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272 items

  • Model za optimizaciju graničnog saržaja metala u rudi u funkciji dugoročnog planiranja površinskih kopova

    Daniel P. Kržanović (2016-06-14)
    Optimizacija graničnog sadržaja metala u rudi jedan je od osnovnih koraka u planiranju i dizajniranju površinskih kopova i ima za cilj postizanje maksimalne neto sadašnje vrednosti (NPV). Iz tog razloga, optimizacija graničnog sadržaja i danas je predmet mnogih istraživanja u rudarskoj nauci, sa ciljem rešavanja praktičnih problema u eksploataciji ležišta.Dugoročno planiranje eksploatacije na površinskim kopovima podrazumeva sagledavanje svih relevantih parametara i faktora (geologije rudnog ležišta, tehnologije proizvodnog procesa, kapaciteta otkopavanja i prerade, troškova, cena metala, iskorišćenja i dr) kako ...
    površinski kop, dugoročno planiranje, optimizacija graničnog sadržaja, maksimizacija neto sadašnje vrednosti (NPV).
    ... pp. 811-829. Lane, K.F., 1988, The Economic Definition of Ore: Cutoff grades in Theory and Practice, Mining Journal Books Ltd, London. Lane, K.F., 1997, The Economic Definition of Ore, Cut-off grades in theory and practice, Second Edition, Mining Journal Books Limited, London, 147 pp. Lerchs ...
    ... using optimum control theory. APCOM 87, Proceedings of the Twentieth International Symposium on the Application of Computers and Mathematics in the Mineral Industries, Volume 3: Geostatistics, Johannesburg, SAIMM, pp. 263-269. Zhao, H., Kim, Y., 1992, A new graph theory algorithm for optimal ...
    ... Institute of Mining and Metallurgy, vol. 111, pp. 741-750. Askari-Nasab, H., Awauh-Offei, K., 2009, Open pit optimisation using discounted economic block values, Mining Technology, vol. 118, pp. 1-12. Ataei, M., Osanloo, M., 2003, Determination of optimum cutoff grades of multiple metal deposits by ...

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... at room tem- perature, crushed, and pulverized. �e crushed fraction (< 2 mm) was used for preparing petrographic “whole rock” specimens (polished block), and the pulverized rock (0.10–0.25 mm) was used for Rock-Eval pyrolysis. Methods In this study, common analytical methods were used: Rock-Eval ...
    ... at room tem- perature, crushed, and pulverized. The crushed fraction (< 2 mm) was used for preparing petrographic “whole rock” specimens (polished block), and the pulverized rock (0.10-0.25 mm) was used for Rock-Eval pyrolysis. Methods In this study, common analytical methods were used: Rock-Eval pyrolysis ...
    ... pyrolysis documented before and after extraction revealed that free hydrocarbons (bitumen) in the surface samples analysed suppress the T max values. Key words : Petroleum, Rock-Eval, vitrinite reflectance, maceral, thermal maturity. Manuscript received 19 March 2021, accepted 21 August 2021 INTRODUCTION ...

  • 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
    ... strateškog odlučivanja. 154 7. LITERATURA [1] A. Swishchuk., A. Ware., H. Li., Option Pricing with Stochastic Volatility Using Fuzzy Sets Theory, Northern Finance Association 2008 Conference Paper, http://www.northernfinance.org/2008/papers/182.pdf [2] Bellman, RE.; Zadeh, LA.: Local and ...
    ... Teorija grafova i njene primene, IDP Naučna Knjiga, Beograd, 1990, ISBN 86-23-20206-6. [12] Dubois, D., Prade, H. (1980). Fuzzy Sets and Systems: Theory and Applications, New York: Academic Press. [13] Đanković, V. G. Egzistencija i jedinstvenost rešenja i metode za rešavanje nekih klasa stohastičkih ...
    ... 2, (2010), pp. 1408-1418. [18] Goguen J. A., The logic of inexact concepts, Synthese, 1969, 19, pp. 325-373. [19] H. J. Zimmermann, Fuzzy set theory, Advanced review, Volume 2, May/June 2010, John wiley & Sons, Inc. pp.317-332. [20] Hall, B.E., A Quantitative Assessment of the Factors Influencing ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... made the most significant contribution to the theory of water circulation and the function of karst aquifer (Mijatović, 1989, 1997: Milanović 1979; Stevanović & Mijatović, 2005; Stevanović & Milanović, 2013). Cvijić (1918) also described his own theory of superposition of “hydrographic zones in karst' ...
    ... 978-3-642- 2485-3, pp.415-421, https://doi.org/10.1007/978-3-642-12486-0 64 'Kresic, N., Stevanović, Z. (Eds.) (2010): Groundwater hydrology o springs: Theory, management, and sustainability, Elsevier, 574 pp., Burlington-Oxford Stevanović, Z.(2010): Management of karstic aquifer of regional water system ...
    ... 2668 (h-indeks 22), a prema Research Gate-a 1675 (h-indeks 20). Monografije renomiranih izdavača su: Groundwater Hydrology of Springs: Engineering, Theory, Management and Sustainability (Elsevier, 2010), Karst Aquifer Characterization and Engineering (Springer, 2015) and Karst without Boundaries (CRC ...

  • Razvoj integralnog modela za optimizaciju diskontinualnog sistema proizvodnje na površinskim kopovima nemetala

    Miodrag Čelebić (2024)
    Izbor optimalne mehanizacije u diskontinualnom sistemu transporta je jedna od najvažnijih odluka koju treba donijeti prilikom projektovanja površinskih kopova. Pri izboru optimalne mehanizacije, uticaj ima veliki broj faktora, kako prirodnih – geoloških i ekoloških, tako i tehničkih, ekonomskih i socijanih. Neki od njih se mogu izraziti numerički, u određenim mijernim jedinicama, a neki opisno, lingvističkim varijablama, shodno uslovima koji vladaju na rudnim ležištima, a koje karakterišu visok stepen neizvjesnosti i neodređenosti kako prilikom istraživanja, tako i tokom procesa eksploatacije ...
    izbor mehanizacije, tehnologija eksploatacije, diskontinualani sistem, ekspertsko odlučivanje, lingvističke varijable, MCDM, FAHP

  • Vebran Web Services for Corpus Query Expansion

    Ranka Stanković, Miloš Utvić (2020)
    U ovom radu se govori o razvoju veb usluga Vebran i njihovoj primeni u poboljšanju pretraživanja korpusa. Veb-servisi Vebran koriste se za konsultovanje spoljnih leksičkih izvora za srpski jezik (uglavnom elektronski morfološki rečnici i srpski Vordnet) i proširivanje korisničkih upita radi dobijanja relevantnijih rezultata iz srpskih korpusa.
    corpus search, web service, Serbian lexical resources, query expansion
    ... equivalents of definitions are in the database). Externally developed Dictionary of library and information sciences10 encompasses the terminology of theory and practice of librarianship and in- formation sciences and a wide range of close or related fields, in Serbian, English and German languages. The ...

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... The Open Courseware Movement in Higher Education: Unmasking Power and Raising Questions about the Movement's Democratic Potential. Educational Theory, 63(1), 87-110. Stanković, R., Obradović, I., Kitanović, O., Prodanović, J., Ilić ,V. (2011) An approach to implementation of blended learning ...
    ... related to artificial intelligence methods and tools, language resources and tools, and e-learning applications in higher education. He was one of the key persons in several scientific projects related to human language technologies and e-learning. Ranka Stanković is associate professor at University ...

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... Chemical Geology 120, 223–253. https://doi.org/10.1016/0009- 2541(94)00140-4 McIntire W.L. 1963: Trace element partition coefficients – a review of theory and application to geology. Geochimica et Cosmo­ chimica Acta 27, 1209–1264. https://doi.org/10.1016/0016- 7037(63)90049-8 Meinert D.L. 1992: Skarns ...

  • Hibridni sistem za planiranje i analizu ventilacije rudnika

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilacija rudnika, informacioni sistemi
    ... contemporary mine theory and practice differs substantially from the traditional approach. The novel approach uses all possibilities offered by computer hardware and software that are at the disposition of mine engineers. Software packages for mine ventilation simulation obtained a key role in the process ...
    ... of matter in turbulent flow through a pipe", Proc. R. Soc. Lond., 233, 945, (1954). 87. TOMIYAMA T., YOSHIKAWA H., Extended generaldesign theory, Design Theory for CAD, pp 95- 130, North-Holland, Amsterdam, (1987). 88. UENG T.H., WANG Y.J., "Analisys of Mine Ventilation networks using Nonlinear P ...
    ... planing", Third International Mine Ventilation Congres, Harrogate, 397-404., (1984). 6. BIENIAWSKI Z. T., Design methodology in rock engineering, Theory, education and practice, Balkema, (1992). 7. BOOCH G., Object Oriented Analysis & Design with Applications, (1994). 8. BRITTON S., Computer-based ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • On the distribution modulo 1 of the sum of powers of a Salem number

    Dragan Stankov (2016)
    It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • The external aggregation Newton's method for solving nonlinear equations and applications

    Marija Paunović, Dejan Ćebić, Nebojša Ralević (2020)
    Њутнов метод, агрегациона функција, ред конвергенције

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... material and composite samples, for which formation blocks of undisturbed rock material (maximum dimensions of 30 cm × 30 cm × 30 cm) were used. Rock block samples of altered dacite were taken from the open pit bench at an elevation of 575 m a.s.l. and dacite at an elevation of 505 m a.s.l. (Figure 2), ...

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Развој модела употребног квалитета помоћне механизације на површинским коповима лигнита

    Драгица Јагодић Крунић (2021)
    Тренутно стање помоћне механизације на површинским коповима лигнита је незадовољавајуће узроковано пре свега старошћу и неблаговременом заменом машима услед чега је расположивост недовољна а трошкови експлоатације и одржавања високи. Тренутно стање и захтеви који се постављају пред ове машине указују на неопходност оптимизације процеса управљања помоћном механизацијом. Одређивање оптималног времена замене и преосталих могућности је најодговорнији управљачки задатак који треба да буде заснован на свеобухватном сагледавању економских, техничких и других узрочно последичних веза. Са економског аспекта гледано треба одржавати ...
    помоћна механизација, употребни квалитет, ефективност, расположивост, сигурност функционисања, ризик, трошкови животног циклуса, фази логика, Монте Карло метода
    ... fuzzy sets theory, Expert Systems with Applications, 2012, Vol. 39 No.10, pp. 8940-8946. [10] Tanasijevic, M. i dr., A Fuzzy-Based Decision Support Model for Effectiveness Evaluation - a Case Study of the Examination of Bulldozers, International Journal of Industrial Engineering: Theory, Applications ...
    ... традиционалном FMEA. Jihyun Park, Changsoon Park, Suneung Ahn у раду „Assessment of structural risks using the fuzzy weighted Euclidean FMEA and block diagram analysis” [23] дају критички став на метод Анализе начина и ефеката отказа – FMEA и предлажу одговарајуће корективне мере. Иако се FMEA технике ...
    ... састављени од више хијерархијски и функционално повезаних компоненти (систем-подсистем-склоп-елемент), уз помоћ блок-дијаграма поузданости (Reliability Block Diagram – RBD) који описује повезаност компоненти унутар техничког система према поузданости. Ова метода омогућава успостављање узрочно последичних ...

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    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, multi-word units, noun phrases, query expansion
    ... 48–55. [14] E. Wehrli, V. Seretan, and L. Nerima, “Sentence Analysis and Colloca- tion Identification,” in Proc. of the Multiword Expressions: From Theory to Applications — MWE 2010, Beijing, China, 2010, pp. 28–36. ...
    ... submitted to the Google search engine [10]. The main feature of VeBrana is that it enables inflection of simple words, MWUs and free phrases supplied as key-words to Google. The tool relies on Serbian e-dictionaries, inflection transducers for simple words and MWUs, and uses Unitex and Multiflex modules ...

  • 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)
    ... [4] Ivanović B., (1973): Theoretical Statistics, Naučna knjiga, Belgrade, pp. 90 (in Serbian). [5] Simonović V., (1995): Introduction to the Theory of Probability and Mathe- matical Statistics, TEKON - Tehnokon- salting, Belgrade, (in Serbian). [6] Vukadinović S., (1970): Elements of Probability ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... Sweden. pp. 1318–1327. Kilgarriff, A. & Rychlý, P. (2010). Semi-Automatic Dictionary Drafting, In A Way with Words: Recent Advances in Lexical Theory and Analysis. Uganda: Menha Publishers Ltd., pp. 299-312. Kitanović, O., Stanković, R., Tomašević, A., Škorić, M., Babić, I. & Kolonja, Lj. 2021 ...
    ... sentences. Each sentence class is then generated by a grid of word classes (each class is either a high-frequency word or a word’s part-of-speech). A key feature of the approach is the ability to identify definitions and isolate hypernyms. The task of automatic definition extraction can be formalized ...

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... calculation and mapping integrated into the SAT is developed 326 by Fu P. and Rich P.M. (in 2000). This tool, which is based on solar geometrical theory, counts incoming solar radiation for each pixel of a DEM. The DEM provides information about the morphology of the area (elevation, slope, and ...

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... did not involve calculation. Miller and Friedman (1957) wrote about the reconstruction of mutilated texts from the point of view of the information theory in order to calculate the redundancy in English texts. The problem discussed at that time was how many characters can be omitted while still allowing ...
    ... cognitive errors caused by a misunderstanding of the correct spelling of a word (Kukich, 1992). Errors of the first type can be tackled in terms of keyboard key proximity, while errors of the second type are lan- guage dependent and are the result of user’s (mis)understanding of relevant orthographic rules. Both ...