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Упит dcterms_subject_txt:Rastvorne soli

521 items

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... forms, at affordable prices and in sufficient quantities [11]. Energy security is a parameter whose specificity lies in the influence of many factors, so it is not possible to define a unique methodology to determine [12]. Defining a methodological approach for determining the energy security of a country ...
    ... scenarios and rank them individually according to their assessment and a set of predefined criteria. Various methods of multi-criteria analyses have so far been used to assess energy development scenarios: AHP (analytical hierarchy process), MAUT (multi-attribute utility theory), SMART (simple multi ...
    ... that describe energy development, such as security of supply, energy security, competitiveness of the economy, political acceptability, etc., are not so simple to quantify because there is no conventional way of defining, evaluating and measuring them. Fuzzy sets theory has attracted widespread attention ...

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... and mitigation of operating costs for periods of lower demand. High seasonal sensitivity implies that the facility may operate only during the summer, so providing thermal comfort and natural ventilation on warmer days while staying in direct contact with the environment was dominant. Climate in Vojvodina ...
    ... hospitality and medical facilities (Figure 7). However, adjacent medical and hospitality facilities might be planned with program-specific design strategies, so they were not further discussed in detail at this stage of the research. Figure 7. Model for modular wellness facilities with optional ...
    ... of thermal power available for use. Geothermal waters on the Ljuba site, apart from their energy significance, also pos- sess a healing importance, so they can be used for balneological purposes as well. On the basis of their physical–chemical characteristics, these are characterized as natural, hypothermal ...

  • Towards translation of educational resources using GIZA++

    Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević (2016)
    ... of online courses as the majority of such courses are offered in English. Thus a growing need for translating MOOC content. The solutions provided so far have been fragmentary, human-based, and implemented off-line by the majority of course providers. [2] TraMOOC (Translation for Massive Open Online ...
    ... together, processed and presented as a translation unit (TU).  Translation memory (TM) is a database in which CAT tool saves the translation units, so that they can be re- used for later translations. If there are segments that do not match 100 %, the search functions of CAT tools can find them through ...

  • Грешка инклинације код депозиционе реманетне магнетизације

    Mirko Petković, Vesna Cvetkov (2019)
    ... compaction and cementation of sediments lead to the deviation of the inclinations value from one that the sediments acquired during their formation, the so-called inclination error. Sometimes this error is negligible, sometimes it is significant and can cause wrongly defined paleolatitude of deposition ...
    ... this case, the magnetization along one direction can be considered numerically infinite, i.e. the anisotropy of the individual mineral is infinite, so it is only necessary to know the depositional remanent magnetization of the sample to calculate the flattening factor. 1. Uvod Paleomagnetska ...

  • Combining Heterogeneous Lexical Resources

    Cvetana Krstev, Duško Vitas, Ranka Stanković, Ivan Obradović, Gordana Pavlović-Lažetić (2004)
    development of lexical resources, morphological dictionaries, WordNet
    ... themselves, but rather on their mutual relationship. For example, the way elements relate to one another, the way attributes relate to elements, and so on. For instance, the following XPath expression (10) //SYNSET[POS='n' and not(ILR/TYPE='hypernym')] retrieves from a XML document representing wordnet ...
    ... . First of all, the sizes of Serbian MD and Serbian WN are not comparable. The development of Serbian MD has started good many years before WN, so it more thoroughly covers the language. As a consequence, the Serbian MD can benefit less form the WN then vice versa. For that reason, the production ...

  • 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

  • New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)

    Nevenka Đerić, Nataša Gerzina (2014)
    Gornja kreda, radiolarije, Jadar blok, zapadni pojas Vardarske zone, zapadna Srbija
    ... in Stru- ganik village. Thcy are represented by a sequence predomi- nantly made up of thin-bedded limestone, clayey limestonc and maristone (the so-called Struganik Limestone). Chert con- cretions are present throughout the sequence. Based on the identified radiolarian association, the Lower ...
    ... Late Cretaceous terrigenous-carbonate sequence which was con- tinuously deposited until the Campanian, when flysch sedi- mentation began and the so-called Ljig Flysch of Campan- ian-Maastrichtian age was formed. In order to enable more detailed stratigraphic division ofthe Turonian-Senonian ...

