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Упит dcterms_subject_txt:Natural two dimensional materials

747 items

  • Assessment of environmental radioactivity and health hazard at Stara Planina region

    Slavko Dimovic, Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Radoje Bankovic (2021)
    Циљ студије је био да се процени потенцијални ризик од зрачења у близини напуштених рудника уранијума, јаловишта или лежишта уранијума на Старој планини у Србији. За процену ризика одређено је неколико параметара: активност еквивалента радијума, Raeq, екстерни индекс опасности, Hex, брзина апсорбоване дозе гама зрачења, D, годишња ефективна доза на позадинској експозицији гама гама на отвореном, AEDoutdoor и ризик од рака током живота, ELCR. Добијени резултати су показали да сви узорци, осим једног, имају Raeq вредност и до два ...
    природна радиоактивност, животна средина, здравље, опасност, процена ризика

  • 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

  • Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2

    Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)
    Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...
    Metals and Alloys, Biochemistry, Biomaterials, Biophysics, Chemistry (miscellaneous)
    ... 5C). There are two new low intense, but rather broad peaks centred at m/z = 14 381 and at m/z = 14 546. Considering the fact that [RuCl2(bipy)2]Cl rearranges in aqueous solution, as it has been described above, these two new peaks can be regarded as association complexes of these two later ruthenium ...
    ... apparently converted in the aqueous environment into two different species, one losing all chloride anions, and another replacing them with one more bipy ligand. Thus, the two new mass peaks can be regarded as association complexes of these two later ruthenium complexes with PLA2. In the case of ...
    ... knowledge of interaction between phos- pholipase A2 and metallo-drugs can be later exploited in further development of therapeutic strategies. Materials and methods Chemicals Platinum and ruthenium complexes ([PtCl4(bipy)] tetrachloro- (bipyridine) platinum(IV) and [RuCl2(bipy)2]Cl dichloro- ( ...

  • 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
    ... Figure 4.7 shows a depleted o1l and gas field with existing platforms. Natural dr retri to SedSIUTIH Figure 4.7 A depleted oil and gas field for CCUS. 5. CARBON TRANSPORT Carbon transport can be categorized into two transport modes thus modular transport which entails transport by ship ...
    ... low- temperature materials[29]. The primary classes of high-temperature materials include alkali or alkaline-earth oxides such as calcium oxides, alkali silicates and zirconates, as well as double salts, whereas low-temperature adsorbents cover conventional porous materials such as zeolites, ...
    ... the 150 MW coal power plant ensure safe and clean air. Blue hydrogen is an industry term for hydrogen produced from natural gas and supported by carbon capture and storage. Natural gas is split into hydrogen and CO» by reforming and the resulting CO> emission is captured and stored in underground ...

  • Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides

    Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)
    analogno modelovanje, raspodela deformacija, geometrija indentera, Černa i Timok rasedni sistem
    ... Cruden, A.R., Betts, P.G., 2017. Interactions between propagating rotational rifts and linear rheological heterogeneities: insights from three dimensional laboratory experiments. Tectonics 36, 420–443. https://doi.org/ 10.1002/2016TC004447. Molnar, N.E., Cruden, A.R., Betts, P.G., 2019. Interactions ...
    ... geometrical, rheolog- ical and kinematical similarities between natural systems and models (Hubbert, 1937; Ramberg, 1981; Weijermars and Schmeling, 1986; Davy and Cobbold, 1991). Densities of our material of 1500 kg/m3 represent natural upper to middle crust densities of 2750 kg/m3, yielding a de ...
    ... the rigid block, the deformation after 1 cm of displacement is mostly accommodated by the two early formed N–S oriented strike-slip faults (1 and 2 in Fig. 3a). In the early stages of deformation, these two faults are connected around the SW corner of the indenter to the E-W oriented shortening domain ...

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • 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

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... „A” (KO A) and „Kostolac B” (KO B). The physical properties of the ash and slag facilitate their use as building materials for transport infrastructure, reducing the use of natural resources inroad building projects. The chemical properties of fly ash and slag are the most important indicator in ...
    ... pro- perties, as well as the possibility of fly ash and slag application as a construction substitute thus preservinglimited reserves of natural building materials. 2. STUDY AREA PPNT A is the most important producer of electricity in Serbia and is built on the bank of the river Sava. PPNT A is 4 ...
    ... ing material for road construction and other trafficked areas. The using of fly ash and slag as secondary materials for road construc- tions, saves huge amounts of standard building materials (stone, gravel, sand), which are non-renewable. Most of the research is based on an examination of the chemical ...

