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Упит dcterms_subject_txt:mechanical extraction methods,

567 items

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... process stream, capturing after combustion, capturing before combustion and capturing CO2 by oxy-fuel. In this paper is presented an overview of methods for CO2 capture and different technological procedures for separation of CO2 such as absorption, adsorption, cryogenic distillation, and membrane-based ...
    ... concentration [28]. For the reason that power plants have high concentration of CO2 in flue gases, this procedure is usually combined with other methods. 3.3. Membrane-based separation Membrane technology for gas separation is a pressure driven process, i.e., difference of partial pressures of ...

  • Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example

    Miloš Marjanović, Biljana Abolmasov, Igor Peshevski, James Reeves, Irena Georgievska (2020)

  • WS4LR - a Worksation for Lexical Resources

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Ivan Obradović (2006)
    Lexical Resources, Wordnet, Serbian
    ... representing aligned texts is the Translation Memory eXchange format (TMX) that is XML-compliant 5 . The alignment itself can be performed by different methods and tools (Veronis, 2000). Of particular interest are programs that use XML tagged input texts and produce the result also as an XML document. Such ...
    ... words management + Nooj dictionaries management WORDNET DEVELOPMENT + Manipulation of one or two wordnets + Synsets retrievement using various methods + Navigation by following hypernym/hyponym relations + Copy of synsets with translation support + Exchange of information with morphological ...
    ... synchronized using ILI. The user can navigate through wordnets by following hypernym/hyponym relations. Synsets can be retrieved using various methods, from simple string matching to complex Xpath expressions, either predefined or specified by the user. For instance, by means of the Xpath expression ...

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... optimal water content Wop = 15.6%). A comparison between the results of California Bearing Ratio (CBR) research on stat- ic (classic) and dynamic methods with ash samples in the unsaturated state has been presented [5], and the correlations of the parameters of the laboratory dynamic California Bearing ...
    ... certain correlations with the parameters obtained by standard procedures were observed and can be used to solve practical tasks. Materials and Methods All tests were performed on natural gravel material sampled at a temporary landfill at 'Batajnica Inter- modal Terminal in Belgrade. The same material ...
    ... their respective co- efficient of determination (r?) and standard error. Notably, the parameters (E,,—Ey>, E,q) obtained from the refer- ence test methods were used as dependent variables in the obtained regression model, while the CBRy,, parameter obtained by testing with the CBR, device was used ...

  • Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules

    Svetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón (2024)
    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 analiza

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... Grs58–64Adr36–42Sps2 sample from Meka Presedla (Kopaonik Mt.) with optical micro- scopy, electron microprobe analysis (EMPA), and FT–IR and Raman methods. It is entirely slightly anisotropic and without presence of isotropic areas, which was primarily caused by its non-cubic structural dissymmetrization ...
    ... grandite patterns in skarn samples SN-310 from the borehole coordinates (44.125887°N, 20.507926°E), applying optical microscopy, EMPA and LA-ICP-MS methods, with the aim of constraining hydrothermal system evolution. The observed trend of the REE in garnet is useful for understanding the mechanisms ...
    ... NW and SE of Rudnik. Miocene sedimentary rocks show metamorphic alteration only in the zones of direct contact with volcanic rocks. Analytical methods Major elements were obtained by EMPA using a JEOL 6610 LV electron microprobe equipped with wavelength- dispersive spectrometer (Oxford Instruments ...

  • Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina

    Tina Dašić, Ljiljana Vasić (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary Change

  • Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy

    Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana (2021)
    ... References DJORDJEVIĆ, B. (2013): In: Lugli, F., Stoppiello, A. A. & Biagetti, S. (Eds.): Ethnoarchaeology: Current research and field methods. Conference Proceedings, Rome, Italy. BAR International Series 2472, 49–52. MILOŠEVIĆ, M., DABIĆ, P., KOVAČ, S., KALUĐEROVIĆ, L. & LOGAR, M ...

  • FTIR Spectroscopic Study Of S-Metolachlor Sorption On Inorganic And Organically Modified Montmorillonite From Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... problems related to the use of herbicides are a causing concern due to their increasing presence in soil, groundwater and surface water. Numerous methods are developed in order to reduce herbicide mobility and protect natural water resources. The results presented in this paper show the interaction ...

  • Утицај обртног магнетног поља на дерацемизацију кристала натријум-хлората

    М. Милојевић, А. Жекић, П. Дабић, Б. Вучетић, Б. Максимовић (2023)
    ... )ff.bg.ac.rs Viedma ripening [1], application of ultrasonic waves [2], addition of impurities [3] and temperature changes [4] are some of the methods of deracemization of crystals grown from aqueous solutions. This paper will present the results of the influence of a rotating magnetic field on ...

