Претрага

Упит dcterms_creator_txt:Petrović T.

836 items

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... (11), was used. The result is shown in Figure 6.5. p(k) = |a(k)| (2) 53 10 40 5 08 % 06 5 --- N_ 20 04 — 5 0 02 5 00 0 T T T T T T LI 00 02 04 06 08 10 0 20 40 60 [I 100 Figure 6.5. Application of the Fourier Transform to a normalized dynamometric chart Jrom a well using ...
    ... dynamogram represents a function formed by a closed curve of measured values of load and stroke of the smooth rod, defined by the general function(F(t) = f(S(t)). Here, the abscissa shows the variation in the stroke of the smooth rod over one cycle of the deep well pump operation (including both the upward ...
    ... useful information as possible. Applied in: a.Data Visualization - Using methods like Principal Component Analysis (PCA) or t- Distributed Stochastic Neighbor Embedding (t-SNE), you can visualize high- dimensional data in 2D or 3D space. This can help in identifying patterns in the data that indicate ...

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... j(ј), l(л), lj(љ), m(м), n(н), nj(њ), r(р), v(в) obstruents b(б), c(ц), č(ч), ć(ћ), d(д), dž(џ), đ(ђ), f(ф), g(г), h(х), k(к), p(п), s(с), š(ш), t(т), z(з), ž(ж) Two further aspects of Serbian must be taken into consideration. First, the consonant r is syllabic (i.e. it forms a syllable nucleus) ...
    ... Popović, 1999, or Piper & Klajn, 2013). By manner of articulation, phonemes are classified as plosives (their graphemic representations are b, p, d, t, g, k), affricates (c, č, ć, dž, đ), fricatives (f, z, s, ž, š, h), nasals (m, n, nj), laterals (l, lj), a vibrant (r) and semivowels (v, j). The Serbian ...
    ... of thumb, the fit is considered satisfactory if 𝐶 < 0.02 (Mačutek & Wimmer, 2013). Strauss et al. (2008, p. 11) formulated the hypothesis that „[t]he rank-frequency distribu- tion of syllables behaves like the rank-frequency distribution of words“. Word frequencies mostly follow Zipf-like distributions ...

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Simulation of Hydrogeological Environmental Discharge in Case of Interruption Constant Observations

    Marina Čokorilo Ilić, Dragoljub Bajić, Miroslav Popović (2024)
    Monitoring Network, data, hydrogeological environment, tunnel, simulation

  • An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)

    N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero (2020)
    Paleontology,Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics,Oceanography

  • Regionalno-geološke karakteristike miocenskih sedimenata na prostoru severnog Banata

    Dejan N. Radivojević (2014-12-30)
    Predmet doktorske disertacije predstavljalo je rešavanje strukturno‐stratigrafskihodnosa miocenskih sedimenata na prostoru severnog Banata. U cilju regionalnogsagledavanja, korišćeni su svi raspoloživi geofizički i geološki podaci sa širegistražnog područja, odnosno iz celog Panonskog basena i susednog orogena. Osimklasičnih metoda primenjene su i savremene metode seizmostratigrafije,tektonostratigrafije i riftne sekvencione stratigrafije. Primenjene metode omogućilesu izradu modela progradacije ivice šelfa za ceo Panonski basen, modela uzajamnihveza između basena i geodinamičkog modela jugoistočnog oboda basena.Jezero Panon je većim delom zapunjeno prilivom sedimenata paleo‐Dunavom saseverozapada, odnosno ...
    Centralni Paratetis, Panonski basen, miocen, jezero Panon,seizmostratigrafija, sekvenciona stratigrafija, paleogeografija, geodinamika
    ... Baldi, T., 1975, Holostratotypus: Eger. In: Báldi, T. and, J. Senes (Eds.), OM Egerien. Die Egerer, Pouzdraner, Puchkirchener Schichtengruppe und die Bretkaer Formation. Chronostratigraphie und Neostratotypen, Miozän der zentralen Paratethys, v. 5, p. 97–112. Baldi, T., 1980, A ...
    ... akneriana, Elphidium aculeatum, E. crispum, E. antoninum, E. josephinum, E. hauerinum, Porosononion granosum, Triloculina consobrina, T. austriaca, T. inflata, Aurila notata itd. Pored toga, M. Buljan je (u periodu 1964–1983) utvrdila raznovrsnu faunu brakičnih mekušaca predstavljenu vrstama: ...
    ... Petroleum Geology, v. 31/1, p. 53–69. Baldi, T., 1969, On the Oligo/Miocene stages of the Middle Paratethys area and the Egerian formations in Hungary. Annales Universitatis Scientiarum Budapestiensis, Sectio Geologia, v. 12, p. 19–28. Baldi, T., 1973, Mollusc Fauna of Hungarian Upper Oligocene ...

  • Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian

    Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić (2020)
    The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...
    Part-of-Speech tagging, lemmatization, corpus, evaluation, Serbian, morphological dictionary
    ... history textbook. Novels was composed of excerpts from the Serbian part of ELTeC corpus containing novels published between 1840 and 1920.3 Text Tokens T-Types Words W-Types 1984 108,133 18,117 69,706 18,050 VERNE 73,826 12,298 59,706 12,266 INTERA 1,071,200 56,743 907,643 55,470 ŠVEJK 4,122 1,484 ...
    ... 23rd Pacific Asia Conference on Language, Informa- tion and Computation, PACLIC 23, Hong Kong, China, December 3-5, 2009, pages 110–119. Erjavec, T. (2012). Multext-east: morphosyntactic re- sources for central and eastern european languages. Lan- guage resources and evaluation, 46(1):131–142. ...
    ... Parsing. To appear. Huang, Z., Xu, W., and Yu, K. (2015). Bidirectional LSTM-CRF Models for Sequence Tagging. Krstev, C., Vitas, D., and Erjavec, T. (2004). Morpho- Syntactic Descriptions in MULTEXT-East-the Case of Serbian. Informatica, 28(4):431–436. Krstev, C., Obradović, I., Utvić, M., and ...

  • First paleomagnetic and magnetic anisotropy results from Montenegrо - the coastal area

    Emö Márton, Vesna Cvetkov, Martin Đaković, Vesna Lesić, Slobodan Radusinović (2021)
    ... developed in a carbonate platform environment from the Middle Triassic till theend of the Cretaceous. In this unit flysch sedimentation started after the K/T boundary.From the above units we drilled and oriented in situ a total of 248 samples representing ninelocalities from the Dalmatian, six from the Budva ...

  • The Rift Sequence Stratigraphy of the Itebej Field (Pannonian Basin, Serbia)

    Saša Ivanišević, Jelena Radišić, Ivana Isić, Dejan Radivojević (2019)
    ... sequence stratigraphy, reef sediments, petroleum system References Tari, G., P. Dovenyi, I. Dunkl, F. Horvath, L. Lenkey, M. Ștefănescu, P. Szafian, and T. Toth, 1999. Lithospheric structure of the Pannonian basin derived from seismic, gravity and geothermal data, in The Mediterranean Basins: extension ...

  • Strain partitioning along a curved strike-slip fault system during indentation: inferences from analogue modelling

    Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... у  супротном b=1.    Уколико постоји резервоар запремине Vcs у dm 3, тада се параметар L рачуна као L=0,0945– 0,0055·t, ако је t<10mm, односно као L=0,394/t, ако је t≥10mm, где је t дебљина изолације  у mm.    Добијен  резултат,  односно  Сезонску  ефикасност  E  треба  дати  заокружену  на  једну  ...
    ... ·K‐1) док је Т температура гаса у К.   На основу претходног, може се спровести интеграција члана А’ (90):  2 pp TRz M pdp TRz M dp TRz Mp dp 2 2 2 1 srsr 2 1 srsr 2 1 2 1 − ⋅⋅ = ⋅⋅ = ⋅⋅ ⋅ =ρ ∫∫ ∫           (90)  Где се просечна температура дефинише као:  2 TT T 21 sr + =   ...
    ... 4298435730+22897756035‐1333799622.    У првој итерацији се на основу израза (158) добија вектор поправки:   [ΔI’, ΔII’, ΔIII’] T=[‐0.136692092, 0.09381301, ‐0.014444497]T    Детаљан прорачун за прву итерацију се даје у табели 10.      ‐ 78 ‐ Дејан Бркић, Докторска дисертација        Taбела 10. ...

