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Упит dcterms_subject_txt:Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

2352 items

  • Konceptualni model hidrogeotermalnog sistema šire okoline Brusa - geotermalna karakterizacija sistema / Conceptual model of hydrothermal system of Brus area - system geothermal characterization

    Dejan Milenić, Ana Vranješ, Marinko Toljić, Ivana Vasiljević, Natalija Radosavljević, Matija Ognjanović (2024)
    Postavljeni konceptualni model hidrogeotermalnog sistema Brusa sa širom okolinom testiran je primenom različitih hidrohemijskih i izotopskih metoda u cilju njegove verifikacije i karakterizacije. Rezultati su ukazali na atomsfersko poreklo geotermalnih fluida i na razviće primarnih rezervoara u okviru karbonatnih stena. Prvi rezervoar formiran je u okviru krečnjaka gornjotrijakse starosti, dok drugi rezervoar egzistira u okviru trijskaih mermera. Zone prihranjivanja locirane su u zapadnom delu terena. Sistemi gravitacionih raseda kontrolišu kretanje fluida u sistemu, dok proces jonske izmene dominira u ...
    hidrogeotermalni sistem, hidrohemijske i izotopske metode, mladi intruzivi

  • 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
    ... operation Frequent changes in pump operation and fluid composition lead to variations in the load and energy consumption of the system. Based on the physical characteristics of the well and measured values of load and smooth rod stroke, theoretical and surface dynamograms are generated. Mathematical ...
    ... application of machine learning is beneficial and can enhance diagnostics and management in rod pump systems. 6.3. Application of methods and materials The oil and gas industry must reduce costs and improve operational efficiency by leveraging data and investing in new technology to increase pr ...
    ... load and the stroke of the smooth rod. In most cases, the operation of the downhole pump is monitored by recording surface dynamograms, while in the case of a system for recording time functions of stroke and load, downhole dynamograms are generated using a mathematical model. Theoretical dynamograms ...

  • Минерагенија зеолитских туфова Србије

    Vladan Kašić (2018-02-05)
    Лежишта наших зеолитских туфова (Златокоп, Игрош, Јабланица 1, Беочин, Топоница и Сланци) која су овде била предмет детаљних истраживања, просторно и генетски везана су за вулканске и вулканокластичне стене маринских средина сенонске и неогенске старости и језерске седименте неогене старости и настала су као продукт девитрификације вулканског стакла.Током лабораторијских испитивања при изради ове докторске дисертације, примењене су следеће аналитичке методе: оптичка испитивања петрографских препарата; рендгенска дифракција праха (XRD); скенирајућа електронска микроскопија (СЕМ метода); хемијска карактеризација зеолитских туфова у оквиру ...
    минерагенија, зеолитски туф, Србија, клиноптилолит, хојландит
    ... Montero L. A., (1998): Theoretical study of the physical adsorption of aspirin on natural clinoptilolite. Microporous and Mesoporous Materials 23(5-6), 247-252. Langella, A., Cappelletti, P., de’ Gennaro R., (2001): Zeolites in Closed Hydrologic Systems. Reviews in Mineralogy and Geochemistry, 45, 1 ...
    ... П-838/00. Tomašević-Čanović M., Stanić T., Živanović A., Lemić J., (2004), 7th Intern. Conf. on Fundam. and Appl. Aspects of Physical Chemistry, Beograd, Removal of arsenate by cationic surfactant and iron hydroxide-loaded natural clinoptilolite, Vol. II, 2004, 751-753. Farkaš A., Cerjan-StefanovićŠ ...
    ... (Ed. by Gee D. and Stephenson R.) Geological Society of London Memoir 32, 191–206. Huddleston R.G., (1990): Hydrology. Open File Report No. H90-8, New Mexico Institute of Mining and Technology, Soccoro, NM. Huggerty G.M., Bowman R.S., (1994): Sorption of chromate and other inorganic anions by ...

  • 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
    ... access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:/ / creativecommons.org//licenses/by/ 4.0/). Department of Chemistry, University of Belgrade-Institute of Chemistry, Technology and Metallurgy, Njegoševa 12, 11000 Belgrrade, ...
    ... which are materials that display ferromagnetism and ferroelectricity simultaneously [5-9]. The perovskite compounds are one of the most promising, types of magnetoelectric multiferroics [10-14]. The advantages of these novel materials can support the development of advanced devices and technologies ...
    ... D.; Ksenevich, V.; Bychanok, D.; Selskis, A.; uzhir, P.; et al.: The Phosphate-Based Composite Materials Filled with Nano-Sized BaTiOy and Fes3Oux: Toward the Unfired Multiferroic Materials. Materials 2021, 14, 133. [CrossRef] [PubMed] Omelyanchik, A.; Antipova, V.; Gritsenko, C.; Kolesnikova, V ...

