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603 items

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје
    ... Still, none of these methods is exact, since some of them (e.g. numerical methods) deal with the finite size effects, while the others (like the renormalization group approach) deal with the more or less robust approximations. Thus, it is always useful to have various methods that would serve for the ...
    ... way on the cubic three-dimensional, square two-dimensional and hexagonal two- dimensional lattices are in agreement with those found by traditional methods which evidences the applicability of the proposed tool. © 2021 Elsevier B.V. All rights reserved. 1. Introduction The avalanche-like response of ...
    ... al. Physica A 572 (2021) 125883 in three dimensions regarding the existence of nontrivial critical behaviour [24–26], whilst the non-perturbative methods have led to better results [27,28]. Some recent progress offered important answers on the universality principles [29,30], dimensional reduction [31] ...

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... Materials and methods The materials and methods chapter, and the results and dis- cussion chapter, follow Fig. 3, which displays the research workflow. Data sources, including multispectral satel- lite imaging, geophysical data, and geological data, are described in the materials and methods chapter ...
    ... ophiolites within the EVZ. KNN showed poorer results compared to RF in terms of both the evaluation metrics and visual analysis of prediction maps. The methods applied in this research can be applied for predictive mapping of complex geo-tectonic units covered by dense vegetation, and may indicate the presence ...
    ... tion, as noted by Rodriguez-Galiano et al. (2014), provides crucial information that aligns with geological expectations. Machine learning methods have demonstrated their efficacy as a valuable tool in geological mapping, because of that, applications in ophiolite mapping could provide sa ...

  • Savremeni pristup rešavanja problema industrijskog otpada

    Mariја Bošković (2024)
    Rad ukazuje na savremene metode rešavanja problema industrijskog otpada, sa posebnim fokusom na pećnu prašinu koja nastaje tokom metalurških procesa, poput proizvodnje čelika u elektrolučnim pećima. U radu se detaljno razmatra hemijski sastav pećne prašine, koja sadrži teške metale poput cinka, olova i kadmijuma, i naglašavaju ekološki izazovi koje predstavlja njeno zbrinjavanje. Takođe, analiziraju se metode tretmana i valorizacije pećne prašine, uključujući pirometalurške i hidrometalurške procese, pri čemu je poseban akcenat stavljen na reciklažu cinka iz pećne prašine. Dalje, ...
    prašina, elektrolučna peć, cink, teški metali, reciklaža
    ... valuable metal, can be reused in industry. Special attention is given to innovative methods that enhance the efficiency of recycling processes and reduce the amount of waste requiring permanent disposal. These methods contribute to more sustainable resource management and reduce the negative environmental ...
    ... ekonomski izvodljiva rešenja za reciklažu i/ili smanjenje prašine iz elektrolučne peći, neophodno je razumeti proces formiranja prašine [7]. fume extraction duct graphite electrodes oI q MBIN ? o CO-bubbles scraps and additives (coal, lime...) . %n lance liquid bath Slika 6. Šematski ...
    ... prema postupku prikazanom na slici 23. Ovaj postupak omopgućava optimalno razlaganje čestica i dobru ponovljivost merenja [7]. 42 Continuous mechanical i || E agitation ı 3 =s — || dii colnm:luous ultrasonic 2 ,i·dn 1 min USA by period of 15 s 1min 1 min USA by period of 15 s agitation ...

  • Geotechnical Conditions for Construction of Savski Trg Metro Station as a Part of the Belgrade Metro Line One

    Nemanja Stanić, Dragoslav Rakić, Josip Isek, Slavoljub Simić (2024)
    In order to solve serious traffic congestion in Belgrade, a number of studies regarding the Belgrade Metro construction have been carried out since 1973. However, only in 2019, the routes of the future metro lines 1 and 2 were defined as a part of the General Metro Construction Project. The lines are designed to intersect at the location of Sava Square, where an interchange metro station will be built. It represents a complex geotechnical structure consisting of three different ...
    metro station, geotechnical modelling, displacements

  • Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia

    Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)
    Stratigraphy,Economic Geology,Geology,Geophysics,Oceanography
    ... tion (ICCP System 1994). Fuel 80, 459–471. ISO 7404-2, 2009. Methods for the Petrographic Analysis of Coals - Part 2: Methods of Preparing Coal Samples. Organization for Standardization, Switzerland, pp. 12. ISO 7404-3, 2009. Methods for the Petrographic Analysis of Coals – Part 3: Method of N. Burazer ...
    ... bitumen were carried out using microscopic techniques of transmitted white and incident blue lights. 3.7. Organic geochemical analysis The Soxhlet extraction was performed on thirty-eight selected samples (Table 6) to extract the soluble OM (bitumen, EOM). The ex- traction was done with an azeotrope mixture ...
    ... mixture of methanol and di- chloromethane (1:7.6, v:v) for 36 h. Copper was added to the mixture in order to remove elemental sulphur during the extraction process. The saturated, aromatic, and NSO (polar fraction, contains nitrogen, sul- phur, and oxygen compounds) fractions were isolated from bitumen ...

  • A methodology for assessing the pressures on transboundary groundwater quantity and quality – experiences from the Dinaric karst

    Zoran Stevanović, Veljko Marinović (2020)
    A relatively novel and abridged methodology for assessing the quantity and quality status of groundwater bodies has been applied in the Dinaric karst of SE Europe. Validation of pressure on quantity is based on groundwater budgeting and the correlation of available groundwater reserves and projected water demands, while pressure on quality is estimated by GIS-created maps: vulnerability – hazard – risk. The results obtained from the studied groundwater bodies indicate mostly low pressure on water quantity, but increased risk from diffuse and point pollution sources. ...
    međugranična izdan, karst, ranjivost, hazard, rizik, Dinaridi

  • 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

  • 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
    ... metoda merenja nivoa *Izvor: Članak 'What are the electrical methods of level measurement' sa sajta AutomationForum.co, pristupljeno 26. jula 2024. godine. Dostupno na: https://{automationforum.co/what-are-the-electrical-methods-of-level-measurement/ Mopu se realizovati i u vidu signalizatora ...
    ... -and-gas-process_fig5_335728535 7. Članak 'What are the electrical methods of level measurement' sa sajta AutomationForum.co, pristupljeno 26. jula 2024. godine. URL: https://automationforum.co/what-are-the-electrical-methods-of-level- measurement/ 8. Članak 'Ultrasonic sensor based water level ...
    ... gasa ABSTRACT This thesis deals with the regulation of the liquid phase level in vertical 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 ...

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja

  • Geochemistry of neutral mine drainage at sulfide deposits ‒ example of the „Grot“ Pb-Zn mine, South-Eastern Serbia

    Snežana Kretić, Jana Štrbački, Nebojša Atanacković (2024)
    U ovom radu proučavan je hemijski sastav voda iz rudnika i izdvojeni su hidro-geohemijski faktori koji utiču na njegovo formiranje. Sakupljeno je 11 uzoraka vode sa 6 lokacija na području Krive Feje, kako bi se utvrdio njihov hemijski sastav. Analizom podataka utvrđeno je da su vode sa ovog područja visokog kvaliteta, HCO3--SO42--Ca2+ i SO42--Ca2+ tipa, sa neutralnom pH vrednošću. Koncentracije metala u ovim vodama (cinka, olova, barijuma, bakra i hroma) generalno su niske i većina uzoraka voda ispunjava kriterijume ...
    podzemne vode, kisele rudničke vode, hidrogeohemijski faktori, metali, PHREEQC modeliranje, indeks saturacije

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... studied for CO» capture from flue gas or other effluent streams. Although inorganic membranes can withstand high temperatures and often have mechanical stability, their high costs stili hamper their commercialization. Inorganic membranes have not yet been demonstrated on a large scale, and in fact ...
    ... analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion methods. Each approach is dissected to elucidate its advantages, limitations, and technological advancements, providing a comprehensive view of the evolving ...
    ... of the master thesis explores the complex domain of carbon storage and transport. The assessment of geological, oceanic, and terrestrial storage. methods underscores the importance of site selection, safety protocols, and monitoring systems in ensuring the long-term viability of stored CO-». Throughout ...

