Претрага

Упит dcterms_subject_txt:Fluid Flow and Transfer Processes

2357 items

  • Старење бунара у алувијалним срединама различитог степена оксичности

    Brankica Majkić (2013-09-27)
    Старење бунара настаје као последица процеса корозије и колмирања. Процесекорозије могуће је спречити уградњом филтерских конструкција од материјалаотпорних на корозију. Колмирање може да настане без обзира на врсту материјалаод кога се праве бунарске конструкције, а процесом може бити захваћенаприфилтарска зона па и зона саме водоносне средине. Из тог разлога тезa јеусмеренa на процесе који доводе до колмирања бунара и последицe опадањaкапацитета водозахватних објеката. Полазна хипотеза је да бунари стареразличитом брзином у срединама различитог степена оксичности. Хидрохемијскеи микробиолошке карактеристике подземних ...
    старење бунара, алувијалне издани, степен оксичности средине,колмирање, бунарски талог, локални хидраулички губитак, дозвољене улазнебрзине
    ... Measurements in Natural Waters: Significience: Concepts and Problems, in: Redox: Fundamnetals, Processes and Apllication (ed. Schuring J., Schulz H.D., Fisher W.R., Bottcher J and W.H.M Duijnisveld), Springer-Verlag Berlin and Heidelberg GmbH and Co, 276 p. 118. Sichardt W. (1928): Method of sta ...
    ... is on the processes that lead to well clogging and the impact of such processes on declining well capacity. The starting hypothesis is that wells age at varying rates in sediments of different oxic conditions. Hydrochemical and microbiological characteristics of the groundwater and the composition ...
    ... R. and F.G. Ferris (2004): Biomineralization by Gallionella, Geomicrobiol.J. 21, 325-330 148. Harder E.C. (1919): Iron-depositing bacteria and their geologic relations, United States Geological Survey, Professional Papers 113., p.89 149. Hauck, G. and R. Novak (1987). ”Interaction of Flow and ...

  • Opremanje bušotine X zavojnom pumpom

    Milan Filipović (2024)
    Ovaj rad se bavi osnovnim pojmovima i karakteristikama zavojnih pumpi.Prikazan je sklop zavojnih pumpi i njena prateća oprema. Objašnjen je princip rada zavojnih pumpi kao i uloga svakog mašinskog elementa koji se nalazi u pumpi. Razmotrene su prednosti i nedostaci primene ovih primarnih mehaničkih metoda eksploatacije ugljovodonika. Dat je uvid u inovativna rešenja problematike primene zavojnih pumpi. Na konkretnom primeru bušotine X su prikazani problemi kao i rešenja primene ovih primarnih mehaničkih metoda u praksi. Napravljena je detaljna analiza ...
    zavojne pumpe, oprema, primarne mehaničke metode, ugljovodonici, analiza rada
    ... Pack služi da filtrira čestice na ulazu u bušotinu radi zaštite opreme i lakše proizvodnje fluida. Na slici 12 je prikazan konačni model bušotine X sa pratećom opremom: 1 ) SURFACE EQUII Sk __J Tubing flow from Perforacija Tubing Pk Perforacija 805 m ___ - 807m — Casing 810m — Slika ...
    ... eering.net/new- progressive-cavity-pump-design-makes-maintenance-a-breeze • Zhu,J. & Zhang H.Q. (2018). "A Review of Experiments and Modeling of Gas&Liquid Flow in Electrical Submersible Pumps", project: Mechanistic modeling in Electrical Submersible Pumps (ESP) Soleša, M., Danilović, D., ...
    ... priložene slike se zelenim strelicama može videti utok fluida u bušotinu. Isprekidana plava linija na dnu predstavlja sredinu perforacije. 3.3 IPR kriva i profil fluida Na osnovu merenja tokom proizvodnje fluida, izgrađen je profil fluida koji se na osnovu korelacija upotrebljava radi preciznije ...

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... for municipal waste classification within separation and transfer stations. Grain size distribution analysis separates fine grained particles which are usually earthen origin — earthy waste (material from cover, degraded material and similar) as well as large particles of different materials ...
    ... types of fluid within the pore space of waste (Zornberg et al., 1999). Very wide intervals of municipal waste moisture can be found in the literature. As a rule, municipal waste moisture is the highest in the spring and autumn period (about 50%), because besides higher rainfalls and content ...
    ... content can be observed based on the mechanism of fluid retention within the pore space of waste: a) moisture within waste particles 1.e. moisture in pores inside particles, b) moisture between particles 1.c. in pores between particles and c) moisture that waste particles with low hydraulic ...

  • A contribution to the knowledge of facial diversity of Badenian sediments in the Belgrade area

    Filip Anđelković, Dejan Radivojević (2018)
    baden, Beograd, facije, facijalna raznovrsnost, sedimenti
    ... composed of Mesozoic  sediments, ophiolites  and ophiolitic mélange, Cretaceous  to Paleogene  flysch  sediments  and  Lower Miocene  continental  sediments.  The  diversified  basin  basement  and  tectonic  processes during the Badenian led to the horizontal and vertical facial changes. Badenian sediments are  ...
    ... erates  (on  Kalemegdan  and  in Rakovica  stream)  and  poorly  cemented  sandstones  and  sands  (type  locality  is  in  Rakovica  stream).  The  conglomerates  contain  numerous  Ostrea  shells  and  represent  a  basal  series.  According to Anđelković M. and Anđelković J., they mark the second ...
    ... „Leitherkalk“  (Gruber,  1988)  or  „Leitha  limestones“)  and  Rakovica  clastic  sedi‐ ments (sands and conglomerates). There are two additonal facies in the Belgrade area, Višnjica clays and  Konjarnik schlier, but they have limited exposure and were inaccessible at the time of field exploration.  Th ...

  • Novi pristup proučavanju tekstura minerala značajnih za istraživanje rudnih ležišta

    Aleksandar Pačevski (2022)
    ... Mining and Geology, Belgrade, Serbia, E-mail: aleksandar.pacevski(ergf.bg.ac.rs Key words: texture, ore, microanalysis, pyrite The complete determination of a mineral composition and textural characteristics of the ores is crucial for correct interpretation of the ore-forming processes and genesis ...
    ... enabled a further shift in the study of minerals and their textures to nanometer and even atomic levels, which certainly offers great opportunities, but at the mean time makes a research very complex. Scanning and Transmission Electron Microscopy (SEM and TEM) methods in combination with Electron Microprobe ...
    ... on a micrometer scale, and thus provide significantly more data important for investigating not only deposit genesis, but also possibilities and efficiency of their exploitation. With the development of polarized light microscopy as the basic methods of minerals, ores and rocks study, numerous textural ...

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • Combining Heterogeneous Lexical Resources

    Cvetana Krstev, Duško Vitas, Ranka Stanković, Ivan Obradović, Gordana Pavlović-Lažetić (2004)
    development of lexical resources, morphological dictionaries, WordNet
    ... DELAS that correspond to the concept’s hyponyms. The main feature of ILReMaT is its capability to work with a wordnet and DELAS dictionaries in parallel and to enable transfer of information from one type of a resource to the other. In order to perform these tasks special tab-pages of the edit ...
    ... already been attached to simple word entries in Serbian MD, such as +Hum (human) and +Bot (botanic) for nouns, and +Col (colour) and +Mat (material) for adjectives. The use of wordnet enables a more systematic and more detailed attachment of such marks. Moreover, the attachment can be modeled ...
    ... both (brow:1, forehead:1) and (cello:1, violoncello:1). By adding the information obtained from the WN hypernym/hyponym relations these two entries can be distinguished: for instance, cyelo,N300+BodyPart and cyelo,N300+Artifact, or cyelo,N300+Thing+BodyPart+Feature and cyelo,N300+Artifact+Devi ...

  • Callovian (Middle Jurassic) Sphriganaria (Brachiopoda) from the Jordan Valley (Middle East)

    Howard R. Feldman, Barbara V. Radulović, Fayez Ahmad (2023)
    Brachiopods, Middle Jurassic, Sphriganaria, shell microstructure, Ethiopian Province

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • Ostvarivanje dobiti pri uvođenju sistema agregatnih zamena na osnovnoj rudarskoj mehanizaciji površinskih kopova EPS

    Predrag Jovančić, Ignjatović Dragan, Đenadić Stevan (2021)
    Jedan od osnovnih zadataka na površinskim kopovima uglja je ostvarivanje zadovoljavajućeg vremenskog i kapacitetnog iskorišćenja kontinualnih sistema. Da bi se to postiglo, neophodno je izvršiti izmene u postojećoj strategiji održavanja. Preduslov je uvođenje agregatne zamene vitalnih delova na rudarskim mašinama. Benefiti su višestruki. Očekivani rezultati ovakvog pristupa su: smanjenje zastoja i povećanje vremena rada; direktne materijalne uštede; bolja organizacija rada; racionalizaciju radioničkih i magacinskih kapaciteta; povećanje vrednosti mašina. Da bi se uvela agregatna zamena neophodne su investicije za nabavku ...
    agregatne zamene, održavanje, mehanizacija, Benefit Cost analiza

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2

    Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)
    Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...
    Metals and Alloys, Biochemistry, Biomaterials, Biophysics, Chemistry (miscellaneous)
    ... quent processes of membrane remodeling and production of important regulatory molecules in host defense against tumor cells. Thus, detailed knowledge of interaction between phos- pholipase Az and metallo-drugs can be later exploited in further development of therapeutic strategies. Materials and methods ...
    ... which might cause significant changes in the subse- quent processes of membrane remodeling and production of important regulatory molecules in host defense against tumor cells. Thus, detailed knowledge of interaction between phos- pholipase A2 and metallo-drugs can be later exploited in further development ...
    ... colon carcinoma cells, we can assume that inhibitors of sPLA2, such as transition metal complexes, might contribute to the processes of inhibition of prostate tumor growth and differentiation, i.e. that they will have rather beneficial effects. In addition, inhibition of secre- tory PLA2 with transition ...

  • Optimising in electrical energy consumption in mining plants

    Snežana Aleksandrović, Vesna Damnjanović, Ilija Jeftenić (2018)

  • Prirodno prečišćavanje i stimulisana bioremedijacija podzemnih voda zagađenih naftnim ugljovodonicima

    Nenad M. Marić (2016-09-26)
    Disertacija se konceptualno sastoji iz dva dela kojima je obuhvaćen pasivan (prirodnoprečišćavanje) i aktivan remedijacioni pristup (stimulisana bioremedijacija) kodpodzemnih voda zagađenih naftnim ugljovodonicima.U prvom delu disertacije prikazani su rezultati osmatranja procesa prirodnogprečišćavanja u podzemnim vodama na lokaciji istorijskog zagađenja kerozinom.Tragovi zagađenja naftnim ugljovodonicima pronađeni su 20 godina nakon prosipanjakerozina. Ovo je stvorilo osnovu za proučavanje efekata dugotrajne izloženostipodzemnih voda procesima biodegradacije u terenskim uslovima. Uočeno je da sesnižene koncentracije elektron akceptora (O2, NO3-, SO42-) i povišene koncentracijemetaboličkih produkata biodegradacije ...
    podzemne vode, naftni ugljovodonici, kerozin, prirodno prečišćavanje,stimulisana bioremedijacija
    ... org/dynamics/modules/SFIL0100/view.php?fi_Id=126. 139. Vroblesky D, Chapelle F (1994) Temporal and spatial changes of terminal electron-accepting processes in a petroleum hydrocarbon-contaminated aquifer and the significance for contaminant biodegradation. Water Resources Research, Vol. 30, no. 5 ...
    ... procesima (TEAP) podrazumevaju reakcije koje oslikavaju glavne oksido-redukcione procese, čime se ne uzima u obzir celokupan lanac transfera elektrona Vroblesky and Chapelle (1994) su pokazali da su TEAP prostorno i vremenski promenljivi u okviru zagađujućeg "tela". Šematski prikaz prostornog rasporeda ...
    ... Microbiol. 56(3), 646-651. 117. Speidel DH and Agnew AF (1988) The World budger. In Perspectives in Water Uses and Abuses, DH Speidel, LC Ruedisili and AF Agnew Eds., Oxford University Press, New York. 118. Spotl C (2005) A robust and fast method of sampling and analysis of δ13C of dissolved inorganic ...

  • Optimizacija utovarno-transportnih sistema u funkciji planiranja površinskog kopa

    Mirjana V. Banković (2018-07-13)
    Profitabilna eksploatacija sve složenijih ležišta je težak zadatak koji zavisi odtemeljnog procesa analize, planiranja i projektovanja rudnika. Izvodljiv strateškiplan mora da zadovoljava društvena, regulatorna, tehnološka, geometrijska iekonomska ograničenja. Kako bi se postigao osnovni cilj, odnosno profitabilnost iodrživost rudarskog projekta na duži period, neophodno je unapređenjematematičkih modela i informatičke podrške procesima planiranja i optimizacijekoji će omogućiti efikasnu realizaciju ovih ciljeva...
    tehnološki model, integralni model, planiranje, optimizacija,utovarno-transportni sistem, neto sadašnja vrednost projekta
    ... long run, it is necessary to improve the mathematical models and IT support to the processes of planning and optimization that will enable efficient realization of these goals. Optimization of mine planning process implies a complex analysis and a scientific approach, so the classical methods used do not ...
    ... Hill, S. P., 2003, An application of branch and cut to open pit mine scheduling. Journal of global optimization, 27 (2-3), 349-365. Chandran, B. G., Hochbaum, D. S., 2009, A computational study of the pseudoflow and push-relabel algorithms for the maximum flow problem. Operations research, 57 (2), 358-376 ...
    ... optimal solution especially in complex mining processes such as exploitation systems on surface mines. An integral approach to optimizing planning and analyzing the exploitation system is a very important approach in the evaluation of mining projects, and significantly affects the economic efficiency ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... Schütze, H.: Introduction to Information Retrieval, vol. 1. Cambridge University Press (2008) 9. Martinović, M.: Transfer of Natural Language Processing Technology: Experi- ments, Possibilities and Limitations Case Study: English to Serbian. INFOtheca 9(1–2), 11a–21a (May 2008) 10. Maurel, D., Friburger ...
    ... of geologic data, and provide a modern and effective in- formation basis for carrying out all activities related to planning, design and decision-making in the field of geology. Within the project a web portal3 was established that allows quick and easy access to geological data and information in the ...
    ... usually refers to names of persons, locations and organizations, and numeric expressions including, time, date, money and percentage. Recently other major types are being included, like “products” and “events”, but also marginal ones, like “e-mail addresses” and “book titles”. The NE hierarchy in our Named ...

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • The Nooj System as Module within an Integrated Language Processing Environment

    Ranka Stanković, Duško Vitas, Cvetana Krstev (2008)
    NooJ, electronic dictionary, lexical resources
    ... MusicInstr if more semantics is used. The principal feature of WS4LR is its capability to work with a wordnet and morphological dictionaries in parallel and to enable transfer of information from one type of a resource to the other. In order to perform these tasks special tab-pages of the ...
    ... Mathematics, University of Belgrade, and is aimed at manipulating heterogeneous lexical resources developed in the course of many years and within different projects. The tool handles morphological dictionaries, wordnets, aligned texts and transducers and has already proved very useful for various ...
    ... years, and it is understandable that they have been conceived within different projects and frameworks, both from the conceptual and the technological perspective. Despite that the HLT group made every reasonable effort to keep the constantly growing pool of resources as coherent and standardized ...

  • 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

  • Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world

    Bogoljub Vučković, Bojan Dimitrijević (2023)
    The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...
    lignite, heavy metals, concentrations
    ... the Velika Morava and Mlava rivers, which flow into the Danube in that area (figure 1 and 2). Itis divided into two parts by the Danube - to the south is the Kostolac Basin, and to the north ofthe Danube is the Kovin Basin (Figure 2). Geological explorations began in 1941 and continues to this day ...
    ... pits of Stari Kostolac and Ćirikovac, after that in the surface mines of Klenovnik and Cirikovac, picture 2) and are not being excavated now; 177 2. Now in the excavation phase are some parts of 1, II and III layers (I and II layers in Kovin by underwater exploitation; II and III layers in the Drmno ...
    ... seams and perform a comparative analysis of coal af}ectation on the environment. P/ith 155 analyzes of HM from coal, 45 from ash, 165 from gravel and 30 from soil, we perform analysis of horizontal and vertical distribution of HM and comparative analysis. B/hat interests us as authors and you as ...