  • Грешка инклинације код депозиционе реманетне магнетизације

    Mirko Petković, Vesna Cvetkov (2019)
    ... particles, and correct for paleomagnetic inclination shallowing, Physics and Chemistry of the Earth 27, 1273 – 1279. 5. Jackson, M., Banerjee, S., Marvin, J., Lu, R., & Gruber, W., (1991) Detrital remanence, inclination errors, and anhysteretic remanence anisotropy: quantitative model and experimental ...
    ... the aim of defining the spatial and temporal position of the investigated rock complexes. The spatial position of the remanent magnetization vector is determined by the paleo declination and inclination. However, the processes of re-deposition, compaction and cementation of sediments lead to the ...
    ... formation, the so-called inclination error. Sometimes this error is negligible, sometimes it is significant and can cause wrongly defined paleolatitude of deposition, the magnitude of translational and rotational movement of blocks, as well as non-matching of magnetostratigraphic scales. Experimental ...

  • Sastav i teksture minerala FeO-Fe2O3-TiO2 sistema u vulkanskim stenama i porfirskim ležištima bakra Borske metalogenetske zone

    Aleksandar Luković (2021)
    Proces obrazovanja minerala iz sistema FeO-Fe2O3-TiO2 u uzorcima vulkanskih stena i porfirskih orudnjenja borske zone prikazan kroz pojavu magnetita/hematita i njihovih alteracija. Minerali ove zone su ispitivani optičkim metodama (odbijena i propuštena svetlost), SEM-EDS/BSD, XRPD, LA-ICP-MS metodama. Rezultati ispitivanja su, pored glavnih Fe – Ti oksida, otkrili prisustvo ferijskog ilmenita u hornblenda andezitima I vulkanske faze kao i magnetita sa većim koncetracija Cr u zoni zlotske magnetne anomalije. Ispitivanje uzoraka iz bušotina porfirskih sistema borske zone otkriva postojanje nekoliko ...
    magnetit, hematit, hemoilmenit, Borska metalogenetska zona, porfirska ležišta
    ... C., (1951): Neutron Scattering and Polarization by Ferromagnetic Materials. Physical Review, 84(5), 912–921. Sievwright, R. H., Wilkinson, J. J., O’Neill, H. S. C., & Berry, A. J., (2017): Thermodynamic controls on element partitioning between titanomagnetite and andesitic–dacitic silicate melts ...
    ... Lindsley, D.H., & Prewitt, C.T., (1984): Crystal stucture and cation distribution in titanomagnetites (Fe3-xTixO4). American Mineralogist, 69, 754-770. Whalen, J.B., & Chappell, B .W., (1988): Opaque mineralogy and mafic mineral chemistry of I- and S-type granites of the Lachlan Fold belt, southeast Australia ...
    ... 457–475. Mücke, A., Raphael Cabral, A., (2005): Redox and nonredox reactions of magnetite and hematite in rocks. Chem. Erde Geochem., 65, 271–278. Nadoll, P., & Koenig, A. E., (2011): LA-ICP-MS of magnetite: methods and reference materials. Journal of Analytical Atomic Spectrometry, 26(9), 1872 ...

  • Multi-elemental analysis of real water samples from the Požega area, Serbia

    Nebojša Pantelić, Jana Štrbački, Ivana Maloparac, Nikola Tomašević, Biljana Dojčinović, Aleksandar Kostić (2022)
    Cilj ovog rada bio je ispitivanje kvaliteta realnih uzoraka vode za piće, prikupljenih sa teritorije grada Požege i okolnih seoskih naselja. Za određivanje koncentracije makro i mikroelemenata u uzorcima vode korišćena je analitička tehnika induktivno kuplovana plazma sa optičkom emisionom spektrometrijom, ICP-OES. Dobijeni rezultati upoređivani su sa maksimalno dozvoljenim kocentracijama elemenata propisanim nacionalnim Pravilnikom o higijenskoj ispravnosti vode za piće, kao i preporukama Svetske zdravstvene organizacije (WHO) i Američke agencije za zaštitu životne sredine (EPA). Analizirane vode su malomineralizovane ...
    General Materials Science

  • Low-temperature phase transition and magnetic properties of K3YbSi2O7

    Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica
    ... Geology, Ðušina 7, Belgrade, 11000, Serbia, bInstitute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, Innsbruck, A-6020, Austria, cDepartment of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, Novi Sad, 21000 ...
    ... momentum on the direction of the magnetic field. 1. Introduction Awide range of optical and magnetic properties of rare-earth elements (REE), their alloys and compounds makes them very interesting materials for different applications. In recent decades, many studies have been performed on REE-bearing ...
    ... Nikolić, M. G., Kovač, S. & Kremenović, A. (2019). Acta Cryst. C75, 1417–1423. Felsche, J. (1973). The Crystal Chemistry of the Rare-Earth Silicates. In Rare Earths. Structure and Bonding, Vol. 13. Berlin, Heidelberg: Springer. Figueiredo, B. R., Valente, A. A., Lin, Z. & Silva, C. M. (2016). ...

