Претрага
271 items
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Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry
Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalizationSteven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti. "Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945979
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Proučavanje razvića Bihaćkog i Cazinskog basena primenom gravimetrijskih podataka
Bihaćki i Cazinski baseni su neogeni baseni, koji pripadaju spoljašnjim Dinaridima i formirani su tokom kasne faze razvoja Dinarida. Ovi baseni su od posebnog interesa zbog svoje geološke prošlosti i potencijalnih strukturnih karakteristika. U istraživanju, primenjeni su gravimetrijski podaci u clju boljeg razumevanja evolucije ovih basena. Primenom različitih postupaka matematičkih transformacija na gravimetrijskim podacima može se ustanoviti gravitacioni uticaj neogenih basena male gustine i mogu se detektovati strukture, koje su potencijalno vezane za njihovo formiranje. U ovom istraživanju, analiza ...Snežana M. ignjatović, Ivana M. Vasiljević, Nevena R. Andrić-Tomašević, Ana S. Mladenović. "Proučavanje razvića Bihaćkog i Cazinskog basena primenom gravimetrijskih podataka" in Tehnika, Beograd : Savez inženjra i tehničara Srbije (2024). https://doi.org/10.5937/tehnika2403287I
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Analysis and visualization of geophysical well-logging data from closely spaced boreholes
Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...... analyzing the condition of a rock mass between boreholes, not only inside them. First, the log diagrams were digitized, data along the borehole line was filtered and then the data of the individual logs were interpolated to obtain a 2D representation of the results (Fig. 1). Well logging curves ...Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov. "Analysis and visualization of geophysical well-logging data from closely spaced boreholes" in Vth Congress of the Geologists of the Republic of North Macedonia, Ohrid, Republic of North Macedonia, September 27-28, 2024, Macedonian Geological Society (2024)
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Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential
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... sonal changes as well as prospective changes (anticipated and unexpected) throughout the facility’s lifespan; • infrastructure independence—aimed at off-grid functionality, especially for the re- mote sites; • carbon footprint—aimed at carbon-neutral developments; Appl. Sci. 2021, 11, 2691 7 of 24 ...
... was developed, matching energy availability according to the concept of modularity. 2.1. Architectural Model—Design Premises Design premises were in line with UN sustainability goals [30], where sustainable and resilient architecture for healthcare and spa facilities was conceived as the driver for a ...
... wells or in a natural way over the springs. The natural discharge is connected only to the terrain of Fruska Gora, where it takes place along fault-line structures and at the contact point of water-permeable and water-resistant rocks. The outlet temperatures of geothermal waters formed within this type ...Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić. "Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential" in Applied Sciences-Basel, МDPI (2021). https://doi.org/10.3390/app11062691
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Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeBranislav Petrović, Veljko Marinović, Zoran Stevanović. "Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling" in Environmental Earth Sciences, Springer Science and Business Media LLC (2023). https://doi.org/10.1007/s12665-023-10911-5
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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... accurate monitoring of operating conditions. Typical rod pump automation includes instrumentation with load cells and position sensors, a pump shut-off control device, a control panel, and a motor drive, and in some cases, a variable-speed drive. Additionally, a radio for receiving and sending i ...
... error analysis Figure 4.2 Machine learning approach If spammers notice that your filter blocks messages containing the word "Your" in the subject line, they might start using the phrase "For You" to bypass the filter. In a traditional programming approach, you would need to manually add new rules ...
... downhole dynamometric card. Examples of these patterns for operating conditions on surface and downhole dynamometric cards are shown in Figure 6.1. Line card Noise card Surface card Dovmnhole card Downhole card Surface card 6000 4000 ~ı M\ s s a) š 2000 0 5 10 15 20 25 30 b) š -4000 WAAWF@@JW{ ...Maja Trikić. Application of machine learning for diagnosing the operation of a deep well pump in oil production, 2024
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OER obrazovni sadržaji kao spona između akademskog i preduzetničkog znanja
... može se reći da ova platforma ne zahteva visok stepen računarskih veština. Sam postupak kreiranja kursa je relativno jednostavan, a postoji i on line podrška u vidu tutorijala. Da bi korisnik kreirao edX kurs u okviru BAEKTEL projekta neophodno je da pristupi web adresi: http://edx.baektel.eu:18010 ...Ivan Obradović, Ranka Stanković, Marija Radojičić. "OER obrazovni sadržaji kao spona između akademskog i preduzetničkog znanja" in The fifth Symposium Mathematics and Applications 2014,17-18 October 2014, Belgrade V no. 1, Beograd : Matematički fakultet Univerziteta u Beogradu (2014)
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Using Lexical Resources for Irony and Sarcasm Classification
The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...... “figuratively” [14]. Authors in [29] used a microblogging platform called Plurk, similar to Twitter, to create a corpus of ironic statements. Other on- line resources can also be used for ironic corpus creation – Google Books search was used in the work by [21], where the phrase “said sarcastically” was ...
