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Упит dcterms_subject_txt:variability of coal quality

2861 items

  • 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
    ... level of quality and intensity of scenarios from energy, economic, environmental and social views. The process of compositing fuzzy relationships was done using a “max–min” model of fuzzy composition. One of the key characteristics of the proposed methodology was its attempt to adopt the group of synthetic ...
    ... suppliers determined on the basis of the quality of the government of the Republic of Serbia, as well as 276581 end customers (269380 in regulated supply and 1515 in free market) [71]. The wholesale natural gas market, except for the purchase of gas for the needs of public suppliers, is based on bilateral contracts ...
    ... security of different energy scenarios. Key findings of this methodology can assist in the decision-making process in assessing and choosing quality and effectively direction of energy development. The methodology proposed in the study attempts to analyze and evaluate the energy security situation of the ...

  • Истраживањe могућности коришћења нискотемпературних извора топлоте за одрживи развој енергетике градова

    Miodrag M. Grujić (2014-06-04)
    Одрживост је континуиран процес балансирања између животне средине, економске исоцијалне димензије, који се односи на системска побољшања животног окружења.Енергија се налази међу покретачима одрживог развоја везано за потребу за повећањесоцијалног благостања, његову кључну улогу у економском развоју и утицај на животнусредину. Урбане зоне, као центри потреба за енергијом и емисија угљеника, пружајузначајне могућности за промоцију одрживости енергетског система заједнице.Планирање нових енергетских капацитета, у складу са принципима одрживог развоја,обухвата спровођење политике повећања енергетске ефикасности и увођења обновљивихизвора енергије. Дисертација ставља ...
    одрживи развој, даљинско грејање, модел, сценарио, вишекритеријумскаанализа, нискотемпературни извори, ELECTRE, Београд
    ... Grujić M. Methods of increasing the reliability of belt conveyance systems in coal mines. Konferencija VVaPOL, Podbanske – Vysoke Tatry, 2012. 23. Grujić M, Ristović I, Grujić M. Influence of anchor support of underground transportational chambers on the efficiency of the supply of intermediate goods ...
    ... on of the environment and quantification of damages caused by external coal conveyance. Int. Conference LOADO, Štrpske Pleso, Slovakia, 2009, 338-341. 16. Grujić M, Ristović I, Grujić M. Model for the selection of the optimal location of a thermal power unit according to the external coal conveyance ...
    ... Ivković M. The Impact of Multi Element External Coal Transportation on Reliability of the System and on Environment, 9th International Symposium on Mine Planing and Equipment Selection, Athens, 2000, 569-572. 172 5. Ristović I, Kneţević G, Grujić M. Endanger of Fluvial Ecosystem Due ...

  • Hibridni sistem za planiranje i analizu ventilacije rudnika

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilacija rudnika, informacioni sistemi
    ... book Application of CFD Modeling in Solving Pit Ventilation in the “Soko” Coal Mine CHAPTER 4 MATHEMATICAL DEFINITION OF COMPLEX VENTILATION NETWORKS Characteristics of Mine Ventilation Networks……………………………………………99 Main Characteristics of Network Topography Aerodynamic Resistance of Ventilation Network ...
    ... locations, often with a very complex geometry. The application of CFD software improves the reliability and quality of the apprehension and verification of air amounts needed for the ventilation of workplaces. Beforehand, determination of air amounts relied on the engineering experience or an analogy ...
    ... advisor: Interpretation of geologic signals, Proc. IJCAI-81, pp.846-849, (1981). 16. DE JONG K.A., “An Analysis of the Behavior of Genetic Adaptive Systems”, Disertation Abstracts International, 41(9), 3503B., (1975). 17. DURKIN J., DUSTPRO: A distributed expert system for coal mine dust control, ESD/SMI ...

