Претрага
686 items
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Mineral Resources of Serbia: Environmental, Societal and Economic Challenges
... 2008 to 2017, while since 2017 she has been teaching Fundamentals of Instrumental Analysis and Environmental Protection. The research interest of Maja Nujkić is in the area of chemistry, chemical technology, chemical engineering, and environmental engineering and protection, with special emphasis ...
... Professor Dimitrijević has taught the following courses at the Technical faculty in Bor: Chemical Technology, Chemical Kinetics, Solid Waste Treatment, Electrochemical Technology, Corrosion and Protection, Analysis of Technological Processes and Environmental Protection. Professor Dimitrijević worked ...
... Biodiesel Synthesis Using Supported ZnO as Catalyst.” Chemical Engineering and Technology 37 (11): 1879—84. doi:10.1002/ceat.201300714. Martinovic, F. L., F. E. Kiss, R. D. Micic, M. Simikić, and M. D. Tomić. 2018. “Comparative Techno-Economic Analysis of Single-Step and Two-Step Biodiesel Production ...Vladimir Simić, Rade Jelenković, Dragana Životić. "Mineral Resources of Serbia: Environmental, Societal and Economic Challenges" in Serbia: Current Issues and Challenges in the Areas of Natural Resources, Agriculture and Environment,, Nova Science Publishers, Inc. (2019)
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Kristalne strukture Cs2HoSi4O10F i Cs2TmSi4O10F
... bg.ac.rs During investigation focused on the synthesis of new potassium rare-earth elements silicates two compounds with a previously unknown chemical composition - Cs2HoSi4O10F and Cs2TmSi4O10F were obtained in form of single crystals. The compounds were synthesized by the method of crystal growth ...
... (REE = Ho, Tm), SiO2 and CsF as starting materials. The crystal structures of both compounds were determined by single-crystal X-ray diffraction analysis. They represent mutually isostructural compounds which crystallize in the orthorhombic space group Pnma with following unit cell parameters: a = ...Predrag Dabić, Sabina Kovač, Aleksandar Kremenović. "Kristalne strukture Cs2HoSi4O10F i Cs2TmSi4O10F" in XXVII konferencija Srpskog kristalografskog društva, Kragujevac, 16-17. septembar 2021., Beograd : Srpsko kristalografsko društvo (2021)
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The Rift Sequence Stratigraphy of the Itebej Field (Pannonian Basin, Serbia)
... petroleum system elements in the south of the Neogene Srpska Crnja Depression (Makó Depression in Hungary, Tomnatec Depression in Romania). The analysis included interpretation of three 3D seismic sections and well data of 33 deep wells. Pre-rift stage is represented by deep-water Late Cretaceous ...Saša Ivanišević, Jelena Radišić, Ivana Isić, Dejan Radivojević. "The Rift Sequence Stratigraphy of the Itebej Field (Pannonian Basin, Serbia)" in AAPG Vienna, Paratethys petroleum systems between Central Europe and the Caspian Region, Vienna, 26-27 mart, 2019, AAPG (2019)
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Postojeće stanje i budući trendovi u preventivnoj zaštiti podzemnih voda Srbije
