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Упит dcterms_subject_txt:chemical analysis

753 items

  • Understanding partitioning of deformation in highly arcuate orogenic systems: Inferences from the evolution of the Serbian Carpathians

    Nemanja Krstekanić, Liviu Matenco, Marinko Toljić, Oleg Mandić, Uroš Stojadinović, Ernst Willingshofer (2020)
    orogeneza, oroklini, višesmerna ekstenzija, transkurentna kretanja, Srpski Karpati
    ... n in back-arc basins: new genetic constraints from the analysis of the Pannonian Basin. Tectonics 35, 1526–1559. Balázs, A., Magyar, I., Matenco, L., Sztanó, O., Tőkés, L., Horváth, F., 2018. Morphology of a large paleo-lake: analysis of compaction in the Miocene–Quaternary Pannonian Basin ...
    ... ) during the early Tertiary: inferences from kinematic and paleostress analysis at the Getic/Danubian nappes contact. Tectonophysics 314, 401–422. Matenco, L., Bertotti, G., Cloetingh, S., Dinu, C., 2003. Subsidence analysis and tectonic evolution of the external Carpathian–Moesian Platform region ...
    ... 103361 8 have started only during Pliocene times (Anđelković et al., 1977; Vujisić et al., 1980). 3. Field structural observations and kinematic analysis We have performed our fieldwork in the key area of interference between strike-slip, orogen-parallel and orogen-perpendicular exten- sion, which ...

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika

  • Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje

    Marko Lazić, Filip Miletić, Milena Lekić, Veljko Rupar, Željko Petrović, Lazar Žujović (2021)
    U radu su analizirani eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje. Period analize je prvih šest meseci tekuće godine. Analiza je vršena sa aspekta ostvarene proizvodnje, kvaliteta uglja, efektivnog vremena rada, kapacitetnog i vremenskog iskoršćenja i zastoja sistema. Za poređenje podataka različitih parametara koji po svojoj prirodi nisu međusobno uporedivi, u radu su korišćene metode višekriterijumskog odlučivanja.
    proizvodnja uglja, zastoji, metode višekriterijumskog odlučivanja
    ... paper analyzed the exploitation effects of coal systems at the open–pit mine Tamnava–West field for the first six months of the current year. The analysis was performed in the aspect of reached production, coal quality, effective working time, capacity and time utilization and system stoppage using ...
    ... of modified VIKOR method. Expert Systems with Applications, 38(3), 2550-2556;Systems with Applications, 121, 393-417; [9] Tsaur R–C.,,Decision risk analysis for an interval TOPSIS method” Applied Mathematics and Computation 218(8), pp. 4295–4304, 2011. doi:10.1016/j.amc.2011.10.001; [10] Krohling, R.A ...

  • Palaeoflora of Kamenica (Pranjani Basin, western Serbia)

    Zorica Lazarević, Ljubica Milovanović, Jelena Milivojević, Ivana Vasiljević (2019)
    Palaeofloras of the Paleogene in Serbia are relatively rare, especially in comparison with floras from Neogene sediments. Most Paleogene phytoas sociations from the territory of Serbia existed in a dry and warm climate. The youngest Paleogene phytoassociation originates from the Pranjani Basin (Western Serbia), locality Kamenica. The age of this palaeoflora is determined as Late Oligocene. This fossil plant assemblage is different from other Paleo gene phytoassociations.The palaeoflora from Kamenica is characterized with leaf imprints larger than in other ...
    макрофлора, млађи олигоцен, Прањански басен, Каменица
    ... leaves – a physiognomic analysis of european vegetation. New Phytologist, 166: 465–484. Palaeoflora of Kamenica (Pranjani Basin, western Serbia) Geol. an. Balk. poluos., 2019, 80 (2), 53–63 57 WILF, P. 1997. When are leaves good thermometers? a new case for Leaf Margin analysis. Paleobiology, 23 (3): ...
    ... (3): 373–390. WOLF, j. 1971. Tertiary climatic Fluctations and Methods of analysis of Tertiary floras. Palaeogeography, Palaeo- climatology, Palaeoecology, 9: 27–57. Резиме Палеофлора Каменице (Прањански басен, западна Србија) Палеогене флоре у Србији су релативно ре тке, посебно у поређењу са ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... as well as their combinations, which can be used in the analysis of the choice of arrangement of post-exploitation landscapes (Table 2). The subject of our research is the surface mine Drmno viewed as a training: ground for experimental analysis of the choice of the type of reclamation and the appropriate ...
    ... Combination of ; N ; ; hierarchy NINR comprehensive way of thinking: | Cannot provide new options for qualitative and : :. ; process uantitative analysis and systematically treat research | decision-making. (AHP) d JSIS. objects as a system. : Can cause the phenomenon known Chosen alternative NIOAR ...

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... 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 ...

  • 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 ...

  • 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 ...

  • 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 ...

  • 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 ...

