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Упит dcterms_subject_txt:Fluid Flow and Transfer Processes

2357 items

  • Efikasnost različitih tipova glina Srbije za adsorpciju metilen plavog

    Maja D. Milošević (2016-12-09)
    Adsorpciona efikasnost različitih uzoraka glina sa lokaliteta Srbije određenaje njihovim tretiranjem različitim koncentracijama rastvora metilen plavog (MP).Detaljna mineraloška karakterizacija ispitivanih glina i rezultati njihove interakcijesa rastvorima MP dobijeni su primenom optičkih, rendgenskih, hemijskih, DTA ispektroskopskih metoda.Na osnovu formiranja MP agregata u izmenljivim pozicijama i površiničestica gline, razlikuju se dva tipa glinovitih minerala: visoko naelektrisani(smektiti) i nisko naelektrisani (kaoliniti). Dimeri se stvaraju na naelektrisanimpovršinama, a granica njihovog razvoja omogućuje determinaciju mineralne vrste.Molekuli MP stoje pod uglom od 21.5o kada se ...
    minerali glina, metilen plavo, kristali metilen plavog, difuznarefleksija, adsorpcija, flokulacija, naelektrisanje slojeva
    ... I: Equilibrium and batch contact-time studies. J. Chem. Technol. Biotechnol. 32: 759 - 772 121 McKay G., Otterburn M.S and Sweeney A.G. 1980. The removal of colour from effluent using varios adsorbents — III. Silica: Rate processes. Water Res. 14: 15 - 20 McRae E.G. and Kasha M. 1964 ...
    ... Augenstein, Rosenberg and Mason (Eds.), Physical processes in radiation biology. Academic Press, New York. pp. 23 - 42 Meier L.P. and Kahr G. 1999. Determination of the Cation Exchange Capacity (CEC) of Clay Minerals Using the Complexes of Copper(II) Ion with Triethylenetetramine and Tetraethylenepentamine ...
    ... Mining Congress and Fair of Turkey, 1MCET2005, Izmir, Turkey, June 09 - 12. 2015 Slomkowski S., Alemán J.V., Gilbert R.G., Hess M., Horie K., Jones R.G., Kubisa P., Meisel I., Mormann W., Penczek S., and Stepto R.F.T. 2011. Terminology of polymers and polymerization processes in dispersed systems ...

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... aluminium at 396.152 nm and with a sample flow rate of 1 mL min '. Integration times were 1 per increment (.e., analysis time of 1 minute per sample). UYV absorbance measurements 'wV absorbance measurements of pepsin and haemo- globin samples, both in the absence and in the presence of ALP* ...
    ... TInfluence of 4F ions on bepsin and haemoglobin conformation UV studies. The pepsin-A! and haemoglobin-AP"* interactions were followed by UV spectra. The absorption spectra of pepsin and haemoglobin in the absence and presence of 1OmM Al are presented in Figures 5 A and B. It is obvious that the ...
    ... standard potassium bromide (KBr) pallet (the ratio between pepsin and KBr and pepsin – AP? and KBr were 1:100); the pallets of haemoglobin samples in KBr were prepared in the same manner. Infrared spectra between 4000 and 400cm ! obtained on a Specord 75 IR, Carl Zeiss in double-beam operation ...

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • A hundred years of Milutin Milanković's climate change theory - geological implications

    Dejan Radivojević (2020)
    Миланковићева теорија циклуса објављена пре сто година је најважнија теорија у наукама које проучавају климу и имала је велики утицај на дисциплине које се баве Земљом. Ипак, његов рад је чекао више од педесет година да би добио потврду. Може се рећи да Миланковићев рад највећи утицај на геологију има у изради астрономске временске скале, подршци хипотези континенталног дрифта и палеоклиматологији. Добри резултати примене астрономске временске скале на неогене седименте иницирали су примену ове методе у мезозојским и у последње ...
    циклостратиграфија, астономска временска скала, геолошка временска скала, климатске промене, континентални дрифт
    ... n rates spatially and temporary varies and depend on palaeoecological and palaeogeographic conditions. Generally, well-rounded and fine-grained sediments reflect calm and slow sed- imentation, while angular coarse-grai ned sediments are mostly related to short palaeotransport and fast sedimentation ...
    ... his brothers died from tuber- culosis at young age and besides his mother jeli - saveta and grandmother, his uncle vasilije Maučević took care of him and sisters. In 1889 he left to his uncle Paja Maučević to osijek where he went to Gymnasium and very soon became the best student even though before ...
    ... pri- vate teachers and governess. Since there was not electrotechnics at vienna Technological Institute (actually Technische Universität Wien) he went to civil engineering and graduated in 1902. He contin- ued his vienna studies and at age of 25 (on Decem- ber 12th, 1904) gained a PhD and become the first ...

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... NLP tools for Serbian and English (Subsect. 2.2) and 46 S. Beliga et al. used evaluation methodology (Subsect. 2.3). The description of the used parallel dataset for English and Serbian languages is in Sect. 3. Section 4 presents the results, while the concluding remarks and future plans are in Sect ...
    ... node and is then used in the procedure of keyword candidate ranking and extraction [8,9]. The node in/outselectivity and generalized in/out- selectivity values are calculated from a directed weighted network as the average weight distributed on the ingoing/outgoing links of the single node and used in ...
    ... text pre- processing is needed and includes the conversion of the input text to lowercase, the removal of misspelled symbols and lemmatization. In a similar way, we pre- processed the English text: converted to lowercase and stemmed using the Porter stemmer. Stemming and lemmatization are also needed ...

  • Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites

    Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)
    To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...
    Perovskite/spinel ceramics, Multiferroic, Sintering, Influence of synthesis method

  • High-resolution sequence stratigraphy of carbonates - theory and examples

    Jelena Stefanović, Dejan Radivojević (2020)
    Циљ рада је да кроз теоријски аспект и примере примене представи секвенциону стратиграфију високе резолуције карбонатних седимената. У том смислу први део се односи на појам и значење високе резолуције у секвенционој стратиграфији. Од временских и просторних скала које одговарају сеизмичким профилима у последњих двадесет година метода је нашла примену на скалама које одговарају бушотинским подацима или изданцима. Као најпогоднији седименти за овај тип истраживања су се показали карбонати јер су осетљиви на еустатичке промене, а основе секвенционе стратиграфије ...
    изданак, системска група, јура-креда, карбонатна платформа, плитководна средина
    ... BELKHEDIM, S., JAROCHOWSKA, E., BENHAMOU, M., NEMRA, A., RADOUANE, S. & MUNNECKE, A. 2019. Interplay of Autogenic and Allogenic Processes On the Formation of Shallow Carbonate Cycles in a Synrift Setting (Lower Pliensbachian, Traras Mountains, NW Algeria). Journal of Sedimentary Research. 89. pp.784-807 ...
    ... W. and ALLEN, G.P., 1999. Siliciclastic sequence stratigraphy: concepts and applications. Concepts in sedimentology and Paleontology, vol. 7. Society of Economic Paleontologists and Mineralogists (SEPM). 210. READ, J.F. 1995. Overview of carbonate platform sequences, cycle stratigraphy and reservoirs ...
    ... changes. In Serbia and neighboring countries, Mesozoic age carbonate platform sediments can be found in the orogenic belts of the Carpatho-Balkanids and Dinarides. Sequence stratigraphy research of these sediments in our area would enable regional and local correlations and could serve for pal ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... late-night wind energy to pump water uphill from the pits to a higher-elevation holding pond. During the day, when electricity demand goes up, the flow is reversed and energy captured in hydro turbines. According to this study, for every 100 megawatts used to pump the water upward during night, the plant generates ...
    ... login and activity information to identify responsibility for entered data and general system usage. 2.2.1. Stakeholder Data The application module dedicated to administration of data related to companies, institutions and organizations i.e., stakeholders and beneficiaries, in tabular and detailed ...
    ... for management of exploration and exploitation permits and works in the mineral resources field. GeolIEP represents a basis for archiving and efficient handling of vector, raster and related thematic alphanumeric content in one place, as well as efficient management and usage of mineral resources. ...

  • Regulacija nivoa tečne faze u vertikalnim separatorima

    Katarina Šoštarić (2024)
    Ovaj diplomski rad bavi se regulacijom nivoa tečne faze u vertikalnim separatorima u industriji nafte i gasa. U radu su istraženi različiti metodi merenja nivoa, uključujući plovke, ultrazvučne i radarske senzore. Radarski senzori su se pokazali kao najefikasniji u teškim radnim uslovima, zahvaljujući njihovoj visokoj preciznosti i pouzdanosti. Rad uključuje teoretski pregled metoda merenja nivoa, detaljno poređenje prednosti i nedostataka različitih senzora, kao i studiju slučaja implementacije radarskog senzora u vertikalnom separatoru. Analiza rezultata i preporuke za buduća istraživanja ...
    Merenje nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte i gasa
    ... Elsevier, 2005. 4. Prezentacija iz predmeta 'Metrologija i standardizacija, RGF, Univerzitet u Beogradu 5. Transactions In Measurement and Control, Vol. 4, Flow & Level Measurement, Omega.com website 6. Članak DDESIGN OF VERTICAL THREE-PHASE SEPARATORS WITH INTERNALS (MIST EXTRACTOR) SUPERVISOR ...
    ... za razdvajanje tečnih i gasnih faza iz smeše fluida. Ovi separatori funkcionišu na principu gravitacije, gde različite gustine fluida omogućavaju njihovo razdvajanje. Vertikalni separator se sastoji od cilindričnog rezervoara sa ulazom za smešu fluida i izlazima za tečnost i gas. Unutar separatora ...
    ... 3.7. Vibracione viljuške Vibracija viljuške ili šipke dovodi do komešanja fluida čiji se nivo meri - očitavanjem rezonantnih karakterisitika viljuške dolazi se do informacije da li je viljuška zaronjena ili ne u fluid. Moguće je podešavanje trenutka aktiviranja, pri maksimalnom ili minimalnom ...

  • Poređenje rezultata interferometrijske analize za zemljotrese na istočnom anatolijskom rasedu od 2020. i 2023. godine

    Dragan Živković (2024)
    Ovaj rad se bavi analizom površinskih deformacija izazvanih zemljotresima u Turskoj iz 2020. i 2023. godine korišćenjem diferencijalne satelitske radarske interferometrije (DInSAR tehnike). Cilj istraživanja bio je da se kvantifikuju i uporede deformacije terena izazvane ovim seizmičkim događajima i da se razumeju mehanizmi koji stoje iza oslobađanja seizmičke energije u regionu. Analizom DInSAR snimaka, identifikovane su različite deformacije duž rasednih zona za svaki zemljotres. Dok je zemljotres iz 2020. godine (M 6,7) izazvao lokalizovane deformacije duž Istočno anatolijskog raseda, zemljotres ...
    DInSAR, Istočno anatolijski rased, Kahramanmaraški trostruki spoj

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... Introduction to Information Retrieval, vol. 1. Cambridge University Press, Cambridge (2008) 15. Martinović, M.: Transfer of natural language processing technology: experiments, possibilities and limitations case study: English to Serbian. INFOtheca 9(1–2), 11a–21a (2008) 16. Maurel, D., Friburger, N., ...
    ... style, both city and country names must be present in the affiliations. Accordingly, we have inserted the city and country names in affiliations “1 and 2”. Please check and confirm if the inserted city and coun- try names are correct. If not, please provide us with the correct city and country names ...
    ... resource is selected as one facet and the words lignit ‘lignite’ and ugalj ‘coal’ are defined for keyword search, and the system will search for any of these two words in appropriate fields. The second facet is location, and the corresponding keyword is Tamnava. This query and the docu- ments retrieved are ...

  • Contribution to the geotechnical classification of municipal waste landfills in Serbia

    Dragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić (2018)
    Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental Engineering

  • Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera

    Aleksandra B. Kolarski (2016-08-25)
    Radio talasi vrlo niskih frekvencija VLF (eng. Very Low Frequency) frekventnog opsega od 3 do 30 kHz, koji se prostiru talasovodom Zemlja-jonosfera (50 -90 km) su, kao što je poznato, efikasni i nezamenljivi u osmatranju pojava u niskoj jonosferi, sa tla...
    prostiranje talasa vrlo niskih frekvencija, talasovod Zemlja-jonosfera, globalno električno kolo, atmosfersko električno pražnjenje, kratkotrajne svetlosne pojave
    ... circuit and climate. Surv. Geophys., 25, pp. 441-484. Harrison, R. G., Carslaw, K. S. (2003). Ion-aerosol-cloud processes in the lower atmosphere, Rev. Geophys., 41, doi:10.1029/2002RG000114. Heavner, M. J., Sentman, D. D., Moudry, D. R., Wescott, E. M. (2000). Sprites, blue jets, and elves: ...
    ... A., Mika, A., Soula, S., Haldoupis, C., Neubert, T., Inan, U. S. (2006). Observations of the relationship between sprite morphology and in-cloud lightning processes, J. Geophys. Res., 111(D15203), doi:10.1029/2005JD006879. Vaughan Jr., O. H., Blakeslee, R., Boeck, W. L., Vonnegut, B., Brook, M. ...
    ... halos and elves) and LEP (Lightning-induced Electron precipitation) events were identified by their signatures on VLF perturbations. On the basis of the sprite event registration time from I.M.T.N. (with 0.001 - 0.1 s resolution) and in coincidence with the lightning discharge time (WWLLN and EUCLID ...

  • 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
    ... can cause massive problems in the processes of crushing and screening rock mass. The risk of this type of failure can be easily reduced by installing an additional fuel filter. A similar situation can occur from a broken screw in the mill lining. The purchase and installation of screws of adequate ...
    ... Theories for Risk Assessments Fuzzy set theory represents a mathematical approach that is suitable for the analysis of processes in which uncertainty, ambiguity, subjectivity, and indeterminacy are prevalent. It was developed to treat insufficiently precise phenomena that cannot be modeled solely using ...
    ... employees, and environment, even with proper monitoring and maintenance systems. Previous research in the field of risk and reliability has offered different approaches and various models, but there have been some common goals: the identification of critical elements in the system, subsystems, and assemblies; ...

  • Површинско распадање керсантита из Тешића мајдана у корелацији са начином обраде на примеру малог степеништа (Београдска тврђава)

    Невенка Новаковић (2024)
    Архитектуру Београда на прелазу 19. у 20. век обележила је употреба керсантита из каменолома Тешића мајдана. Kao камен високих декоративних својстава, керсантит је коришћен за јавне споменике, делове или потпуну изградњу објеката (Народна скупштина Србије, Мало степениште, Народни музеј и др.). Како очување споменика културе изискује познавање својстава уграђеног камена, истраживања су обухватила детаљно проучавање петролошких, хемијских и физичких карактеристика керсантита из Тешића мајданa и узорака камена из споменика Мало степениште (студија случаја). Након детаљног мапирања стања керсантита, лабораторијских ...
    керсантит, Мало степениште, споменик културе, архитектонски камен, физичко-хемијско распадање, мапирање, форме распадања, површинска обрада

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... interest – Instances (individual entities) – relations between these entities – Properties and the values of properties of these entities – Functions and processes that these entities are included in – constraints and rules that refer to these en- tities Therefore, an ontology can be viewed formal ...
    ... clearly and unequivocally determined, namely, defined and that only then it can have a commu- nications role; • analytical requirements of comparison, correlation, grouping and searching geologic similarities and differences, details and unique features of rock material, geological units and structures ...
    ... Terminol- ogy and Nomenclature for the Geologic Database of Serbia carried out by the Faculty of mining and geology, University of Belgrade, funded by the ministry of the environment and Spatial Planning of the republic of Serbia. A short history of geolISSTerm and an overview of the structure and the way ...

  • 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
    ... the base of the column and it is characterised by unsorted and densely packed bioclasts (up to ! mm), rare intraclasts and oncoids arranged in sparitic cement. Dominant red nodular limestone, allochemmicrite (Packstone and Wa- ckestone microfacies), builds the second and the third package of ...
    ... 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 ...
    ... the limestones” scope of application as dimension stone—-slabs for architectural cladding and paving for exterior and interior use—with the possible effect on Serbia's building and stone industry, and eventually the export market. @ Springer V. Matović, T. V. Ćalić Study area The study ...

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... The intensity of these processes depends largely on the ash fineness (particle size and particle size distribution), so that the pozzolanic reactivity increases with the specific surface of ash. International standard ASTM C 311 describes the procedures of chemical and physical methods for ch ...
    ... with the lime content and the control sample is calculated and is 0,966, and with the cement content and the control sample is 0,954. After the calculated coefficient values it is found that the samples with the lime and the cement belong to the very strong correlation group and differ by 1 %. ...
    ... that contain the cement and the lime as the binder (of 2, 4 and 6 %) and with the control sample (100 % of the ash). The linear dependence was made for all variants, and after that the correlation coefficient was calculated. The correlation coefficient is characterized and classified in the specific ...

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... radiation is the primary source of energy for many physical and biological processes on Earth and it is one of the basic preconditions for the existence of the living world. In essence, energy received from the Sun is in the form of light and thermal energy. When considering the total impact of the ...
    ... energy, and energy in biomass and · fossil fuels, · captured · through photosynthesis. For the purpose of heating and electricity production, the application of solar panels (solar thermal panels for heating: water and PhotoVoltaic (PV) solar panels for electricity 325 production) and the ...
    ... M., 2000): • Versatile output: calculates direct, diffuse, global radiation, and direct radiation duration, sun maps and sky maps, and viewsheds; Simple input: requires only DEM, atmospheric transmissivity, and diffuse proportion; Flexibility: — calculates insolation for any: i) specified ...