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Упит dcterms_subject_txt:equipment selection

239 items

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri
    ... ty. The obtained result does not provide the availability structure. Delays caused by completing paperwork, waiting for manpower, tools, test equipment or waiting for spares have an influence on machine availability but mostly they are not noted. Therefore, for providing relevant information about ...
    ... A., Khan S., Eiroa A.L., Butler N., Rushton K, Brocklebank S., Perspectives on trading cost and availability for corrective maintenance at the equipment type level, Reliability Engineering & System Safety, 168, Pages 53-69, 2017. [4] NATO ARMP-4, Guidance for writing NATO r & m requirements documents ...
    ... Fuzzy composition Probab.theory, Stat.processing Best-fit method Linguistic value Decision model, Asset managment, Optimization, Ranking and Selection Verification AVAILABILITY EVALUATION 2 3 4 5 µ (A) 1.00 0 0.50 poor adequate goodaverage excellent 0.75 0.25 1 ј Figure 3. Structure ...

  • Application of the VIKOR Method for Selecting the Purpose of Recultivated Terrain after the End of Coal Mining

    Radmila Gaćina, Sanja Bajić, Bojan Dimitrijević, Tomislav Šubaranović, Čedomir Beljić, Dragoljub Bajić (2024)
    reclamation, coal, sustainable development, multi-criteria decision making, VIKOR method

  • 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 ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... Maintainability and Reliability; The Research Center of Dependability and Quality Management DQM: Prijevor, Serbia, 2007. 2. Dhillon, B.S. Mining Equipment Reliability, Maintainability and Safety; Springer: London, UK, 2008. 3. Todorovic, J. Maintainability Engineering; JUMV: Belgrade, Serbia, 1993. ...
    ... sets theory. Expert Syst. Appl. 2012, 39, 8940–8946. [CrossRef] 11. Ebramhimipour, V.; Suzuki, K. A synergetic approach for assessing and improving equipment performance in offshore industry based on dependability. Reliab. Eng. Syst. Saf. 2006, 91, 10–19. [CrossRef] 12. Ivezic, D.; Tanasijevic, M.; Ignjatovic ...
    ... 29, 317–326. [CrossRef] 14. Tanasijevic, M.; Ivezic, D.; Jovancic, P.; Ignjatovic, D.; Bugaric, U. Dependability assessment of open-pit mines equipment—Study on the bases of fuzzy algebra rules. Eksploat. Niezawodn. Maint. Reliab. 2013, 15, 66–74. 15. Jones, J.V. Supportability Engineering Handbook; ...

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... implies a controlled, quiet and incomplete onsite combustion, without any personnel involved, and equipment placed underground. Also, there is no need for investments in expensive process equipment, as well as conveyer or tube transportation systems for slag and ash to landfills. Considering these ...
    ... E (13) The cost of gasification depends on the price of production of the 12 planned bore- holes, as well as other significant investments in equipment and installation of the necessary plant gear on the given exploitation field. The timeline to work on the gas production, when performing a t ...
    ... Stand-alone or grid-connected photovoltaic systems could be in- stalled to deliver onsite power for running dedicated pumps, and other UCG process equipment creating complete UCG energy generation furthermore environmentally friendly. Preliminary studies are showing that the planned photovoltaic system ...

  • SrpELTeC: A Serbian Literary Corpus for Distant Reading

    Ranka Stanković, Cvetana Krstev, Duško Vitas (2024)
    U članku je predstavljen SrpELTeC, korpus razvijen u okviru akcije COST Distant Reading for European Literary History (CA16204). Svi romani u SrpELTeC-u su odabrani, pripremljeni i obeleženi korišćenjem zajedničkih principa uspostavljenih za sve jezičke zbirke u Evropskoj zbirci književnog teksta (ELTeC). Navedeni su izazovi i rešenja u pripremi SrpELTeC od nule. Svi romani su ručno kodirani u TEI sa bogatim metapodacima i strukturnim napomenama. Automatska anotacija je uključivala POS-označavanje, lematizaciju i imenovane entitete, oslanjajući se na resurse za obradu ...
    digital humanities, Serbian literature, text corpora, distant reading , linked data, named entity recognition, text analytics

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    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 ...
    mine planning, variability of coal quality, simulation, coal blending

  • A Multilingual Evaluation Dataset for Monolingual Word Sense Alignment

    Sina Ahmadi, John P McCrae, Sanni Nimb, Fahad Khan, Monica Monachini, Bolette S Pedersen, Thierry Declerck, Tanja Wissik, Andrea Bellandi, Irene Pisani, [...] Ranka Stanković and others (2020)
    Aligning senses across resources and languages is a challenging task with beneficial applications in the field of natural language processing and electronic lexicography. In this paper, we describe our efforts in manually aligning monolingual dictionaries. The alignment is carried out at sense-level for various resources in 15 languages. Moreover, senses are annotated with possible semantic relationships such as broadness, narrowness, relatedness, and equivalence. In comparison to previous datasets for this task, this dataset covers a wide range of languages ...
    lexical semantic resources, sense alignment, lexicography, language resource
    ... effective and we believe will simplify the de- velopment of machine-learning-based classifiers for sense alignment prediction. 3.2. Data selection The selection of the initial set of lemmas and senses to be aligned is guided by the following criteria: • The lemmas should represent all open class ...
    ... Danske Ordbog (DDO) (Farø et al., 2003) a dic- tionary of modern Danish covering Danish from 1950 till today. One additional criterion in data selection was that at least one of the senses in DDO should be linked to a base or core concept in the Princeton Word- Net via the Danish WordNet (Pedersen ...

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... sources: using n-grams that appear in Wikipedia article titles as candidates for keywords [22], utilizing Wikipedia as a thesaurus for candidate selection from documents’ content [21], exploiting links on Wikipedia to detect keywords candidates [24] or using termi- nological databases to encode the salience ...
    ... domain scientists and this can be highly subjective, com- prising of a lot of background knowledge on the topic. Sometimes their approach to keywords selection is oriented on the overall meaning and essence. Thereafter, in several cases the given keywords are not present in the text as the same term, in those ...

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... ing energy se- curity and determination of energy indicators [1-6]. Selection of data used for indicators deter- mination primarily depends on the vision of a multi-dimensional concept of energy security, and from the selection of critical dimensions for functioning of the energy system and its safety ...

  • 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
    ... energy dissipation with respect to the surrounding environment. The following equations present the exergy loss in different equipment. The exergy loss in each piece of equipment includes the exergy difference between the inlet and outlet. Here, the power consumed in a pump is added to the calculation ...
    ... A challenge with the desalination process is the waste of brine solids in huge quantities with high salt concentration leading to corrosion of equipment [17]. Desalination is unlikely to penetrate the market without any significant cost advantages. According to a recent DOE report published in ...
    ... cycle [81]. Computer models have been developed in the oil and gas industry to predict the movement and trapping of hydrocarbons and wells and equipment that have been used over the period reduces cost. Storage in reservoirs at depths less than approximately 800m may be technically and economically ...

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... shifting toward environmentally acceptable, resource- independent cities (Lu et al. 2020). Selection of an appropriate heat pump is strongly driven by characteristics of available heat source. Besides selection of the appropriate heat pump technology, the heat source has influence on the placement ...
    ... the technical potential of wastewater heat for cities without WWTP. This information can be valuable in the preparation phase and WWTP loca- tion selection. In this paper, the proposed methodology was applied for Serbia as a case study, assuming a scenario of integration of heat pumps in the existing ...

  • Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika

    Saša M. Jovanović (2016-05-16)
    Investiciono okruženje skopčano sa rudarskom industrijom je veoma svojstveno kada seuporedi sa okruženjima koje susrećemo u tipičnim proizvodnim industrijama. Neke odkarakterisitka rudarstva, koje su često naznačene kao jedinstvene su: visok intenzitetinvesticija, dugi predproizvodni periodi, visok rizik i neobnovljivost resursa.Investiranje u sistem otvaranja rudnika predstavlja dobar primer ireverzibilneinvesticije. Takva investicija zahteva pažljivu analizu, jer nakon njene realizacije ona sene može nadoknaditi bez značajnog gubitka vrednosti. Očigledno je da izbor sistemaotvaranja podzemnog rudnika pripada strateškom planiranju...
    otkopavanje; otvaranje; mreže i grafovi; fuzzy skupovi; stohastičkiprocesi; indeks konveksnosti; sistemi podrške odlučivanju
    ... underground development system selection. Saša M. Jovanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika;Fuzzy stochastic model of underground development system selection. | Saša M. Jovanović | ...
    ... that , the number of potential alternatives is increased. Generally speaking, the process of selection of an underground mine development system encompasses the identification, evaluation and selection among alternatives. To solve the problem of selecting a suitable development system, we consider ...
    ... FACULTY OF MINING AND GEOLOGY Saša M. Jovanović FUZZY STOCHASTIC MODEL OF UNDERGROUND MINE DEVELOPMENT SYSTEM SELECTION Doctoral Dissertation Belgrade, 2016. Mentor: dr Zoran Gligorić, redovni profesor Univerzitet u Beogradu ...

