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Упит dcterms_subject_txt:gravity survey

237 items

  • Analiza rada električnih centrifugalnih pumpi

    Milica Stanojević (2024)
    Ovaj rad analizira rad električne centrifugalne pumpe (ESP) u naftnoj industriji, sa fokusom na problem taloženja kamenca (karbonatnih naslaga) unutar sistema. Električne centrifugalne pumpe (ESP) predstavljaju srce mnogih naftnih bušotina. Njihova visoka pouzdanost i sposobnost rada u zahtevnim uslovima čine ih neophodnim za stabilnu i kontinuiranu proizvodnju.Senzori igraju ključnu ulogu u praćenju rada ESP sistema i detekciji ranih znakova taloženja kamenca. Problem taloženja kamenca je izuzetno značajan, jer može dovesti do smanjenja efikasnosti pumpe, povećanja troškova održavanja, i dugoročnih zastoja ...
    električne centrifugalne pumpe (ESP), formiranje kamenca (karbonatnih naslaga), hemijski inhibitori
    ... motora ESP-a, dok promene temperature fluida mogu ukazivati na promene u rezervoaru ili pojavu problema kao što su gasni džepovi (SLB, "Temperature Survey," n.d.). 4.3 Vibracioni senzor Vibracije u ESP sistemu su često znak mehaničkih problema, poput habanja ležajeva, nebalansiranih delova pumpe ...
    ... er 18.SLB, „PTMS Data Sheet“, n.d. URL: https:/6 nywW.slb.com/- /media/feature/products/data-sheets/ptms_data_sheet.pdf 19.SLB, „Temperature Survey”, n.d. URL: https://glossary.slb.com/en/terms/t/temperature_survey 20.SLB, „Jibratory Seismic Dana“, n.d. URL: https://glossary.slb.com/en/t ...

  • Analiza softvera za projektovanje ESP sistema

    Aleksandar Sredojević (2024)
    U momentu kada pritisak na dnu bušotine nije dovoljan da savlada ukupne gubitke pritisaka od dna bušotine do separatora, proizvodnja pomoću ležišne energije nije više moguća i bušotina prestaje sa eruptivnim radom. Kako bi ponovo omogućili proizvodnju fluida iz bušotine, potrebno je primeniti neke od mehaničkih metoda eksploatacije. Najprimenljivije mehaničke metode eksploatacije su: gas lift (GL), dubinske pumpe sa klipnim šipkama (SRP), električne uronjene centrifugalne pumpe (ESP), zavojne pumpe (PCP) i hidraulične pumpe (HP). Jadna od tih metoda koja ...
    električna centrifugalna pumpa (ESP), proizvodnja fluida, mehaničke metode eksploatacije, Prosper, Pipesim
    ... kao ı konstruisanje IPR krive. Ovo Jje prikazano na slikama 6-2 i 6-3. '' i PVT - INPUTDATA (X-1.Out) 'Solution GOR. 605999 Ol Gravity 857.5 | Gas Gravity 0.814 Mole PercentN2 5,51 Pb, Rs, Bo Correlaton Glaso- | Od Viscosity Correlaton Beal et al Other Data Viscosity | Emuson | Pumo ...
    ... Properties | Viscosity | Calibration | Thermal STOCK TANK PROPERTIES Watercut v |72 % GOR v |60,6 sm3/sm3 Gas specific gravity: 0,814 \Water specific gravity: | 1.02 DOD v |857,5 kg/m3 [[] PIPESIM Save as template CONTAMINANT MOLE FRACTIONS v CO2fraction: 0.0222 Y| H2Sfraction: ...
    ... (prikazano na slici 6–5), podzemna oprema (prikazano na slici 6-6) i površinska dizna ako je potrebno (prikazano na slici 6–7). |B | DEVIATION SURVEY (X-1.Out) — a x 5 o O ~ OO m > O |M — Slika 6-6: Prozor za unos podataka za inklinometriju 65 B DOWNHOLE EQUIPMENT (X-1.Out) ...