  • A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian

    Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih (2021)
    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 ...
    uvredljivi jezik, govor mržnje, srpski, tviter, leksikon, korpus
    ... 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 ...

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    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 ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • Потреба за израдом биланса и оценом расположивих резерви подземних вода Републике Србије

    Зоран Стевановић, Вељко Мариновић, Бранислав Петровић (2021)
    Природне карактеристике Србије, просторна дистрибуција ресурса водe и њихових корисника, као и међусобна интеракција коришћења, заштите вода, као и заштите од вода, условиле су да се подземне воде на читавој територији морају посматрати интегрално, јединствено, комплексно и рационално. Међутим, тренутно је у Републици Србији могуће дефинисати само одлике појединих издани и/или изворишта услед непостојања довољних података за свеобухватну анализу стања ресурса. За оцену притиска на квантитет ресурса подземних вода, што је обавеза према Оквирној директиви о водама ЕУ (ОДВ) ...
    подземни водни ресурси, биланс, расположиве резерве, одрживо управљање, Република Србија

  • Razvoj modela upravljanja cirkulacijom u postupku bušenja korišćenjem neuro fazi sistema zaključivanja

    Seyed Ali S. Razeghi (2022)
    Gubitak isplake predstavlja nekontrolisano isticanje bušaćeg fluida kroz formacije kao što su kaverne, pukotine, ili drugi slojevi. Tradicionalne metode procene gubitka isplake se zasnivaju na primeni seizmičkih podataka ili pronalasku „mesta“ gubitka isplake na osnovu raspoloživih podataka iz susednih bušotina. Međutim, ove metode procene nisu pouzdane.‘ U disertaciji je izvršena analiza i procena uticaja parametara bušenja, geoloških faktora, karakteristika formacije i fluida na gubitak isplake kao i na formiranje fraktura u formacijama. Uspostavljeni su modeli koji podrazumevaju proces obrade ...
    naftna bušotina, gubitak isplake, fuzzy logika, ANFIS model

  • The Content of Toxic Metals in Agricultural Produce near a Coal Mine: Case Study KCB in Lazarevac, Serbia

    Ana Koprivica, Čedomir Beljić, Boris Vakanjac, Vesna Ristić Vakanjac, Marina Čokorilo Ilić (2018)
    Праћење и анализа концентрација токсичних метала (олово и кадмијум) у земљишту и усевима указују на то да пољопривредно земљиште у Србији углавном није загађено, а квалитет земљишта је природно добар. Због тога су таква земљишта погодна за органску пољопривреду. Сви уочени случајеви контаминације токсичним металима су само локалне природе, а резултат су ђубрива и пестицида, комуналног отпада, издувних гасова, оближњих производних објеката, топионица, рудника, јаловишта итд. Локације овог типа морају бити редовно прати и процењује статус земљишта и усева. ...
    токсични метали, олово, кадмијум, земљиште, усеви, одрживи развој

  • 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.

  • Sistem poslovne inteligencije za upravljanje zaštitom na radu u rudarskoj industriji

    Ljiljana R. Kolonja (2016-09-23)
    Postojeća organizacija zaštite na radu na površinskim kopovima uglja često nije umogućnosti da blagovremeno i tačno ukaže na nedostatke, koji mogu u bližoj ilidaljoj budućnosti da budu uzrok narušavanja bezbednosti radnika, ali i uzrokoštećenja materijalnih dobara rudnika. Nemogućnost donošenja pravovremenihodluka je moguće izbeći uvođenjem softverski podržanih sistema za praćenje ianalizu bezbednosti i zaštite na radu.Osnovni cilj ove doktorske disertacije je definisanje metodologije i razvoj modelasistema upravljanja zaštitom na radu, koji će omogućiti savremen, adekvatan isveobuhvatan način praćenja i analize ...
    rudarstvo, bezbednost i zdravlje na radu, poslovna inteligencija,tehnička zaštita, ontologije
    ... measures. Records and the analysis of indicators of the state of occupational safety, such as accidents, injuries at work and occupational diseases should enable, with the application of modern information technologies, a complex and comprehensive analysis of collected data, the assessment ...
    ... Applying UML and patterns: an introduction to object‐oriented analysis and design and iterative development, Pearson Education India. LEI, T. & DING, R.‐J. 2008. Efficiency assessment of coal mine safety input by data envelopment analysis. Journal of China University of Mining and Technology, 18, 88‐92 ...
    ... and safety. Mining engineering handbook. SME. RANDOLPH, R. & BOLDT, C. 1997. Safety analysis of surface haulage accidents‐part 1. Holmes Safety Association Bulletin May‐June 1, 7. RANDOLPH, R. F. Injury analysis of Pennsylvania small surface coal mines. Proceedings of the 3rd Health and ...

  • An Approach to Development of Bilingual Lexical Resources

    Stanković Ranka, Obradović Ivan, Trtovac Aleksandra (2012)
    ... 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 ...

  • 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 ...

  • 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 ...
    ... 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 ...