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Упит dcterms_subject_txt:Physical and Theoretical Chemistry

2367 items

  • 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
    ... Cercone, Integrating rough set theory and medical applications, Applied Mathematics Letters 21, 2008, pp. 400–403. 27. P. Pattaraintakorn, N. Cercone, A foundation of rough sets theoretical and computational hybrid intelligent system for survival analysis, Computers and Mathematics with Applications ...
    ... on Rough Sets and Soft Computing in Intelligent Agent and Web Technologies, Compiegne, France, September 19, 2005, pp. 49–55. 43. M. Yanga, F. I. Khana, R. Sadiqb, P. Amyotte, A rough set-based game theoretical approach for environmental decision-making: A case of offshore oil and gas operations ...
    ... Mare–a pilot study of magnetic screening, Physics and Chemistry of the Earth, Vol.27, 2002, pp. 1371–1376. 82. N. Eriksson, P. Adamek, The tailings pond failure at the Aznalcóllar mine, Spain, Environmental Issues and Management of Waste in Energy and Mineral Production, Book, Netherlands, 2000, ...

  • Open Educational Resources in Serbia

    Ivan Obradović, Ranka Stanković, Marija Blagojević, Danijela Milošević (2020)
    Open educational resources, BAEKTEL, Metadata portal
    ... Belgrade (Faculty of Mathematics, Faculty of Chemistry, Faculty of Physics, Faculty of Philosophy, University Library "Svetozar Marković" - Department of Scientific Information, University Computer Center), University of Niš (Faculty of Natural Sciences and Mathematics, Teacher's College, University ...
    ... projects and enthusiastic teachers and students gives an excellent base for further development of OER and their effect on teaching and learning process. National community includes educational and industry institutions and also users which collaborate in order to improve OER development and sharing ...
    ... is based, in Item 5 stipulates “openness towards general public and all citizens” and in Item 8 “harmonization with the European system of higher education and enhancement of academic mobility of teaching and non- teaching staff and students”. Finally, Article 32 stipulates that the “competent Ministry ...

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... Serbian, with English and Russian Summaries). Federal Geological Institute, Belgrade, 1–47. Willingshofer E., Neubauer F. & Cloetingh S. 1999: The significance of Gosau-type basins for the late cretaceous tectonic history of the Alpine-Carpathian belt. Physics and Chemistry of the Earth, Part A: ...
    ... direction/dip and stretching lineation trend/plunge taken in the Serbo-Macedonian and Supragetic Unit and at their contact (i.e., measurements taken in the tens of metres wide zone at the contact between the two tectonic units) were separately analysed. By combining map data and our field measurements ...
    ... Serbo-Macedonian Massif and Supragetic units. Sampling site V2. Parallel-polarized lights in c and cross-polarized lights in d and e. f — Top-NE normal sense of shear in the Supragetic unit in cross-polarized lights. Sampling site V1. 402 STOJADINOVIC, KRSTEKANIĆ, KOSTIĆ, RUŽIĆ and LUKOVIĆ GEOLOGICA ...

  • 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 ...
    ... optical character recognition errors, foreign names and abbreviations (Facebook, WWW, HTML, SMS, RNA, ATR, HIV), as well as a number of words belonging to domain-specific terminology, such as: biology - eukariote (eukaryotes), citoplazma (cytoplasm), chemistry - acetilhlorin (acetylchlorine), organele (o ...
    ... dictionaries and previous research into Serbian (Krstev et al. 2015). 3 Analysis and Recognition of Definitions in the SASA Dictionary The first step in our research was a thorough analysis of various lexical and syntactic features of definitions in the Serbian Academy of Sciences and Arts (SASA) ...
    ... Krstev 2012). Finite state transducers are visualized by graphs for easier development and use. A local grammar and its corresponding graph that models (and recognizes) definitions of nouns that represent attributes and/or state is given in Figure 1. Below the graph, six definitions are listed that are ...

  • Старење бунара у алувијалним срединама различитог степена оксичности

    Brankica Majkić (2013-09-27)
    Старење бунара настаје као последица процеса корозије и колмирања. Процесекорозије могуће је спречити уградњом филтерских конструкција од материјалаотпорних на корозију. Колмирање може да настане без обзира на врсту материјалаод кога се праве бунарске конструкције, а процесом може бити захваћенаприфилтарска зона па и зона саме водоносне средине. Из тог разлога тезa јеусмеренa на процесе који доводе до колмирања бунара и последицe опадањaкапацитета водозахватних објеката. Полазна хипотеза је да бунари стареразличитом брзином у срединама различитог степена оксичности. Хидрохемијскеи микробиолошке карактеристике подземних ...
    старење бунара, алувијалне издани, степен оксичности средине,колмирање, бунарски талог, локални хидраулички губитак, дозвољене улазнебрзине
    ... басена, Задужбина Андрејевић, п.92 126. Stumm, W. and J.J. Morgan (1996): Aquatic Chemistry, Chemical Equilibria and Rates in Natural Waters, 3rd ed. John Wiley & Sons, Inc., New York, 1022p. 127. Stuyfzand PJ (1993) Hydrochemistry and hydrology of the coastal dune area of the Western Netherlands ...
    ... Y. and H.W. Pepenguth (2000): Kinetic modeling of microbial-driven redox chemistry of radionuclides in subsurface environments: coupling transport, microbial and geochemistry www.osti.gov/bridge/servlets/purl/755470-3PElV2/.../755470.pdf 176. Wastal J. (2000): Geochemical equilibrium and int ...
    ... Standard Practices for Sampling Water-Formed Deposits, USA 181. International Union of Pure and Applied Chemistry (1993): Glossary for chemists of terms used in toxicology: Pure and Applied Chemistry, v. 65, no. 9, p. 2003-2122. 182. National Research Council (1994): Alternatives for ground ...

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... refinements of tremolite at 140 and 295 K: Crystal chemistry and petrologic implications. Am. Mineral. 1996, 81, 1117–1125. [CrossRef] Gatta, D.G.; Merlini, M.; Valdrč, G.; Liermann, H.-P.; Nenert, G.; Rothkirch, A.; Kahlenberg, V.; Pavese, A. On the crystal structure and compressional behavior of talc: ...
    ... How to conciliate antagonist physical and chemical requirements. Ann. Chim. Sci. Materiaux 2005, 30, 673–688. [CrossRef] Hulthen, B. On ceramic ware in northern scandinavia during the neolithic, bronze, and early iron Age: A ceramic-ecological study. In Archaeology and Environment Series (e-book) ...
    ... ine are found in samples a, b and d, while albite is found only in samples a and b. Crocidolite is found in samples b and d, while tremolite is found in samples b and c. Diopside and orthopyroxene are found in samples b and c, while talc is found in samples c and d. Minor abundant mineral phases ...

  • 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
    ... coal roof and coal fioor. Coal gasification chemistry includes Gasification cavity shape seven primary reactions occurring within the with CRIP layer. The primary reaction that happens is the displacement reaction of the generated water vapor (H.O) and gas, where water vapor and carbon from ...
    ... the massif, unlike surface waters, have been ex- posed to significantly different physical-chemical conditions and interdependencies, where the concentration of dissolved substances in them is much more diverse and changes according to the specific rules all the time. This is especially the case ...
    ... can be carried out, depending on the hydrogeological conditions, with various physical barriers that constrain further dissemination. The aim of reconstruction measures is to liquidate the pollution of the aquifer and establish the natural quality of groundwater. This can be done by pulling out ...

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... actor in pipe. Industrial and  Engineering Chemistry Fundamentals 18(3), 296–297. (на енглеском)  ‐ 188 ‐ Дејан Бркић, Докторска дисертација      68. Chen, N.H. 1980. Comments on “An explicit equation for friction factor in pipes”.  Industrial and Engineering Chemistry Fundamentals 19(2), 229–230 ...
    ... for turbulent flow friction factor calculation. Industrial and Engineering Chemistry  Research 46(8), 2593‐2600. (на енглеском)  262. Spriggs, H.D. 1973. Comments on transition from laminar to turbulent flow. Industrial  and Engineering Chemistry 12(3), 286‐290. (на енглеском)  263. Spriggs, H.D. 1973 ...
    ... ebrook equation. Industrial and  Engineering Chemistry Research 48(7), 3665–3671. (на енглеском)  76. Coelho, P.M., Pinho, C. 2007. Considerations about equations for steady state flow in  natural gas pipelines. Journal of the Brazilian Society of Mechanical Sciences and  Engineering 29(3), 262‐273 ...

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... actor in pipe. Industrial and  Engineering Chemistry Fundamentals 18(3), 296–297. (на енглеском)  ‐ 188 ‐ Дејан Бркић, Докторска дисертација      68. Chen, N.H. 1980. Comments on “An explicit equation for friction factor in pipes”.  Industrial and Engineering Chemistry Fundamentals 19(2), 229–230 ...
    ... for turbulent flow friction factor calculation. Industrial and Engineering Chemistry  Research 46(8), 2593‐2600. (на енглеском)  262. Spriggs, H.D. 1973. Comments on transition from laminar to turbulent flow. Industrial  and Engineering Chemistry 12(3), 286‐290. (на енглеском)  263. Spriggs, H.D. 1973 ...
    ... ebrook equation. Industrial and  Engineering Chemistry Research 48(7), 3665–3671. (на енглеском)  76. Coelho, P.M., Pinho, C. 2007. Considerations about equations for steady state flow in  natural gas pipelines. Journal of the Brazilian Society of Mechanical Sciences and  Engineering 29(3), 262‐273 ...

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... the observed phenomenon was performed. Theoretical value of a particular partial indicator (economic feasibility (A2), affordability (A3), availability of energy (S1), diversification of sources and routes (S2), infrastructure development (S3), GHG emission (E1) and pollutant emission (E2)) can be determined ...
    ... scenario was defined using the average deviation between the real and theoretical values. The value for the class as representative of the unit of measure of the indicator (j) was defined taking into account the lowest recorded deviation (j = 10) and the largest recorded deviation (j = 1). (III) Ranking was ...
    ... Author Contributions: Conceptualization, A.R.M. and D.D.I.; methodology, M.L.T. and A.R.M.; supervision, M.A.Ž. and D.D.I.; validation, D.D.I. and M.A.Ž.; formal analysis and writing—original draft A.R.M.; investigation, A.R.M. and M.L.T. All authors have read and agreed to the published version of the manuscript ...

  • ‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions

    Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban (2020)
    Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...
    Firing, Glaze, Traditional ceramics, Provenance studies, Augite

  • 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
    ... Wikipedia. In Proceedings of the 9th Global WordNet Conference (GWC 2018), pages 62–69. Meyer, C. M. and Gurevych, I. (2011). What psycholin- guists know about chemistry: Aligning Wiktionary and WordNet for increased domain coverage. In Proceedings of 5th International Joint Conference on Natural ...
    ... 2005; Ponzetto and Navigli, 2010; Niemann and Gurevych, 2011; Mc- Crae, 2018)), with the Longman Dictionary of Contempo- rary English and with Roget’s thesaurus (Kwong, 1998), with Wiktionary3 (Meyer and Gurevych, 2011) or with the Oxford Dictionary of English (Navigli, 2006). Meyer and Gurevych (2011) ...
    ... sense representations and decrease sense granularity (Miller, 2016). Miller and Gurevych (2014) describe a technique for constructing an n-way alignment of LSRs and applied it to the produc- tion of a three-way alignment of the English WordNet, Wikipedia and Wiktionary. Niemann and Gurevych (2011) propose ...

  • Model inteligentnog sistema adaptivnog upravljanja procesom prerade rude

    Ivana M. Jovanović (2016-01-13)
    U oblasti procesa prerade rude, flotacijska koncentracija predstavlja jednu od najznačajnijih i najčešće primenjivanih metoda separacije korisnih od nekorisnih minerala. Samim tim, veoma je važno osigurati uspešan rad flotacijskog postrojenja kroz dostizanje zadovoljavajućih tehno-ekonomskih pokazatelja. Cilj upravljanja procesom flotacijske koncentracije je upravo optimizacija kvaliteta i iskorišćenja korisne komponente u koncentratu uz maksimizaciju profita. Shodno tome, istraživanja na polju modelovanja i upravljanja ovim procesom zauzimaju značajno mesto u praksi kontolnog inženjenringa.Teorijska istraživanja u okviru doktorske disertacije obuhvatila su analizu položaja ...
    flotacijska koncentracija, modelovanje, upravljanje, inteligentni sistem, soft kompjuting, fazi logika, veštačke neuronske mreže
    ... Modeling of the Overall Process. In: Coagulation and Flocculation,(Edited by H. Stechemesser and B. Dobiáš), pp. 455-517 253. Schumann, R., 1942. Flotation Kinetics. Part 1. Methods for Steady-State Study of Flotation Problems. Journal of Physical Chemistry, Vol. 46, pp. 891-902 254. Shahbazi, B., Rezai ...
    ... concentrate grade and recovery, while maximizing profits. Consequently, research into the modelling and control of this process have always been an important area in control engineering practice. Theoretical research within the dissertation included an analysis of the position and role of different ...
    ... cells from cell design and operating data. Minerals Engineering, Vol. 12, No. 3, pp. 309-322 84. Gouws, F.S., Aldrich, C., 1996. Rule-Based Characterization of Industrial Flotation Processes with Inductive Techniques and Genetic Algorithms. Industrial & Engineering Chemistry Research 35, pp. 4119–4127 ...

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... the quality and accuracy of the input thematic data and particularly to the landslide inventory used to train the model, (2) the absence of expert opinion which may result in a satisfactory statistical output in terms of degree of fit, but may not be realistic in terms of physical meaning, (3) the ...
    ... regional scale is suggested grid cell size of 100x100m) gives its Total Landslide Susceptibility Rating (TLSR). The maximum possible theoretical value of the TLSR is 10.0 and the minimum possible value is 0.3. The following relationship is adopted: TLSR100-500 = LT-R + SI-R + AP-R + EI-R + LU-R (1) Where: ...
    ... landslides were defined as translational and rotational debris and earth slides and rock falls. Over 60% of the occurrences have been defined as intermediate and deep, and those mostly occurred in debris material overlying hard rock masses or in fluvioglacial and proluvial sediments. The depth of some ...

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... classical mathematics to fuzzy mathematics: Emergence of a new paradigm for theoretical science. In: Handbook of the history of logic, Vol. 8, (2008), Elsevier, Oxford. Forman, E., Peniwati, K., 1998. Aggregating individual judgments and priorities with the analytic hierarchy process. European J Oper Res 108 ...
    ... To compare M1 and M2, it is needed to calculate both the values of V(M1≥ M2) and V(M2≥ M1). The degree possibility for a convex fuzzy number to be greater than k convex fuzzy numbers Mi (i = 1,2, . . . , k) can be defined: V (M ≥ M1,M2, . . . ,Mk) = V [(M≥M1) and (M ≥ M2) and . . . and (M ≥ Mk)] = min ...
    ... Wang et al. (2020) integrated the FAHP and SWOT model for choosing and assessing the strategic renewable energy tech- nologies in Pakistan by considering four indicators and 17 sub- indicators. Various decision-making approaches, such as TOPSIS, VIKOR, and fuzzy analysis, were explored to subsequently ...

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... assessing underground hazard, in: Rockbursts and Seismicity in Mines (N.C. Gay and E.H. Wainwright, eds.), South African Institute of Mining and Metallurgy, Johannesburg, Symposium Series No. 6, pp. 199-208, Burridge, R., and Knopoff, L. Model and theoretical seismicity, Bulletin of Seismological ...
    ... delay for the analysis of chaotic time series, Physical Letters A 142, 107-111. 102.Lise, S. Paczuski, M. 2001. Self-organized criticality and universality in a nonconservative earthquake model, Physical Review E 63, 036111-1-5. 103.Lorig, L., and Hobbs, B. 1990. Numerical modeling of slip instability ...
    ... 163.Scholz, C.H. 1998. Earthquakes and friction laws, Nature 391, 37-42. 164.Schreiber, T. 1997. Detecting and analyzing nonstationarity in a time series with nonlinear cross-predictions. Physical Review Letters 78, 843-846. 165.Sibson, R.H. 1977. Fault rocks and fault mechanisms, Journal of the ...

  • Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija

    Srđan D. Kostić (2013-11-04)
    U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...
    potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja
    ... assessing underground hazard, in: Rockbursts and Seismicity in Mines (N.C. Gay and E.H. Wainwright, eds.), South African Institute of Mining and Metallurgy, Johannesburg, Symposium Series No. 6, pp. 199-208, Burridge, R., and Knopoff, L. Model and theoretical seismicity, Bulletin of Seismological ...
    ... delay for the analysis of chaotic time series, Physical Letters A 142, 107-111. 102.Lise, S. Paczuski, M. 2001. Self-organized criticality and universality in a nonconservative earthquake model, Physical Review E 63, 036111-1-5. 103.Lorig, L., and Hobbs, B. 1990. Numerical modeling of slip instability ...
    ... 163.Scholz, C.H. 1998. Earthquakes and friction laws, Nature 391, 37-42. 164.Schreiber, T. 1997. Detecting and analyzing nonstationarity in a time series with nonlinear cross-predictions. Physical Review Letters 78, 843-846. 165.Sibson, R.H. 1977. Fault rocks and fault mechanisms, Journal of the ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... constituents influenced by water level, regional depositional and paleo­environmental factors, which control the enrichment or depletion of the different ele­ ments and mineral phases contained in the coal. Chemical, bio­ logical and physical factors in mire systems provide specific en­ vironments in which ...
    ... Faculty of Mining and Geology, Đušina 7, 11000 Belgrade, Serbia; (corresponding author: dragana.zivotic@rgf.bg.ac.rs; tel: +381 11 3219 251; fax: +381 11 3235 537) 2 Center of Chemistry, IChTM, Studentski trg 12–16, 11000 Belgrade, Serbia 3 University of Belgrade, Faculty of Chemistry, Studentski trg ...
    ... crusts built up of small flakes and usually appears in association with haematite and other minerals including siderite and clays. The Fe­Mn oxides and Mn hydroxides were also detected in small amounts in coal seams I and II. The Ti and Ti­Fe oxides (rutile and ilmenite; Fig. 4i, j) oc­ cur as small ...

  • Uticaj utiskivanja gas-lift gasa na prenos mase i toplote

    Branko Grubač (2019)
    Nakon uvođenja kontinualnog gas-lifta, primećen je porast proizvodnje tečnog naftnog gasa, TNG, u postrojenju za preradu gasa, kao jednog od finalnih proizvoda dobijenog iz fluida gaso kondenzatnih i rastvorenog gasa iz naftnih bušotina. Pretpostavljeno je da se prisustvom gas-lift gasa uspostavlja drugačija ravnoteža faza u odnosu na slučaj bez gaslifta, te da je gas-lift gas stripovao propan i butane iz tečne u parnu fazu, što je dovelo do povećanja prinosa TNG-a. Napravljen je model bušotine koja radi u kontinualnom gas-liftu ...
    gas-lift, modelovanje bušotine, prenos mase i toplote, taloženje parafina
    ... (2005) [97] M. Jorda, Paraffin deposition and prevention in oil wells, Society of Petroleum Engineers, SPE paper, str 1605-1612, (1966) [98] Z. Huang, S. Zheng, S. Fogler, Wax deposition experimental characterizations, theoretical modeling, and field practices, Taylor & Francis Group, CRC Press ...
    ... Technology, Vol. 25, str 607-617, (1973) [73] A. Dukler, M. Hubbard, A model for gas-liquid slug flow in horizontal and near horizontal tubes, Industrial & Engineering Chemistry Fundamentals, Vol. 14, str 337-347, (1975) [74] D. Viswanath, Viscosity of liquids, Springer, (2006) [75] H. Zhang ...
    ... predicting wax precipitation and deposition, Society of Petroleum Engineers, SPE paper, str 121-126, (1988) [96] W. Ming, Q. Shujuan, L. Jianfeng, Z. Ling, Prediction model based on the theory for tackling wax deposition in oil pipelines, Journal of natural gas chemistry, Vol. 14, str 243-247, (2005) ...