Претрага
562 items
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Innovative solution for the pump impeller shaft sealing
Batalović Veselin (2012)Batalović Veselin. "Innovative solution for the pump impeller shaft sealing" in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering November 2012 226 no. 4 (2012): 263-271. https://doi.org/10.1177/0954408911425886
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Energetska bezbednost sektora prirodnog gasa Srbije
U prve dve decenije 21. veka obezbeđivanje sigurnosti snabdevanja prirodnim gasom domaćeg tržišta bio je jedan od prioriteta razvoja energetike Srbije. Istovremeno, aspekt sigurnog snabdevanja bio je neizostavni deo slagalice stvaranja energetske bezbednosti. Izražena uvozna zavisnost je dominantna karakteristika sektora prirodnog gasa, tačnije, Republika Srbija je snažno zavisna od ruskog gasa, sa više od 80% uvezenih količina gasa, a do pre dve godine snabdevala se isključivo kroz jednu interkonekciju. U radu se razmatra aktuelna situacija u sektoru prirodnog ...... broja radova u međunarodno priznatim časopisima, učestvovao u izradi različitih studijai međunarodnih projekata. 36 International Congress on Process Industry Abstract Submission Form Note: Please, do fill the template in English. ABSTRACT Author/s Aleksandar Madžarević Predrag Jovančić ...
... aleksandar.madzarevicOrgf.bg.ac.rs (corresponding author only) predrag.jovancicO'rgf.bg.ac.rs miroslav.crnogorac(orgf.bg.ac.rs Conference topic Process technologies MG Energy Security of Serbian Natural Gas Sector Keywords (max. 5 words) Abstract In the first tvo decades of the 21st century ...
... about each enrolled at the Faculty of Mechanical Engineering, UB. He completed his author) undergraduate and graduate academic studies in the module Process Engineering and Environmental Protection in 2011. He finished his doctoral studies at the Faculty of Mining and Geology, UB, in the study program ...Aleksandar Madžarević, Predrag Jovančić, Miroslav Crnogorac. "Energetska bezbednost sektora prirodnog gasa Srbije" in 36. Međunarodni kongres o procesnoj industriji – Procesing ’23, Šabac, 1. i 2. juna 2023. , Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) Društvo za procesnu tehniku (2023)
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Утицај похабаности резних елемената роторног багера на ниво вибрација погона за копање
Филип Милетић (2023)У докторској дисертацији је анализиран утицај похабаности резних елемената роторног багера на потрошњу електричне енергије и ниво амплитуде вибрација погона за копање. Креиран је модел који у функцији стања резних елемената дефинише зависност разматраних физичких феномена. За развој модела примењене су једначине теорије осцилација и Ватметарска метода [1] којом се одређује потрошња електричне енергије. За верификацију модела извршена су мерења на роторном багеру SRs2000.32/5+VR ангажованом на откопавању откривке на површинском копу Тамнава–Западно поље. Обављено је пет мерења. Резни елементи су ...Филип Милетић. Утицај похабаности резних елемената роторног багера на ниво вибрација погона за копање, Београд : [Ф. Милетић], 2023
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Coal homogenization stockyard sizing “Tamnava – Zapad” case study
... autonomous piles. When the stockyard is connected with a port or commercial stockyard, every pile contains coal of consistent and known quality, and blending coals of various qualities produces the quality the customer demands. However, when the stockyard is connected with a mine (pit), it is used for ...
... pit. The common element in all considerations is selection of parameters whose variations have the greatest negative impact on the combustion process, whether because of combustion problems, or impact on the power plant equipment, or environmental impact. Although each parameter has a dominant ...