Vladimir Živanović (2022)Podzemne vode predstavljaju osnovni, a u mnogim zemljama i jedini resurs za javno vodosnabdevanje stanovništva tako da zaštita podzemnih voda predstavlja bitan preduslov za njihovo dugotrajno i održivo korišćenje. Kako u svetu, tako i u Srbiji, zaštita podzemnih voda se najvećim delom svodi na primenu preventivnih mera zaštite. Kod planiranja zaštite većih prostora sve više se koriste metode za ocenu ranjivosti podzemnih voda. Njihova primena je posebno naglašena u karstnim područjima zato što se tu izdvajaju delovi terena sa ...Zaštita podzemnih voda, karte ranjivosti podzemnih voda, karta hazarda, karte rizika od kontaminacije, monitoring podzemnih voda, SrbijaVladimir Živanović. "Postojeće stanje i budući trendovi u preventivnoj zaštiti podzemnih voda Srbije" in Zbornik radova XVI srpskog Simpozijum o hidrogeologiji sa međunarodnim učešćem, Univerzitet u Beograd, Rudarsko-geološki fakultet (2022)
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Dvodimenzionalna geometrijska morfometrija prvih gornjih molara hominina sa teritorije Srbije - taksonomska i metodološka analiza
Predrag N. Radović (2022)Primarni cilj ove studije tiče se taksonomske identifikacije fosilnih prvih gornjih molara (M1) hominina pronađenih u Srbiji, primenom metoda dvodimenzionalne (2D) geometrijske morfometrije. U prvoj (metodološkoj) fazi istraživanja ispitana je efikasnost 16 različitih pristupa (geometrijskih modela) u klasifikaciji M1 neandertalaca i anatomski modernog čoveka. Modeli su testirani na dva seta okluzalnih projekcija krunica (n = 34 i n = 64) dobijenih orijentisanjem digitalnih 3D modela u virtuelnom okruženju ili fotografisanjem fizičkih primeraka zuba. Prilikom testiranja primenjena je klasifikacija zasnovana ...2D geometrijska morfometrija, prvi gornji molar (M1), taksonomska identifikacija, neandertalci, anatomski moderni ljudi, Pešturina, Velika Balanica, SrbijaPredrag N. Radović. Dvodimenzionalna geometrijska morfometrija prvih gornjih molara hominina sa teritorije Srbije - taksonomska i metodološka analiza, Beograd : [P. Radović], 2022
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The influence of rainfall factors on soil resistance to erosion
Nikola Živanović, Vukašin Rončević, Carla Ferreira, Milica Kašanin-Grubin, Stevan Ćorluka, Veljko Rupar, Vladimir Čebašek (2024)Nikola Živanović, Vukašin Rončević, Carla Ferreira, Milica Kašanin-Grubin, Stevan Ćorluka, Veljko Rupar, Vladimir Čebašek. "The influence of rainfall factors on soil resistance to erosion" in EGU General Assembly 2024, Vienna, Austria, Apr 14–19, 2024, Copernicus GmbH (2024). https://doi.org/10.5194/egusphere-egu24-1137
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P-T analiza RMU Bitola – krupne klase
Nemanja Dobrosavljević (2024)Cilj ovog diplomskog rada je bio ispitivanje mogućnosti i tehnologije čišćenjauglja, kao i predstaviti rezultate pliva – tone analize koja ima za cilj ocenu mogućnosti čišćenja uglja - krupnih klasa posmatranog uzorka. Da bi se ispitivanje i analiza mogućnosti čišćenja rovnog uglja u REK Bitola uspešno priveli kraju, moralo se uraditi uzorkovanje reprezentativnog uzorka iz koga se potom izdvaja prvi deo koji služi za određivanje sadržaja vlage. Pored tog dela iz uzorka se izdvaja i drugi njegov deo koji će ...ugalj, lignit, Bitola, PT analiza, pliva-tone analiza, čišćenje uglja, suvi ugalj, vlažan ugalj, pepeo, donja toplotna moć, čist ugalj, jalovina, bilans... technology, as well as to present the results of the float-ton analysis, which aims to evaluate the possibility of coal cleaning - large classes of the observed sample. In order to successfully complete the examination and analysis of the possibility of cleaning the pit coal in REK Bitola, sampling ...
... is separated, which will be used for the analysis of pit coal, and then a third part of the sample, which will be used for determining the granulometric composition. At the end, a part ofthe sample is separated from the sampled pit coal for PT analysis. After sampling the pit coal and dividing ...