  • Simple 2D gravity–density inversion for the modeling of the basin basement: example from the Banat area, Serbia

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić (2019)
    We have developed a technique to calculate lateral density distribution of the sedimentary basin basement by combining linear gravity–density inversion and 2D forward modeling. The procedure requires gravity anomaly data, depth-to-basement data and density data for the sediments (density–depth distribution). Gravity efect of density variations in the basement was extracted from the total gravity anomaly by removing the joint efect of the sediments with vertical density variations and homogeneous basement of average density contrast (calculated by 2D modeling). Gravity ...
    funkcije raspodele gustine, lateralna raspodela gustine, karta gustine podloge

  • Advancing Sentiment Analysis in Serbian Literature: A Zero and Few-Shot Learning Approach Using the Mistral Model

    Milica Ikonić Nešić, Saša Petalinkar, Mihailo Škorić, Ranka Stanković, Biljana Rujević (2024)
    Ova studija predstavlja analizu sentimenta srpskih starih romana iz perioda 1840-1920, koristeći veliki jezički model (LLM) Mistral za tehniku učenja sa zasnovani na takozvanim "zero" i "few-shot" pokušajima. Glavni pristup uvodi inovacije osmišljavanjem istraživačkih upita (promptova) uključuju tekst sa uputstvom za klasifikaciju bez primera i na osnovu nekoliko primera, omogućavajući jezičkom modelu da klasifikuje osećanja u pozitivne, negativne ili objektivne kategorije. Ova metodologija ima za cilj da pojednostavi analizu osećanja ograničavanjem odgovora, čime se povećava preciznost ...
    zero-shot, few-shot, sentiment, Serbian, Mistral model

  • LRMI markup of OER content within the BAEKTEL project

    Ranka Stanković, Daniela Carlucci, Olivera Kitanović, Nikola Vulović, Bojan Zlatić (2015)
    ... IEEE Standard for Learning Object Metadata, 2002. [5] Friesen, N., Technical Evaluation Report, 40. The International Learning Object Metadata Survey, CanCore Initiative, 2004. http://www.irrodl.org/index.php/irrodl/article/view/1 95/277 [6] Obradović, I., Stanković, R., Using technology for ...

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... also contains tools for calculations, key performance indicators (KPIs), actions, partitions, aggregations, etc. The browser option serves for data survey and within this slot different dimensions to be used for calculating the number of injuries can be defined in a quick and simple manner. 13th ...

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities

  • Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise

    Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín (2023)
    Multidisciplinary

  • The analysis of the geothermal energy capacity for power generation in Serbia

    Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)
    Renewable Energy, Sustainability and the Environment
    ... G. MILIVOJEVI] a, Maja M. TODOROVI] a, and Marina D. ]UK a a University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia b Geological Survey of Serbia, Belgrade, Serbia Original scientific paper DOI: 10.2298/TSCI120215033S An estimate of deep groundwater temperature is necessary for the ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... Cvjetko Sandić2, Miralem Mulać3, Petar Begović4 1) University of Belgrade Faculty of Mining and Geology, Đušina 7, Belgrade, Serbia 2) Geological Survey of the Republic of Srpska, Vuka Karadzica 148 B, Zvornik, Bosnia and Herzegovina 3) Headquarters of Civil Protection Tuzla, Aleja Alije Izetbegovića4 ...

  • New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)

    Nevenka Đerić, Nataša Gerzina (2014)
    Gornja kreda, radiolarije, Jadar blok, zapadni pojas Vardarske zone, zapadna Srbija
    ... PERCH- NIELSEN K. (eds.): Plankton stratigraphy.- Cambridge University Press, Cambridge, 631—712. SAVEZNI GEOLOŠKI ZAVOD (Federal Geological Survey) (1970): Geološka karta SFR Jugoslavije, 1:500000 [Geo/ogic Map of SFR Yugoslavia, 1:500 000|, Beograd. SCHAALF, A. (1985): Un nouvcau canevas ...

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian

    Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih (2021)
    Uvredljivi govor na društvenim medijima, uključujući psovke, pogrdni govor i govor mržnje, dostigao je nivo pandemije. Sistem koji bi bio u stanju da detektuje takve tekstove mogao bi da pomogne da internet i društveni mediji postanu bolji virtuelni prostor sa više poštovanja. Istraživanja i komercijalna primena u ovoj oblasti do sada su bili fokusirani uglavnom na engleski jezik. Ovaj rad predstavlja rad na izgradnji AbCoSER-a, prvog korpusa uvredljivog govora na srpskom jeziku. Korpus se sastoji od 6.436 ručno označenih ...
    uvredljivi jezik, govor mržnje, srpski, tviter, leksikon, korpus
    ... https://www.dagstuhl.de/oasics/ https://www.dagstuhl.de 13:2 Building Language Resources for Abusive Language Detection in Serbian According to a survey from 2014, 60% of Internet users witnessed name-calling, 25% saw that someone was physically threatened, and 24% noticed abuse over a long period [14] ...
    ... Ruths. A web of hate: Tackling hateful speech in online social spaces. arXiv preprint, 2017. arXiv:1709.10159. 38 Anna Schmidt and Michael Wiegand. A survey on hate speech detection using natural language processing. In Proceedings of the Ąfth international workshop on natural language processing for social ...

