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Упит dcterms_subject_txt:Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

2352 items

  • Simulation of Hydrogeological Environmental Discharge in Case of Interruption Constant Observations

    Marina Čokorilo Ilić, Dragoljub Bajić, Miroslav Popović (2024)
    Monitoring Network, data, hydrogeological environment, tunnel, simulation

  • 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.
    frekvencije slogova, dužina slogova, srpski jezik
    ... approach according to which only those syllable onsets exist that are observable word-initially, and those syllable codas that occur word-finally (cf. e.g. Kelih, 2012), is perhaps the best known theoretical framework. A more detailed description can be found in Pulgram (1970). However, this approach ...
    ... (2008). Frequency and Length of Syllables in Serbian 117 3. Language material Serbian is a South Slavic language. It has the official status in Serbia (exclusively) and in Bosnia and Herzegovina (as one of three languages, together with Bosnian and Croatian), and the status of a minority ...
    ... distinguishing between marginal (rarely occurring and considered to be exceptions) and non-marginal (found with a high frequency) consonant clusters at beginnings and ends of words; only those which are not marginal are allowed to form syllable onsets and codas. If one follows his modification, a large ...

  • A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... on of the dynamic and physical properties of a hydrogeologic system (American Society for Testing and Materials, 2014). According to Polomčić (2001), a hydrologic system is determined by: input elements, characteristics of the medium, processes that take place in the medium, and output elements, ...
    ... Ratković J., Polomčić D., Bajić D., Hajdin B. THE AMERICAN SOCIETY FOR TESTING AND MATERIALS (2016) Available from: http://www.astm.org/DATABASE.CART/WITHDRAWN/D5447.htm [Acessed 23/11/16]. ŠUBARANOVIĆ, T., PAVLOVIĆ, V. and POLOMČIĆ, D. (2013) Influence on environment of sealing screen at lignite opencast ...
    ... Belgrade (Fig. 1) and encompasses the area around the middle and lower courses of the Kolubara River and its tributaries: the Tamnava (left) and the Peštan (right). Tamnava – West Field falls within the municipalities of Lajkovac and Ub, near the villages of Kalenić, Mali Borak, Radljevo and Skobalj. To ...

  • Improvement of education through the cooperation between CEEPUS EURO Geo-Sci network and scientific projects: examples from UB-FMG

    Kristina Šarić, Dejan Prelević, Miloš Marjanović, Uroš Stojadinović, Vladimir Simić (2024)
    CIII-RS-0038, Recon Tethys, DEMONITOR, TMCmod, REASONING

  • Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex

    Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males (2024)
    Timok Magmatic Complex, Neotethys subduction, basin geodynamics, analogue modelling

  • Extreme Rainfall Event and Its Aftermath Analysis—IPL 210 Project Progress Report

    Biljana Abolmasov, Mileva Samardžić Petrović, Ranka Stanković, Miloš Marjanović, Jelka Krušić, Uroš Đurić (2021)
    Landslides, Extreme precipitation, Data analysis, IPL project report

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... factors (emissions per unit of the physical weight of materials) are obtained from the Ecoinvent 3.0 database (expressed by GWP100 per kg) [24] and the EPA stationary combustion emission factors inventory [23] (expressed by GWP100 per kg). Table 3. LCA of firewood-based HS - SMEDEREVAC 7 NEW LINE ...
    ... lifecycle of each HS (materials, manufacturing, transportation, use, and final disposal) [10]. Life cycle assessment (LCA) systematically analyzes pollution and resource connected to delivering a specific product or service. As such, the LCA identifies environmental hot spots and enables a comparison ...
    ... their high calorific value, low ash content, and slagging rate [20]. The basic information and material composition of HSs are given in Table 2 [21], [22]. The materials mentioned in Table 2 form the bulk of the furnace’s weight (90%). Other materials that constitute a smaller fraction of the appliance ...