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • Modeliranje disperzije dimnih gasova iz termoelektrane Kostolac B

    Bojan Živanović (2024)
    Bez hrane se može preživeti nedelju dana, bez vode svega nekoliko dana, međutim, bez vazduha se može preživeti najmanje, nekoliko minuta. Pitanje je kakav uticaj na zdravlje čoveka i okoline ima vazduh koji je lošeg kvaliteta, a kojem je skoro celokupno stanovništvo planete izloženo? Ovaj rad se bavi problematikom modeliranja disperzije dimnih gasova iz novog bloka B3 TE ,,Kostolac’’ B. Ključni momenti koji će biti predstavljeni jesu zagađenje, zdravstveni efekti, modeliranje disperzije i analiza dobijenih rezultata korišćenjem programa AERMOD. Analiziran ...
    zagađenje vazduha, podizanje perjanica, modeliranje disperzije polutanata, TE ,,Kostolac B’’
    ... model which includes SO», NO and suspended particles (PMio) emission. The aim of this model is not only to show the quality of air in the observed area, but to provide a representative impact assessment of work of new B3 section's thermal capacity in “Kostolac B” thermal power station by the ...
    ... dispersion modeling from the B3 block of the Kostolac B power plant Abstract 'Without food a man can survive a week, without water only few days. However, a man can survive shortest without air, few minutes. The question is: what kind of effect does bad-quality air, to which almost entire planet's ...
    ... that some of the old sections be removed from drive into cold reserve or operate less. This has a positive cumulative impact on people”s health, having in mind that these sections, by their project and working properties, have a more significant impact on deterioration of environment quality, compared ...

  • Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++

    Branislava Šandrih, Ranka Stanković (2020)
    U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...
    ekstrakcija terminologije, validacija terminologije, GIZA++, grafovi, Unitex, klasifikacija teksta
    ... that the best results, in terms of quantity and quality of the obtained pairs, were achieved when input sentences were enhanced with ad- ditional bilingual pairs, and when extraction of Serbian terms was performed on the Serbian part of the aligned corpus, instead of aligned chunks. We will continue ...
    ... (LIS-corpus+); 2. The list of domain terms for the source language (Input ii) is (a) the source language part of LIS-dict including SWTs; (b) the output of the extractor Eng-TE applied to the source language part of the aligned input corpus; 3. The extraction of the set of MWTs in the target language ...
    ... problematic characteristics of this expression are (1) syntactic anomaly of the part-of-speech (POS) sequence preposition + con- junction + adjective, (2) non-compositionality: semantics of the whole that is unrelated to the individual pieces, (3) non-substitutability of synonym words (e.g., by and big) ...

  • Using Lexical Resources for Irony and Sarcasm Classification

    Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković (2017)
    The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...
    ... 281 0.198 0.232 0.724 of antonymous pairs, the real meaning of a sarcastic tweet, like in the following example: Sreća pa zimus neće biti uglja, gasa, struje i ogreva jer sa ovim smanjenjem ne bi ni moglo da se plati! (sreća - žalost) ‘Fortunately this winter there will be no coal, gas, electricity or ...
    ... were F1 = 73% for detection of ironic examples and F1 = 93% for detection of non-ironic examples of comparisons. 3 CORPUS OF IRONY One of the first challenges one encounters while trying to solve tasks of automatic recognition of verbal irony is selection of the col- lection of texts andmarking ironic ...
    ... without diacritics (s instead of š, c instead of č or ć, z instead of ž and d or dj instead of đ ), usage of transcribed words instead of words in the BCMS languages, e.g. hepi for happy, and the repetition of some letters for emphasis, e.g. saaad instead of sad ‘now’. The tweet a saaad, sredjivanje sobee ...

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... . Thus, the expansion of the range of terms included in geolISS will continue to be a fundamentally and operationally important task, aimed primarily at a clearer determination of the geologic content and improving the quality of geologic data. Immediate and end users of the information system ...
    ... carried out by the Faculty of mining and geology, University of Belgrade, funded by the ministry of the environment and Spatial Planning of the republic of Serbia. A short history of geolISSTerm and an overview of the structure and the way of arranging terms, in view of the terminological resources and ...
    ... on of the geologic Information System of Serbia (geolISS) in mid- 2006 marked the beginning of development of the geologic terminology and nomenclature. The main aim of the development of this electronic resource was the creation of a standard dictionary of geologic terms for the purpose of providing ...

