Претрага
2847 items
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A Method for defining the boundaries of an open pit according to the surface
Hristov Stojan, Dimitrijević Bojan (2011)Hristov Stojan, Dimitrijević Bojan. "A Method for defining the boundaries of an open pit according to the surface" in Zbornik radova 5. Međunarodna konferencija UGALj 2011 no. V, Златибор, Србија :Jugoslovenski Komitet za površinsku eksploataciju Saveza inženjera rudarstva i geologije Srbije (2011): 79-88
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Determination of oxygen surface groups on biochars using Boehm-titration method
Krstić D. Aleksandar, Lolić Đ. Aleksandar, Ilić Marija, Mijatović Aleksandar, Zlatanović J. Snežana, Nedić P. Zoran, Pavelkić M. Vesna (2015)Krstić D. Aleksandar, Lolić Đ. Aleksandar, Ilić Marija, Mijatović Aleksandar, Zlatanović J. Snežana, Nedić P. Zoran, Pavelkić M. Vesna. "Determination of oxygen surface groups on biochars using Boehm-titration method" in 52. savetovanje Srpskog hemijskog društva, Belgrade, Serbia (2015): 16
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Case Study of Ventilation Method Development for Bar-Boljare Highway Tunnel Construction in Montenegro
Cvjetić Aleksandar, Lilić Nikola, Čokorilo Vojin, Milisavljević Vladimir. "Case Study of Ventilation Method Development for Bar-Boljare Highway Tunnel Construction in Montenegro" in Tehnika LXXII no. 5, Beograd:Savez Inžinjera i Tehničara Srbije (2017): 667-674
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A new analytical method for determination of discharge duration in tunnels subjected to groundwater inrush
Mohsen Golian, Ebrahim Sharifi Teshnizi, Mario Parise, Josip Terzić, Sasa Milanović, Vesna Ristić Vakanjac, Masoud Mahdad, Mehdi Abbasi, Hossein Taghikhani, Habib Saadat (2021)Mohsen Golian, Ebrahim Sharifi Teshnizi, Mario Parise, Josip Terzić, Sasa Milanović, Vesna Ristić Vakanjac, Masoud Mahdad, Mehdi Abbasi, Hossein Taghikhani, Habib Saadat. "A new analytical method for determination of discharge duration in tunnels subjected to groundwater inrush" in Bulletin of Engineering Geology and the Environment, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10064-021-02140-6
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Određivanje prostorne distribucije vrednosti hidrauličkih parametara izdani: primer površinskog kopa „Radljevo“
Najčešće se kalibracija hidrodinamičkih modela vršila manuelno - „probanjem“ sa različitim vrednostima hidrauličkih parametara i hidrauličkih karakteristika graničnih uslova. Ovakav način rada zahteva veliko znanje i iskustvo eksperta, pri čemu ostaje otvoreno pitanje da li dobijeno rešenje ima optimalan skup parametara. Primenom optimizacione metode, koja se zasniva na Gauss-Marquardt-Levenberg-ovom algoritmu, i PEST softvera, ...Dragoljub Bajić, Dušan Polomčić, Jelena Ratković, Predrag Pajić. "Određivanje prostorne distribucije vrednosti hidrauličkih parametara izdani: primer površinskog kopa „Radljevo“" in 9. Međunarodni simpozijum o upravljanju podzemnim resursima, Zaječar 2019., Megatrend Univerzitet, Fakultet za menadžment, Zaječar (2019)
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Surface functional groups and degree of carbonization of selected chars from different processes and feedstock
Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS... analysis. Overall, the determination of the main and the inorganic elements ofthe chars yielded reli- able values. The results give an impression of the large variety of composition that can be found in chars of different origin and on the potential influence of extraneous material from the feedstock ...
... components on the spectroscopic properties of biochars. XPS is a powerful method for identifying functional groups and the degree of carbonization at the surface of biochar particles, but yields only semi-quantitative results regarding the large error of the method. It is also not clear what is the relevant ...