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... у  супротном b=1.    Уколико постоји резервоар запремине Vcs у dm 3, тада се параметар L рачуна као L=0,0945– 0,0055·t, ако је t<10mm, односно као L=0,394/t, ако је t≥10mm, где је t дебљина изолације  у mm.    Добијен  резултат,  односно  Сезонску  ефикасност  E  треба  дати  заокружену  на  једну  ...
    ... ·K‐1) док је Т температура гаса у К.   На основу претходног, може се спровести интеграција члана А’ (90):  2 pp TRz M pdp TRz M dp TRz Mp dp 2 2 2 1 srsr 2 1 srsr 2 1 2 1 − ⋅⋅ = ⋅⋅ = ⋅⋅ ⋅ =ρ ∫∫ ∫           (90)  Где се просечна температура дефинише као:  2 TT T 21 sr + =   ...
    ... 4298435730+22897756035‐1333799622.    У првој итерацији се на основу израза (158) добија вектор поправки:   [ΔI’, ΔII’, ΔIII’] T=[‐0.136692092, 0.09381301, ‐0.014444497]T    Детаљан прорачун за прву итерацију се даје у табели 10.      ‐ 78 ‐ Дејан Бркић, Докторска дисертација        Taбела 10. ...

  • Регионални приступ изради карте угрожености подземних вода Србије - нова метода Издан

    Милановић Саша, Стевановић Зоран, Ђурић Душан, Петровић Тања, Миловановић Милица (2010)

  • Portable geotechnics-using android smart phones and tablets for geotechnical filed investigations

    Đurić Uroš, Abolmasov Biljana, Petrović Dragana, Marjanović Miloš, Kuzmić Petar (2013)

  • Osnovni principi rukovanja amonijum nitratom

    Kričak Lazar, Petrović D., Negovanović Milanka, Janković Ivan, Zeković Dario (2010)

  • Development of non explosive fuel mixture for non-invasive procedures of obtaining the blocks of decorative stones

    Kričak Lazar, Petrović D., Negovanović Milanka, Janković Ivan, Zeković Dario (2011)

  • Geothermal potential, chemical characteristic and utilization of groundwater in Serbia

    Tanja Petrović Pantić, Katarina Atanasković Samolov, Jana Štrbački, Milan Tomić (2021)
    To collect and unify data about all geothermal resources in Serbia, a database was formed. The database allows us to perceive the geothermal resources of Serbia and their potential for utilization. Based on the data available in the geothermal database, the estimated temperatures of reservoirs, heat power, and geothermal energy utilization were calculated. The database contains 293 geothermal records (springs, boreholes) registered at 160 locations, with groundwater temperatures in the range between 20 and 111 °C. The maximum expected ...
    Geothermal database, Geothermal resources, Geothermal potential, Hydrochemistry, Hierarchical cluster analysis, Serbia

  • Transboundary groundwater resource management: needs for monitoring the Cijevna River Basin (Montenegro–Albania)

    Momčilo Blagojević, Zoran Stevanović, Milan Radulović, Veljko Marinović, Branislav Petrović (2020)
    The transboundary Cijevna River Basin shared between Albania and Montenegro has a surface area of 650 km2. It is extremely important for water management, especially in the country of Montenegro which is downstream. Due to the high permeability of both the karst and intergranular aquifers that exist in the basin, the River Cijevna sinks along the length of its riverbed and in summer months it usually dries up completely at the confluence section. Hydrometry surveys undertaken during a drought ...
    Upravljanje međugraničnim vodama, ranjivost podzemnih voda, monitoring mreža, karstne izdani, Albanija, Crna Gora

  • Режим изданских вода карстног платоа Бабине (ЈЗ Србија, Пријепоље)

    Бранислав Петровић, Вељко Мариновић, Зоран Стевановић, Саша Милановић, Љиљана Васић (2021)
    карст, подземне воде, трасирање, Пријепоље