... dividing it into segments for further analysis, an analysis of its granulometric composition was performed, using standard and non- standard sicves with the following opening diameters: 60; 31.5; 16; 5; 0.5; 0.25; 0.125 and 0.00 mm. After measuring the size classes, the results are shown in tabular and ...Nemanja Dobrosavljević. P-T analiza RMU Bitola – krupne klase, 2024
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A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian
Uvredljivi govor na društvenim medijima, uključujući psovke, pogrdni govor i govor mržnje, dostigao je nivo pandemije. Sistem koji bi bio u stanju da detektuje takve tekstove mogao bi da pomogne da internet i društveni mediji postanu bolji virtuelni prostor sa više poštovanja. Istraživanja i komercijalna primena u ovoj oblasti do sada su bili fokusirani uglavnom na engleski jezik. Ovaj rad predstavlja rad na izgradnji AbCoSER-a, prvog korpusa uvredljivog govora na srpskom jeziku. Korpus se sastoji od 6.436 ručno označenih ...... language, etc. In this paper, we explain the process of data acquisition, annotation, and corpus construction. We also discuss the results of an initial analysis of the annotation quality. Finally, we present an abusive speech lexicon structure and its enrichment with abusive triggers extracted from the AbCoSER ...
... in Section 2.2 while the extraction of abusive triggers is explained in Section 2.3. The Section 3 presents results of our research: Twitter data analysis (Subsection 3.1), the outcome of the annotation (Subsection 3.2) and the structure of the lexicon of abusive words (Subsection 3.3). We summarize ...
... Tree clouds of abusive language corpus: the non-abusive subset (left) and abusive subset (right). 3 A Corpus and Lexicon for Abusive Speech 3.1 Analysis of the twitter corpus The distribution of our corpus tweets length after removal of mentions is shown in Figure 4: the median value is 54 characters ...Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih. "A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian" in 3rd Conference on Language, Data and Knowledge (LDK 2021), MDPI AG (2021). https://doi.org/10.4230/OASIcs.LDK.2021.13
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State and perspective of individual household heating in Serbia: A survey-based study
This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...Boban Pavlović, Dejan Ivezić, Marija Živković. "State and perspective of individual household heating in Serbia: A survey-based study" in Energy and Buildings, Elsevier BV (2021). https://doi.org/10.1016/j.enbuild.2021.111128
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Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija
Srđan D. Kostić (2013-11-04)U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja... state variables. The stability analysis for these models is conducted numerically and analytically. The numerical analysis was performed for Carlson-Langer and Becker model, by applying the Runge-Kutta fourth-order method. In the case of Madariaga model, the analysis is performed analytically (standard ...
... excavation of horizontal underground chambers. The conducted analysis was twofold – in the first part of the research, time series of strong ground motion during the seismic event are analyzed, while in the second part, the stability analysis of phenomenological Burridge-Knopoff spring-block model ...
... model is conducted. For this purpose, different methods are engaged. The time series analysis was performed using the surrogate data testing and nonlinear time series analysis (delay embedding theorem). These analyzes were performed for the strong ground motion recordings at three different mines in ...Srđan D. Kostić. "Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-11-04)
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Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija
Srđan D. Kostić (2013-11-04)U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja... state variables. The stability analysis for these models is conducted numerically and analytically. The numerical analysis was performed for Carlson-Langer and Becker model, by applying the Runge-Kutta fourth-order method. In the case of Madariaga model, the analysis is performed analytically (standard ...
... excavation of horizontal underground chambers. The conducted analysis was twofold – in the first part of the research, time series of strong ground motion during the seismic event are analyzed, while in the second part, the stability analysis of phenomenological Burridge-Knopoff spring-block model ...
... model is conducted. For this purpose, different methods are engaged. The time series analysis was performed using the surrogate data testing and nonlinear time series analysis (delay embedding theorem). These analyzes were performed for the strong ground motion recordings at three different mines in ...Srđan D. Kostić. "Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-11-04)
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An Approach to Development of Bilingual Lexical Resources
... sh Dictionary of Library and Information Science technology (further referred to as Dictionary of Librarianship) [Kovačević et al., 2004]. An analysis of results obtained by Bibliša revealed that in some cases the available bilingual resources, namely the wordnets and the Dictionary of Lib ...
