is created and prepared for publication as an online resource for full text search using Omeka, an open source content management system for on line digital library development. Search capabilities, both full text and metadata search are customized and improved ...
    ... fields that are compliance with Dublin Core, a standard used by libraries, museums and archives. This additional layer helps in establishing proper source attribution, standards for description and organization of digital resources as important aspects of scholarly work in the classroom settings but ...

  • LRMI markup of OER content within the BAEKTEL project

    Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić (2015)
    ... including metadata schema and implementation of LRMI metadata. In section 5 is given short description and architecture of Open edX, as the open source platform mailto:ranka.stankovic@rgf.bg.ac.rs file:///D:/ranka/MojiDokumenti/radovi/Radovi2015/eLearning/apstrakti/daniela.carlucci@unibas.it mailto:ranka ...
    ... BAEKTEL Metadata Portal (BMP). All project partners develop and publish their OER on http://edx.baektel.eu/, which is build using edX, an open- source online learning platform. BMP is providing all important information on the network resources, thus enabling their search and browse. [7] ...
    ... that the LMS uses  Course Browsing, as a simple front page for browsing courses (edx.org site home page and course discovery site is not open source). Units of course are called XBlocks and users can create new types of XBlocks, but there are other ways to extend courseware behavior like: ...

  • Challenges in using wastewater heat pumps in district heating systems

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović, Dimitrije Manić (2022)
    Decarbonization of district heating systems requires ensuring significant amounts of renewable energy available in the proximity of the district heating network. One of the promising solutions is the utilization of purified water from wastewater treatment plants by heat pumps. However, as a heat source, wastewater treatment plants are characterized by annual variability of the flow and temperature of purified water. The consequence is the variability of recoverable heat potential. In this paper, the effect of variability is analyzed for ...
    Toplotna pumpa, Daljinsko grejanje, Postrojenje za prečišćavanje otpadnih voda

  • Preliminary impact assessment of No2 emission from a heating plant on air pollution: case of Zemun, Serbia

    Boban Pavlović, Uroš Pantelić, Marija Živković, Dejan Ivezić (2023)
    The aim of this paper is to provide a preliminary evaluation of the impact caused by NO2 emissions from a heating plant on the local air quality. To model the spatial distribution of NO2 emissions from the heating plant, the AERMOD model was employed. The evaluation was conducted by analyzing and contrasting the simulated NO2 concentration from the heating plant with the overall NO2 concentration recorded at the nearest monitoring station over the entire heating season. The study focused ...
    AERMOD, квалитет ваздуха, моделирање дисперзије загађења, топлана, NO2 загађење

  • Against the tide: southeast to northwest shelf-edge progradation in the southeastern margin of Lake Pannon, Banat (Serbia and Romania)

    Dejan Radivojević, Miloš Radonjić, Lajos Tamás Katona, Imre Magyar (2022)
    In the late Neogene, the Pannonian Basin in Central Europe was filled with sediments when rivers from the Alps and Carpathians shed their sediment load into Lake Pannon. The most powerful source-to-sink system was that of the paleo-Danube, transporting sediments from the NW as far as the southeastern part of the lake. In the southeastern margin of the basin, however, local sedimentary systems worked in the opposite direction, against the “tide” of the prevailing N to S sediment transport. ...
    General Earth and Planetary Sciences

  • Filling of dolines with aeolian sediments in the high-mountain karst of the Dinarides (Mt. Durmitor, Montenegro)

    Mirela Djurović, Violeta Gajić, Predrag Djurović (2022)
    Filling of dolines with aeolian sediments, one of the less frequently described ways in which they are filled, is analysed in the present study on an example of a doline in the high-mountain karst of the Dinarides. There is a series of deep dolines on a broad ridge (about 2450 m a.s.l.) on Mt. Durmitor (Montenegro) in the southeastern part of the Dinarides. The accumulation of very fine-grained sand that almost completely fills one of the dolines was analysed. ...
    Doline, Zapuna, Eolski sedimenti, Karst, Dinaridi, Crna Gora

  • Integrated energy planning approach for accelerating energy transition of households

    Boban Pavlović, Marija Živković, Dejan Ivezić (2023)
    The success of energy transition planning depends on several influential and variable factors that need to be considered and tracked in modeling to support policymakers. Expert-based energy models are mainly developed following the assumptions of experts and, in most cases, a limited number of stakeholders. This top-down modeling approach will provide satisfactory results in centrally managed energy sectors (electricity generation and distribution, district heating, etc.), where further decisions could be projected relatively precisely. However, the same approach will not ...
    Energetsko planiranje, Integrisano energetsko modeliranje, Energetska tranzicija, Domaćinstva, Individualno grejanje, LEAP

  • The impact of temporal variability of groundwater levels on groundwater vulnerability maps in karst terrains – a case example of the Perućac spring catchment area

