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Упит dcterms_subject_txt:hydrographic characteristics

411 items

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... quantitative indicators of anisotropy; interval numbers 1 INTRODUCTION Anisotropy is the property of rock sample showing different physical characteristics along different directions. Rock masses anisotropy is especially manifested on their following properties: mechanical resistance, elasticity ...
    ... waves, we have analyzed the properties of isotropic and anisotropic samples. Anisotropy can be expressed quantitatively by comparing certain characteristics such as physical, mechanical or structural along different directions. In our study, we have measured longitudinal elastic waves propagation ...

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... was the only exclusively xylitic lignite, which contained a very low amount of soluble compounds (manifested low Table 1 Lithostratigraphic characteristics of the sampled lignite beds. Symbol Location SEAM Age Lithotype KBR Kolubara Main seam Upper Miocene Xylitic VLN-W1 Velenje Main seam Pliocene ...
    ... by the positive relationship with Eh values (Spearmann 0.46, p< 0.05). This interdependence persists because the electron acceptors Table 2 Characteristics of the investigated coals and lignites. TOC – total organic carbon; N-NO3, N-NH4P-PO4, SD – standard deviation (sample abbreviations as in Table ...
    ... org/10.2343/geochemj.39.397. Kasinski, J.R., Piwocki, M., Swadowska, E., Ziembinska-Tworzydlo, M., 2010. Lignite of the polish Lowlands miocene: characteristics on a base of selected profiles. Biul. Państw. Inst. Geol. 99–154. Kezovic, M., 2011. Coal bearing in Kolubara basin (in Serbian with English abstract) ...

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... ASTM C 618, chemical conditions that classify any fly ash are given in the Tab. 6. Table 6 Classification of fly ash to ASTM C 618 [17] Characteristics Class Natural pozzolan F C N SiO2+Al2O3+Fe2O3 min (%) 70 50 70 SO3 max (%) 5 5 4 Humidity max (%) 3 3 3 Loss on ignition max (%) 6 6 ...
    ... 20g per sample. 2.4 Mechanical properties of fly ash 2.4.1 Compressive strength – uniaxial strength For a general overview of the ash characteristics as a building material and design of the stability and capacity, the parameters, obtained by determining the uniaxial compressive strength and ...
    ... from the thermal PPNT A and the results are shown in Tab. 9. Table 9 The test results of compressive strength and tensile strength Tested characteristics Month of sampling Test results Single Average Average for S1 and S2 Tensile strength / kPa S1 2090 1950 1670 1730 2020 ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... and methods for automatic extraction of candidates for dictionary definitions. The third section provides an analysis of lexical and syntactic characteristics of dictionary definitions in Serbian based on the corpus of definitions of nouns from the five digitized volumes of the SASA dictionary and presents ...
    ... concept under one criterion of subdivision. Intentional definitions are preferable to other types of definitions because they clearly reveal the characteristics of a concept within a concept system: they should be used whenever possible. A lexicographic definition is the identification of the semantic ...
    ... information about the lexeme belonging to a wider lexical-semantic group, and a lower-ranking seme, which carries information about individual characteristics of a lexeme, based on which one lexeme differs from another in the same lexical-semantic group. The basic types of lexicographic definition are ...

  • 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
    ... has more efficient operational power with hybrid data and we get the surface as a final result. This is especially important, because the key characteristics of such a result are the ability to see the center of gravity, dispersion of results and tendency (“time state picture”). Models based on fuzzy ...
    ... environmental and social views. The process of compositing fuzzy relationships was done using a “max–min” model of fuzzy composition. One of the key characteristics of the proposed methodology was its attempt to adopt the group of synthetic indicators that are commonly used in earlier multi-criteria mathematical ...
    ... maximum daily injection quantities 2.6 million m3/day was recorded, and maximum daily withdrawn quantities was 4.99 million m3 [71]. The main characteristics of natural gas infrastructure in Serbia are shown in Table 4. Symmetry 2020, 12, 908 14 of 42                                           ...

  • Keyword-Based Search on Bilingual Digital Libraries

    Ranka Stanković, Cvetana Krstev, Duško Vitas, Nikola Vulović, Olivera Kitanović (2017)
    This paper outlines the main features of Biblisha, a tool that offers various possibilities of enhancing queries submitted to large collections of aligned parallel text residing in bilingual digital library. Biblishsa supports keyword queries as an intuitive way of specifying information needs. The keyword queries initiated, in Serbian or English, can be expanded, both semantically, morphologically and in other language, using different supporting monolingual and bilingual resources. Terminological and lexical resources are of various types, such as wordnets, electronic ...

  • Parametri zbijanja komunalnog otpada određeni različitim laboratorijskim metodama

    Jovana M Janković Pantić, Dragoslav R Rakić, Irena G Basarić Ikodinović, Tina D Đurić, Snežana Bogdanović (2021)
    Zbijanje komunalnog otpada predstavlja jednu od osnovnih faza korišćenja komunalne deponije. Zbog toga je kao i kod drugih nasutih građevina, veoma korisno odrediti parametre zbijanja: maksimalnu suvu zapreminsku težinu (dmax) i optimalnu vlažnost (wopt). Dobijeni rezultati mogu da posluže prilikom projektovanja kapaciteta deponije kao i prilikom definisanja obradivosti otpada. U dosadašnjoj praksi najčešći način određivanja parametra zbijanja je standardna metoda (Proktorov opit) koja se koristi u mehanici tla, uz eventualnu redukciju energije zbijanja. Međutim, različiti tretmani komunalnog otpada na ...
    deponija komunalnog otpada, zbijanje, Proktorov opit, malj sa šiljcima
    ... M., Patil S.: Laboratory imvestigation of сотраспоп characteristics of fresh and degraded municipal solid waste, Wastc Disposal & Sustainable Energy, 2020. Hanson J.L., Yesiller М., Von Stockhausen S.A., Wong W. W.: Сотраспоп Characteristics of Municipal Solid Waste, Journal ог Geotechnical and ...

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

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

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN

  • Značaj izvodjenja Proktorovog opita na komunalnom otpadu

    Jovana Janković, Dragoslav Rakić, Tina Đurić, Irena Basarić Ikodinović, Laslo Čaki (2019)
    Komunalni otpad predstavlja jedan od ključnih problema današnjice. U Srbiji je najčešći vid odlaganja otpada na komunalne deponije i zbog toga je bitno ispravno i sigurno ga skladištiti. Zbijanje komunalnog otpada predstavlja jednu od osnovnih komponenti procesa odlaganja. Kako bi se što bolje predvidelo ponašanje komunalnog otpada neophodno je pre zbijanja na terenu laboratorijski odrediti maksimalnu suvu zapreminsku težinu i optimalnu vlažnost. U dosadašnjoj praksi u svetu za to se koristi standardizovan Proktorov opit. U radu će biti prikazani ...
    komunalni otpad, zbijanje, deponija, Proktorov opit
    ... Landfills, Global Waste Management Symposium, Orlando, Florida. 2014. Hanson, J.L., Yesiller., N., Von Stockhausen, S.A. and Wong, W. W.: Compaction Characteristics of Municipal Solid Waste, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 136, No. 8. 2010. Recycling Tehnologies and Sustainable ...

  • Fluid inclusion systematics in the Okoška gora polymetallic deposit

    Aleš Šoster, Miloš Velojić, Barbara Potočnik Krajnc, Matej Dolenec (2021)
    ... Type assemblagein sphalerite (S1) is characterised by needle-like, eclongated inclusions. Conclusions and final remarks Based on the observed characteristics of the fluid inclusions, some conclusions can be rawn regarding the formation conditions of the Okoška Gora deposit. The fluid inclusions n both ...

  • Hydraulic impact of pressure transients from water conveyance tunnel on the complex hydrogeological system: A case study HPP

    Igor Jemcov, Maja Todorović, Aleksandar Jemcov, Marina Ćuk Đurović (2024)
    Tunel pod pritiskom, Unutrašnji pijezometri, Tranzijenti pritiska, Karstna izdan, Pukotinska izdan, Hidraulički odziv
    ... environments and groundwater, a phenomenon that becomes increasingly pronounced during long-term operation. Section snippets General characteristics of the HPP Pirot system Hydropower plant (HPP) Pirot is situated in the southeastern part of Serbia and utilizes Wwater from the reservoir ...

  • 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
    ... about char- acteristics of specific location is necessary (solar irritation, wind speed, characteristics of river flow, biomass supply chain, etc.), as well as specific information about the technical characteristics of proposed facilities (efficiency, flexibility, mode of operation, etc.). This requires ...
    ... site-specific and that is not taken into consideration. The costs of electricity production from RESs depend on solar insolation, wind speed, characteristics of water flows, or the biomass supply chain. In addition, except for biomass, all RESs are intermittent in character and demand some kind of energy ...
    ... achievable energy generation from RES for the given system performance, topographic, en- vironmental, and land-use constraints (NRE, 2020). Additional characteristics of RES facility operation such as efficiency, flexi- bility, mode of operation, etc., were taken into consideration to some extent when RES potential ...

  • 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 latter alloy group may include additional elements to enhance strength, improve structural properties, and achieve specific technical characteristics. These elements include nickel, chromium, copper, molybdenum, and boron. Steel rods are classified by the American Petroleum Institute (API) ...
    ... include relatively high installation costs and electricity consumption when lifting a relatively high volume of fluid. There are also specific characteristics of electric motor operation in rod pumping, including: — The need to overcome initial inertia when starting the motor — The requirement for ...
    ... foundation of this method is the numerical solution of the wave equation for the sucker rod string. This requires knowledge of the pumping unit characteristics and assumed pump operating. conditions in order to define the boundary condit io ns used to create the solution. There are several sources ...

  • Uticaj geološke neizvesnosti u razvoju rudarskih projekata

    Petar Marković, Dejan Stevanović, Mirjana Banković (2023)
    Rudarstvo je industrija koja se nosi sa različitim vrstama neizvesnosti i rizika zbog svoje prirode i specifičnosti. Neizvesnost u rudarstvu može poticati iz različitih izvora i uticati na različite aspekte rudarskih projekata. Kao jedan od dominantnih faktora, ističe se geološka neizvesnost. Geološka neizvesnost igra ključnu ulogu u rudarstvu i može značajno uticati na procenu resursa i rezervi, planiranje eksploatacije, ekonomsku isplativost i upravljanje rizicima. Ova neizvesnost se ne može eliminisati, ali se uz primenu adekvatnih standarda i zakona može ...
    ... practice from the aspect of categorization of resources and reserves, as well as the influence of the degree of reliability of the geological characteristics of the deposit on the results of the pit optimization, are shown. The analysis was carried out on an iron ore deposit and is based on the assumed ...

  • 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
    ... them using milder agents. It can be concluded that the extracted quantities depend on soil type, nature of extraction agent and metallic ion characteristics. Neodymium, first of all, due to its ionic diameter reacts differently with soil. For that reason the extraction happened only with solutions ...
    ... d more intensive sorption properties, therefore these types of extractions are limited on it, namely this method is not so undemanding. The characteristics (composition) of soil, pH value and extraction solution composition Acce pted M anuscr ipt 10 NIKOLOVSKI et al. are particularly important ...

  • Primena programa UVSZ pri zaštiti od miniranja

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac, Rade Tokalić (2021)
    Primena energije eksploziva tj. miniranje, predstavlja osnovni način eksploatacije čvrstih mineralnih sirovina u rudarstvu. Miniranjem se postižu vrlo povoljni tehnoekonomski pokazatelji, koje nažalost prate i negativni efekti miniranja. U cilju zaštite životne sredine potrebno je za svaku radnu sredinu odrediti jednačinu oscilovanja stenske mase pri miniranju. Ova jednačina definiše promenu brzine oscilovanja stenske mase u zavisnosti od rastojanja, količine eksploziva, uslova izvođenja miniranja i geoloških karakteristika stenske
    Program UVSZ, miniranje, potres, zaštita životne sredine
    ... equation defines the change of rock mass oscillation velocity depending on distance, explosive amount, conditions of blasting and geological characteristics of rock mass. Oscillations of the particles of rock mass at terrain are felt as shock. Based on application of this equation, we are able to ...
    ... This equation defines the change of rock mass oscillation velocity depending on distance, explosive amount, conditions of blasting and geological characteristics of rock mass. Oscillations of the particles of rock mass at terrain are felt as shock. Based on application of this equation, we are able to predict ...

  • Петрологија црвених пешчара источне Србијe

    Андреј Марковић (2024)
    У источној Србији формација црвених пешчара има велико распрострањење и улази у састав многих планина овог дела наше земље. Формацију чине кластичне стене интензивно црвене боје псамитске, ређе псамитско-псефитске структуре и алевритске структуре. Ове стене леже трансгресивно преко старијих пермо-карбонских и карбонских стена, док навише прелазе у доњотријаске седименте. Формација црвених пешчара захвата два појаса унутар Карпато-балканида – унутрашњи и средишњи део. Узорци анализирани у овом раду део су средишњег појаса. Тема завршног рада је петрологија црвених пешчара источне ...
    источна Србија, црвени пешчар, петролошко-минералошке карактеристике, аркозе
    ... of the rocks is distinctly red conditioned by presence of iron minerals. Key words: Kasfern Serbia, red sandstone, petrological-mineralogical characteristics, arkoses. CAJVP)KAJ KA:107 RRRAAAAAA || 1. OIIMITH Z{EO ..........aaaaaaaaaaaaaaaaaaaaaaaaa av eeeeaaaaaaaaaaaaeteć 2 1.1. T eorpadcKH ...
    ... njihovog stvaranja. Savez geoloških društava SFR Jugoslavije, Referati 6 savetovanja, 2, Ohrid, pp. 217-230. – Protić M. (1967): Sedimentological characteristics of the red Permian and the Lower Triassic (Buntstandstein) series in East Serbia. 8. Kongres Karpato-balkanske geološke asocijacije, 2, Beograd ...