Претрага
2665 items
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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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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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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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A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)
... and hydrogeologic exploration, and analysis and synthesis of the collected data, the paper describes hydrogeologic modeling of the open-cast mine Tamnava – West Field. The software used in the research provides a portrayal of the 3D distribution of the aquifers present in the study area. As such ...
... from: http://www.astm.org/DATABASE.CART/WITHDRAWN/D5447.htm [Acessed 23/11/16]. ŠUBARANOVIĆ, T., PAVLOVIĆ, V. and POLOMČIĆ, D. (2013) Influence on environment of sealing screen at lignite opencast mines. Metalurgia International, 18 (5), pp. 169-175. WELS, C., FERGUSON, P.R. and FAWCETT, M. (2012) ...
... and hydrogeologic parameters of the porous medium, followed by specifying initial and boundary conditions and selecting the numerical method to be applied (Krešić, 2006; Krešić and Mikszewski, 2012). 4. RESULTS The software used in this research, to create the conceptual hydrogeologic model, was ...Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin. "A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)" in Underground Mining Engineering no. 29, Belgrade : University of Belgrade - Faculty of mining and geology (2016): 43-54
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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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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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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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Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils
Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii... Gunko, Y.K. Synthesis of CaCO3 nano- and micro-particles by dry ice carbonation. Chem. Commun. 2017, 53, 6657–6660. [CrossRef] [PubMed] 58. Qian, M.; Zuo, Y.; Chen, Z.; Yin, X.; Liu, Y.; Yang, W.; Chen, Y. Crystallization of CaCO3 in aqueous solutions with extremely high concentrations of NaCl. Crystals ...
... evaluation of ureolysis and reduction in calcium ions were presented using a nonlinear regression method using the Solver function in Microsoft Excel 2019. Microorganisms 2021, 9, 1691 6 of 20 2.5.2. Determination of Calcium Concentration The sterile filtration (filter pore 0.22 µm) of supernatant ...
... for each selected process parameter (amount of precipitate, pH monitoring, calcium concentration). The described behavior is similar for all tested bacteria, which can suggest that the kinetic of ureolysis has a great influence on the MICP process, regardless of the ureolytic bacterial strain. Table 1 also ...Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov. "Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils" in Microorganisms, MDPI AG (2021). https://doi.org/10.3390/microorganisms9081691
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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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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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Landslide Susceptibility Modeling Using Arbitary Polinomal Method
Peševski Igor, Jovanovski Milorad, Abolmasov Biljana. "Landslide Susceptibility Modeling Using Arbitary Polinomal Method" in Procedings of 2nd Regional Symposium on Landslides in the Adriatic-Balkan Region - 2nd ReSyLAB 2015 1, Beograd:Rudarsko-geološki fakultet Univerziteta u Beogradu (2017): 137-142
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Defining location and dip of magnetic anomaly sources applying mathematical transformation
It is significant to define the location and dip of anomaly sources during the geophysical exploration (magnetic, gravity, electric, seismic, etc.). In this paper we presented results obtained during magnetic survey. Applying different method of mathematical transformations on magnetic data we can find the position (edge) and dip of magnetic anomaly sources. For successful solution of this problem, we used combination two method tilt derivative and upward continuation. The study area located in the eastern Serbia, north part of ...Snežana Ignjatović, Milanka Negovanović. "Defining location and dip of magnetic anomaly sources applying mathematical transformation" in 53nd International October Conference on Mining and Metallurgy, IOC 2022, Bor, 3-5. oktobar 2022., Mining and Metallurgy Institute Bor (2022)
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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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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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Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides
... measure the efficiency of inorganic and organic modified montmorillonites for the sorption of the S-metolachlor. Mineralogical characterization of natural clay samples was performed using the X-ray diffraction method. This method was also used in order to track structural ...
... different concentrations of two organic complexes (HDTMA, PTMA). Chemical analysis of the sample showed that natural montmorillonite from Bogovina (Serbia) was Ca montmorillonite. The whole modification process was monitored using several methods. The batch adsorption method was used to measure ...
... from the environment. The efficiency of the sorption of S-metolachlor by montmorillonite depends on the size of the interlayer space, the type of interchangeable cation, and also on the characteristics of the montmorillonite surface. Disclosure of Interest: None Declared Keywords: ...Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević. "Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides" in Eurosoil2020, online event 2021, Eurosoil, Frontiers Abstract Book (2021)
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Effect of natural gas composition on methane number: A case of gas reservoirs in Serbia
Natural gas is considered as the most environmentally acceptable fossil fuel, thus it is an alternative to petroleum derivate, dominantly used in internal combustion engines. Physical properties of a fuel as well as behavior during combustion process are affected by its composition. This article presents analysis of effect of natural gas composition on methane number (MN), conducted for natural gas deposits in Serbia. For empirically determination of MN: California air resources board (CARB) method and Linear and Anstalt für ...Marija Živković, Milica Ivić, Dejan Ivezić, Aleksandar Madžarević. "Effect of natural gas composition on methane number: A case of gas reservoirs in Serbia" in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects (2017). https://doi.org/10.1080/15567036.2017.1403518
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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)
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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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A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia
When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...... ical concerns do exist and are related to different aspects of each RES. For the socio-political criterion of using RESs in Serbia, experts’ judgments are implemented here, due to a lack of appropriate indicators to reflect the influence of each RES on the social and political dimension in Serbia. Therefore ...
... concepts of fuzzy set theory and hierarchical structure analysis, typical for the AHP method. The model for prioritizing RESs for energy generation first divides the objective of the research into a hierarchy. The top-level in the hierarchy is the objective of the research which is ‘‘Identification of renewable ...
... In the case of assessment of the RESs regarding the socio- political criterion (C4), the collected experts’ judgments are also aggregated by using the geometrical mean (GM) method (Eq. (1)), with the assumption that the experts’ judgments are of equal im- portance. After the results of prioritization ...Boban Pavlović, Dejan Ivezić, Marija Živković. "A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia" in Energy Reports, Elsevier BV (2021). https://doi.org/10.1016/j.egyr.2021.02.072