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Упит dcterms_subject_txt:diagnostics of operating coditions,Random Forest

2856 items

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... FACULTY OF MINING AND GEOLOGY. The main mining project for under- ground mining of bauxite reserves remainingin the deposit "Podbracan". Belgrade: 2008. [In Serbian] THE GOVERNMENT OF THE REPUBLIC OF SERBIA. Rulebook on the method for executing of mine surveying. Of�cialGazette of the Republic of Serbia ...
    ... during the pre-project and project stage of mining, as well as during the construction of mining facilities and excavation of mineral resources. Speci�c features of the project concerning excavation of the remaining reserves of bauxite in the deposit of "Podbracan", and in this way the forthcoming mining ...
    ... slopes of the Javor and Susica mountains in the territory of the municipality Milici – Bosnia and Herzegovina (The Republic of Srpska). The ore reserves of the bauxite deposit of "Podbracan" were excavated till 2010 by using the open pit method of mining at the central and northern part of the deposit ...

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • 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
    ... basaric@rgf.bg.ac.rs CONTROL OF SUBSTRUCTURE CONSTRUCTION OF RAILWAYS IN THE REPUBLIC OF SERBIA Abstract Control of compaction of natural soil (in excavation) or compacted in the embankment during the construction of roads is one of the basic forms of quality control of the substructure. When building ...
    ... the part of the railway trunk in the cut. 2.1. INSTRUCTION 338 Table 1.Required values of compaction and degree of unevenness [1:12-12] Type of Planum of the railway /on top of the protective layer / Planum of the railway /on top of the transition layer/ railways Rc* Ev2 N/mm2 Degree of unevenness ...
    ... Control of substructure construction of railways in the Republic of Serbia Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Control of substructure construction of railways in the Republic of Serbia | ...

  • 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
    ... 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 ...
    ... 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 is available at: www.dr.rgf.bg.ac.rs minerals Article Determination of Mechanical Properties of Altered Dacite ...

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi – criteria optimization

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    višekriterijumska optimizacija, definisanje kriterijuma, podzemna eksploatacija

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... I), University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions "CEXTREME LAB” - Institute of Nuclear Sciences "Vinča”, University of Belgrade Faculty of Mechanical Engineering ...
    ... Institute of Nuclear Sciences *Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence for Green Technologies, Institute for Multidisciplinary Research, University of Belgrade Faculty of Technology and Metallurgy, University of Belgrade ...
    ... University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions “ĆCEXTREME LAB” – Institute of Nuclear Sciences “Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence ...

  • 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
    ... (excavation of exploration pit at the landfili with measurement of volume and weight of excavated waste), measurements on samples from exploration boreholes, geodetic surveying of geometry and calculation of landfill volume with knowing the mass of disposed waste, nuclear methods, measuring of mass ...
    ... soil, determination of physical parameters of municipal waste is more complex, because of its extremely heterogeneous composition, consistency, biodegradability etc. In addition, physical properties of waste change over time, so the method of taking and selection of representative samples is problematic ...
    ... determination of municipal waste unit weight. Those assumptions are: knowledge of waste composition, percentage of ecarth overlay, moisture, method and degree of compaction, waste age etc. (Rakić et al..2016). Due to similarity of municipal waste and soil, for the determination of unit weighh ...

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)
    ... Projects funded by MEMSP. FMG: Geological bibliography of the Republic of Serbia the ranking of search results, based of the number of appearances of a key word or phrase, and the sum of weigh factors of the search field. Namely, a number of entities and their attributes within the database corre- ...
    ... visualization of geologi- cal data. The development and implementation of GeolISS is managed by a team from the Faculty of Mining and Geology at the University of Belgrade (FMG) and funded by the Ministry of the Environment, Mining and Spatial Planning (MEMSP). The main goal of the implementation of GeolISS ...
    ... geodiversity of North-Western Serbia. 9 The project was funded by MEMSP, Geologic Institute of Serbia: Geo-heritage and geo-diversity of North-Western Serbia 2007-2011, FILIPOVIĆ, I. & JOVANOVIĆ, D. 2011. FMG: Synthesis of geological research of jewelry mineral resources of Serbia with the evaluation of potential ...

  • Influence of Ag doping on the morphological and magnetic properties in CuO nanopowders

    Maria Čebela, Uroš Čakar, Vesna Lojpur, Maja Milošević, Sanja Krstić, Vladimir Dodevski, Milena Rosić (2023)
    ... I), University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions "CEXTREME LAB” - Institute of Nuclear Sciences "Vinča”, University of Belgrade Faculty of Mechanical Engineering ...
    ... Institute of Nuclear Sciences *Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence for Green Technologies, Institute for Multidisciplinary Research, University of Belgrade Faculty of Technology and Metallurgy, University of Belgrade ...
    ... University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions “ĆCEXTREME LAB” – Institute of Nuclear Sciences “Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence ...