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... assessing underground hazard, in: Rockbursts and Seismicity in Mines (N.C. Gay and E.H. Wainwright, eds.), South African Institute of Mining and Metallurgy, Johannesburg, Symposium Series No. 6, pp. 199-208, Burridge, R., and Knopoff, L. Model and theoretical seismicity, Bulletin of Seismological ...
    ... delay for the analysis of chaotic time series, Physical Letters A 142, 107-111. 102.Lise, S. Paczuski, M. 2001. Self-organized criticality and universality in a nonconservative earthquake model, Physical Review E 63, 036111-1-5. 103.Lorig, L., and Hobbs, B. 1990. Numerical modeling of slip instability ...
    ... 163.Scholz, C.H. 1998. Earthquakes and friction laws, Nature 391, 37-42. 164.Schreiber, T. 1997. Detecting and analyzing nonstationarity in a time series with nonlinear cross-predictions. Physical Review Letters 78, 843-846. 165.Sibson, R.H. 1977. Fault rocks and fault mechanisms, Journal of the ...

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... assessing underground hazard, in: Rockbursts and Seismicity in Mines (N.C. Gay and E.H. Wainwright, eds.), South African Institute of Mining and Metallurgy, Johannesburg, Symposium Series No. 6, pp. 199-208, Burridge, R., and Knopoff, L. Model and theoretical seismicity, Bulletin of Seismological ...
    ... delay for the analysis of chaotic time series, Physical Letters A 142, 107-111. 102.Lise, S. Paczuski, M. 2001. Self-organized criticality and universality in a nonconservative earthquake model, Physical Review E 63, 036111-1-5. 103.Lorig, L., and Hobbs, B. 1990. Numerical modeling of slip instability ...
    ... 163.Scholz, C.H. 1998. Earthquakes and friction laws, Nature 391, 37-42. 164.Schreiber, T. 1997. Detecting and analyzing nonstationarity in a time series with nonlinear cross-predictions. Physical Review Letters 78, 843-846. 165.Sibson, R.H. 1977. Fault rocks and fault mechanisms, Journal of the ...

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... natural stone slabs for architectural cladding and paving for exterior and interior use. With the actual national standards for natural stone products, designers and investors have lost the usability reference in evaluating stone quality. The theoretical contribution of previous studies delivers ...
    ... suitable size) and market demand (Luodes et al. 2000). Despite the fact that concrete and glass were the prin- cipal materials in architectural design during the 1970s and 1980s, in the last three decades, the demand for dimension stone has continuously increased (Siegesmund and Sneth- lage ...
    ... area of approximately 0.12 km? (Živković and Paunović 2000). Materials and methods Carbonate rocks collected from four different locations in Serbia (quarries: Klisura, Skrzut, Struganik, and Tisnica) have been used to characterize the petrographic and tech- nical properties of dimension stone ...

  • Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4

    Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)
    In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...

  • 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
    ... cement in the production of mortars and concrete are performed in accordance with certain standards, and the detailed physical–mechanical and physical–chemical characterization of mortar and concrete is carried out. Minerals 2021, 11, 925 3 of 16 2. Materials and Methods 2.1. Sampling The waste slag ...
    ... concluded that, in mortar and concrete production, cement could be replaced by waste material by up to 20%. Additionally, results of the physical–mechanical characterization showed that mortar and concrete materials with 20% of cement replacement may be used as constructional materials in the construction ...
    ... combustion of lignite and taken from the Valjevo landfill in Serbia, may, despite being hazardous waste, be used in combination with silica fumes as a partial replacement for cement in the production of mortar and concrete as materials in the construction industry. Results of the physical–mechanical chara ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... refinements of tremolite at 140 and 295 K: Crystal chemistry and petrologic implications. Am. Mineral. 1996, 81, 1117–1125. [CrossRef] Gatta, D.G.; Merlini, M.; Valdrč, G.; Liermann, H.-P.; Nenert, G.; Rothkirch, A.; Kahlenberg, V.; Pavese, A. On the crystal structure and compressional behavior of talc: ...
    ... How to conciliate antagonist physical and chemical requirements. Ann. Chim. Sci. Materiaux 2005, 30, 673–688. [CrossRef] Hulthen, B. On ceramic ware in northern scandinavia during the neolithic, bronze, and early iron Age: A ceramic-ecological study. In Archaeology and Environment Series (e-book) ...
    ... ceramic gives rise to a brittle edge, and fracture initiation depends upon the defects and their distribution in the matrix. It is thus difficult to design the shape and mechanical strength of a ceramic object. However, the association of two brittle materials, i.e., a composite material, can give ...