... the term user friendly (without the dash) and the corresponding Serbian terms are jednostavan za upotrebu and lak za učenje i korišćenje. The analysis of concordances obtained for the query user friendly showed that its Serbian translational counterparts in the Dictionary of Librarianship are ...
... correct one being prelistač. Due to this incorrect translation there were no Serbian matches for browser in the concordances. Based upon their analysis, the synset pair {browser, web browser}-{prelistač, veb prelistač, pregledač veba} was entered into Biblimir. Query expansion for the keyword ...Stanković Ranka, Obradović Ivan, Trtovac Aleksandra. "An Approach to Development of Bilingual Lexical Resources" in Proceedings of the Fifth Balkan Conference in Informatics BCI 2012, Workshop on Computational Linguistics and Natural Language Processing of Balkan Languages – CLoBL 2012, September 2012, Novi Sad : BCI (2012)
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Improvement of geodatabase queries within GeolISS
Ranka Stanković (2008)... overlap'. 2. GeolISS The Geological information system of Serbia (GeolISS) represents a repository for digital archiving, query, retrieving, analysis and visualization of geological data. The development and implementation of the GeolISS is managed by a team from the Faculty of Mining and Geology ...
... spatial data has an appropriate form for data management, with the possibility of adding various related data, such as geochemical and geophysical analysis, different types of measurements, stratigraphic age, lithology, etc. Figure 1. Geological unit selected in GeolISS environment with ...
... semantic expanded query 6. Conclusion GeolISS has proved as a substantial and reliable foundation for digital archiving, query, retrieving, analysis and visualization of geological data. GeolISS has been implemented in ESRI ArcGIS technology, designed to function as a personal geodatabase and ...Ranka Stanković. "Improvement of geodatabase queries within GeolISS" in Review of the National Center for Digitization, Beograd : Faculty of Mathematics, Belgrade (2008)
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Hidrogeohemijska valorizacija esencijalnih mikroelemenata mineralnih voda Srbije
Jana S. Stojković (2013-09-25)Mineralne vode još od davnina privlače pažnju ljudi i to kako u pogledu istraživanja iproučavanja, tako i u pogledu njihovog iskorišćavanja. Naročito je važno poznavanjesadržaja mikroelemenata u njima, jer su to komponente njihovog hemijskog sastavakoje ih odvajaju od tzv. „običnih“ malomineralizovanih voda.U ovom radu proučavani su odabrani esencijalni mikroelementi (fluor, bor, litijum,kalijum, stroncijum i silicijum), u mineralnim vodama Srbije, pri čemu je analiziranopreko 130 uzoraka mineralnih voda iz različitih geoloških sredina, to jest hidrogeološkihrejona. Cilj ovog istraživanja bio je ...esencijalni mikroelementi, faktori migracije, zakonomernosti rasprostranjenja, hidrogeohemijski procesi, multivarijantna statistička analiza, mineralne vode Srbije... field measurements and laboratory analysis, as well as for systematization and data analysis. Multivariate statistical analysis (factor analysis, Q-mode cluster analysis and R-mode cluster analysis) has been applied on the research results of physical and chemical characteristics of mineral waters ...
... package USGS PHREEQC 2.18). The use of factor analysis allowed grouping of hydrochemical variables correlating to each other, which can be connected to certain hydrogeochemical processes. Applying factor analysis to a dataset that consists of 14 chemical parameters measured on 110 mineral water samples ...