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • Održivo korišćenje mađarsko-srpskih međugraničnih vodnih tela

    Dušan Polomčić, Zoran Stevanović, Saša Milanović, Stanko Sorajić, Bojan Hajdin, Željko Kljajić (2010)

  • Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

    Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)
    Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...
    Geochemistry and Petrology
    ... and extracted (Soxhlet) with dichloro- methane/methanol azeotrope (15:2, v:v) for 42 h. Copper was added to remove elemental sulphur during the extraction process. Asphaltenes were precipitated using n-hexane. Asphaltene-free bitumen (maltenes) was chromatographed on open columns with silica-gel/n- ...
    ... pulverized and extracted (Soxhlet) with dichloro- methane/methanol azeotrope (15:2, v:v) for 42h. Copper was added to remove elemental sulphur during the extraction process. Asphaltenes were precipitated using n-hexane. Asphaltene-free bitumen (maltenes) was chromatographed on open columns with silica-gel/n- ...
    ... ambiguous interpretation and geminal correlations are omitted for clarity. The illustrated conformations were obtained by energy minimization using MM2 methods available in the Chem3D Pro software (PerkinElmer). (a) trans-dehydroicetexane, (b) cis-dehydroicetexane. 16 H.P. Nytoft et al. / Organic Geochemistry ...

  • DNA/BSA interactions and cytotoxic studies of tetradentate N,N,O,O Schiff base copper(II) complexes

    Aleksandar Mijatović, Angelina Caković, Aleksandar Lolić, Snezana Sretenović, Marko Živanović, Dragana Seklić, Jovana Bogojeski, Biljana Petrović (2023)
    Three Schiff base Cu(II) complexes, (N,N’-bis(acetylacetone)propylenediimine)copper(II) complex, [Cu(acac2pn)] (1), (N,N'-bis-(benzoylacetone)propylenediimine)copper(II) complex, [Cu(phacac2pn)] (2) and (N,N’-bis-(trifluoroacetylacetone)propylenediimine)copper(II) complex, [Cu(tfacac2pn)] (3), were used to investigate the interactions with calf thymus DNA (ct-DNA) and bovine serum albumin (BSA) using the electronic absorption and spectroscopic fluorescence methods. UV-Vis absorption studies showed that studied complexes interact with DNA molecule and exhibit moderate binding affinity. Fluorescence studies of complexes 1-3 also showed a possibility for DNA intercalation as well as a relatively high binding ability ...
    General Chemistry

  • Distant Reading in Digital Humanities: Case Study on the Serbian Part of the ELTeC Collection

    Ranka Stanković, Cvetana Krstev, Branislava Šandrih Todorović, Duško Vitas, Mihailo Škorić, Milica Ikonić Nešić (2022)
    In this paper we present the Serbian part of the ELTeC multilingual corpus of novels written in the time period 1840-1920. The corpus is being built in order to test various distant reading methods and tools with the aim of re-thinking the European literary history. We present the various steps that led to the production of the Serbian sub-collection: the novel selection and retrieval, text preparation, structural annotation, POS-tagging, lemmatization and named entity recognition. The Serbian sub-collection was published ...
    Corpus, Distant Reading, Digital Humanities, Linked Data, Named Entity Recognition, Text Analytics

  • Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4

    Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)
    In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...

  • Sexual dimorphism and left-right asymmetry of carapace ornamentation in Hemicytheria setosa RUNDIĆ 2002

    Vukica Vujić, Ljupko Rundić, Tamara Karan-Žnidaršič (2019)
    In biostratigraphic research of the Upper Miocene of the Pannonian Basin System, one of the frequently detected and important ostracod genera is Hemicytheria. Among more than 20 species of this genus, Hemicytheria setosa is present in sandy facies of the Lake Pannon sediments in Serbia and Bosnia and Herzegovina. The aims of this study were to describe sexual dimorphism and differences between left and right valve morphology in Hemicytheria setosa. Landmark based geometric morphometrics is applied on the grounds ...
    Morfologija ljušture, Ostrakode, geometrijska morfometrija, gornji miocen, južni deo Panonskog basena

  • Applicability of the risk ranking methodology designed for water reservoirs to tailings storage facilities

    Dragana Nišić, Dinko Knežević, Aleksandar Cvjetić, Neda Nišić, Vladimir Jovanović (2022)
    The risks associated with operating water reservoirs and tailings storage facilities (TSFs) are different because of their different purposes, methods of construction and operation, and characteristics of the materials impounded and their flow behaviour. Regardless of the differences, these two types of structures are often put in the same category when it comes to risk assessment and the application of relevant methodologies, which may result in unrealistic outcomes. In this paper we investigate whether it is possible to apply ...
    procena rizika, akumulacije za vodu, jalovište, TSF, ICOLD, FMEA