... The sulphur content is low, as is iron content, while mercury is monitored only sporadically. [Stevanović et al., 2015]. Thus the homogenization process is logically directed towards homogenization of heating value, as the primary parameter. At the pits operated by Mibrag (Germany) the leading ...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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Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia
... from each locality/site. Magnetic mineralogy experiments were carried out on selected specimens. The demagnetization curves were then analyzed for linear segments which were used for statistical evaluation on locality/site level. The fold/tilt test was carried out on locality (when applicable) and ...Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović. "Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia " in Environmental, Structural and Stratigraphical Evolution of the Western Carpathians, 11th ESSEWECA Conference, Geophysical Institute, Slovak Academy of Sciences Bratislava (2018)
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Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer
Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)... region has a moderate continental climate with an average annual air temperalure of 11'C and rainfall of 575 mm per year. The whole hydrographic network belongs to the river basin of the Biack Sea. It is assumed that about 99% of surface waters are water flows of a transitory nature, while only about ...
... proiect numerous activities were undertalnetwork, the creation of a GW initial database, common workshops and seminars for local capacity building, and water-saving promotional activities. As one ... Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić. "Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer" in Transboundary Water Resources Management - A Multidisciplinary Approach, Weinheim, Germany : Wiley-VCH (2011): 143-149
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Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise
Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín (2023)Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín. "Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise" in Science Advances, American Association for the Advancement of Science (AAAS) (2023). https://doi.org/10.1126/sciadv.adi2698
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Towards translation of educational resources using GIZA++
... with library that enables usage of Moses in the JavaScript language. Loading multiple translation systems into the same node process is provided. This means the same process can hold multiple distinctly different translation models (e.g., Chinese to English in IT and English to French in medicine) ...
... correlates with the segment in the original text. The task is thus to establish the connection between originals and their translations. In this process, segments are paired that sometimes represent whole sentences and sometimes just their parts, depending on the complexity of the sentence or the ...
... a virtual machine. It uses the Linux operating system. GIZA is quite a demanding tool, and it therefore requires extra resources. Its execution process requires a larger amount of RAM, which in our case was 16GB. Corpus Preparation For our research we used five text collections, three of them ...Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević. "Towards translation of educational resources using GIZA++" in The Seventh International Conference on e-Learning (eLearning-2016), September 2016, Belgrade : Metropolitan Univesity (2016)
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Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty
... 2015; Yavuz et al., 2006). Measuring method of ultrasonic waves velocity propagation is based on the modelling of the wave propagation process. The process of induction and wave emission is repeated 1 University of Belgrade – Faculty of ...
... for each special direction. The next part of calculation process describes investigation of anisotropy coefficient for each special sample and each special direction, respectively. It should be emphasized that the whole calculation process is covered applying interval numbers. Degree of anisotropy ...
... Uncertainty of input parameters implies defining a boundaries above these data thereby increasing the flexibility and reliability of the computational process. Comparative analysis between these samples shows a highly difference of quantitative indicators of anisotropy. Isotropic samples are more uniform ...Miloš Gligorić, Jelena Majstorović, Suzana Lutovac. "Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty" in Underground Mining Engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2018). https://doi.org/10.5937/PodRad1832001G
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Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking
Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović. "Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking" in X International Scientific Congress Innovations 2024, Varna, Bulgaria, SCIENTIFIC-TECHNICAL UNION OF MECHANICAL ENGINEERING - INDUSTRY 4.0 (2024)
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The external aggregation Newton's method for solving nonlinear equations and applications
Marija Paunović, Dejan Ćebić, Nebojša Ralević. "The external aggregation Newton's method for solving nonlinear equations and applications" in The University Thought - Publication in Natural Sciences, Centre for Evaluation in Education and Science (CEON/CEES) (2020). https://doi.org/10.5937/univtho10-24982
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Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy
... rims. Observed pores in sample 1 are of random orientation and size, indicating slower rotations of the potter’s wheel during the manufacturing process. Sample 2 has a specific fluid-structure that is consistent with the way it was fabricated. By the size and orientation of the pores, it is evident ...
... especially in the terms of elemental composition observed by EDS, to the distribution and appearance of pores concerning the manufacturing process. Further investigations are necessity for an establishment of the standards that will guarantee and protect the originality together with the ...Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana. "Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy" in 8th Mineral Sciences in the Carpathians Conference, Acta Mineralogica-Petrographica, Miskolc, Hungary, Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Szeged, Hungary (2021)
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Flyrock induced by blasting in surface mining
Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)Miniranje predstavlja i dalje najefikasniji i najjeftiniji način eksploatacije velikih količina čvrstih mineralnih sirovina na površinskim kopovima. Energija eksplozije se koristi za fragmentaciju čvrste stenske mase do zahtevane granulacije. Pored pozitivnih efekata miniranja, postoje i određeni neželjeni efekti svakog procesa miniranja koji se mogu javiti, a to su: potresi tla, razletanje komada stene, vazdušni udari, otrovni i zagušljivi gasovi i prašina. Razletanje komada stene je nekontrolisano izbacivanje fragmenata odminirane stenske mase i predstavlja jedan od glavnih izvora materijalne štete ...Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac. "Flyrock induced by blasting in surface mining" in Rudarski glasnik, Beograd : Rudarski institut (2022). https://doi.org/10.25075/BM.2022.05
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Investigating distant effects of the Moesian promontory: Brittle tectonics along the western boundary of the Getic unit (East Serbia)
In this study, we report evidence for brittle deformation in a part of the Carpatho–Balkan orogen, which is explained in terms of effects of the rigid Moesian promontory of the European plate on fault kinematics in East Serbia. We focus on the westernmost part of the Getic Unit of the East Serbian Carpatho–Balkanides, i.e. the Gornjak–Ravanica Unit, located between two main thrusts that were repeatedly activated from Early Cretaceous to recent times. We combine a new data set on ...Getikum, Mezijska jedinica, Karpato-balkanski orogen, krte deformacije, Gornjačko-ravanička jedinicaAna Mladenović, Milorad D. Antić, Branislav Trivić, Vladica Cvetković. "Investigating distant effects of the Moesian promontory: Brittle tectonics along the western boundary of the Getic unit (East Serbia)" in Swiss Journal of Geosciences, Springer (2019). https://doi.org/10.1007/s00015-018-0324-5
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Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine
Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić. "Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945617
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Ograničenja primene optimizacionih algoritama u slučaju kopova
Proces optimizacije površinskih kopova, kao sastavni deo strateškog planiranja, veoma je važan sa stanovišta ostvarivanja maksimalnih efekata proizvodnje. To je složen zadatak koji vrlo često podleže vrlo strogim geometrijskim i drugim praktičnim rudarskim ograničenjima. Ova ograničenja u posebno su izražena na površinskim kopovima uglja, te u značajnoj meri mogu povećati stepen neizvesnosti rudarskog projekta, odnosno izazvati neželjena dejstva u pogledu profitabilnosti poslovanja. Iz tog razloga, veoma je važna primena savremenih optimizacionih alata, koji u značajnoj meri mogu olakšati celokupan ...... optimalnih rešenja u okviru određenog skupa ograničenja. Ključne reči: Optimizacija, površinski kop uglja, ograničenja, profitabilnost Abstract The process of open pit mine optimization, as an integral part of strategic planning, is very important from the point of view of achieving maximum economic ...
... profitability. For this reason, it is very important to apply modern optimization tools, which can significantly facilitate the entire optimization process, and also reduce business uncertainty. ! Stevanović Dejan, Univerzitet u Beogradu, Rudarsko-geološki fakultet, Beograd ? Banković Mirjana, U ...
... Beogradu, Rudarsko-geološki fakultet, Beograd 4 Marković Petar, Beograd 5 Ranković Dejan, Beograd 76 This paper presents issues related to the process of optimization of open pit coal mines using modern optimization algorithms, as well as the possibility of finding optimal solutions within a set ...Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Petar Marković, Dejan Ranković. "Ograničenja primene optimizacionih algoritama u slučaju kopova" in XIV Međunarodna konferencija OMC 2020, Zlatibor, Srbija, 14-17. oktobar 2020., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2020)
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A survey of greenhouse gases production in central European lignites
Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)... Molecular Sieve 5A 30 m × 0.53 mm ID columns connected together. Injector temperature was set to 120 °C and oven temperature was set to 40 °C. Helium was used as the carrier gas. Methane and carbon dioxide production rate was determined based on the linear increase in the concentration of a given gas ...
... contain pyrite.When py- rite is exposed to air, in the presence of humidity, it is oxidized, forming sulphuric acid (Dos Santos et al., 2016). This process contributes to the acidification of the environment and may increase the pore solute con- centration. This is because, unlike pyrite, sulphuric acid ...
... utilizing only a narrow range of substrates such as H2/CO2, formate, acetate, methanol, and methylated compounds. Methanogenesis is in fact a multistage process in which exact CH4 formation by methanogenic Archaea is preceded by the degradation of complex organic molecules by a consortium of vari- ous micr ...Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska. "A survey of greenhouse gases production in central European lignites" in Science of The Total Environment, Elsevier (2021). https://doi.org/10.1016/j.scitotenv.2021.149551
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Integrative GHG Assessment in Oil and Gas Industry
Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...... This process lcads to significant emissions of CH+, and CO». Aside rom intentional flaring at the production site, the flaring process can take place during hydrocarbon processing as non-routinc e3 energija, ekonomija, ekologija, 2023, god. XXV, br. 1 flaring. The gas flaring process is cha ...
... approach, while requested input data are of the Ileast extent and complexity. Input data for inventorying emissions from the stationary combustion process are: • Fuelconsumption, i.c., data on the amount of hcat energy produced in combustion processes, • Default emission factor for cach gas and ...
... characterized as vcry often being a non-complete combustion process. This leads to a portion of Methane bcing directly emitted into the atmosphere and in this way cnlarges the overall greenhouse cffect. One of the widely used methodologies for determining emissions from flaring is presented by API ...Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa. "Integrative GHG Assessment in Oil and Gas Industry" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.51M
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Application of Membrane Technology for Separation CO2 from Natural Gas
Natural gas consists of a mixture of hydrocarbons with the largest share of methane, and non-hydrocarbon impure components such as N2, CO2 and H2S. In order to fulfill the gas market requirements, it is necessary to separate these unwanted components from the natural gas stream. There are several available technologies for the separation of CO2 from natural gas, such as: polymeric membranes, cryogenic distillation, absorption and adsorption. In this paper is presented the mechanism of CO2 separation using membrane technology, ...Lola Tomić, Dušan Danilović, Vesna Karović Maričić, Branko Leković, Miroslav Crnogorac. "Application of Membrane Technology for Separation CO2 from Natural Gas" in Underground Mining Engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2020)
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Analiza pouzdanosti dozera angažovanih na površinskim kopovima RB Kolubara
U radu je izvršena uporedna analiza pouzdanosti transportnih sistema dozera koji rade na površinskim kopovima Rudarskog basena Kolubara. Period za koji je vršena analiza je prvih deset godina eksploatacije. Efikasnost tehnološkog procesa na otkopavanju korisne mineralne sirovine i otkrivke u velikoj meri zavisi od rada dozera. Iskorišćene su matematičke metode za aproksimaciju i identifikaciju zabeleženih vremena u radu, kako bi se dobili analitički pokazatelji pouzdanosti. Na ovaj način se bitno podiže kvalitet upravljanja procesom eksploatacije i održavanja mašina na ...... transport systems which working on the open pit mines of the Kolubara Mining Basin. Analysis period is first ten years of exploitation. Efficiency of process on excavation of mineral raw material and overburden largely depends of dozers work. The paper uses mathematical methods for approximation and ide ...
... on of working times in order to obtain analytical reliability indicators. In this way, the quality management of the exploatation and maintenance process is significantly raised. Keywords: dozers, reliability, kolubara mining basin 1. Uvod Rudarska industrija predstavlja važnu privrednu granu. Poslednjih ...Filip Miletić, Dragan Milčić, Miloš Tanasijević, Miloš Milovančević. "Analiza pouzdanosti dozera angažovanih na površinskim kopovima RB Kolubara" in 10th International Conference Coal 2021, Jugoslovenski komitet za površinsku eksploataciju, Zlatibor (2021)