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми
    ... separ- ation and the phase boundaries to the two-phase regions determined visually are diverging. Using the ternary mixtures water/toluene/Luten- sol ON 50 as a base case, the role of added sub- stances, sugar surfactant and hydrophilic alcohol ethoxylate on the phase behavior is explored. Effect ...
    ... mol(mc + mo) (4) where the capital indices A, B, C, D refer to the com- ponents, water, oil, surfactant and co-surfactant, res- pectively. The so-called Ž-point, where the three-phase body meets the one-phase region, defines the mini- mum mass fraction of surfactant needed to solubilize water ...

  • Mikroorganizmi - biohidrogeološki indikatori odabranih pojava mineralnih voda Srbije

    Vladimir Šaraba (2021)
    Sa namerom definisanja hidrogeološke uloge i značaja mikrobiološkog diverziteta odabranih pojava mineralnih voda Srbije, primenom sistema biodetektora, dokazano je prisustvo gvožđevitih, sulfato-redukujućih, sluz-produkujućih, heterotrofnih aerobnih i denitrifikacionih bakterija, na osnovu čega je proračunat rizik od razvoja procesa biokorozije i biohemijske inkrustacije, te zdravstveni rizik. Uz procenu rizika, izvedene su analize skenirajuće elektronske mikroskopije biofilmova i hidrogeohemijsko modeliranje, te makroskopska, otpička i difrakciona ispitivanja naslaga inkrustacije, dok je fizičko-hemijskim analizama utvrđena vrednost ukupne mineralizacije iznad 1 g/L, kao i povišeni ...
    biohidrogeologija, SEM analize, makroskopska i optička ispitivanja, rendgenska difrakcija praha, hidrogeohemijsko modeliranje, BART analize, metabarkoding analize mikrobioma, fizičko-hemijske analize, starenje bunara (biokorozija, biohemijska inkrustacija i biozarastanje), zdravstveni rizik
    ... elektrona. Potom nastaje neorganski ugljenik i vodonik-sulfid (Obradović et al., 2012). Takođe, ove bakterije mogu da koriste i azot ili amonijumove soli (Kushkevych, 2019). Sulfato-redukujuće bakterije razvijaju se u sredinama sa redoks potencijalima od -200 mV do +50 mV, pri čemu su dominantni anaerobi ...
    ... proces se naziva plazmoptiza (Jemcev & Đukić, 2000). Međutim, postoje mikroorganizmi koji se uspešno razvijaju u sredinama sa rastvorenim sadržajem soli, odnosno NaCl i drugih minerala. Nazivaju se halofilni mikroorganizmi (Madigan et al., 2010). U okviru kategorije halofilnih mikroorganizama, moguće ...
    ... ekstremnih halofila razvija se u sredinama sa sadržajem NaCl od 32%, mada za neke vrste je karakterističan veoma spor razvoj usled većih koncentracija soli (Madigan et al., 2010). Halofilne arheje Halobacterium salinarum uspešno opstaju u sredinama sa sadržajem NaCl od 15-32%, pri čemu najbolje rastu ...

  • Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian

    Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić (2020)
    The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...
    Part-of-Speech tagging, lemmatization, corpus, evaluation, Serbian, morphological dictionary
    ... sets and for different PoS-tags taggers as well as new tagging technologies will be taken into consideration and tested in order to find the best solu- tion for Serbian, a highly-inflected language without fixed word order, for instance RNNTagger.9 Since CRF tagger for Serbian and Croatian language ...
    ... such as Text Classi- fication, Named Entity Recognition, Sentiment Analysis, Question Answering, etc. Computer programs that perform this task, the so-called ‘taggers’, can be based on lookup-tables, regular expres- sions, linguistic (morphological, semantic and syntactic) rules, machine learning ...
    ... (other) and X (residual) from all tagsets were mapped to X (other). Tag SYM was not used. Sentence delimiters for spaCy were controlled by numbering, so both SENT (end sentence tag) and PUNCT 3957 tags were encoded as PUNCT. In order to perform this complex harmonization task we developed a procedure ...

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... binding capacity of human gastrointestinal fluids. Chem Spec Bioavailability 2004;16:7—104. OCottrell JT, Harris LJ., Tanaka T, Yada RY. The sole lysine residue in porcine pepsin works as a key residue for catalysis and conformational flexibility. J Bio! Chem 1997; 270:10974—190978. [35] ...
    ... incubation milieu causes increase in pepsin activity for 30.7%. Increasing the amount of Al led to a more significant increase of proteolytic activity. So, 3.4-10 M of Al increases pepsin activity for 51.9% (p < 0.01),1.7-:10 +Mfor 72.8%,Wwhile in the presence of 1.7-10 M AI? in incubation milieu ...

