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518 items

  • 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 ...

  • 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 ...

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • 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

  • Uticaj raspadanja na stabilnost kosina u mekoj stenskoj masi

    Anđela Despotov (2024)
    U radu je opisano ponašanje mekih stenskih masa koje su izložene porecesu raspadanja tokom određenog vremenskog perioda. Meke stenske predstavljaju kritične vrste stenskih masa pošto izazivaju različite probleme tokom izvođenja građevinskih radova. Meke stene mogu biti sedimentne stene, raspadnute metamorfne i magmatske stene. Odlikuju se niskim vrednostima čvrstoće, visokom deformabilnošću, visokom plastičnošću, podložne su dezintegraciji i fizičko-hemijskom raspadanju, odnosno ubrzanom dejstvu površinskog raspadanja usled atmosferskih uticaja.Za klasifikaciju mekih stenskih masa koriste se modifikovane verzije već postojećih klasifikacionih sistema. Jedan ...
    meke stenske mase, dezintegracija, klasifikacioni sistemi, Slake durability test
    ... izražena temperaturna kolebanja. Usled taloženja soli u pukotinama stena dolazi do kristalizacije minerala i povećanja pritiska odnosno dodatnih napona. Samim tim dolazi do dezintegracije stenske mase, a njen intenzitet zavisi i od tipa stena i od tipa soli. Oblasti u kojima se Javlja označene su visokom ...
    ... stenskih masa, Kanji (2014) Osnovni Tip Podgrupa Sedimentne stene Klastične: škriljci, alcvrit, peščari, konglomerati, breče i lapor; Evaporati: so, karnalit; Rastvorljive: krečnjak, dolomit i gips; Ugalj Magmatske stene Vulkanski konglomerati, breče, bazaltne breče; piroklastične naslage ...
    ... će doći usled temperaturnih promena, vlaženja i sušenja, zamrzavanja i odmrzavanja, pritisaka vode i leda u porama i diskontinuitetima, taloženja soli u pukotinama stena, bubrenja i skupljana materijala zbog apsorpcije vode i rasta korenja biljaka. U slučaju temperaturnih promena postoje dnevne ...

  • 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
    ... podzemne vode obogaćene kalijumom. Prilikom isparavanja tih voda moguće je taloženje soli kalijuma. U slučaju slanih jezera i rasola, koji su u vezi sa ležištima soli kalijuma, takođe može doći do nakupljanja soli kalijuma, kao posledica isparavanja (Перельман 1972). U uslovima oksidacije sulfidnih ...
    ... voda nije zasićena ovim mineralom. U morskoj sredini, fluor se taloži u naslagama soli, evaporatima, pri čemu često ulazi u kristalnu strukturu natrijum-hlorida. Selait (MgF2) se javlja u sočivima kalijumovih soli (Rankama and Sahama 1950). Samo mali deo fluora transportovanog do mora zapravo ...
    ... obrazovanja. Ispitivanje određenih mikroelemenata u podzemnim vodama značajno je i prilikom istraživanja ležišta mineralnih sirovina (nafte, gasa, soli i raznih metaličnih i nemetaličnih sirovina). Predmet ove doktorske disertacije su upravo mikroelementi u mineralnim vodama, uslovi i oblici ...

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... information objects. Thesauruses are above taxonomies in the se- mantic spectrum. They can be defined as vocab- ularies structured in such a way so as to display equivalence, homography, hierarchy and associa- tion relations among terms in a clear manner and allow their easy recognition through ...
    ... data are taken: geologic, administrative, numerical (in which case there is an allowed range of values), which geologic discipline it belongs to and so on. The role of the class DomainNode is to determine which terms are incorporated into a domain. This is the class where an individual node and the ...
    ... cessing method and comments is provided for every individual term entry. A correction of a dictionary entry can be made only by the user who created it, so that the entry authorship re- quirement is met. Figure 6. Term entry interface The application offers possibilities of a tabu- lar view of subordinate ...

  • 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 ...

  • 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)

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Fluid inclusion systematics in the Okoška gora polymetallic deposit

    Aleš Šoster, Miloš Velojić, Barbara Potočnik Krajnc, Matej Dolenec (2021)
    ... Delpinovž 5000 Nova Gorica; martina.stupar(zpsvn.si Varstvo geološke dediščine, njeno prepoznavanje in raziskovanje [ет ог javnosti o pomenu geologije so bili od samega začetka cilji Evropske zveze 22 0 geološke dediščine ProGEO. ProGEO je nevladna organizacija katere člani 0 inštitucije, društva, o ...

  • Multihazard Exposure Assessment on the Valjevo City Road Network

    Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović (2019)
    Prirodni hazardi, izloženost, klizišta, poplave, bujice, GIS, R

  • Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...
    Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatori

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... the natural energy of the reservoir, this method of exploitation is called an eruptive method. When the reservoir energy is sufficiently depleted, so that the reservoir pressure is no longer enough to enable the flow of fluid through the well, pipeline, and surface equipment, when production has ...
    ... cylinder is connected to the tubing and installed in the well as an integrated part. The cylinder of an insert pump is a component ofthe pump itself, so insert pumps are installed or removed from the well completely (cylinder with piston) independently of the tubing string, allowing for partial r ...
    ... solutions, makes this type of pump adaptable to different exploitation conditions. Compared to tubing pumps, the piston and cylinder are smaller in size, so the capacity of insert pumps is lower than that oftubing pumps. |[5] 17 The operation of the pump is achieved through the movement of the piston ...