  • Prirodno prečišćavanje i stimulisana bioremedijacija podzemnih voda zagađenih naftnim ugljovodonicima

    Nenad M. Marić (2016-09-26)
    Disertacija se konceptualno sastoji iz dva dela kojima je obuhvaćen pasivan (prirodnoprečišćavanje) i aktivan remedijacioni pristup (stimulisana bioremedijacija) kodpodzemnih voda zagađenih naftnim ugljovodonicima.U prvom delu disertacije prikazani su rezultati osmatranja procesa prirodnogprečišćavanja u podzemnim vodama na lokaciji istorijskog zagađenja kerozinom.Tragovi zagađenja naftnim ugljovodonicima pronađeni su 20 godina nakon prosipanjakerozina. Ovo je stvorilo osnovu za proučavanje efekata dugotrajne izloženostipodzemnih voda procesima biodegradacije u terenskim uslovima. Uočeno je da sesnižene koncentracije elektron akceptora (O2, NO3-, SO42-) i povišene koncentracijemetaboličkih produkata biodegradacije ...
    podzemne vode, naftni ugljovodonici, kerozin, prirodno prečišćavanje,stimulisana bioremedijacija
    ... Beograd. 64. ISO 10523:200 Water quality - Determination of pH. ISO, Geneve. 65. ISO 11465 (1993) Soil Quality - Determination of dry matter and water content on a mass basis – Gravimetric method, Geneve. 66. ISO 16703 (2004) Soil Quality - Determination of Content of Hydrocarbon in the Range C10 ...
    ... pollution. Ground Water, vol. 13, pp 33-44. 91. Mendizibal I., Stuyfzand P, Wiersma A (2011) Hydrochemical system analysis of public supply well fields, to reveal water – quality patterns and define groundwater bodies. The Netherlands, Hydogeology Journal 19,83- 100 92. Mersmann P (2003) Transport ...
    ... first part of this dissertation, results of the monitoring of natural attenuation processes at a site of historical contamination by kerosene are presented. Traces of petroleum hydrocarbon contamination were found 20 years after the kerosene spill. This provided a basis for the monitoring of long term ...

  • An Italian-Serbian Sentence Aligned Parallel Literary Corpus

    Saša Moderc, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić (2023)
    This article presents the construction and relevance of an Italian-Serbian sentence-aligned parallel corpus, delving into the aligned sentences in order to facilitate effective translation between the two languages. The parallel corpus serves as a valuable resource for language experts, researchers, and language enthusiasts, fostering a deeper understanding of linguistic nuances and cultural expressions. By bridging the gap between Serbian and Italian, this corpus opens new avenues for cross-cultural communication and collaboration, and ultimately contributes to the improvement of language-related ...
    Aligned corpus, parallel corpus, Serbian, Italian, literature

  • Mikroelementi u uljnim šejlovima Aleksinca i njihov uticaj na životnu sredinu

    Nikoleta Aleksić (2021)
    ... growth profile prediction of newly isolated bacterial strains from alkaline soils. Journal of the Science of Food and Agriculture, 100 , 1155-1163. [8] Garcia-Teijeiro R., Lightfoot D., Hernandez J. (2009). Effect of a Chemical Modified Urea Fertilizer on Soil Quality: Soil MicrobialPopulations ...
    ... voda i voda obalnog mora Jugoslsvije, Sl. list SFRJ 6/78. [11] Varol, M., Gökot, B., Bekleyen, A., Sen, B. (2011). Water quality assessment and apportionment of pollution sources of Tigris River (Turkey) using, multivariate statistical techniques – a case study, River Res. Applic. 28(9):1428–1438 [12] ...
    ... elements in coal and their behaviour during combustion in a large power station. Fuel, 74.3, 331-343. SHPIRT. M. YA, S.A.PUNANOVA & STRIZHAKOVA.YU.A. (2007). Trace elements in black and oil shales. Solid Fuel Chemistry, 41, 119-127. SUDERMAN, D. R.; CUNNINGHAM, F. E. (1979). Detection of elements ...

