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Упит dcterms_subject_txt:mechanical extraction methods,

572 items

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... only choice when it comes to mechanical methods of exploitation. This is why rod pumping is the oldest and most widely used type of mechanical method worldwide, with approximately two-thirds of all production wells globally employing this method for fluid extraction. The purpose of this paper is ...
    ... economically viable value additional energy must be supplied to continue extraction. If fluid production is achieved using additional energy, this method of exploitation is called a mechanical method. Today, the mechanical methods used for oil reservoir exploitation worldwide include [1,2|: 1. Sucker ...
    ... a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element ofthe system enables optimization, which entails benefits in the form of increased efficiency ...

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... language tools [10]. In other words, more sophisticated keyword extraction methods in the text preprocessing step usually use some heuristics to gain in performance by using semantic or syntactic knowledge. As the source of syntactic knowledge, methods usually use part-of-speech tags (POS) in order to restrict ...
    ... (translating) Serbian and English keywords, a larger set of keywords can be obtained. This is the advantage of bilingual keyword extraction, which standard methods for keyword extraction cannot reach, and remains an open question for future work. Table 3 represents two different examples of abstracts in the ...
    ... Meštrović, A., Martinčić-Ipšić, S.: An overview of graph-based keyword extraction methods and approaches. J. Inf. Organ. Sci. 39(1), 1–20 (2015) 2. Mihalcea, R., Tarau, P.: TextRank: bringing order into texts. In: Proceedings of Empirical Methods in Natural Language Processing - EMNLP 2004, pp. 404–411. ACL ...

  • Project REASONING: Characterization and technological procedures for recycling and reusing of the rudnik mine flotation tailings

    Vesna Cvetkov, Vladimir Simić, Stefan Petrović, Filip Arnaut, Milena Kostović, Dragan Radulović, Jovica Stojanović, Vladimir Jovanović, Dejan Todorović, Nina Nikolić, Jelena Senćanski, Grozdanka Bogdanović, Dragana Marilović (2024)

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • Terminological and lexical resources used to provide open multilingual educational resources

    Biljana Lazić, Danica Seničić, Aleksandra Tomašević, Bojan Zlatić (2016)
    Open educational resources (OER) within BAEKTEL (Blending Academic and Entrepreneurial Knowledge in Technology enhanced learning) network will be available in different languages, mostly in the languages of Western Balkans, Russian and English. University of Belgrade (UB) hosts a central repository based on: BAEKTEL Metadata Portal (BMP), terminological web application for management, browse and search of terminological resources, web services for linguistic support (query expansion, information retrieval, OER indexing, etc.), annotation of selected resources and OER repository on local edX ...
    otvoreni obrazovni resursi, leksički resursi, obrada prirodnih jezika, terminologija
    ... e translation option. Successful methods used in automatic term extraction can be applied to units that belong to the general lexica, as well. The potential expansion of such resources would inevitably lead to a more fruitful information retrieval and extraction, providing an invaluable education ...
    ... semiautomatic approach for term recognition, extraction and lemmatization. Picture 1 illustrates steps in terminology extraction. Crucial resources are morphological dictionaries and grammars. They are combined with some statistical measures for term extraction. The first step is analysis of terms in ...
    ... specific domains (e. g. law, biomedicine, mythology, culinary etc.). 5. TERMINOLOGY EXTRACTION Bearing in mind rapid changes in scientific domains and new terms production, automatic terminology recognition and extraction has become an important task. The extracted terms are then included in ontologies ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... pattern) and definition language grammar. The second section of this paper discusses the problem of dictionary definition modelling and methods for automatic extraction of candidates for dictionary definitions. The third section provides an analysis of lexical and syntactic characteristics of dictionary ...
    ... 2021), we focused our present research on the extraction of the sentences contained in the definition. The extraction also implies recognition of paradigmatic lexical relations, e.g. synonyms, antonyms, hypernyms, hyponyms. The problem of automatic extraction of definitions from the text has not been ...
    ... approach for definition modelling and extraction, relying on the existing Serbian dictionaries (morphological and descriptive), as well as the results of the preliminary experiments in automatic extraction of definitions from unstructured Serbian text. Definition extraction task can be formalized either ...