... te ni promaja ne bi udarila ‘you are so ugly that even the draught wouldn’t hit you’. 5.2 The application of the irony classifier to sarcasm A thin line divides ironic utterances from sarcastic ones. There are many definitions and comparisons of these two figures. According to one of themost comprehensive ...Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković. "Using Lexical Resources for Irony and Sarcasm Classification" in Proceedings of the 8th Balkan Conference in Informatics (BCI '17), New York, NY, USA, : ACM (2017). https://doi.org/
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Application of stochastic models for mine planning and coal quality control
... power plants [2]. However, decisions about coal homogenization must deal with uncertainty and variability in coal properties, and with the effect of off-design coal characteristics on power plant performance and cost. According to Shih and Frey [3] sulfur and ash content and heating value are considered ...
... 1 if that point is in the polygon and value 0 if the point is out of the polygon. This function can be calculated by taking an arbitrary ray (half-line) from the point that inter- sects the sides of the polygon. If the number of intersections is even, then the value of the func- tion is 0, and if ...
... According simulated daily or shift mine plan each BWE has working bench position and pro- duction parameters. Mass and quality control will be done by on-line devices and weightmeters on main belt conveyor. If coal quality has required values coal is transported directly to thermal power plant, if not coal ...Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković. "Application of stochastic models for mine planning and coal quality control" in Thermal Science, Belgrade : Vinča Institute of Nuclear Sciences (2014). https://doi.org/10.2298/TSCI130201031S
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Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeLjiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu. "Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-08910-x
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Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules
The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analizaSvetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón . "Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules" in Bulletin of Engineering Geology and the Environment , Springer (2024). https://doi.org/10.1007/s10064-024-03667-0
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Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia
... fewer features, this model offers the added benefit of a 55% reduction in computation time. In this instance, it may be beneficial to make a trade-off by selecting a model that is statistically inferior but yields satis- factory visual outcomes, while requiring 55% less computa- tional time. This ...
... extent of known faults in the area, while the Euclidian AlI the obtained data was transformed to the MGI Bal- Distance tool calculates the straight-line distance from cach — kans Zone 7 projected coordinate system. The target varia- pixel to the nearest fault. The resulting raster map can be — ble ...
... 10 km RF_C_100_5MI Fig.9 RE model with only five most informative features (RF_C_100_5MI); n- number of ophiolite class instances; black out- line- field mapped ophiolites; red markers- predicted ophiolites of the C dataset models. In general, the RF_C_100_5MI model exhibits comparable prediction ...Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski. "Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia" in Earth Science Informatics, Springer Science and Business Media LLC (2024). https://doi.org/10.1007/s12145-024-01243-4
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Legal framework for recultivation of degraded areas caused by mining exploitation
Radmila Gaćina (2023)Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...... include: reclaimed land area, surface cover thickness, ground slope and drainage function, the physical and chemical properties of the soil are in line with the standards of arable land, and the failure to meet the acceptance criteria, should not pass the acceptance (Guo at all, 2022). After the ...Radmila Gaćina. "Legal framework for recultivation of degraded areas caused by mining exploitation" in Underground mining engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2023). https://doi.org/10.5937/podrad2342027G
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The number of unimodular roots of some reciprocal polynomials
Dragan Stankov (2020)We introduce a sequence P2n of monic reciprocal polynomials with integer coefficients having the central coefficients fixed. We prove that the ratio between number of nonunimodular roots of P2n and its degree d has a limit when d tends to infinity. We present an algorithm for calculation the limit and a numerical method for its approximation. If P2n is the sum of a fixed number of monomials we determine the central coefficients such that the ratio has the minimal limit. ...Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "The number of unimodular roots of some reciprocal polynomials" in Cmptes rendus mathematique (2020). https://doi.org/10.5802/crmath.28
