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Упит dcterms_subject_txt:water shut-off

171 items

  • Softverski alati za korišćenje resursa za srpski jezik

    Ivan Obradović, Ranka Stanković (2008)
    ... reducing precision, which rep- resents the ration of relevant document obtained to the total number of documents obtained. In vies of this trade-off between recall and preci- sion, the words or strings that are used in a query must be carefully selected in order to obtain an optimal balance between ...

  • 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
    ... za rad. Kontinualno merenje pritiska na dnu bušotine se izvodi na relativno lak način. Nagib bušotine ne predstavlja problem. Primenjiva za „off-shore“ bušotine. Hemijski tretmani u cilju rešavanja operativnih problema (talozi soli i parafina, emulzije i korozija) lako se izvode. Zavisno ...

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • Оптимална конструкција бушотине на експлоатационом пољу Мајдан

    Бранислав Миловановић (2024)
    Одређивање параметара конструкције бушотине представља најважнији корак ка сигурном и ефикасном опремању сваке бушотине. У овом раду биће предложен поступак за одређивање оптималних параметара експлоатационог поља Мајдан. Пример експлоатационог поља Мајдан ће бити коришћен за илустрацију предложеног поступка. Ово поље има специфичне геолошке и хидрогеолошке карактеристике које ће бити детаљно анализиране у раду. На основу ових анализа, биће предложени оптимални параметри бушотине који ће осигурати сигурно и ефикасно опремање бушотина на овом подручју.
    заштитне цеви, поље Мајдан, конструкција бушотине
    ... HOBDIHHHCKOM KOJIOHOM y JUy)KHHH OJL HajMaPe 150 m. V HacraBKy OymmePa H3 TEXHHUKC KOJIOHC 3aHTHTHHXICBH (ajIH HajBMmIe 15 m) Mopa ce MHaBecrM LOT (Leak Off Test) y mmwuby Me(QMHHcamDa (ObpakrypHor rpamMjeHra (QopManuje HcHoJ HeTe KOMOHe. Taj monaTak CJIy)kKHM 3a onpeljuiBabe MaKcHMaLHc Moryhe rycrHHc ...

  • 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

  • Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides

    Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)
    analogno modelovanje, raspodela deformacija, geometrija indentera, Černa i Timok rasedni sistem
    ... more gradual. Also, notably less structures accommodate shortening south of the indenter, while north of the indenter new structures (i.e., splaying off of the main strike-slip zone; Fig. 5) form that do not exist in brittle-only models. Comparing M7 with M10 shows that main the dextral shear zone evolves ...
    ... Sokoutis, D., Willingshofer, E., Picken, S.J., 2019. New analogue materials for nonlinear lithosphere rheology, with an application to slab break-off. Tectonophysics 756, 73–96. Broerse, T., Krstekanić, N., Kasbergen, C., Willingshofer, E., 2021. Mapping and classifying large deformation from digital ...
    ... At the end of each experiment, two post-kinematic layers of black and white sand are added on top of the entire model to preserve topography and water is sprinkled on the sand layers to increase cohesion within the sand and to allow for sectioning of the experiments to obtain information on the ...

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... porting sys- tem Reserves of solid mineral raw materials Potential Potential Total explored geological reserves in situ, balanced and/or off-balanced Exploitation reserves (balanced reserves minus mining losses and/or dilution after the analysis of all modifying factors) but not ...
    ... may ask for a de- tailed regulation plan, particularly if the exploration target is close to some category of protected area or vulnerable area (water courses and vicinity of populated areas). The total procedure to obtain all permits related to exploration is usually 1–6 months depend- ing on required ...
    ... tory documents—approval of reserves and reclamation/recultivation project—must be submitted to the ministry in charge of agriculture, forestry, and water management. After the approval from the Ministry, necessary changes are made at the municipal level. Summarising the actual land use change procedures ...

  • 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
    ... The landfill surface is cracked as a result of lack of water. Between landfill dam and the Ibar is a tree line with ground vegetation. Steep slopes of the landfill ravine are present as a result of erosion. Drainage of atmospheric waters, fallen off the surface of the landfill, is done by drainage pipes ...
    ... process, gravity and water flows. Tailing material from the analyzed deposits shows permanent toxic pollution of water and agricultural land [13]. All atmospheric water and waters from tailing ponds are released into the Ibar River through drainage systems in the tailings. The water bodies from the area ...
    ... flotation ponds. Criteria Analyzed Criteria C1 Proximity of water source C2 Proximity of the settlement C3 Proximity of agricultural area C4 Proximity of permanent water flow C5 Quantity of material deposed C6 Existence of the flooding water sources C7 Activity of the tailings C8 Geological environment ...

  • Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia

    Predrag Radović, Miloš Radonjić, Emmanuel Billia (2020)
    Finds of Pleistocene rhinoceros are rare in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East ern Serbia). Both the morphological and metric characteristics of the teeth are consis tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no ...
    rhinoceros, Stephanorhinus hundsheimensis, Serbia
    ... sive crochet. The protocone, characterised by a pronounced constriction, appears remarkably bul- bous. Unfortunately, the hypocone has been bro- ken off. The enamel surface presents several vertical and subvertical brown lines. The cingulum can be seen on the preserved mesial side. Lower dentition: The ...
    ... Kučај zone (Dimitrijević, 1997) in the central part of the Carpatho-Balkanides. This approximately 1,200 m thick succession of pre- dominantly shallow-water limestones dips steeply (~45°) towards the east (Veselinović et al., 1964). The older Paleozoic clastics, which underlie these karstified limestones ...
    ... collected in 1998 at the entrance to the cave where it was probably transported by a temporary cave stream, which is known to be active during high water periods (Pušić and Steva- nović, 1994; Dokmanovic et al., 2003; Milanović, 2015). Although the primary geological context of the fossils could not be ...

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... method was used. Dialysis bag (cellulose membrane MW cut-off 12000, Sigma-Aldrich, St. Louis, MO, USA) was filled with 2 mL of nanocrystal dispersion (F5, F6 or F8), corresponding suspension (S5, S6, or S8), or coarse DK-I-60-3 suspension in water and immersed in 200 mL of dissolution medium (water:isopropanol ...
    ... Scientific, Loughborough, UK). Fresh ultrapure water was supplied from a TKA GenPure system (TKA Wasseranfbereitungssysteme GmbH, Neiderelbert, Germany). 2.2. Methods 2.2.1. Preformulation Studies Solubility of DK-I-60-3 Solubility of DK-I-60-3 in distilled water, 0.1 M hydrochloride acid, phosphate buffer ...
    ... samples were diluted in ultra-purified water (1:100, v/v). Zeta Potential Measurements The zeta potential (ZP) of obtained nanocrystal dispersions was determined by Zeta- sizer Nano ZS90 (Malvern Instruments Ltd., Worcestershire, U.K.) after dilution in ultrapure water (conductivity 50 µS/cm) 1:100 (v/v) ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • 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
    ... function of the formation volume factor, the oil formation volume factor Bo (m*/m*), and the water formation volume factor Bw (m?/m?): qo+qw 32 n qoBo+qwBw — qo - oil production, (m*/m*) — qw- water production, (m?/m?) If all the gas passes through the pump, the volumetric efficiency increases ...
    ... pressure falls below the intake pressure. When the intake pressure exceeds the pressure inside the cylinder, the ball on the standing valve lifts off the standing, valve. At this point, the fluid from the well enters the cylinder through the standing valve and fills the space, causing the plunger ...
    ... conducted under a specific minimal pressure regulated by a choke valve, which allows gas to enter the oil pipeline but prevents the backflow of oil and water into the annular space between the casing and tubing. This ensures that the pressure in the casing is slightly higher than the pressure in the oil ...

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... nominal available power quantity (kW); H the specific heat of water (constant, 4.2 kJ/kg/◦C); Q the yield of the source (kg/s, for water the same as l/s); and ∆T denotes the temperature difference between the entering water and the leaving water. Geothermal systems on the both sites perform heating operations ...
    ... B—indicates that the geothermal water is enriched by sodium and may come from sedimentary terrains; C—is low, which excludes water deriving from a flysch, volcanite or schistose basement; D—indicates water circulation through dolomite; E— indicates that geothermal water had circulated in a carbonated ...
    ... B—indicates that this geothermal water, highly rich in sodium, may have come from sedimentary terrain; C—indicates that the geothermal water may have circulated through flysch sediments; D—excludes water circulations through dolomite; E— indicates the geothermal water had circulated in a sulfated reservoir ...