  • Mikroorganizmi - biohidrogeološki indikatori odabranih pojava mineralnih voda Srbije

    Vladimir Šaraba (2021)
    Sa namerom definisanja hidrogeološke uloge i značaja mikrobiološkog diverziteta odabranih pojava mineralnih voda Srbije, primenom sistema biodetektora, dokazano je prisustvo gvožđevitih, sulfato-redukujućih, sluz-produkujućih, heterotrofnih aerobnih i denitrifikacionih bakterija, na osnovu čega je proračunat rizik od razvoja procesa biokorozije i biohemijske inkrustacije, te zdravstveni rizik. Uz procenu rizika, izvedene su analize skenirajuće elektronske mikroskopije biofilmova i hidrogeohemijsko modeliranje, te makroskopska, otpička i difrakciona ispitivanja naslaga inkrustacije, dok je fizičko-hemijskim analizama utvrđena vrednost ukupne mineralizacije iznad 1 g/L, kao i povišeni ...
    biohidrogeologija, SEM analize, makroskopska i optička ispitivanja, rendgenska difrakcija praha, hidrogeohemijsko modeliranje, BART analize, metabarkoding analize mikrobioma, fizičko-hemijske analize, starenje bunara (biokorozija, biohemijska inkrustacija i biozarastanje), zdravstveni rizik
    ... Journal of applied phycology, 20 (3), 227-235. Schmieder, R., & Edwards, R. (2011). Quality control and preprocessing of metagenomic datasets. Bioinformatics, 27 (6), 863-864. Shivani, Y., Subhash, Y., Sasikala, C., & Ramana, C. V. (2017). Characterisation of a newly isolated member of a candidatus ...
    ... (4), 1226-1236. European Union. (1998). Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption. Official Journal of European Communities, L 330, 32-54. Filipović, B., & Stevanović, Z. (1987). Novi prilozi poznavanju termomineralnih voda u Obrenovcu kod ...
    ... survival and growth in drinking water distribution systems. In: Water Quality Technology Conference and Exposition 2012. Toronto, ON, Canada. Enning, D., & Garrelfs, J. (2014). Corrosion of iron by sulfate-reducing bacteria: new views of an old problem. Applied and environmental microbiology, 80 (4) ...

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... Material. Almost half of a poor quality, flatly deformed outer mould with the preserved part of the last and adjacent part of the penultimate whorl (specimen S14.2/2). The ventral side is not visible. Description. Semi-evolute specimen with only slightly arched flanks of whorls falling: smoothly ...
    ... (Ostrava) for taking high-quality photo- graphs of ammonites and aptychi and to K. Slamov4 (Ostrava) for the translation of a substantial part of the manuscript into English and H. Parent for English corrections. This study was supported by the Czech Science Foundation of the Czech Republic, project ...
    ... aff. carpathica. However, it can be assumed that the above specimens show the morphological variability of Strambergella carpathica. Distribution. Strambergella carpathica occurs in the higher part of the Jacobi Zone. Frau et al.(2016a, p.104) report that at Les Combes, France; it is also reported ...

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • 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
    ... according to the procedure proposed by Tziallas et al. [1]. Cylindrical samples, 54 mm in diameter, of rock material were extracted by a high-quality laboratory coring machine with a diamond bit. The ends of the specimens and discs were then cut, polished, and shaped to the required height and diameter ratio ...
    ... length of 535 m, and the average depth per borehole was 133 m [11]. 3. Methodology of Laboratory Tests of Strength Parameters of Heterogeneous Rock Mass Laboratory tests of UCS and triaxial test were performed on samples of homogeneous material and composite samples, for which formation blocks of undisturbed ...
    ... followed by a zone of altered dacite. The zone of altered dacite (AD) is yellowish due to the pronounced limonitization of biotite. After the altered dacite, there is compact dacite (D) of gray color, porphyry structure with pronounced large phenocrysts of feldspar. Precise determination of the boundary between ...

