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Упит dcterms_subject_txt:grain size distribution

508 items

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... to it is modeled by the class OpremaUSistemu. The model also supports a history of changes, which means that if a new distribution of equipment is made, data on the old distribution are stored and saved. «Fk» odKonceptaID TipRelacije «Fk» kaKonceptuID RelacijeTermina odKoncepta 0..1 0 ...
    ... In Figure 5, the left hand side of the panel depicts the predefined classification of equipment types and their groupings, while the right hand size depicts parameters assigned to a specific type of equipment, or its group component. For each parameter assigned to the type of equipment, a data type ...

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... implemented within a mining engineering information system, which has previously also been developed at FMG. Although it has reached a considerable size to date, it is still being intensively enlarged and refined. However, it is also already being used, among other things for the production of controlled ...
    ... the course of our experimenting we concluded that Moodle glossaries are not proper lexical resources, since the format offered by the standard distribution of Moodle does not provide for all the necessary features of a glossary. There is, hence, a need to investigate possibilities of transforming ...
    ... form for development of such resources within this e-learning environment. However, as they are presently configured, within the standard Moodle distribution, their format is inadequate, especially when bilingual or multilingual terminological resources are concerned. Hence, there is a need to transform ...

  • 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
    ... 40 A Main Contactor Size: 38 A Delta Contactor Size: 38 A Star Contactor Size: 25 A Overload Relay Size: 18to 25 Amps Required Cable Size: 3CxCopper 25 Sqmm Recommended Cable Size: 3CxCopper 25 Sqmm Cable Gland Size 25 MM Terminal Block Size: 63 A Cable Lug Size: 25 Sqmm Recommended ...
    ... Recommended Crimping Tool: 16X25 MM Control Wiring Cable Size: 1.5 Sqmm Power Wiring Cable Size: Copper 25 Sqmm Slika 22 Karakteristike električnog-napojnog kabla Na osnovu rezultata proračuna prikazanom na slici 22, usvaja se kabl prečnika od 26mm. Sa prečnikom tubinga od 114.3mm ı pumpom ~76.2mm, ...

  • Project REASONING: Characterization and technological procedures for recycling and reusing of the rudnik mine flotation tailings

    Vesna Cvetkov, Vladimir Simić, Stefan Petrović, Filip Arnaut, Milena Kostović, Dragan Radulović, Jovica Stojanović, Vladimir Jovanović, Dejan Todorović, Nina Nikolić, Jelena Senćanski, Grozdanka Bogdanović, Dragana Marilović (2024)

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... and pressure distribution in the ventilation system; 2) The module for the analysis of the heat pattern in the mine; 3) The module for the analysis of temperature and heat depression distribution in the case of a fire in the mine; 4) The module for the analysis of gas distribution in the ventilation ...
    ... modeling to attain a reliable estimation of air pollution distribution. The relations between GA, NN and CFD are largely influenced by the scale and quality of data as well as the required analysis and estimation results. The distribution of pollutant imission is further being analyzed by an expert ...
    ... training the NN. The first was the classical one, in which the network weights were adapted by the back propagation algorithm (starting from a random distribution of weights). In the second one the initial values of network weights were a result of an optimization process performed by GA. These algorithms ...

  • Numerical modeling of Selanac debris flow propagation using SPH code

    Jelka Krušić, Biljana Abolmasov, Miloš Marjanović, Manuel Pastor, Saeid M. Tayyebi (2021)
    The Selanac debris flow is a very huge event triggered after extreme rainfall caused by Cyclone Tamara activity in the Republic of Serbia in May 2014. The Selanac case study was already modelling in different programs using Voellmy rheology assumptions like RAMMS software. In this paper research are focusing particularly on the process of debris flowing from initiation zone to main deposition area using Geoflow SPH two-phase model considering frictional rheology law. Main rheological parameters are back-calculated using also ...
    debris flow, modelling, SPH code, DEM
    ... us in lithological SCG-XIII INTERNATIONAL SYMPOSIUM ON LANDSLIDES. CARTAGENA, COLOMBIA- JUNE 15th-19th-2020 composition, as well as grain size distribution (from fines to up to m 3 boulders in volume). The total length of the flow is 1.5 km and width is about 350 m in the widest part in the ...