  • Опасности и штетности код производње текстилних компоненти за моторна возила

    Мара Павловић (2024)
    Рад се заснива на препознавању опасности и штетности којим су изложени запослени у једном привредном друштву чија је делатност производња звучне и топлотне изолација и заштите од вибрација за моторна возила. Ради истраживања и реализације постављених циљева, завршни рад је структуиран у три целине. У првом делу рада описан је технолошки процес и карактеристике материјала при производњи изолационих материјала од текстилног отпада и производњи полиуретанске пене. У оквиру другог дела описане су опасности и штетности којим су изложени запослени при обављању својих ...
    опасности, штетности, превентивне мере
    ... 3a MomopHa 603u.la KparyJjepBati, HoBeM0Oap 2021. ronane Polyol Resin Blends Safety and Handling Guidelines American Chemistry Council deOpyap 2022. romanHe Guidance for Working with MDI American Chemistry Council deOpyap 2022. romanHe 4nanusa emu.nen Ouqdpenun 0uusouujanama (MDI) www.laboratuar ...
    ... слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.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 ...

  • The Flow Conditions in the Epikarst Zone of a Karst Aquifer. Case Study: Suva planina Mt., East Serbia

    Branislav Petrović (2023)
    The epikarst as a part of the karst aquifer represents a complex point of contact and mixing of unconsolidated material from the terrain surface, carbonate rocks altered by “corrosive” water, flora and fauna (and remains of), which is partially saturated with groundwater. Significant amounts of (plant accessible) water, and other solutes and particles, can be stored in this zone for extended periods of time. Thus, attenuation or biochemical processes could start in this layer and change quality of infiltrated ...
    epikarst, tracer test, shallow cave, Suva Planina Mt., Serbia

  • 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
    ... actor in pipe. Industrial and  Engineering Chemistry Fundamentals 18(3), 296–297. (на енглеском)  ‐ 188 ‐ Дејан Бркић, Докторска дисертација      68. Chen, N.H. 1980. Comments on “An explicit equation for friction factor in pipes”.  Industrial and Engineering Chemistry Fundamentals 19(2), 229–230 ...
    ... for turbulent flow friction factor calculation. Industrial and Engineering Chemistry  Research 46(8), 2593‐2600. (на енглеском)  262. Spriggs, H.D. 1973. Comments on transition from laminar to turbulent flow. Industrial  and Engineering Chemistry 12(3), 286‐290. (на енглеском)  263. Spriggs, H.D. 1973 ...
    ... ebrook equation. Industrial and  Engineering Chemistry Research 48(7), 3665–3671. (на енглеском)  76. Coelho, P.M., Pinho, C. 2007. Considerations about equations for steady state flow in  natural gas pipelines. Journal of the Brazilian Society of Mechanical Sciences and  Engineering 29(3), 262‐273 ...

  • 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
    ... actor in pipe. Industrial and  Engineering Chemistry Fundamentals 18(3), 296–297. (на енглеском)  ‐ 188 ‐ Дејан Бркић, Докторска дисертација      68. Chen, N.H. 1980. Comments on “An explicit equation for friction factor in pipes”.  Industrial and Engineering Chemistry Fundamentals 19(2), 229–230 ...
    ... for turbulent flow friction factor calculation. Industrial and Engineering Chemistry  Research 46(8), 2593‐2600. (на енглеском)  262. Spriggs, H.D. 1973. Comments on transition from laminar to turbulent flow. Industrial  and Engineering Chemistry 12(3), 286‐290. (на енглеском)  263. Spriggs, H.D. 1973 ...
    ... ebrook equation. Industrial and  Engineering Chemistry Research 48(7), 3665–3671. (на енглеском)  76. Coelho, P.M., Pinho, C. 2007. Considerations about equations for steady state flow in  natural gas pipelines. Journal of the Brazilian Society of Mechanical Sciences and  Engineering 29(3), 262‐273 ...

  • 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
    ... resulting in a growing number and availability of learning materials, had a strong impact on changes in learning environments. New learning environments are needed, requiring appropriate technology to facilitate access to and management of learning materials in specific domains. Bearing ...
    ... practice. The process is based on clustering, categorizing and defining mathematical concepts from the base of relevant engineering problems. Figure 3. MLES application 3. GOALS AND CHALLENGES Searching and processing mathematical materials is a complex problem. Standard text processors cannot ...
    ... Search Engine. Journal of Theoretical and Applied Information Technology, 4 (10), pp. 1002-1012. [9] Mišutka, J., Galamboš, L., (2008). Extending Full Text Search Engine for Mathematical. Proceedings of Towards Digital Mathematics Library, pp. 55-67. IT Education and Practice Radojičić et al ...