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci
    ... compiling a comprehensive multilingual lexical database of raw material terminology, lexicographic methods for automatic knowledge extraction are used, including corpus data analysis, automatic data extraction, editing and publishing extracted data in (online) dictionaries. Using extracted lexicographically ...
    ... important role in raw material terminology, and have also been included in this research. Some important related issues discussed are collocation extraction methods, the use of domain labels, lexical and semantic relations, definitions and subentries. Keywords: raw material; mining; terminology; dictionary; ...
    ... important role in raw material terminology, and have also been included in this research. Some important related issues discussed are collocation extraction methods, the use of domain labels, lexical and semantic relations, definitions and subentries. Keywords: raw material; mining; terminology; dictionary; ...

  • Parallel Bidirectionally Pretrained Taggers as Feature Generators

    Ranka Stanković, Mihailo Škorić, Branislava Šandrih Todorović (2022)
    In a setting where multiple automatic annotation approaches coexist and advance separately but none completely solve a specific problem, the key might be in their combination and integration. This paper outlines a scalable architecture for Part-of-Speech tagging using multiple standalone annotation systems as feature generators for a stacked classifier. It also explores automatic resource expansion via dataset augmentation and bidirectional training in order to increase the number of taggers and to maximize the impact of the composite system, which ...
    анотација, обрада природног језика, издвајање обележја, композитне структуре, врста речи

  • Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++

    Branislava Šandrih, Ranka Stanković (2020)
    U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...
    ekstrakcija terminologije, validacija terminologije, GIZA++, grafovi, Unitex, klasifikacija teksta
    ... intend to enrich bi-list with newly produced pairs. Our experiments also show that both methods of extraction produce some different pairs of equivalent terms. In our future work we will use not only both methods, when a dictionary for a source language becomes available, but also terms obtained from ...
    ... Terminology Extraction 5 TermEx Infotheca Vol. 19, No. 2, December 2019 123 Šandrih B., Stanković R., “Extraction of Bilingual . . . ”, pp. 119–138 This list can be either an external resource from the same domain or obtained from the text. The only system developed specifically for the extraction of MWTs ...
    ... information). A Software solution for multi-word units extraction displayed in Figure 2 offers possibilities for general NLP processing on selected corpus (apply- ing lexical resources, generating bag of words and extraction of unknown words), extraction of selected syntactic patterns applying specified op- ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... Geology, Belgrade, Serbia radmila.gacinarpf.bg.ac.rs; bojan.dimitrijevicorgf.bg.ac.rs; sanja.bajicorgf.bg.ac.rs Abstract: Coal extraction in the form ofopen and underground methods is accompanied by the degradation ofland, change in landscape formation and changing the flora and fauna. It is significantly ...
    ... of closing the surface mine. 254 Table 1 shows comparison of the methods that can be applied to select the purpose of the terrain after reclamation, their feature, advantages and disadvantages. Table 1. Comparison of methods which can be used for choosing a recultivation solution Method Feature ...
    ... existing: reclamation methods by introduction of improvements and new solutions to the process, in order to increase quality and yield of the reclaimed land. This paper and the presented examples aim to show the comprehensiveness and applicability of multi- criteria methods for choosing the purpose ...

  • Rule-based Automatic Multi-word Term Extraction and Lemmatization

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac (2016)
    In this paper we present a rule-based method for multi-word term extraction that relies on extensive lexical resources in the form of electronic dictionaries and finite-state transducers for modelling various syntactic structures of multi-word terms. The same technology is used for lemmatization of extracted multi-word terms, which is unavoidable for highly inflected languages in order to pass extracted data to evaluators and subsequently to terminological e-dictionaries and databases. The approach is illustrated on a corpus of Serbian texts from ...
    term extraction, terminology, multi-word units, lemmatization, finite-state transducers
    ... terms and statistical measures to deal with ambiguities and rank candidate terms is given in (Bounhas&Slimani, 2009). Several hybrid methods for extraction of MWT candidates that use both syntactic patterns and statistical measures, mainly for filtering, are described in (Koeva, 2007) for ...
    ... and graphs in Section 4. The solution to terminology extraction outlined in this paper will by all means speed up the development of e-dictionaries, as in addition to the terminology extraction, the approach can be applied to the extraction of MWUs belonging to general lexica. Expanding the e- ...
    ... Automatic Multi-word Term Extraction and Lemmatization Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Rule-based Automatic Multi-word Term Extraction and Lemmatization | Ranka ...

  • Contrastive Analysis of Syntax Patterns in Comparable Football Corpora in Spanish and Serbian Languages

    Jelena Lazarević, Olivera Kitanović (2024.)
    Cilj rada je istraživanje kolokabilnosti kao načina na koji se leksičke jedinice povezuju sa rečima iz različitih kategorija, formirajući veće jedinice. Istraživanje semantičkih i sintaksičkih principa ovih kombinacija u španskom i srpskom jeziku fudbala izvedeno je na komparabilnim fudbalskim korpusima SrFudKo i EsFudko, razvijenim u okviru doktorske disertacije Jelene Lazarević pod nazivom: Jezičke odlike diskursa novih medija o fudbalu: kontrastivna analiza na korpusu srpskog i španskog jezika. Korpus fudbala SrFudKo, kreiran na osnovu tekstova o fudbalu sa pet srpskih veb-portala: ...
    fudbal, korpusi, terminologija, kolokacije, srpski, španski

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... by mechanical properties are the most important in the application of ash as road-building material. Mechanical properties of fly ash have been determined on the test samples. The experiments were done based on the standards that are in use in the European Union. The following mechanical tests ...
    ... in three ways: by the content of reactive silica (SiO2), according to the granulometric composition and mechanical properties. Pozzolanic properties of the fly ash determined by the mechanical properties are the most important in the application of ash as road-building material. Depending on the ...
    ... 481 000 L 6 % 440 000 C 6 % 374 000 L 6 % 469 000 C 6 % 312 000 L 6 % 455 000 C 6 % 338 000 3.5.4 Dependencies between the mechanical properties After the mechanical properties test completion according to EN standards, the dependencies were made between: - the uniaxial compressive strength ...

  • Hybrid Model for Optimisation of Waste Dump Design and Site Selection in Open Pit Mining

    Aleksandar Doderovic, Svetozar-Milan Doderovic, Sasa Stepanovic, Mirjana Bankovic, Dejan Stevanovic (2023)
    Waste management is an unavoidable technological operation in the process of raw material extraction. The main characteristic of this technological operation is the handling of large quantities of waste material, which can amount to several hundred million cubic metres. At the same time, this operation must comply with all administrative and environmental standards. Therefore, optimising waste rock management (particularly haulage and dumping) has the potential to significantly improve the overall value of the project. This paper presents a hybrid ...
    projektovanje odlagališta i izbor lokacije, hibridni model, optimizacija, genetski algoritam

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • 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

  • 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
    ... managed by “RockSix” so�ware (Vinci Technologies). For ten representative Mesozoic samples, the extraction of bitumen was also performed in order to test Rock-Eval parameters before and a�er extraction. �e usual dichloromethane/ methanol azeotrope (88:12) solvent was used for 32 hours (Schwarzbauer ...
    ... managed by “RockSix” software (Vinci Technologies). For ten representative Mesozoic samples, the extraction of bitumen was also performed in order to test Rock-Eval parameters before and after extraction. The usual dichloromethane/ methanol azeotrope (88:12) solvent was used for 32 hours (Schwarzbauer ...
    ... Jurassic and seven Cretaceous) from eight localities were also ana- lysed a�er the extraction of free hydrocarbons, in order to check the e�ect of bitumen. �e results revealed an increase in T max a�er extraction of up to 6 °C (∆T max; Tab. 2). Organic petrography and vitrinite reflectance �e ...

  • A Lexical Approach to Acronyms and their Definitions

    Cvetana Krstev, Duško Vitas, Ranka Stanković (2015)
    In this paper we present a comprehensive approach to acronyms for Natural-Language Processing (NLP) of Serbian texts. The proposed procedure includes extraction of acronyms and their definitions that are usual Multi-Word Units (MWUs), shallow parsing of MWUs that enables MWU lemmatization and production of entries in morphological electronic dictionaries, both for MWU and acronyms, that are provided with grammatical, syntactic, semantic and domain information. This approach enables representation that reflects complex relations between acronyms and their definitions.
    ... patterns within text: towards an automated construction of comprehensive acronym-definition dictionaries. Methods of informa- tion in medicine, 41(5):426–434. Yeates, S., 1999. Automatic extraction of acronyms from text. In New Zealand Computer Science Research Stu- dents’ Conference. ...
    ... traction and lemmatization graphs. The final results were obtained from all texts. Extraction graphs: They are used in Step 1. Since we were looking for acronym definitions locally, we used for the extraction two simple patterns: beg1 definition between1 acronym end1 beg2 acronym between2 definition ...
    ... Tsimpouris et al., 2014) or shallow parsing methods (Pustejovsky et al., 2001). The second task is sometimes performed manually (Tsimpouris et al., 2014), by using some heuristics (Yeates, 1999; Schwartz and Hearst, 2003; Wren et al., 2002) or machine-learning methods (Jacobs et al., 2014). A window in which ...

  • Отпад из процеса сагоревања угља као сировина за добијање елемената ретких земаља

    Бојан Земљак (2024)
    Због великог броја индустрија у којима се користе ови ресурси, глобална економија се у великој мери ослања на елементе ретких земаља. Елементи ретких земаља су есенцијална сировина — материјал за развој савремених технологија, али у односу на њихову огромну потражњу, њихово вађење је ограничено и повезано је са значајним утицајима на животну средину. Због њихове ограничене доступности, проблема који се јављају при процесима експлоатације, све више и више земаља почиње да тражи повољније могућности вађења елемената [REE] из секундарних ...
    Елементи ретких земаља, резерве, употреба, представници и методе опоравка елемената ретких земаља
    ... and Deng, Z.G., 2002. Extraction of rare carth metals by liquid surfactant membranes containing: Cyanex 272 as a carrier. Mining and Metallurgical Engineering(China), 22(3), p.74-78. [201] Raji, M., Abolghasemi, H., Safdari, J. and Kargari, A., 2018. Selective extraction of dysprosium from acidic ...
    ... Purification Technology, 320, p.124132. [204] Juang, R.S., Chen, J.D. and Huan, H.C., 2000. Dispersion-free membrane extraction: case studies of metal ion and organic acid extraction. Jowrma! of u Membrane Science, 165(1), p.59-73. [205] James, M., Cassidy, D., Goossens, D.J. and Withers, R.L., ...
    ... Lima, J.L. and Zagatto, E.A., 2009. Liquid-liquid extraction in flow analysis: A critical review. Analytica chimica acta, 652(1-2), p.54- 65. [219] Janssen, C.H., Macias-Ruvalcaba, N.A., Aguilar-Martinez, M. and Kobrak, M.N., 2015. Metal extraction to ionic liquids: the relationship between structure ...

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... happened in several different phases and the extraction in phases with milder extraction agents had occurred. In case of neodymium, the nature of soil is important in particular, since only in certain extraction phases there came to ion extraction, and also due to slightly different neodymium ...
    ... stic for humus. The extraction was noticed in ion exchange phase (Phase I) and in extraction phases with acids (Phases IV and V). The results show that in sand soil about 80 % of neodymium ions have been extracted and in the clay type of soil 96 % (Table VI). The extraction from humus soil was ...
    ... quantities depend on soil type, nature of extraction agent and metallic ion characteristics. Neodymium, first of all, due to its ionic diameter reacts differently with soil. For that reason the extraction happened only with solutions of certain extraction agents depending on their nature and ionic ...