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Упит dcterms_subject_txt:Well Performance Optimization

297 items

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Keyword-Based Search on Bilingual Digital Libraries

    Ranka Stanković, Cvetana Krstev, Duško Vitas, Nikola Vulović, Olivera Kitanović (2017)
    This paper outlines the main features of Biblisha, a tool that offers various possibilities of enhancing queries submitted to large collections of aligned parallel text residing in bilingual digital library. Biblishsa supports keyword queries as an intuitive way of specifying information needs. The keyword queries initiated, in Serbian or English, can be expanded, both semantically, morphologically and in other language, using different supporting monolingual and bilingual resources. Terminological and lexical resources are of various types, such as wordnets, electronic ...

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... In addition to that, as the importance of efficient and flexible database search and information extraction on the web is growing each day, performance of the search related to mining engineering data can be greatly improved by the use of RudOnto in query expansion [10]. Given the variety ...
    ... In addition to that, Moodle is being used as a grading tool, for assigning scores to activities, and as a tool to monitor student activity and performance. Finally, Moodle also turned to be a handy tool in exchanging personal messages between students and teachers. Terminology is an important ...
    ... pp. 226–237, 2010. [7] Krstev, C., Stankovic, R., Vitas, D., Obradovic, I., The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines in 6th LREC, Marrakech, Marocco, 2008. [8] Mitrović, A., Devedžić, V., A model of multitutor ontology-based learning ...

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... modules have not been used, although several modules related to additional activities have been tested, but their functionality in terms of performance was not satisfactory. After the test period, a total of 15 courses were created on Moodle during the academic year 2010/11, with about 450 ...
    ... developed set of grading tools enabling teachers to assign scores to activities based on different criteria, and monitor student activity and performance. As an e-learning support tool Moodle offers various forms of interaction and information sharing between teachers and students and among ...
    ... Moodle enhanced the interest of the students in a number of subjects, Informatics I in specific, at the same time improving their scores and performance. Finally, a higher degree of interaction between teachers and students has also been achieved. One line of further development of this e ...

  • 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
    ... growth of a set of test documents, its performance further decreases, which was not desirable in solving our task. In this paper, we experiment with a simple classification approach to evaluate the importance of timely management of large amounts of data, as well as the usable value of semantics stored ...
    ... identifier vectors and a simple set of rules. 5. Evaluation of document classification performance for each of the sets used. This stage allows us to reflect on and compare different classification rules, as well as to determine whether some rulesets can (and to what extent) be considered successful ...
    ... the proposed ap- proach within a very complex task. Future work will focus on the decrease of false positive results in order to boost the overall performance of the system. The classification based on ontologies does not depend on the domain in which it is applied, but it certainly depends on the resources ...

  • Optimising in electrical energy consumption in mining plants

    Snežana Aleksandrović, Vesna Damnjanović, Ilija Jeftenić (2018)

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • Razvoj modela upravljanja cirkulacijom u postupku bušenja korišćenjem neuro fazi sistema zaključivanja

    Seyed Ali S. Razeghi (2022)
    Gubitak isplake predstavlja nekontrolisano isticanje bušaćeg fluida kroz formacije kao što su kaverne, pukotine, ili drugi slojevi. Tradicionalne metode procene gubitka isplake se zasnivaju na primeni seizmičkih podataka ili pronalasku „mesta“ gubitka isplake na osnovu raspoloživih podataka iz susednih bušotina. Međutim, ove metode procene nisu pouzdane.‘ U disertaciji je izvršena analiza i procena uticaja parametara bušenja, geoloških faktora, karakteristika formacije i fluida na gubitak isplake kao i na formiranje fraktura u formacijama. Uspostavljeni su modeli koji podrazumevaju proces obrade ...
    naftna bušotina, gubitak isplake, fuzzy logika, ANFIS model

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... planned facilities which led to the production of a new technological project. For these reasons, the importance of geotechnical investigations performance is presented within this paper. Keywords: landfill, geotechnical investigations, transfer station 1. INTRODUCTION Sebia's EU accession implies ...
    ... 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 is available at: www.dr.rgf.bg.ac.rs Proceedings SARDINIA2019. © 2019 CISA Publisher. All ...
    ... selection of municipal waste (primary and secondary), area for use and processing of unselected waste (biological treatments, thermal treatments) as well as area for mechanical treatment of waste, which significantly reduces waste volume before final disposal at the landfill, either by shredding or ...

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... ekologija.gov.rs/sites/default/files/old-documents/Buka/Uredbe/uredba.pdf (accessed on 19 June 2021). 57. International Finance Corporation—WB Group, Performance Standard 1—Social and Environmental Assessment and Manage- ment Systems; Environmental, Health, and Safety (EHS) Guidelines, 1. Environmental—1 ...
    ... 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 is available at: www.dr.rgf.bg.ac.rs Energies 2021, 14, 6174. https://doi.org/10.3 ...
    ... 6174 12 of 15 The manner of presenting the results of the impact assessment in SEA (visualization) is particularly important for investors, as well as decision makers, who often have modest knowledge in this area and have a very important role in this final phase of the SEA pro- cess. Clear ...

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    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, multi-word units, noun phrases, query expansion
    ... as a new functionality of LeXimir, and makes use of our comprehensive e- dictionaries of Serbian simple words. We present an evaluation of the performance of this functionality, and hence of our procedure, obtained from experiments on two types of data. Finally, we discuss some further possible applications ...
    ... supported by Unitex. To that end, only the dictionary look-up module would have to be changed. D. Procedure Evaluation In order to evaluate the performance of LeXimir’s function- ality for automated generation of MWU lemmas, and hence our procedure and our strategy, we have performed experi- ments ...
    ... and common nouns (about 80%). The rationale for such an approach was the fact, indicated by the analysis of the first set of data, that system performance tends to decrease considerably in the case of toponyms. The results illustrated by Fig. 7 confirm the conclusion that toponyms can be viewed as ...

  • Fault type assessment based on vertical gravity gradient anomalies – advantages and limitations

    Ivana Vasiljević, Snežana Ignjatović, Branislav Sretković (2024)
    The type of dip-slip faults can be assessed based on the analysis of vertical gravity gradients. Theoretically, just a simple comparation of the gradient extreme values can give us an answer whether the fault is normal or reverse (thrust). Practical application of this method is far more complicated and the results depend on a number of parameters, such as a complexity of geological setting, the quality of gravity data, dip angle and displacement of the fault, density contrast, etc. ...
    dip-slip faults, vertical gravity gradients, field data analysis
    ... Essa et al. (2021), who developed a method for the assessment of fault parameters from the gravity anomaly data using the global particle swarm optimization. Some authors (Toushmalani, 2010, Wahyudi et al., 2016, Wada et al., 2017, Sumintadireja et al., 2018) prefer to utilize gravity horizontal ...
    ... REFERENCES Essa K.S., Gćraud Y., Diraison M., 2021: Fault parameters assessment from the gravity data profiles applying the global particle swarm optimization. Journal of Petroleum Science and Engineering, 207: 109129 Kusumoto S., 2017: Eigenvector of gravity gradient tensor for estimating fault dips ...
    ... 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 is available at: www.dr.rgf.bg.ac.rs TToceéno u30anue na Geologica Macedonica, N0.6 MAKE OHCKO ...

  • Formative evaluation of e-learning projects with the logical framework approach

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... criterion, of a project (evaluand). The purposes of the evaluation of an e-learning project are different: to determine the impact on beneficiaries' performance, to compare projects, to support the improvement of projects in terms of socio-economic effects and impacts, on individuals and organizations, ...
    ... of a project (evaluand). The purposes of the evaluation of an e- learning project are different: to determine the impact on beneficiaries' performance, to compare projects, to support the improvement of projects in terms of socio- economic effects and impacts, on individuals and organizations ...
    ... 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 is available at: www.dr.rgf.bg.ac.rs The Sixth International Conference on e-Learning (eLea ...

  • Optimizacija vodosnabdevanja podzemnim vodama u Srbiji

    Dušan Polomčić, Zoran Stevanović, Petar Dokmanović, Vesna Ristić-Vakanjac, Bojan Hajdin, Saša Milanović, Dragoljub Bajić (2012)
    ... publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs XIV OPTIMIZACIJA VODOSNABDEVANJA PODZEMNIM VODAMA U SRBIJI OPTIMIZATION OF GROUNDWATER SUPPLY IN SERBIA Dušan 1 ...
    ... monitoring, legislation XIV SRPSKI HIDROGEOLOSKI SIMPOZIJUM sa medunarodnim uéeScem OPTIMIZACIJA VODOSNABDEVANJA PODZEMNIM VODAMA U SRBIJI OPTIMIZATION OF GROUNDWATER SUPPLY IN SERBIA Dugan Poloméic’, Zoran Stevanovié', Petar Dokmanovié', Vesna Ristié Vakanjac’, Bojan Hajdin’, SaSa Milanovic', ...
    ... in Serbia are presented according to specific aquifer types. Special attention has been paid to the Serbian legislative regarding groundwater as well as the implementation of the European provisional guidelines for water on the status of groundwater in Serbia. : water supply, groundwater reserves ...

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • Serbian NER&Beyond: The Archaic and the Modern Intertwinned

    Branislava Šandrih Todorović, Cvetana Krstev, Ranka Stanković, Milica Ikonić Nešić (2021)
    U ovom radu predstavljamo srpski književni korpus koji se razvija pod okriljem COST Akcije „Distant Reading for European Literary History” CA16204. Koristeći ovaj korpus romana napisanih pre više od jednog veka, razvili smo i učinili javno dostupnim Sistem za prepoznavanje imenovanih entiteta (NER) obučen da prepozna 7 različitih tipova imenovanih entiteta, sa konvolucionom neuronskom mrežom (CNN), koja ima F1 rezultat od ≈91% na test skupu podataka. Ovaj model je dalje ocenjen na posebnom skupu podataka za evaluaciju. Završavamo poređenje ...
    ... rily on similar texts, which can be seen from the model’s performance on the test set displayed in Table 3. Since this collec- tion of novels contains very diverse texts, both lexically and syntactically, SrpCNNER did not generalize that well on unseen texts. 6 Conclusions and Future Work We presented ...
    ... entity, facility, organization, and vehicle)3 was published in (Bamman et al., 2019). The aut- hors’ main motivation was to asses NER mo- dels’ performance on different types of texts. Their conclusion was that recognition impro- ved for almost all entity types when literary texts were used for the both ...
    ... adjusted SrpNER to these specific texts that differ significantly from newspaper texts for which SrpNER was primarily developed in order to improve its performance and facilitate the work of evaluators. Some modifications of rules and used lexicons were done for the whole collection (e.g. Danas ‘today’ cannot ...

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... Pollution. Legal and physical entity who use natural resources are obliged to keep up to date during the execution of works and performance of activities, as well as after their termination, plans and implements measures to prevent endangerment of the environment. Namely, whoever degrades the ...
    ... land reclamation activities in accordance with the reclamation project (Law on Mining and geological research, 101/2015,95/2018, 40/2021). The performance of mining exploitation is conditioned by the existence of prepared and approved investment-technical and project documentation, and the scope ...
    ... 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 is available at: www.dr.rgf.bg.ac.rs 'UNDERGROUND MINING ENGINEERING 42 (2023) 27-36 UDK 62 'UNIVERSITY ...

  • 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
    ... result is highly dependent on the quality of the input data, the assumptions made to set up the model design and the selection of the appropriate performance metrics (PETSCHKO et al. 2014). Furthermore, the evaluation of reliability consists of changing some of the model integral parts and obtaining ...
    ... additional WTLSR models is performed in the same manner as for the TLSR models using the landslide inventory maps. In the final stage, by detailed performance analysis of all maps generated by the models, an optimal one can be chosen as being the most representative of the particular region of in- terest ...
    ... consider the landslide percentage per susceptibility class as a ref- erence, and compare the TLSR with the WTLRS models. The model with the highest performance is not necessarily the most sensitive one, and in addition, it can be more sensitive to the change of the parameter that is not weighted with the ...

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... synergetic approach for assessing and improving equipment performance in offshore industry based on dependability. Reliab. Eng. Syst. Saf. 2006, 91, 10–19. [CrossRef] 12. Ivezic, D.; Tanasijevic, M.; Ignjatovic, D. Fuzzy Approach to Dependability Performance Evaluation. Qual. Reliab. Eng. Int. 2008, 24, 779–792 ...
    ... analysis are significant because of the known fact that the machine must, above all, be available for operation, in order to realize other operating performance. American military standard (MIL-STD) Energies 2019, 12, 4044; doi:10.3390/en12214044 www.mdpi.com/journal/energies energies (mort, Article ...
    ... analysis are significant because of the known fact that the machine must, above all, be available for operation, in order to realize other operating performance. American military standard (MIL-STD) Energies 2019, 12, 4044; doi:10.3390/en12214044 www.mdpi.com/journal/energies Energies 2019, 12, 4044 ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)