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS

  • P-T analiza uglja RB Kolubara

    Rada Vitomir (2024)
    Rudarski basen Kolubara predstavlja jedno od najvažnijih ležišta lignita u Republici Srbiji i ključni je faktor u snabdevanju zemlje energijom. Kvalitet uglja iz ovog basena direktno utiče na efikasnost termoelektrana i zadovoljenje energetskih potreba. U ovom radu, opisan je značaj tehničke i elementarne analiza uglja kako bi se utvrdili fizičko-hemijski parametri uglja iz Rudarskog basena Kolubara. U drugom delu rada dat je opis P-T analize uglja i njen značaj za ocenu mogućnosti čišćenja uglja. Takođe, dati su i rezultati ...
    Rudarski basen Kolubara, pliva tona analiza, lignit, kvalitet uglja, energetska efikasnost
    ... C., Frandsen, F. J., & Spliethoff, H. (2018). Ash formation and deposition in coal and biomass fired combustion systems: Progress and 69 challenges in the field of ash particle sticking and rebound behavior. Progress in energy and combustion science, 68, 65-168. 11. Kostović M., Industrijski ...
    ... Arsenic hazards in coal fly ash and its fate in Indian scenario. Resources, Conservation and Recycling, 55(9-10), 819-835. 17.Rasulić, N., Delić, D., Kuzmanović, S., Jošić, D., Kuzmanović, Đ., Anđelović, S., & Stajković-Srbinović, O. (2013). Agrochemical and microbiological properties of the ...
    ... decayed plant — low sulfur as afuelbecause · fuelbecauseofits matterin content;limited Ofits high heat high heat content swamps and suppliesinmost _ cOntentand large and |°W.5U|fUl' bogs;lowheat · „areas supplies; normally conte_nt, content has a supplies are high sulfur limitedin most content ...

  • A bilingual digital library for academic and entrepreneurial knowledge management

    Ranka Stanković, Cvetana Krstev, Biljana Lazić, Dalibor Vorkapić (2015)
    A generic knowledge management process of organization, storage and retrieval of knowledge can suitably be fitted in a digital library. In the digital and knowledge age digital libraries can be used in knowledge management to handle intellectual assets and support knowledge creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to monolingual content. In Serbia 18 of 308 scientific journals regularly published are bi-lingual, with papers simultaneously being in English ...
    Knowledge management, Digital library, Multilingualism, Language Resources, Terminology
    ... knowledge era: Knowledge management and Semantic Web technologies”, Library Management, 26(4/5), pp. 170-175. Roknuzzaman, Md. ,Hideaki Kanai and Katsuhiro Umemoto, (2009) "Integration of knowledge management process into digital library system: A theoretical perspective", Library Review, Vol ...
    ... of library and information sciences, digital humanities, architecture and mining and also project reports on academic and entrepreneurial knowledge and e-learning. It contains articles from three journals INFOtheca - Journal for Digital Humanities, Underground Mining Engineering, and Architecture ...
    ... 3 Design and methodology 3.1. Knowledge management and digital library Roknuzzaman reported overlaps between digital libraries and knowledge management, stating that a generic knowledge management process of acquisition, organization, storage and retrieval, and dissemination of knowledge ...

  • Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2019)
    In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...
    NER, Named Entity Recognition Systems, Serbian, Personal Names
    ... Association for Computational Linguistics, pages 141–150. Nathalie Friburger and Denis Maurel. 2004. Finite- state Transducer Cascades to Extract Named Entities in Texts. Theoretical Computer Science 313(1):93– 104. Ralph Grishman and Beth Sundheim. 1996. Message Understanding Conference-6: A Brief History ...
    ... are three categories of NER systems: 1) The rule-based (RB) (Krupka and Hausman, 1998; Friburger and Maurel, 2004); 2) the Ma- chine Learning (ML) based (Finkel and Manning, 2009; Singh et al., 2010); and 3) hybrid meth- ods (Jansche and Abney, 2002). The ML-based methods can often be “black boxes”, in ...
    ... appli- cation that enables NER across many languages and domains),1 OpenNLP (rule-based and statisti- cal NER),2 spaCy (Honnibal and Montani, 2017) (module written in Python, used for advanced NLP)3 and many others. For Serbian, thus far a rule-based and lexicon-based NER system was developed – SRPNER (Krstev ...

  • Методологија интегралне анализе сценарија енергетског развоја

    Александар Маџаревић (2019)
    енергетска безбедност, сценарио развоја, фази логика, сигурност снабдевања, доступност, расположивост, природни гас
    ... Handbook of Chemistry and Physics, Boca Raton, 2006 Holleman, A. F., Wiberg, E., Inorganic Chemistry, San Diego: Academic Press. ISBN 0-12-352651-5, 2001 EPA, United States Environmental Protection Agency, Sulphur oxide ,2018 Soud, H., Fukasawa, K., Developments in NOx abatement and control, IEACR/89 ...
    ... national and global level, accompany with long-term changes and projections of possible developments in the energy sector is very important. The demand for final energy is from the industrial revolution increased by as much as 30 times, as a result of rapid technological progress and intensive ...
    ... for the sustainable development of the state, the region, local self-governments, and economic and other organizations. Strategic energy planning covers consideration of various scenarios of energy development and their critical analysis in the context of general socio-economic development. The ...

  • Optimizacija parametara reza rotornog bagera pri otkopavanju materijala sa povećanom čvrstoćom

    Saša D. Bošković (2016-09-09)
    Otkopavanje materijala rotornim bagerom je veoma sloţen fiziĉko-mehaniĉki proces. Pokazatelji efektivnosti tog procesa zavise od velikog broja raznovrsnih ĉinilaca od kojih se posebno mogu istaći: fiziĉko-mehaniĉke karakteristike materijala koji se otkopava, reţim rada bagera i izbor tehnoloških parametara bloka, odreska i reza, geometrije vedrica i zuba itd. Poseban problem se javlja kod otkopavanja materijala povećane ĉvrstoće, što je ĉest sluĉaj na našim površinskim kopovima. Dimenzionisanje specifiĉne sile kopanja bagera prema manjim masama izuzetno ĉvrstog materijala je neracionalno i rešenje ...
    rotorni bager, parametri reza, otpor na kopanje, dinamika bagera, kapacitet, optimizacija, specifična potrošnja energije
    ... OF MATERIALS WITH INCREASED STRENGTH Summary Mining of material by a bucket wheel excavator is a very complex physical physical-mechanical process. Indicators of the effectiveness of this process depends on a number of various factors, of which in particular may be emphasized: physical- ...
    ... stics of the material to be mined, mode of excavator operation and selection of block technological parameters, slice and cut, and the geometry of the buckets and teeth, etc. A particular problem occurs in the excavation of materials with increased strength, which is often the case in our opencast ...
    ... during selection and the optimal use of bucket wheel excavators in opencast mines in the working environment with the increased resistance to mining. Researches within this thesis were implemented at the theoretical and experimental levels. In this way was perceived an open and determined problem ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... the working of the basic machinery, lowers the production and may lead to breakdowns or endanger the people. In open-cast coal mines, dozers often work under aggravated conditions with the materials of different physical–mechanical qualities and under variable weather conditions. Under such circumstances ...
    ... the working of the basic machinery, lowers the production and may lead to breakdowns or endanger the people. In open-cast coal mines, dozers often work under aggravated conditions with the materials of different physical-mechanical qualities and under variable weather conditions. Under such circumstances ...
    ... analysis covered four different machine manufacturers, and to provide the necessary objectivity in the interpretation of the results of the analysis, the prefix Type (T1, T2, T3, T4) will be used instead of the names of the manufacturers. 2. Materials and Method 2.1. The Usage of the Dozers in Open-Cast ...

  • Процена ризика од загађивања водних ресурса под утицајем напуштених рударских радова на простору Србије

    Nebojša B. Atanacković (2018-08-31)
    Велики број напуштених рударских радова и ограничена средства за рекултивацијуи ремедијацију деградираних простора подстакле су развој метода за издвајањеприоритетних локација на које је потребно усмерити даља истраживања. У датомконтексту, у склопу израде дисертације спроведене су научно-истраживачкеактивности које су за предмет имале анализу утицаја значајнијих напуштенихрударских радова на водне ресурсе на простору Србије јужно од Саве и Дунава.Разматрање предметне проблематике извршено је кроз развој и примену семи-квантитативне методологије за анализу ризика од загађивања површинских иподземних вода на регионалној размери. Примењена ...
    анализа ризика, водни ресурси, водна тела, рудничке воде, рударскиотпад, аналитички хијерархијски процеси, кластер анализа, математичка теоријаатрибута, функције припадности, семи-квантитативне методе
    ... Lake Chemistry. Mine Water and the Environment 22: 194–205. doi 10.1007/s10230- 003-0022-y 28. Davis A. and Eary L.E. (1997) Pit lake water quality in the Western U.S.: An analysis of chemogenetic trends. Mining Eng 6: 98-102 29. DEFRA (2011) Guidelines for Environmental Risk Assessment and Management ...
    ... Nordstrom D.K., Jambor J.L. (1994а) Secondary minerals and acid-mine water chemistry. Short course handbook on environmental geochemistry of sulfide mine wastes. Mineralogical Assoc of Canada, Waterloo. 2. Alpers C.N., Nordstrom K.D., and Thompson M.J. (1994б) Seasonal Variations of Zn/Cu Ratios ...
    ... Environ 32(4):321-330. doi 10.1007/s10230-013-0236- 6 60. Güler C., Thyne G.D., McCray J.E. and Turner A.K. (2002) Evaluation of graphical and multivariate statistical methods for classification of water chemistry data, Hydrogeology Journal 10, Pp. 455-474. 61. Gzyl G. & Banks D. (2007) Verification ...