  • Definisanje parametara čvrstoće na smicanje kod izvođenja kosina u ispucalom stenskom masivu

    Zoran M. Berisavljević (2016-04-01)
    Definisanje parametara čvrstoće na smicanje ispucalih stenskih masa predstavlja jedanod najzahtevnijih zadataka mehanike stena. Geotehnička istraživanja su uglavnomograničena na rezultate laboratorijskih ispitivanja malih makroskopski homogenihuzoraka, sa kojih se vrši ekstrapolacija rezultata na terensku razmeru. Ispitivanja semogu vršiti in situ, ali su i ona ograničena veličinom korišćene aparature imikrolokacijom na kojoj se vrše ispitivanja. Pored toga, moguće je vršiti različitaispitivanja na fizičkim modelima, koja su veoma složena i skupa. Ekstrapolacijapodataka sa malog uzorka na terensku razmeru daje mnogo bolje rezultate ...
    naponsko stanje, ispucalost, heterogenost, čvrstoća na smicanje, geološki indeksčvrstoće, Hoek-Brownov materijal, kompozitni uzorci, dezintegracija, povratna analiza

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... fossil fuel inputs. Ration of TFC of electricity and the sum of TFC of electricity and losses is electricity transmission and distribution efficiency (TM1b), while gas distribution efficiency (TM1c) is a ration of TFC of natural gas and the sum of TFC of natural gas and losses. As an indicator of efficiency ...
    ... and heatTM 0.699 (69.9%) Fossil fuel inputs = = (14) Electricity transmission and distribution efficiency: ( )1b TFC of electricityTM 0.835 83.5% Sum of TFC of electricity and losses = = (15) Gas distribution efficiency: 1c TFC of NGTM 0.981 (98.1%) Sum of TFC of NG and losses = = (16) Analysis ...
    ... response indicator that might be important to countries in critical fuel supply situations, such as world oil crisis, disruptions of natural gas distribution systems, etc. [8]. Self-sufficiency Self-sufficiency (SS) can be defined as the ability of energy system to rely on indige- nous reserves and ...

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... Pannonian Basin exhibited an unsatisfac- tory water quality, which is a result of complex geological and hydrogeochemical characteristics. In view of the size of the test area, it was divided into three districts: Banat, Bačka, and Srem. Based on the examples presented, the variation in arsenic concentrations ...
    ... Arsenic concentra- tions vary from 50 to 100 µg/L, with some municipalities recording up to 250 µg/L [19]. The aim of our study was to report current distribution of arsenic in drinking water from the public water supply system in the South Pannonian Basin and to show the effects of drinking arsenic-rich water ...
    ... with the highest arsenic concentration being 234 µg/L, while in Srem 77% of the samples were compliant. The importance of this research of the distribution of arsenic in groundwa- ters used for drinking water supply, in addition to its scien- tific contribution, is primarily related to the impact of ...

  • Еоценска фауна југозападног дела Сирт басена (Либија)

    Љупко Рундић, Мери Ганић (2020)
    Еоцен, крупни мекушци, нумулити, ЈЗ Сирт басен, Либија

  • Дефинисање геотехничких параметара еолских седимената земуснког платоа на основу лабораторијских и теренских SPT испитивања