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... at an angle of 40 to 50°. Varia- tions of the dip directions of bedding planes and their dip angles are due to the deformed state of the whole unit. Deformational fabrics are composed of a series of cleavages which significantly disrupt the primary sedimentary structures. Development of seve- ral ...
    ... modes of transport was limited by the insufficient quantity of the obtained sedimentological samples. This led to the use of fossils as an in- dicator of hyperpycnal transport. The presented study could be used as a starting point for a more detailed petrological analysis of the provenance of the ...
    ... section was used for the construc- tion of a local sedimentological column (Fig. 3). 3.1. Unit A (interval: 0 to 2.10 m of the column) Stratigraphically the lowest unit (A) of the succession is exposed in the NE side of the quarry and is composed of a series of nor- mally graded turbidites (Fig. 4) ...

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... - the modulus of elasticity. The aim of research is to test the possibility of using the fly ash from PPNT A for making elements of road structures (top and bottom layers of the road). 2 Experimental 2.1 Mineral properties of fly ash Mineral properties of samples of fly ash from thermal ...
    ... the addition of a binder hydrated lime and cement. Tests were performed after 7 and 28 days in a humid environment with different amounts of extra binder: - samples without the addition of binders, - a sample with the addition of 2 % of binder, - a sample with the addition of 4 % of binder, - ...
    ... the field of small- angle 2θ (8 ÷ 15°) and 29 ÷ 30° 2θ. Namely, in the area of small angles, a series of insufficiently defined peaks of very low intensity, which indicate the beginning of crystallization of new phases, according to the data could match the compounds from the group of hydrated Ca ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... mass proportion of C + 84.9 × (mass proportion of H − mass proportion of O/8)— 0.62 [53]; Qn2 = 34.1 × mass proportion of C + 121.4 × mass proportion of H − 15.3 × mass proportion of O + 10.5 × mass proportion of S [53]; Qn3 = 33.9 × mass proportion of C + 121.5 × mass proportion of H − 12.7 × mass ...
    ... proportion of O + 9.3 × mass proportion of S [53]; Qn4 = 33.4 × mass proportion of C + 117.7 × mass proportion of H − 15.6 × mass proportion of O [54]; Qn5 = 33.8 × mass proportion of C + 122.3 × (mass proportion of H − mass proportion of O/8) + 9.4 × mass proportion of S [55]; Qg—gross calorific value; ...
    ... than pyrolysis of lignite of better quality (64.35% of carbon, dry basis, and net calorific value of 25.78 MJ/kg) at 600 ◦C [16]. The yields of liquid and gaseous products of lignite/HDPE co-pyrolysis at 500 ◦C are also higher than the yields of these products obtained by mild liquefaction of lignite (t ...

  • Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7

    Dragoslav Rakić, Zoran Berisavljević, Irena Basarić, Snežana Bogdanović, Jovana Janković (2019)
    Part of E-80 highway that passes through Serbia (from the city of Nis to the administrative border Merdare) is 77 km long. The highway is divided into two sections: the first from Nis to Plocnik (39.4 km long) and the second from Plocnik to the administrative border with Kosovo. The route is designed through a typical plain and hilly terrain in which different geological units are dominant: crystalline schists, neogene sediments of foothills and quaternary sediments in the valley ...
    ... on of design parameters of seismicity for structures, forming of engineering geological map of limitations. 2 ENGINEERING GEOLOGICAL CONDITIONS IN THE ZONE OF HIGHWAY ROUTE Regional rupture pattern indicates two systems of perpendicular structures that form a block structure of investigated ...
    ... embankments height of 0.5 to 1.5 m (locally, in the case of bridges approaches, embankments of higher heights are designed). The groundwater level is at depth over 5.0 m, and only in the zones of smaller streams is at depth of about 2.0 m. In geotechnical sense, most of the route is estimated ...
    ... Due to the construction of larger number of bridges, and because this section is built of solid rock masses, most of the section is characterized as favourable - A (around 70%), and 27% as conditionally favourable – B. Due to the height of embankments and use of geosynthetics for their ...

  • 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
    ... Serbia Potentials of Renewable Energy Sources (RES) of the Republic of Serbia are significant and estimated at 5.65 Mtoe (Million tonnes of oil equivalent) per annum (Republic of Serbia, 2016). The largest part of the current usage of the RES refers to a traditional way of using biomass and ...
    ... The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje Boban PAVLOVIĆ ! Junior researcher, Faculty of Mining and Geology, University of Belgrade Milica PEŠIĆ-GEORGIADIS Teaching assistant, Faculty of Mining and Geology, University of Belgrade ! ...
    ... estimated for the reason that the exact value of the output electricity depends on a large number of factors (type of PV cells, temperature of PV cells, effect of dust on PV cells, losses in the inverter, 337 etc.). For the purpose of the estimation of the annual electricity production generated ...

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... same for both approaches of determining the degree of anisotropy. The existence of that high similarity clearly indicates that it is an isotropic medium. During modelling of the anisotropic rock masses, knowing of the quantitative indicators of anisotropy would be of great use for creating reliable ...
    ... indicators of anisotropy: anisotropy coefficient K and degree of anisotropy D. The following section provides a detailed description of the concept of calculation and formulas. There are several ways to determine the degree of anisotropy and anisotropy coefficient. Our investigation of the degree ...
    ... calculation of degree of anisotropy is divided into two parts. First part is referred to determination degree of anisotropy for each special sample. The second part shows determination degree of anisotropy for each special direction. The next part of calculation process describes investigation of anisotropy ...

  • 3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia

    Saša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac (2013)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change