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Упит dcterms_subject_txt:Hierarchical cluster analysis

827 items

  • Anticipated sulfur dioxide emissions from coal-fired power plants

    Aleksandar Madžarevic, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac (2024)
    Southeastern Europe (SEE), which includes Serbia, along with Germany and Poland, is one of the largest producers of solid fuels in Europe. Despite growing environmental concerns, coal, especially lignite, persists and remains the dominant fuel for electricity generation in this region. Concurrently, these power plants emerge as the predominant emitters of pollutants in all the observed states. To conduct a comprehensive analysis, data on major emitters within the European Union were gathered, allowing for a detailed comparison with SEE ...
    energetika, emisije, SO2, ugalj, elektrane, Srbija

  • 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

  • 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

  • Regional Debris Flow Hazard Assessment of the Grdelica Gorge (Serbia)

    Miloš Marjanović, Biljana Abolmasov, Jelka Krušić, Uroš Đurić (2024)
    procena hazarda, tečenje drobine, daljina dospevanja, RAMMS, regionalna razmera

  • 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 ...

  • Using Query Expansion for Cross-Lingual Mathematical Terminology Extraction

    Velislava Stoykova, Ranka Stanković (2018)
    ... Хи M Mg мнажество KOMTO _ИЗКУСТВО ~ warpw MayKa центљр KOHTO аЛГебра аритметика тајета Ка aaswiasa пе 52037 ре mdaba) _ Lemma Scote Бг _ Cluster ње 5336 63 105 1308 46] одо 16.296, 39] 016.264. 68] u 10 286 беј гакоде 10.266, Тј pn [0.25. Р Peo ј 385 531 о АИАА — Naji{0,279, 24] фегаћига ...
    ... keyword's synonyms are closer semantic equivalents than others. From termino- logical point of view (for knowledge discovery) it means to discover hierarchical conceptual relations of certain domain and to build a thesauri, i.e. generating semantic hierarchy by extracting keywords semantic conceptual ...
    ... hidden connections of that keyword to its semantically related words. It can, also, be used to enlarge and elaborate the terminological conceptual hierarchical thesauri representation. 160 V. Stoykova and R. Stankovic математика ж&кт freq = 262 (3,826.71 рег milion} Lemma Score Freg Gluster техника ...

  • 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

  • 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

  • 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

  • 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 ...

  • Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils

    Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)
    MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii

  • 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 ...

  • Semantic Textual Similarity of Courses Based on Text Embeddings

    Olivera Kitanović, Aleksandra Tomašević, Mihailo Škorić, Ranka Stanković, Ljiljana Kolonja (2024)
    This paper explores the application of textual embeddings to measure semantic similarity between educational courses’ curriculums, aiming to enhance the effectiveness of the next faculty accreditation. Leveraging state-of-the-art natural language processing techniques, we employ pre-trained embeddings to capture the semantic meaning of course descriptions. Our methodology involves transforming course curriculum texts into high-dimensional vector representations, enabling efficient and meaningful comparisons. We evaluate the proposed approach on a diverse dataset of course descriptions, employing established benchmarks for semantic textual similarity ...
    ... Tomić, Marko Vještica, Milan Čeliković, JIvan Luković, and Slavica Kordić Large Language Models Comparative Analysis of Traditional and Large Language Models for Sentiment Analysis in the Serbian Language .........cc.. Nikola Đorđević and Suzana Stojković Semantic Exploration of Industrial ...
    ... The text corpus of course descriptions is also used via TXM platform (Hciden 2010) for textometric analysis and visualization of results. We found that TXM is more appro- priate for the analysis of clusters for professors, modules and study programs, but this Wwill be also an extension of the current ...
    ... for Research. Studies in Classification, Data Analysis, and Knowledge Organization, pp. 561—569. Springer, Berlin, Heidelberg (2010). https://doi.org/ 10.1007/078-3-642-10745-0_61 Heiden, S.: The TXM platform: building open-source textual analysis software compatible with the TEI encoding scheme ...

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • 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 ...

  • 3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia

    Saša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac (2013)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... groups or clusters based on similarity. Applied in: a.Identification of Similar States - Clustering algorithms such as K-Means, DBSCAN, or Hierarchical Clustering can be used to identify similar patterns in pump operation data. For example, clustering may reveal that certain data sets indicate ...
    ... SYSTEMS 3.1 Explanation of dynamograms in oil production The basis for diagnosing issues in downhole pump operation is the analysis of dynamogram shapes. This analysis uses theoretical, surface, and downhole dynamograms. By comparing the shapes of dynamograms obtained from measured data with ...
    ... more maintainable program and is often more accurate in identifying spam. 18 Ready for Use () problem ng Evaluation ol analysis i Solutions (5 error analysis Figure 4.2 Machine learning approach If spammers notice that your filter blocks messages containing the word "Your" in the ...