    Ђорђе Крзман (2024)
    Циљ овог рада је био да се одреде геотехничке караткеристике предметног терена што представља полазну основу за рационално пројектовање и градњу. Истражним бушењем утврђено је да предметни терен изграђују четри лесна хоризонта и три слоја погребене земље до дубине од 22-23 m. Лабораторијским испитивањем добијени су ефективни параметри смичуће чврстоће, где се кохезија најчешће креће између c’=14 и 18 kPa, а угао унутрашњег трења f'= 25 - 30 °. Теренска SPT испитивањем уз коришћење прихваћених корелација у геотехничкој пракси ...
    лес, лабораторија, SPT, корелације, параметри
    ... interlayers of sand– |Detween 86-87m above sea level. Loess-like deposits have an uneven dusty composition, locally they |contain concretions 1-2 cm in size, tiny plant fibers and traces of Mn and Fe oxides. They have fine tubular porosity, appear compact, have a higher degree of humidity than upper sediments ...
    ... |BURIED SOIL - HORIZON III: les between elevation 80-81 (+ 1.5m). It has a silty clay composition, with |rare carbonate concretions up to 1 cm in size, carbonate scrams along cracks, Fe and Mn oxide staining. |Dark red to brown color, small tubular and fissured porosity, hard, crumbly, frinble. ...
    ... are of an uneven, silly, sandy composition, most often clayey, they contain carbonate in fhe form of mossy |accumulations and concretions 1-3 cm in size, as well as staining, stains and scraps of Mn and Fe oxides. | ney are easily destroyed to silt particles, they are wetted soft and soft plastic, ...

  • Comparative analysis of correlation coefficients in mineralogical and geophysical data from the mine tailing site “Rudnik” (Serbia)

    Vesna Cvetkov, Filip Arnaut, Dragana Životić (2024)

  • Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin

    Dušan Polomčić, Bojan Hajdin, Marina Ćuk, Petar Papić, Zoran Stevanović (2014)
    menadžment podzemnih voda, monitoring, kvalitet podzemnih voda, bilans, baza podataka

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... of methanotrophs present in lignites depends on the physicochemical changes in the environment. 4. Conclusions The obtained results show that the size and nature of the GHG emis- sions depend on the lithotype of brown coal. The lowest impact on the environment was found in xylitic lignite (with GWP ...
    ... Peach, C.J., Spiers, C.J., 2016. Anisotropic swelling behaviour of coal matrix cubes ex- posed to water vapour: effects of relative humidity and sample size. Int. J. Coal Geol. 167, 119–135. https://doi.org/10.1016/j.coal.2016.09.011. Liu, B., Vrabec, M., Markic, M., Püttmann, W., 2019. Reconstruction of ...
    ... and the NMDS axes. The most important were Eh, TOC and N-NO3, which were strongly corre- latedwithbothNMDS axes. These parameters governed the distribution of the majority of points, which were clustered together along Eh-NO3 vector. Points representing samples characterized by the highest Eh and N-NO3 ...

  • Rule-based Automatic Multi-word Term Extraction and Lemmatization

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac (2016)
    In this paper we present a rule-based method for multi-word term extraction that relies on extensive lexical resources in the form of electronic dictionaries and finite-state transducers for modelling various syntactic structures of multi-word terms. The same technology is used for lemmatization of extracted multi-word terms, which is unavoidable for highly inflected languages in order to pass extracted data to evaluators and subsequently to terminological e-dictionaries and databases. The approach is illustrated on a corpus of Serbian texts from ...
    term extraction, terminology, multi-word units, lemmatization, finite-state transducers
    ... system 4. Evaluation For evaluation we used a corpus that contains 10textbooks, 2 projects and 51 journal articles from the mining domain. The size of this corpus is 32,633 sentences and 625,105 simple word forms. For calculation of measures that compare results on a domain corpus with general ...
    ... second phase 114,979 MWU lemma candidates were obtained. For evaluation we kept only candidates whose frequency passed the threshold of 7. Distribution of retained MWU forms and lemmas by graphs that retrieved them is given in Table 4. Table 4. Number of lemmas that passed the frequency ...
    ... applying rules described in Section 2, leaving 1,958 lemmas which cover 33,153 forms recognized in the corpus, out of which 4,067 distinct. Distribution of these MWU forms and lemmas by graphs is given in Table 5. Table 5. Number of lemmas that are passed for manual evaluation For the ...

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

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... environment, the facility’s current development status, need for (and availability of) accommodation, and seasonal sensitivity. The study of such a size was also seen as an opportunity to explore options for “branding” the wellness and spa/medical facilities of Vojvodina through recognizable design features ...
    ... Design goals were addressed through a variety of design strategies, which were applied to 20 sites with wellness and spa facilities that ranged in size from small mobile units for balneotherapy to complex multifunctional developments. The main design strategies, developed mainly based on bioclimatic ...
    ... wellness facilities. The calculated thermal power that can be obtained from geothermal energy is in the range of 300 kW (GHP) to 950 kW (direct use). The size of wellness facilities can be predicted by matching developed scenarios based on different standards for envelope U values and outside temperature in ...

  • New data from the Lower Cretaceous carbonate platform deposits of Dimitrovgrad section (Southeastern Serbia)

    Jelena Stefanović, Bojana Džinić, Giovanna Della Porta, Dejan Radivojević (2021)
    Lower Cretaceous, facies analyses, limestones, Getic, Serbia, carbonate platform
    ... Bulgaria, whereas detailed investigation on the Serbian side of the Getic platform was limited to solving biostratigraphy, paleontology and facies distribution issues on local scale, mostly in northeastern Serbia. The most exhaustive research on the Getic platform in southern and central Serbia dates ...
    ... to reef depositional environment. Besides that, the pyrite rich siliciclastics provide the information of transition to slope environment. The distribution of different facies show rapid lateral and vertical changes of depositional environments varying from platform interior to reef and finally to ...

  • Towards more sustainable district heating systems in Serbia - Options and obstacles

    Marija Živković, Boban Pavlović, Dejan Ivezić, Miloš Tanasijević, Dejan Stojanović (2024)
    The major share of energy consumed in the building environment is dedicated to meeting heating needs, which makes this sector one of the key players in the transformation of the whole energy system. The accurate approach to the transition process assumes acting on both the demand and supply sides. Lately, the supply side has received more attention, as its transformation is one of the key steps of the energy transition process. District heating systems are recognized as substantial contributors ...
    energetska tranzicija, daljinsko grejanje, dekarbonizacija, obnovljivi izvori energije, prepreke, Srbija

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... based on the assumed condition of the pump and determine: minimal load on the sucker rods and pump unit, and if necessary, the counterweight size, reducer size, and motor power for the pumping installation. Design Methods: — API Method — Wave Equation API method This method was developed in ...
    ... RodStar lets you input a target production rate and simultaneously calculates strokes per minute, plunger size, and rod string design. It even suggests the appropriate pumping unit size. Alternatively, you can enter IPR data to have RodStar calculate the target production rate and design the ...
    ... Taper Top Steel Rod Lcading Min API Unit Rating Min NEMA D Motcor Size Polished Rod Power TVLcad SVLoad Design Inputs Unit Pump Depth Target Rate Stroke Rate (SPM) Surface Stroke Length Pump Diameter (D} Tubing Size Anchored Tubing Rod Type API Rod Number APIRod Grade Default Settings ...

  • SrpELTeC: A Serbian Literary Corpus for Distant Reading

    Ranka Stanković, Cvetana Krstev, Duško Vitas (2024)
    U članku je predstavljen SrpELTeC, korpus razvijen u okviru akcije COST Distant Reading for European Literary History (CA16204). Svi romani u SrpELTeC-u su odabrani, pripremljeni i obeleženi korišćenjem zajedničkih principa uspostavljenih za sve jezičke zbirke u Evropskoj zbirci književnog teksta (ELTeC). Navedeni su izazovi i rešenja u pripremi SrpELTeC od nule. Svi romani su ručno kodirani u TEI sa bogatim metapodacima i strukturnim napomenama. Automatska anotacija je uključivala POS-označavanje, lematizaciju i imenovane entitete, oslanjajući se na resurse za obradu ...
    digital humanities, Serbian literature, text corpora, distant reading , linked data, named entity recognition, text analytics