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... deposits have not been rehabilitated, the material from the deposits have scattered over the years in the environment through the aeolian process, gravity and water flows. Tailing material from the analyzed deposits shows permanent toxic pollution of water and agricultural land [13]. All atmospheric water ...
    ... According to the “2012 Minerals Yearbook, Mining and quarrying trends (advance release)” published by the U.S. Department of the Interior, U.S. Geological Survey, in the U.S. total waste from mining and ore processing in 2012 was around 5210 million tons [4]. It is interesting that in the previous report, there ...
    ... Commission of the European Communities: Brussels, Belgium, 2003. 4. Ewell, M. 2012 Minerals Yearbook: Mining and Quarrying Trends; U.S. Geological Survey: Reston, VA, USA, 2014. 5. Ministarstvo nauke i zaštite životne sredine. Izveštaj o stanju životne sredine u Republici Srbiji 2003. i 2004; Agencija ...

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Geomagnetna bura kategorije G5 u maju 2024. godine

    Magdalena Marčeva (2024)
    Zemlja poseduje magnetno polje, koje je generisano u njenom spoljašnjem jezgru. Magnetno polje Zemlje je konstantno izloženo dejstvu sunčevog magnetnog polja i zračenja koje se sa Sunca emituje. Naelektrisane čestice koje pristižu sa Sunca stupaju u interakciju sa magnetosferom, što dovodi do različitih geomagnetnih poremećaja.Geomagnetna aktivnost direktno je proporcionalna intenzitetu sunčevog zračenja koje dolazi do Zemlje. Pod uticajem sunčevog korpuskularnog zračenja dolazi do pojave geomagnetnih bura koje su praćene porastom intenziteta magnetnog polja.Količina i jačina dolaznog sunčevog zračenja zavisi ...
    magnetosfera, sunčevo zračenje, geomagnetna bura, indeksi geomagnetne aktivnosti, polarna svetlost
    ... godine Slika 5.4.2. Prednosti X, Y i Z komponente geomagnetnog polja na Geomagnetoj opservatoriji Grocka, Srbija(INTERMAGNET-British Geological Survey, 2024. Geomagnetic data from the GCK observatory URL:( https://imag- data.bgs.ac.uk/GIN_F1/GINForms2?observatorylagaCode =GCKd&publicationSt ...
    ... Climate, 7, A33. URL:https://www.sWSc- journal.org/articles/swsc/full_html/2017/01/swsc170014/swsc170014.html INTERMAGNET-British Geological Survey, 2024. Geomagnetic data from the GCK observatory. URL:https://imag- data.bgs.ac.uk/GIN_VI1/GINForms2?observatorylagaCode=GCK &publication ...

  • 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
    ... Respondents were mechanical and electrical engineers and machine operators with more than five years of maintenance work experience. Table 1 shows the survey results completed by five respondents. Table 1. Membership degree of the fuzzy sets based on expert judgment. Analyst Fuzzy Set Minor Low Moderate ...
    ... was obtained based on estimations given by the Symmetry 2020, 12, 525 15 of 26 maintenance workers at the quarry. Five employees completed the survey, in which they stated the membership percentage for a specific fuzzy set or sets. The questionnaire was defined in such a way that the overall assessment ...
    ... detecting potential failures before they occur is an indicator that can only be determined based on experience. As with the failure severity indicator, a survey was conducted, in which maintenance workers completed the questionnaire described in Section 3.2.2. The indicator of the probability of detecting ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... planning technique (Critical Path Method), because of its suitability for representing the logical structure of environmental protection system. The survey was conducted in the area of the city of Kostolac. The examined area included mining and energy complexes in Kostolac, which incorporate three surface ...
    ... FDES, etc.) and ranked. This leads to the formation of a basis of activities that will be organized by the project management process. • Based on the survey results, we can propose the project management process elaborated through Critical Path Method as a suitable model for the environmental management ...
    ... Development, Republic of Serbia. Author Contributions: Jelena Malenović Nikolić and Dejan Vasović conceived and designed the structure of the survey; Jelena Malenović Nikolić and Ivica Ristović performed the application of CPM method and analyzed the empirical data; and Stevan Mušicki and Ivana ...

  • A necessary and sufficient condition for an algebraic integer to be a Salem number

    Dragan Stankov (2019)
    We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • Using Query Expansion for Cross-Lingual Mathematical Terminology Extraction

    Velislava Stoykova, Ranka Stanković (2018)