Претрага

Упит dcterms_subject_txt:ratio of modified secondary and primary compression index

2944 items

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • Energetska bezbednost sektora prirodnog gasa Srbije

    Aleksandar Madžarević, Predrag Jovančić, Miroslav Crnogorac (2023)
    U prve dve decenije 21. veka obezbeđivanje sigurnosti snabdevanja prirodnim gasom domaćeg tržišta bio je jedan od prioriteta razvoja energetike Srbije. Istovremeno, aspekt sigurnog snabdevanja bio je neizostavni deo slagalice stvaranja energetske bezbednosti. Izražena uvozna zavisnost je dominantna karakteristika sektora prirodnog gasa, tačnije, Republika Srbija je snažno zavisna od ruskog gasa, sa više od 80% uvezenih količina gasa, a do pre dve godine snabdevala se isključivo kroz jednu interkonekciju. U radu se razmatra aktuelna situacija u sektoru prirodnog ...
    N-1, IDUPS, energetska bezbednost, sigurnost snabdevanja
    ... analysis of the energy security of the natural gas sector assessed by the N-1 index, IDUPS and the parameter of infrastructure development of the sector was carried out. These three parameters describe the availability of the system in a technical sense, the diversification of sources and directions ...
    ... professor at the Faculty of Mining and Geology, University of Belgrade. He graduated, completed his master's studies, and received his doctorate in the scientific field of oil mining, mechanization, and automation in mining, at the Faculty of Mining and Geology, University of Belgrade, where he was ...
    ... directions of supply, as well as the degree of structural development, compared to the foreseen strategic development plans, respectively. This paper also presents a new methodology for determining the impact of system readiness and the number of sources and directions of supply, as well as their ...

  • Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System)

    Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević, Ksenija Stojanović (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined. The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently ...
    ... initial bitumen of both raw samples, the pristane/phytane (Pr/Ph) ratio is similar (< 0.4). In LPs from the OS the values of Pr/Ph are 1.23 and 1.74. That might be explained by a preferred release of pristane than phytane from isoprenoid moieties during slight thermal treatment of kerogen (Larter ...
    ... (Larter et al., 1979). In LPs from the CS, the Pr/Ph ratio is ~1, that might be caused by the increase of maturity (Peters et al., 2005 and references therein). In initial bitumen, the n-alkan-2-ones are identified in the range of C12–C33. In LPs from the OS, they are present in the range C10–C33, whereas ...
    ... Serbia. The selected samples showed high content of total organic carbon (TOC > 13 wt. %), high hydrocarbon generation potential (Hydrogen Index, HI > 615 mg hydrocarbons/g TOC), but also certain variations in sources and depositional environment of organic matter (sample D13 - type I kerogen, deposited ...

  • Метода променљивих околина за решавање проблема p-центра са поузданом мрежом

    Јована Рађеновић, Стефан Мишковић, Оливера Станчић (2023)
    У овом раду је разматран проблем p-центра са поузданом мрежом (енгл. Reliable p-center facility location problem - RpCFLP). Решавање проблема подразумева иницијално успостављање p ресурса и алокације корисника, као и накнадну реалокацију корисника у складу са новонасталим сценаријима који садрже информације о онеспособљеним ресурсима и осталим измењеним улазним подацима. За решавање посматраног проблема предложена је метахеуристика заснована на итеративној варијанти основне методе променљивих околина (енгл. Iterated basic variable neighborhood search - IBVNS). Резултати тестирања предложене метахеуристике указују на њену ...
    Проблем p-центра, Робусна оптимизација, Метода променљивих околина

  • Using gravity data to define structural correlation affecting the formation of Neogene basins

    Snežana Ignjatović, Ivana Vasiljević, Branisav Sretković, Milanka Negovanović (2023)
    A gravity survey can help to define the structural correlation in the study area. The structures that have influenced the development of Neogene basins can be defined using gravity data. By applying mathematical transformations to gravity data, the geological structures (faults, nappes, etc.) that impacted the formation of Neogene basins can be defined. We have taken the part of the Dinarides as the test region. The paper presents the results obtained using the procedure residual, vertical gradient, and total ...
    gravity survey, mathematical transformation, basin

  • A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area

    Filip Anđelković, Dejan Radivojević (2018)
    baden, Beograd, facije, facijalna raznovrsnost, sedimenti
    ... ečnjak  Figure 1. Palaeogeographical map of Badenian sediments of Belgrade (Stevanović, 1974, modified). Key: 1‐ land south of Sava  and Danube,  2‐  shallow  sea, Rakovica  sands,  3‐ Višnjica  clays,  4‐ Konjarnik  schlier,  5‐  Lithothamnium‐bryozoan  and Amphi‐ stegina limestone, 6‐ Cerithium limestone  ...
    ... EDGE OF FACIAL DIVERSITY OF  BADENIAN SEDIMENTS IN THE BELGRADE AREA    Filip Anđelković1, Dejan Radivojević2    1) University of Belgrade, Faculty of Mining and Geology, master student, e‐mail: filip.andjelkovic@rgf.rs  2) University of Belgrade, Faculty of Mining and Geology, Department of Regi ...
    ... southern  rim of  the Pannonian basin  (Marović et al., 2007). The study of Badenian sediments was carried out  in great detail during  the XX  century, belongig to the following projects: Basic geological map of Yugoslavia, Geology of Serbia (Pet‐ ković, 1977) and Geology of the Belgrade and its surrou ...

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • A Tool for Enhanced Search of Multilingual Digital Libraries of E-journals

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Aleksandra Trtovac, Miloš Utvić (2012)
    This paper outlines the main features of Bibliša, a tool that offers various possibilities of enhancing queries submitted to large collections of TMX documents generated from aligned parallel articles residing in multilingual digital libraries of e-journals. The queries initiated by a simple or multiword keyword, in Serbian or English, can be expanded by Bibliša, both semantically and morphologically, using different supporting monolingual and multilingual resources, such as wordnets and electronic dictionaries. The tool operates within a complex system composed ...
    multilingual digital libraries, query expansion, TMX
    ... the scope of the BalkaNet project [Tufiş, 2004] and subsequently enhanced and upgraded. Most of the synstes in Serbian Wordnet are aligned with PWN synsets via the Interlingual Index, with the exception of Serbian specific synsets that are not available in PWN. The Interlingual Index enables bilingual ...
    ... Serbian and English version of journal articles were manually preprocessed and then automatically aligned, and the alignments manually corrected using ACIDE. Table 1 shows the total, minimum, maximum and average length of articles (in words and sentences), given separately for Serbian and English ...
    ... rs/), which covers the field of Library and Information Sciences, is one of the few journals that publish all articles both in Serbian and in English, and was thus an almost perfect resource for testing our tool. The interest in collections of aligned texts and tools tailored for their search ...

  • 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 ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... 51/603­53/603), made of a mixture of matrix and xylite­rich coal, has variable amounts of Si and Al, with high contents of Ca, Fe and Mn in samples 45/601 and 52/603, followed by a higher Si/Al ratio. The lignite from the Ib layer is characterised by moderate to high ash and sulphur con­ tents, while the ...
    ... upper (Ia) layer is characterised by moderate ash and sulphur contents and variable amounts of Ca and Fe with a higher Si/Al ratio, which is compatible with a higher contribution of siliciclastic sediments. The characteristics of lignite in seam I of the B field (samples 26/91­31/91) revealed that ...
    ... estimated at 1000 m. The Neogene units of the Kovin deposit Figure 1. Location of the Kovin deposit (a, b) and simplified geological map (c) of the Kovin deposit with sample locations (modified after Basic Geologic Map of Ser- bia, section L34-127 and L34-115; http://geoliss.mre.gov.rs/OGK/RasterSrbija/) ...

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit

    Suzana Lutovac, Nebojša Vidanović, Čedomir Beljić, Zoran Gligorić (2015)
    ... radius of charge and the distance from the blast site to the monitoring point increase in the same or approximately the same ratio, the soil oscillation velocity remains the same [1], i. e. that is : n o v r r Kv , (2) The radius of the explosive charge r0 and the amount of explosive ...
    ... was also taken into ac- count the curveline dependency index ρ [4] between the reduced distance R and the oscillation velocity v. The evaluation of the relationship de- gree of two variables 8 to values of the curveline dependency index ρ is given in the following survey: 0.0 < ρ < 0.2 - none ...
    ... Poisson's ratio μdin = 0.39 [GN/m2] 4.2 Blasting Method Measurements of seismic shocks at the ”Kovilovača” open pit were performed dur- ing blasting, conducted for the purpose of deposit exploitation [9]. Two blasting opera- tions were performed. Balkanit 60/1500, detonex 65/1500 and ANFO 70/1500 ...

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • Low-temperature phase transition and magnetic properties of K3YbSi2O7

    Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica
    ... p.a.) in the molar ratio of 1:12 and KF flux (2 g; Centrohem, 99%). After homogenization in an agate mortar, the material was transferred to a platinum crucible, covered with a lid and then placed in a furnace with resistance wire heating elements. Starting from room temperature the sample was heated ...
    ... ) in the molar ratio of 1:12 and KF flux (2 g; Centrohem, 99%). After homogenization in an agate mortar, the material was transferred to a platinum crucible, covered with a lid and then placed in a furnace with resistance wire heating elements. Starting from room temperature the sample was heated to ...
    ... Serbia, eFaculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova cesta 2, Ljubljana, 1000, Slovenia, fInstitute of Mathematics, Physics and Mechanics, Jadranska 19, Ljubljana, 1000, Slovenia, and gStructure Analysis, Institute of Physics, Academy of Sciences of the Czech Republic ...

  • Izdvajanje vode iz prirodnog gasa

    Dejan Nedeljkov (2024)
    U radu je istaknuto važnost prirodnog gasa kao vitalna komponenta svetske energetike.Spada u najsigurnije,najčistije i najkorisnije fosilno gorivo. Sama pojava vode u vidu vlage u gasu je pokazatelj lošeg kvaliteta gasa. parametri koji mogu dovesti do lošeg kvaliteta prirodnog gasa kao pokazatelj je Wobbe index.U okviru istraživanja u master radu glavni problem funkcionisanja na KPG Paliću predstavlja vlaga u gasu,takođe se može zaključiti da kvalitet gasa zavisi od Wobbe indeksa odnosno, što je Wobbe veći, čistiji je gas, ili ...
    prirodni gas, separatori, separacija, grejači, čileri, tačka rose, Wobbe indeks
    ... i dobar Wobbe index a samim tim i bolji kvalitet gasa. Sve dok se ovo ne ugradi KPG Palić ne može da ostvari standarde koje očekuje od njih firma kojoj se isporučuje gas. 49 LITERATURA [1] Arnold, K., Stewart M.,Surface Production Operations, Design of Gas Handling Systems and Facilities Burlington ...
    ... запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available ...
    ... Burlington Elsevier, 1999.godine [2]American Petroleum Institute, Specification for Oil and Gas Separators, API Publications and Distribution, Washington DC, 1999. godine [3] Bodor, J., Szabo J., Strength calculation of pressurized structures, Muszaki Konyvktiado, Hungarian, Budapest, 1982. godine ...

  • Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin

    Dušan Polomčić, Bojan Hajdin, Marina Ćuk, Petar Papić, Zoran Stevanović (2014)
    menadžment podzemnih voda, monitoring, kvalitet podzemnih voda, bilans, baza podataka

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... agent instead of air, the optimal ratio should be about 7-8 kg of steam per m? of O». If only oxygen is used, the calorific value ofthe gas from such UCG process would be 2-2.5 times higher than that of air gasification [2]. Analyzing UCG process as a way of obtaining a suitable and useful energy ...
    ... structures of the coal bed, as well as coal roof and coal fioor. Coal gasification chemistry includes Gasification cavity shape seven primary reactions occurring within the with CRIP layer. The primary reaction that happens is the displacement reaction of the generated water vapor (H.O) and gas, ...
    ... coal layers using injection of oxidants and steam. The product gas is transferred to surface through wells drilled from the surface, fig. 1. World experiences in UCG indicate that the primary form of coal energy should be treated much more rationally. The effects of the UCG application have resulted ...

  • Production information system of the Pljevlja coal mine

    Božo Kolonja, Ranka Stanković, Filip Vuković (2018)

  • Development of a petrographic classification system for organic particles affected by self-heating in coal waste. (An ICCP Classification System, Self-heating Working Group – Commission III)

    M. Misz-Kennan, J. Kus, D. Flores, C. Avila, Z. Büçkün, N. Choudhury, K. Christanis, J.P. Joubert, S. Kalaitzidis, A.I. Karayigit, M. Malecha, M. Marques, P. Martizzi, J.M.K. O'Keefe, W. Pickel, G. Predeanu, S. Pusz, J. Ribeiro, S. Rodrigues, A.K. Singh, I. Suárez-Ruiz, I. Sýkorová, N.J. Wagner, D. Životić (2020)
    Self-heating of coal waste is a major problem in the leading coal-producing and consuming countries, independent of the recent or past coal exploitation history. The phenomenon of self-heating is dependent on many factors such as the properties of organic matter (maceral composition and rank), moisture and pyrite content, climate effects, and storage conditions (shape of the dump or compaction of the coal waste). Once deposited, coal waste undergoes oxidation, which can lead to self- heating with the overall temperatures ...
    Stratigraphy,Economic Geology,Geology,Fuel Technology

  • Analiza obrazovnog sistema i kadrovskog potencijala Republike Srbije u oblasti rudarstva i geologije

    Dragan Ignjatović, Stevan Đenadić, Predrag Jovančić, Filip Miletić, Jovana Mitrović (2024)
    Adekvatno postavljen i kontinualno unapređivan sistem obrazovanja predstavlja jasan preduslov za razvoj pojedinca, društva i države u celini. Sistem obrazovanja u Republici Srbiji davno je postavljen, a reforme nisu do kraja sprovedene. Posebno je to izraženo u visokom obrazovanju gde reforma po bolonjskom sistemu nije do kraja sprovedena ili je negativno zloupotrebljena. Trenutno je sistem obrazovanja je pod velikim pritiskom usled oštrih zahteva tržišta rada. U ovom radu je izvršena analiza obrazovnog sistema u oblasti rudarstva i geologije u ...
    obrazovanje, rudarstvo, geologija
    ... in addition to knowledge in mining and geology, often need to possess skills in organization and management as Wwell as decision-making abilities. The paper provides an overview of the current situation in secondary and higher education in the fields of mining and geology. Furthermore, it outlines ...
    ... education system is under significant pressure due to the sharp demands of the labor market. This paper analyzes the education system in the field of mining and geology in the Republic of Serbia. Given that mining and mineral resources are of vital importance to society, active participation from experts in ...
    ... OBRAZOVNOG SISTEMA I KADROVSKOG POTENCIJALA REPUBLIKE SRBIJE U OBLASTI RUDARSTVA I GEOLOGIJE ANALYSIS OF THE EDUCATION SYSTEM AND PERSONNEL POTENTIAL IN THE FIELD OF MINING AND GEOLOGY IN THE REPUBLIC OF SERBIA Ignjatović D.!, Đenadić S-?, Jovančić P.*, Miletić F.“, Mitrović J.5 Apstrakt Adekvatno ...