... Black (pyrogenic) carbon: a synthesis of current knowledge and uncertain- ties with special consideration of boreal regions. Biogeosciences. 2006; 3: 397—420. https://doi.org/ 10.5194/bg-3-397-2006. Biniak S, Szymanski G, Siedlewski J, Šwiatkowski A. The characterization of activated cabons with oxygen ...Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann. "Surface functional groups and degree of carbonization of selected chars from different processes and feedstock" in PLOS ONE (2022). https://doi.org/10.1371/journal.pone.0277365
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Application of Fuzzy Analytic Hierarchy Process to Underground Mining Method Selection
metode podzemne eksploatacije, znanje eksperta, višekriterijumsko odlučivanje, podzemna eksploatacijaSanja Bajić, Dragoljub Bajić, Branko Gluščević, Vesna Ristić Vakanjac. "Application of Fuzzy Analytic Hierarchy Process to Underground Mining Method Selection" in Symmetry (MDPI) (2020). https://doi.org/10.3390/sym12020192
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Application of MCDA in the determination of optimal block size for open-pit modelling and mine planning
The process of creating a geological block model as the basis for a further detailed design and planning of mining operations is a very responsible task. Errors made during this initial process are transferred to all other phases of the mining project. Certainly, one of the most important decisions for the modelling process is the choice of the appropriate size of the blocks that form the model itself. The determination of the optimal block size is not a simple ...dimenzije minibloka, višekriterijumska analiza, AHP, modeliranje ležišta, planiranje na površinskim kopovimaPetar Marković, Dejan Stevanović, Milica Pešić Georgiadis, Mirjana Banković. "Application of MCDA in the determination of optimal block size for open-pit modelling and mine planning" in Underground Mining Engineering, Univerzitet u Beogradu, Rudarsko-geološki fakultet (2021)
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Komparacija metoda XRF i ICP-MS na uzorcima uglja i produkata sagorevanja
Ugljevi niskog ranga – ligniti u Republici Srbiji predstavljaju glavnu energetsku sirovinu koja se koristi za proizvodnju električne energije. Rudarstvo u Srbiji doprinosi bruto dodatoj vrednosti sa 1,8% (2020; https://publikacije.stat.gov.rs/). Sagorevanjem ugljeva niskog ranga u termoelektranama generišu se velike količine elektrofilterskog pepela i pepela, koje često predstavljaju jedan od izvora zagađenja životne sredine usled sadržaja toksičnih elemenata. Dalja upotreba produkata sagorevanja zavisi od njihovog sastava i sadržaja toksičnih mikroelemenata. Svakodnevno sagorevanje lignita u termoelektranama uslovljava konstantan monitoring potencijalno toksičnih ...Branko Kostić, Dejan Prelević, Sabina Kovač, Ksenija Eraković, Dragana Životić. "Komparacija metoda XRF i ICP-MS na uzorcima uglja i produkata sagorevanja" in 18. Kongres geologa Srbije "Geologija rešava probleme", Divčibare, 01-04 jun 2022., Srpsko geološko društvo (2022)
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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 ...... — API Method — Wave Equation API method This method was developed in 1956 at the Research Institute of the city of Kansas in the USA by manufacturers and users of deep well pump equipment. It is more precise than the empirical method, with the main difference being that the API method takes ...
... system. If the production of fluid relies solely on the natural energy of the reservoir, this method of exploitation is called an eruptive method. When the reservoir energy is sufficiently depleted, so that the reservoir pressure is no longer enough to enable the flow of fluid through the well, ...
... this method for fluid extraction. The purpose of this paper is to introduce the basic components of the pump, its operation, and improvements to its performance through the application of a double-acting valve. The first part of the paper presents the underground and surface equipment of the rod ...Ana Ponoćko. Design of a sucker rod pumping system, 2024
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The Inner Aggregation Newton’s Method for Solving Nonlinear Equations
Nebojša M. Ralević, Dejan Ćebić, Bratislav Iričanin. "The Inner Aggregation Newton’s Method for Solving Nonlinear Equations" in Scientific Publications of the State University of Novi Pazar, Ser. A: Appl. Math. Inform. and Mech (2022)
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Classifying large strains from digital imagery: application to analogue models of lithosphere deformation
... (strike-slip) deformation or combinations of these. This method is based on a logarithmicmeasure of stretch and results agree well with the visual interpretation of structures that weobserve in our models. Thus, we provide tools with which the evolution of 2D tectonic deformationcan be interpreted in ...
... to specific material points. Byreconstructing the path of material, we can follow small regions of material while they translate,rotate and change shape. To aid the qualitative interpretation of this deformation, we have developed a novel method thatcan qualitatively describe shape changes coming from ...
... in a physically meaningful manner, but our method may be useful outside therealm of tectonics. Our software to compute deformation is freely available and can be used topost-process incremental displacements from PIV or similar autocorrelation methods. Powered by TCPDF (www.tcpdf.org) http://www.tcpdf ...Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer. "Classifying large strains from digital imagery: application to analogue models of lithosphere deformation" in EGU General Assembly 2021, Vienna, Austria, 19.-30.4.2021., EGU (2021)
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New Approach to Equipment Quality Evaluation Method with Distinct Functions
Milisavljević Vladimir, Medenica Dragan, Čokorilo Vojin, Ristović Ivica. "New Approach to Equipment Quality Evaluation Method with Distinct Functions" in Thermal Science 20 no. 2, Belgrade, Serbia:Institut za nuklearne nauke “Vinča”/ Vinča Institute of Nuclear Sciences, UoB (2016): 743-752. https://doi.org/10.2298/TSCI150324142M
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Ground surface subsidence monitoring using sentinel-1 in the “Kostolac” open pit coal mine
Zoran Gojković, Milan Kilibarda, Ljiljana Brajović, Miloš Marjanović, Aleksandar Milutinović, Aleksandar Ganić (2023)Open pit coal mining affects surrounding populated areas, resulting in terrain surface deformation. Surface deformation should be monitored as often as possible to control deformations and prevent potential incidents. This paper analyzes time series deformation estimated from the Sentinel-1 satellite images using the Persistent Scatterer Interferometry method to monitor subsidence rates caused by open pit mining activities. It is possible to measure deformations using classical geodetic methods, but those are rarely used in practice because they are time-consuming and ...Zoran Gojković, Milan Kilibarda, Ljiljana Brajović, Miloš Marjanović, Aleksandar Milutinović, Aleksandar Ganić. "Ground surface subsidence monitoring using sentinel-1 in the “Kostolac” open pit coal mine" in Remote Sensing (2023). https://doi.org/10.3390/rs15102519
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Evaluation And Perspectives Of Underground Coal Mines In Serbia
... weights of the parameters in the solution of a multi-criteria problem. In the AHP method, a hierarchical model consisting of objectives, criteria, sub-criteria and alternatives is used for every problem [5]. Solving a problem using AHP is carried out using the weights or priorities of the criteria ...
