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Упит dcterms_subject_txt:energy related emissions

554 items

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic
    ... industry, introductory presentation, in: Proceedings of 12th Symposium with International Participation Risk Management, Prevention and Security in the Energy Sector, Belgrade, Serbia, 2004, pp. 5–11. [2] B.S. Dhillon, O.C. Anude, ?ining equipment reliability: A review, Microelectron. Reliab. 32 (8) (1992) ...
    ... the research. The most severe consequence of a failure, beside machinery breakdown, is a workplace injury with a death out- come [1]. Most of the related research is focused on the reliability of the machine elements. Dhillon and Anude [2] provide a de- tailed overview of the research on mining machinery ...
    ... undertaken. The fact that the application of fuzzy logic theory provides the results that indicate a risk trend and unambiguously point to future events related to system failure is very important. 3.1. Failure severity assessment The failure severity assessment of engineering system ele- ments based on the ...

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer
    ... relating to inclination (flat terrain – for all machines = 1) kg – coefficient relating to losses along the sides of scraper during pushing-transport (related to length of excavation and pushing of material) ηt –time utilization coefficient (same for all machines = 0.8) Tsm – shift time (same for all machines ...
    ... machines = 1.3) Tc – cycle time, in this case, includes only excavation and pushing processes: tk – excavation time and formation of pushing prism (related to length of excavation and pushing of material, the same value for all machines and in function to speed of bulldozer (first gear), which is different ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes
    ... mineral composition of selected samples was investigated using a JEOL JSM-6610LV scanning electron microscope (30 kV accelerating voltage) with an energy-dispersive X-ray spectrometer (SEM/EDS; X- Max Large Area Analytical Silicon Drift connected with INCAEnergy 350 Microanalysis System). After the maceral ...
    ... applied during 5 min to the mixture in order to produce stabile pellets. Semi quantitative and qualitative analysis was performed with the Spectro Xepos Energy Dispersive XRF (EDXRF) in- strument with a binary cobalt/palladium alloy thick-target anode X-ray tube (50 W/60 kV) and combined polarized/direct ...
    ... environment. n-Alkanes pattern in sample V2 points to the transition to wetland environments. This is in agreement with recent geological findings related to the ar- chaeological site Vinča, which has shown that the sediments below the archaeological settlement have been formed in a marsh-lake environ- ...

  • Анализа стања квалитета ваздуха у граду Суботици за период од 2020. до 2023. године

    Филип Величковић (2024)
    Овај завршни рад истражује концентрацију честица PM2.5 (честица са пречником мањим од 2,5 микрометра) и PM10 (честица са пречником мањимод 10 микрометара) у Суботици, и говори какав негативан утицај имају на здравље становништва.Пре тога је објашњена општа прича о аерозагађењу и саставу ваздуха, укључујући опис свих критеријумским загађивача, законској регулативи што се тиче квалитета ваздуха и дате су неке основне информације о агломерацији Суботица. Коришћени су подаци о концентрацији РМ2.5 и РМ10 честица прикупљени током истраживања ваздушног квалитета у ...
    ваздух, честице, PM2.5 , PM10, здравље
    ... saeM:bHmrra.[6] Ha cnaunp(Crka 6)nmpHKa3aHH Cy HEKH OJL HauHHa KaKO Jby)H H HpHpojia aaraljyJy Ba3/lyX. 12 REACTIONS TOSUNMLIGHT „ | / EMISSIONS CONCENTRATIONS MAN-MADE AND MPACTS ON PEOPLE NATURAL SOURCES AND ENVIRONMENT Cnuka 6 — J3azabetnbe 6a30yxa IIocroju BHmre nonena 3araljaBaua ...

  • E-Connecting Balkan Languages

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Svetla Koeva (2009)
    In this paper we present a versatile language processing tool that can be successfully used for many Balkan languages. This tool relies for its work on several sophisticated textual and lexical resources that were developed for most of Balkan languages. These resources are based on several de facto standards in natural language processing.
    Query expansion, e-dictionary, wordnet, proper name, aligned text

  • A Lexical Approach to Acronyms and their Definitions

    Cvetana Krstev, Duško Vitas, Ranka Stanković (2015)
    In this paper we present a comprehensive approach to acronyms for Natural-Language Processing (NLP) of Serbian texts. The proposed procedure includes extraction of acronyms and their definitions that are usual Multi-Word Units (MWUs), shallow parsing of MWUs that enables MWU lemmatization and production of entries in morphological electronic dictionaries, both for MWU and acronyms, that are provided with grammatical, syntactic, semantic and domain information. This approach enables representation that reflects complex relations between acronyms and their definitions.

  • On the compatibility of lexical resources for NooJ

    Ranka Stanković, Miloš Utvić, Duško Vitas, Cvetana Krstev, Ivan Obradović (2012)
    Lexical resources for many languages are provided for the NooJ linguistic development environment. Meta-data descriptions of morphosyntactic and semantic properties of these languages and their resources are a mandatory part of each language module. In this paper we analyze how well the meta-data actually describe resources for a chosen subset of languages and to what extent are they compatible across languages to support multilingual processing. We show that there is place for improvement in both directions.

  • 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)
    rekultivacija, ugalj, održivi razvoj, višekriterijumsko odlučivanje, VIKOR

  • 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

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN
    ... recovery of chalcopyrite decreases. The appearance of pronounced natural flotability of chalcopyrite at the pulp pH of 6.20 and 8.20 is directly related to the oxidation state of the mineral surface, which is in accordance with the results of other researchers [14 – 20]. In the second series of ...

  • Advantages and Disadvantages of a Parallel and Zigzag Method of Acquisition in Walking Mode in Magnetometric Archeological Research

    Mirko Petković, Vesna Cvetkov, Branislav Sretenović (2014)
    магнетометријска испитивања, цик-цак и паралелна аквизиција у ходајућем моду, линеарне аномалије, археологија

  • 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

  • Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta

    Vesna Cvetkov (2020)

  • 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

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi

  • Application of auto-cross-regression models from the shortterm forecast of karst spring discharges

    Vesna Ristić Vakanjac, Veljko Marinković, Ljiljana Vasić, Saša Milanović, Branislav Petrović, Petar Vojnović (2024)
    Човек je одвајкада је покушавао да пронађе начина да предвиди одређене појаве у природи. Како су људске насеобине углавном биле везане за обале река, предикција поплаве је била од великог значаја за њен опстанак. Касније, развојем цивилизације, а нарочито са индустријском и технолошком револуцијом, отпочиње се са развојем одређених модела којима се на основу улазних компоненти срачунава излазна величина која је од интереса, а у овом случају је то протицај или водостај реке или извора (врела). Најједноставнији модели су ...
    режим, карстно врело, истицање, аутокросрегресиони модел

  • Primena digitalne fotogrametrije u rudniku Rudnik

    Nikola Mirković, Luka Crnogorac, Katarina Urošević (2023)
    Digitalna fotogrametrija, lasersko skeniranje i virtuelizacija sve više pronalaze aktivne uloge u rudarstvu, prvenstveno zbog svoje široke mogućnosti primene. Laserskim skeniranjem i fotogrametrijom snimaju se i kreiraju 3D modeli otkopa, jamskih hodnika, površinskih kopova, površinskih objekata (zgrada, spomenika, predmeta), a vrši se skeniranje celih rudnika koji se rekonstruišu u 3D digitalne modele. Fotogrametrija predstavlja proces fotografisanja objekata pomoću fotoaparata i daljom obradom fotografija u različitim softverskim alatima kreiraju se realne kopije 3D modela objekata ili predmeta u digitalnoj formi. Za ...
    digitalna fotogrametrija, prostorna vizuelizacija, rudarski objekti, podzemna eksploatacija
    ... Mining, metallurgy & exploration, 36, 597-606 [19] Tichon, J., & Burgess-Limerick, R. (2011). A review of virtual reality as a medium for safety related training in mining. Journal of Health & Safety Research & Practice, 3(1), 33-40 [20] Cruz-Neira, C., Sandin, D. J., & DeFanti, T. A. (2023). Sur ...

  • Rule-based Automatic Multi-word Term Extraction and Lemmatization

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Biljana Lazić, Aleksandra Trtovac (2016)
    In this paper we present a rule-based method for multi-word term extraction that relies on extensive lexical resources in the form of electronic dictionaries and finite-state transducers for modelling various syntactic structures of multi-word terms. The same technology is used for lemmatization of extracted multi-word terms, which is unavoidable for highly inflected languages in order to pass extracted data to evaluators and subsequently to terminological e-dictionaries and databases. The approach is illustrated on a corpus of Serbian texts from ...
    term extraction, terminology, multi-word units, lemmatization, finite-state transducers

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods
    ... Keywords: bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods. 1. INTRODUCTION A stable and independent energy supply is the main task for every country. This is achieved with sufficient production of electric power for the country's needs. In the Republic ...
    ... of electric power is obtained by burning coal in thermal power plants. It is important to accomplish a timely supply of thermal power plants with energy sources, in this case, lignite. The annual production of lignite from open-pit mines is about 37-42 million tons. Production of lignite is obtained ...
    ... AHP method is used for the sustainable chain of electricity supply, for 7 European countries whose participation of 86.8% of the total photovoltaic energy sector [13]. 2. METHODS AND MATERIALS Multi-Criteria Decision Methods (MCDM) are used for evaluation or selection among multiple alternatives ...