... influenced by lithological and mineralogical structure of aquifer. Using the cluster analysis the sample grouping of mineral waters has been done, on the basis of similarity of their physical and chemical characteristics. In this way four groups (clusters) and eight subgroups have been distinguished ...Jana S. Stojković. "Hidrogeohemijska valorizacija esencijalnih mikroelemenata mineralnih voda Srbije" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-09-25)
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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.Sanja Bajić. "Multiple-Criteria Decision-Making in Mine Development Planning" in Proceedings of the 5th International Underground Excavations Symposium, 5-6-7 June 2023, Istanbul, Topkapi : Dinç Ofset Mat. Rek. San. ve Tic. Ltd. Şti. (2023)
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Hazardous substances in karst aquifer waters - one of the results of the operational monitoring of groundwater in Serbia
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 ...Zoran Stevanović, Veljko Marinović, Branislav Petrović. "Hazardous substances in karst aquifer waters - one of the results of the operational monitoring of groundwater in Serbia" in Geoloski anali Balkanskoga poluostrva (Annales geologiques de la Peninsule balkanique), University of Belgrade, Faculty of Mining and Geology (2020). https://doi.org/10.2298/GABP201107010S
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Rift sequence stratigraphy and its contribution to source rock understanding – Serbian part of Pannonian Basin
Filip Anđelković, Dejan Radivojević (2018)... part of Pannonian Basin showed that rifting took place along asymmetric simple shear exten- sional mechanism (Matenco and Radivojević, 2012). The analysis of syn-kinematic reflectors demonstrates that normal faulting migrates in time and space and took place on a wide Miocene time interval (roughly ...Filip Anđelković, Dejan Radivojević. "Rift sequence stratigraphy and its contribution to source rock understanding – Serbian part of Pannonian Basin" in CBGA, Salzburg, Austria, Septembar 10-13, 2018, Bulgarian Academy of Science (2018)
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Preparation, synthesis and characterization of nanometric Ca0.9Er0.1MnO3
Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)... 800-1000 *C for a period of 15 min. The effects of calcination were characterized through different experimental techniques (differential thermal analysis (DTA), X-ray diffraction (KRD), Fourier transform infrared spectroscopy (FTIR), Field emission scanning eclectron microscopy (FESEM), and inductively ...Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić. "Preparation, synthesis and characterization of nanometric Ca0.9Er0.1MnO3" in Programme and Book of abstracts 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia October 11-14, 2023 , Novi Sad : Faculty of Technology, University of Novi Sad (2023)
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Indexing of textual databases based on lexical resources: A case study for Serbian
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 ...... alignment with whole words precisely in order to recognize at least some inflectional forms. This problem is generated by query keywords such as the chemical symbol for gold “Au” or the name of the company “NIS”. In such cases, the accuracy of the new system is significantly greater (see queries 8 and ...
... been organized on the principle of traditional libraries and archives, where obtaining specific information was difficult or time consum- ing. Usage analysis of the geological investigations results, stored in numerous archives and document libraries, showed that they were inefficiently used be- cause of ...
... lemmatizer based on suffix stripping [5], the same basic idea being used in the stemmer presented in a later paper [11]. The only stemmer available for analysis is the last one since its code is given in the paper. However, although the author claims accuracy of 92% it was evaluated on a very small text (522 ...Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović. "Indexing of textual databases based on lexical resources: A case study for Serbian" in Semantic Keyword-based Search on Structured Data Sources : First COST Action IC1302 International KEYSTONE Conference, IKC 2015, Coimbra, Portugal, September 8-9, 2015. Revised Selected Papers, Springer (2015). https://doi.org/10.1007/978-3-319-27932-9_15
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Frequency and Length of Syllables in Serbian
Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.... definition, but it facilitates easy automatic text processing (see e.g. a discussion on this topic in Antić et al., 2006, pp. 118-121). The text under analysis (see Section 3) is pre-processed, so that it does not contain any zero-syllable words. ...
... frequent syllables are shorter.18 Indeed, the value of the Spearman correlation coefficient between syllable frequency and length in the text under analysis is −0.397. It is quite clearly statistically significant, with p-value < 0.001. The negative correlation between frequency and length of syllables ...
... suggested by Strauss et al. (2008), according to which syllables, as far as models are concerned, behave like words. Syllables in the Serbian text under analysis „mimic“ the behaviour of words with respect to their frequencies, length, and the relation between these two properties. The models used belong to ...Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová. "Frequency and Length of Syllables in Serbian" in Glottometrics (2019)