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Упит dcterms_subject_txt:deep well pump

946 items

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... pressure method. For testing, an apparatus was used which consisted of a metal cylindrical vessel with a capacity of 8 dm3 and a special lid with a pump and manometer. The density of hardened concrete (water-saturated) was determined according to standard EN 12390-7 on the samples shaped like cubes ...
    ... were firstly dried at a temperature of 60 ± 5 ◦C to the constant mass (M0). Then the surface of the prism failure was set on the linear supports in a deep vessel, where water was poured so that the prism was immersed by 5 to 10 mm. Prior to the immersion, the mass of the dry sample was measured, and after ...
    ... 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 minerals Article Application of Lignite Combustion Waste ...

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... dependence measurements pellets were placed in a vacuum chamber with a cold head and capacitor cell mounted on it. Pfeiffer vacuum turbo molec- ular pump maintained 104 mbar pressure. CTI Cryogenics refrigerating system model 22 mounted on the cold head was applied to a lower temperature to 150 K. Lakeshore ...
    ... 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 A inorganics Article BaTiOx/Ni„Zni _x„Fe>Ou (x = 0, 0.5 ...
    ... varying, the microstructure of their constituents, their volume fraction, and/or the phase composition [28,29]. Barium titanate (BaTiOx) is a well-known compound used to develop magnetoelectric muhltiferroic materials. This is due to its unique dielectric properties in the tetragonal phase ...

  • 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
    ... napaQuHcka HaQa, cHcTeM IICII, nponaBoJuba HaQrre, crynja caryuaja Canp:xaj bA: ) OLAAA AAAAAA AAAAAA 4 1 AHama3a cHcreMa „Progressive cavity pump- PCP” a atateaaaaaaoNt 5 1.1 HauatH paanaaaaaaaa a aaaaaaeaaaaaaaaaaaaaaaaaeaaaaaeaaaaaaaaaaaaaaaaaaaaaaaaaott 5 NR AAAMi(;yco:10?(5aysi t; RAAAAAA ...
    ... yrHuy Ha eQ)MKacHocT H moy3naHocT IICII cacreMa y eKcnnoaranuju HaQe y KOMTIIJIČKCHHM TČCOJIOHIKHM yCJIOBHM4. 1 AHamu3a cucreMa „Progressive cavity pump- PCP” 1.1 „Hauu paa /lyOuHcka 3aBojHa rryMmna (PCP) ce cacroju oJi criipaztiHor ueamHuHor poTopa H craTopa HartpaBJbeHO OJ enacTOMepa KojH je ...
    ... IIpHMeHec (TeEXHO- ČKOHOMCKH c(bekTH), H3pabyje ce MaTeMaTHuKH MOJIĆJI H CHMyJanuja pajla OIIDeMe. V cknany ca craHnap/noM ISO 15136 „progressing cavity pump systems for artificial lift“, nryMme ce O3HauaBAaJy Ha ctexrchH HauHH: X EE ZZZZ Ivie je: X — osHaKa ra06apura IIyMIIe. EE – HoMuHajtHa IpoH3BORna ...

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... in Serbia are presented in Table 4. The favorable circumstance related to the Serbian energy sector and issue of intermittence is the existence of pump storage, and at least a few hundred MW of intermittent capacities can be connected without further investments (RS2, 2016). 3.2.2. Technical criterion ...
    ... the proposed economic, environmen- tal, socio-political, and technical criteria, as well as the as- sessment of available RES technologies in Serbia regarding the socio-political criterion. • The introduction of the well-known energy indicators (IPC, 2014; IRE, 2019; RS2, 2016) into the FAHP model to eval- ...
    ... 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 Please cite this article as: B. Pavlović, D. Ivezić andM. Živković ...

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... and kept in a freezer until analysis. The ion determination was performed on a Dionex ICS-3000 ion chro- matographic set-up consisting of a single pump, a conductivity detector (ASRS ULTRATI (4 mm), recycle mode), an eluent generator with a Chromeleon(R) Chromatography Workstation and Chromeleon ...
    ... ash content in SW500f as well as in BW550 and the dominant content of SIO> in the ash of HW500f. The leachate of ACI with high content of Al and Si has a particularly low EC value. The UV absorbance of acidified NaOH extracts at 250 nm (A»xso) is presumed to correlate well with aromatic dissolved ...
    ... (treated and untreated) for aromatic out-of-plain CH deformation [85,94] are well resolved and relatively strong and reflect the relatively large H/C ratio at con- comitant low O/C ratio. It also corresponds to the well-visible peak for aromatic CH stretch vibrations. The peak at 595 cm" (untreated) ...

  • Recycling of carbonates into the deep mantle beneath central Balkan Peninsula: Mg-Zn isotope evidence

    Zi-Tan Shu, Sheng-Ao Liu, Dejan Prelević, Vladica Cvetković, Shuguang Li (2022)
    Mg i Zn izotopi, ciklus ugljenika, natrijski alkalni bazalti, orogeni pojas Tetisa, Balkansko poluostrvo

  • Hydrodynamic analysis of radial collector well ageing at Belgrade well field

    Đorđije Božović, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković (2019)
    The origin and effect of hydraulic resistances on the rate of ageing of radial collector wells are identified through numerical hydrodynamic analysis. The research includes hydrodynamic modeling of one such well with new laterals at Belgrade well field. The performance of the laterals is aggravated by rapid ageing. The change in the hydraulic parameters of the laterals during the first decade of operation is analyzed through simulations of the groundwater regime with realistically specified geometries and hydraulics of the ...
    Colmation, Incrustation, Groundwater modeling, MODFLOW–USG, Connected Linear Network Process

  • The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)

    Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov (2019)
    Geography, Planning and Development,Aquatic Science,Biochemistry,Water Science and Technology
    ... observation well, as well as at the control gate (Figure 4). The decrease in the groundwater level at PP-3 during the measurement process (7 h) was ∆h = 7.49 m, which is indicative of intensive interaction of the water in the tunnel and the hydrogeologic environment within the zone of observation well PP-3 ...
    ... standard excavation (first and last parts) and tubing (1/4 and 3/4) with concrete lining (Figure 1). Three observation wells, PP-1, PP-3 and PP-4, were deep-drilled along the tunnel and the screens installed within the tunnel zone. The HPP has a gravity dam and is usually operated 4–5 h/day. Surface water ...
    ... 18 0.51 2.85 ∆S (m)/PP-3 3.18 43.03 42.14 2.85 However, despite the fact that the greatest changes were detected at observation well PP-3, a comparative analysis of that well and PP-1 indicated that the groundwater level largely depended on the operating regime of the tunnel. Parallel plots showed different ...

  • Introductory editorial - Special issue: Genesis and protection of groundwater in carbonate aquifer

    Saša Milanović (2019)
    Geochemistry and Petrology

  • Pregled hidrodinamičkih istraživanja bunara sa horizontalnim drenovima numeričkim metodama

    Đorđije Božović, Dušan Polomčić, Dragoljub Bajić (2020)
    U radu je predstavljen pregled odabranih hidrodinamičkih istraživanja realizovanih primenom numeričkih metoda simulacije kretanja podzemnih voda pod uticajem rada bunara sa horizontalnim drenovima. Na osnovu pristupa u matematičkom i hidrauličkom tretiranju, kao i numeričkoj simulaciji bunara sa horizontalnim drenovima na modelima, predstavljeni su najznačajniji aspekti izrade hidrodinamičkih modela ovog kompleksnog tipa vodozahvatnog objekta. Metodologija obuhvata izbor: a) graničnih uslova za simulaciju prirodnih granica, izvora prihranjivanja i dreniranja izdani; b) primenjivanog stepena diskretizacije prostora obuhvaćenog modelom u planu i profilu; ...
    horizontalni bunari, hidraulika bunara, analitički modeli, numerički modeli, hidrodinamičko modeliranje podzemnih voda

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... visualization of geophysical well-logging data from closely spaced boreholes Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Analysis and visualization of geophysical well-logging data from closely ...
    ... 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 ...
    ... econosaare Ha PenyOnka CeBepHa MakcJuoHuja Fifth Congress of Geologists of the Republic of North Macedonia ANALYSIS AND VISUALIZATION OF GEOPHYSICAL WELL- LOGGING DATA FROM CLOSELY SPACED BOREHOLES IBranislav Sretković, !'Iyvana Vasiljević, IDimitry Sidorov - Biryukov 1University of Belgrade - Faculty ...

