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Упит dcterms_subject_txt:General Engineering

593 items

  • Ograničenja primene optimizacionih algoritama u slučaju kopova

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Petar Marković, Dejan Ranković (2020)
    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 ...
    ... reliable coal quality delivery considering geological variability: A case study in polish lignite mining. Journal of Quality and Reliability Engineering, 2015 Stevanović D., Banković M., Pešić Georgladis M., Stanković R.: Approach to operational mine planning: Case study Tamnava West, Tehnika ...

  • The state and perspective of the natural gas sector in Serbia

    Dejan Ivezić, Marija Živković, Dušan Danilović, Aleksandar Madžarević, Miloš Tanasijević (2016)
    The strategy of long-term energy development of Serbia identifies an increase of share of natural gas in final energy consumption as one of the main aims. Serbia has signed a strategic agreement with the Russian Federation on cooperation in the oil and gas sector, within which the project South Stream pipeline is planned to be realized. In addition, the Republic of Serbia has signed the Treaty that establishes the Energy Community and accepted the obligation to implement the Energy ...
    Consumption, natural gas, scenarios of development

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

    Vesna Cvetkov (2020)
    ... magnetic data over settlement structures by inverse modelling. Archaeological Prospection 4, 4, Special Issue: Europen Geophysical Society XXII General Assemgly: 165- 177. Eppelbaum, L. V., Khesin, B. E, Itkis S. E. 2001. Prompt magnetic investiga- tions of archaeological remains in areas of inf ...
    ... Fields at Archa- eological Sites in Israel: An Introducti- on. Conference Proceedings, 23rd EEGS Symposium on the Application of Geop- hysics to Engineering and Environmental Problems, Apr 2010, cp-175-00124. Eppelbaum, L.V. 2015. Quantitative Interpretation of Magnetic Anomalies from Thick Bed, ...

  • Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation

    Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer (2021)
    kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje
    ... vectors dx (the deformed quadrilaterals) is determined by: dx = FdX. First row, incremental deformation, second row, cumulative deformation. 2.4 General deformation described with the deformation gradient Any deformation that can be described by F, can be written as a serial combination of a simple ...
    ... vectors dx (the deformed quadrilaterals) is determined by: dx = FdX. First row, incremental deformation, second row, cumulative deformation. 2.4 General deformation described with the deformation gradient Any deformation that can be described by F, can be written as a serial combination of a simple ...
    ... intensities in the 0.15–99.85 percentiles to the [0 1] intensity range, as the original colours span only a limited part of the intensity range. 5.3 General model evolution Initial deformation Fig. 12 depicts the principal stretches λmax, λmin and our inferred strain type after 7.5 min of model evolution ...

  • 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

  • Analiza primenjenih metoda za transport parafinske nafte

    Dunja Milojević (2024)
    Sadržaj parafina u nafti ima dominantan uticaj na svojstva parafinskih nafti. Taloženje parafina, odnosno taloženje čvrstih čestica parafinskog voska, predstavlja ozbiljan globalni problem tokom proizvodnje i transporta sirove nafte. Samo taloženje voska zavisi od termodinamičkih faktora, poput temperature, pritiska i sastava nafte. Transport nafte cevovodima je uobičajeni proces transporta u naftnoj industriji. Kada prilikom cevovodnog transporta parafinske sirove nafte, dođe do prekida protoka i hlađenja nafte ispod temperature stinjavanja, parafini će kristalisati, pri čemu će doći do, geliranja celokupne transportovane ...
    nafta, parafinski vosak, taloženje, transport, naftovod
    ... uklanjanja nataloženog parafina i racionalne potrošnje energije. 40 8. LITERATURA l. Abdel-Aal, H. (2021). Economic Analysis of Oil and Gas Engineering Operations. New York: CRC Press. 2. Alnaimat, F., Ziauddin, M., & Mathew, B. (2019, November 27). Wax Deposition in Crude Oil Transport Lines ...
    ... Guozhong, Z., & Gang, L. (2010). Study on the wax deposition of waxy crude in pipelines and its application. Journa! of Petroleum Science and Engineering. 12.iStock. (n.d.). Oil pipeline images. Preuzeto sa istock: https://www.istockphoto.com/search/2/image- film?phrase=oil%20pipeline&servi ...

  • Одређивање оптималне производње дубинске пумпе на клипним шипкама

    Небојша Савић (2024)
    Дужи временски период током историје производње нафте, дубинске пумпе на клипним шипкама су први и у многим случајевима једини избор када су у питању механичке методе експлоатације. Правилан одабир сваког појединачног елемента система омогућава оптимизацију која са собом повлачи бенефите у виду повећавања ефикасности и смањења трошкова. Тренутно примењени систем дубинских пумпи на клипним шипкама на лежишту „Н“ обезбеђује стабилну производњу и реализацију годишњих планова производње без већих проблема. У овом раду је приказан начин оптимизације производње дубинским пумпама ...
    дубинска пумпа, оптимизација, производња, потисни вентил
    ... IIHJby yHyTap Me yrpabyjy ryMeHHM MJMH rpa(OHTHH satTHBauH. Cnuka 4.3 Danmusna onasa (Takacs, G., 2015. Sucker-rod Pumping handbook: Production Engineering Fundamentals and Long-Stroke Rod Pumping, University of Miskolc, Hungary) 33 4.6. Kparka Be3a Ke3uHr-TyOHMHr KparKa ne3a Ke3MHr-ryOMHMr ...
    ... https://wessexcoastgeology.soton.ac.uk/Oil-South-of-England.htm (12.04.2024.) 7. Takacs, G., 2015. Sucker-rod Pumping handbook: Production Engineering Fundamentals and Long-Stroke Rođ Pumping, University of Miskolc, Hungary 8. PETROTEC/Downhole pump Five Basic Components of a Sucker Rod ...

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... Takacs, G., 2015. Sucker-rod Pumping handbook: Production Engineering Fundamentals and Long-Stroke Rod Pumping, University of Miskolc, Hungary [10] 4PI Technical report IIL fifth edition, Jun 2008. [11] Ahmet, T., 2000: Resevoir Engineering Handbook, Gulf Publishing, USA [12] Design Calculation ...
    ... through the space (clearance) between the plunger and the cylinder is determined based on experimental data and is expressed in various forms. The general equation for fluid loss through the clearance between the plunger and the cylinder is given by [15,19]: dAxAp*6B „ d4 H*L qs =K 3.1 • qs= fluid ...
    ... These elements include nickel, chromium, copper, molybdenum, and boron. Steel rods are classified by the American Petroleum Institute (API). The general description of each category is as follows [4]: API Class C: Made from carbon-manganese steel, designed to withstand light to medium loads in ...

  • Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike

    Milanka N. Negovanović (2015-06-30)
    Modeliranje predviđanja potresa tla od miniranja primenom fazi logike i metode MonteKarlo zasnovano je na podacima dobijenim terenskim merenjima potresa uzrokovanihminiranjem. Promenljive modela definisane su analizom parametara bušenja i miniranjaminskih serija, kao i velosigrama izmerenih potresa od miniranja. Iskorišćene suprednosti fazi logike u implementaciji mnogo većeg broja ulaznih i izlaznih veličina zamodeliranje u odnosu na postojeće empirijske modele. Na osnovu identičnih podataka,dobijen je regresioni model predviđanja potresa, da bi se izvršilo testiranje novogmodela. U cilju povećanja pouzdanosti modela predviđanja, ...
    model, predviđanje potresa, miniranje, površinski kop, Monte Karlo, fazilogika, regresiona analiza, FFT analiza, spektri odziva, pomeraj pukotina
    ... 1977, 494. 46. Berta, G., Explosives an engineering tool, Italesplosivi, Milano, Italy, 1990. 47. Persson, P., Holmerg, R. Lee, J. Rock blasting and explosive engineering, CRC Press, Inc, Distributed by International Society of Explosives Engineering, USA, 1994. 48. Dowding, C.H., Construction ...
    ... using various types of neural networks, Soil Dynamics and Earthquake Engineering 30(11), 2010, 1233-1236. 33. Verma, A.K., Singh, T.N., Intelligent systems for ground vibration measurement: A Comparative Study, Engineering with Computers, Epub ahead of print 7 July 2010. DOI: 10.1007/s00366 ...
    ... blasting, open pit mine, Monte Carlo, fuzzy logic, regression analysis, FFT analysis, response spectra, crack displacement Scientific field: Mining Engineering Narrow scientific field: Exploitation of solid mineral raw materials and rock mechanics UDC: 519.87/.245:534.64 614.83:622.235/ ...

  • Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike

    Milanka N. Negovanović (2015-06-30)
    Modeliranje predviđanja potresa tla od miniranja primenom fazi logike i metode MonteKarlo zasnovano je na podacima dobijenim terenskim merenjima potresa uzrokovanihminiranjem. Promenljive modela definisane su analizom parametara bušenja i miniranjaminskih serija, kao i velosigrama izmerenih potresa od miniranja. Iskorišćene suprednosti fazi logike u implementaciji mnogo većeg broja ulaznih i izlaznih veličina zamodeliranje u odnosu na postojeće empirijske modele. Na osnovu identičnih podataka,dobijen je regresioni model predviđanja potresa, da bi se izvršilo testiranje novogmodela. U cilju povećanja pouzdanosti modela predviđanja, ...
    model, predviđanje potresa, miniranje, površinski kop, Monte Karlo, fazilogika, regresiona analiza, FFT analiza, spektri odziva, pomeraj pukotina
    ... 1977, 494. 46. Berta, G., Explosives an engineering tool, Italesplosivi, Milano, Italy, 1990. 47. Persson, P., Holmerg, R. Lee, J. Rock blasting and explosive engineering, CRC Press, Inc, Distributed by International Society of Explosives Engineering, USA, 1994. 48. Dowding, C.H., Construction ...
    ... using various types of neural networks, Soil Dynamics and Earthquake Engineering 30(11), 2010, 1233-1236. 33. Verma, A.K., Singh, T.N., Intelligent systems for ground vibration measurement: A Comparative Study, Engineering with Computers, Epub ahead of print 7 July 2010. DOI: 10.1007/s00366 ...
    ... blasting, open pit mine, Monte Carlo, fuzzy logic, regression analysis, FFT analysis, response spectra, crack displacement Scientific field: Mining Engineering Narrow scientific field: Exploitation of solid mineral raw materials and rock mechanics UDC: 519.87/.245:534.64 614.83:622.235/ ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... knowledge are complementary and intertwine in various ways, the sources of these two types of knowledge and the knowledge acquisition process are in general separated, as higher education offering academic knowledge precedes the solving of practical problems within enterprises that generates expert ...
    ... helps students make their choice of the university that best suits their needs. Besides enhancing cooperation between academia and enterprises in general, our TEL platform can be used as a valuable tool for facilitating and enhancing cooperation between different universities, on issues such as ...
    ... endeavor towards keeping academic curricula up-to-date with novel entrepreneurial knowledge, this has become a critical issue, especially in engineering disciplines. Technological development generates entrepreneurial knowledge at an ever growing pace, whereas changes in academic curricula require ...

  • 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
    ... corpus, whereas the remaining two measures compare term frequency in the domain corpus and the general language corpus, thus illustrating how specific the MWU is for the selected domain. As the general corpus we used a 22 million words excerpt from the Corpus of Contemporary Serbian (SrpKor – ...
    ... avoided as each nominal MWT can have many inflected forms (from five to ten or even more) and many of these forms (but usually not all) can in general be extracted from a corpus. If some statistical approach is used for term extraction, then at least a simple form lemmatization should be performed ...
    ... 5 we give some concluding remarks and present plans for system improvement. 2. Methodology and Design Entries in the Serbian e-dictionary of general multi-word units (MWUs) are classified according to their syntactic structure and inflectional and other properties (omission of a constituent ...

  • 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

  • Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series

    Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)
    Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...
    deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija
    ... Economics Data. J. Syst. Sci. Complex. 2009, 22, 372–394. [CrossRef] 14. Hassani, H.; Mahmoudvand, R. Multivariate Singular Spectrum Analysis: A General View and New Vector Forecasting Approach. Int. J. Energy Stat. 2013, 1, 55–83. [CrossRef] 15. Kalantari, M.; Hassani, H. Automatic Grouping in Singular ...
    ... of the SSA technique was found to be very useful for time series analysis in many different fields, such as medicine, biology, genetics, finance, engineering and many others [15]. The basic concept of the singular spectrum analysis is well presented in the paper by Hassani et al. [16]. Energies 2021 ...
    ... Excavation of an Unstable Slope by Long term Displacement Monitoring. In Proceedings of the International Conference on Case Histories in Geotechnical Engineering, Chicago, IL, USA, 29 April–4 May 2013; p. 42. 8. Zhang, Q.; Li, S.C.; Li, L.P.; Zhang, Q.Q.; Shi, S.S.; Song, S.G. Numerical Analysis of Advanced ...

  • Избор одговарајуће механичке методе

    Анастасија Мирјанић (2024)
    Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина

  • Analiza mogućnosti primene tehnologije hvatanja i skladištenja ugljenika (CO2) na objektima Nis-A

    Isidora Veljanoski (2024)
    U ovom radu opisana je primena CCUS tehnologija u kompaniji NIS i na koji način treba da se optimizuje da bi projekat bio rentabilan.U prvom i drugom poglavlju opisani su energetski trendovi i tranzicije, razvojni mehanizmi za regulisanje emisije gasova staklene baste i o ugljen-dioksidu kao hemijskom jedinjenju i šta je to CCUS.U trećem, četvrtom i petom poglavlju je detaljnije opisano izdvajanje, hvatanje, transport i skladištenje ugljen-dioksida.Šesto poglavlje i sedmo poglavlje obuhvataju rešenja za razvoj i realizaciju CCUS projekata ...
    energetski trendovi, ugljen-dioksid, CCUS, izdvajanje, hvatanje, transport i skladištenje CO2, ležište, ekonomija projekta
    ... of capturing Investment CAPEX capture CAPEX capture CAPEX transport CAPEX compression OPEX capture OPEX transport OPEX compresion General assumptions Discount rate Tax rate Tax property Amortization assumption Generation start year Life time in years Construction time in ...
    ... transport RSD 497,893,120 CAPEX compression RSD 352,780,800 OPEX capture RSD/tCO2 24.60 OPEX transport RSD 150,000 OPEX compresion RSD 200000 General assumptions unit Value Discount rate % 14.0% Taxrate % 15% Tax property % 0.40% Amortization assumption unit Value Generation start year ...
    ... Advance Membrane Science and Technology for Sustainnable Energy and · Environmental — Applications,. URL: https://www.sciencedirect.com/topics/engineering/oxy-fuel-combustion-capture (2011) [13] https://www.globalccsinstitute.com/resources/ccs-image-library/ [14] Pre-Combustion Carbon Capture ...

  • Управљање радом центрифугалних компресора

    Младен Благојевић (2024)
    Овај мастер рад се бави анализом и управљањем рада центрифугалних компресора у индустријским постројењима, са посебним освртом на управљачке системе који осигуравају њихов ефикасан рад. Рад обухвата разматрање различитих система за регулацију протока, притиска и примену савремених метода регулације као што су повратна и напредна. Такође, анализиране су динамичке промене у раду компресора, утицај поремећајних величина и могућности оптимизације. Резултати су показали да правилна примена управљачких система не само да спречава пумпање, већ и повећава стабилност и продуктивност целокупног ...
    центрифугални компресори, управљање компресорима, проток притисак, повратна регулација, напредна регулација, оптимизација
    ... Ha upTexxy OJ1TOBapajy KOHCTaHTHHM BpeJIHOCTHMa ce(biKacHOcCTH KOMIIpecopa 1 Process Control for Compression Systems, Article in Journal of Engineering for Gas Turbines and Power, August 2017. 35 140 120 Pri tis ak - % { st ep en ko mp re si je } -} o o 20 4O 6o BO 1OO0 120 ...
    ... AyroMaTcka peryznanuja KoMiipecopa, 3aBpmrnu paji, Kpacrajar Bakuh, 3arpeo 2015. · Process Control for Compression Systems, Article in Journal Engineering for Gas Turbines and Power, August 2017. .· Linkedin Article, URL: https://www.linkedin.com/pulse/what-does-inlet-guide- vanes-do-compress ...

  • Еоценска фауна југозападног дела Сирт басена (Либија)

    Љупко Рундић, Мери Ганић (2020)
    Еоцен, крупни мекушци, нумулити, ЈЗ Сирт басен, Либија

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... in different natural languages at the same time. One of the open research questions in the keyword extraction task is to develop a method that is general enough for keyword extraction in several lan- guages simultaneously. Therefore, we focus on a method that can be easily ported to a new language. The ...
    ... from the domain of geology and mining in the Serbian and English languages. We show that the selectivity-based keyword extraction (SBKE) method is general enough to be easily ported to another language – Serbian, because it requires only shallow linguistic preprocessing. Then we tested the applicability ...
    ... calculated as: F1 = 2PR P + R . (3) 3 Textual Resources In this experiment, we have used abstracts from the scientific journal “Under- ground Mining Engineering” published by the University of Belgrade, Faculty of Mining and Geology. Apart from technical underground mining related topics, the journal publishes ...

  • Automatic construction of a morphological dictionary of multi-word units

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Duško Vitas, Miloš Utvić (2010)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multiwordn units, noun phrases, query expansion
    ... and maintain, conditions for some 6 Authors Suppressed Due to Excessive Length rules were grouped into general and specific conditions, where specific conditions are simply additions to general conditions. One rule will illustrate this: Fig. 1. The XML Schema for a strategy document
    ... conditions. Table 3. Overview of rules for nouns and adjectives with 2 to 7 components Components Rules for nouns Rules for adjectives (general) (special) (general) (special) 2 26 59 5 9 3 25 85 8 8 4 14 50 5 5 5 6 54 2 2 6 4 29 7 1 9 Total 76 286 20 24 The rules are applied in the sequence in which ...
    ... nxn2m Kneževina Monako Principality of Monaco The second component does not neces- sarily inflect On the basis of this information we got the general idea which combinations of atomic data can we expect to be extracted from dictionaries of simple words and how they combine with inflectional classes ...