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260 items

  • Application of geological strength index for characterization of weathering-induced failures

    Berisavljević Zoran, Berisavljević Dušan, Rakić Dragoslav, Radić Zoran (2018)

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Franković Maja, Novaković Nevenka, Matović Vesna (2014)

  • Application of the geodiversity index for assessment of geodiversity in urban areas: an example of the Belgrade city area, Serbia

    Ilić Marina, Stojković Sanja, Rundić Ljupko, Ćalić Jelena, Sandić Dejan (2016)

  • Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: implication on grindability index

    Životić Dragana, Bechtel Achim, Sachsenhofer Rainhard, Gratzer Rainhard, Radić Dejan, Obradović Marko, Stojanović Ksenija (2014)

  • Reprint of Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: implication on grindability index

    Životić Dragana, Bechtel A., Sachsenhofer R., Gratzer R., Radić D., Obradović M., Stojanović Ksenija (2015)

  • Industrial Waste Heat Potential for Meeting Heat Demand in the Republic of Serbia

    Dejan Ivezić, Marija Živković (2023)
    Finalna potrošnja energije u industrijskom sektoru čini skoro 25% finalne potrošnje energije u Republici Srbiji. Procenjuje se da je 50-70% potrošnje energije u industriji namenjeno proizvodnji toplotne energije u različitim industrijskim procesima. Deo proizvedene toplotne energije se nepovratno gubi kao energija odvedena u okolinu: prenosom toplote kroz zidove procesne opreme, dimnim gasovim, otpadnim vodama itd. Korišćenjem otpadne toplote povećava se efikasnost korišćenja primarne energije i smanjuje ukupna potreba za energijom. Otpadna toplota se može koristiti u samom industrijskom objektu ...
    otpadna toplota, industrija, toplotne potrebe

  • Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone

    Emő Márton, Marinko Toljić, Vesna Cvetkov (2022)
    The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm ...
    Adria–Europe suture, Vardar Zone, Paleomagnetism, Thrusting, Vertical axis rotation

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... Supply”; REACCESS Final Workshop: Brussels, Belgium, 2011. 28. Index of US Energy Security Risk; US Chamber of Commerce: Washington, DC, USA, 2012. 29. Jewell, J. The IEA model of short-term energy security (MOSES) primary—energy sources and secondary fuels. Int. Energy Agency 2011. Available online: https://www ...
    ... formation of an index that will express the degree of risk or level of security of an energy system [21]. Analysis of the current literature shows that the following methodologies are in active and most common use: Herfindahl–Hirschman index [22], S/D index [23], oil vulnerability index [24], import energy ...
    ... techno-economic-social risk [27], index of us energy security risk [28], MOSES—IEA model of short-term review of energy security [29], energy security index developed by the EU Center for Joint Research in Italy [30] and the global energy architecture performance index, proposed by the World Economy forum ...

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... calculated values for the PG1 and PG2 samples were greater than the limiting values for Ra,, (>370 Bq kg '), the o index (I„ >1), the external hazard index (H.. >1) and the internal hazard index (Hi, >1). Those values were approximately twice as high the maximum values recorded after measurement of 265 ...
    ... Mikheev (1957) and the Joint Committee for Powder Diffraction Standards (JCPDS). Whiteness index In order to compare the quality of the samples for utilization in the construction industry, the whiteness index (WI) values of raw phosphogypsum and recrystallized gypsum were measured. The WI was determined ...
    ... recrystallized gypsum. For both phosphogypsum samples, the calculated values for Ra.qyx the a-index and almost all y-indices were higher than the international recommended limits, except for the y-index limit calculated for utilization in road construction. On the other hand, all of the calculated ...

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... sample, which is characterized by a higher abundance of hopanoids than n-alkanes. This is consistent with low Tissue Preservation Index (TPI) and high Gelification Index (GI) (Kus et al., 2020), signifying an elevated pH in the mire with intense microbial activity that favours decomposition of wood ...
    ... most abundant, exhibiting notable odd- over even predominance. The elevated contents of mid- chain, C23 and C25 n-alkanes, resulting in higher Paq index, are observed in Lower Miocene samples. The most abundant diterpenoid in aliphatic fraction of Lower Miocene lignites is 16α(H)-phyllocladane, whereas ...
    ... water-level and/or palaeo-wildfires. The main differences between Middle and Lower Miocene coals are expressed by higher dehydroicetexane content, Paq index, the tetracyclic/tricyclic diterpanes ratio and non-hopanoid triterpenoids content, as well as by lower content of total hopenes (particularly those ...

  • 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
    ... overdependence on several major energy sources. It can be measured by a diversity index of the possible energy resources for supply, such as the Shannon index (also known as a Shannon-Wiener index). Shannon’s index accounts for both abundance and evenness of the presented energy sources [1]. Renewable ...
    ... fuel consumption SS1 – ration of re- serves to production SS2 – ration of resources and production D – diversity index of the possible energy resources for supply – Shannon index RES1 – RES share in TPES RES2 – RES share in TFC TM1a – efficiency of electricity generation TM1b – electricity ...
    ... be undertaken. Diversification Diversity index provides more information than simply the number and amount of en- ergy sources used. It serves as valuable tool to quantify diversity in a community and describe its numerical structure [16]. The index is calculated as the proportion of individual ...

