Претрага
3552 items
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Побољшање ефикасности одлучивања у рударству применом линеарних оптимизационих модела
Трајче Бошевски (2021)Одлучивање и управљање у рударству је захтеван и сложен задатак изложен ризицима. Конвенционални-искуствени приступи доношења одлука, у пракси често показују слабост која се огледа у недовољној поузданости и прецизности. Предмет истраживања докторске дисертације, под називом „Побољшање ефикасности одлучивања у рударству применом линеарних оптимизационих модела“ је да, сагледавањем научних метода линеарног програмирања, приступи формирању локацијских модела који би били засновани на анализи и прилагођавању постојећих и увођењу нових претпоставки за случајеве као што је експлоатација и потрошња кречњака. У дисертацији ...Трајче Бошевски. Побољшање ефикасности одлучивања у рударству применом линеарних оптимизационих модела, [Т. Бошевски], 2021
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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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A tool for identifying the criticality in the disordered systems with metastable dynamics
Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević. "A tool for identifying the criticality in the disordered systems with metastable dynamics" in Physica A: Statistical Mechanics and its Applications, Elsevier BV (2021). https://doi.org/10.1016/j.physa.2021.125883
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Preliminary regional landslide susceptibility assessment using limited data
Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...... ity model. Extraction of a particular land- slide conditioning parameter and repetition of the validation pro- cess is one approach to test model sensitivity (LEE & TALIB, 2005; GUZZETTI et al., 2006). Other approaches for testing the sensitivity of a particular landslide susceptibility model (and ...
... 77 % of the total landslides mapped. A landslide susceptibility model with the lowest percent of landslides in classes with very high and high susceptibility is the WAP-TLSR-100. According to this model 58.75% of the region’s Model Susceptibility class Value of W-TLSR Area (km2) Area (%) ...
... Total Landslide Susceptibility Rating (TLSR) model is obtained by summing the individual rating points of each parameter and divid- ing the region into five susceptibility zones according to Jenks natural breaks classification. Ver- ification of the TLSR model is then performed by overlaying the landslide ...Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska. "Preliminary regional landslide susceptibility assessment using limited data" in Geologica Croatica , Croatian Geological Society (2019). https://doi.org/10.4154/gc.2019.03
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Improving efficiency of thermal power plants through mine coal quality planning and control
Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja. "Improving efficiency of thermal power plants through mine coal quality planning and control" in Thermal Science, Vinča Institute of Nuclear Sciences (2018). https://doi.org/10.2298/TSCI170605209B
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Hybrid Model for Optimisation of Waste Dump Design and Site Selection in Open Pit Mining
Aleksandar Doderovic, Svetozar-Milan Doderovic, Sasa Stepanovic, Mirjana Bankovic, Dejan Stevanovic (2023)Waste management is an unavoidable technological operation in the process of raw material extraction. The main characteristic of this technological operation is the handling of large quantities of waste material, which can amount to several hundred million cubic metres. At the same time, this operation must comply with all administrative and environmental standards. Therefore, optimising waste rock management (particularly haulage and dumping) has the potential to significantly improve the overall value of the project. This paper presents a hybrid ...Aleksandar Doderovic, Svetozar-Milan Doderovic, Sasa Stepanovic, Mirjana Bankovic, Dejan Stevanovic. "Hybrid Model for Optimisation of Waste Dump Design and Site Selection in Open Pit Mining" in Minerals, MDPI AG (2023). https://doi.org/10.3390/min13111401
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Application of stochastic models for mine planning and coal quality control
... rameter. Slave parameter for homogenization is coal heating value. The integral model for coal quality control is developed and consists of three sub-models: operational mine scheduling model, stocking model and reclaiming model, fig. 5. According simulated daily or shift mine plan each BWE has working ...
... This model, in general, is based on predicted information about the in-situ quality of the coal deposit. Consequently, production scheduling for the purpose of controlling coal quality, e. g., sulfur, have to be based on the predicted data of the contemplated mining benches. The model uses zero-one ...
