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Упит dcterms_subject_txt:maintenance operations

149 items

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Hydraulic impact of pressure transients from water conveyance tunnel on the complex hydrogeological system: A case study HPP

    Igor Jemcov, Maja Todorović, Aleksandar Jemcov, Marina Ćuk Đurović (2024)
    Tunel pod pritiskom, Unutrašnji pijezometri, Tranzijenti pritiska, Karstna izdan, Pukotinska izdan, Hidraulički odziv
    ... pressure transient analysis as a tool for hydrogeological characterization. • Anefficient method for monitoring the environmental impact of HPP operations. Abstract Hydraulic tunnels, integral components of hydropower plant (HPP) systems, traversing diverse rock masses, pose challenges for long-term ...
    ... that showed reactivity, notably those close to the surge tank, displayed immediate and significant pressure changes in response to the turbine operations. On the other hand, piezometers situated further away exhibited attenuated responses, indicating the presence of different hydraulic conductivity ...

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... June 27, 2023 Abstract Technoeconomic, environmental and safety criteria generally affect the management of metallic and non-metallic mining: operations. The first basic question that needs to be addressed when planning, ore mining is which methods are adequate and what is the optimal mining; ...
    ... geneous rocks, with numerous fractures and a number of fault zones. Expert experience suggested potential problems for certain types of mining. operations. Additionally, also based on experience and the physical and mechanical proper- 1414 M. Čelebić, S. Bajić, D. Bajić et al. ties of bauxite ...
    ... deposit zone, where tectonic transport was most distinct, and found to be rather unfavourable. The most adverse area for underground mining: operations is the zone of contact between the overlying: and underlying, limestones, and especially within the ore deposit and its immediate environment. ...

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... steps must be followed (the approval of the recultivation plan and post-mining plan to the proposed changes). After the completion of mining operations, enterprises must complete reclamation of the land within the specified period and government departments should organize timely acceptance after ...
    ... Techniques Reference Document for Management of Waste from Extractive Industries offers more than 700 pages of examples for good practice mining operations and best available techniques. Moreover, the Reference Document on BAT is not legally binding and the recommendation requires further specification ...
    ... example, in Germany there is one single legislative regime or framework - the national mining law, BBergG (1980) - bringing together all mining operations and the general environmental laws to speed up and simplify the complex planning process. The law in Serbia defines that the Exploitation Holder ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... of threats to the environment 1 16–21 20 Identifying causes of the adverse effects caused by operations 1 6–11 21 Identifying opportunities for eliminating causes of the adverse effects caused by operations 2 11–17 Energies 2016, 9, 1071 11 of 20 Table 5. Cont. No. Project Management Activities ...
    ... development principles include indicators of response; indicators of causes represent the environmental consequences of mining and energy complex operations; and indicators of conditions are related to environmental quality [7]. The principle of sustainable development affirmed by the Bergen Declaration ...
    ... 1 2–3 3 Defining key problems in the functioning of mining and energy complex protection systems 1 3–4 4 Defining the impact of energy complex operations on environmental quality 1 2–5 5 Analyzing the possibility of applying the basic principles of sustainable development in the energy sector 2 4–5 ...

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... CcAPEx=Cfacilities (15) The main costs contributing: to the OPEX are those of energy consumption and maintenance. The cost of energy consumption occurs during the pressurization process, and the maintenance cost is assumed to be 1% of the CAPEX. COPEX=CEnergy consumpti0n+0·01CCAPEX (16) Since the CO> ...
    ... Žni=1ni(exi,in—exu,om) (13) Life cycle cost analysis (LCC) is an economic method for estimating all costs arising from the ownership, operation, and maintenance of equipment. These costs are organized as capital expenditures (CAPEX) and operational expenditures (OPEX). CAPEX is incurred when a business ...
    ... are calculated as gross sales price on the shore terminal minus transport fee in the pipeline to shore. The cost of operational personnel and maintenance are very marginal. The cost of OPEX is estimated at 7million USD every year. 6.2. Examples of CCUS projects under development 6.2.1 Northern ...

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... analysis of oil well operations in Gas Lift, which should result in more efficient oil production on the one hand and the increase in oil production on the other hand. It has also proposed a new modern desalination method, which considerably decreases production and operations costs, as well as ...
    ... stanice 8, 9, i 10. Proizvodnja nafte se vrši uglavnom pomoću gaslifta. Naftno polje Amal je u vlasništvu kompanije „Harouge Oil Operations“ (prethodno „Veba Oil Operations“), koja predstavlja zajedničko ulaganje Nacionalne naftne kompanije Libije i kanadske kompanije „Petro-Canada“ sa učešćem od po ...
    ... presented at the 1995 SPE International Symposium on Oilfield Chemistry, Texas, and February 14-17. Harouge (2011), About Harouge Oil Operations, Harouge Oil Operations, www.vebalibya.com. Harvie C. (2013) Oil and economic development: Libya in the post-Gaddafi era, Economic Modelling, Volume 32 ...

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... analysis of oil well operations in Gas Lift, which should result in more efficient oil production on the one hand and the increase in oil production on the other hand. It has also proposed a new modern desalination method, which considerably decreases production and operations costs, as well as ...
    ... stanice 8, 9, i 10. Proizvodnja nafte se vrši uglavnom pomoću gaslifta. Naftno polje Amal je u vlasništvu kompanije „Harouge Oil Operations“ (prethodno „Veba Oil Operations“), koja predstavlja zajedničko ulaganje Nacionalne naftne kompanije Libije i kanadske kompanije „Petro-Canada“ sa učešćem od po ...
    ... presented at the 1995 SPE International Symposium on Oilfield Chemistry, Texas, and February 14-17. Harouge (2011), About Harouge Oil Operations, Harouge Oil Operations, www.vebalibya.com. Harvie C. (2013) Oil and economic development: Libya in the post-Gaddafi era, Economic Modelling, Volume 32 ...

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... moment with minimal cost (Figure 3). [2] Equivalent Uniform Annual Cost (EUAC) 4 a Optimal Economic Life: Min EUAC , Total Cost i i Operations and Maintenance Cost Capital Cost vW Time of Use Figure 3. The economic life of the machine, based on the minimal cost method (1) Hourly ownership ...
    ... costs, which are including labor, auxiliary facilities, installations required for work; e Maintenance costs, which are including maintenance labor, spare parts, tools, devices and facilities for maintenance. where: T C,=C, +] fadt+C,7, 0 C, — total life cycle costs, C, — ownership costs, C; — ...
    ... In this period profit is the highest due to low maintenance costs. Subsequent period has larger operational costs, but machine still generates profit, while finally, there is a period during Wwhich machine still сап operate, but with large maintenance cost and declined reliability, meaning that we аге ...

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2023)
    ... of seismic shocks in the open pit Kovilovača were performed during blasting, conducted for the purpose of deposit exploitation [9]. Two blasting operations were performed. Balkanit 60/1500, detonex 65/1500 and ANFO 70/1500 were used as explosives. Activation of explosives in the borehole was performed ...
    ... Belgrade, Serbia, 1996; pp. 141—150. Trajković, S.; Tokalić, R.; Lutovac, S. Sfudy of Seismic Impacts on Adjacent Building due to Blasting Operations at Kovilovača Open Pit, Faculty of Mining and Geology, Belgrade, Serbia, 2004; pp. 2-43. 204 ...

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... dominantly manual with automated individual operations; semi-automatic; dominantly automatic with secondary manual controls; fully automated}. Parameter A3 represents maintenance (maintainability). It contains supportability and design predispositions for maintenance. Grades are given depending on the g ...
    ... dominantly manual with automated individual operations; semi-automatic; dominantly automatic with secondary manual controls; fully automated}. Parameter A3 represents maintenance (maintainability). It contains supportability and design predispositions for maintenance. Grades are given depending on the g ...
    ... problems in the well. A3 = {spare parts, tools, and people fully dislocated, maintenance on demand; corrective maintenance present; corrective and service maintenance; planned preventive maintenance; proactive maintenance}. Parameter B1 considers depth. The values of the depth of the well are translated ...

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... Lutovac Suzana1, Bajić Sanja1, Gaćina Radmila1, Ravilić Marina1 Received: May 29, 2015 Accepted: June 15, 2015 Abstract: During blasting operations, the potential energy of explosive materials is transformed into a mechanical work. That energy, in the vicinity of blasting location, destructs ...
    ... "Nepričava" surface mine were performed during blasting, conducted for the purpose of deposit exploitation (Trajković & Lutovac, 2006). Three blasting operations were performed. Balkanit 60/1000 and Videksil 65/2000 are used as explosive materials. The activation of explosives in boreholes was performed ...

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • Development of Open Educational Resources (OER) for Natural Language Processing

    Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević (2015)
    In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...
    E-Learning, Open Educational Resources, Computational Linguistics, Lexical Resources, edX
    ... Portuguese, Russian, Thai, Korean, Italian, Spanish, Serbian, Norwegian, Arabic, German, Polish and many more. For text processing simple string operations can be used, but underlying e- dictionaries enable much more sophisticated approaches. Besides simple regular expressions, graphs that represent ...
    ... as the use of information from e-dictionaries for output transformations by transducers. More types of variables are introduced as well as operations on them. 11. Organization of graphs in cascades enables complex text transformation. Each graph in a cascade is a transducer that transforms ...

  • Метода променљивих околина за решавање проблема p-центра са поузданом мрежом

    Јована Рађеновић, Стефан Мишковић, Оливера Станчић (2023)
    У овом раду је разматран проблем p-центра са поузданом мрежом (енгл. Reliable p-center facility location problem - RpCFLP). Решавање проблема подразумева иницијално успостављање p ресурса и алокације корисника, као и накнадну реалокацију корисника у складу са новонасталим сценаријима који садрже информације о онеспособљеним ресурсима и осталим измењеним улазним подацима. За решавање посматраног проблема предложена је метахеуристика заснована на итеративној варијанти основне методе променљивих околина (енгл. Iterated basic variable neighborhood search - IBVNS). Резултати тестирања предложене метахеуристике указују на њену ...
    Проблем p-центра, Робусна оптимизација, Метода променљивих околина

  • Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit

    Suzana Lutovac, Nebojša Vidanović, Čedomir Beljić, Zoran Gligorić (2015)
    ... quently used in case of equidistant values for variable R. Here it is necessary that h is a small number, which is not the case with blasting operations in mining engineering. Previous studies have shown that the value of the parameter n moves principally in the interval from 1 to 3, most often ...
    ... (11) In practice it may be taken that R1 is the smallest reduced distance, while Rs is the greatest reduced distance observed during blasting operations, i.e measurements. In the formula (8), the values v(Rs), v(R1), Rs and R1 we take from the table of experimental data, so that we have: c ...
    ... the model for solving the rock mass oscillation law is determined, taking: n RKv which is valid for given environment, where blasting operations were performed. 3 DEFINING THE STATISTICAL CRITERIA To evaluate the degree of correlation between recorded (measured) and calcu- lated data ...

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... rods. 3. Predictive maintenance 20 Machine learning algorithms can use real-time data to predict potential failures before they occur. For instance, if certain patterns in the data are identified as precursors to a failure, the system can alert the need for maintenance before a serious issue ...
    ... and provide useful information for decision-making. 5. Monitoring and Maintenance: Continuously monitor model performance and make updates as needed. This includes retraining: models with new data and adjusting maintenance strategies based on results. 68 7.5. Recommendations for further research ...
    ... accuracy and efficiency of diagnostics. 1 Machine learning algorithms can analyze data collected from sensors, predict failures, and enhance maintenance strategies, leading to reduced downtime and optimized operational costs.In the third part, we will focus on sensors for detecting the operation ...