... matrix (Table 5). While performing pairwise comparisons of criteria in the AHP method, a certain level of inconsistency may occur. Therefore, the logical consistency of pairwise comparisons must be checked [6]. To measure the consistency of pairwise comparison judgments, the consistency ratio proposed ...
... AHP method and scores allocated for each factor, the mines were ranked according to technical potential. Key words: Underground mining, Potential, Restructuring, Evaluation Introduction Serbia is one of the major coal producers in Europe, with over 38 Mt of coal per year. But most of this ...Vladimir Milisavljević, Milena Lekić, Ivica Ristović, Vojin Čokorilo, Aleksandar Cvjetić. "Evaluation And Perspectives Of Underground Coal Mines In Serbia" in 7th Balkan Mining Congress Preceedings - BalkanMine2017, Prijedor, 11-13. oktobar 2017., Banjaluka : University of Banjalika, Faculty of Mining, RS, BiH (2017)
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Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers
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... incorporation into the substrate layer; – the method of using a non-standardized dynamic California Bearing Ratio (CBR,) device and the defi- nitions of its values under laboratory and field conditions are proposed; – the values of the modulus of deformation of the pavement foundation layer (subgrade) ...
... The primary objective of this study was to establish reliable correlations between the selected param- eters of the gravel material so as to describe the compaction and bearing capacity of the substrate, and de- 32 velop a method of using and defining the values of a CBR, device. The following ...
... modulus (Ey„) values obtained by field tests. Owing to its speed and ease of use, CBR, testing can become widespread as an alternative to the clas- sic method of quality control in the process of compaction and estimation of the substrate bearing capac- ity. Additional research is required to establish ...Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović. "Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers" in Soil Mechanics and Foundation Engineering, Springer Science and Business Media LLC (2024). https://doi.org/10.1007/s11204-024-09939-x
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Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources
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 ...... discussed for six out of seven available indexing methods. Namely the results of the tfc tfc method were omitted as they were identical to the results of the tfc nfc method. The precision of the initial system is in general better among first-ranked documents than in the case of the improved system, with ...
... (queries). This set of queries has then been sorted in ascending order of the difference between the best per- forming ranking method for indexed documents InQuery and the performance of the initial method, and the results are depicted in Fig. 7. Fig. 7. Differences between initial method and InQuery indexing ...
... measures, where the InQuery method performed the best. 1 Introduction Advancements in database technology provide nowadays for management of large quantities of heterogeneous data. However, besides this engineering challenge— efficient management of such data, the “exploding world of Big Data” poses yet another ...Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović. "Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources" in Trans. Computational Collective Intelligence - Lecture Notes in Computer Science 26, Springer (2017). https://doi.org/10.1007/978-3-319-59268-8_8
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Multicriteria Analysis and Optimization of Groundwater Control Systems with Variable Values of Criterion over Predefined Time Points
Milica Stepanović, Dragoljub Bajić, Dušan Polomčić. "Multicriteria Analysis and Optimization of Groundwater Control Systems with Variable Values of Criterion over Predefined Time Points" in Comptes rendus de l'Académie Bulgare des Sciences, "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences (2021). https://doi.org/10.7546/CRABS.2021.08.09
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Development of integrated fuzzy model for mine management optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)... complexity of ore deposit structures, given that a large number of elements of the decision- making model are often uncertain and, in most cases, it is not possible to determine exact numerical values for comparing, decisions. The proposed method makes use of a logical approach of the expert to ...
... analysis, applying the FAHP method described in |*|. The optimization procedure and decision making; are presented in seven steps [12]. Step 1. Mathematical optimization begins with predefined criteria that affect the selection of one of several alternatives. Then a matrix of criterion X is con- C ...
... Information sciences, 8, 199—249. Š| CHANG D. Y. (1996) Applications of the extent analysis method on fuzzy AHP, Rur. J. Oper. Res., 95, 649 655. “} ZnU K., Y. JING, D. CHANG (1999) A discussion on extent analysis method and applications of fuzzy AHP, Eur. J. Oper. Res., 116, 450 456. TOLGA FE., M. DEMIRCAN ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of integrated fuzzy model for mine management optimization" in Comptes rendus de l'Académie Bulgare des Sciences (2023)
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Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines
The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković. "Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines" in 8th International Conference MIining And Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)