  • Optimizacija utovarno-transportnih sistema u funkciji planiranja površinskog kopa

    Mirjana V. Banković (2018-07-13)
    Profitabilna eksploatacija sve složenijih ležišta je težak zadatak koji zavisi odtemeljnog procesa analize, planiranja i projektovanja rudnika. Izvodljiv strateškiplan mora da zadovoljava društvena, regulatorna, tehnološka, geometrijska iekonomska ograničenja. Kako bi se postigao osnovni cilj, odnosno profitabilnost iodrživost rudarskog projekta na duži period, neophodno je unapređenjematematičkih modela i informatičke podrške procesima planiranja i optimizacijekoji će omogućiti efikasnu realizaciju ovih ciljeva...
    tehnološki model, integralni model, planiranje, optimizacija,utovarno-transportni sistem, neto sadašnja vrednost projekta
    ... decision support system for optimal equipment selection in open pit mining: analytical hierarchy process. Istanbul University, Mining Engineering Department, 16 (2), 1-11. 193 Basçetin, A., 2004, An application of the analytic hierarchy process in equipment selection at Orhaneli open pit coal mine ...
    ... bench. CIM bulletin, 88, 50-52. 200 Lizotte, Y., 1988, Economic and technical relations between open-pit design and equipment selection. Mine Planning and Equipment Selection. Singhal (Ed). Balkema, Rotterdam, 3-12. Marques, D. M., Costa, J. F. C., 2013, An algorithm to simulate ore grade variability ...
    ... 2003, Sizing equipment for open pit mining–a review of critical parameters. Mining Technology, 112 (3), 171-179. Buhl, B., 2002, The surface mine planning and design course. MMPE410. University of British Columbia, Industrial Presentations. Burt, C., Caccetta, L., 2013, Equipment Selection for Surface ...

  • 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
    ... more than twice as much available dozers in relation to operating ones. It should be noted that dozers are generating 45 — 50% of all auxiliary equipment costs. This implies the necessity for detailed analysis ог all parameters of these machines, including. current and historic trends, as well as ...
    ... of mining machines (in Serbian), University of Belgrade — Faculty of Mining and Geology, Belgrade, 2014. 3. Gransberg, D.D.; O’Connor, E.P. Major Equipment Life-cycle Cost Analysis, Principal Investigator Institute for Transportation lowa State University, 2016. 4. Nurock, D.; Porteous, C. Methodology ...
    ... important that open-cast mine has sufficient number of available dozers [1, 4, 6]. Therefore, benefits emerging from this attitude on auxiliary machines selection, including savings and improvements, can be achieved by these activities: In-time replacement of auxiliary machines and vehicles; Usage of proven ...

  • Energetska efikasnost elektromotora na površinskim kopovima

    Snežana Aleksandrović, Ilija Jeftenić (2023)

  • Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...
    Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatori

  • Contribution to the geotechnical classification of municipal waste landfills in Serbia

    Dragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić (2018)
    Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental Engineering

  • Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova

    Zoran M. Štirbanović (2015-07-01)
    Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...
    rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina
    ... Vol. 56, No. 3, 2006, pp. 165–183. 84. J. A. Caldwell, A. MacG Robertson, Selection of tailings impoundment sites, Die sivilie ingenieur in Suid Afrika, 1983, pp. 537-552. 85. A. MacG Robertson, A. S. Moss, Site selection and optimization studies for mill sites and tailings impoundments, Asian ...
    ... choosing flotation machine. The parameters that have the most influence during these three choices were determined, and they represented criteria for selection. The selected criteria were assigned with appropriate value, and subsequently the evaluation of the proposed subjects was carried out. In this way ...
    ... Support Systems 37, 2004, pp. 583– 597. 20. J. Wanga, A.-R. Hedar, S. Wang, J. Mac, Rough set and scatter search metaheuristic based feature selection for credit scoring, Expert Systems with Applications 39, 2012, pp. 6123–6128. 21. J.-W. Liu, C.-H. Cheng, Y.-H. Chen, T.-L. Chen, OWA rough set ...