Претрага

Упит dcterms_subject_txt:Influence of synthesis method

2913 items

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

    Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević (2021)
    Изингов модел, хексагонална решетка
    ... possible. For the analysis of cases when even the biggest lattices were not large enough we introduced a method for investigation of criticality, utilizing the preset interface, that mimic the behavior in thermodynamic limit. By this method we discovered that for a range of disorders from zero up to ...
    ... the value of critical disorder. However, applying this method, it is impossible to obtain Rc with the satisfying accuracy, since it turns out that all values of Rc, from 0 to 0.31, give equally good fitting results. This was not the case for the square or triangular lattices. In inset of Fig. 20 in ...
    ... + σβδ = 2.06 ± 0.05. This indicates that the value of the supposed critical disorder is significantly smaller than the lower one obtained above, i.e., 0.20, or that it even tends to zero. To further test the value of Rc by the presented method of curve collapsing one would need to include the curves ...

  • Concepts for Improving Machine Learning Based Landslide Assessment

    Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić (2019)
    Katastar klizišta, Podložnost, Hazard, Mašinsko učenje, Uzorkovanje, Validacija
    ... satisfactory results and they outperformed logistic regression method by 8% (of overall accuracy), but in their case study MCDA method produced slightly better results than the SVM method. The study of Park et al. (2013) compared the abilities of frequency ratio (FR), analytic hierarchy process (AHP), logistic ...
    ... the training datasets, were used for testing/validating (separately for every sampling method), labeled Srte, S u te and Scte, respectively. Apart from enhancement of the inventory for increasing the number of landslide instances, the proposed strategy implies limiting the area for sampling non-landslide ...
    ... LR (all of them had >80% accuracy) outperformed AHP (with 69% accuracy). Although Ciurleo et al. (2017) did not deal with ML technique, it is safe to infer some conclusions from their work. They suggested that statistical (simple bivariate) approach based on the informative value method, tends to ...

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology

    Mihailo Škorić, Mauro Dragoni (2019)
    This paper is a result of a task that was presented to attendants of Keyword Search in Big Linked Data summer school, that was organized by Vienna University of Technology, under the Keystone COST action in the summer of 2017. It presents a specific approach to the classification via creation of minimal document surrogates based on the US National medical library’s MeSH ontology, which is derived from the Medical Subject Headings thesaurus. In a series of previously classified medically ...
    document classification, MeSH, ontology, information extraction

  • 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
    ... created based on the hydraulic impacts of HPPs in different geological environments along the tunnel route. The water pressure response enabled aquifer characterization of(1) a thin-layered, low-fissured aquifer closely related to the reservoir, with low influence on WMO transients; (2) a low- fissured ...
    ... with minimal to no influence on WMO transients; (3) a well-structured karst aquifer system influenced by WMO transients; (4) afault-controlled zone of deep hypogene karst aquifer discharge highly influenced by WMOo transients; and (5) an aquifer with a dominant development of the karst conduit ...
    ... Validation, Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Acknowledgement This work was supported by the Ministry of Science, Technological ...

  • Using Query Expansion for Cross-Lingual Mathematical Terminology Extraction

    Velislava Stoykova, Ranka Stanković (2018)
    ... (КЕУЗГОМЕ)" using pipeline method ог compilation Using Query Expansion јог Cross-Lingual Mathematical Terminology 157 and keyword web-browsing ог mathematical texts from Wikipedia, јп Bulgarian and in Serbian language. The preliminary work which reflect the creation and structure of both cor- pora contain ...
    ... радовима 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 ...
    ... survey of used techniques for semantic search and clustering by coni- paring keyword collocations to build a cross-lingual thesauri. The results of semantic keyword search for the two web electronic text corpora using Sketch Engine software are presented and analyzed with respect to the types of keyword ...

  • Компарација метода XRF i ICP-MS на узорцима угља и продуктима сагоревања

    Бранко Костић, Ксенија Ераковић, Дејан Прелевић, Сабина Ковач, Драгана Животић (2023)
    геохемија, угаљ, продукти сагоревања, XRF, ICP-MS

  • Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta

    Vesna Cvetkov (2020)

  • History of the development of the hydrodynamic model of the open pit mine “Drmno”, Serbia

    Dušan Polomčić, Jelena Ratković, Vesna Ristić Vakanjac (2023)
    With the creation of a hydrodynamic model, the need for it usually ceases until some next moment when the model needs to be updated and used for the set task for the necessary project documentation or dedicated studies. It is relatively rare that almost every year the model is improved and used for forecast calculations. The paper presents the basic characteristics and development of the hydrodynamic model of the open pit mine “Drmno” for 25 years. This open pit ...
    hidrodinamički model, površinski kop, rekalibracioni model, drenažni sistem

  • Knowledge Graphs in the Era of Large Language Models: Opportunities and Challenges

    Danka Jokić, Ranka Stanković, Jelena Jaćimović (2024)
    Pojava velikih jezičkih modela (eng. Large Language Models ili LLMs) je značajno uticala na oblast veštačke inteligencije, naročito u oblastima obrade prirodnog jezika i generisanju teksta. Međutim, ključno ograničenje ovih modela leži u nedostatku strukturiranog znanja i sposobnosti zaključivanja, što otežava njihovu primenu u stvarnom svetu, gde se zahteva tačnost iznetih činjenica i zaključivanje na osnovu konteksta. S druge strane, grafovi znanja nude primamljivo rešenje. Oni pružaju bogat izvor strukturiranog znanja, tako što predstavljaju entitete i njihove relacije u ...
    grafovi znanja, veliki jezički modeli, obrada prirodnog jezika, strukturirano znanje, kvalitet podataka, objašnjiva veštačka inteligencija, bezbednost sadržaja na internetu

  • Палеомагнетски резултати из Тимочког магматског комплекса, Источна Србија

    Весна Лесић, Емо Мартон, Драган Лукић, Весна Цветков (2018)

  • English for Geology Students. 1

    Lidija Beko (2023)
    Engleski jezik
    ... creatures with which we share our planet – every aspect of the Earth. Earth scientists, like their colleaguesin other fields, have developed a scientific method based on observation and collection of data, formu- lation and testing of hypothe- ses,leadingto the formulation oflaws or principles ...
    ... and acidity of the atmosphere, mean it is necessary for anyone visiting the Cave to wear a protective “ice suit”. The Caves have been flooded for much oftheir history, and the unique conditions of the heat and the solute content of the water is thought to account for the formation of the crystals ...
    ... радовима 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 ...

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... The concentrations of CO» and CHu in 2019 were the highest recorded in recent history [4]. It is assumed that human influence has led to the global retrcat of glacicrs since the 1990s and thc retreat of the surface of the Arctic Sea ice between 1979—1988 and 2010—2019 [4]. Global surface tempcratures ...
    ... 2023| 5] AR Synthesis Report: Climate Change 2023, in Proc. 60h 4ssessment Report during the Panel's 58th Session, Interlaken, Switzerland, 13-19 March 2023. https://www.ipcc.ch/report/sixth-assessment-report-cycle/ [pristupljeno 10.02.2023| 6] Paris agreement, in Proc. Conference of the Parties ...
    ... level of living standard have beecn accompanied by increased demand for various forms of cnergy. Most of the world's encrgy is still derived from fossil fuels. In 2021 the share of fossil fuels amounts 80.9%, while the share of biofuels and waste amounts 9.4%, indicating that more than 90% of annually ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...

  • Geochemical study of U, Th and REE mineralizations in Jurassic sediments and hydrochemical characterization of groundwaters in Eastern Serbia – Case study: Plavna area

    Jovan Kovačević, Maja Todorović, Marina Ćuk, Petar Papić (2016)
    jurski sedimenti, uran, torijum, elementi retkih zemalja, podzemna voda, istočna Srbija
    ... density was increased in the contact area of granitoid rock of Plavna and Jurassic sediments. Geochemical analyses were performed in an accredited ALS Chemex laboratory - Alba in Romania, where samples were analyzed on 38 elements (palette ME-MS81 by method ICP-MSS), which primarily analyzed radioactive ...
    ... spectrometry (HR ICP–MS). Sector ICP/MS using a Finnegan Mat ELEMENT 2 467 instrument for 57 elements. To test the accuracy and precision of the method, NIST® 1643e “Trace Elements in Water” SRM was analyzed and compared to the certificate values. Geochemist's Workbench (GWB) and Visual Minteq ...
    ... slight increase of LREEs. Thus, low concentrations of ΣREEs and REE patterns appear to result from several causes including the dilution of HREEs in concert with a slight enrichment of LREEs by mixing, the removal of REEs likely due to the formation of carbonate precipitates and the co-precipitation ...

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation
    ... geolocation. The main disadvantage of this search method is the inability to search for the documents themselves. Site-wide Search is incomparably more significant because it corrects the main disadvantage of the previous method and allows searching for all the items of the digital library including documents ...
    ... important. This search method includes three search options: keyword, Boolean and exact match. Keyword search returns results sorted by relevance. For example, if a compound term “upravljanje kvalitetom uglja” (coal quality management) is searched, the result will first be a list of documents containing ...
    ... debates, regardless of language barriers or their IT skills. HLT consists of a number of basic applications that allow the processing of languages within the framework of the wider programming systems (Vitas et al., 2012). Within the University of Belgrade HLT Group, a number of HLT tools and resources ...