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Упит dcterms_subject_txt:mathematical content

477 items

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... of adhesion in mortars with a higher content of waste material is the lower quantity of free water necessary for the hydration of cement materials in the hardening period. Based on the results of concrete consistency testing, it can be concluded that as the content of waste material increased, the size ...
    ... free water in the concrete mixture, and thus the consistency [16,21,22]. The content of air entrained into fresh concrete increased with an increasing percentage of cement replacement with waste material. By increasing the content of waste material, the bulk density of concrete in the fresh and hardened ...
    ... tons [3,5,6]. However, besides its good properties, lignite also has some significant disadvantages such as calorific value, high-combustion waste content, the release of polluting gases (SOx, COx, PxOy, etc.) which may cause serious environmental problems (the greenhouse effect, soil or water contamination ...

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • An oilfield in Libya: A new model to enhance waste water disposal

    Dušan Danilović, Vesna Karović Maričić, Nori Elhaddad, Branko Leković (2016)
    нафта, лежишне воде, припрема

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... damage larger or smaller areas of land. Experiences show that land damage is significantly greater with the surface exploitation system, where the content of the space is degraded not only in the contour of the mine and the surrounding area, but changes are made in the natural flows and conditions ...
    ... of land reclamation. For agricultural land reclamation, especially after restoration of the original use of arable land, acceptance of the main content should include: reclaimed land area, surface cover thickness, ground slope and drainage function, the physical and chemical properties of the soil ...
    ... chnical and project documentation, and the scope of recultivation and rehabilitation works is also determined by the valid regulations on the content of project documentation. The set of laws in the field of environmental protection also includes the protection of land from physical degradation ...

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

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita
    ... digital objects management Omeka2, as a web publishing platform and a content management system (CMS) was selected. It is developed by the Centre for History and New Media (CHNM) at George Mason University specially for scholarly content, with an emphasis on digital collections and exhibits. While Omeka ...
    ... For each category or subcategory, it is possible to define a specific collection that will display the entire content of the collection. Apart from navigation and browsing of content, simple and advanced search are available. The administrator panel enables installing and customizing the appearance ...
    ... over 5500 pages of plain text is created and prepared for publication as an online resource for full text search using Omeka, an open source content management system for on line digital library development. Search capabilities, both full text and metadata search are customized and improved by ...

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

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... 216 0.560 0.386 0.691 Protein content (%) 0.170 0.616 0.276 0.765 Moisture content (%) 0.277 0.569 0.487 0.629 Oil content (%) 0.290 0.016 17.818 0.001 Cellulose content (%) 0.098 0.016 6.127" 0.021 Starch content (%) 0.760 2.484 0.306 0.744 Mineral content (%) 0.026 0.016 1.628 0.249 Effect ...
    ... 052 96.198"% 0.000 Protein content (%) 3.716 0.225 16.121% 0.002 Moisture content (%) 3.123 0.196 18.005% 0.001 Oil content (%) 0.062 0.067 0.925 0.359 Cellulose content (%) 0.116 0.022 5.174* 0.046 Starch content (%) 17.395 0.649 26.821*% 0.004 Mineral content (%) 0.064 0.013 4.883 0.052 ...
    ... 013 0.010 1.315 0.336 Protein content (%) 0.455 0.167 5.714* 0.035 Moisture content (%) 0.174 0.176 0.988 0.426 Oil content (%) 0.001 0.014 0.045 0.956 Cellulose content (%) 0.001 0.004 0.189 0.832 Starch content (%) 0.510 0.657 0.775 0.502 Mineral content (%) 0.032 0.002 3.949 0.675 ”*non ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)
    ... 2007-2011. (together with the Institute for water management “Jaroslav Cerni”), STEVANOVIĆ, Z. 2009., Translation of the published cartographic content and the content of the legend for the Basic geological map (OGK) into the format of the Geological information system of Serbia (GeolISS) 2008-2009, JEMCOV ...
    ... different geological research funded by the MEMSP before entering them into the geological database, we realised that certain data, which by their content and structure did not cor- respond to the initial geological database design, could still be interesting to the expert public. Because of this, the ...
    ... and classical web applications. The portal (http://geoliss.ekoplan.gov.rs) features geological maps as well a web GIS maps, dif- ferent multimedia content, and it also offers the possibility of online database search. This paper presents tech- nologies and tools used to develop the portal for geological ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... since the level of aluminum content in asbestos is low or even nil. The main characteristic is the high content of MgO (~20 wt %), except for in two spots with low content (8 and 12 wt %) and one spot with a very low content (~2 wt %, but also alumina-rich). The CaO content ranges between ~3 and 20 ...
    ... 50 Hm? area. Silica content ranges between 50 and 55 wt %, except for in three spots with lower values (40 and 5 wt %) and one spot with a much higher content (~60 wt %). The low-silica spot corresponds to a grain made of iron oxide (Fe)»Os = 88 wt %). The alumina content is low (~2-7 wt %), except ...
    ... heating above ~700 *C. Comparison of the IR patterns in Figure 3 shows that the lowest OH content, based on the intensity of the 3670 cm-! narrow band, is measured for the c and d samples, and the lowest water content is also found for these samples (measured by the lower intensity of the 3200 cm—! broad ...

