Претрага

Упит dcterms_subject_txt:Hierarchical cluster analysis

754 items

  • Primary crusher site selection in open pit mines - case study in Sungun copper mine

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Mehdi Rahmanpou (2021)
    Facility site selection, (such as Primary or in pit Crusher location) is one of the most important steps in mine de-sign process that has a significant impact on economy of the mining operation. This study covers an attempt to find the optimal location forprimary crusher in order to support the expansion of Sungun copper mine, which is the second largest open pit mine in Iran. Recent exploration drilling has led to a considerable increase in the ore reserve. Therefore, ...
    odabir lokacije, višekriterijumsko odlučivanje, analiza osetljivosti, Sungun rudnik bakra

  • Hidrohemijske karakteristike termomineralnih voda Mataruške Banje

    Snežana Kretić, Jana Štrbački (2022)
    Mataruška Banja je naseljeno mesto u Centralnoj Srbiji, koje teritorijalno pripada opštini Kraljevo. Banja je poznata po prirodnim lekovitim vodama visokih temperatura. Formiranje termomineralnih voda vezuje se za rasprostranjenje magmatskih stena. Cilj rada je definisanje hidrohemijskog sastava ovih voda i razmatran je kroz rezultate osam kompletnih hemijskih analiza i jedne skraćene hemijske analize, uzete sa bunara MB-2/81. Hidrogeološka istraživanja, uzorkovanje i izrada kompletnih hemijskih analiza izvršeni su u periodu od 1981. do 2004. godine, dok je uzorkovanje i izrada ...
    Mataruška Banja, termomineralne vode, kvalitet podzemnih voda, vodonik-sulfid, metasilicijumska kiselina

  • Negative Impact of Backwater Levels of Danube River and its Tributaries to the Groundwater Regime in Meliorated Riverside Areas

    Predrag Pajić, Uroš Urošević, Dušan Polomčić, Milan Dimkić (2016)
    This paper describes updated calculation methodology of Danube backwater impact, occurred as a consequence of “Đerdap I” hydropower plant operation, onto the meliorated riverside areas. This methodology is based on hydrodynamic analysis of groundwater regime (size, duration, level and inflow changes) and quantification of melioration areas impairment which is caused by “Đerdap I” hydropower plant operation. By comparing the groundwater regime elements, obtained by variant hydrodynamic calculation in mathematical models for natural – not backed up and actual – ...
    HPP ''Djerdap 1'', backwater influence, groundwater regime, hydrodynamic analysis, melioration area, drainage system, additional energy engagement

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... large number of conditioning fac- tors in a particular analysis is not a guarantee for successful susceptibility modelling. Factor selection will always be subjec- tive, so the assessment of regional factors by the expert conduct- ing the analysis is of crucial importance. Statistical methods, which ...
    ... and sensitivity coefficients. It can be ar- gued that this approach translates the susceptibility analysis into a trial and error exercise, making it highly subjective. However, with careful analysis of all the available data, weightings can be reasonably well selected, which will ultimately lead ...
    ... for other available regional susceptibility zonation meth- ods), the spatial precision should be confirmed by repeating the analysis over a period of 5 – 10 years. Such analysis should be performed using an updated landslide inventory map and, if available, refreshed datasets of the temporally dependent ...

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... Information sciences, 8, 199—249. Š| CHANG D. Y. (1996) Applications of the extent analysis method on fuzzy AHP, Rur. J. Oper. Res., 95, 649 655. “} ZnU K., Y. JING, D. CHANG (1999) A discussion on extent analysis method and applications of fuzzy AHP, Eur. J. Oper. Res., 116, 450 456. TOLGA FE ...
    ... relaying: knowledge and expressing; opinions, the paper tests a fuzzy optimization methodology that uses linguistic variables. Consequently, extent analysis is applied to fuzzy AHP by means of triangular fuzzy numbers to arrive at a decision about the optimal mining; technology. The entire proce- dure ...
    ... all the criteria relative to alternative solutions plays a major role in optimal decision making. The solutions are optimized by fuzzy extent analysis, applying the FAHP method described in |*|. The optimization procedure and decision making; are presented in seven steps [12]. Step 1. Mathematical ...

  • Long-term planning methodology for improving wood biomass utilization

    Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković (2019)
    The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...
    Long-term planning methodology, Forest biomass, MINLP, Backcasting

  • Multi-elemental analysis of real water samples from the Požega area, Serbia

    Nebojša Pantelić, Jana Štrbački, Ivana Maloparac, Nikola Tomašević, Biljana Dojčinović, Aleksandar Kostić (2022)
    Cilj ovog rada bio je ispitivanje kvaliteta realnih uzoraka vode za piće, prikupljenih sa teritorije grada Požege i okolnih seoskih naselja. Za određivanje koncentracije makro i mikroelemenata u uzorcima vode korišćena je analitička tehnika induktivno kuplovana plazma sa optičkom emisionom spektrometrijom, ICP-OES. Dobijeni rezultati upoređivani su sa maksimalno dozvoljenim kocentracijama elemenata propisanim nacionalnim Pravilnikom o higijenskoj ispravnosti vode za piće, kao i preporukama Svetske zdravstvene organizacije (WHO) i Američke agencije za zaštitu životne sredine (EPA). Analizirane vode su malomineralizovane ...
    General Materials Science

  • Crystallographic, spectroscopic, thermal and computational studies of polymeric cobalt(II)–mellitate complex with 2,2′-bipyridine

    Lidija Radovanović, Dušan P. Malenov, Marko V. Rodić, Aleksandar Kremenović, Jelena Rogan (2021)
    Orange single crystals of new polymeric cobalt(II) complex {[Co(bipy)(H2O)4]2[Co(μ-mell)(H2O)2]·10H2O}n, 1, were synthesized by slow evaporation method at room temperature (bipy = 2,2′-bipyridine, mell = hexaanion of mellitic acid) and its crystal structure was determined by single-crystal X-ray diffraction. The complex 1 was characterized based on elemental analysis, FTIR spectroscopy and thermal (TG/DTA) analysis followed by computational analysis of noncovalent interactions and quantum chemical calculations of interaction energies. In 1, two crystallographically different Co(II) atoms adopt a deformed octahedral geometry, ...
    Inorganic Chemistry, Organic Chemistry, Spectroscopy, Analytical Chemistry

  • 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

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... recrystallization, which removed most of the slightly soluble impurities, which contain Si, Fe, Al, Ti, etc., fo-m phosphogypsum. XRD analysis The XRD analysis showed that the most abundant phases in the PGI and PG2 samples are gypsum (CaSOu:2H5O), brushite (CaHPOu:2H>SO) and quartz (Fig. 3). ...
    ... of phosphate rock digestion with H,SO,. (Ca(H.)POu), has 100 times greater solubility than the less acidic CaHPOu·2H»O form.) SEM analysis The SEM analysis revealed a significant increase in the gypsum crystal size after the recrystallization (Fig. 5). Moreover, the z/x axis ratio increased ...
    ... was 90.50%, with 4.29% of insoluble residue (PGIR) and 5.21% of the original mass in the supernatant. Sample PGIP was also subjected to chemical analysis, phase and morphological characterization and activity concentration determination, while sample PGIR was subjected only to chem- ical charac ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... database consisted of a thorough analysis of formatting conventions that were used for typesetting dictionary entries, as well as identification of triggers (such as special words, abbreviations or punctuation marks) used to introduce specific information. This analysis enabled the recognition of the ...
    ... _or_email). Features that were not taken into consideration in this analysis were mostly dependent on the headword, e.g. its position in the example. They were classified as headword dependent and will be part of future analysis. 3.3 API for feature extraction The extraction of features is implemented ...
    ... model for selection of good dictionary examples for Serbian and the development of initial model components. The method used is based on a thorough analysis of various lexical and syntactic features in a corpus compiled of examples from the five digitized volumes of the Serbian Academy of Sciences and ...

  • Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2023)
    ... 2023-10-18 07:20:34 Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Analysis of a simplified ...
    ... s. - The Repository is available at: www.dr.rgf.bg.ac.rs 9 International Conference MINING AND ENVIRONMENTAL PROTECTION May 2023, Serbia ANALYSIS OF A SIMPLIFIKD MODEL FOR DETERMINING ROCK MASS OSCILLATION VELOCITY AT THE KOVILOVAČA OPEN PIT Suzana Lutovac, Miloš Gligorić, Jelena Majstorović ...
    ... environment from shock when performing blasting it is necessary to define rock mass oscillation equation for each working site. This paper ofjers the analysis of the simplified model for defining parameters of the oscillation equation at the Kovilovača open pit, in eastern Serbia. On the basis of calculation ...

  • Komparativna analiza završnih kontura površinskog kopa Drmno

    Dejan Stevanović, Dragan Ignjatović, Tomislav Šubaranović, Mirjana Banković, Petar Marković (2022)
    Definisanje optimalne završne konture površinskog kopa od suštinskog je značaja za ostvarivanje strateških ciljeva u razvoju rudarskih projekata. Savremeni programski paketi i metode za optimizaciju granica kopa, zasnivaju se na pronalasku završne konture koja obezbeđuje maksimalan profit. U slučaju površinskih kopova uglja, kod kojih osim profita postoji i čitav niz dodatnih kriterijuma i strateških ciljeva, princip optimizacije granica prema profitu, najčešće nije u potpunosti primenjiv. Iz rog razloga za uspešno definisanje granica površinskih kopova, neophodno je sagledati čitavu lepezu ...
    završna kontura, ugalj, komparativna analiza, optimizacija, strateški ciljevi

  • Анализа одрона у стенским косинама: савремени приступи

    Милош Марјановић (2023)
    У Србији и региону познате су бројне појаве одрона које су изазвале велике застоје саобраћаја, материјалне штете или чак имале фаталне исходе, па их је потребно непрестано пратити и изучавати. Mодeловањe одрона скопчано је са ниским нивоом поузданости, али савремене технологије омогућавају да сe такви изгледи донекле побољшају. Једна од технологија која чини искорак утом правцу јe LiDAR-ско скенирање, које обезбеђује детаљне топографске подлоге у виду облака тачака високе резолуције и тачности. Поступак анализе одрона може се свести на: ...
    одрони, осматрање, LiDAR, облак тачака, моделовање