  • 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

  • Uniaxial compressive strength test before and after standard fire test on rock mass

    Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)
    ... thermotechnics and fire protection. Standard furnace for structural testing consists of four two-stage liquid fuel burners of the type "Major P25 AB HS TL V.C.", thermal power 296 kW manufactured by ECO FLAM. Two differential pressure transmitters type 6321 manufactured by TESTO (Germany), with a range ...
    ... of Civil Engineering, University of Belgrade, Serbia b Faculty of Mining and Geology, University of Belgrade, Serbia c Institute for testing materials IMS, Belgrade, Serbia d Unogradnja V.V. Belgrade, Serbia ABSTRACT The paper presents uniaxial compressive strength test according ...
    ... Institution of Mining and Metallurgy, London. Wittke, W., 2014, Rock Mechanics Based on an Anisotropic Jointed Rock Model (AJRM) SRPS EN 1926:2007, Natural stone test method - Determination of compressive strength SRPS EN 1363-1:2014, Fire resistance tests - Part 1: General requirements ...

  • Fragmentation Size Prediction of Blasted Material Using a Specialized Software for Drilling and Blasting

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić, Miljan Gomilanović (2024)
    Design and optimizing the drilling and blasting parameters, should fill the requirements for the capacity, fragmentation size, and technical characteristics of loading and transport equipment, and enable a safe work at the open pit. Besides mentioned, it also achieves the minimal impact on the environment of the open pit and decreases the negative effects on the environment, especially in the blast vibration and flyrock. To obtain the best possible blasting effects and consider all the factors, a specialized software is ...
    optimization, O-Pitblast, drilling, blasting, fragmentation size

  • Substitution reactions of some novel sterically hindered monofunctional Pd(II) complexes

    Aleksandar Mijatović, Jovana Bogojeski, Biljana Petrović, Živadin D. Bugarčić (2011)
    Reakcije supstitucije monofunkcionalnih kompleksa [(TLtBu)PdCl]+ i [Pd(tpdm)Cl]+, gde je TLtBu = 2,6-bis[(1,3-di-terc-butilimidazolin-2-imino)metil]piridin i tpdm = terpiridindimetan, sa nukleofilima kao što su: tiourea, I−, Br−, NO2−, piridin i dimetil-sulfoksid (DMSO) proučavani su u 0,1 M vodenom rastvoru NaClO4 u prisustvu 10 mM NaCl. Reakcije su sprovedene na tri različite temperature (288, 298 i 308 K) korišćenjem tehnike zaustavljenog protoka na različitim temperaturama. Reakcije supstitucije su praćene pod uslovima pseudo prvog reda sa velikim viškom nukleofila. Dobijeni rezultati pokazuju da kompleks ...
    Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry
    ... feature. It has two donor atoms. In studied reactions DMSO is first coordinated through the oxygen atom, where the negative partial charge is localizes. Than, the Pd(II)–O bond breaks forming the thermodynamically more stable sulfur-coordinated product. On the other side, the bulkiness of two methyl groups ...
    ... nucleophiles (Fig. 1) in 0.1 M NaClO4 aqueous solution and in the presence of 10 mM NaCl to prevent spontaneously hydrolysis. 2. Experimental 2.1. Materials and methods The ligands thiourea (Kemika, Zagreb), NaI, KBr, NaNO2, pyridine (Zorka, Šabac) dimethylsulfoxide (DMSO) (Fluka)wereusedwithout further ...
    ... nucleophiles (Fig. 1) in 0.1 M NaClO,4 aqueous solution and in the presence of 10 mM NaCl to prevent spontaneously hydrolysis. 2. Experimental 2.1. Materials and methods The ligands thiourea (Kemika, Zagreb), Nal, KBr, NaNOz, pyridine (Zorka, Sabac) dimethylsulfoxide (DMSO) (Fluka) were used without further ...

  • Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules

    Svetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón (2024)
    The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...
    Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analiza

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... “drill-down” and “slicing and dicing” [7]. In mine safety it is necessary to follow several attributes related to injuries, perform their multi-dimensional analysis, as well as display data in different forms. Data are presented in the form of OLAP cubes that contain measures and dimensions. Compared ...
    ... and efficient integration of new workers as well as retention of aging workers [3]. Business intelligence (BI) is closely related to KM and the two of them are often regarded as one and the same within the entrepreneurial community. However, BI is more focused on decision making using data w ...
    ... organizational structure of mine, shift and working day in which the injury occurred, the source and cause of the injury, etc. Figure 3 depicts two OLAP cubes. Each cell of the cubes holds a number of injuries. In the first cube (a) injuries are categorized according to the type of injury and the ...