  • Geoheritage and Mining Heritage in the Promotion of Theme Parks: An Example of the National Park Đerdap (Carpathian-Balkan Thrust-And-Fold Belt, Eastern Serbia)

    Ivana Mojsić Velikić, Dragoman Rabrenović, Danica Srećković-Batoćanin, Darko Spahić (2022)
    The National Park Đerdap (eastern Serbia, vicinity of the Danube River) occupies a segment of the Carpathian-Balkan fold-and-thrust belt and has a significant geoheritage potential, accounting for the impressive natural (geological) and cultural legacy. In addition to the extraordinary orogenic-type landscape or nappe-stacked mountainous configura tion, the region contains evidence of ancient mining activities, uncovered within its immediate neighbourhood. The ancient mining activities date back a few thousand years ago and represent a solid ground for the idea of ...
    Karpatobalkanski pojas nabora i navlaka, Geopark Djerdap, Tematski park "Muzej rudarstva", Konzervacija, Održivi razvoj, Geotopi, Srbija

  • Characterization of bituminite in Kimmeridge Clay by confocal laser scanning and atomic force microscopy

    Paul C. Hackley, Jolanta Kus, João Graciano Mendonça Filho, Andrew D. Czaja, Angeles G. Borrego, Dragana Životić, Brett J. Valentine, Javin J. Hatcheries (2022)
    This work investigates bituminite (amorphous sedimentary organic matter) in Upper Jurassic Kimmeridge Clay source rock via confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). These petrographic tools were used to provide better understanding of the nature of bituminite, which has been historically difficult to identify and differentiate from similar organic matter types in source rocks. As part of an International Committee for Coal and Organic Petrology (ICCP) working group, an immature (0.42% vitrinite reflectance), organic-rich (44.1 wt% ...
    Битуминит, Kонфокална ласерска скенирајућа микроскопија, Mикроскопија атомских сила, Органска петрологија, Термичка зрелост

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... for determining humus and clay content, hygroscopic moisture content, pH value and soil sorption capacity have been presented in Table III. Table III. Display of hygroscopic moisture, humus, clay and sand content, soil sorption capacity and pH. Soil type Content, % q / mg g-1 pH Moisture Humus ...
    ... the hygroscopic moisture content. Mineralogical soil sample composition was determined by X-ray diffraction method (Rigaku SmartLab, X-ray diffractometer) under the conditions provided in Table I. The humus content has been determined by volumetric method15 and the clay content by hydrometric method ...
    ... before it is published in its final form. Please note that during these publishing processes, many errors may emerge which could affect the final content of the manuscript and all legal disclaimers applied according to the policies of the Journal. https://doi.org/10.2298/JSC211006095N ...

  • 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
    ... as reported by the pottery manufacturers ( ). The CIMx sample has a large calcite content ( ). When com- paring the oriented patterns, calcite addition is evident in the CIBd sample, which has a smaller clay content than the CIMx sample. The semi-quantitative estimation of the mineral phases obtained ...
    ... industrial prop- erties of the CIBd sample, in terms of brick production, might be enhanced by adjusting the grain size and content of CC added according to the clay content. This remains to be investigated. Conclusion The main focus of this investigation was the mineralogical ana- lysis of the ...
    ... Na»O contents (Table 1). The slightly larger amounts of Al,O; and Na»O are due to contamination by clay minerals during milling. The large CaO content is related to the abundant carbonates, which are also 150 -, sample CIMx 125 -| in te ns it y (c ou nt s) in te ns it y (c ou nt s) ...