  • 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

  • Srbija u OneGeology Europe

    Danka Blagojević, Ranka Stanković, Petar Stejić, Velizar Nikolić (2014)
    Геолошки завод Србије као носилац Пројекта ОneGeologyEurope заједно са Рударско геолошким факултетом и Министарством за природне ресурсе, рударство и просторно планирање су се укључили у међународни Пројекат OneGeology Europe у мају 2013. године у већ поодмаклој фази израде Пројекта. До краја 2013. године испунили су завршене активности које треба да доведу до пуноправног укључења у Пројекат чиме је Република Србија нашла своје место на Геолошкој карти Европе 1:1М. Геолошка карта Србије 1:1М представља компилациону односно поједностављену верзију ОГК 1:500 ...
    OneGeologyEurope, метаподаци, хармонизација података, вишејезични мета-информациони систем
    ... These WFS will allow the user to download data in GeoSciML form, resulting from queries (geographic or other attribute based) of the data over the web, so that the same query could be sent to some/all of the OneGeology contributors WFS services around the world. Serbia's accession to 1G-E involves several ...
    ... participating country, or national data provider, has received a list of terms in English which was translated into the native language of one-to-one, so that the integration of all possible paired terms describes sets of data in all languages of the project participants. Through the activities of earlier ...
    ... These WFS will allow the user to download data in GeoSciML form, resulting from queries (geographic or other attribute based) of the data over the web, so that the same query could be sent to some/all of the OneGeology contributors WFS services around the world. Serbia's accession to 1G-E involves several ...

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... is transported through a hydraulic tunnel. The tailing pond is in the central part of the landfill. Reclamation of the landfill was never undertaken, so when there is windy weather, the effect of dust lifting occurs. There are two channels for drainage of atmospheric waters from the landfill, Energies ...
    ... million cubic meters of tailings lie there. On the northern part of the landfill, tailings from the lead smelter have been disposed for a long time, so the landfill has taken on the form of a cone. Deep cuts have been created as a result of erosion on both sides of the dam, through which comes discharge ...
    ... tailing ponds, despite the very precarious situation. Often, the local population has created facilities and taken part in activities, which are not safe so close to tailing ponds. For example, at about 50 m from some landfills there are wells used for irrigation and water supply, while some fields and streams ...

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... nearest town, approved area or local recipient water can optionally be entered manually. Field values for type of mineral resource are domain controlled, so the user can only select from the list of pre-defined values. The same is true for status, which can be: active, abandoned, unknown, temporary suspension ...
    ... assessments of evaluators. The goal is at the top of the hierarchy, while the criteria, sub-criteria and alternatives are at lower levels. AHP has so far been applied in a variety of areas where decisions are of great importance and where decision makers readily choose a qualified and reliable advisor ...
    ... range of different scientific disciplines, i.e., archaeology. In Serbia there is currently no comprehensive spatial database of archaeological sites; so, the cadastre of abandoned mines could be a good starting point for this. Furthermore, integration (centralization) of all information about archaeological ...

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... the area Wwith reflective surfaces, such as the area covered with snow. However, the SAT does not include reflected radiation in the calculation, so in this case, the total amount of solar radiation is calculated as the sum of direct and diffuse radiation. The SAT calculation involves four steps ...
    ... includes the following: • DEM: • Latitude forthe site area - based on input DEM. The analysis is designed only for local landscape scales, so it is generally acceptable to use one latitude value for the whole DEM. • Sky size - the resolution of the viewshed, sky map, and sun map rasters ...
    ... from the input surface raster. This is the default. — Number of azimuth directions - Valid values must be muhltiples of 8 (8, 16, 24, 32, and so on). The recommended number for complex topography, such as in the case of the topography of the city of Vranje, is 32. 334 12% International ...

  • Microstructural and magnetic properties of electrospun hematite/cuprospinel composites

    Mira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić (2020)
    Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...
    Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic Materials

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... The course material is grouped by instructional weeks (Figure 4), and is made available to students several days before each instruction class, so that the students can get prepared for it. For each of the 15 instructional weeks, a lesson with the content presented in the classroom lecture ...
    ... tool, ontologies can be integrated into repositories of learning objects to organize the different concepts covered by the resources stored in a so called “knowledge domain ontology” [6]. An nice example of the use of Semantic Web services in education is the AquaRing project [7], which used ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)