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Упит dcterms_subject_txt:surface functional groups

277 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
    ... steel used for making sucker rods varies. Based on the steel composition, pumping rods are generally classified into tvo groups: carbon– manganese and nickel-molybdenum groups. The latter alloy group may include additional elements to enhance strength, improve structural properties, and achieve ...
    ... is the oldest method for bringing fluids from wells to the surface and is also the most widely used practice globally (over 80%). The basic principle of operation of a rod pump relies on transferring driving energy from the surface to the level of the submerged rod pump through a mechanical ...
    ... of a deep well pump is crafted from high-quality steel tubing. A molten metal layer is applied to the heated surface of the plunger, which is then ground and polished. The outer surface of the plunger features U-shaped channels, which are beneficial in conditions where mechanical impurities might ...

  • Српски језик у дигиталном добу -- The Serbian Language in the Digital Age

    Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević (2012)
    Serbian language
    ... gether representatives from highly fragmented and di- verse groups of stakeholders. e present White Paper was prepared together with volumes for 29 other lan- guages. e shared technology vision was developed in three sectorial Vision Groups. e META Technology Council was established in order to discuss ...
    ... unsatisfactory results of students onPISA testing, serve as impulses for themodernisation of language instruction and for putting a greater em- phasis on functional literacy and communication skills. is is being reflected both in the current educational reform (goals of language instruction, standards to be ...
    ... shortage of courses in Serbian that would systemat- ically prepare future experts for successful professional communication and develop appropriate functional lit- eracy. e application of language technology methods could certainly contribute to the modernisation of in- struction, for example, by way of ...

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... assessment of regular failure occurrences; the evaluation of the level of risk and measures that should be taken for a system to retain its designed functional characteristics. The initial idea for this paper was to create a model that comprehensively analyzes risk elements and synergistically integrates ...
    ... system using this methodology, it is necessary to rationally divide the system into subsystems and the subsystems into elements—that is, into functional units that each affect the risk indicators. The engineering system (the crushing machine) was divided into eight subsystems: the hydraulic, engine ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... Conceptual design of the TEL platform An overview of the conceptual design of our TEL platform is depicted in Fig. 1. The platform consists of four groups of components, namely: • Tools - composed of FMG CMS, an in-house Content Management System (CMS) developed by the University of Belgrade, Faculty ...

  • 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
    ... retrieved MWU forms and lemmas 510 Površinska povreda ‘surface injury’ was ranked lower by CValue (27) than by Freq (17) because it is part of two other MWUs with three components. One of them, površinska povreda potkolenice ‘surface lower leg injury’ was ranked higher by CValue (867) than ...
    ... whether it is a correct lemma. The precision of retrieval was calculated for each of these tasks and the results are presented in Figures 3and 4 for groups of hundreds ranked by basic measures: Frequency, C-Value, T-Score, and Keyness and one combined measure TKValue = T-Score * Keyness. Mean average ...

  • Projekcija razvoja osmatračke mreže podzemnih voda u Republici Srbiji

    Petar Dokmanović, Zoran Stevanović, Saša Milanović, Bojan Hajdin, Vesna Ristić-Vakanjac, Veljko Marinović (2016)
    ... Map of RS“ 6/Data base of FMG-DHG 7/CORINE Land Cover Map (2006). In order of rational maintenance of the network, a part of GWB is integrated in Groups of GWB (GGWB), so that total number of (G)GWB is 91, 58 of which are (single) GWB. Basic criteria for the projection of monitoring network were ...

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • Strukture kristala - odabrana poglavlja iz kristalografije i njena multidisciplinarnost

    Ljiljana Karanović (2024)
    Kristalografija

  • Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking

    Ranka Stanković, Milica Ikonić Nešić, Olja Perisic, Mihailo Škorić, Olivera Kitanović (2024)
    U radu se prikazuju rezultati istraživanja vezanih za pripremu paralelnih korpusa, fokusirajući se na transformaciju u RDF grafove koristeći NLP Interchange Format (NIF) za lingvističku anotaciju. Pružamo pregled paralelnog korpusa koji je korišćen u ovom studijskom slučaju, kao i proces označavanja delova govora, lematizacije i prepoznavanja imenovanih entiteta (NER). Zatim opisujemo povezivanje imenovanih entiteta (NEL), konverziju podataka u RDF, i uključivanje NIF anotacija. Proizvedene NIF datoteke su evaluirane kroz istraživanje triplestore-a korišćenjem SPARQL upita. Na kraju, razmatra se povezivanje Linked ...
    paralelni korpusi, povezivanje imenovanih entiteta, prepoznavanje imenovanih entiteta, NER, NEL, povezani podaci, NIF, Vikipodaci

  • 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

  • Automatic construction of a morphological dictionary of multi-word units

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Duško Vitas, Miloš Utvić (2010)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multiwordn units, noun phrases, query expansion
    ... (604). As the analysis in the first step indicated that MWU proper names produce in general worse results, we decided to separate these lists in two groups. After removing those already in DELAC we got a list of MWU toponyms (206) and a list of MWU common nouns (784). Table 5 shows that in the case of ...

  • Wordnet Development Using a Multifunctional Tool

    Ivan Obradović, Ranka Stanković (2007)
    In this paper we present a multifunctional tool for manipulating heterogeneous language resources. The tool handles electronic dictionaries, wordnets and aligned texts, and provides for their synchronous use in various tasks. We focus here on the description of the possibilities this tool offers in the development of wordnets. Besides the wordnet module which enables parallel handling of two wordnets, other modules, such as the module for morphological dictionaries and the module for aligned texts, as well as available finite ...
    Wordnet development, language resource integration, HLT tools
    ... several enhancements of the tool on basis of user feedback. Such enhancements include specific search mechanisms and mechanisms for extraction of groups of synsets on basis of various criteria. The HLT group is now working on porting the most important functions of WS4LR on the web. The ambition ...

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... energy sources, N: ( ) 1 ln , n i i i i n H P P P N= = − =∑ (11) The higher value of Shannon index, the greater is the diversity of observed groups of elements. Results of Shannon index for diversity of energy resources for Serbia in 2014 [9], and for few European countries are presented in ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Softverski alati za korišćenje resursa za srpski jezik

    Ivan Obradović, Ranka Stanković (2008)
    ... are essentially also functions of WS4LR, since WS4QE practi- cally represents a web upgrade of functions al- ready developed in WS4LR. 3.1 The functional model and characteristics of WS4LR WS4LR is a modularly organized system with the aim of providing the following functions: – management of ...

  • Development of terminological resources for expert knowledge: a case study in mining

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Aleksandar Cvjetić (2015)

  • Actual contamination of the Danube and Sava rivers at Belgrade (2013)

    Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)
    rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening
    ... vary and differ significantly, the employment of these values is partially res- tricted. The soil remediation intervention values indicate when the functional properties of a soil for humans, plant and animal life are seriously impaired or threatened. They are representative of the level of contamination ...
    ... care products, etc. Many of them are known to have, or are suspected to have, toxic, ecotoxic or endocrinic effects at trace levels. Note- worthy, surface water is becoming more and more relevant as a source of drink- ing water. Therefore, an appropriate water quality control is needed as a base for ...
    ... Herzegovina and Serbia. The Sava River Basin covers a catchment area of 95 719 km2, which is approximately 40 % of the countries’ combined total surface area and it is the source of more than 80 % of the total available freshwater in the area. Only a few publications have considered contamination ...

  • Influence of Initial Treatment on the Survival and Recurrence in Patients With Differentiated Thyroid Microcarcinoma

    Jasna Mihailović, Ljubomir Stefanović, Ranka Stanković (2013)
    ... and staged according to the Union for International Cancer Control (IUCC) 7th edition of TNM classi- fication.25 Patients’ categorization into risk groups was made ac- cording to the pathologist’s reports and the 2006 European consensus guideline.20 Treatment Surgery The Oncology Institute is a referral ...

  • Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia

    Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)
    Stratigraphy,Economic Geology,Geology,Geophysics,Oceanography

  • Stepen metamorfizma metaklastita rudnika

    Vanja Ćuk (2024)
    Zadatak ovog rada je bio, potvrda saznanja da se na planini Rudnik dogodio kontaktni metamorfizam gornjokrednih sedimentnih stena i da se ispita intenzitet kontakto-metamorfnih promena. Posle kraćeg opisa geografskog položaja, pregleda ranijih istraživanja i geologije šireg područja, usmerena je pažnja na petrološka ispitivanja metaklastita i na kontaktno-metamorfne facije. Usled stvaranja različitih vulkanogenih facija odnosno usled vulkanskih erupcija, delovanjem zagrejane magme (lave) ili zagrejanih fluida, došlo je do kontaktnog metamorfizma, na granici oligocen-miocen i do stvaranja različitih metamorfnih stena, a ...
    Kontaktni metamorfizam, Rudnik, metakonglomerati, metapeščari, metaalveroliti