  • 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
    ... Sect. Geol., 35, 139-140. KARAMATA, S. (2006): The geological development of the Balkan Pe- ninsula related to the approach, collision and compression of Gond- ana and Eurasian units.–- In: ROBERTSON A.H.F. & MOUNTRA- KIS D. (eds.): Tectonic development of the Eastern Mediterranean Region ...
    ... (KORCHAGIN et al., 2012, BRAGINA et al., 2014). Samples BR 1/1 and BR 1/3 also contain the species 4/- ievium gallowayi (White), which is the index species of the synonymous Santonian zone of California (PESSAGNO, 1976). It should be noted that the joint occurrence of radi- olarian species ...

  • Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study

    Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)
    Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...
    Pharmaceutical Science
    ... redispersibility index was reached for the same ratio (3:2), although it was below 90%. This indicated that the mentioned ratio might be the best option for particle size maintenance. Table 3 Mean hydrodynamic diameter (z-ave), polydispersity index (PDI), redis- persibiliy index (RDI) and cake ...
    ... collapsed skin appearance: good good formation cake formation good · good Fig. 1. Mean hydrodynamic diameter (z-ave), polydispersity index (PDI) and redispersibiliy index (RD!) after lyophilization of nanocrystal dispersion with different sucrose/mannitol ratios (z-ave: *, ** and *** for P < 0.05, 0.01 ...
    ... given in Figure S1. After freeze-drying, the particle size remained Table 1 Mean hydrodynamic diameter (z-ave), polydispersity index (PDI), redis- persibiliy index (RDI) and cake appearance of nanocrystal dispersions before lyophilization-1, and following reconstitution right after lyophilization ...

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... Shannon–Wiener diversity index. Diversity of fuel source mix describes one dimension of security robustness against interruptions of any source (Liang-huey Lo, 2011). The higher the value of the Shannon–Wiener index is, the more diverse the system is. The Shannon–Wiener index is calculated by: where ...
    ... factor, specific heat consumption per degree day and heating area), the security of energy supply (import dependency, Shannon–Wiener diversification index, the share of renewables) and environmental impact (carbon dioxide emission coefficient). Values of the selected indicators are determined for the ...
    ... Fraction of the ith input energy carrier/fuel in the fuel mix ( ∑ pi = 1) Id,i Import dependency of the ith energy carrier/fuel H Shannon–Wiener index FRES Share of renewable energy sources E i,RES Energy content of input to the system of the ith renewable energy carrier Qext,RES Externally supplied ...

  • Classification of Terms on a Positive-Negative Feelings Polarity Scale Based on Emoticons

    Mihailo Škorić (2017)
    The goal of this paper is to draw attention to the possibility of using emoticon-riddled text on the web in language-neutral sentiment analysis. It introduces several innovations in the existing framework of research and tests their effectiveness. It also presents a software tool especially made for that purpose, explains how it builds a database with sentimental value of terms and offers the user manual. Finally, it presents a software tool that tests the new database and gives some examples ...
    data mining, information extraction, emotions, text on the web
    ... Creating index of tokens with values This step is performed by pressing the pripremi tokene za izvoz (prepere tokens for export) button in the bottom area of prduction tab (Figure 7). Execution of this command is possible only after all the preceding steps of preparation were completed. For index to serve ...
    ... successfully carried out the conversion of a set of tokens with the values to the final inverted index of terms with its values (Table 2), the user will get the message about the successfull completion, and the index will be stored in a temporary file until his final export. Infotheca Vol. 17, No. 1, 2017 ...
    ... development of entirely new, better and more complete tool. The main idea of this experiment is to prove that it is possible to: – build an inverted index of terms in a language-neutral way using a corpus of texts that contain known determiners. – automatically assign values to terms on positive-negative ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... the intersection Fig. 2. Precision-recall curve for the first query (zlato OR Au) AND (Bor OR Borski okrug): left, retrieval wihout index; right, retrieval with index. point k, and ∆(k) is the change in recall from items k − 1 to k. The results show that for 4 queries AP was higher in the old system ...
    ... morphological dic- tionaries and transducers, and named entities within the metadata were recognized using a rule-based system. Both were then used for index- ing documents and ranking was based on tf idf measure. Evaluation of ranked retrieval results based on data obtained by pre-indexing are com- pared ...
    ... collections, a formal representation surrogate of each document is usually formed. Based on these representations, during the prepara- tory phase an index of the collection of documents is formed, which is then used in the search phase. Automatic assigning of surrogates is usually done by ex- tracting ...

  • Definisanje parametara čvrstoće na smicanje kod izvođenja kosina u ispucalom stenskom masivu

    Zoran M. Berisavljević (2016-04-01)
    Definisanje parametara čvrstoće na smicanje ispucalih stenskih masa predstavlja jedanod najzahtevnijih zadataka mehanike stena. Geotehnička istraživanja su uglavnomograničena na rezultate laboratorijskih ispitivanja malih makroskopski homogenihuzoraka, sa kojih se vrši ekstrapolacija rezultata na terensku razmeru. Ispitivanja semogu vršiti in situ, ali su i ona ograničena veličinom korišćene aparature imikrolokacijom na kojoj se vrše ispitivanja. Pored toga, moguće je vršiti različitaispitivanja na fizičkim modelima, koja su veoma složena i skupa. Ekstrapolacijapodataka sa malog uzorka na terensku razmeru daje mnogo bolje rezultate ...
    naponsko stanje, ispucalost, heterogenost, čvrstoća na smicanje, geološki indeksčvrstoće, Hoek-Brownov materijal, kompozitni uzorci, dezintegracija, povratna analiza

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation