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Упит dcterms_subject_txt:the house of algebraic integer

2828 items

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... From the point of view of achieving national goals, the level of recycling increases and obtains the necessary raw material for the work of the recycling industry. The mass and volume of the final disposed municipal waste are reduced, and therefore the operating costs. From the aspect of local ...
    ... „Prelici“ used by the city of Cacak (Serbia). The existing landfill has existed as a dump since 1973, and then it has been placed out of the city area. However, by the urbanization of the city and especially by the expansion of the industrial zone, landfill has become the integral part of the inhabited ...
    ... waters in the terrain), as well as by the occasional rise in the groundwater level. Figure 3. Characteristic geotechnical cross sections of the terrain at the location of the transfer station In the central part of the landfill itself, which is outside the planned construction zone of the transfer ...

  • 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
    ... railways, the installation of a protective layer is mandatory. The surface of the protective layer meets the conditions [3:3-4] flatness of the s the maximum deviation of the elevation from the projected one is ± 10 mm; the minimum thickness of the protective layer is 20 cm, and in the case of thickness ...
    ... soil under the embankment and soil control on 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/ ...
    ... capacity of the material. The foundation soil planum must meet the geometric requirements [3:6-6]: flatness of the soil material layer 30 mm/4 m; flatness of the stone material layer 50 mm/4 m; the maximum allowed deviation of the elevation of the planum of the foundation soil from the projected ...

  • 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
    ... parallel until the hydrostatic state was reached for the set value of the sample of the confining pressure. During the test, the axial loads of the sample to achieve the hydrostatic state were: 11.5; 22.9; 34.4; 45.8; 68.7 kN. After reaching the hydrostatic state, a further increase in the axial load was ...
    ... to ASTM [17], the diameter of the specimen must not be less than 47 mm (ASTM) with a height to diameter ratio of 2–2.5:1, and the duration of the experiment should be 2–15 min. ISRM [18] suggested that the diameter of the specimen should not be less than 54 mm (ISRM), while the ratio of height and diameter ...
    ... defined according to the recommendations given by Hoek and Brown [20], where the values for the range of confining pressure are 0< σ3 < 0.5σci. During the test, the specimen first led to the hydrostatic stress state, i.e., with the increase in the confining pressure, the axial load of the sample increased ...

  • 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

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the extended area of Kikinda. The impact of the industrial water sources on the regime of the public water supply source will also be assessed. The radius of influence of the groundwater ...
    ... providing the required amount of quality groundwater to meet the water demand of the population. The study area is situated in the southern part of the Pannonian Basin, which is a lowland that occupies the north of Serbia (Figure 1). The City of Kikinda extends over an area of 13.5 km2 in the spacious ...
    ... (east of the study area). It is also recharged from surface water in the southwestern part of the area, where the depth of the layers which from the aquifer is relatively small and allows a hydraulic contact between the river and the aquifer over the alluvial layers. The main types of aquifer ...

  • 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 ...
    ... Matović Jelena Maletaškić Vladimir V. Srdić 7 Conference of The Serbian Society for Ceramic Materials Programme and Book of Abstracts of The Seventh Conference of The Serbian Society for Ceramic Materials publishes abstracts from the field of ceramics, which are presented at international Conference ...
    ... Conference of The Serbian Society for Ceramic Materials The Serbian Society for Ceramic Materials Institute for Multidisciplinary Research, University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials ...

  • 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
    ... choice m #i.i| ii J5] Fig. 1. The applied procedure of municipal waste classification. The main objective of this methodology is to increase the accuracy and comparablility of data related to the characteristics, 1.e. the amount of municipal waste at the European level. It is proposed that ...
    ... weight parts of separated components is expressed in the following form: (4) where: ydi- dry unit weight of ih component W.- dry weight of 1 component W.- dry weight of all components n- total number of separated components When the waste is under the influence of water, the unit weight ...
    ... 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 and volume of individual ...

  • Development Of The Serbian Geological Resources Portal

    Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić (2011)
    ... resources of Serbia with the evaluation of potential 2010-2012, MILADINOVIĆ, Z. 10 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 ...
    ... 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 ...
    ... signature of the discipline, abstract of the paper, key words and paper description, with weight factors 4, 2, 3, 1, res- pectively. If the keyword “gold” is entered, the method on the server sums up the number of appear- ances of the word “gold” in the abovementioned fields in relation to the given factor ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... desktop computers (Figure 1). The main page of the cadastre of abandoned mines of Vojvodina shows the application home page, where the central, and the largest part of the screen displays a map of the abandoned mines. The base layer can optionally be either from one of the OpenStreetMap [8,9] or ArcGis ...
    ... vulnerability of groundwater. The source for assessing the vulnerability of groundwater was the map of groundwater vulnerability of Serbia [14], that integrates a number of factors: the slope of the terrain and its impact on infiltration, type of soil and vegetation cover, the thickness of the superficial ...
    ... (centralization) of all information about archaeological sites with the cadastre of abandoned mines on the territory of AP Vojvodina could be essential for the future strategic planning of the geological and archaeological exploration of this area. Under the framework of the IPA Program (The Instrument ...

  • 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 ...
    ... Matović Jelena Maletaškić Vladimir V. Srdić 7 Conference of The Serbian Society for Ceramic Materials Programme and Book of Abstracts of The Seventh Conference of The Serbian Society for Ceramic Materials publishes abstracts from the field of ceramics, which are presented at international Conference ...
    ... Conference of The Serbian Society for Ceramic Materials The Serbian Society for Ceramic Materials Institute for Multidisciplinary Research, University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials ...

  • The state and perspective of the natural gas sector in Serbia

    Dejan Ivezić, Marija Živković, Dušan Danilović, Aleksandar Madžarević, Miloš Tanasijević (2016)
    The strategy of long-term energy development of Serbia identifies an increase of share of natural gas in final energy consumption as one of the main aims. Serbia has signed a strategic agreement with the Russian Federation on cooperation in the oil and gas sector, within which the project South Stream pipeline is planned to be realized. In addition, the Republic of Serbia has signed the Treaty that establishes the Energy Community and accepted the obligation to implement the Energy ...
    Consumption, natural gas, scenarios of development

  • 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
    ... liebeana (GEINITZ) from the Kostadinovica section. Arrows point in the direction of the movement of the trace producing animal. Labels in the lower right corners designate their beds within the section (see Fig. 3). (a) Bedding plane view of the trace. (b) View of the basal burrow and the crest. (c) Basal ...
    ... in- dicate the presence of hyperpycnites within the turbidites of the Kučaj-Zvonce flysch. The characteristics of the Kučaj-Zvonce flysch were studied at the Kostadinovica quarry in which 31.75 m of the siliciclastic succession is exposed. Analyzed sedimentary features were used for the determination ...
    ... Mississip- pian floras of Europe. Based on the studied sedimentary features and the position and mode of preservation of the palaeontological material, the Ko- stadinovica succession is interpreted as an distal part of the tur- bidite system with the occurrence of hyperpycnites. The detailed discrimination ...

  • 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
    ... ash, the type of additive (hydrated lime or cement), the percentage of the additive and partly of the time of exposure. Fig. 7 presents the trend of calcite formed in the samples of mixtures based on intensity (in the registered pulses in the diffractogram) of the reference peak (at 29,5° 2θ) for ...
    ... 3.5.3 The modulus of elasticity After 7 days of the sample storage in the wet chamber, the modulus of elasticity was tested and was in range from 58.000 to 289.000 kPa. The maximum modulus of elasticity is obtained by adding 4 % of the cement as the binder. With the greater amount of cement ...
    ... binder have the deviation in the content of the same binder amount in percentages, and in the addition of cement as the binder the deviation results are greater than those of the lime. Table 16 The modulus of elasticity after 112 days in the wet chamber Sample No. Modulus of elasticity in compression ...

  • 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 ...
    ... prominent parts of the terrain. Planar erosion with sporadic linear erosion is present on steep slopes, and products of these processes are deposited at the bottom of the slopes and on the flat parts of the terrain. 3. GEOTECHNICAL ZONING OF THE TERRAIN 3.1. Zoning of the terrain according ...
    ... Zoning of the terrain; 1 INTRODUCTION The highway E-80 (SEETO route 7), represents the traffic intersection of the Western Balkan and is part of the main regional transport network in Southeast Europe. Total length of the route is 77 km, and it is divided into two sections: the first ...
    ... 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. Compared to the total length of the first section, about ...

  • 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
    ... declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results. References 1. Strategy Energy Development of the Republic of Serbia until 2015. Available ...
    ... temperature of 479.5 ◦C. Comparison of the results from Figure 1a,b indicates that the intense decomposition of selected lignite and HDPE takes place in the same temperature range, from 400 to 500 ◦C, which was thus chosen for the study of the synergetic effect. In the DSC curve of the lignite/HDPE ...
    ... s, see the legends of Tables 1 and 2. The compositions of individual hydrocarbons in the aliphatic and the aromatic frac- tions of liquid lignite/HDPE co-pyrolysis product at 500 ◦C are similar to those of higher rank coal and crude oils of terrestrial origin. The main difference between the composi- ...

  • 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
    ... located in the Southern Region of Serbia. The extraction of the urban area was carried out using the CORINE Land Cover Open Data – the product of the visual interpretation of high-resolution satellite imagery. According to the ASR calculation, the maximum irradiation for a selected part of the urban ...
    ... Greece For the optimal use of solar panels, the morphology of the terrain is also crucial. The variability of morphological factors, such as altıitude, slope, and aspect, affects the length of direct solar radiation. In „addition, the morphology also affects the level of shading of the area, which ...
    ... Overview of The Solar Analyst Tool The Solar Analyst Tool (SAT) allows the analysis of the effects of solar radiation. The algorithm which is implemented in the SAT is developed and later upgraded by the authors — Paul Rich and Pinde Fu (1999). As the authors of the SAT point out, the calculation ...

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... at the start of testing. The difference in readings represented the variation in length of the tested sample, while shrinkage of the cement mortar was expressed as the ratio of length variation and the initial length of the sample at the start of testing. Mortar shrinkage εsm,i was calculated according ...
    ... volume of the cement paste shrinking during hardening. The replacement of cement with waste material had the effect of reducing the adhesion of the mortar to the concrete substrate. With an increase in the percentage of cement replacement, the adhesive strength decreased, with a decrease of 6–47% (Figure ...
    ... meet the prescribed conditions in terms of its characteristics, could be used as a replacement for cement. Namely, the results showed that the lack of slag in terms of the content of SiO2, Al2O3, Fe2O3, and unburned carbon, and the loss of ignition, may be overcome by the thermal treatment of the slag ...

  • 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
    ... on the type of energy source. At the same time, through the mentioned partial indicators, one can see the reduction or increase of emissions at the national as well as the sector level, the proportions of the use of renewable sources, as well as the energy intensity by sectors, reduction of energy ...
    ... primarily on the type of energy used and the sector used, which causes the combustion regime, the existence of filters, etc. The emission factors of the solid particles and the unit of energy produced are shown in Table 4. The use of energy sources (low efficiency devices, without modern measurement ...
    ... 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 of the plant, equipment and adequacy of equipment, as well as regular maintenance of it. 5 Table 4. The emission factors of the ...