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • 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
    ... during the 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 ...
    ... 44. Güler, C., Thyne, G. D., McCray, J. E. and Turner, A. K. (2002) “Evaluation of graphical and multivariate statistical methods for classification of water chemistry data.” Hydrogeology Journal 10, Pp. 455-474. 45. Guo, Q., Wang, Y., Ma, T. and Ma, R. (2007) “Geochemical processes controlling ...
    ... 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 di ...

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... organic materials and decomposition of carbonates (Milheiro et al., 2005; Baccour et al., 2008; Abdelmalek et al., 2017). The chemical composition of the CC temper indicates that the raw material has high CaO and SiO, contents (28.8 and 27.5 wt.%, respectively) and low Al,Os, Fe)»Os and Na»O contents ...
    ... calcite and hematite. The clay body sample is a mixture of raw clay and crushed calcite in a ~50:50 ratio, which was confirmed using various techniques. We ave also considered and investigated the technological potential of the sampled materials, taking into consideration their actual and potential ...
    ... Milošević!* (%, Mihovil Logar! and Biljana Djordjević? 1University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia and ŽNational Museum in Belgrade, Belgrade, Serbia Abstract 'The production of pottery in the traditional manner using local raw materials can provide insights into the ...

  • Integrated Stratigraphy of the Middle–Upper Jurassic of the Krížna Nappe, Tatra Mountains

    Renata Jach, Nevenka Đerić, Špela Goričan, Daniela Reháková (2014)
    carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Krížna Nappe, West ern Carpathians, Tethys
    ... study from the Tatra Mountains, Poland. Palaeogeography, Palaeoclimatology, Palaeoecol- ogy, 213: 133—151. Gruszczynski, M., 1998. Chemistry of Jurassic seas and its bearing, on the existing organic life. 4cta Geologica Polonica, 48: 1-29. Guzik, K., 1959. Notes on some stratigraphic problems ...
    ... Western Tatra Mountains. A. L, Lb and Ld composite section. B. Lc section. Lithology, biostratigraphy (including position of the radiolarian and calcareous dinoflagellate and calpionellid samples) and results for carbon and oxygen isotope measurements, CaCOy content and microfacies analysis. Age denotes ...
    ... 17 (Polak and Ondrejičkov4, 1995); 18 (Plašienka and Ožvoldov4, 1996: Plašienka, 2012); 19 (Rakus and Ožvoldov4, 1999); 20, 22, 23, 25, 27, 29 (this study); 21, 24, 28 (Pol4k ef a/., 1998); 26 (Bak, 2001); 3035 (Polak and Ondrejičkova, 1993); 36 (Polak and Ožvoldov4, 2001); 37 (Sykora and Ožvol, ov4 ...

  • Regulacija nivoa tečne faze u vertikalnim separatorima

    Katarina Šoštarić (2024)
    Ovaj diplomski rad bavi se regulacijom nivoa tečne faze u vertikalnim separatorima u industriji nafte i gasa. U radu su istraženi različiti metodi merenja nivoa, uključujući plovke, ultrazvučne i radarske senzore. Radarski senzori su se pokazali kao najefikasniji u teškim radnim uslovima, zahvaljujući njihovoj visokoj preciznosti i pouzdanosti. Rad uključuje teoretski pregled metoda merenja nivoa, detaljno poređenje prednosti i nedostataka različitih senzora, kao i studiju slučaja implementacije radarskog senzora u vertikalnom separatoru. Analiza rezultata i preporuke za buduća istraživanja ...
    Merenje nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte i gasa
    ... paper includes a theoretical overview of level measurement methods, a detailed comparison of the advantages and disadvantages of different sensors, as well as a case study of the implementation of a radar sensor in a vertical separator. An analysis of the results and recommendations for future research ...
    ... separators in the oil and gas industry. Different methods of level measurement were investigated in the paper, including floats, ultrasonic and radar sensors. Radar sensors have proven to be the most effective in difficult working conditions, thanks to their high precision and reliability. The paper ...
    ... research and improvement are also presented. Keywords: Level measurement, Vertical separator, Radar sensors, Ultrasonic sensors, Oil and gas industry 1. UVOD Diplomski rad rađen na temu “Regulacija nivoa tečne faze u vertikalnim separatorima” sastoji se iz opšteg i specijalnog dela. Merenje ...