... within pile, fig. 2. The shadings of layer's cross-sections in fig. 2 are corresponding to the percentage of sulfur. The reclaiming model Developed reclaiming model determines the tonnage of coal to be loaded from stockyard piles by reclaimer, so that the total sulfur con- tent of the reclaimed ...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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Development and evaluation of fracture gradient curve model: a case study of south-central Kazakhstan
An accurate fracture gradient value is one of the most important issues in oil and gas well design and drilling. The value of a fracture gradient is a critical parameter for determining the drilling mud weight and selecting the proper depths for setting the casing in the planning process of drilling operations. This paper proposed the new curve model of fracture gradient for the south-central Kazakhstan (central Asia) region based on the analysis of leak-off test and format integrity ...Branimir Stanisavljevic, Vesna Karovic Maricic, Irena Isakov. "Development and evaluation of fracture gradient curve model: a case study of south-central Kazakhstan" in International Journal of Oil, Gas and Coal Technology, Inderscience Publishers (2022). https://doi.org/10.1504/IJOGCT.2023.128042
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Termička zrelost organske supstance i naftno-matični potencijal istočne Hercegovine
Nikoleta Aleksić (2021)Cilj istraživanja, obrade i interpretacije rezultata prikazanih u disertaciji je utvrđivanje termičke zrelosti organske supstance i naftno-matičnog potencijala sedimentnih stena na području istočne Hercegovine, primenom metoda pirolize Rock-Eval, organo-petrografskog proučavanja organske supstance u normalnoj svetlosti i fluorescenciji, koja je pored kvalitativne analize uključila posebno i refleksiju vitrinita. Osim toga, na osnovu organsko-geohemijskih analiza sagledane su karakteristike i poreklo ekstrahovanog bitumena metodom gasne hromatografije - masene spektrometrije, pri čemu su izvršene analize biomarkera kao geohemijskih indikatora. Tokom rada na doktorskoj ...organska supstanca, termička zrelost, matične stene, naftni potencijal, refleksija vitrinita, piroliza Rock-Eval, biomarkeri, Karbonatna platforma, istočna HercegovinaNikoleta Aleksić. Termička zrelost organske supstance i naftno-matični potencijal istočne Hercegovine, Beograd : [N. Aleksić], 2021
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Production information system of the Pljevlja coal mine
Božo Kolonja, Ranka Stanković, Filip Vuković . "Production information system of the Pljevlja coal mine" in Mine Planning and Equipment Selection 2000, Routledge (2018). https://doi.org/10.1201/9780203747124-154
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Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine
Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...... Unlike the conventional model, the final grade can be divided into several outcomes. The synthesis was made using the fuzzy theory and the AHP ranking model. The model is illustrated using the example of the bulldozer. Verification was made by comparing the results of the new model and the conventional ...
... intensity of the same. The model can be used as a simple tool in asset management in the sense of machine comparison and weak point analysis [18]. The model will be illustrated with the example of auxiliary machinery working in EPS (Electric Power Industry of Serbia) mines. The model will be verified by using ...
... synthesis model is represented through the fuzzy inference model where inputs are represented with fuzzificated estimates of partial indicators, and the rules of fuzzy composition are defined through outcomes that are corrected on the basis of ranks. 2.2.1. Fuzzy Inference in the Synthesis Model Availability ...Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović. "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine" in Energies, MDPI AG (2019). https://doi.org/10.3390/en12214044
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Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings
... 15 of 18 Model 2 v2 = 50.4220R−1.3730 (56) Model 3 Table 6 shows the data for calculating the parameters of rock masses oscillation equation in Nepričava open pit according to Model 3. Table 6. Representation of data for calculating the parameters in Nepričava open pit according to Model 3. Ri xi ...
... values obtained by experimental measurements. 3.3.1. Model 1—Determining the Parameters by Applying the Least Square Method The Least Square Method is mainly used to obtain the parameters K and n which represents a common model [9,10]. 3.3.2. Model 2—Determining the Parameters through the Application ...
... n of rock masses oscillation velocity in Majdanpek open pit. Model 2 v2 = 158.5234R−1.8568 (45) Model 3 Table 2 shows the data for calculating the parameters of rock masses oscillation equation in Majdanpek open pit according to Model 3. Minerals 2018, 8,70 10 of 18 Table 1. Survey of blasting ...Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić. "Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings" in Minerals, Basel : MDPI AG, Basel, Switzerland (2018). https://doi.org/10.3390/min8020070
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Sistem poslovne inteligencije za upravljanje zaštitom na radu u rudarskoj industriji
Ljiljana R. Kolonja (2016-09-23)Postojeća organizacija zaštite na radu na površinskim kopovima uglja često nije umogućnosti da blagovremeno i tačno ukaže na nedostatke, koji mogu u bližoj ilidaljoj budućnosti da budu uzrok narušavanja bezbednosti radnika, ali i uzrokoštećenja materijalnih dobara rudnika. Nemogućnost donošenja pravovremenihodluka je moguće izbeći uvođenjem softverski podržanih sistema za praćenje ianalizu bezbednosti i zaštite na radu.Osnovni cilj ove doktorske disertacije je definisanje metodologije i razvoj modelasistema upravljanja zaštitom na radu, koji će omogućiti savremen, adekvatan isveobuhvatan način praćenja i analize ...... razumevanja, modeli se prikazuju dijagramima u kojima su komponente i objekti sistema, kao i njihove veze prikazani grafičkim simbolima. Za potpuni opis modela, uz vizuelni prikaz je neophodno da se neke informacije u modelu izraze tekstom. Najvažnija svojstva dobrog modela su; tačnost ...
... ............................... 84 Slika 6.9. Model baze podataka: tabele programskog sistema zaštite ........................... 85 Slika 6.10. Model podataka podsistema o ljudskim resursima ......................................... 86 Slika 6.11. Model podataka podsistema o povredama ............. ...
... ju zahteva za razvoj sistema, opis konceptualnog modela programskog sistema i opis modela baze podataka, prikaz 11 komponenti softvera i analitičkih servisa poslovne inteligencije razvijenog sistema kao i verifikaciju razvijenog modela. Sedmo poglavlje prikazuje značaj korišćenja primene ...Ljiljana R. Kolonja. "Sistem poslovne inteligencije za upravljanje zaštitom na radu u rudarskoj industriji" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-09-23)
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Modeliranje i simulacija energetske tranzicije u sektoru domaćinstava
Boban S. Pavlović (2022)Aktuelnu energetsku tranziciju odlikuje ubrzanje procesa dekarbonizacije energetskih sistema, unapređenje energetske efikasnosti, razvoj čistijih tehnologija baziranih na obnovljivim izvorima energije i održivije korišćenje prirodnih resursa. Da bi se napravio ovako krupan zaokret u postojećim energetskim sistemima, osim promene postojećih tehnologija, potrebno je u planiranje energetske tranzicije uključiti i političke, sociološke, ekonomske i ekološke aspekte, a pre svega obrasce ponašanja i donošenja odluka krajnjih potrošača. Predmet istraživanja u disertaciji je energetska tranzicija sektora domaćinstva, preciznije tranzicija u grejanju domaćinstava, imajući u ...energetika, energetska tranzicija, energetsko planiranje, energetsko modeliranje, obnovljivi izvori energije, domaćinstva, ponašanje potrošačaBoban S. Pavlović. Modeliranje i simulacija energetske tranzicije u sektoru domaćinstava, Beograd : [B. Pavlović], 2022
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From DELA Based Dictionary to Leximirka Lexical Database
Biljana Lazić, Mihailo Škorić (2020)In this paper, we will present an approach in transforming Serbian language Morphological dictionaries from a DELA text format to a lexical database dubbed Leximirka. Considering the benefits of storing data within a database when compared to storing them in textual documents, we will outline some of the functionality that the database has made possible. We will also show how hand-made rules that use category labels lexical entries are marked with can be used to link lexical entries. ...... adequate markers. 3.2 Leximirka’s lexicographic database model The lexicographic database model of Leximirka, shown in Figure 1, is guided by the Lemon, LMF and Data Category Registry catalog (Stanković et al., 2018). The implemented model provides the ability to store lexico- graphic information ...
... lexicographic database and to an online application. In Sections 3.2 and 3.3 we will give a description of Leximirka’s lexicographic database model and data categories model. An overview of the application segments will be provided in Section 4.1. The possibilities for establishing relations among lexical entries ...