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... according to multi-dimensional criteria. Criteria Alternatives WC A1 A2 A3 A4 C1 0.3488 0.4306 0 0.2847 0.2847 C2 0.3236 0.4189 0 0 0.5811 C3 0.1661 0.3330 0.2373 0.4297 0 C4 0.1615 0.1658 0.1909 0.1581 0.4871 Final rank 0.3678 0.0702 0.1962 0.3660 solar and wind in these two sectors could not be ...
    ... year in north-west Serbia to 1550 kWh/ m2/per year in south-east Serbia, while in the central part it is about 1400 kWh/m2/per year (RS2, 2016). 3. Materials and methods 3.1. Fuzzy AHP method As the method of the MCDA, FAHP systematically solves the problem using the concepts of fuzzy set theory and ...
    ... infer- tile soil if the basic condition in that area is met. • Biomass and biogas power plants — This includes power plants using biodegradable waste materials from agricul- tural production processes, forestry, and households, ma- nure from farms, products of forest management activi- ties, biodegradable ...

  • The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)

    Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov (2019)
    Geography, Planning and Development,Aquatic Science,Biochemistry,Water Science and Technology
    ... Department of Transportation; Materials Engineering and Testing Services; Cossosion Technology Branch. Corrosion Guidelines; The California Department of Transportation: Sacramento, CA, USA, 2003. 15. Al-Husseini, A.H.E. Study of potential Corrosion and Scaling for Treated Water of Two Water Treatment plants ...
    ... Introduction The presence of an underground structure in a karst can have a considerable impact on the natural status of groundwater and, conversely, the groundwater can affect the structure (the two are in constant interaction). In general, karst areas are risky for constructing underground tunnels, ...
    ... Introduction The presence of an underground structure in a karst can have a considerable impact on the natural status of groundwater and, conversely, the groundwater can affect the structure (the two are in constant interaction). In general, karst areas are risky for constructing underground tunnels, ...

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci
    ... developing students’ vocabulary related to raw materials through flashcards and L1 in the CLIL Classroom [23], but it was not finalized with publicly available online resources. Three digital resources already developed at UBFMG were included in our approach, two termbases, Termi [24], and GeoliSSTerm [25] ...
    ... in 31% of cases both have two components, in 15% of cases the Serbian term has one component more than the English term, while in 13% of cases the English term has one component more, in 5% of cases the Serbian term has two components more, and in 3% of cases English has two components more. All other ...
    ... presents the entry ‘accessory plate’ with five senses, marked by letters a-e. Two senses (a and e) are related to other dictionary terms (a to ‘quartz wedge’ by CF, and e to three synonyms and two other terms by CF), and two senses (b and c) are followed by their source (Pryor). Figure 2. An example ...

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • FrameNet Lexical Database: Presenting a Few Frames Within the Risk Domain

    Aleksandra Marković, Ranka Stanković, Natalija Tomić, Olivera Kitanović (2021)
    U radu se daje kratak prikaz teorije semantike okvira, na kojoj je zasnovana leksička baza Frejmnet. Predstavljena je koncepcija ove mreže, kao i mogućnosti njene primene. Predstavljena je i leksička analiza koja se primenjuje u projektu izrade Frejmneta i ukazano na razlike između analize zasnovane na okviru u odnosu na analizu zasnovanu na reči. Zatim je prikazano nekoliko povezanih okvira koje prizivaju reči iz domena rizika. U radu je predstavljena i platforma NLTК pomoću koje se mogu koristiti ...
    Srpski jezik, semantika okvira, FrameNet, scenario rizika, rudarski korpus, obrada prirodnog jezika
    ... Figure 4. Semantic frame Risk_scenario with a detailed view of two other related frames) 20 Infotheca Vol. 21, No. 1, September 2021 Scientific paper 3 NLTK FrameNet Wrappers NLTK (Natural Language Toolkit) is an easy-to-use natural language pro- cessing Python suite that accesses continually increasing ...
    ... evoked by words from the risk domain. FrameNet data is also readily available through the Python API included in the NLTK (Natural Language Toolkit) suite, which provides a good natural language pro- cessing resource. The last chapter shows a corpus search of the noun risk in a mining- themed corpus. We ...
    ... quency graphs. A word cloud for the word risk is also included. KEYWORDS: Serbian language, frame semantics, FrameNet, risk scenario, mining corpus, natural language processing. PAPER SUBMITTED: 15 July 2021 PAPER ACCEPTED: 6 September 2021 Aleksandra Marković aleksan- dra.markovic@isj.sanu.ac.rs Institute ...