    Vladimir Živanović, Igor Jemcov, Nebojša Atanacković (2022)
    Groundwater vulnerability maps represent an essential tool for protecting karst groundwater resources. Vulnerability assessment is usually based on spatial evaluation of various parameters that affect the vulnerability degree and regulate the protection role of the unsaturated zone. Most of these parameters, like soil and geology conditions, are constant and do not change during the year or over several years. In contrast, some parameters, such as the groundwater level, depend on the variability of recharge conditions. By considering the variability ...
    karst groundwater vulnerability maps, parameter changes, Perućac spring, Serbia

  • Hydrochemical indicators of groundwater flow in the area of “Čukaru Peki” Cu-Au underground mine in eastern Serbia

    Nebojša Atanacković, Vladimir Živanović, Jana Štrbački, Veselin Dragišić, Ivana Cvejić (2022)
    The physical and chemical properties of groundwater, together with the groundwater levels regime and rock hydraulic properties, are often used to understand and conceptualize the hydrogeological system. Prediction of the influence of mining works on groundwater, and vice versa, is a challenge due to significantly altered groundwater flow patterns in the raw materials exploitation areas in relation to natural conditions. Therefore, multiple parameters are assessed and monitored before and during exploitation to properly characterize and quantify the system for ...
    mine water, hydrogeology, multivariant statistics, groundwater inflow, water quality

  • Режим изданских вода карстног платоа Бабине (ЈЗ Србија, Пријепоље)

    Бранислав Петровић, Вељко Мариновић, Зоран Стевановић, Саша Милановић, Љиљана Васић (2021)
    карст, подземне воде, трасирање, Пријепоље

  • Stochastic Prediction of Temporal Variations of Karst Groundwater Regime in Function of Sustainable Management: Case Study Mokra Karst Spring (SE Serbia)

    Veljko Marinović, Branislav Petrović (2021)
    karst groundwater, stochastic model, water quality, early warning system

  • Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US

    Uroš Djorgovski, Aleksandar Madžarević, Predrag Jovančić (2023)
    Even in the third decade of the 21st century, large power plants are still responsible for more than half of the electricity production in Europe and US. They predominantly use fossil fuels in their work, which results in the emission of pollutants into the air, soil and water. In addition to the production of electric energy, fossil fuels, including coal, are used for industrial purposes. Although the use of coal, especially in the countries of the European Union, is ...
    CO2, емисија, угаљ, термоелектрана, САД, ЕУ-27
    ... j US average: 13061 kWh/c 12000 j 10000 j 8000 j EU-27 average: 6492 kWh/c 6000 4000 j 2000 j ——LFU-27 <——=US 0 eo w i e T T n o u 00 miuČ- O T W i m TO O ~ 0 O O a eNeon E:o:u: ' o e i e oč reeo oeezkžjjBNj“”oZo S Wwe e esA Č e!đ e RT NTe ı ...
    ... 1000 _ 500 _ Pa rt ic ip at io n of co al in el ec tr ic it y pr od uc ti on [% ] NE-U- .F T.E B SB- OB OB .BO""BS OB :Ba"0"| a aBšš e )0)00] 95 2855d45S E I I I 2R IR e a 88,868888B8B8aBaaBBSB BBB BSBaVBT.a s eee q a tc
    ... RRRR RSRRRRRRRSRSSSSSE Figure 1. Coal production in EU-27 and US At one time, coal had the greatest importance in the EU-27 countries as an energy source for obtaining electricity. In 1990, the share of coal in the production of electricity was 36,7%, while in 2021 this share was only 14,8% [4]. ...

  • Development of Open Educational Resources (OER) for Natural Language Processing

    Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević (2015)
    In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...
    E-Learning, Open Educational Resources, Computational Linguistics, Lexical Resources, edX
    ... UNITEX - OPEN ACCESS, OPEN SOURCE, OPEN EDUCATIONAL RESOURCES The course participant will become familiar with the use of Unitex, the corpus processing system for which many valuable resources for Serbian have already been developed. Unitex 11 is an open source system consisting of a collection ...
    ... development within BAEKTEL project of its OER version within the edX BAEKTEL platform. 2 The main features of Unitex, an open access and open source corpus processing system, are presented in Section 4. Section 5 presents course content with didactic criteria and specific formats used in the ...
    ... Lesser General Public License (LGPL). This means that everyone can redistribute Unitex freely within the terms of the LGPL license, access the source code of all Unitex modules and reuse it. 5. LEXICAL RECOGNITION IN NLP Course content The main topic of the presented course 12 is natural ...

  • 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 ...
    ... and the Pr/Ph ratio is observed. Therefore, OS pyrolysis can be useful for assessment of source and depositional environment of OM. Pyrolysis in the CS caused more intense thermal stress; therefore the source fingerprints notably disappear. The obtained results indicate that n-alkan-2-ones and fatty ...