... ontologies (e.g. by defining morphological categories and synsets) (McCrae et al., 2012). The Lemon model is concise, descriptive, modular and RDF based. At the time of making Leximirka database, Lemon model consisted of five modules: Ontology-lexicon interface – ontolex, Syntax and Semantics – synsem, De- ...Biljana Lazić, Mihailo Škorić. "From DELA Based Dictionary to Leximirka Lexical Database" in Infotheca, Faculty of Philology, University of Belgrade (2020). https://doi.org/10.18485/infotheca.2019.19.2.4
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Modeliranje sistema upravljanja zaštitom životne sredine u rudarsko-energetskim kompleksima
Jelena R. Malenović - Nikolić (2016-07-12)Efikasnost funkcionisanja sistema upravljanja zaštitom životne sredine u rudarskoenergetskimkompleksima zavisi od stepena sprovođenja usvojene politike zaštiteživotne sredine i primene preventivnih mera zaštite životne sredine. Nedostatakfinansijskih sredstava za unapređivanje tehnologije eksploatacije, transporta, pripreme iprerade energetskih mineralnih sirovina u našim rudarsko-energetskim kompleksima,negativno utiče na ostvarivanje ciljeva zaštite životne sredine, a posledice radnihaktivnosti rudarsko-energetskih kompleksa dovode do smanjenja nivoa kvalitetavazduha, vode i zemljišta...rudarsko-energetski kompleks, životna sredina, sistem upravljanja,višekriterijumsko odlučivanje, modeliranje... Environments, International Journal of business Excellence 3, 2010, DOI:10.1504 224. Hudej, M., Multivarijabilni modeli upravljanja u rudarstvu, Doktorska disertacija, Rudarsko-geološki fakultet, Beograd, 2013 225. Nacionalna strategija održivog korišćenja prirodnih resursa i dobara, Službeni glasnik ...
... (IFS), model energetskog sistema Evropske unije (model prostih brojeva), model analize ulaza i izlaza (Input – output analiza), Azijsko-pacifički integrisani model (AIM), model za analizu primene Kjoto protokola (DNE 21 +), model integrisane procene globalnih klimatskih promena (MERGE), model analize ...
... primenjivani modeli su: model simulacije regionalnog zagađenja vazduha (KIŠE), modeli za praćenje klimatskih promena (ECHAM i HADCM), model za ocenu kvaliteta i dostupnosti vodnih resursa (VATERGAP), model za ocenu uticaja društveno-ekonomskih kretanja na kvalitet zemljišta (CLUE), model za ocenu ...Jelena R. Malenović - Nikolić. "Modeliranje sistema upravljanja zaštitom životne sredine u rudarsko-energetskim kompleksima" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-07-12)
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Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides
Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)... strains. There- fore, we use the logarithmic principal stretches to determine the average strain type during model evolution (see Supplementary Appendix B, E; see also Broerse et al., 2021). While in 3D, faulting always involves shear on fault planes, in horizontal view only strike-slip faulting is a purely ...
... divided in separate periods. Finally, these results are combined with visual interpretations of cross-sections to infer 2D strain in the entire, 3D model. 3.5. Experimental limitations and simplification The analogue models presented in this study do not account for isostasy, temperature gradients ...
... deformation. 4.1. Reference model: model 1 Model 1 consists of a rigid indenter with rounded corners, while the surrounding, deformable material is entirely brittle (Table 1, Fig. 2a, e). Deformation results only from northward translation of the model layers. Model 1 (Fig. 3) documents the development ...Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović. "Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides" in Journal of Structural Geology, Elsevier BV (2021). https://doi.org/10.1016/j.jsg.2021.104386
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Оцена перспективности изворишта "Вић баре" за водоснабдевање Обреновца
... neracionaina potrosnja u letnjem periodu. Proteklih godina izvedena su hidrogeoloska istrazivanja kojima su prikupljeni podaci za izradu hidrodinamiékog modela izvorista. Odredene su rezerve podzemnih voda na izvoristu, a simulacijama rada izvorista kvantifikovane su vrednosti koli€éina podzemnih voda za sluéaj ...
... Belgrade) and plan to connect smaller settlements to the main waterworks system have initiated hydrogeological research and creation of hydrodynamical model of the exisiting source ,,Vié bare“ located in Sava River alluvium. The source consists of 30 vertical drilled wells and the two collector wells (with ...
... which are the main recharge source, and nevertheless current losses in water distribution system (over 40%). Simulations made on created hydrodynamical model confirmed that no additional amount of groundwater could be pumped at that source without serious drawdown and negative environmental consequences. ...Бојан Хајдин, Душан Поломчић, Зоран Стевановић, Драгољуб Бајић, Катарина Хајдин. "Оцена перспективности изворишта "Вић баре" за водоснабдевање Обреновца" in XIV Српски симпозијум о хидрогеологији са међународним учешћем, Рударско-геолошки факултет, Београд (2012)
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Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems
Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević. "Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems" in Physical Review E, American Physical Society (APS) (2019). https://doi.org/10.1103/PhysRevE.100.032113
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Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin
Dušan Polomčić, Bojan Hajdin, Marina Ćuk, Petar Papić, Zoran Stevanović. "Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin" in Carpathian Journal of Earth and Environmental Sciences (2014)