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Упит dcterms_subject_txt:директно коришћење УПГ-а

1575 items

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... 5 of 16 1 1 1 2 1 n 11 12 1n 1 1 2 2 2 n 21 22 2n n 1 n 2 n n n1 n2 nn w /w w /w ... w /w a a ... a w /w w /w ... w /w a a ... a M= = ... ... ... ... ... ... ... ... w /w w /w ... w /w a a ... a                         (2) The fourth and final step in the AHP method ...
    ... conditions for a partial analysis of each criterion, which are analysed in a very simple way. In that way the method can be adapted to the conditions in a given open-cast coal mine. By making the changes in the weight coefficients of the basic parameters, an analysis of the susceptibility to a desired criterion ...
    ... conditions for a partial analysis of each criterion, which are analysed in a very simple way. In that way the method can be adapted to the conditions in a given open-cast coal mine. By making the changes in the weight coefficients of the basic parameters, an analysis of the susceptibility to a desired criterion ...

  • Using Query Expansion for Cross-Lingual Mathematical Terminology Extraction

    Velislava Stoykova, Ranka Stanković (2018)

  • Процена емисије гасова са ефектом стаклене баште као последице енергетске активности

    Горана Остојић (2024)
    Рад се бави анализом и проценом емисија гасова са ефектом стаклене баште, са посебним акцентом на емисије које настају као последица енергетских активности. Ефекат стаклене баште представља природни процес који је неопходан за одржавање живота на Земљи, али антропогене активности, попут индустријске производње и сагоревања фосилних горива, значајно повећавају концентрацију ових гасова у атмосфери, што доводи до климатских промена. Рад истражује узроке, последице и могућности за смањење емисија гасова, као и развој стратегија за ублажавање негативних ефеката на животну ...
    емисија гасова, ефекат стаклене баште, енергетске активности, климатске промене, мобилно сагоревање, стационарно сагоревање
    ... engaged in mtemational transport(1 A 3 a ı and 1 A 3 d i)should as far as possible be excluded from the totals and subtotals m this category and should be reported separately. 1A3 1A3 1A3 8 |Civil Aviation a Jnternational viation (Inernational Bunkers}) a il Domestic 4viation Emissions ...
    ... anaTuH 3a IIpoHIecHy CMHCHJE ..aaaaaaaaaaaaa a 33 2.4. IIomarHKe H crparerHje 3a cMaPbePbe eMHcCHJe racoBa e(DbeKTa CTaKJIČHC OaITČ a anaaaaaanaaaaaagaaaaaaeaaaaaobavatt 36 3. CTALHOHAPHO CAT OPEBAĐE .........anaaa a 39 3.1. Meronomoruja .....aaaaaaaa a aanaaoaaaiaotiaotataoatttNtt 40 3.1.1. Odnmyke ...
    ... activities m airports and harbours, and off- road activities not oferwise reporied umder | A 4 c Agrculture or | A 2, Manufacturing Industries and Construction. Military transport should bc reported under | A 5 (see | A S Non-specified), 'Combustion related emissons from the operaton of pump stations amd ...

  • Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings

    Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić (2018)
    ... for parameter A, we will take the arithmetic mean value of parameters Ai: A = 1 N · N ∑ i=1 Ai. (36) If the value of parameter A obtained according to Equation (36), is replaced in the Equation (33), we will obtain the value of parameter B. Based on the obtained values of parameters A and B and c ...
    ... Equation (27) becomes: y + 3 = Ax + ST xN − x1 − A(xN + x1) 2 , (37) i.e., equation: logv + 3 = AlogR + ST xN − x1 − A(xN + x1) 2 , (38) where from we obtain: logv = AlogR + ST xN − x1 − A(xN + x1) 2 − 3. (39) If we put that: ST xN − x1 − A(xN + x1) 2 − 3 = logK, (40) Equation (39) maybe ...
    ... 1. Introduction When the seismic wave comes across a certain point in the rock mass, it then disturbs the balance of rock mass particles at that point. The particles oscillate around their balance position for a certain period until they return to a complete standstill. Oscillation of the rock mass particles ...

