Претрага

Упит dcterms_subject_txt:ratio of modified secondary and primary compression index

2950 items

  • 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

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... qualities and are homogenized according to different primary parameters. The number of layers in each pile is selected depending on variability and the value range of the parameter defining the coal quality, while the stacking method depends on the number of layers. STACKING METHODS AND NUMBER OF LAYERS ...
    ... n process is logically directed towards homogenization of heating value, as the primary parameter. At the pits operated by Mibrag (Germany) the leading parameters for coal stockyard homogenization are heating value, at the Profen pit, and iron content at the Schleenhain pit [Ignjatović et al ...
    ... length, width and height of the stacked coal are sized. In these considerations the problem of self-inflaming of coal, availability of space, availability of funding, etc., are not taken into account. Only the technical and technological parameters affecting the size of the pile and stockyard are ...

  • Remedijacija otpadnih voda Rudnika prirodnim zeolitom

    Igor Veličković (2024)
    U radu je razmatrano prečišćavanje otpadnih flotacijskih voda sa područja rudnika Rudnik prirodnim zeolitskim tufom sa planine Jastrebac. Prečišćavanje otpadnih flotacijskih voda sa područja rudnika Rudnik prirodnim zeoliskim tufom sa obronaka planine Jastrebac pokazala se veoma efikasnom. Naime, u tri otpadne flotacijske vode utvrđen je povišen sadržaj arsena, hroma, gvožđa, mangana, kao i nikla. Jednostavnim tretmanom zeolitskim tufom iz ovih voda uklonjeni su svi ovi elementi. Sadržaji gvožđe i mangana su sniženi od 95 do 99 %, dok su ...
    flotation waste water, zeolite tuff, purification
    ... 426-433. Karamata, S., 2006. The geodynamical framework of the Balkan Peninsula: its origin due to the approach, collision and compression of Gondwanian and Eurasian units. In: Robertson, A.H.F., Mountrakis, D. (Eds.), Tectonic Development of the Eastern Mediterranean Region, Geol. Soc. Spec. Publ ...
    ... increased, especially if the zeolite was surface modified. In this final work, preference is given to natural zeolitic tuff, because apart from exploitation, there are no additional costs for separation and/or modification, and the efficiency of removing. toxic elements is quite satisfactory. ...
    ... elevated content of arsenic, chromium, iron, manganese, and nickel was determined. A simple treatment with zeolitic tuff removed all these elements from these waters. The contents of iron and manganese were reduced from 95 to 99 %, while the contents of arsenic, chromium and nickel were reduced ...

  • Sitni, ali bitni: uloga sitnih sisara, herpetofaune i mekušaca u rekonstrukciji pleistocenskih paleosredina

    Katarina Bogićević, Draženko Nenadić, Dragana Đurić, Mihajlo Jovanović, Aleksandra Savković (2023)
    Fosilni ostaci životinja i biljaka imaju važnu ulogu u rekonstrukciji pleistocenskih paleosredina. U ovom radu opisan je značaj tri grupe životinja: sitnih sisara, herpetofaune I mekušaca. Mada je za rekonstrukciju važan sastav čitave asocijacije, nalasci pojedinih vrsta mogu biti dovoljno indikativni da otkriju tip staništa ili klimatske uslove. Posebnu teškoću pri rekonstrukciji paleosredina u Srbiji predstavlja činjenica da klimatske promene na Balkanskom poluostrvu nisu bile tako oštre kao u srednjoj i zapadnoj Evropi, pa ne postoji drastična razlika u ...
    ... addition to the remains of small mammals and herpetofauna, play a significant role in the reconstruction of palaecoenvironments, especially palaeoclimatic conditions. Characteristic species or index-fossils can provide valuable information about the climatic characteristics of an area, since certain ...
    ... Methods of Paleogeographic reconstructions based up on fossil remains of amphibians and reptiles of the Late Cenozoic of the East European platform. Paleontological Journal, 1, 75—80. Ratnikov, V.Yu., (2016): Dynamics of East Europecan modern amphibians and reptiles species distribution areas and thcir ...
    ... based up on fossil remains of amphibians and reptiles of the Late Cenozoic of the East European platform. Paleontological Journal, 1, 75—80. 8. Ratnikov, V.Yu., (2016): Dynamics of East European modern amphibians and rceptiles species distribution areas and thcir potential use in Quaternary st ...

  • 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 ...

  • 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

  • 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 ...

  • 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

  • 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/) ...

  • 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 ...

  • 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 ...

  • 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

  • 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 ...