  • Процјена хазарда и ризика од клизишта за различите нивое просторног планирања у Републици Српској, БиХ

    Цвјетко С. Сандић (2022)
    Територија Републике Српске је у посљедних десетак година веома угрожена активирањем нових и реактивирањем старих клизишта. Она својим дјеловањем наносе огромне материјалне штете, па и људске жртве, те је неопходно озбиљније третирање и дјеловање у борби са овим природним хазардом. Чест проблем јесте одговорност, тј. надлежност институција из ове области и недостатак у законској регулативи која готово никако или само површно обрађује област хазарда и ризика од клизишта. Усљед непостојања праксе и усвојених методологија које су у примјени у свијету, циљ ...
    Kлизишта, склоност, хазард, ризик, процјена, просторно планирање, угроженост

  • Primena AHP и WoEmetode u proceni podložnosti terena na kliženje za područje opštine Krupanj

    Biljana Abolmasov, Jelka Krušić, Katarina Andrejev, Miloš Marjanović, Ranka Stanković, Uroš Đurić (2017)
    ... kliženje (landslide suscep- PRIMENA AHP I WoE�METODE�U�PROCENI�PODLOŽNOSTI� TERENA�NA�KLIŽENJE�ZA�PODRUČJE�OPŠTINE�KRUPANJ APPLICATION OF AHP AND WoE METHODS FOR LANDSLIDE SUSCEPTIBILITY ASSESSMENT ON KRUPANJ MUNICIPALITY UDK: 551.435.62(497.11) Originalni naučni rad V. prof. dr Biljana ABOLMASOV, dipl ...
    ... SUMMARY This paper is an example of landslide susceptibility assessment in Krupanj municipality in western Serbia, using two different multicriteria methods: Analytical Hierarchy Process (AHP) and Weight of Evidence (WoE). AHP is based on quantified expert judgement on the individual importance of co ...
    ... Geomorphology 86, pp.12-24, 2007. [22] Ozdemir A, Altural T. A comparative study of frequency ratio, weights of evidence and logistic regression methods for landslide susceptibility ma- pping: Sultan Mountains, SW Turkey. Journal of Asian Earth Sciences 64, pp.180-197, 2013. [23] Regmi NR, Giardino ...

  • Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta

    Vesna Cvetkov (2020)
    ... Detection of Total Field Archaeomagnetic Data- sets. Archaeological Prospection 18 2: 81-93. Clark, A. 1990. Seeing Beneath the Soil: Prospecting Methods in Archaeology. London: Routledge. Conyers, L.B., Goodman, D. 1997. Ground-penetrating radar. An introdu- ction for archaeologists.Walnut, Creek ...
    ... on-to-the-pole at low latitudes: Obser- vations and considerations. The Leading Edge: 990-1002. Linford, N. 2006. The application of geophysical methods to archaeological prospection. Rep. Prog. Phys. 69: 2205- 2257. Linford, N., Canti, M.G., 2001. Geop- hysical evidence for fires in antiquity: preliminar ...
    ... 2D Frequency Domain Processing of Potential Field Data, Extension for Oa- sis montaj Tutorial. Geosoft. Wynn, J. 1986. A review of geophysical methods used in archaeology. Geoarcha- eology, 1, 3: 245-257. Witten, A. Handbook of Geophysics and Archaeology. Equinox Publishing, Lon- don. Weston, ...

  • INVENTS: A Hybrid Mine Ventilation Planning and Design System

    Lilić Nikola, Stanković Ranka, Obradović Ivan (2013)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    hybrid systems, mine ventilation, expert systems
    ... such as ResNet, SimVent and VENTEX (Figure 3). These packages integrate both well known numerical optimization and various artificial intelligence methods which allow for an introduction heuristics into the knowledge base, thus upgrading existing mathematical models with knowledge acquired through ...
    ... proposed in this paper with the object as the modular unit of the system. Objects consist of attributes (structures representing their internal data), methods (procedural components), and rules (declarative components). Fig. 9. VENTEX objects, instance editor and goal editor The object/attribute approach ...

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... surface breakout point and ore body access points. Brazil et al. created a software tool called Decline Optimization Toll (DOT). The heuristic methods used in DOT1 are replaced in the new version of the software tool, DOT2, by a method based on an understanding of exact solutions to a constrained ...
    ... values of the design parameters. 3. BRIEF DESCRIPTION OF GENETIC ALGORITHM (GA) Genetic algorithms are stochastic techniques whose search methods model a natural evolution. The genetic algorithms start with randomly chosen parent chromosomes from the search space to create a population. They ...

  • INVENTS: a hybrid system for subsurface ventilation analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    ... such as ResNet, SimVent and VENTEX (Figure 3). These packages integrate both well known numerical optimization and various artificial intelligence methods which allow for an introduction heuristics into the knowledge base, thus upgrading existing mathematical models with knowledge acquired through ...
    ... proposed in this paper with the object as the modular unit of the system. Objects consist of attributes (structures representing their internal data), methods (procedural components), and rules (declarative components). Fig. 9. VENTEX objects, instance editor and goal editor The object/attribute approach ...

  • Why classical sequence stratigraphy doesn't work in Pannonian basin?

    Dejan Radivojević (2018)
    basen iza ostrvskog luka, detačment, miocen, Panonski basen, riftogeneza, sekvenciona stratigrafija
    ... in constant rise or stand combined  with high sedimentation rate led to deposition of aggradational to progradational sequences.    MATERIAL AND METHODS    The regional composite seismic transect (figure 1) with length of more than 260 km at which rift  sequence stratigraphy method is demonstrated ...
    ... in well  logs,  core,  and  outcrops:  concepts  for  highresolution  correlation  of  time  and  facies,  American  Association of Petroleum Geologists Methods in Exploration Series, 7, 55 pp.   Weimer, P., Posamentier, H.W. (Eds.), 1993. Siliciclastic Sequence Stratigraphy. AAPG Memoir 8, p. 292.    ...