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Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian
Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek (2021)Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek. "Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian" in Language and Text: Data, models, information and applications, John Benjamins Publishing Company (2021). https://doi.org/10.1075/cilt.356.04ruj
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Coal homogenization stockyard sizing “Tamnava – Zapad” case study
... gray lines show the different simulations. The bottom and top dotted lines show the minimum and maximum simulated values, while the middle dotted line is the arithmetic mean of the simulations. Figure 1. Number of coal stacking layers at the "Tamnava - Zapad" pit as a function of standard ...Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer. "Coal homogenization stockyard sizing “Tamnava – Zapad” case study" in Proceedings of 13th International Symposium Continuous Surface Mining, ISCSM 2016, / (2016)
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Approach to operational mine planning: Case study Tamnava West
... for black coal utilization, Callaghan 5 Galetakis M, Pavloudakis F, 2009, The effect of lignite quality variation on the efficiency of on-line ash analyzers, International Journal of Coal Geology, vol. 80, pp. 145-156 6 Beretta F, Costa J, Koppe J, Souza V, 2009, Reducing coal quality ...Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković. "Approach to operational mine planning: Case study Tamnava West" in Tehnika, Beograd : Savez inženjera i tehničara Srbije (2014). https://doi.org/10.5937/tehnika1406952S
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GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities
Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević . "GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities" in Contributions to International Conferences on Engineering Surveying. Springer Proceedings in Earth and Environmental Sciences, Dubrovnik, Croatia, October 22-23, 2020, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-51953-7_21
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Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)
... 1991; Ricou 1994; Schmid et al. 2008; Stampfli and Hochard 2009). Therefore, to reveal the tectonic evolution of these intra-Alpine crystal- line units, their complex structural patterns need to be stud- led in detail together with determination of age of their pro- toliths and timing of ...
... cleavage Ss. These axes are generally plunging in the south-western quadrant (Fig. 4b). Kinematic indicators such as shear bands, polycrystal- line sigmoids, and asymmetric clasts on outcrops, as well as biotite fish in thin sections, were observed in the XZ plane and indicate generally top ...
... (T')) and Lower Complex gneiss (G) in the Slatinska Reka Valley (22%1'30.716”E, 42%0'"%53.365"N). Trace of the contact plane is indicated by black line. S, foliation formed during D, and folded into isoclinal folds F»; S» axial-plane cleavage related to folds F, during D,. Length of ham- mer ca ...Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel. "Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)" in International Journal of Earth Sciences, Springer Science and Business Media LLC (2016). https://doi.org/10.1007/s00531-016-1380-6
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Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија)
Милош Велојић (2021)Главни циљ испитивања хидротермалног система Чукару Пеки је разумевање процеса који су довели до његовог настанка, а посебно еволуције рудоносних флуида из којих је настала рудна минерализација. Утврђено је да је овај систем настао у периоду пре 86,78 - 85,19 Ma из магматског интрузива који је био богат водом и имао висок оксидативни потенцијал. Током хлађења, из овог магматског интрузива су издвојени веома врели флуиди, који су имали температуре изнад 600°С и висок салинитет. У ...Борска металогенетска зона, Тимочки магматски комплекс, порфирска лежишта, високосулфидациона лежишта, флуидне инклузије, рудне парагенезе, геохронологија, хидротермалне алтерације, LA-ICP-MS... Укупно (%) Line spectrum(1) 0,00 53,71 0,41 45,88 100 Line spectrum(2) 0,08 52,86 0,00 47,05 100 Line spectrum (3) 0,12 53,17 0,00 46,71 100 Line spectrum (4) 0,08 53,31 0,00 46,61 100 Line spectrum (5) 0,15 53,17 0,00 46,69 100 Line spectrum (6) 0,09 53,27 0,00 46,64 100 Line spectrum (7) ...
... O Na Si S Ca Fe Cu Укупно Line Spectrum(1) 0,00 50,64 0,11 41,79 7,46 100,00 Line Spectum(2) 0,09 52,78 0,00 46,88 0,24 100,00 Line Spectrum(3) 5,81 0,29 0,18 42,44 0,42 50,11 0,75 100,00 Line Spectrum(4) 0,22 53,64 0,00 45,84 0,30 100,00 Line Spectrum(5) 0,14 52,14 0,00 ...Милош Велојић. Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија), Београд : [М. Велојић], 2021