  • Simple 2D gravity–density inversion for the modeling of the basin basement: example from the Banat area, Serbia

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić (2019)
    We have developed a technique to calculate lateral density distribution of the sedimentary basin basement by combining linear gravity–density inversion and 2D forward modeling. The procedure requires gravity anomaly data, depth-to-basement data and density data for the sediments (density–depth distribution). Gravity efect of density variations in the basement was extracted from the total gravity anomaly by removing the joint efect of the sediments with vertical density variations and homogeneous basement of average density contrast (calculated by 2D modeling). Gravity ...
    funkcije raspodele gustine, lateralna raspodela gustine, karta gustine podloge

  • An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)

    N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero (2020)
    Paleontology,Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics,Oceanography

  • Bilingual lexical extraction based on word alignment for improving corpus search

    Jelena Andonovski, Branislava Šandrih, Olivera Kitanović (2019)
    Library and Information Sciences,Computer Science Applications

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... to thermal processes in the overriding plate above subducting slab of the Mesozoic Tethys Ocean. Acknowledgements Guilio Viola and lanko Gerdjikov are gratefully acknowledged for their help on improving the overall quality of the manuscript. This study was financed through the Swiss National ...
    ... Grant from the Freiwillige Akademische GeselIschaft Basel. Con- structive reviews by Nikolay Bonev and Neven Georgiev have helped to improve the quality of this paper. References Anđelković M (1967) Strukturno facijalne zone središnje i istočne Srbije. Zbornik Rudarsko-metalurškog fakulteta i Instituta ...
    ... • bi-afold axis of Fa = byi-afold axis of F+ + bi- afold axis of F, Southern part of the Lmin Lower Caomplex N=6 Fig.4 Lower hemisphere equal-area plots of structural elements from a western part of the Lower Complex, b central part of the Lower Complex, c southern part of the Lower Complex ...

  • Univerzitet u Beogradu Rudarsko-geološki fakultet Master rad Modeliranje disperzije prašine u životnoj sredini u fazi proširenja P.K. Veliki Krivelj

    Magdalena Milanović (2024)
    Modeliranje disperzije zagađenja životne sredine predstavlja proces u kom se korišćenjem matematičkih modela vrši simulacija širenja i raspodele zagađenja u životnoj sredini, koje nastaje određenim aktivnostima. Modeliranje nam pomaže da predvidimo zagađenja koja dobijamo planiranim aktivnostima u zemljištu, vodi i/ili atmosferi određene regije, kako bi na vreme preduzeli odgovarajuće preventivne mere kojim se smanjuje ili upotpunosti eminiše uticaj na životnu sredinu i zdravlje ljudi. Glavni zadatak ovog rada je procena uticaja, projekta proširenja kopa Veliki Krivelj, na kvalitet vazduha. Rezultati koji ...
    Modeliranje disperzije zagađenja životne sredine, površinski kop Veliki Krivelj, AERMOD, zagađenje vazduha, disperzija prašine
    ... Agency, https://www.epa.gov/ [14] European environment Agency, Sources and emissions of alir pollutants in Europe, URL https://www.eea.curopa.ceu/publications/air-quality-in-ecurope-2022/sources-and- emissions-of-air/#fnl [15] Republički hidrometeorološki zavod, Meteorološki godišnjak — klimatološki ...
    ... , Rudarsko-geološki fakultet Univerziteta u Beogradu [11] United States Environmental Protection A gency, Air Quality Dispersion Modeling, URL https://www.epa.gov/scram/air-quality-dispersion-modeling, [12] Studija o proceni uticaja na životnu sredinu projekta proširenja površinskog kopa Veliki ...
    ... радовима запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository ...