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Упит dcterms_subject_txt:ratio of modified secondary and primary compression index

2749 items

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... it is analyzed a typical stove in Serbian households, and in the case of pellet-based, a modern wood pellet-based furnace is analyzed. The objective of the LCA study is to assess the environmental performance of heating systems using GWP index, expressed through CO2-eq emissions. According to the ...
    ... Office of the Republic of Serbia [5], solid fuels (wood and coal) are used in 56.6% of households for heating in Serbia. The usage of wood biomass for heating in Serbia is characterized by excessive use of firewood for heating without adequate replanting, minimal use of wood residues, and low wood ...
    ... Ivezić, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia, dejan.ivezic@rgf.bg.ac.rs 3 Associate Professor, Ph.D., Marija Živković, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia, marija.zivkovic@rgf.bg.ac.rs Life Cycle Assessment of Individual wood ...

  • A WordNet Ontology in Improving Searches of Digital Dialect Dictionary

    Miljana Mladenović, Ranka Stanković, Cvetana Krstev (2017)
    In this paper, we present a method for automatic generation of a digital resource, which connects all indirect synonyms of a dialect term to all indirect synonyms of a corresponding term in the standard language, aiming to improve the search of a digital dialect dictionary. The method uses SWRL rules defined in the Serbian WordNet ontology to identify sets of synonymous words. It also uses e-dictionaries to produce correct lemmas in standard language that users usually employ in searches. ...
    ... sharing, visu- alization and analysis of digital dialect dictionaries. This includes: the develop- ment of digital dictionaries of dialects [4], [13], [1], the development of tools for the management of dialectal dictionaries [10], the software for data visualization and presenting of linguistic dialectal ...
    ... terms and examples of the use of words or phrases as they are spoken in the dialect; graphic information about the geographical location using concepts of Google Maps; the etymological origin of the words, morphological information like part of speech, and additional semantic data. The content of the ...
    ... existence of the indirectSynonymy relation and, after inferencing, 6,430 indirectSynonymy related pairs of verbs. 4 The implementation of new search features The proposed method for connecting the standard language with the dialect dictionary relies on a table of sets of synonymous words of the standard ...

  • Српски језик у дигиталном добу -- The Serbian Language in the Digital Age

    Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević (2012)
    Serbian language
    ... Literature is one of the most important subjects in primary and secondary school. However, instruction is focused on proper writ- ing and speech, knowledge about the language (gram- mar and lexis), knowledge about the history of the lit- erary (written) languages of the Serbs and about the origin of standard ...
    ... 48 struction, textbooks and readers are published in these languages (for example, in 2005 a total of 526 textbooks for primary and 283 for secondary school were pub- lished) [9]. Official use of minority languages is regulated by the Law on the Official use of Language and the Alpha- bet [12], which ...
    ... for 0.8% of the population these data are unknown. In Serbia, primary and secondary school education exists in some of the minority languages, namely in Albanian (55 pri- mary/4 secondary schools), Hungarian (108/38), Bul- garian (26/-), Romanian (27/2), Ruthenian (3/2), Slo- vak (15/2) and Croatian ...

  • Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik

    Dragoslav Rakić, Radojica Lapčević, Irena Basarić Ikodinović, Dragan Lukić (2022)
    Tunel „Debelo brdo“ nazvan je po najizraženijem relјefnom obliku na ovoj drugoj deonici autoputa E-80 Niš – Pločnik. Osnovnu geološku građu na lokaciji tunela čini Mio-Plioceni kompleks heterogenog litološkog sastava. Izgradnja tunela je predviđena delom u otvorenom iskopu dužine 240 m, a delom sa podzemnim iskopom dužine 190 m. U zoni tunela, padina je okarakterisana kao uslovno stabilna, pa bi neadekvatna zasecanja mogla da izazovu klizanja terena. Iz tih razloga, u okviru rada posebno su prikazani geotehnički uslovi izgradnje ...
    Tunel „Debelo brdo“, Geotehnički parametri, Privremene kosine, Šipovi, Podgrada.
    ... sliding of the terrain. For these reasons, the paper presents separately the geotechnical conditions for the construction of the tunnel in open excavation (temporary excavation securing by installing piles is provided), and the geotechnical conditions for tunnel excavation with a partially modified model ...
    ... CONSTRUCTION OF ON THE HIGHWAY E- - 1, 2 Ikodinovi 3, 4 1 University of Belgrade Faculty of Mining and Geology, Djusin 7, Belgrade, dragoslav.rakic@rgf.bg.ac.rs 2 University of Belgrade Faculty of Mining and Geology, Djusin 7, Belgrade, radojica.lapcevic@rgf.bg.ac.rs 3 University of Belgrade ...
    ... Merdare, Zbornik radova - CD (Book of papers - Srpski kongres o putevima, Beograd, str. 12-23. [6] ; ; J (2019). Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia Proceedings of the XVII European Conference of Soil Mechanics and Geotechnical Engineering ECSMGE-2019 ...

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... development of natural gas sector based of historical trends and Action plan [5] are used as example of model analysis. These scenarios are than modified in sense of determination of energy security and assessment of the highest level of 2 environmental acceptability. Comparison of anticipate emissions ...
    ... change of load, downtime, etc.), which causes an increase in emissions. It is characteristic of the thermal power plants that the primary process of such plants is the combustion of fossil fuels for the production of thermal energy, and very careful consideration is given to the modes of operation ...
    ... d that the emission of CO2 and other pollutants, with investment costs being indispensable partial indicators of observation. The aspect of social indicators, with partial indicators of social acceptability and provision of comfort, is increasingly used in the evaluation of the energy scenario ...

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... mineral composition of the source and reservoir rocks. Therefore, crude oils can significantly differ in values of source parameters, such as distribution of C27– –C29 14α(H)17α(H)20(R) regular steranes17, gammacerane and oleanane indi- ces,18–20 ratio of C26 to C25 tricyclic terpanes1 and C2917α(H)21β(H) ...
    ... identification of isomers with the biogenic 17β(H)21β(H) configuration in all samples (Fig. 3). The values of terpane maturity ratio (Table V) are in the range typical for crude oils.1 Based on distributions of terpanes in the saturated fractions of the sediments and the values of the corresponding ...
    ... dichloro- methane (4:1 volume ratio) and the NSO fractions (polar fraction, which contains nitrogen, sulphur, and oxygen compounds) with mixture of dichloromethane and methanol (1:1 volume ratio). The saturated hydrocarbons were analyzed by gas chromatography–mass spectrometry (GC–MS). A gas chromatograph ...

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • Evidence for Ladinian (Middle Triassic) platform progradation in the Gyulakeszi area, Tapolca Basin, Western Hungary: Microfacies Analysis and Biostratigraphy

    Zsolt Robert Nagy, Nevenka Đerić, Sándor Kovács, Anna Oravecz-Scheffer, Felicitász Velledits, Olga Piros, Gabor Csillag (2014)
    anizik, ladin, karbonati, litostratigrafija, biostratigrafija, konodonti, radiolarije, dijageneza
    ... The 176 Nagy Z.R. & al. early lithification and cementation of the platform com- ponents was most likely significant since the lack of primary platform framework formed by organisms. De- spite the large amount of early cement, the significant porosity left in the limestone was filled by cavi ...
    ... le amount of scientific iterature published on the geology of the Middle Trias- 1 ShellExploration and Production Company, 150 N. Dairy Ashford Rd, Houston, Texas 77041, U.S.A. E-mail: zsolt.nagy(o'shell.com. 2 | Department of Paleontology, Faculty of Mining and Geology, University of Belgrade, ...
    ... out of five samples (Fig. 3) and most of the identified species are illustrated in Figure 6. Only one of the samples had very diverse fauna, some of which have also been described from the classic Mid- dle Triassic secttons (Buchenstein and Fired forma- tions, Fig. 2) at Fels66ors and Kovesk4l ...

  • Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia

    Jelka Krušić , Biljana Abolmasov, Miloš Marjanović (2021)
    The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...
    tecišta, zadržavanje nanosa, RAMMS, validacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... Sci. 2021, 11, 2691 3 of 24 Figure 1. (a) Main tectonic units of the Alpine Fold Belt and Alpine–Carpathian–Dinaric Mountains (modified after [28]); (b) Geological map of the Vojvodina part of the Pannonian basin basement (modified after [29]). Appl. Sci. 2021, 11, 2691 4 of 24 Figure 2. Proposed ...
    ... site belong to the carbonated type, and this confirmed that the primary geothermal reservoir was formed in the Triassic rocks of the basin bedrock (Figure 9). Appl. Sci. 2021, 11, 2691 13 of 24 Table 5. Physical-chemical features of geothermal waters on the site of Ljuba. T Conductivity pH Na K Ca ...
    ... Applying the method of D’Amore’s genetic parameters, geothermal waters at Banatsko Veliko Selo belong to the clastic water type, and this confirmed that the primary geothermal reservoir was formed within the sands of Pliocene epoch (Figure 10). Table 6. Physical-chemical features of geothermal waters ...

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... weight of water is known (y„ = 9.81 kN/m* ) as well as unit weight of solid particles (ys). The most common parameters are: dry unit weight (ya) expressed by weight-volume ratio - W„/V; porosity (n) expressed by volume ratio - V,/V and moisture content (w) expressed by weight ratio - W„/W ...
    ... inside with contacts between them dry and other way around. Therefore, only porosity between particles was analysed in this paper. For the determination of void ratio, artificially prepared samples for testing of shear strength and compressibility of municipal waste (44 samples in total) were ...
    ... 'captured” gas), porosity (m) can be analysed as secondary porosity (porosity within particles) and porosity between partcles. However, in this way 109 definition of phase composition as well as determination of mechanical properties of municipal waste is further complicated, because in ...

  • Control of substructure construction of railways in the Republic of Serbia

    Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović (2022)
    Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...
    доњи строј, техничка регулатива, насип, збијеност, контрола
    ... railway tracks and main tracks on regional railways Ev2 > 100 MN/m2, Ev2/Ev1 2.2, Evd > 45 MN/m2, Rc* for the construction and improvement of tracks on local railways and secondary tracks on all railways Ev2 > 80 MN/m2, Ev2/ > 40 MN/m2, Rc* where the ratio Ev2/ Ev1 less than the minimum value prescribed ...
    ... railways and secondary tracks on all railways Ev2 > 45 MN/m2 m2, Rc* where the ratio Ev2/ Ev1 less than the minimum value prescribed for Ev2. When creating a transition layer, the following is used: capillary rise resistant material; unbound aggregate, grain size 0/125 mm; percentage of aggregate ...
    ... dynamic deformation modulus Evd, and without determining the degree of compaction Dpr and determining the correlation coefficient between Ev2 and Evd as well as the ratio Ev2/Ev1. Also, when testing with a light drop weight, the required moisture is not checked, and testing of layers is not performed in ...

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... al indicators caused by fly ash and slag can be eliminated or reduced if they are used as build- ing material for road construction and other trafficked areas. The using of fly ash and slag as secondary materials for road construc- tions, saves huge amounts of standard building materials (stone ...
    ... R., RADIĆ, D., OBRADOVIĆ, M. & STOJANOVIĆ, K. (2015): Reprint of „Petrological and or- ganic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index”.– International Journal of Coal Geo- logy, 157, 165–183. ŽIVOTIĆ, D., STOJANOVIĆ, K., GRŽETIĆ ...
    ... (1973): Methods of analysis of coal and coke – Determination of barium oxide (BaO) in ash from solid fuels. SRPS B.H8.362 (1973): Methods of analysis of coal and coke – Determination of ferric oxide (Fe2O3) in ash from solid fuels. SRPS B.H8.363 (1973): Methods of analysis of coal and coke – Determination ...

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... determined. Index is the simplest form, basically just a list of terms, usually arranged in alphabetical order. Glossaries, which are on the next level of the spectrum, are lists of terms with definitions, and they can be monolingual, bilingual or multilingual. In the case of a bilingual or ...
    ... those concepts and simple reasoning about a certain domain RudOnto Strong semantic description Weak semantic description Thesaurus A taxonomy expanded to include additional semantic relationships Index a list of terms specific to a certain field Glossary an index containing d ...
    ... process, and it is included in the blended learning approach at the Faculty of Mining and Geology through an export of its subsets to the Moodle e-learning environment. This paper gives an outline of RudOnto, details about Moodle implementation on the Faculty of Mining and Geology, and describes ...

  • Development of terminological resources for expert knowledge: a case study in mining

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Aleksandar Cvjetić (2015)

  • Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings

    Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić (2018)
    ... models 1, 2 and 3, based on experimental data, we have obtained equations, which make possible to determine the oscillation velocities of the rock mass v depending on the reduced distance R. To assess the degree of connection between v and R, we have used the curved line dependency index ρ [14,15]. ...
    ... detonation of explosive materials is followed by release of a large amount of energy. Whereby, a greater part of energy is used for rock destruction, and part of energy, in the form of seismic wave, is lost in the rock mass causing rock mass oscillation. Investigations of the character and behavior of the pattern ...
    ... Parameters through the Application of Quotient of Products of the Same Number of Reduced Distances and Oscillation Velocities According to this model, determination of the parameter n is based on the quotient of the product of equal number of experimental data of the rock mass oscillation velocity v ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... developed within a project funded by the European Executive Agency Education, Audiovisual and Culture (EACEA) in Brussels. Its primary target are universities and enterprises of the Western Balkans (WB), and accordingly educational materials will be published in WB languages, which belong to "small" ...
    ... improvement and enhancement of relations between the academia and the enterprises and integration of creative research potential with industry and academic institutions. The second objective within our project is to develop and implement guidelines and procedures for quality assurance of OER in WB ...
    ... potential of wordnets stems from the interlingual index (ILI), which establishes relations between synsets representing the same concept in different languages (Krstev et al., 2004). Finally, among lexical resources within LSS are terminological resources such as GeolISS term and RudOnto (Stanković ...

  • Prognozna ocena resursa kaolinitskih glina u sedimentnim basenima Srbije

    Vladimir M. Simić (2003)
    Kaolinitske gline predstavljaju jednu od privredno najznačajnijih nemetaličnih mineralnih sirovina u Srbiji. Ležišta tih glina odavno se istražuju i eksploatišu u Aranđelovačkom i Kolubarskom basenu i basenima vlašićkog antiklinorijuma. Osim toga, u većem ili manjem obimu istražene su mnoge lokalnosti, a na nekima od njih vršila se povremena eksploatacija. Dosadašnja istraživanja kaolinitskih glina imala su, međutim, prevashodno uzak istraživački cilj - utvrđivanje rezervi glina određenog ležišta, dok su istraživanja regionalnog karaktera bila malog obima i vezana za delove pojedinih ...
    prognozna ocena, resursi kaolinitskih glina, sedimentni baseni, Srbija, geologija, mineralogija, kvalitet, potencijalnost

  • Some models for determination of parameters of the soil oscillation law during blasting operations

    Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić (2018)
    ... velocities of the rock mass v depending on the reduced distance R. In order to assess the degree of connection between v and R, we have used the curved line dependency index ρ [9]. The evaluation of the relationship degree of two variables [5] to values of the curved line dependency index ρ is given ...
    ... Equation of Rock Mass Oscillation—First Mode The equation of Sadovskii has been derived from the condition that if the radius of charge and the distance from the blast site to the monitoring point increase in the same, or approximately the same ratio, the soil oscillation velocity remains the same [3], i.e ...
    ... 10 of 15 Based on the data in Table 2, a statistical analysis was carried out and the following values were obtained: ‚ For model 1: The curved line dependency index ρ1 between the reduced distance R and soil oscillation velocity v is: ρ1 = 0.9880 (there is a strong correlation between R and v, given ...