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Fragmentation Size Prediction of Blasted Material Using a Specialized Software for Drilling and Blasting

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić, Miljan Gomilanović (2024)
    Design and optimizing the drilling and blasting parameters, should fill the requirements for the capacity, fragmentation size, and technical characteristics of loading and transport equipment, and enable a safe work at the open pit. Besides mentioned, it also achieves the minimal impact on the environment of the open pit and decreases the negative effects on the environment, especially in the blast vibration and flyrock. To obtain the best possible blasting effects and consider all the factors, a specialized software is ...
    optimization, O-Pitblast, drilling, blasting, fragmentation size

  • FrameNet Lexical Database: Presenting a Few Frames Within the Risk Domain

    Aleksandra Marković, Ranka Stanković, Natalija Tomić, Olivera Kitanović (2021)
    U radu se daje kratak prikaz teorije semantike okvira, na kojoj je zasnovana leksička baza Frejmnet. Predstavljena je koncepcija ove mreže, kao i mogućnosti njene primene. Predstavljena je i leksička analiza koja se primenjuje u projektu izrade Frejmneta i ukazano na razlike između analize zasnovane na okviru u odnosu na analizu zasnovanu na reči. Zatim je prikazano nekoliko povezanih okvira koje prizivaju reči iz domena rizika. U radu je predstavljena i platforma NLTК pomoću koje se mogu koristiti ...
    Srpski jezik, semantika okvira, FrameNet, scenario rizika, rudarski korpus, obrada prirodnog jezika
    ... in Berkeley since 1997. 8 Infotheca Vol. 21, No. 1, September 2021 Scientific paper 1.2 Frame semantics lexical analysis Frame semantics based lexical analysis comprises an analysis of the meaning of an LU, its lexical surroundings, phrases and grammatical constructions in which it appears in the ...
    ... as the possibility of implementing it in Serbian. We also take a close look at the lexical analysis used in the FrameNet development project and point out the differences between the frame-based lex- ical analysis and its word-based counterpart. This is followed by an illustration of a cou- ple of related ...
    ... a whole) in both Serbian and Croatian corpus data. They used distributional analysis whose main tenet is that word meaning can be defined based on the context in which the word appears, and additionally applied the analysis on the context itself. Frame semantics theory was used to analyze the context ...

  • 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
    ... Project administration, Methodology, Investigation, Funding acquisition, Formal analysis, Data curation, Conceptualization. Maja Todorović: Writing — review & editing, Visualization, Validation, Investigation, Formal analysis, Data curation. Aleksandar Jemcov: Writing – review & editing, Validation, ...
    ... water and aquifers is documented. • Different geological media exhibit distinct responses to pressure transients. • Tunnel pressure transient analysis as a tool for hydrogeological characterization. • Anefficient method for monitoring the environmental impact of HPP operations. Abstract ...
    ... of water pressure in the surrounding rock masses and observing the impact of hydraulic transients generated by HPP operation. A comprehensive analysis of monitoring data, incorporating ordinal and partial correlations and considering geological features, provides a profound understanding of ...

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

    Maja Milošević, Bojan Kostić (2022)
    ... application in the future. Characteristic properties of the sample were determined by chemical analysis, infrared spectrophotom- etry (Milošević and Logar, 2014; Milošević, 2011), differential thermal analysis (DTA) and X-ray diffrac- tion (powder, oriented, saturated and heated). The physical properties ...
    ... content were plotted on the triangular diagram, it was concluded that the sample is sandy clay with low porosity and low permeability. Chemical analysis showed that the sample mainly consists of 52.95% SiO2, 17.79% Al2O3, 1.02% K2O, 2.92% FeO, 6.34% CaO and 1.17% MgO, with a lower content of MnO (0 ...
    ... ng to carbonates and iron oxy/hydroxides, respectively. The clay from Svrljig (Serbia) was characterized by chemical, mineralogical and thermal analysis. All applied methods were in good agreement indicating that the studied clay has a high content of montmoril- lonite and a smaller amount of quartz ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... patterns, recorded in several different orientations (Table 2). Before analysis, the camera length (L) was calibrated by MAG*ICAL traceable TEM calibration standard to enhance the method”s precision. Quantitative analysis of electron diffraction was calculated according, to Bragg's law nA = 2d ...
    ... File S2: TEM-EDS analysis of the oxidised and reference arsenopyrite sample (Figuure S1). Author Contributions: Conceptualisation, LJ., A.P. and J.Z.; methodology, J.Z. and AŠ. (Andreja Šestan); software, A.Š. (Aleš Šoster); validation, LJ., A.P., A.K. and J.Z.; formal analysis, LJ., A.K., AŠ. ...
    ... published reports also highlight the possible micro-twinning, and other structural defects as the main obstacle hindering the precise structure analysis, suggesting, additional studies by transmission electron microscopy [10]. The basic investigations Crystals 2023, 13, 278. https:/ /doi.org,//10 ...