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... data include: basic data, hydrogeology, biology, geology and mining as well as specific information related to the terrain of abandoned mines [7]. Spatial data in the aforementioned study on terrain of abandoned mines as well as data concerning the remediation of this terrain were generally available ...
    ... landfills within the mining waste field, as well as other data related to the management of mining waste. In the cadastre of abandoned mines and mining facilities data on the position and status of those mines and mine facilities are entered, as well as data on implemented measures for remediation ...
    ... average bench heights, the overall depth of the pit, volume, as well as general data collected during the field visit related to recultivation, water level (whether the mine is above, below, or above and below water level), as well as the site, for example, a pit, a landfill, workshop or plant. ...

  • 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

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... hydrodynamic model, well discharges at Šumice were registered every seven days during the period from January 1 to December 31 (Table 2). Figure 7 shows individual well discharges recorded at Šumice during the one-year period. Figure 7. Registered individual well discharges, January ...
    ... Committee, Belgrade, pp 259-266, 2013. 9. Mastilović Čoporda, T., Radojević, U., Vakanjac, B., Sorajić, S., Groundwater Quality analysis of the Deep Aquifer in Kikinda, Serbia, Proceedings of the 11th International Multidisciplinary Scientific Geoconference, Alabena, Bulgaria, 20-25 June, 2011 ...
    ... 3, 469-475, 1995, http://dx.doi.org/10.1111/j.1745-6584.1995.tb00303.x 26. Babac, D., Study on the Analysis of the Local Water Resources of the Deep Aquifer of the “Šumice” Water Source in Kikinda, the Aspect of Quality and Quantity and the Definition of Exploitation Conditions for the period ...

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... Belgrade Human Language Technology group for several decades [1], as well as a newly developed glossary, Termi. The system is aimed at providing for enrichment of these resources with terms from the mathematical vocabulary, as well as offering support in understanding and solving some real life ...
    ... areas of Mathematics as well as 212 lecture notes. Special attention was paid to the validity of content. For the purposes of lexical processing the entire corpus is converted to textual format. As the documents were in different alphabets and encodings, as well as in different formats, a ...
    ... lexical support. Within MLES various types of lexical resources are used as well as local grammars, with the aim to provide a comprehensive and searchable learning environment. Although the general lexica in Serbian is well covered, mathematical terminology needs further improvements. MLES presents ...

  • Cement sheath integrity control during well life

    Bošković Zvonimir, Čebašek Vladimir, Mitrović Vladimir, Stanić Slobodan (2010)

  • The revision of Quaternary stratigraphy of the Sombor and Subotica artesian well borehole profiles (Bačka, Vojvodina, Serbia)

    Gaudenyi Tivadar, Nenadić Draženko, Jovanović Mlađen, Stejić Petar (2018)

  • Tangential stress in the well in the casing-cement stone-formation system

    Čebašek Vladimir, Bošković Zvonimir, Mitrović Vladimir, Gojković Nebojša (2010)

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

    Emö Márton, Vesna Cvetkov, Martin Đaković, Vesna Lesić, Slobodan Radusinović (2021)
    ... , bauxites, Middle Eocene nummulitic limestones, transitional marls, andUpper Eocene flysch. It is thrusted over by the Budva zone characterized by deep water sedimentsof Triassic through Paleogene ages with tuffitic layers in the Ladinian. The uppermost unit is theHigh Karst zone developed in a carbonate ...
    ... acceptable results (two localities) or obtainedtheir remanence quite recently. The five flysch and transitional marl localities have well-definedAMS fabrics as well as paleomagnetic directions. The AMS fabrics must have been imprinted in aNE-SW oriented compressional strain field, which resulted in ...
    ... 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 EGU21-12596 https://doi.org/10.5194/egusphere-egu21-12596 EGU ...

  • Defining optimal radial collector well capacity in conditions of unfavourable groundwater chemical composition (case study of Belgrade groundwater source)

    Božović Đorđije, Polomčić Dušan, Bajić Dragoljub, Ratković Jelena (2018)