  • Simple 2D gravity–density inversion for the modeling of the basin basement: example from the Banat area, Serbia

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić (2019)
    We have developed a technique to calculate lateral density distribution of the sedimentary basin basement by combining linear gravity–density inversion and 2D forward modeling. The procedure requires gravity anomaly data, depth-to-basement data and density data for the sediments (density–depth distribution). Gravity efect of density variations in the basement was extracted from the total gravity anomaly by removing the joint efect of the sediments with vertical density variations and homogeneous basement of average density contrast (calculated by 2D modeling). Gravity ...
    funkcije raspodele gustine, lateralna raspodela gustine, karta gustine podloge

  • Tektonska evolucija istočne periferije timočke eruptivne oblasti

    Stefan Zujić (2024)
    U radu su predstavljeni rezultati proučavanja tektonskih i litostratigrafskih karakteristika istočnog oboda Timočke eruptivne zone. Zaključci o geološkim odnosima u okviru Timočke eruptivne oblasti i susednih geotektonskih jedinica izvedeni su na osnovu podataka prikuljenih tokom terenskih istraživanja i podataka dobijenih iz publikovanih radova. Rezultati rada ukazuju da je teren koji je bio tema ovog istraživanja, u strukturno-tektonskom smislu oblikovan tokom glavnih geodinamičkih događaja u okviru Karpato-balkanskog orogenog luka. Analizom strukturnog sklopa su utvrđeni glavni deformacioni događaji koji su predsavljeni ...
    tektonska evolucija, timočka eruptivna oblast

  • A contribution to the understanding of the discharge dynamics and water balance of the karst spring Gornji Dušnik (Suva Planina)

    Aleksandar Tanasković, Vesna Ristić Vakanjac, Dušan Polomčić, Jelena Ratković (2023)
    A sufficiently long time-series of daily discharges is needed to assess the discharge dynamics and calculate the water balance equation parameters of a spring (river source). The paper assumes that a catchment is gauged if a time-series of observations of at least 30 years is available, which is a rare case in Serbia. One-year monitoring is often set up to verify the reserves of a water source or spring intended for capture. Monitoring ceases after the final report is ...
    discharge dynamics, water balance, catchment area, karst spring Gornji Dušnik, Suva Planina

  • Human factor risk management procedures applied in the case of open pit mine

    Snežana Kirin, Aleksandar Sedmak, Wei Li, Miodrag Brzaković, Igor Miljanović, Ana Petrović, Simon Sedmak (2021)
    Risk management aims to provide a controlled work environment to ensure the safe operation of the high-risk systems. It is a dynamic process which work in a continual state of change. The issue of human factor risk and rules and regulations in open pit mine is a main focus of this paper in order to develop predictive models of behavior of workers in relation to compliance with the procedures and rules. Presented survey was conducted in open pit coal ...
    Upravljanje rizikom, ljudski faktor, bager sa kašikom, metod konačnih elemenata

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... Page, J. Chromatogr., A 843 (1999) 369 9. K. Stojanović, A. Šajnović, T. Sabo, A. Golovko, B. Jovančićević, Energ. Fuels 24 (2010) 4357 10. O. Sonibare, H. Alimi, D. Jarvie, O. A. Ehinola, J. Petrol. Sci. Eng. 61 (2008) 99 11. H. I. Petersen, B. Holland, H. P. Nytoft, A. Cho, S. Piasecki, J. de ...
    ... Oils, B. Salih, Ö. Çelikbıçak, Eds., InTech, Rijeka, Croatia, 2012, Ch. 1, p. 3 5. R. A. Bourbonniere, P. A. Meyers, Limnol. Oceanogr. 41 (1996) 352 6. A. Bechtel, R. F. Sachsenhofer, I. Kolcon, R. Gratzer, A. Otto, W. Püttmann, Int. J. Coal Geol. 51 (2002) 31 7. I. R. Kaplan, Y. Galperin, S. Lu ...
    ... sediment top layer (0–20 cm) were collected using a plastic corer and transported to laboratory in polyethylene bags. The sediment samples were wet-sieved through a 63 μm sieve and then air dried at room temperature. The dried samples were gently pounded in a porcelain mortar. Subsequently, the samples ...

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... than grossular-rich opened a question: whether garnet chemistry could be used as a guide in prospecting Cu-skarn deposits (Somarin 2004)? Use of the rare earth elements (REE) in studies of the nature and effects of hydrothermal alterations and hydrothermal sys- tems is a relatively new method as the ...
    ... K., Grubić A., Cvijić R. & Milošević A. 2014: The Upper Cretaceous ophiolite of North Kozara – remnants of an anomalous mid-ocean ridge segment of the Neotethys? Geologica Carpathica 65, 117–130. https://doi.org/10.2478/ geoca-2014-0008 Cvetković V., Šarić K., Pecskay Z. & Gerdes A. 2016: The Rudnik ...
    ... XVI Serbian Geological Congress, Donji Mi­ lanovac, 265–269. Stojanović J., Radosavljević S., Tošović R., Pačevski A., Radosavljević- Mihajlović A., Kašić V. & Vuković N. 2018: A review of the Pb-Zn-Cu-Ag-Bi-W polymetallic ore from the Rudnik orefield, Central Serbia. Annales Geologiques de la ...

  • Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites

    Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)
    To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...
    Perovskite/spinel ceramics, Multiferroic, Sintering, Influence of synthesis method

  • 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
    ... X I I I S k u p p r i v r e d n i k a i n a u n i k a 153 stvarna brzina po istoj formuli. Na datom velosigramu mogu e je direktno o itati stvarnu brzinu oscilovanja (vektor max (ch 1-3)). Uzimanjem u obzir maksimalne brzine oscilovanja rezultati su na strani sigurnosti, jer je maksimalna ...
    ... istoj formuli. Na datom velosigramu moguc¢e je direktno o€itati stvarnu brzinu oscilovanja (vektor max (ch 1-3)). Uzimanjem u obzir maksimalne brzine oscilovanja rezultati su na strani sigurnosti, jer je maksimalna brzina oscilovanja uvek ve¢a od stvarne, a stvarna je ona koja deluje na objekat. 5. ZAKLJUCAK ...
    ... uslova izvo enja miniranja i geoloških karakteristika stenske X I I I S k u p p r i v r e d n i k a i n a u n i k a 147 mase. Oscilovanja estica stenske mase se na terenu ose a kao potres. Na osnovu primene ove jedna ine, u mogu nosti smo da predvidimo brzinu oscilovanja za svako slede ...

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... before combustion is completed. In this process, fuel is gasified to produce a gas mainly composed of carbon monoxide (CO) and hydrogen (H2), which is known as a synthesis gas or syngas. The produced syngas is mixed with steam in a catalytic reactor, which promote reaction between CO and water, producing ...
    ... Danilović, D. The preliminary selection of oil reservoir in Serbia for carbon dioxide injection and storage by a multicriteria decision-making approach: a case study. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 2021, doi: 10.1080/15567036.2021.1936303. 4. Leung, D.Y.C ...
    ... and numerical modeling and simulations – A review. Applied Energy 2016, 161, 225-255, doi: 10.1016/j.apenergy.2015.10.011. 25. Wang, M.; Lawal, A.; Stephenson, P.; Sidders, J.; Ramshaw, C.; & Yeung, H. Post-combustion CO2 Capture with Chemical Absorption: A State-of-the-art Review. Chemical Engineering ...

  • Smanjenje sleganja plitkih temelja primenom mikrošipova

    Slobodan Ćorić, Dragoslav Rakić (2021)
    Mikrošipovi su šipovi malog prečnika koji se grade tako što se u tlu specijalni postupkom formira bušotina koja se zatim armira i injektira. Njihov prečnik je najčešće 150 – 300 mm, a dužina može da bude i više desetina metara. Mikrošipovi mogu da se grade u svim vrstama tla i mogu da budu vertikalni i kosi. Oni se, stoga, koriste kao zamena za konvencionalne šipove i ankere. Primena mikrošipova u fundiranju predstavlja jedan savremeni način izgradnje i sanacije temelja/objekata. ...
    mikrošipovi, sleganje plitkih temelja i mikrošipova, krutost tla i mikrošipova

  • Sepiolite – a by-product of exploitation as a potential raw material in Serbian industry

    Radmila Gaćina, Katarina Urošević, Jelena Zakonović (2019)
    This paper gives a brief overview of the sepiolite deposits, the basic properties, and the possibilities of using this mineral. Particular attention is paid to sepiolites from domestic production, especially the use of sepiolites suitable for the development of small businesses and technologies, with a focus on environmental protection. Aim of this paper is to point out importance of this mineral and to draw attention to the use of domestic raw materials. With appropriate mechanical and chemical pretreatments, sepiolite is ...
    sepiolite, by-product, small-scale mine, marginal costs,

  • Fluid inclusion systematics in the Okoška gora polymetallic deposit

    Aleš Šoster, Miloš Velojić, Barbara Potočnik Krajnc, Matej Dolenec (2021)
    ... 50 um 50 um 50 um Figure 1 — Fluid inchision systematics (a--d). Characteristicfluid inclusion assemblagefor sphalerite 52 (a) and sphalerite SI (b). Primaryfluid inclusion assemblage in quariz (c) and secondary assemblage т диатг (а). 125 Geološki zbornik 26 ...
    ... Eastern Alps, Slovenia. • T. Linnemann, U., Ouzegane, K., Drareni, A., Hofmann 2011: Sands of West Gondwana:an archivi case study from the Cambro-Ordovician sect Sahara) using U-Pb-LA-ICP-MSdetrital zircon Linnemann, U., Gerdes, A., Hofmann, M. & Marko, L. 2 to Early Cambrian crustal growth and orogenic ...
    ... Sigesmund,S., Oriolo, S., Heinrichs, T.. Basei, M. A. S., Nolte, N 2018: Provenance of Austroalpine basement metasedimenits: connections between peri-Gondwanan domainsofcentral Eur International Journal ofEarth Sciences, 107, 2293-2315, | Šoster, А., Хамацик,Ј., O'Sullivan, Р., Непес, U., Potočnik ...

  • Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia

    Maja Milošević, Bojan Kostić (2022)
    ... (CEC) and specific surface area (SSA) measurements. The sample consists mostly of a fraction <1 μm (56.1%) with a 9.5% <2 μm, representing a total clay content (65.5%). Coarse grain fraction (>20 μm) is present in a total of 10.5%. When the clay, silt and sand content were plotted on the triangular ...
    ... corresponds to a high content of montmoril- lonite clay with peaks at 3620 cm–1, 3420 cm–1, 1632 cm–1 and 1018 cm–1. The peaks at 1444 cm–1 and 873 cm–1 correspond to carbonate minerals, although in a very small quantity. X-ray diffraction indicates that the bentonite sample is a mixture of mont ...
    ... K2O, 2.92% FeO, 6.34% CaO and 1.17% MgO, with a lower content of MnO (0.70%), Na2O (0.08%), TiO2 (0.35%) and BaO (0.03%). Higher values of the SiO2/Al2O3 mass ratios (2.97) together with LOI of 16%, CEC (84.5 mmol/100g) and SSA (661.8 m2*g–1) indicate a higher content of montmorillonite. Infrared ...

  • 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

  • Opremanje bušotine X zavojnom pumpom

    Milan Filipović (2024)
    Ovaj rad se bavi osnovnim pojmovima i karakteristikama zavojnih pumpi.Prikazan je sklop zavojnih pumpi i njena prateća oprema. Objašnjen je princip rada zavojnih pumpi kao i uloga svakog mašinskog elementa koji se nalazi u pumpi. Razmotrene su prednosti i nedostaci primene ovih primarnih mehaničkih metoda eksploatacije ugljovodonika. Dat je uvid u inovativna rešenja problematike primene zavojnih pumpi. Na konkretnom primeru bušotine X su prikazani problemi kao i rešenja primene ovih primarnih mehaničkih metoda u praksi. Napravljena je detaljna analiza ...
    zavojne pumpe, oprema, primarne mehaničke metode, ugljovodonici, analiza rada
    ... Motor Power: 22 kW Motor Line Current in amps: 38.9 A Motor Phase Current in amps: 22.46 A Starter Type: Star/Delta Circuit Breaker Selection: 40 A Main Contactor Size: 38 A Delta Contactor Size: 38 A Star Contactor Size: 25 A Overload Relay Size: 18to 25 Amps Required Cable Size: ...
    ... aa a aeadaaaaaeanaanaaaaeaaaeoaieaaagavee 8 2.4 Opremanje bušotine.....aaa a aaanaaaaaaaaaoaaaaoaaaaaoaaaao ı 10 2.5 Prednosti i nedostaci.........aa a aaaaaaaaaoaaaaaoaatatı 15 3. PROJEKTOVANJE PROFILA BUŠOTINE X...aaaaaaaaaaaaaddaan n aaddanonnnndtinı 16 3.1 Opšti podaci o bušotini X a aaa ...
    ... zavojne pumpe, oprema, primarne mehaničke metode, ugljovodonici, analiza rada SADRŽAJ l. UVOD......n a anaanaaaaaoaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaoaagagakaovttet || 2. _ ZAVOJNE PUMPE.........a a aeaaapaaaaaaaaaaaaaaeaatat t 2 2.1 |Eice) vi }: uAAA AAAOAAA OAAAA ARAAAAARARARARRARRARRRRRRRRRRRRRRRREI" ...

  • Управљање радом центрифугалних компресора

    Младен Благојевић (2024)
    Овај мастер рад се бави анализом и управљањем рада центрифугалних компресора у индустријским постројењима, са посебним освртом на управљачке системе који осигуравају њихов ефикасан рад. Рад обухвата разматрање различитих система за регулацију протока, притиска и примену савремених метода регулације као што су повратна и напредна. Такође, анализиране су динамичке промене у раду компресора, утицај поремећајних величина и могућности оптимизације. Резултати су показали да правилна примена управљачких система не само да спречава пумпање, већ и повећава стабилност и продуктивност целокупног ...
    центрифугални компресори, управљање компресорима, проток притисак, повратна регулација, напредна регулација, оптимизација
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