  • Multi-word Expressions for Abusive Speech Detection in Serbian

    Ranka Stanković, Jelena Mitrović, Danka Jokić, Cvetana Krstev (2020)
    Ovaj rad predstavlja istraživanja na usavršavanju i unapređenju srpske verzije rečnika Hurtlex, višejezičnog leksikona uvredljivih reči. Posebnu pažnju posvećujemo dodavanju izraza sa više reči (polileksemskih jedinica) koji se mogu smatrati uvredljivim, jer su takvi leksički zapisi veoma važni za postizanje dobrih rezultata u mnoštvu zadataka otkrivanja uvredljivog jezika. Srpski morfološki rečnici se koriste kao osnova za čišćenje podataka i stvaranje rečnika. Istaknuta je veza sa drugim leksičkim i semantičkim resursima na srpskom jeziku i predviđena je izgradnja sistema za ...
    uvredljiv govor, govor mržnje, leksički izvori, višejezični leksikon, izrazi sa više reči
    ... further development of the system could go in the direction of adding weight factors to the components (neutral, less neutral and offensive content and explicit content) which could be used to calculate the overall importance of a news item for the examined topic. 2.2 Multilingual HurtLex HurtLex is a ...
    ... online media and the Internet in gen- eral. The concept of abusive speech, as an umbrella term for phenomena such as offensive and hate speech, its content and forms of expression are analysed, trying to define its vocabulary, collocations, colloquial expressions, and context. Starting from the definition ...
    ... and rules. They used semantics and subjectivity features – polarity, intensity, and subjectivity level of words, using the domain corpus of hateful content and Subjectivity lexicon of Therese Wilson in combination with the SentiWordNet (Esuli and Sebastiani, 2006).For clas- sification, they leveraged rules ...

  • Contribution to the geotechnical classification of municipal waste landfills in Serbia

    Dragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić (2018)
    Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental Engineering

  • Developing Students’ Mining and Geology Vocabulary Through Flashcards and L1 in the CLIL Classroom

    Lidija Beko, Ivan Obradović, Ranka Stanković (2015)
    ... rs/term/ 4. USE OF L1 IN CLIL According to Lasagabaster (2013) “the use of the first language, if judicious, can serve to scaffold language and content learning in CLIL contexts, as long as learning is maintained primarily through the L2” (p.17). The supporters of periodical usage of L1 in the CLIL ...
    ... improving L2 proficiency. 5. MINING AND GEOLOGY TERMINOLOGY Using authentic teaching materials, encompassing demanding language input and subject content, inevitably expose our students to complex mining and geology terminology. At the same time, many of the terms have not yet been translated into ...
    ... (Q2) (38.78%), moreover, many of the students agree that the method maximized the lexical improvement (Q3) (47.31%), closely relating the lexical content and method with the current students’ needs (Q4) (92.47%), only few (5.38%) labeled the method as discouraging. The findings suggest that L1, ...

  • ‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions

    Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban (2020)
    Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...
    Firing, Glaze, Traditional ceramics, Provenance studies, Augite

  • Горњокредне творевине северозападне Србије

    Bojan M. Glavaš-Trbić (2013-11-26)
    У раду су приказане палеогеографске карактеристике и геотектонски положајширег подручја (Јадарског блока и Вардарске зоне) које су утицале на условеталожења, односно карактеристике горњокредних творевина на простору данашњесеверозападне Србије.Описани су карактеристични локални геолошки стубови уз приказ њиховихлитолошких, биостратиграфских и седиментолошких карактеристика. При томе сукоришћена досадашња сазнања о предметном простору изложена у домаћим радовима,и извршена је компарација и корелација са подацима суседних терена, ширеперитетиског ареала.Истраживања у првој фази су вршена на међусобно удаљеним и релативномалим профилима – често само ерозионим крпама ...
    горња креда, стратиграфија, микрофосили, макрофосили, Јадарскиблок-Вардарска зона, СЗ Србија

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

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Boban Pavlović (2021)
    U narednom periodu se planira izgradnja nekoliko desetina sistema za prečišćavanje otpadnih voda u većim gradovima u Srbiji. Iskustva iz postrojenja koja su trenutno u radu, pokazuju da bi prečišćena otpadna voda, s obzirom na protok i temperaturu, mogla da predstavlja značajan izvor obnovljive energije. U radu su prikazani primeri dobre prakse korišćenja ove energije u sistemima daljinskog grejanja u zemljama Evropske unije. Analiziran je rad postrojenja za prečišćavanje otpadnih voda u Šapcu i razmotrena je mogućnost njegovog korišćenja ...
    toplotna pumpa, sistem daljinskog grejanja, postrojenje za prečišćavanje otpadnih voda
    ... org/annex47/wp-content/uploads/sites/54/2018/12/annex-47hammarbyverket.pdf https://heatpumpingtechnologies.org/annex47/wp-content/uploads/sites/54/2018/12/annex-47hammarbyverket.pdf https://www.friotherm.se/wp-content/uploads/sites/4/2017/11/E11-15_Turku-Energia.pdf https://www.friotherm.se/wp-content/upload ...
    ... Technologies, https://heatpumpingtechnologies.org/annex47/wp- content/uploads/sites/54/2018/12/annex-47hammarbyverket.pdf [pristupljeno 17.01.2021] [8] Turku Energia – Ecological heating and cooling, https://www.friotherm.se/wp-content/uploads/sites/4/2017/11/E11- 15_Turku-Energia.pdf; https://e ...