  • Structural and geochronological constraints from the Drina-Ivanjica thrust sheet (Western Serbia): implications for the Cretaceous–Paleogene tectonics of the Internal Dinarides

    Kristof Porkoláb, Szilvia Kövér, Zsolt Benkó, Gabor Héja, Melinda Fialowski, Balázs Soós, Nataša Gerzina Spajić, Nevenka Đerić, László Fodor (2019)
    Internal Dinarides, Drina-Ivanjica thrust sheet, Deformation history, K–Ar dating, Obduction, Structural analysis
    ... in a deep basin formed ahead of advancing ophiolitic thrust sheet that comprises blocks of various size and lithology; and (2) material scraped off from the footwall of the ophiolite thrust (Adriatic units) (Bortolotti et al. 1996; Chiari et al. 2011). WNW-ESE trending.stretching lin- eations ...

  • Примена ПСП пумпи за експлоатацију вискозних флуида

    Алекса Трифуновић (2024)
    Производња парафинске нафте се током историје одвијала уз помоћ дубниских клипних пумпи, све до појаве ПСП система који су показали боље каратеристике и већу ефикасност. Функционални дизајн пумпе омогућава производњу вискозних и абразивних мултифазних флуида, уз ниска капитална улагања. У раду је анализирана проблематика рада укључују губитке протока флуида, производњу песка, оштећење клипних шипки и тубинга и сам притисак на дну бушотине. Рађена је студија случаја за нафно лежиште „М“ у коме је приказан цео производни век почевши од ...
    парафинска нафта, систем ПСП, производња нафте, студија случаја
    ... ecHeKTpOMOTOpa OJ TIpoliynTaFba JHe)KHITHOT (biryH)a H KOMIICH3y]JC TOTHIJIOTHO IIIHpcM>e yJba H HPb:6TOBy HOTPOITIHy. Oo0yxBaTHu BenHTu. (eHr. Blow Off Preventer - iBOP) – npejicranpjba neo epynmmoHor ypebaja. CunyxH a aarBapabe OymroTuHHe y cayryuajy noTpeOe 3a cepBHcHpaMbeM moroHcKor ypebaja, canHKa ...

  • Избор одговарајуће механичке методе

    Анастасија Мирјанић (2024)
    Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина

  • 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
    ... and lexical databases with accentuated word forms. Serbian speech recognition and generation has been commer- cialised by the AlfaNum company, a spin-off of theUni- versity of Novi Sad. e AlfaNum company has a con- siderable number of users among Serbian companies. e first corpus of contemporary Serbian ...
    ... environments in which manuals and other docu- mentation are written to special standards for complex IT, healthcare, engineering and other products. To off- set customer complaints about incorrect use and dam- age claims resulting from poorly understood instruc- tions, companies are increasingly focusing ...
    ... ASR have been developed based on these resources. Serbian speech recognition and generation has been commer- cialised by the AlfaNum company, a spin-off of theUni- versity of Novi Sad. is company is successfully con- ducting business activities in other countries of the for- mer Yugoslavia as well (Croatia ...

  • Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije

    Marina D. Ćuk (2018-02-23)
    Osnovni cilj doktorske disertacije predstavljao je definisanje prirodnih koncentracija (engl. background values) U, Th, i K u podzemnim vodama, i definisanje hidrogeohemijskih uslova koji utiču na distribuciju navedenih elemenata u podzemnim vodama...
    prirodni radioaktivni elementi, podzemna voda, geohemijske sredine, hidrogeohemijski uslovi, neparametarska statistička analiza, logistički model, hidrohemijsko modeliranje
    ... (ISO/TC 147). 73. ISO 9697. Water Quality – Measurement of Gross Beta Activity in Non-saline Water; 1992 (ISO/TC 147). 74. Janičić B, Novović Z. 2011. Procena uspešnosti u klasifikovanju rezultata na osnovu graničnih (cut-off) skorova: Receiver operating characteristic curve. Primenjena psihologija ...
    ... T. 1988. Estimation of descriptive statistics for multiply censored water quality data. Water Resources Research 24 (12): 1997-2004. 58. Helsel DR, Hirsch RM. 2002. Statistical Methods in Water Resources. Techniques of Water-Resources Investigations of the United States Geological Survey. Hydrologic ...
    ... cija koja pronalazi najbolju graničnu vrednost (engl. cut-off vrednost) između senzitivnosti (Se) i specifičnosti (Sp) za binarno kodiranu varijablu (Slika 9.1.) (Faraggi and Reiser 2002). Idealno, najbolja granična vrednost (cut- off) omogućava najvišu specifičnost i senzitivnost u isto vreme, ...

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje